JP7705307B2 - Detachment prevention device and its claw member - Google Patents

Description

The present invention relates to a device for preventing detachment that has a storage recess formed with an opening facing the inner circumferential direction on the receiving side of the insertion tube, and a claw member that is tiltably stored in the storage recess, and the claw member.

A conventional separation prevention device is a separate member that is formed in an arc shape along the circumferential direction of the insertion part of the insertion tube and includes a locking part that locks with the outer circumferential surface of the insertion part, and a storage recess that opens toward the outer circumferential surface of the insertion part and stores the locking part inside. When the locking part is pressed against the inner bottom surface of the storage recess, it bites into the outer circumferential surface of the insertion part, preventing the two tubes from moving relative to each other.

In this type of detachment prevention device, a locking portion (claw member) having a claw that locks with the outer circumferential surface of the insertion portion abuts against the inner wall of the storage recess and tilts, and the claw bites into the outer circumferential surface of the insertion portion, preventing movement in both axial directions (see, for example, Patent Document 1).

JP 2010-242798 A (page 6, FIG. 4)

In the device for preventing disengagement described in Patent Document 1, when the insertion tube tries to come out relative to the receiving side, the claw member that engages with the outer circumferential surface of the insertion tube tilts in the storage recess formed on the receiving side, but one side wall of the claw member hits the support wall of the storage recess, preventing further tilting, and the claws of the claw member bite strongly into the insertion tube, preventing the insertion tube from coming out. However, since the claw member is formed in an arc shape along the circumferential direction of the insertion tube so that it can bite into the outer circumferential part of the insertion tube, when the claw member tilts with the movement of the insertion tube, it is the circumferential ends of the side wall of the claw member that first hit the support wall of the storage recess, and stress is concentrated on the circumferential ends of the side wall of the claw member, and stress is also concentrated in the parts corresponding to the circumferential ends of the support wall of the opposing storage recess, which may damage the claw member or the storage recess.

The present invention was made with an eye on these problems, and aims to provide a device for preventing the insertion tube from slipping out of the receiving port without damaging the claw member or the storage recess, and the claw member.

In order to solve the above problems, the separation prevention device of the present invention is
A detachment prevention device having a storage recess formed on the receiving side of an insertion tube and facing inwardly, and a claw member tiltably stored in the storage recess,
A support wall extends circumferentially within the storage recess for supporting and tilting one side wall of the claw member, and the side wall or the support wall of the claw member has a recess formed on the circumferential end side.
According to this feature, as the insertion tube moves, the claw member in the storage recess starts to tilt relative to the support wall from the moment it stops, and the side walls of the claw member and the support wall of the storage recess avoid contact at the ends as much as possible due to the recess, and the claw member is supported for a longer period at the circumferential center, thereby preventing damage due to stress concentration at both ends between the side walls of the claw member and the support wall of the storage recess.

The recess is characterized in that it is formed deeper toward the circumferential end.
According to this feature, the abutment of both ends of the side wall of the claw member and the support wall of the storage recess can be delayed, thereby preventing damage due to stress concentration at both circumferential ends of the side wall of the claw member and the support wall of the storage recess.

The recess is characterized in that it is formed in a tapered shape.
According to this feature, the recess is formed with a tapered surface, which makes the manufacturing process easy.

The recesses are characterized in that they are formed on both circumferential end sides.
According to this feature, as long as recesses are formed at least on both circumferential end sides, the circumferential end portions of the side wall of the claw member and the support wall of the storage recess will not come into contact initially, thereby preventing damage due to stress concentration at both circumferential end portions of the side wall of the claw member and the support wall of the storage recess.

The recess is characterized in that it is formed on the inner diameter side of the side wall of the claw member or on the inner diameter side of the support wall.
According to this feature, the recess functions only when the claw member is tilted.

A claw member is tiltably accommodated in a storage recess formed on the receiving side of the insertion tube and facing inwardly,
At least one side wall of the claw member has a recess formed on a circumferential end side.
According to this feature, as the insertion tube moves, the claw member in the storage recess starts to tilt relative to the support wall from the moment it stops, and the side walls of the claw member and the support wall of the storage recess avoid contact at the ends as much as possible due to the recess, and the claw member is supported for a longer period at the circumferential center, thereby preventing damage due to stress concentration at both ends between the side walls of the claw member and the support wall of the storage recess.

The recess is characterized in that it is formed on the rear side of a locking claw formed on the claw member.
According to this feature, a recess is formed on the side opposite the locking claw, making it easier to tilt the claw member and allowing the locking claw to bite deeply into the insertion tube.

FIG. 2 is a plan view showing an installation state of a fluid pipe in an embodiment of the present invention. 1A is a partial cross-sectional view showing a device for preventing separation of a fluid pipe, and FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A is a front view of a conventional claw member in the first embodiment, FIG. 1B is a bottom view, and FIG. 1C is a cross-sectional view taken along the line HH of FIG. 2A is a cross-sectional view taken along line DD of FIG. 2A, FIG. 2B is a cross-sectional view taken along line II of FIG. 2A, and FIG. 13 is a modified example of the storage recess in the first embodiment. 2(b) is a cross-sectional view taken along line B-B of FIG. 2(b) of the storage recess of the present invention in Example 1 and a conventional claw member, where (a) is an enlarged view before the claw member is pushed in by the bolt, (b) is an enlarged view of the state in which the claw member has been pushed in by the bolt and is in contact with the insertion tube (an enlarged view of the area E enclosed by the dotted line in FIG. 2(a)), and (c) to (e) are enlarged views showing the tilting state of the claw member over time. 2(b) is a cross-sectional view taken along line G-G of FIG. 2(b) of the storage recess of the present invention in Example 1 and a conventional claw member, in which (a) is an enlarged view before the claw member is pushed in by the bolt, (b) is an enlarged view of the state in which the claw member is pushed in by the bolt and comes into contact with the insertion tube, and (c) to (e) are enlarged views showing the tilting state of the claw member over time. 5A to 5D are explanatory views showing the movement of the storage recess and the claw member in the first embodiment as viewed from the radial direction of the tube axis, and show the tilting state of the claw member over time. 11A to 11D are reference diagrams showing the movement of the storage recess and the claw member in a conventional type viewed from the radial direction of the tube axis, and show the tilting state of the claw member over time. 5A to 5E are explanatory views of a claw member of the present invention in Example 2, where (a) is a perspective view, (b) is a front view, (c) is a bottom view, (d) is an L-L cross-sectional view, and (e) is an M-M cross-sectional view. 13 is a modified example of the claw member in the second embodiment. 2(b) is a cross-sectional view taken along line G-G of FIG. 2(b) of a conventional storage recess in Example 2 and the claw member of the present invention, in which (a) is an enlarged view before the claw member is pushed in by the bolt, (b) is an enlarged view of the state in which the claw member is pushed in by the bolt and comes into contact with the insertion tube, and (c) to (e) are enlarged views showing the tilting state of the claw member over time. 5A to 5D are partial cross-sectional views showing a claw member of Modification 1, and show tilting states of the claw member over time. 10A to 10D are partial cross-sectional views showing a claw member of Modification 2, and show the tilting state of the claw member over time. FIG. 11 is a partial cross-sectional view showing a separation prevention device of a modified example 3. FIG. 13 is a partial cross-sectional view showing a separation prevention device of a modified example 4. FIG. 13 is a partial cross-sectional view showing a separation prevention device of modified example 5.

The following describes the embodiment of the anti-detachment device and its claw member according to the present invention.

The separation prevention device according to the first embodiment will be described with reference to Figs. 1 to 9. As shown in Figs. 1 and 2(a), the fluid pipe in the present invention is a pipe for a water supply buried underground, and is configured with a connection point where a receiving portion 5 of a water pipe 2 (curved pipe) as a receiving pipe is watertightly connected to an insertion portion 12 formed at the end of a water pipe 11 (straight pipe) as an insertion pipe. In addition, a gas pipe 4 is installed adjacent to the fluid pipe.

The fluid pipe of this embodiment is designed so that clean water flows down inside the pipe in the direction of the outlined arrow in Figure 1. The water pipe 2 also has a bent section 3 that bends in a predetermined manner along the pipe axis C. In such a bent section 3 or straight section, uneven forces due to the water pressure or water flow of the internal fluid of the fluid pipe, or unpredictable external forces due to earthquakes, etc., may act, causing, for example, the connection between the receiving section 5 and the insertion section 12 to come loose, causing the internal fluid to leak, or the fluid pipe to move and come into contact with, for example, an adjacent gas pipe 4.

As shown in Figures 1 and 2, the water pipes 2 and 11 are made of, for example, ductile cast iron for use in water supply and buried underground, and the inner circumferential surface of the pipe is covered with a mortar layer. The upper half of Figure 2(b) shows a cross section of a portion extending at an angle from the central axis to the diameter direction of the separation prevention device 15 shown in Figure 2(a).

The fluid pipe according to the present invention may be made of metals other than ductile iron, such as steel, or may be made of concrete, polyvinyl chloride, polyethylene, or polyolefin. Furthermore, the inner surface of the fluid pipe is not limited to a mortar layer, and may be coated with, for example, an epoxy resin layer, plating, or the like, or the inner surface of the fluid pipe may be coated with an appropriate material by powder coating.

In addition, in this embodiment, the fluid in the fluid pipe is not limited to drinking water, but may be, for example, industrial water, agricultural water, sewage, or other liquids other than water, or may be gas or a gas-liquid mixture of gas and liquid. Note that the installation mode of the fluid pipe shown in Figure 1 is merely one example, and the separation prevention device of the present invention can be applied to various installation modes of fluid pipes.

As shown in FIG. 2(a), the water pipe 2 serving as a receiving pipe has a receiving portion 5 having a receiving shape and a flange 5a provided at the end of the receiving portion 5. The water pipe 11 serving as an insertion pipe has an insertion portion 12 that is inserted into the receiving portion 5.

The water pipe 2 as the receiving pipe and the water pipe 11 as the insertion pipe are inserted between the inner peripheral surface of the receiving portion 5 and the outer peripheral surface of the insertion portion 12 via an annular seal material (not shown) arranged around the entire circumference. An annular pressure ring 22 made of a single or multiple divided arc-shaped members is fitted onto the outer peripheral surface of the insertion portion 12. This pressure ring 22 has a pressure portion 22a that protrudes toward the flange 5a.

The pressure ring 22 is connected to the flange 5a by fastening multiple T-head bolts and nuts 23. By bringing the pressure ring 22 and the flange 5a closer together as a result of this fastening, the sealing material (not shown) pressed by the pressing part 22a is tightly attached to the inner surface of the receiving part 5 and the outer surface of the insertion part 12, and the water pipe 2 as the receiving pipe and the water pipe 11 as the insertion pipe are connected in a hermetic manner.

As shown in FIG. 2(a), the pressure ring 22 is fixed to the water pipe 11 by the bolts 24 screwed in radially and threading them so that the claw members (not shown) arranged on the inner circumference bite into the outer circumference of the water pipe 11. The claw members (not shown) and bolts 24 of the pressure ring 22 are arranged at eight equal intervals in the circumferential direction, and the arm 15b of the detachment prevention device 15 described later is arranged on the outer diameter side.

As shown in Figures 1 and 2, the separation prevention device 15 prevents the water pipe 2 as the receiving pipe and the water pipe 11 as the insert pipe, which are connected in a sealed manner via a pressure ring 22, from coming out in the pipe axial direction, as in this embodiment, and is formed into a ring shape by arranging multiple divided bodies made of ductile cast iron in the circumferential direction and connecting them with bolts and nuts 9a and 9b.

More specifically, the detachment prevention device 15 is composed of a base 15a fixed to the water pipe 11 as the inlet pipe, and an arm 15b extending in the axial direction from the base 15a so as to straddle the press ring 22 and the flange 5a of the receiving portion 5. In this embodiment, the base 15a is formed into a ring shape by arranging two divided bodies, one above the other, in the circumferential direction and connecting them with a bolt nut 9a, and similarly, the arm 15b is formed into a ring shape by arranging two divided bodies, one above the other, in the circumferential direction and connecting them with a bolt nut 9b. Furthermore, the base 15a and the arm 15b are connected by a T-head bolt nut 17. In this embodiment, the base 15a and the arm 15b of the detachment prevention device 15 are each composed of two divided bodies, but they may be formed into a ring shape by three divided bodies or four or more divided bodies. In addition, the base 15a and the arm 15b of the detachment prevention device 15 are not limited to being separate bodies in the axial direction as in this embodiment, but may be integrally formed. In addition, the end of the arm 15b of the separation prevention device 15 in the tube axis direction is formed into a hook with an inner diameter smaller than the flange 5a of the receiving portion 5, and by abutting against the flange 5a in the circumferential direction, movement of the tube axis C in one direction (to the left in the figure) is prevented.

As shown in FIG. 2, a plurality of storage recesses 16 serving as claw chambers for inserting and fixing the claw members 200 are arranged at a predetermined distance in the circumferential direction on the inner periphery of the base 15a. In addition, a bolt 7 is screwed radially into the base 15a so as to communicate with each storage recess 16, and by screwing the bolt 7 from the outer diameter side, the claw members 200 (described later) stored in each storage recess 16 can be pressed inwardly.

As shown in FIG. 2(b), the storage recesses 16 are partitioned by partition walls 15c provided at a predetermined interval in the circumferential direction, and in this embodiment, eight storage recesses 16 are formed along the circumferential direction, and each storage recess 16 is connected to a bolt hole 6 into which a bolt 7 is screwed. In addition, a claw member 200 is fitted into each storage recess 16 in a state where it is connected to the partition wall 15c via a rubber body 18. The number of storage recesses and claw members is not limited to this embodiment, and may be any number provided along the circumferential direction of the fluid pipe.

Each claw member 200 has approximately the same shape, and is arranged in a plurality of positions around the circumferential direction of the insertion portion 12. As shown in FIG. 2(b), the claw members 200 are approximately symmetrical in the circumferential direction, and the bolt 7 presses the claw members 200 in the inward radial direction at approximately their central positions in the circumferential direction.

6(a) to 6(e), the claw member 200 is pressed toward the outer circumferential surface of the insertion portion 12 by screwing in the bolt 7, so that the locking claw 200a bites into and locks into the outer circumferential surface of the insertion portion 12, preventing movement of the water pipe 11 in the pipe axis C direction, as described below. Also, a gap K and a gap K' are formed on both the left and right sides in the pipe axis C direction of the storage recess 16 in which the claw member 200 is stored.

Furthermore, as shown in FIG. 4, a support wall 16a is formed on the outer diameter side of the inner surface of the storage recess 16 on the side where the insertion port 12 comes out, in the radial direction, i.e., in a direction approximately perpendicular to the outer circumferential surface of the insertion port 12, and a tapered surface 16b is formed on the inner diameter side of this support wall 16a as a recess that is inclined in a direction that tapers toward the opening on the insertion port 12 side.

Next, the claw member 200 in the first embodiment, which is stored in the storage recess 16 of the present invention, will be described. As shown in FIG. 3, the claw member 200 is a conventional claw member that is approximately arc-shaped when viewed from the front, and the side wall 200c that abuts against the support wall 16a of the storage recess 16 is a uniform flat surface including the circumferential center and both circumferential ends, and has a locking claw 200a that extends inward from the side wall 200d on the insertion direction side and locks with the outer circumferential surface of the insertion port 12. As will be described later, the locking claw 200a tilts in the storage recess 16 and bites into the outer circumferential surface of the insertion port 12, thereby fixing the separation prevention device 15 to the insertion port 12.

As shown in FIG. 4, the tapered surface 16b formed as a recess formed at both ends in the circumferential direction of the storage recess 16 is an inclined surface inclined at a uniform angle with respect to the support wall 16a, and as shown in FIG. 4(a), the boundary line 16c between the support wall 16a and the tapered surface 16b is formed in a substantially straight line, so that the tapered surface 16b is gradually tapered from the center side in the circumferential direction toward the end. In the embodiment shown in FIG. 4(a), the tapered surface 16b is provided continuously from one end to the other end, but as in the storage recess 16' of the modified example shown in FIG. 5, the tapered surface 16b' and the tapered surface 16b' that are spaced apart from each other may be provided only in the areas close to both ends in the circumferential direction.

Next, the operation of the claw member 200 when an external force acts on the water pipes 2, 11 will be described in order with reference to Fig. 6, which shows the storage recess 16 and the circumferential center side of the claw member 200. Fig. 6 is a cross-sectional view of the storage recess of the present invention and a conventional claw member taken along line B-B of Fig. 2(b), and Fig. 6(a) shows the state before the claw member 200 is pushed in by screwing in the bolt 7. As shown in Fig. 6(b), the claw member 200 is pressed toward the outer peripheral surface of the insertion portion 12 by screwing in the bolt 7, and under normal circumstances the locking claw 200a bites into the outer peripheral surface of the insertion portion 12 and locks in place. In this position, if an unexpected external force such as an earthquake or an uneven force due to water pressure inside the water pipe 11 occurs, as shown in FIG. 6(c), the insertion portion 12 of the water pipe 11 moves in one direction along the pipe axis C (the direction of the outlined arrow in the figure), and the claw member 200, which was engaged with the outer circumferential surface of the insertion portion 12, moves in one direction along the pipe axis C (the direction of the outlined arrow in the figure) by the amount of gap K, with its upper portion remaining in contact with the tip of the bolt 7. This movement fills the above-mentioned gap K, and a gap K" is formed on the right side of the claw member 200 in the figure.

The anti-detachment device 15 then moves a predetermined distance in one direction of the tube axis C (to the left in the figure), and the hook of the arm 15b of the anti-detachment device 15 comes into contact with the flange 5a of the socket 5. Next, as shown in FIG. 6(d), the claw member 200 moves in one direction of the tube axis C by the gap K, and its upper portion in the figure maintains contact with the tip of the bolt 7 and comes into contact with the support wall 16a of the storage recess 16, further pressing the anti-detachment device 15 in one direction of the tube axis C.

6(d) and (e), the upper portion of the claw member 200 remains in contact with the tip of the bolt 7, and the locking claw 200a of the claw member 200 tilts relative to the outer circumferential surface of the water pipe 11. In this way, the locking claw 200a of the claw member 200 locks into the insertion portion 12, and the locking claw 200a bites into the outer circumferential surface of the insertion portion 12 using the storage recess 16 in which the claw member 200 is stored as a reaction force, causing the water pipe 11 to move relatively to the left in the illustration of the pipe axis C with respect to the detachment prevention device 15. In other words, the water pipe 11 can be prevented from coming out.

In particular, as shown in FIG. 6(e), the claw member 200 tilts within the storage recess 16, utilizing the support wall 16a of the storage recess 16 and the tip of the bolt 7 to take up the reaction force, making it easier for the locking claw 200a to bite into the outer circumferential surface of the insertion portion 12, thereby reliably preventing the water pipe 11 from moving. In addition, the claw member 200 is more likely to tilt by utilizing the gap K having a predetermined length, and the locking claw 200a easily bites into the outer circumferential surface of the insertion portion 12, further enhancing the effect of preventing the water pipe 11 from moving.

Next, the operation of the claw member 200 described above will be described in order with reference to FIG. 7, which shows the storage recess 16 and the circumferential end side of the claw member 200. FIG. 7 is a cross-sectional view of the storage recess of the present invention and the conventional claw member taken along line G-G of FIG. 2(b), and FIG. 7(a), like FIG. 6(a), shows the state before the claw member 200 is pushed in by the screwing of the bolt 7. The difference from FIG. 6(a) is that the tapered surface 16b located on the inner diameter side of the support wall 16a of the storage recess 16 is formed in a gradually wider area in the radial direction as it approaches both ends in the circumferential direction from the central part side in the circumferential direction. As shown in FIG. 7(b), the claw member 200 is pressed toward the outer circumferential surface of the insertion portion 12 by the screwing of the bolt 7, and as shown in FIG. 7(c), the claw member 200 that was engaged with the outer circumferential surface of the insertion portion 12 moves by the gap K while maintaining contact with the tip of the bolt 7 as the water pipe 11 moves.

7(d) and (e), the claw member 200 tilts in the storage recess 16. If the support wall 16a of the storage recess 16 is formed of a uniform flat surface as in the conventional case, the claw member 200 is formed in an arc shape along the circumferential direction of the insertion portion 12, so that when the claw member 200 tilts with the movement of the insertion portion 12, the first to come into contact with the support wall 16a of the storage recess 16 are the circumferential ends of the side wall 200c on the side in the direction of removal of the claw member 200, and at this time, the central part in the circumferential direction separates without coming into contact with the support wall 16a (see FIG. 9(d)). Therefore, stress due to contact with the support wall 16a is concentrated on both circumferential ends of the side wall of the claw member 200, and stress is also concentrated on the abutting parts of both circumferential ends of the support wall 16a of the opposing storage recess 16, which may damage the claw member 200 or the storage recess 16. In contrast, the support wall 16a of the storage recess 16 of the present invention is not a uniform flat surface, but has tapered surfaces 16b as recesses at least at both circumferential ends. Therefore, in the tilt start state where the claw member 200 has begun to tilt as shown in Figure 7(d), both circumferential ends of the side wall 200c on the removal direction side of the claw member 200 do not abut against the support wall 16a of the storage recess 16. However, in the tilt end state where the claw member 200 has finished tilting as shown in Figure 7(e), the side wall 200c on the removal direction side of the claw member 200 abuts against almost the entire surface of the tapered surface 16b of the storage recess 16 over the entire circumferential center and both ends (see Figure 8(d)). By forming the tapered surface 16b in this manner, at least when the claw member 200 starts to tilt, the side wall 200c on the side in the direction of removal of the claw member 200 does not come into contact with the support wall 16a of the storage recess 16 at both circumferential ends. In other words, the timing of the contact between the side wall 200c and the support wall 16a of the storage recess 16 can be delayed, so damage due to local stress concentration at both circumferential ends of the side wall 200c of the claw member 200 and the support wall 16a of the storage recess 16 can be prevented.

In addition, if tapered surface 16b or, as a modified example, tapered surface 16b' (see FIG. 5) is formed at least on both circumferential ends in this manner, the circumferential ends of side wall 200c on the ejection direction side of claw member 200 and support wall 16a of storage recess 16 will not come into contact initially, preventing damage due to local stress concentration at both circumferential ends of side wall 200c on the ejection direction side of claw member 200 and support wall 16a of storage recess 16.

In addition, as shown in FIG. 4(a), the boundary line 16c between the support wall 16a and the tapered surface 16b is formed in a substantially straight line, so not only can the claw member 200 be tilted around this boundary line 16c, but when the claw member 200 has finished tilting, the side wall 200c in the direction in which the claw member is removed and the tapered surface 16b of the storage recess 16 can come into contact over a wide surface area along the circumferential direction.

Depending on the tilting situation, the entire surface of the side wall 200c on the side of the ejection direction of the claw member 200, including the circumferential center and both ends in the circumferential direction, is not limited to abutting against the entire surface of the support wall 16a of the storage recess 16, and it is also possible that a part of the area on the circumferential center side or a part of the area on both ends is abutted. In this way, the side wall 200c on the ejection direction side of the claw member 200 and the support wall 16a of the storage recess 16 avoid local abutment at the end side as much as possible due to the movement of the insertion part 12 from the start of tilting to the end of tilting against the support wall 16a, and support is provided over a wider area including the circumferential center side from the start of tilting to the end of tilting, thereby preventing damage due to local stress concentration at both ends in the circumferential direction of the side wall 200c on the ejection direction side of the claw member 200 and the support wall 16a of the storage recess 16.

In addition, since the tapered surface 16b is formed on the inner diameter side of the support wall 16a, the tapered surface 16b functions as a support surface only when the claw member 200 is tilted. In addition, since both ends of the storage recess 16 in the circumferential direction with the support wall 16a are formed with tapered surfaces (tapered surfaces 16b), manufacturing is easy.

Next, the movement of the claw member according to the present invention will be described in comparison with the movement of a conventional claw member. First, the movement of the conventional claw member will be described. As shown in FIG. 9, a conventional claw member 200 is stored inside a conventional storage recess 160 in which only a support wall 160a is formed. FIG. 9(a) shows the state in which the claw member 200, which was engaged with the outer peripheral surface of the insertion portion 12, moves by the gap K while maintaining contact with the tip of the bolt 7 as the water pipe 11 moves, and the uniform side wall 200c on the withdrawal direction side of the claw member 200 abuts against the uniform support wall 160a of the storage recess 160, and the claw member 200 is in a state before tilting. FIG. 9(b) shows the state in which the claw member 200 maintains a state of abutment against the support wall 160a of the storage recess 160 and tries to follow the movement of the water pipe 11, so that the locking claw 200a of the claw member 200 tilts to bite into the outer peripheral surface of the water pipe 11. At this time, as shown in Figure 9 (b), only both circumferential ends of the side wall 200c on the side in the direction in which the claw member 200 is removed abut against the support wall 160a of the storage recess 160, and the circumferential central portion of the side wall 200c on the side in the direction in which the claw member 200 is removed does not abut against the support wall 160a of the storage recess 160. As a result, stress is concentrated at both circumferential ends of the side wall of the claw member 200, and also at the corresponding portions of both circumferential ends of the support wall 160a of the opposing storage recess 160. 9(c)-(d) show a state in which only both circumferential ends of the side wall 200c on the withdrawal direction side of the claw member 200 remain in contact with the support wall 160a of the storage recess 160, and the claw member 200 continues to tilt sequentially. Further stress is concentrated on both circumferential ends of the side wall of the claw member 200, and further stress is concentrated on the corresponding portions of both circumferential ends of the opposing support wall 160a of the storage recess 160, which may damage the claw member 200 or the storage recess 160.

In contrast, to explain the movement of the claw member of the present invention, as shown in Figure 8, the claw member 200 is stored inside the storage recess 16 in which the support wall 16a and tapered surface 16b of the present invention are formed. Figure 8(a) corresponds to Figures 6(c) and 7(c) described above, and as the water pipe 11 moves, the claw member 200 that was engaged with the outer circumferential surface of the insertion portion 12 moves by the gap K while maintaining contact with the tip of the bolt 7, and the circumferential center of the side wall 200c on the withdrawal direction side of the claw member 200 abuts against the circumferential center of the support wall 16a of the storage recess 16, and the claw member 200 shows the state before tilting. 8(b) corresponds to the above-mentioned Fig. 6(d) and Fig. 7(d), and shows a state in which the circumferential center of the side wall 200c on the side in the direction of removal of the claw member 200 is maintained in contact with the circumferential center of the support wall 16a of the storage recess 16 and tries to follow the movement of the water pipe 11, so that the locking claw 200a of the claw member 200 tilts to bite into the outer circumferential surface of the water pipe 11. At this time, as shown in Fig. 8(b), both circumferential ends of the side wall 200c on the side in the direction of removal of the claw member 200 simply enter the tapered surface 16b formed on both circumferential ends of the support wall 16a of the storage recess 16, but do not come into contact with the support wall 16a of the storage recess 16, so that no stress concentration occurs at both circumferential ends of the side wall of the claw member 200 or at portions corresponding to both circumferential ends of the support wall 16a of the opposing storage recess 16. 8(c)-(d) correspond to the above-mentioned FIG. 6(e) and FIG. 7(e), and show the state in which the claw member 200 is tilted further while the circumferential center of the side wall 200c on the side in the direction of removal of the claw member 200 is kept in contact with the circumferential center of the support wall 16a of the storage recess 16. Even in this case, both ends of the circumferential direction of the side wall 200c on the side in the direction of removal of the claw member 200 enter the tapered surface 16b formed on both ends of the support wall 16a of the storage recess 16 in the circumferential direction, so there is no stress concentration at both ends of the side wall of the claw member 200 in the circumferential direction or at the corresponding parts of both ends of the support wall 16a of the opposing storage recess 16 in the circumferential direction.

Next, the separation prevention device and its claw member according to the second embodiment will be described with reference to Figures 10 to 12. In the first embodiment, the tapered surface 16b is formed at both circumferential ends of the support wall 16a of the storage recess 16. However, as shown in Figure 10, the same effect can be obtained by forming tapered surfaces 20e at both circumferential ends of the side wall 20c on the side in the direction of removal of the claw member 20. In other words, since tapered surfaces 20e are formed at both circumferential ends of the side wall 20c on the side in the direction of removal of the claw member 20, the both circumferential ends of the side wall 20c on the side in the direction of removal of the claw member 20 do not abut against the support wall 160a of the conventional storage recess 160. In the tilting end state where the claw member 20 has finished tilting, the tapered surfaces 20e formed on both circumferential ends of the side wall 20c on the side in the direction of removal of the claw member 20 abut almost the entire surface of the support wall 160a of the storage recess 160 over the entire surface of the circumferential center and both ends. Note that, depending on the tilting situation, the entire surface of the side wall 20c on the side in the direction of removal of the claw member 20, including the circumferential center and both ends, is not limited to abutting the entire surface of the support wall 160a of the storage recess 160, and it is also possible that only a portion of the circumferential center side or a portion of both ends abuts.

As shown in Fig. 10(a), the tapered surface 20e of the claw member 20 of the present invention is formed gradually deeper toward the circumferential end. By forming it in this manner, the timing of the abutment of the side wall 20c on the side of the withdrawal direction of the claw member 20 and the support wall 160a of the storage recess 160 in the circumferential direction at both ends can be delayed, so that damage due to local stress concentration at both ends in the circumferential direction between the side wall of the claw member and the support wall of the storage recess can be prevented. In the embodiment shown in Fig. 10(a), the tapered surface 20e is provided continuously from one end to the other end, but as in the claw member 20' of the modified example shown in Fig. 11, the tapered surface 20e' and the tapered surface 20e' that are spaced apart from each other may be provided only in the areas close to both ends in the circumferential direction. In this way, if the tapered surface 20e is formed at least on both circumferential ends, the circumferential ends of the side wall 20c on the side in the direction of removal of the claw member 20 and the support wall 160a of the storage recess 160 will not come into contact first, so damage due to local stress concentration at both circumferential ends of the side wall 20c on the side in the direction of removal of the claw member 20 and the support wall 160a of the storage recess 160 can be prevented.

10(b), (d) and (e), the claw member 20 is arc-shaped when viewed from the front, and the side wall 20c on the side of the claw member 20 in the direction of removal has a tapered surface 20e formed on the inner diameter side of the side wall 20c in a tapered shape that gradually deepens toward the circumferential end, formed in a face-to-face relationship with the locking claw 20a. Also, as shown in FIG. 10(c), the claw member 20 is rectangular when viewed from the bottom, and the side wall 20c on the side of the claw member 20 in the direction of removal has a tapered surface 20e formed on the inner diameter side of the side wall 20c in a tapered shape that gradually deepens toward the circumferential end. In this way, since the tapered surface 20e is formed on the inner diameter side of the side wall 20c, the tapered surface 20e functions only when the claw member 20 is tilted. Also, since both ends of the claw member 20 in the circumferential direction are formed with a tapered surface (tapered surface 20e), manufacturing is easy. In addition, a tapered surface 20e is formed on the side wall 20c opposite the locking claw 20a, making it easier to tilt the claw member 20 and allowing the locking claw 20a to bite deeply into the insertion opening 12.

The operation of the claw member 20 will be described with reference to FIG. 12, focusing on the movement of the storage recess and the circumferential end of the claw member. The movement of the storage recess and the circumferential center of the claw member is almost the same as that in FIG. 6, so the description will be omitted. FIG. 12(a) shows the state before the claw member 20 is pushed in by the screwing of the bolt 7. The difference from FIG. 6(a) is that tapered surfaces 20e are formed at both ends in the circumferential direction of the side wall 20c on the side in the direction of removal of the claw member 20. As shown in FIG. 12(b), the claw member 20 is pressed toward the outer circumferential surface of the insertion portion 12 by the screwing of the bolt 7, and as shown in FIG. 12(c), the claw member 20 that was engaged with the outer circumferential surface of the insertion portion 12 moves by the gap K while maintaining contact with the tip of the bolt 7 as the water pipe 11 moves.

Then, as shown in Figures 12(d) to (e), the claw member 20 tilts. In the claw member 20 of the present invention, the side wall 20c on the side in the direction of removal of the claw member 20 is not a uniform flat surface as in the conventional art, but has tapered surfaces 20e formed at both ends in the circumferential direction. Therefore, in the tilt start state in which the claw member 20 starts to tilt as shown in Figure 12(d), both ends in the circumferential direction of the side wall 20c on the side in the direction of removal of the claw member 20 do not abut against the support wall 160a of the storage recess 160. In the tilt end state in which the claw member 20 has finished tilting as shown in Figure 12(e), the tapered surfaces 20e formed at both ends in the circumferential direction of the side wall 20c on the side in the direction of removal of the claw member 20 abut against almost the entire surface of the support wall 160a of the storage recess 160 over the entire surface of the circumferential center and both ends. Depending on the tilting situation, the entire surface of the side wall 20c on the side of the ejection direction of the claw member 20, including the circumferential center and both ends in the circumferential direction, is not limited to abutting against the entire surface of the support wall 160a of the storage recess 160, and it is also possible that a part of the area on the circumferential center side or a part of the area on both ends is abutted. In this way, the side wall 20c on the ejection direction side of the claw member 20 and the support wall 160a of the storage recess 160 avoid local abutment at the end side as much as possible by the recess from the start of tilting to the end of tilting of the claw member 20 against the support wall 160a due to the movement of the insertion part 12, and support is provided over a wider area including the circumferential center side from the start of tilting to the end of tilting, thereby preventing damage due to local stress concentration at both ends in the circumferential direction of the side wall 20c on the ejection direction side of the claw member 20 and the support wall 160a of the storage recess 160.

In the above embodiment, the claw member 20 has a locking claw 20a that extends from the side wall 20d on the insertion direction side in a direction perpendicular to the tube axis C and locks with the outer circumferential surface of the insertion port 12, but as a claw member of modified example 1, as shown in FIG. 13, the claw member 120 has a first locking claw 120a that locks with the outer circumferential surface of the extension insertion port 12 toward the insertion direction side, and a second locking claw 120b that locks with the outer circumferential surface of the extension insertion port 12 toward the withdrawal direction side. In this modified example 1, it functions not only as a device for preventing withdrawal, but also as a device for preventing movement in the insertion direction. In addition, the first locking claw 120a and the second locking claw 120b are approximately symmetrical with respect to a plane D perpendicular to the tube axis C, and the claw member 120 is stored in the storage recess 116 so that the first locking claw 120a or the second locking claw 120b tilts and bites into the outer circumferential surface of the insertion port 12. In addition, in the above embodiment, the bolt 7 presses the claw member 20 in the radial direction, but in this modified example 1, when the ends of the segments of the separation prevention device 15 are assembled together with bolts and nuts (not shown), the pressing force exerted by the bottom surface of the storage recess 116 is used to press the claw member 120 in the inward radial direction.

In addition, in addition to the tapered surface 116b corresponding to the tapered surface 16b in Example 1, the inner surface of the storage recess 116 is formed with expanding tapered surfaces 116c and 116d that expand toward the opening. This makes it easier for the claw member 120 to tilt by utilizing the expanding tapered surfaces 116c and 116d that expand toward the opening.

The inner surface of the storage recess 116 is not limited to the above-mentioned expanding tapered surfaces 116c and 116d, and may be provided with a bulge that bulges in the pipe axis C direction, for example. In this way, the claw member 120 abuts against the bulge as it moves in the pipe axis C direction together with the water pipe 11, and the first locking claw 120a or the second locking claw 120b can easily tilt with the bulge as a fulcrum, so that it can bite into the outer circumferential surface of the insertion portion 12 and lock the water pipe 11. Furthermore, the above-mentioned expanding tapered surfaces 116c and 116d may be formed on the inner surface, and a bulge may be provided. In this way, the locking claw 120a can tilt more easily.

Although not specifically shown, when the water pipe 11 moves in the other direction of the pipe axis C (to the right in the figure) opposite to the one direction of the pipe axis C described above (to the left in the figure), the claw member 120 operates in the same manner as described above, and the second locking claw 120b tilts, biting into the outer circumferential surface of the insertion portion 12 and locking the water pipe 11.

In addition, the first and second locking claws 120a and 120b are approximately symmetrical in the direction of the tube axis C, centered on a plane D perpendicular to the tube axis C, so that the same degree of anti-detachment and anti-movement functions can be achieved in both directions along the tube axis C.

Next, the operation of the anti-detachment function of the claw member 120 will be described. FIG. 13(a) is a cross-sectional view of the circumferential end of the storage recess 116 and the claw member 120, showing the state before the claw member 120 is pushed in. The circumferential end of the support wall (expanding tapered surface 116c) on the side of the storage recess in the direction of removal and the expanding tapered surface 116d on the side of the insertion direction are each formed with a tapered surface 116b corresponding to the tapered surface 16b in Example 1. As shown in FIG. 13(b), the claw member 120 is pressed toward the outer circumferential surface of the insertion portion 12, so that the first locking claw 120a and the second locking claw 120b bite into and lock into the outer circumferential surface of the insertion portion 12. Then, as shown in FIG. 13(c), if an unexpected external force such as an earthquake or an uneven force due to water pressure inside the water pipe 11 occurs in this position, the insertion portion 12 of the water pipe 11 moves in the direction in which the pipe axis C comes out, and the claw member 120, which was engaged with the outer circumferential surface of the insertion portion 12, moves the distance of the gap K in the direction in which the pipe axis C comes out while maintaining contact with the inner wall upper end surface 116e of the storage recess 116. This movement fills the above-mentioned gap K, and a gap K" is formed on the right side of the claw member 120 in the figure.

The anti-detachment device 15 then moves a predetermined distance in the direction in which the tube axis C comes out, and the hook of the arm 15b of the anti-detachment device 15 comes into contact with the flange 5a of the socket 5. Next, as shown in FIG. 13(d), the claw member 120, which has moved the gap K in the direction in which the tube axis C comes out, maintains contact with the inner wall upper end surface 116e of the storage recess 116, comes into contact with the support wall (expanded tapered surface 116c) of the storage recess 116, and further presses the anti-detachment device 15 in the direction in which the tube axis C comes out.

13(d), the claw member 120 maintains contact with the inner wall upper end surface 116e of the storage recess 116, and the first locking claw 120a of the claw member 120 tilts toward the outer circumferential surface of the water pipe 11. In this way, the first locking claw 120a of the claw member 120 locks into the insertion portion 12, and the storage recess 116 in which the claw member 120 is stored is used as a reaction force to cause the first locking claw 120a to bite into the outer circumferential surface of the insertion portion 12, thereby preventing the water pipe 11 from moving in the direction in which the pipe axis C comes out relative to the separation prevention device 15.

As in the first embodiment, the support wall (expanding tapered surface 116c) on the ejection direction side of the storage recess 116 is not a uniform flat surface, but has tapered surfaces 116b formed at both circumferential ends. Therefore, in the tilt start state in which the claw member 120 begins to tilt as shown in FIG. 13(d), both circumferential ends of the side wall 120c on the ejection direction side of the claw member 120 do not abut against the support wall (expanding tapered surface 116c) of the storage recess 116. In the tilt end state in which the claw member 120 has finished tilting, the side wall 120c on the ejection direction side of the claw member 120 abuts against almost the entire surface of the tapered surface 116b of the storage recess 116 over the entire circumferential center and both ends. Depending on the tilting conditions, the entire surface of the side wall 120c on the side in the ejection direction of the claw member 120, including the circumferential center and both circumferential ends, is not necessarily in contact with the entire support wall (expanding tapered surface 116c) of the storage recess 116, but it is also possible that only a portion of the area on the circumferential center side or a portion of the area on both ends is in contact. In this way, as the claw member 120 in the storage recess 116 starts to tilt against the support wall (expanding tapered surface 116c) due to the movement of the insertion portion 12, the side wall 120c on the side in the direction in which the claw member 120 comes out and the support wall (expanding tapered surface 116c) of the storage recess 116 avoid local contact at the end as much as possible due to the recess, and support is provided over a wider area, including the central side in the circumferential direction, from the start of the tilting to the end of the tilting, thereby preventing damage due to local stress concentration at both circumferential ends of the side wall 120c on the side in the direction in which the claw member 120 comes out and the support wall (expanding tapered surface 116c) of the storage recess 116.

Also, as in the second embodiment, the same effect can be obtained by forming tapered surfaces (not shown) at both circumferential ends of the side wall 120c on the side in the direction of withdrawal of the claw member 120.

Furthermore, in the first modification, as described above, in addition to the first locking claw 120a, the second locking claw 120b is provided, so that it also has a function of preventing movement in the insertion direction. In other words, as shown in FIG. 13, by forming tapered surfaces (not shown) at both circumferential ends of the support wall (expanded tapered surface 116d) of the storage recess 116, or by forming tapered surfaces (not shown) at both circumferential ends of the side wall 120d on the insertion direction side of the claw member 120, it is possible to obtain the effect of preventing damage due to local stress concentration at both circumferential ends of the side wall 120d on the insertion direction side of the claw member 120 and the support wall (tapered surface 116d) of the storage recess 116, as well as the separation prevention function.

As shown in FIG. 14, the claw member 220 of the second modified example has a first locking claw 220a that extends from the side wall 220d on the insertion direction side toward the tube axis C and locks with the outer circumferential surface of the insertion port 12, and a second locking claw 220b at the center of the bottom surface of the claw member 220 that extends from the side wall 220c on the withdrawal direction side toward the tube axis C and locks with the outer circumferential surface of the insertion port 12. In this second modified example, the first locking claw 220a and the second locking claw 220b both function as a detachment prevention device. The claw member 220 is stored in the storage recess 216 so that the first locking claw 220a and the second locking claw 220b tilt and bite into the outer circumferential surface of the insertion port 12. In addition, in the first embodiment, the bolt 7 presses the claw member 200 in the radial direction, but in this second modification, the assembly force generated when the ends of the divided bodies of the separation prevention device 15 are assembled with the bolts and nuts 9a and 9b is used to press the claw member 220 in the inward radial direction, so the bolt 7 is not shown. In addition, the inner wall upper end surface 216e of the storage recess 216 is inclined toward the removal direction, and the upper wall 220f of the claw member 220 is also inclined toward the removal direction.

Explaining the operation of the claw member 220, FIG. 14(a) is a cross-sectional view of the circumferential end of the storage recess 216 and the claw member 220, showing the state before the claw member 220 is pushed in. The circumferential end of the support wall 216a on the side in the direction of removal of the storage recess is formed with a tapered surface 216b corresponding to the tapered surface 16b in Example 1. As shown in FIG. 14(b), the claw member 220 is pressed toward the outer circumferential surface of the insertion portion 12, so that the first locking claw 220a and the second locking claw 220b bite into and lock into the outer circumferential surface of the insertion portion 12. Then, as shown in FIG. 14(c), when an unexpected external force such as an earthquake or an uneven force due to water pressure in the water pipe 11 occurs in this position, the insertion portion 12 of the water pipe 11 moves in the direction of removal of the pipe axis C, and the claw member 220 that was engaged with the outer circumferential surface of the insertion portion 12 moves in the direction of removal of the pipe axis C by the gap K while maintaining contact with the inner wall upper end surface 216e of the storage recess 216. This claw member 220 moves along the inner wall upper end surface 216e of the storage recess 216, which is inclined toward the removal direction, so that as it moves, the claw member 220 is pushed in a direction perpendicular to the pipe axis C, and the locking claw 220a can be deeply inserted into the insertion portion 12. Then, the above-mentioned gap K is filled, and a gap K" is formed on the right side of the claw member 220 in the figure.

The detachment prevention device 15 then moves a predetermined distance in the direction in which the tube axis C comes out, and the hook of the arm 15b of the detachment prevention device 15 comes into contact with the flange 5a of the socket 5. Next, as shown in FIG. 14(d), the claw member 220, which has moved the gap K in the direction in which the tube axis C comes out, comes into contact with the support wall 216a of the storage recess 216, and further presses the detachment prevention device 15 in the direction in which the tube axis C comes out.

14(d), the claw member 220 maintains contact with the support wall 216a of the storage recess 216, and the first and second locking claws 220a and 220b of the claw member 220 tilt toward the outer circumferential surface of the water pipe 11. In this way, the first and second locking claws 220a and 220b of the claw member 220 are locked to the insertion portion 12, and the first and second locking claws 220a and 220b bite into the outer circumferential surface of the insertion portion 12 using the storage recess 216 in which the claw member 220 is stored as a reaction force, thereby preventing the water pipe 11 from moving in the direction in which the pipe axis C comes out relative to the separation prevention device 15.

As in the first embodiment, the support wall 216a on the ejection direction side of the storage recess 216 is not a uniform flat surface, but has tapered surfaces 216b formed at both circumferential ends. Therefore, in the tilt start state where the claw member 220 begins to tilt as shown in FIG. 14(d), both circumferential ends of the side wall 220c on the ejection direction side of the claw member 220 do not abut against the support wall 216a of the storage recess 216. In the tilt end state where the claw member 220 has finished tilting, the side wall 220c on the ejection direction side of the claw member 220 abuts against almost the entire surface of the tapered surface 216b of the storage recess 216 over the entire circumferential center and both ends. Depending on the tilting situation, the entire surface of the side wall 220c on the side of the ejection direction of the claw member 220, including the circumferential center and both ends in the circumferential direction, is not limited to abutting against the entire surface of the support wall 216a of the storage recess 216, and it may be that a part of the area on the circumferential center side or a part of the area on both ends is abutted. In this way, the side wall 220c on the ejection direction side of the claw member 220 and the support wall 216a of the storage recess 216 avoid local abutment at the end side as much as possible by the recess from the start of tilting to the end of tilting of the claw member 220 against the support wall 216a due to the movement of the insertion part 12, and support is provided over a wider area including the circumferential center side from the start of tilting to the end of tilting, thereby preventing damage due to local stress concentration at both ends in the circumferential direction of the side wall 220c on the ejection direction side of the claw member 220 and the support wall 216a of the storage recess 216.

Also, as in the second embodiment, the same effect can be obtained by forming tapered portions (not shown) at both circumferential ends of the side wall 220c on the ejection side of the claw member 220.

As described above, the embodiment of the detachment prevention device has a storage recess 16 (160) that is opened toward the receiving port side relative to the insertion port 12 and faces inward in the circumferential direction, and a claw member 200 (20) that is tiltably stored in the storage recess 16. Within the storage recess 16 (160), a support wall 16 (160) a that supports and tilts one side wall 200 (20) c of the claw member 200 (20) is provided extending in the circumferential direction, and the support wall 16 a of the storage recess 16 or the side wall 20 c of the claw member 20 has a tapered surface 16 b (tapered surface 20 e) on the circumferential end side. is formed, so that when the claw member 200 (20) in the storage recess 16 (160) starts to tilt relative to the support wall 16 (160) a due to the movement of the insertion portion 12, the side wall 200 (20) c of the claw member 200 (20) and the support wall 16 (160) a of the storage recess 16 (160) avoid contact at the end side as much as possible due to the tapered surface 16 b or tapered surface 20 e, and support is provided for a longer period on the central side in the circumferential direction, thereby preventing damage due to stress concentration at both ends of the side wall 200 (20) c of the claw member 200 (20) and the support wall 16 (160) a of the storage recess 16 (160).

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

In the above-mentioned first and second embodiments, the claw member 200 (20), the storage recess 16 (160), and the bolt 7 constituting the movement prevention means are installed or formed in the detachment prevention device 15, but this is not limited thereto. For example, as shown in FIG. 15, as a detachment prevention device of variant example 3, the end 305 of the water pipe 302 itself is configured as a receiving portion, and this end 305 is formed with a plurality of storage recesses 16 (160) along the circumferential direction that open toward the outer circumferential surface of the insertion portion 312 of the water pipe 311 and store the claw member 200 (20) therein, and a bolt 307 screwed into a bolt hole 306 formed in communication with the storage recess 16 (160) of the end 305 presses against each claw member 200 (20) stored inside the storage recess 16 (160). In this case, it is possible to select whether to form a tapered surface 16b on the circumferential end side of the support wall 16a of the storage recess 16 as in Example 1, or to form a tapered surface 20e on the circumferential end side of the side wall 20c of the claw member 20 as in Example 2.

Furthermore, as a detachment prevention device of variant example 4, as shown in Figure 16, the base and arm constituting the detachment prevention device 415 may be an integrated member. More specifically, the end of the anti-detachment device 415 on the receiving portion 405 side is formed into a hook portion 415a having an inner diameter smaller than the bulge portion 405a of the receiving portion 405, and by abutting the bulge portion 405a along the circumferential direction, movement of the pipe axis C in one direction (to the left in the figure) is prevented. Furthermore, an annular surface 415b of approximately the same diameter as the tip surface 405b of the receiving portion 405 is formed between the storage recess 16 (160) and the hook portion 415a, and by abutting the tip surface 405b of the receiving portion 405 along the circumferential direction, movement of the pipe axis C in the other direction (to the right in the figure) is prevented. The anti-detachment device 415 can move a predetermined length relative to the receiving portion 405 in the pipe axis C direction together with the water pipe 411, and can also be applied to those that prevent movement of a fluid pipe in both directions of the pipe axis C. In this case, it is possible to select whether to form a tapered surface 16b on the circumferential end side of the support wall 16a of the storage recess 16 as in Example 1, or to form a tapered surface 20e on the circumferential end side of the side wall 20c of the claw member 20 as in Example 2.

As a detachment prevention device of the fifth modified example, the present invention may be applied to a storage recess and a claw member provided in the press ring, as shown in FIG. 17. More specifically, the water pipe 502 as the receiving pipe and the water pipe 511 as the insert pipe are inserted between the inner peripheral surface of the receiving portion 505 and the outer peripheral surface of the insert portion 512 via an annular seal material 525 arranged around the entire circumference. An annular press ring 522 formed integrally with the outer peripheral surface of the insert portion 512 is fitted on the outside. This press ring 522 has a pressing portion 522a that protrudes toward the flange 505a of the receiving portion 505. The press ring 522 is connected to the flange 505a by fastening a plurality of T-head bolt nuts 523. As the pressing ring 522 and the flange 505a are brought closer together by this fastening, the seal material 525 pressed by the pressing portion 522a is brought into close contact with the inner peripheral surface of the socket portion 505 and the outer peripheral surface of the insertion portion 512, and the water pipe 502 as the socket pipe and the water pipe 511 as the insertion pipe are connected in a hermetically sealed manner. The pressing ring 522 is fixed to the water pipe 511 by pressing the claw member 200 (20) arranged in the storage recess 16 (160) with the bolt 524 screwed in the inner diameter direction. The claw member 200 (20) bites into the outer peripheral surface of the water pipe 511. The claw member 200 (20) and the bolt 524 of the pressing ring 522 are equally arranged in the circumferential direction. The separation prevention device of the present invention can be applied to the pressing ring 522 having such a storage recess 16 (160) and claw member 200 (20). In this case, it is possible to select whether to form a tapered surface 16b on the circumferential end side of the support wall 16a of the storage recess 16 as in Example 1, or to form a tapered surface 20e on the circumferential end side of the side wall 20c of the claw member 20 as in Example 2.

In addition, while the pressure ring 522 in variant 5 is integrally formed in the circumferential direction, this is not necessarily limited to this, and the pressure ring provided on the fluid pipe to which the separation prevention device of the present invention is applied may have a structure that is divided in the circumferential direction, for example.

2 Water pipe (socket pipe)
5 Socket portion 7 Bolt (pressing portion)
9a, 9b Bolt nut 11 Water pipe (insertion pipe)
12 Insertion port 15 Detachment prevention device 16, 160 Storage recess (claw chamber)
16a, 160a Support wall 16b Tapered portion 20, 200 Claw member 20a Engagement claw 20c, 20d Side wall 20e Tapered portion 22, 522 Press ring

Claims (5)

A detachment prevention device having a storage recess formed on the receiving side of an insertion tube and facing inwardly, and a claw member tiltably stored in the storage recess,
a support wall extending in a circumferential direction within the storage recess for supporting and tilting one of the side walls of the claw member, and a recess formed on one of the inner diameter sides of the side wall of the claw member and the inner diameter side of the support wall at an end side in the circumferential direction capable of contacting the other of the inner diameter side of the side wall of the claw member and the inner diameter side of the support wall, the recess formed only on the side opposite to a locking claw formed on one of the side walls of the claw member . The device for preventing separation according to claim 1, characterized in that the recess is formed deeper toward the end in the circumferential direction. The device for preventing separation according to claim 1 or 2, characterized in that the recess is formed at an angle with respect to the pipe diameter direction. A separation prevention device according to any one of claims 1 to 3, characterized in that the recesses are formed on both circumferential end sides. A claw member is tiltably accommodated in a storage recess formed on the receiving side of the insertion tube and facing inwardly,
A claw member characterized in that a recess is formed on the inner diameter side of the side wall of the claw member at the circumferential end side so as to be able to abut against the inner diameter side of the accommodating recess, and the recess is formed only on the side opposite to a locking claw formed on one side wall of the claw member .

Images