WO2008009171A1 - Keyless drill chuck having mechanism against loosening by impact - Google Patents

Abstract

A keyless drill chuck having a mechanism against loosening by impact includes a drill body which assembles the gripping jaws, bearing assembly and nut together, a jacket, a snap spring, a front housing, a back housing, a retaining ring and a cover. The screw thread on the gripping jaws mesh with the thread on the nut; the jacket is fixedly attached to the nut ring; the snap spring is made of elastic material, and it connects with the jacket and the front housing by twist tabs. So the front housing can rotate along with the snap spring and the jacket, and further rotate the nut ring. The width of the straight groove of the front housing is wider than that of the twist tabs, so the front housing can rotate to a predetermined extent with respect to the snap spring. Therefore, the spring strips have two positions: a position in which the gripping jaws contact with the drill body and another position in which the gripping jaws do not contact with the drill body. So it can control the nut ring to rotate or not, thus preventing the drill chuck from loosening by impact.

Description

 Keyless drill chuck with anti-shock loosening mechanism

Technical field

 The invention relates to a keyless drill chuck having an anti-shock loosening mechanism. Background technique

 Hand-tight drill chucks are a common tool used in daily life, mainly for eye-catching and drilling holes when installing or fixing items. As shown in FIG. 12, the existing drill chuck includes a body 1, a bearing member 2, three jaws 3, a screw ring 4, a front cap 7, a rear cap 8, and a shutter 10, wherein the body 1 is provided with three The column hole 12 for accommodating and guiding the jaws 3, the front cap 7 is used to drive the screw ring 4 to rotate and drive the three jaws 3 for clamping and releasing action, thereby achieving the purpose of clamping and loosening the drill bit. However, since the existing hand-tight drill chuck is not provided with a locking device, it is easy to loosen the drill bit at the front end due to strong vibration during impact drilling, which may affect the quality of the eye-catching, and may seriously break the drill bit and cause danger.

 To this end, those skilled in the art have devised various locking devices to prevent loosening of the drill bit, such as the drill chuck disclosed in Chinese Patent No. 1338343A, CN 1318445A, but these drill chucks with locking devices are There are problems such as complicated structure, poor force transmission between the front cap and the screw ring, and inconvenient disassembly and assembly. Summary of the invention

 The object of the present invention is to provide a keyless drill chuck with an anti-shock loosening mechanism, which improves the overall structure of the drill chuck by the structural improvement of the circlip and the body, and the front cap and the spiral ring The transfer of force between the two is better, so that it is more convenient and simple to use.

 The keyless drill chuck having the anti-shock loosening mechanism of the present invention comprises a body, a bearing component, three jaws, a screw ring, a jacket, a snap spring, a front cap, a rear cap, a retaining ring and a cover, wherein:

The body is a hollow cylinder, one end of the body is provided as a screw hole or a taper hole for coupling with the drive shaft; the outer side wall of the middle portion is provided with a shoulder groove for accommodating the bearing component and the screw ring; And at Disposed symmetrically along the axis of rotation of the body, there are three column holes which are inclined to converge forwardly to communicate with the shoulder groove, and the body is provided with a plurality of axial grooves for engaging the circlip on the outer side wall of the other end;

 The three clamping jaws are respectively inserted into the three column holes, each of the clamping jaws comprises a thread; the screw ring is directly sleeved at the shoulder groove of the body, the thread of the screw ring Engagement with the thread of the jaw;

 One end of the jacket is fixedly connected to the outer wall of the spiral ring, and the other end is provided with at least one radial groove; the spring is a cylindrical structure made of an elastic material, and includes the same number of radial grooves as the jacket. a torsion wing, at least one positioning spring and one or more rotation preventing springs, wherein the positioning spring and the rotation spring are respectively provided with a flange radially outward, and the rotation spring is at one end of the flange Providing a claw that can be prevented from rotating in the opposite direction in the groove in the body;

 The inner wall of the front cap is provided with a circular arc groove for connecting with the flange and a groove for connecting with the flange, and is also provided with a straight groove and a boss, wherein the straight groove is used for receiving The circlip passes through the torsion wing of the radial groove of the jacket, and the width of the straight groove is greater than the width of the torsion wing, so that the front cap and the circlip have appropriate relative rotation intervals.

 The inner wall of the jacket is provided with at least one projection for preventing axial displacement of the retaining spring.

 The three column holes are axially symmetrically distributed at the shoulder groove.

 The outer wall of the front cap is provided with an anti-slip pattern.

 The spiral ring includes two or more parts that can be assembled into a ring to facilitate assembly.

 The keyless drill chuck with the anti-shock loosening mechanism of the invention has many features of compact structure and good maintainability, especially through the arrangement of the torsion wings in the circlip, so that the force transmission between the front cap and the spiral ring is transmitted. It is more convenient and accurate, and has the feature of being removably disassembled by the connection of the torsion wing and the radial groove of the jacket.

DRAWINGS

 Figure 1 is an exploded perspective view of the drill chuck of the present invention;

Figure 2 is a cross-sectional view showing the drill chuck of the present invention; Figure 3 is a cross-sectional view of the drill chuck shown in Figure 2 taken along line BB, showing the structure in a loose state;

 Figure 3A is a cross-sectional view of the drill chuck shown in Figure 2 taken along line B-B, showing the structure in a clamped state;

 Figure 4 is a cross-sectional view of the drill chuck shown in Figure 2 taken along line D-D, showing the structure in a loosened state;

 Figure 4A is a cross-sectional view of the drill chuck shown in Figure 1 taken along line D-D, showing the structure in a clamped state;

 Figure 5 is a perspective view of the body of the present invention;

 Figure 6 is a perspective view of the jacket of the present invention;

 Figure 7 is a perspective view showing a first embodiment of the circlip according to the present invention;

 Figure 8 is a perspective view showing the second embodiment of the circlip according to the present invention;

 Figure 9 is a perspective view showing a third embodiment of the circlip according to the present invention;

 Figure 10 is a perspective view of the front cap mated with the retaining spring shown in Figure 7;

 Figure 11 is a perspective view of the front cap mated with the retaining spring shown in Figure 8;

 Fig. 12 is a schematic view showing the structure of the conventional drill chuck without the anti-loose mechanism. detailed description

 Specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The numbers are the same, so the structure and function of the parts with the same reference numerals will not be described in detail.

 Embodiment 1

As shown in FIG. 1 and FIG. 2, the keyless cobalt chuck having the anti-shock loosening mechanism in the embodiment includes a body 1, a bearing member ² , three jaws 3, a screw ring 4, a jacket ⁵ , and a snap spring 6 The front cap 7, the rear cap 8, the dam 9 and the cover 10 are composed. among them:

As shown in FIG. 1 and FIG. 5, the body 1 is generally a hollow cylinder, and is disposed at one end of the cylinder. a screw hole 11 or a taper hole for coupling with the drive shaft; a shoulder groove 13 for accommodating the bearing member 2 and the screw ring 4 is provided on the outer side wall of the middle portion of the cylinder, and three inclinations are symmetrically distributed along the rotation axis of the body 1 The column hole 12 which converges forward and communicates with the shoulder groove 13 is provided with a plurality of axial grooves 14 for engaging the retaining spring 6 on the outer side wall of the other end of the cylinder.

 As shown in Figs. 1 and 2, three jaws 3 are respectively inserted in the three column holes 12, and each of the jaws 3 includes a thread 31.

 As shown in FIG. 1, the spiral ring 4 includes two parts that can be assembled into a ring (which may also be three parts or four parts for assembly), and is directly attached to the shoulder groove 13 of the body 1 during assembly, and assembled. After that, the thread 40 of the screw ring 4 meshes with the thread 31 of the jaw 3, that is, the three jaws 3 can be moved while rotating the screw ring 4, thereby achieving the purpose of clamping and loosening the drill bit.

 As shown in FIG. 1 and FIG. 6, one end 50 of the jacket 5 is connected to the outer wall of the spiral ring 4 (it can also be fixedly connected by a connecting member, or can be engaged with each other, ribs, protrusions, grooves, pits, The hole and the hooking structure are connected, and the other end is provided with three (also one, two or more) radial grooves 51 for coupling with the torsion wings 60 of the snap spring 6. The jacket 5 is provided with at least one protrusion 52 on the inner surface of one end of the radial groove 51, and the protrusion 52 is axially positioned between the card spring 6 and the jacket 5, and the protrusion 52 can pass The forging method is formed directly from the wall of the jacket 5, or may be formed in other forms as long as it can be axially positioned with the retaining spring 6.

As shown in FIGS. 1 and 7, the retaining spring 6 is a cylindrical structure made of an elastic material, and includes a twisting wing 60, two positioning springs 61, and a rotation stop which are coincident with the number of the radial grooves 51 of the jacket 5. Reed 62. The twisting wing 60 is perpendicular to the cylinder of the circlip 6 and directly passes through the radial groove 51 of the jacket 5 during assembly, and has a width substantially coincident with the radial groove 51, and only a small gap for easy disassembly; the positioning spring 61 is The flange not connected radially outward is provided with a flange 63, and the rotation preventing spring 62 is also provided with a flange 64 radially outwardly at an end not connected to the cylinder, and one end of the flange 64 is slidable The claw 65 in the groove 1 of the body 1, wherein the groove 14 is a structure for moving the claw 65 in a single direction, since the structure is prior art, it is easily realized by those skilled in the art, Therefore, it will not be described in detail. ' As shown in FIG. 10, the inner wall of the front cap 7 is provided with two steps 75, 76, wherein three straight grooves 73 are provided on the step 75 for connecting with the torsion wings 60 of the snap spring 6, that is, the twisting wings 60 pass through. The radial groove 51 of the jacket 5 is coupled with the straight groove 73 of the front cap 7 to achieve clamping or loosening torque transmission, and the width of the straight groove 73 is greater than the width of the torsion wing 60, so that the front cap 7 and the snap spring 6 have Proper relative rotation interval. The front cap 7 is provided on the other step 76 with a circular arc groove 70, 71 corresponding to the position of the flange 63 on the positioning spring 61, and a groove 72 corresponding to the position of the flange 64 of the rotation preventing spring 62, A boss 74 is disposed adjacent to the recess 72. When the flange 64 is engaged with the boss 74, the claw 65 on the flange 64 can abut against the recess 14 of the body 1, so that the screw ring 4 can only Rotate in one direction in the direction of clamping to prevent loosening. The front cap 7 in this embodiment is an integral metal structure, that is, the straight groove 73, the circular arc groove 70, 71 and the groove 72 are directly formed of a metal material, and the outer surface is provided with an anti-slip pattern 77. The front cap 7 in the example has the advantages of high strength, long service life, and no cracking during impact due to the integral metal crucible.

 The assembly and use process of the keyless drill chuck with the anti-shock loosening mechanism in this embodiment is as follows: As shown in FIG. 2, FIG. 3, FIG. 3A, FIG. 4 and FIG. 4A, the rear cap 8 is first fixed during assembly. At the end of the body 1, three jaws 3 are respectively inserted into the three oblique column holes 12 of the body 1, and then the bearing member 2 and the screw ring 4 are placed in the shoulder groove 13 of the body 1, and then the clamp is placed The upper end 50 of the sleeve 5 is connected to the outer wall of the spiral ring 4, and the torsion wing 60 of the retaining spring 6 passes through the radial groove 51 of the jacket 5 and then snaps into the straight groove 73 of the front cap 7, while the retaining spring 6 The flange 63 of the positioning spring 61 and the flange 64 on the rotation preventing spring 62 are respectively caught in the circular arc groove 70 and the groove 72 on the inner wall of the front cap 7. Finally, the retaining ring 9 and the cover 10 are fixed and packaged. Since the retaining ring 9 and the cover 10 are prior art, they will not be described in detail.

When the tool needs to be clamped in use, the front cap 7 is rotated in the clamping direction. At this time, the relative positions of the front cap Ί and the circlip 6 are as shown in FIGS. 3 and 4, and the front cap 7 passes through the circular groove 71 and the groove. 72 acts on the flanges 63, 64 of the circlip 6, and drives the circlip 6, the jacket 5 and the screw 4 to rotate synchronously, and further pushes the clip by the action of the thread 4 and the thread 31 of the screw 4 and the jaw 3. The pawl 3 moves in the clamping direction. When the jaw 3 starts to grip the tool and gradually increases the clamping force, the damping of the jaw 3 also increases. And transmitted to the front cap 7 through the spiral ring 4 and the retaining spring 6, when the damping reaches a predetermined value, the transmission force between the flanges 63, 64 of the retaining spring 6 and the grooves 71, 72 of the front cap 7 reaches the limit, and further When the front cap 7 is rotated, the flanges 63, 64 of the retaining spring 6 are elastically deformed, and relative rotation of the front cap 7 and the snap spring 6 occurs. When the torsion blade 60 of the circlip 6 contacts the straight groove 73 of the front cap, the relative rotation of the circlip 6 and the front cap 7 ends. At this time, the flange 63 of the retaining spring 61 of the retaining spring 6 just enters the next circular arc groove 70 of the front cap 7, and the flange 64 of the retaining spring 62 of the retaining spring 6 is pressed by the boss 74 of the front cap 7. Next, the claw 65 of the rotation preventing spring 62 abuts into the recess 14 of the body 1, so that the retaining spring 6 can only continue to rotate in one direction in the clamping direction.

 When the tool needs to be loosened, the front cap 7 is rotated in the opposite direction. Since the releasing force applied to the front cap 7 is greater than the engaging force of the flange 63 of the retaining spring 61 on the retaining spring 61 and the recess 70 of the front cap 7, the front cap 7 is rotated relative to the circlip 6 when the torsion wing 60 of the circlip 6 abuts against the other side of the straight groove 73 of the front cap 7, the relative rotation of the front cap 7 and the circlip 6 is completed, and the circlip 6 is fixed. The flange 63 of the sheet positioning spring 61 enters another recess 71 adjacent to the front cap 7, and the flange 64 of the rotation preventing spring 62 enters the recess 72 of the front cap 7 from the boss 74 of the front cap 7, The claw 65 disengages the recess 14 of the body 1 under the elastic force, so that the front cap 7 can drive the circlip 6, the jacket 5 and the screw ring 4 to rotate together in the loosening direction, further driving the jaws 3 to release. Directional movement, loosen the tool.

 Embodiment 2

 The keyless drill chuck having the anti-shock loosening mechanism in this embodiment is substantially the same as that in the first embodiment, the only difference being that the retaining spring 6 in the present embodiment includes a positioning spring 61 and a rotation preventing spring. The sheet 62, as shown in FIG. 9, and according to the number of the positioning spring 61 and the rotation preventing spring 62, the number of the circular arc grooves 71, 70 and the groove 72 on the inner wall of the front cap 7 also changes accordingly, and The position of the positioning spring 61 and the rotation preventing spring 62 is changed to change the position, that is, the flanges 63, 64 in the retaining spring 6 and the circular arc grooves 70, 71 and the recess 72 in the front cap 7 have a clear relative position. Claim,.

 Embodiment 3

The keyless drill chuck having the anti-shock loosening mechanism in this embodiment is substantially the same as that in the first embodiment, and the only difference is that the retaining spring 6 in the embodiment includes two positioning springs 61 and two. Detent spring 62, as shown in FIG. 8, and the positioning spring 61 and detent spring ⁶² spaced apart, since the positioning spring 61 and detent spring 62 to change the number of arc on the inner wall of the front cap 7 The number of the grooves 71, 70 and the groove 72 also changes accordingly, as shown in Fig. 11, and the position is changed according to the positional change of the positioning spring 61 and the rotation preventing spring 62, that is, the flange 63 in the retaining spring 6, 64 has a clear relative positional requirement with the arcuate recesses 70, 71 and recess 72 in the front cap 7.

Claims

Claim 1. A keyless drill chuck with an anti-shock loosening mechanism, comprising a body (1), a bearing component (2), three jaws (3), screw ring (4), jacket (5), snap spring (6), front cap (7), rear cap (8), retaining ring (9) and cover (10), which is characterized by:  The body (1) is a hollow cylinder, one end of the body is provided as a screw hole or a taper hole (11) for coupling with the drive shaft; and the outer side wall of the middle portion is provided with a bearing member for housing (2) ) and spiral ring (4) The shoulder groove (13); symmetrically distributed along the axis of rotation of the body (1), there are three column holes (12) which are inclined forwardly to communicate with the shoulder groove, and the body (1) is outside the other end The wall is provided with a plurality of axial grooves (14) for engaging the circlip (6);  The three jaws (3) are respectively inserted in the three column holes (U), and each of the jaws (3) comprises a thread (31);  The screw ring (4) is directly sleeved at the shoulder groove (13) of the body, and the thread (40) of the screw ring meshes with the thread (31) of the jaw (3); One end (50) of the jacket (5) is fixedly connected to the outer wall of the spiral ring (4), and the other end is provided with at least one radial groove ( _51); the retaining spring (6) is made of an elastic material. a cylindrical structure comprising a torsion wing (60) having a number of radial grooves ( ⁵¹ ) of the jacket (5), at least one positioning spring (61) and one or more rotation preventing springs (62), The positioning spring (61) and the rotation preventing spring (62) are respectively provided with a flange 64) radially outward, and the rotation spring (62) is provided at one end of the flange (64). a claw (6 ⁵ ) in the recess (14) of the body (1) that cannot be rotated in the opposite direction; The inner wall of the front cap (7) is provided with a circular arc groove (70, 71) for connecting with the flange (63) and a groove (72) for connecting with the flange (64). Straight groove (73) and boss (74) are also provided, wherein the straight groove (73) is used for accommodating the circlip (6) and the twisting wing (60) of the radial groove (51) which passes through the jacket (5) And the width of the straight groove (73) is larger than the width of the torsion wing (60), so that the front cap (7) and the circlip (6) have appropriate relative rotation intervals. 2. A keyless drill chuck having an anti-shock loosening mechanism according to claim 1, wherein: the inner wall of the jacket (5) is provided with at least one axial member for preventing the spring of the retaining spring (6) Displacement bulge (52).  3. A keyless drill chuck having an impact-proof loosening mechanism according to claim 1, wherein: said three column holes (12) are axially symmetrically distributed at said shoulder groove (13) .  A keyless drill chuck having an impact-proof loosening mechanism according to claim 1, wherein: said retaining spring (6) includes two anti-rotation springs (62). 5. A keyless drill chuck having an impact-proof loosening mechanism according to claim 1, wherein: said retaining spring (6) comprises two positioning springs (61) and two non-rotating springs (6 ² ).  6. A keyless drill chuck having an impact-proof loosening mechanism according to claim 1, wherein: said retaining spring (6) comprises two positioning springs (61).  A keyless drill chuck having an anti-shock loosening mechanism according to claim 1, wherein: the outer wall of the front cap (7) is provided with an anti-slip pattern (77).  A keyless drill chuck having an impact-proof loosening mechanism according to claim 1, wherein: said screw ring (4) comprises two or more parts that can be assembled into a circular ring.  9. A keyless drill chuck having a shock-proof loosening mechanism according to claim 1, wherein: said jacket (5) is in interference with the outer wall of the threaded ring (4).