WO2012003647A1 - Bundling machine - Google Patents

Abstract

A bundling machine includes a body (1), a hand shank (4), and a scroll (8). The hand shank (4) and the body (1) are hinged together by the scroll (8). A ratchet (2) and a winding tape (3) are fixed on the scroll (8). A handle (6) is connected to the hand shank (4) in a sliding manner. The end of the handle (6) can be embedded into a space between the teeth of the ratchet (2). A baffle plate is connected to the body (1) in a sliding manner. The end of the baffle plate can be embedded into a space between the teeth of the ratchet (2). A coil spring (14) is provided between the scroll (8) and the body (1). The inner end of the coil spring (14) is connected with the scroll (8). And the outer end of the coil spring (14) is connected with the body (1). The scroll (8) always has a trend to wind up the winding tape (3) under the resilience of the coil spring (14). The bundling machine has advantages of rational design, prolonged service life, aesthetic appearance and improved rolling efficiency. The clutch mechanism of the bundling machine has advantages of simple structure and rational design.

Description

 Manual bundler technical field

 The invention belongs to the field of work and transportation technology, and relates to a device for binding or fixing goods, in particular to a binding device. Background technique

 In the process of carrying goods in a car, the goods usually need to be fixed to make the delivery safe and reliable. Bundling with ordinary nylon ropes or wire ropes is not only inefficient, but also laborious to operate; at the same time, it is difficult to tie the goods tightly. The binder can quickly and easily bundle the goods, so it is widely used now and is popular among logistics staff.

 At present, the binder used in logistics and transportation is assembled from parts such as a body, a handle, a ratchet, a reel, a handle, a gear plate, a webbing, a hook, and a clutch spring. The entire binding has two hooks, a positioning strap hook and a movable strap hook. The positioning strap hook is fixed to the outer end of the positioning strap, and the inner end of the positioning strap is fixed to the body. The movable hook is fixed to the outer end of the movable belt, and the inner end of the movable belt is wound on the reel. As the reel rotates, the movable belt can be elongated or shortened, thereby achieving binding. Specifically, the winding of the movable belt is realized by: pulling the handle, the side piece of the handle can be rotated around the reel, and the one-way ratchet is rotated by the handle on the side piece, since the ratchet and the reel are fixed, so that Gradually roll up the activity belt. The extension of the movable belt is achieved by pulling the handle away from the ratchet, and the movable belt drives the reel to rotate in the opposite direction under the action of the pulling force to achieve quick release.

For information on the binder, for example, the Chinese patent publication discloses a binding device that can adjust the speed of the loose belt [Chinese Patent Application No.: 200610028900. 2; publication number: CN1887617A], including a body and a handle, and the end of the body is fixedly positioned. Belt, positioning The outer end of the belt is provided with a positioning hook, the side panel of the body and the side panel of the handle are hinged by a reel, the two ends of the reel are respectively provided with a ratchet, the movable belt is wound on the reel, and the outer end of the movable belt is provided with a movable hook. The body is movably connected with a gear plate that can cooperate with the ratchet, and a handle that can cooperate with the ratchet is movably connected to the handle, and the side plate of the body is provided with a notch that can cooperate with the ratchet. The side piece body is provided with a sloped surface; when the handle end is in the notch, the gear plate is at the upper part of the inclined surface, so that the gear plate is disengaged from the ratchet ratchet.

 The binder of the above structure is capable of stably and securely binding the goods, but there are still some drawbacks. When the binder is used, most of the tape is located outside the body, and it is often necessary to wind the tape onto the reel for easier storage. The existing binding device rewinding and winding process is to pull the handle, drive the rotating shaft to rotate and rewind the winding tape. Since the pulling handle reciprocates once, the arc of the rotating shaft is small, so that the length of the reeled winding tape is limited. This must be repeated until the winding of the tape is completed. Obviously, the winding method has the problem that the reel cannot be continuously rotated, that is, it is time-consuming and labor-intensive, and the winding efficiency is low. Summary of the invention

 SUMMARY OF THE INVENTION An object of the present invention is to provide the above-described problems with respect to the prior art, and to provide a binding device capable of automatically winding a web of the outer wrap.

 The object of the present invention can be achieved by the following technical solutions: a binding device comprising a body, a handle, a reel, a handle and a body hinged by a reel, the reel having a ratchet fixed thereon and a winding tape wound, The handle is slidably connected with a handle, and the end of the handle can be inserted between the ratchets of the ratchet, the body is slidably connected with a baffle, and the end of the baffle can be inserted between the ratchets of the ratchet, characterized in that the reel and A coil spring is disposed between the bodies, and an inner end of the coil spring is connected to the reel, and an outer end of the coil spring is connected to the main body, and the reel has a tendency to rotate in a winding reel direction under the action of the spring force of the coil spring.

The binding device has a disengagement groove. When the end of the handle is located in the disengagement groove, the end of the handle and the end of the baffle are separated from the ratchet of the ratchet, and the reel is pulled to release the reel from the reel and drive the reel to rotate. Driving the coil spring to rotate the coil spring gradually. When loose After unwinding the tape, the coil spring gradually relaxes under the action of its own elastic force and drives the reel to reverse, thereby winding the reel back onto the reel and the coil spring can continuously rotate the reel, thereby greatly improving the efficiency of winding the reel. .

 In the above-mentioned binding device, a clutch mechanism is further disposed between the body and the reel, and the clutch mechanism can generate a resistance against the spring force of the coil spring when closed. The clutch mechanism is normally in an engaged state and is capable of positioning the spool on the body against the spring force of the coil spring, and is capable of forcing the clutch mechanism to separate when the tape is subjected to the pulling force of the outward pulling, whereby the tape can be removed from the spool freed. When the clutch mechanism is manipulated to be in a disengaged state, the reel is rotated in the direction of the winding reel by the spring force of the coil spring, thereby continuously winding the reel. At the same time, it is possible to control the timing of manipulating the clutch mechanism, thereby controlling the length of the reel to wind up the reel under the action of the coil spring force.

 In the above-mentioned binding device, the clutch mechanism includes a clutch ratchet fixed to the reel and a pawl hinged on the body to be inserted between the ratchet teeth of the clutch ratchet, and a pawl head is provided between the pawl and the body A spring with a tendency to move between the ratchets of the clutch ratchet. The pawl and the clutch ratchet should be in an engaged state during the fixed connection of the web; the pawl and the clutch ratchet should be in a separated state during winding and unwinding and during the winding of the web.

In the above-mentioned binding device, the resistance generated by the clutch mechanism is friction. In the above-mentioned binding device, the clutch mechanism includes a clutch piece 1 fixed on the reel and a clutch piece 2 on one side of the clutch piece, and the clutch piece is circumferentially fixed on the body, in the clutch piece 2 A clutch spring is disposed between the body and the body to which the clutch piece 2 is attached to the clutch piece. The clutch mechanism only includes the clutch piece 1, the clutch piece 2 and the spring, thereby having the advantages of simple structure and reasonable design. When the reel is pulled, the reel is released from the reel, and the reel is rotated by the reel, which in turn drives the coil spring to rotate and the coil spring is gradually tensioned. At the same time, the reel drives the clutch to rotate, forcing the clutch to overcome the clutch and the clutch. The friction between the clutch plates 2 moves axially and disengages from the clutch plate one; at this time, the clutch mechanism is in a separated state, and the rotating shaft can rotate freely. When the tape is stopped, the clutch piece 2 is reattached under the action of the clutch spring. At this time, the clutch mechanism is in the engaged state, and the rotating shaft is locked and cannot be rotated; thereby effectively preventing the During the pulling of the tape, the reel is reversed by the coil spring and the tape is wound back onto the reel.

 In the above-mentioned binding device, both ends of the reel are passed through the body, the inner end of the coil spring is connected to one end of the reel, and the clutch piece is fixed on the other end of the reel, and the clutch piece 2 is located at the clutch. Between the first piece and the body, one end of the clutch spring abuts against the body, and the other end abuts against the clutch piece 2. The coil spring and the clutch mechanism are respectively connected at the two ends of the reel, that is, respectively on both sides of the main body, so that the components of the bundle are arranged more rationally and the structure is more compact.

 In order to increase the friction between the clutch piece 1 and the clutch piece 2, one of the following solutions can be implemented:

 The first solution: in the above-mentioned binding device, the clutching surface of the clutch plate 2 is evenly distributed with a plurality of clutch grooves in the circumferential direction, and the clutch plate has a clutch groove on the clutch plate 2 The positions correspond one-to-one and can be inserted into the clutch bumps in the clutch groove. The clutch groove and the clutch bump are each called a hemispherical shape, so that the clutch bump and the clutch groove are more easily separated from each other, and even if the clutch piece 2 is more easily separated from the clutch piece. The above-mentioned clutch bump and the clutch groove are both obtained by press forming, thereby having the advantages of convenient processing of the clutch piece 1 and the clutch piece, and low production cost. Therefore, it is inevitable that the bump is formed at the same time when the clutch groove is press-formed, and the bump has a function of positioning the above-described clutch spring.

 The second solution: in the above-mentioned binding device, a plurality of clutch grooves are evenly distributed in the circumferential direction on the bonding surface of the clutch piece 1 , and the clutch plates on the clutch plate 2 are distributed with the clutch grooves on the clutch plate 1 The positions correspond one-to-one and can be inserted into the clutch bumps in the clutch groove.

 The third solution: In the above-mentioned binding device, the friction surface is fixed to the bonding surface of the clutch piece 1 and the bonding surface of the clutch piece 2. The friction plate can be made of rubber or the like, and the friction coefficient between the bonding surface of the clutch piece 1 and the bonding surface of the clutch piece 2 is much larger than that between the clutch piece 1 and the clutch piece 2 The coefficient of friction of direct contact.

In the above-mentioned binding device, the clutch cover is provided with a cover 1 fixed to the main body, and the clutch cover is circumferentially fixed on the cover 1; A button is provided thereon, and the inner end of the button abuts against the clutch piece 2, and when the manipulation button can disengage the clutch piece 2 from the clutch piece 1. According to the above structure, the clutch piece 1, the clutch piece 2 and the clutch spring are all located in the box cover, whereby the box cover can effectively protect the function of the clutch device. The operating button can move the clutch piece 2 away from the clutch piece 1 along the axial direction of the reel, and then the clutch piece 2 compresses the clutch spring; when the operation button is terminated, the clutch piece 2 is again attached to the clutch piece under the elastic force of the clutch spring. .

 In the above-mentioned binding device, the coil spring cover is provided with a cover 2 fixed to the body. The box cover 2 can effectively protect the function of the coil spring.

 In the above-mentioned binding device, the outer wall of the body is fixed with a casing, and the casing 1 and the casing cover 2 are fixed to the casing. The above-mentioned box body, box cover 1 and box cover 2 can all be made of plastic materials of different colors, so that the appearance of the product is more beautiful.

 Compared with the prior art, the binder has the following advantages:

 1. The bundle is provided with a coil spring which makes the reel always have the tendency of winding the reel, thereby realizing the function of the reeling of the automatic winding, and the reel can continuously rotate under the elastic force of the coil spring, thereby saving the collection. The time of winding the tape increases the efficiency of winding.

 2. The clutch mechanism is set on the binding device, and the clutch mechanism can control the rotation and stop of the reel, thereby effectively controlling the tension and slack of the coil spring, that is, the time for winding the reel under the elastic force of the coil spring can be controlled. And length, etc.

 3. The clutch mechanism in the binding device has the advantages of simple structure and reasonable design.

4. The binder also has the advantages of reasonable layout, long service life and beautiful appearance of the product. DRAWINGS

 Figure 1 is a schematic perspective view of the bundler.

 2 is a schematic perspective view of another perspective view of the binder.

 Figure 3 is a schematic cross-sectional view of the binder.

Fig. 4 is a structural schematic view showing a portion of Fig. 3 partially enlarged and the clutch mechanism in a separated state. Figure 5 is a schematic view showing the structure of a second embodiment of the clutch mechanism in the binder.

 Figure 6 is a schematic view showing the structure of a third embodiment of the clutch mechanism in the binder.

In the figure, 1, the body; l _a , the escape groove; lb, the locking groove; 2, the ratchet; 3, the tape; 4, the handle; 5, the box; 5a, the opening; 6, the handle; 7, the spring; , reel; 9, clutch piece 1; 9a, clutch bump; 10, clutch piece 2; 10a, clutch groove; 1 1, clutch spring; 12, box cover; 13, button; 14, coil spring; Cover two; 16, positioning ribs; 17, grooves; 18, friction plates. detailed description

 The technical examples of the present invention are further described below with reference to the specific embodiments of the present invention, but the present invention is not limited to the embodiments.

 As shown in Fig. 1, Fig. 2 and Fig. 3, the binder includes a body 1, a handle 4, a reel 8, a ratchet 2, a reel 3, a handle 6, a coil spring 14, and a clutch mechanism.

Specifically, the handle 4 and the body 1 are hinged by a reel 8, and the ratchet 2 is fixed to the reel 8; the reel 3 is wound around the reel 8. The handle 6 is slidably coupled to the handle 4, and the end of the handle 6 can be inserted between the ratchets of the ratchet 2, and between the handle 6 and the handle 4, the end portion of the handle 6 is always provided with a tendency to slide between the ratchets of the embedded ratchet 2. Reset the clutch spring 1 1. The baffle is slidably coupled to the body 1, and the end of the baffle can be inserted between the ratchets of the ratchet 2, and the baffle and the body 1 are disposed such that the end of the baffle always has a tendency to slide between the ratchets embedded in the ratchet 2. Reset the clutch spring 1 1. When the end of the handle 6 is inserted between the ratchets of the ratchet 2, the end of the baffle is also inserted between the ratchets of the ratchet 2, and the handle 4 is pulled to drive the reel 8 to rotate, thereby winding the reel 3 onto the reel 8. The body 1 is provided with a locking groove lb. When the end of the handle 6 is located in the locking groove lb, the end of the handle 6 and the end of the baffle are still embedded between the ratchets of the ratchet 2, and the reel 8 is locked. The belt 3 is also locked. The body 1 is provided with a disengagement groove la. When the end of the handle 6 is located in the disengagement groove la, the end of the handle 6 and the end of the baffle are separated from the ratchet of the ratchet 2, and the reel 3 is pulled to make the reel 3 from the reel 8. Release and drive the reel 8 to rotate. As shown in FIG. 3, the coil spring 14 is located outside the body 1, and both ends of the reel 8 pass through the body 1. The inner end of the coil spring 14 is fixed to one end of the reel 8, and the outer end of the coil spring 14 and the body 1 are Connected, the reel 8 always has a tendency to wind up the reel 3 under the elastic force of the coil spring 14. Thereby, when the tape 3 is released from the reel 8, the reel 8 is rotated, and the coil spring 14 is gradually tensioned; on the contrary, under the elastic force of the coil spring 14, the reel 8 can be rotated, and the reel 3 is wound up. On the reel 8, at the same time, the coil spring 14 is gradually relaxed.

 Also provided on the body 1 is a clutch mechanism that is coupled to the spool 8 and that is capable of locking the spool 8. The rotation of the reel 8 is restricted by the present clutch mechanism, thereby effectively controlling the tension and slack of the coil spring 14, i.e., controlling the time and length of winding the web 3 under the elastic force of the coil spring 14, and the like.

 As shown in FIG. 3 and FIG. 4, the clutch mechanism includes a clutch piece 9 fixed to the other end of the reel 8 and a clutch piece 2 10 between the clutch piece 9 and the body 1. The clutch piece 9 can be fixed by screws. On the reel 8, the clutch piece 9 can also be riveted and fixed to the reel 8. The clutch plate is fixed to the main body 1 at a circumferential direction of 10, and a clutch spring 1 1 for attaching the clutch plate 20 to the clutch piece 9 is disposed between the clutch plate 10 and the body 1; the end of the clutch spring 1 1 abuts On the body 1, the other end abuts against the clutch plates 20.

 A plurality of clutch grooves 10a are uniformly distributed along the circumferential direction of the core of the reel 8 on the bonding surface of the clutch plate 10, and the clutch plates 9 are distributed in one-to-one correspondence with the positions of the clutch grooves 10a on the clutch plates 10 and capable of The clutch bumps 9a embedded in the clutch grooves 10a are provided with the clutch bumps 9a and the clutch grooves 10a to increase the frictional force between the two in the circumferential direction. The clutch groove 10a and the clutch projection 9a are each referred to as a hemispherical shape, so that the clutch projection 9a and the clutch groove 10a are more easily detached from each other, and even if the clutch piece 20 is more easily detached from the clutch piece -9. The above-described clutch projection 9a and the clutch groove 10a are both obtained by press forming, thereby having the advantages of facilitating the processing of the clutch sheet 9 and the clutch sheet 20, and having a low production cost. Thereby, it is inevitable to simultaneously form a bump when the clutch groove 10a is press-formed, and the bump has a function of positioning the above-described clutch spring 1 1.

In addition, according to the actual situation of the clutch mechanism, in order to increase the clutch piece 9 and the clutch piece The friction between the two 10 can also be implemented by one of the following solutions: The first solution: As shown in FIG. 5, the clutch surface of the clutch piece 9 is evenly distributed with a plurality of clutch grooves 10a in the circumferential direction. The clutch plates 20 are distributed with the clutch bumps 9a which are in one-to-one correspondence with the positions of the clutch grooves 10a on the clutch plates 9 and which can be inserted into the clutch grooves 10a.

 The second solution: As shown in Fig. 6, the friction surface 18 is fixed to the bonding surface of the clutch piece 9 and the bonding surface of the clutch piece 20. The friction plate 18 can be made of a rubber material, and the sliding friction coefficient between the bonding surface of the clutch piece 9 and the bonding surface of the clutch piece 20 will be much larger than that of the clutch piece 9 and Clutch piece two

 The coefficient of sliding friction between direct contact between 10.

 A casing 5 made of a plastic material is fixed to the outer wall of the body 1, and the casing 5 has an opening 5a through which the winding tape 3 passes. The width of the opening 5a is adapted to the width of the web 3, and the opening 5a can prevent the winding of the web 3 from being entangled during winding.

 The cover piece 9 is provided with a cover 12 which is fastened to the case 5, and thus, the clutch piece 10 and the clutch spring 1 1 are also located in the case cover 12. A groove 17 is formed on the outer edge of the clutch plate 12, and a positioning rib 16 is disposed on the inner wall of the cover 12, and the positioning rib 16 is embedded in the groove 17. Therefore, the clutch piece 10 is circumferentially The fixing is fixed on the box cover 12. A button 13 is disposed on the box cover 12, and the inner end of the button 13 abuts against the clutch piece 10, and the operation button 13 can move the clutch piece 20 in the axial direction of the reel 8 away from the clutch piece 9, and then the clutch piece 2 10Compressing the clutch spring 1 1 ; When the operation button 13 is terminated, the clutch piece 2 is again attached to the clutch piece 9 by the elastic force of the clutch spring 1 1 . Thereby, the cartridge cover 12 can effectively protect the clutch device. Similarly, in order to better protect the coil spring 14, the cover spring 14 is provided with a cartridge cover 15 fixed to the casing 5. The box body 5, the box cover 12, and the box cover 2 can be made of different colors of plastic materials, so that the appearance of the product is more beautiful.

 The specific use of the tensioner bundled goods is as follows: First, place the tensioner in place and attach it securely.

Then, the connection tape 3 is fixedly attached. Adjust the end of the handle 6 to the disengagement slot la, Pulling the tape 3, the tape 3 is released from the spool 8 and the outer end of the tape 3 is fixedly attached to a suitable position. During this process, the reel 8 is rotated by the reel 3, which in turn drives the coil spring 14 to rotate to gradually tension the coil spring 14; at the same time, the clutch mechanism makes an intermittent clutch, that is, the reel 8 drives the clutch piece 9 to rotate, thereby forcing the clutch The sheet 2 is axially moved away from the clutch piece 9; and when the winding of the web 3 is stopped, the clutch piece 2 10 is re-fitted under the action of the clutch spring 11, thereby effectively preventing the reel 8 from appearing during the pulling of the web 3. The phenomenon in which the coil spring 14 is reversed by the action of the spring 7 of the coil spring 14 rewinds the take-up reel 3 onto the reel 8.

 Next, tighten the tape 3 to complete the bundled goods. Adjust the handle 6 position and pull the handle 4 until the tape 3 is in tension and adjust the handle 6 again so that the end of the handle 6 is in the locking groove lb; thus, the goods are securely and stably bundled.

 Finally, loosen and wind up the tape. The position of the handle 6 is adjusted so that the end of the handle 6 is located in the disengagement groove la, and the button 13 is pressed until the clutch piece 12 is disengaged from the clutch piece 9. At this time, the coil spring 14 gradually relaxes under the action of the spring 7 and drives the reel 8 to reverse. Further, the take-up reel 3 is wound up onto the reel 8, thereby greatly facilitating the winding of the reel 3, which effectively saves time.

 The specific embodiments described herein are merely illustrative of the spirit of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described, or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope.

 Although the body 1 is used more frequently; the detachment groove la; the locking groove lb; the ratchet 2; the tape 3; the handle 4; the case 5; the opening 5a; the handle 6; the spring 7; the reel 8; the clutch piece 9; Clutching lug 9a; clutching lug 2; clutching groove 10a; clutch spring 11; box cover 12; button 13; coil spring 14; box cover 15; positioning rib 16; groove 17; friction plate 18, etc. However, the possibility of using other terms is not excluded. These terms are only used to describe and explain the nature of the invention more conveniently; it is inconsistent with the spirit of the invention to interpret them as any additional limitation.

Claims

Claim 1. A binding device comprising a body (1), a handle (4), a reel (8), a handle (4) and a body (1) hinged by a reel (8), the reel (8) being fixed The ratchet wheel (2) and the winding tape (3) are wound, and the handle (4) is slidably connected with a handle (6), and the end of the handle (6) can be inserted between the ratchets of the ratchet wheel (2), The body (1) is slidably connected with a baffle, and the end of the baffle can be inserted between the ratchets of the ratchet (2), characterized in that a coil spring is arranged between the reel (8) and the body (1) (14), the inner end of the coil spring (14) is connected to the reel (8), the outer end of the coil spring (14) is connected to the body (1), and the reel (8) is elastically acted upon by the coil spring (14) There is a tendency to rotate in the direction of the winding tape (3).  2. The binding device according to claim 1, wherein a clutch mechanism is further disposed between the body (1) and the reel (8), and the clutch mechanism can generate a overcome when closed The coil spring (14) has a resistance to spring force.  3. The binding device according to claim 2, wherein the clutch mechanism comprises a clutch ratchet fixed to the reel (8) and a spine hinged on the body (1) to be inserted between the ratchets of the clutch ratchet The pawl is provided between the pawl and the body (1) with a spring that causes the pawl head to have a tendency to move between the ratchets of the clutch ratchet.  4. The binding device according to claim 2, wherein the resistance generated by the clutch mechanism is a frictional force.  The binding device according to claim 3, wherein the clutch mechanism comprises a clutch piece (9) fixed to the reel (8) and a clutch piece 2 on the side of the clutch piece (9). (10), the clutch piece 2 (10) is disposed on the body (1) and the clutch piece 2 (10) is movable along the axial direction of the reel, and is disposed between the clutch piece 2 (10) and the body (1) There is a clutch spring (11) that fits the clutch piece (10) to the clutch piece (9). The binding device according to claim 5, wherein both ends of the reel (8) pass through the body (1), and the inner end of the coil spring (14) and the reel (8) One end of the clutch piece (9) is fixed on the other end of the reel (8), and the above-mentioned clutch piece (10) is located between the clutch piece (9) and the body (1), and the above-mentioned clutch spring (11) ) One end abuts against the body (1) and the other end abuts on the clutch plate (10).  The binding device according to claim 5 or 6, wherein the engaging surface of the clutch plate (10) is evenly distributed with a plurality of clutch grooves (10a) in a circumferential direction, and the clutch plate is One (9) is distributed with a clutch bump (9a) which is in one-to-one correspondence with the position of the clutch groove (10a) on the clutch piece (10) and which can be inserted into the clutch groove (10a).  The binding device according to claim 5 or 6, wherein the engaging surface of the clutch piece (9) is evenly distributed with a plurality of clutch grooves (10a) in the circumferential direction, and the clutch piece is The second (10) is distributed with a clutch bump (9a) which is in one-to-one correspondence with the position of the clutch groove (10a) on the clutch piece (9) and which can be inserted into the clutch groove (10a).  The binding device according to claim 5 or 6, wherein the friction surface of the bonding surface of the clutch piece (9) and/or the bonding surface of the clutch piece (10) is fixed (18).  The binding device according to claim 5 or 6, wherein the clutch cover (9) outer cover is provided with a box cover (12) fixed to the body (1), and the above-mentioned clutch piece 2 (10) circumferentially fixed on the box cover (12); (12) is provided with a button (13), the inner end of the button (13) abuts against the clutch piece (10), and when the manipulation button (13) can disengage the clutch piece (10) from the clutch piece (9) The coil spring (14) outer cover is provided with a box cover (15) fixed to the body (1).