TWI532573B - Tool changer with any length without adjustment function - Google Patents

Description

Tool connector with any stepless length adjustment function

The invention mainly discloses a tool joint, in particular a tool joint having any function of stepless adjustment length.

Please refer to the "Tool Joint Structure Improvement" patent of the Chinese Patent No. I285582, which is an improved tool joint structure, comprising: a joint body having a long perforation through which the tool head can be inserted, and the joint body has a first end and a second end, the first end is for coupling to the tool grip; a first clamping device is rotatably disposed at the second end of the joint body, and has a detachable a clamping member in the long perforation; a second clamping device disposed axially reciprocally at the second end of the joint body, and having a latch member that can be immersed into the long perforation; when the tool head penetrates Within the long perforations, the cassettes of the two jaw devices can be snapped individually or simultaneously.

However, since the tool joint adopting the above structure is provided with the first jaw device and the second jaw device at the same time, the front end of the tool joint is bulky, which is disadvantageous for the tool joint to penetrate into the slit, resulting in the tool joint. Unable to drive work in a small space.

In view of the above-described deficiencies in the conventional structure, the inventors have invented a tool joint having any stepless length adjustment function which overcomes all of the disadvantages of the above-described conventional structure.

The utility model has the tool joint of any stepless length adjustment function, and the main purpose thereof is to provide a tool joint comprising a body and an extension rod, the body having a first end and a second portion different from the first end The first end of the body can be connected to the tool grip, and the body is provided with a through hole. The body is provided with a latching device at the second end, and the latching device of the body includes a first sleeve and At least one first latch member movable between a locked position and a released position, one end of the extension rod being movably inserted into the through hole of the body relative to the body and the extension rod being different The other end protrudes out of the perforation of the body, and the extension rod is different from the end of the body to connect the tool head. When the first sleeve is in the locking position, the first sleeve pushes the first latching protrusion Inserting the perforation and abutting against the extension rod, the extension rod cannot move relative to the body. When the first sleeve is in the release position, the first sleeve releases the first latch member to exit the perforation, and the extension rod can phase Moving the body, above the tool joint by extending the rod relative to the body can be designed to achieve the function of adjusting the length of movement, in order to facilitate operations performed in the slot space.

The extension rod is different from the one end of the body and is provided with a slot in the axial direction. The slot extends in the direction of the body, and the extension rod is provided with a latching device at one end of the body, the extension rod is The latching device includes a second sleeve and at least one second latching member, the second sleeve being movably coupled to the outer peripheral edge of the extension rod in a radial direction between the locked position and the released position, the second sleeve When the cylinder is in the locking position, the second sleeve pushes the second latching member into the slot, and when the second sleeve is in the releasing position, the second sleeve releases the second latching member to withdraw the plugging groove.

The body includes a first shell and a second shell, the first shell being adjacent to the first end of the body and connectable to the tool grip, the second shell being selectively rotatably sleeved relative to the first shell The first shell has a radially outer periphery.

The second shells are three equidistantly spaced apart from each other in the radial direction and are provided with a first positioning concave edge and a second positioning concave edge. The through grooves of the second shell communicate with the through hole and the second a radially outer periphery of the shell, a first positioning recess of the second shell and a second positioning recess of the second shell respectively located on opposite sides of the second shell, the second shell The two positioning recesses are located between the through slots of the second shell and the second end, the number of the at least one first latching member is three, and the three first latching members are respectively disposed on the third of the second shell The latching device of the body has two first stoppers, a first buckle and a first elastic member, and one side of the first stopper is inserted into the second shell A first side of the positioning recess and the different side of the first housing are exposed outside the first positioning recess of the second housing, the first sleeve surrounding the first stop is different from the side of the second housing. One side of the first buckle is inserted into the second positioning concave edge of the second shell and the other side is exposed outside the second positioning concave edge of the second shell, the first sleeve and the first sleeve The An elastic member is located between the first stopper and the first buckle, and one end of the first elastic member is pushed against the first stopper and the other end of the first elastic member pushes the first sleeve. When the first sleeve is in the locked position, the first sleeve abuts against the first buckle, and when the first sleeve is in the release position, the first sleeve is disengaged from the first buckle.

The extension rod is different from the one end of the body, and is provided with three through slots at equal intervals in the radial direction and is provided with a first positioning groove and a second positioning groove. The slot of the extension rod communicates with the slot. a slot and a radially outer periphery of the extension rod, wherein the first positioning groove of the extension rod and the second positioning groove of the extension rod are respectively located on opposite sides of the extending rod of the extension rod, the extension rod The first positioning groove is located between the slot of the extension rod and the body, the number of the at least one second latching member is three, and the three second latching members are respectively disposed on the three slots of the extending rod The latching device of the extension rod has two second stops, a second buckle and a second elastic member. One side of the second stopper is inserted into the first positioning concave of the extension rod. The other side of the slot is different from the first positioning groove of the extension rod. The second sleeve is different from the side of the extension rod around the second stopper, and one side of the second buckle is inserted into the second positioning groove of the extension rod and the other side is different Exposed on the second positioning groove of the extension rod, the second sleeve and the second elastic member are located between the second stopper and the second buckle, and one end of the second elastic member is pushed Pushing the second sleeve against the second stop and the other end, the second sleeve is in the locked position, the second sleeve abuts against the second buckle, the second sleeve The second sleeve is disengaged from the second buckle when in the released position.

The first sleeve is reciprocally linearly coupled between the locked position and the released position to an outer circumference of the second casing radial direction, and the second sleeve is reciprocally linearly movable between a locked position and a released position.

The first stop member has an arc-shaped elongated strip shape, and the second stopper member has an arc-shaped elongated strip shape. The through hole penetrates the first end and the second end of the body, and the slot penetrates the extension rod.

The outer circumference of the first shell on the radially opposite sides is respectively pivoted with a ratchet block, the second shell is adjacent to the second end of the body, and the second shell is provided with a radially inner peripheral ring a ring tooth portion, the ring tooth portion being engageable with one of the two ratchet blocks or both.

The first shell is provided with a passage between the two ratchet blocks, and a compression spring is disposed in the passage, and the opposite ends of the compression springs in the passage respectively abut against the two ratchet blocks.

The first shell is concavely disposed with a receiving groove in a radially outer periphery. The receiving groove is sequentially provided with a compression spring and a steel ball from the inside and the outside, and the opposite ends of the compression spring in the receiving groove respectively abut The bottom surface of the pocket and the steel ball have a control ring, and the control ring is rotatably sleeved on the outer circumference of the first shell relative to the first shell, and the control ring is radially The peripheral recess is provided with two first positioning grooves and a second positioning groove. The second positioning groove is located between the two first positioning grooves, and the control ring can be selected while rotating relative to the first housing. Sexually inserting the steel ball into the first set a groove or the second positioning groove, when the steel ball is inserted into the first positioning groove, one of the two ratchet blocks engages the ring tooth portion and the other breaks away from the ring tooth portion when the steel ball When the second positioning groove is inserted, the two ratchet blocks simultaneously engage the ring tooth portion.

Other objects, advantages and novel features of the invention will become apparent from the description and appended claims.

10‧‧‧Tool connector

20‧‧‧ body

21‧‧‧ first end

22‧‧‧ second end

23‧‧‧Perforation

24‧‧‧ first shell

241‧‧‧ ratchet block

242‧‧‧ channel

243‧‧‧Compression spring

244‧‧‧ 容容

245‧‧‧Compression spring

246‧‧‧ steel balls

25‧‧‧ second shell

251‧‧‧ Ring tooth

252‧‧‧through slot

253‧‧‧First positioning concave edge

254‧‧‧Second positioning concave edge

26‧‧‧Carton device

261‧‧‧First sleeve

262‧‧‧First card condition

263‧‧‧First stop

264‧‧‧First buckle

265‧‧‧First elastic parts

27‧‧‧Control loop

271‧‧‧First positioning groove

272‧‧‧Second positioning groove

30‧‧‧Extension rod

31‧‧‧ slots

32‧‧‧through slot

33‧‧‧First positioning groove

34‧‧‧Second positioning groove

35‧‧‧Carton device

351‧‧‧Second sleeve

352‧‧‧Second card condition

353‧‧‧Second stop

354‧‧‧second buckle

355‧‧‧Second elastic parts

90‧‧‧Tool head

Figure 1 is a perspective view of a tool joint having any stepless length adjustment function of the present invention.

Figure 2 is an exploded perspective view of the tool joint of the present invention having any stepless length adjustment function.

Fig. 3 is an exploded perspective view of the tool joint body having the function of any stepless adjustment length of the present invention.

Fig. 4 is an exploded perspective view showing another perspective of the tool joint body having any stepless length adjustment function of the present invention.

Fig. 5 is a cross-sectional structural view showing a tool joint having an arbitrary stepless length adjustment function according to the present invention.

Fig. 6 is a cross-sectional structural view showing the tool joint body having any function of no step length adjustment according to the present invention.

Fig. 7 is a cross-sectional structural view showing the tool joint body having the function of any stepless adjustment length of the present invention.

Figure 8 is a cross-sectional structural view of the tool joint body having the function of any stepless adjustment length of the present invention.

Figure 9 is a cross-sectional structural view taken along line 9-9 of Figure 8 of the present invention.

Fig. 10 is a motion diagram of the rotation of the tool joint control ring having the function of any stepless adjustment length according to the present invention.

Figure 11 is an action diagram of the rotation of the tool joint control ring having the function of any stepless adjustment length of the present invention.

Fig. 12 is a motion diagram of the rotation of the tool joint control ring having the function of any stepless adjustment length according to the present invention.

Figure 13 is an action diagram of the rotation of the tool joint control ring having the function of any stepless adjustment length according to the present invention.

Figure 14 is a cross-sectional structural view of the tool joint extension rod having the function of any stepless adjustment length of the present invention.

Figure 15 is a cross-sectional structural view taken along line 15-15 of Figure 14 of the present invention.

Figure 16 is an operation diagram of the first latching device of the tool joint having the function of any stepless adjustment length of the present invention.

Fig. 17 is a view showing the action of the second latching device of the tool joint having the function of any stepless adjustment length of the present invention.

The technology, means and functions of the present invention are described in detail with reference to the accompanying drawings.

1 to 4, a perspective view, an exploded perspective view, and an exploded perspective view of a tool joint having any stepless length adjustment function according to the present invention. The tool joint 10 of the present invention comprises a body 20 and an extension rod 30; wherein: please continue to refer to FIG. 5, which is a cross-sectional structural view of the tool joint having any stepless length adjustment function according to the present invention. The body 20 has a first end 21 and a second end 22 that is different from the first end 21. The first end 21 of the body 20 can be coupled to a tool grip. A through hole 23 is formed in the body 20, and the through hole 23 penetrates the first end 21 and the second end 22 of the body 20.

Please refer to FIG. 6 and FIG. 7 for a cross-sectional structural view of the tool joint body having any stepless length adjustment function according to the present invention. The body 20 includes a first housing 24 and a second housing 25 adjacent to the first end 21 of the body 20 and connectable to a tool holder. The first housing 24 is radially different. A plurality of ratchet blocks 241 are respectively disposed on the outer peripheral edges of the two sides. The first shell 24 is provided with a passage 242 between the two ratchet blocks 241. The passage 242 is provided with a compression spring 243. The opposite ends of the compression spring 243 in the 242 abut against the two ratchet blocks 241, respectively.

The first shell 24 is recessed in the radial outer periphery with a receiving groove 244. The receiving groove 244 is sequentially provided with a compression spring 245 and a steel ball 246 from the inside to the outside. The compression spring 245 in the receiving groove 244 The opposite ends respectively abut against the bottom surface of the pocket 244 and the steel ball 246.

Please refer to FIG. 8 and FIG. 9 for a cross-sectional structural view of the tool joint body having any stepless length adjustment function. The second shell 25 is adjacent to the second end 22 of the body 20, and the second shell 25 is selectively rotatably sleeved on the outer periphery of the first shell 24 relative to the first shell 24, the second shell The radially inner peripheral ring is provided with a ring toothing portion 251 which is engageable with one of the two ratchet blocks 241 or both. The second shells 25 are vertically equidistantly spaced from each other with three through slots 252 and are provided with a first positioning recess 253 and a second positioning recess 254. The through slots 252 of the second shell 25 are connected. The through hole 23 and the outer peripheral edge of the second shell 25 are located, the first positioning concave edge 253 of the second shell 25 and the second positioning concave edge 254 of the second shell 25 are respectively located on the second shell 25 The second positioning recess 254 of the second shell 25 is located between the slot 252 of the second shell 25 and the second end 22 on opposite sides of the slot 252.

The body 20 is provided with a latching device 26 at the second end 22. The latching device 26 of the body 20 includes a first sleeve 261 and at least one first latching member 262. The first sleeve 261 can a reciprocating linearly movable connection between the locked position and the released position to the outer circumference of the second casing 25 in the radial direction The number of the at least one first latching member 262 in the embodiment is three, and the three first latching members 262 are respectively disposed in the three through slots 252 of the second shell 25 to selectively Enter or exit the perforation 23.

The latching device 26 of the body 20 further has two first stoppers 263, a first buckle 264 and a first elastic member 265. One side of the first stopper 263 is inserted into the second shell. The first positioning recess 253 of the second positioning recess 253 is exposed outside the first positioning concave edge 253 of the second housing 25, and the first stopping member 263 has an arc-shaped strip shape. A sleeve 261 surrounds the first stop 263 and is different from the side of the second shell 25 . One side of the first buckle 264 is inserted into the second positioning recess 254 of the second shell 25 and The first side of the first sleeve 261 and the first elastic member 265 are located outside the second positioning recess 254 of the second shell 25, and the first sleeve 261 and the first elastic member 265 are located at the first retaining member 263 and the first retaining ring Between 264, one end of the first elastic member 265 is pushed against the first stopper 263 and the other end is pushed to push the first sleeve 261.

Please refer to FIG. 10 to FIG. 13 again, which is an action diagram of the rotation of the tool joint control ring with any stepless length adjustment function according to the present invention. The main body 20 has a control ring 27 which is rotatably sleeved on the outer peripheral edge of the first casing 24 with respect to the first casing 24. The control ring 27 is recessed along the inner circumferential edge of the radial direction. Two first positioning grooves 271 and a second positioning groove 272 are located between the two first positioning grooves 271, and the control ring 27 rotates relative to the first casing 24 The steel ball 246 can be selectively inserted into the first positioning groove 271 or the second positioning groove 272, and when the steel ball 246 is inserted into the first positioning groove 271, one of the two ratchet blocks 241 The ring gear portion 251 is engaged and the other is disengaged from the ring tooth portion 251. When the steel ball 246 is inserted into the second positioning groove 272, the two ratchet blocks 241 simultaneously engage the ring tooth portion 251.

Please refer to FIG. 14 and FIG. 15 for a cross-sectional structural view of the tool joint extension rod having any stepless length adjustment function according to the present invention. One end of the extension rod 30 can be inserted into the through hole 23 of the body 20 relative to the body 20, and the other end of the extension rod 30 protrudes out of the through hole 23 of the body 20, and the extension rod 30 is different. A tool head is connected to one end of the body 20 and a slot 31 is defined in the axial direction. The slot 31 extends in the direction of the body 20 and extends through the extension rod 30.

The extension rod 30 is different from the one end of the body 20, and is provided with three through slots 32 at equal intervals in the radial direction, and is provided with a first positioning groove 33 and a second positioning groove 34. The extension rod is provided. The slot 32 of the slot 30 communicates with the outer periphery of the slot 31 and the extension rod 30. The first positioning groove 33 of the extension rod 30 and the second positioning groove 34 of the extension rod 30 are respectively located on the extension rod. The first positioning recess 33 of the extension rod 30 is located between the slot 32 of the extension rod 30 and the body 20 on the opposite sides of the slot 32 of the slot 30.

The extension rod 30 is disposed at one end of the body 20 with a latching device 35. The latching device 35 of the extension rod 30 includes a second sleeve 351 and at least one second latching member 352, the second The sleeve 351 is reciprocally linearly coupled to the outer peripheral edge of the extension rod 30 between the locked position and the released position, and the number of the at least one second latch member 352 in the embodiment is three, the three The second latching members 352 are respectively disposed in the three through slots 32 of the extension rod 30 to selectively enter or exit the slot 31.

The latching device 35 of the extension rod 30 further has two second stoppers 353, a second buckle 354 and a second elastic member 355. One side of the second stopper 353 is inserted into the extension rod. The other side of the first positioning groove 33 of the 30 is protruded from the first positioning groove 33 of the extension rod 30, and the second stopper 353 has an arc-shaped strip shape, the second The sleeve 351 is different from the side of the extension rod 30 around the second stopper 353. One side of the second buckle 354 is inserted into the second positioning concave of the extension rod 30. The other side of the slot 34 is protruded from the second positioning recess 34 of the extension rod 30. The second sleeve 351 and the second elastic member 355 are located at the second stopper 353 and the second Between the two buckles 354, one end of the second elastic member 355 is pushed against the second stopper 353 and the other end is pushed against the second sleeve 351.

Please refer to FIG. 16 and FIG. 17 for further operation of the tool joint latching device having any stepless length adjustment function according to the present invention. When the first sleeve 261 is in the locking position, the first sleeve 261 abuts against the first buckle 264, and the first sleeve 261 pushes the first latching member 262 to protrude into the through hole 23 and abut The extension rod 30 is incapable of moving relative to the body 20; when the first sleeve 261 is in the release position, the first sleeve 261 is disengaged from the first buckle 264, and the first sleeve 261 releases the The first latch member 262 exits the through hole 23, and the extension rod 30 is movable relative to the body 20.

When the second sleeve 351 is in the locked position, the second sleeve 351 abuts against the second buckle 354, and the second sleeve 351 pushes the second latching member 352 to protrude into the slot 31; When the second sleeve 351 is in the release position, the second sleeve 351 is disengaged from the second buckle 354, and the second sleeve 351 releases the second latch member 352 to exit the slot 31.

The tool connector 10 can insert the tool head 90 into the slot 31 for driving the tool connector 10 during use. Since the tool connector 10 adopts the above structure, the tool connector 10 can be extended by the extension rod 30 as a whole. The length of the tool head 90 drives the screw at the slit, and the extension rod 30 can be moved to any position according to the user's needs, so that the tool joint 10 can be adjusted to any length for convenient operation.

It can be summarized from the above that the present invention has the following advantages: 1. The tool joint of the present invention having any stepless length adjustment function, wherein the tool joint comprises a body and an extension rod, the body having a first end and a Different from the first a second end of the end, the first end of the body is connectable to the tool grip, the body is provided with a perforation, the body is provided with a latching device at the second end, and the latching device of the body comprises a first a sleeve and at least one first latch member movable between a locked position and a released position, one end of the extension rod being movably inserted into the through hole of the body relative to the body and the extension rod The opposite end protrudes out of the through hole of the body, the extension rod is different from the end of the body and can be connected to the tool head. When the first sleeve is in the locked position, the first sleeve pushes the first card The protrusion protrudes into the perforation and abuts against the extension rod, the extension rod cannot move relative to the body, and when the first sleeve is in the release position, the first sleeve releases the first latch member to exit the perforation, The extension rod is movable relative to the body, and the tool joint has the function of adjusting the length by the design that the extension rod can move relative to the body to facilitate work in the slit space.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, so that the numerical value is changed or the equivalent element is replaced, or the equivalent of the scope of the patent application of the present invention. Changes and modifications are still within the scope of the invention patent.

10‧‧‧Tool connector

20‧‧‧ body

21‧‧‧ first end

22‧‧‧ second end

23‧‧‧Perforation

24‧‧‧ first shell

25‧‧‧ second shell

26‧‧‧Carton device

261‧‧‧First sleeve

27‧‧‧Control loop

30‧‧‧Extension rod

35‧‧‧Carton device

351‧‧‧Second sleeve

Claims (10)

A tool joint having any stepless length adjustment function includes: a body having a first end and a second end different from the first end, the first end of the body being connectable to the tool a grip having a perforation disposed in the body, the body being provided with a latching device at the second end, the latching device of the body comprising a first sleeve and at least one first latching member, the first sleeve The cartridge is movable between a locked position and a released position; an extension rod, one end of the extension rod being movably inserted into the perforation of the body relative to the body, and the other end of the extension rod protruding from the body Outside the perforation, the extension rod is different from one end of the body and can be connected to the tool head; when the first sleeve is in the locking position, the first sleeve pushes the first latch member into the perforation and abuts the An extension rod that is incapable of moving relative to the body. When the first sleeve is in the release position, the first sleeve releases the first latch member to exit the perforation, and the extension rod is movable relative to the body. The tool joint of claim 1 , wherein the extension rod is different from the one end of the body and is provided with a slot in the axial direction, the slot extending in the direction of the body, the extension The rod is disposed at one end of the body with a latching device, and the latching device of the extending rod includes a second sleeve and at least one second latching member, the second sleeve being capable of being in a locked position and a released position Momentally connected to an outer peripheral edge of the extension rod in a radial direction. When the second sleeve is in the locking position, the second sleeve pushes the second latching member to protrude into the slot, and the second sleeve is in the slot When the position is released, the second sleeve releases the second latch member to exit the slot. The tool joint of claim 2, wherein the body comprises a first shell and a second shell, the first shell being adjacent to the first end of the body and capable of being connected Connected to the tool grip, the second shell is selectively rotatably sleeved relative to the first shell to a radially outer periphery of the first shell. The tool joint according to claim 3, wherein the second shell is vertically equidistantly spaced from each other by three slots and is provided with a first positioning recess and a first a positioning recess, the through slot of the second shell communicates with the through hole and the outer peripheral edge of the second shell, the first positioning concave edge of the second shell and the second positioning concave edge of the second shell are respectively located a second positioning recess of the second shell is located between the through slot of the second shell and the second end, and the number of the at least one first latching member is three The three first latching members are respectively disposed in the three slots of the second shell, and the latching device of the body has two first stops, a first buckle and a first elastic member. One side of the first stopper is inserted into the first positioning concave edge of the second shell and the other side is exposed outside the first positioning concave edge of the second shell, the first sleeve The sleeve surrounds the first stop member and is different from the side of the second shell, and one side of the first buckle is inserted into the second positioning concave edge of the second shell and is different The other side is exposed outside the second positioning concave edge of the second casing, and the first sleeve and the first elastic member are located between the first stopping member and the first buckle, the first elasticity One end of the piece is pushed against the first stop and the other end is pushed against the first sleeve. When the first sleeve is in the locked position, the first sleeve abuts against the first buckle. The first sleeve is disengaged from the first buckle when the first sleeve is in the release position. The tool joint of claim 4, wherein the extension rod is different from the one end of the body, and is equidistantly spaced from each other by three slots and is provided with a first ring. a positioning groove and a second positioning groove, the slot of the extension rod communicates with the slot and the outer peripheral edge of the extension rod, the first positioning groove of the extension rod and the second positioning concave of the extension rod The slots are respectively located on opposite sides of the slot of the extension rod, and the first positioning groove of the extension rod is located between the slot of the extension rod and the body, and the number of the at least one second latching member is three. The three second card members are respectively set Positioned in three slots of the extension rod, the locking device of the extension rod has two second stops, a second buckle and a second elastic member, one side of the second stopper Provided in the first positioning groove of the extension rod and the different other side is exposed outside the first positioning groove of the extension rod, the second sleeve is different from the extension around the second stopper One side of the rod, one side of the second buckle is inserted into the second positioning groove of the extension rod and the other side is exposed outside the second positioning groove of the extension rod, the second The sleeve and the second elastic member are located between the second stopper and the second buckle, and one end of the second elastic member is pushed against the second stopper and the other end of the second elastic member pushes the first a second sleeve, the second sleeve abuts against the second buckle when the second sleeve is in the locked position, and the second sleeve is disengaged from the second buckle when the second sleeve is in the release position. The tool joint of claim 5, wherein the first sleeve is reciprocally linearly coupled between the locked position and the released position to the outer circumference of the second casing radial direction, The second sleeve is reciprocally linearly movable between a locked position and a released position. The tool joint of claim 5, wherein the first stopper has an arc-shaped strip shape, and the second stopper has an arc-shaped strip shape, and the perforation is continuous. The first end and the second end of the body, the slot extending through the extension rod. The tool joint of claim 3, wherein the first shell is pivotally provided with a ratchet block adjacent to the outer periphery of the radially opposite sides, and the second shell is adjacent to the body. The second end of the second casing is provided with a ring tooth portion on the radially inner peripheral ring, the ring tooth portion being capable of engaging one of the two ratchet blocks or both. The tool joint of claim 8, wherein the first shell is provided with a passage between the two ratchet blocks, and a compression spring is disposed in the passage. The opposite ends of the compression spring abut against the two ratchet blocks, respectively. The tool joint according to claim 9, wherein the first shell is recessed with a pocket along a radially outer periphery, and the pocket is sequentially provided with a compression spring from the inside to the outside. And a steel ball, the opposite ends of the compression spring in the cavity respectively abut against the bottom surface of the cavity and the steel ball, the body has a control ring, and the control ring can be rotatably sleeved relative to the first shell a radial outer periphery of the first casing, wherein the control ring is recessed with two first positioning grooves and a second positioning groove along the inner circumferential edge, the second positioning groove is located at the two first Between the positioning grooves, the control ring can selectively insert the steel ball into the first positioning groove or the second positioning groove while rotating the first ring, when the steel ball is inserted into the first positioning groove One of the two ratchet blocks engages the ring tooth portion and the other member disengages from the ring tooth portion. When the steel ball is inserted into the second positioning groove, the two ratchet blocks simultaneously engage the ring tooth portion.