CN210830057U - Screw anti-dismounting device, anti-dismounting screw and screwdriver bit - Google Patents
Screw anti-dismounting device, anti-dismounting screw and screwdriver bit Download PDFInfo
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- CN210830057U CN210830057U CN201921565998.4U CN201921565998U CN210830057U CN 210830057 U CN210830057 U CN 210830057U CN 201921565998 U CN201921565998 U CN 201921565998U CN 210830057 U CN210830057 U CN 210830057U
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Abstract
The utility model is suitable for the technical field of anti-dismantling screws, and provides a screw anti-dismantling device, an anti-dismantling screw and a screwdriver bit, wherein the screw anti-dismantling device comprises the anti-dismantling screw and the screwdriver bit; the anti-dismantling screw comprises a screw rod and a screw cap integrally formed with one end of the screw rod, the screw cap is provided with at least three grooves distributed around the central axis of the screw cap and isolating parts for isolating the at least three grooves from each other, and the inner wall of each groove is provided with a first guiding part; the batch head comprises a batch head body and a boss which is arranged on the batch head body and matched with the groove, and the boss is provided with a second guide part matched with the first guide part. The anti-dismantling screw of the screw anti-dismantling device provided by the utility model can be opened only by the specific screwdriver head matched with the anti-dismantling screw, so that the user can be prevented from adopting the general screwdriver head to dismantle the anti-dismantling screw by self; and the buckling rate of the screwdriver head and the anti-dismounting screw is greatly improved, the alignment capability of the screwdriver head and the anti-dismounting screw is improved, and the alignment of the screwdriver head and the anti-dismounting screw is facilitated.
Description
Technical Field
The utility model relates to a prevent tearing open screw technical field, concretely relates to screw is prevented tearing open device, is prevented tearing open screw and criticizes head.
Background
In the electrical equipment of people daily use, in order to guarantee safety, some electrical equipment need use and prevent tearing open the screw, prevent that the user from dismantling by oneself. Such as: the converter shell of the non-disconnectable converter cannot be opened by a common tool, the flexible cable cannot be replaced, and the lead and the wiring terminal are permanently connected together by the anti-dismantling screw, so that a user cannot replace the flexible cable by himself.
In the prior art, the anti-dismantling screws mainly comprise Y-shaped groove screws, quincunx groove screws and square groove screws, and the Y-shaped groove screws, the quincunx groove screws and the square groove screws are all easily dismantled by universal screwdriver heads in a straight shape, a cross shape and the like; moreover, the anti-dismantling screw is not provided with a guide structure matched with the corresponding screwdriver head, so that the anti-dismantling screw is not convenient to align with the corresponding screwdriver head.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device is prevented tearing open by screw aims at solving prior art's the screw of preventing tearing open and is easily criticized the head and dismantle, and prevent tearing open the screw and criticize the first inconvenient problem of counterpointing with corresponding.
The utility model is realized in such a way that the screw anti-dismounting device comprises an anti-dismounting screw and a screwdriver head matched with the anti-dismounting screw;
the anti-dismantling screw comprises a screw rod with threads and a nut integrally formed with one end of the screw rod, the nut is provided with at least three grooves distributed at intervals around the central axis of the nut and isolating parts for isolating the at least three grooves from each other, and the inner wall of each groove is provided with a first guiding part;
criticize the head including criticizing the head body, locate criticize on the head body and with the boss that the recess cooperation set up, be equipped with on the boss with the second guide part that the cooperation of first guide part set up, the boss can be correspondingly put into be used for revolving in the recess and twist prevent tearing open the screw.
Preferably, the number of the grooves is 3-5.
Preferably, the number of the grooves is three, the three grooves are uniformly distributed around the central axis of the screw cap at intervals, and the included angle formed by the central lines of the two adjacent grooves is 120 degrees.
Preferably, the first guide part is a first inclined plane forming a preset included angle with the central axis of the nut, and the second guide part is a second inclined plane matched with the first inclined plane; or the first guide part is a first cambered surface, and the second guide part is a second cambered surface matched with the first cambered surface.
Preferably, the included angle between the first inclined plane and the central axis of the screw cap is 5-10 degrees, and the included angle between the second inclined plane and the central axis of the screwdriver bit body is 20-30 degrees.
Preferably, the recess includes the diapire, locates two first inner walls and the connection of the relative both sides of diapire two the second inner wall of first inner wall, first guide part is located on the second inner wall, first inner wall with the contained angle of diapire is 85 ~ 95.
The utility model also provides a prevent tearing open screw, including establish the screwed screw rod and with screw rod one end integrated into one piece's nut, the nut is equipped with the winding at least three recess that the axis of nut distributes and will the isolation portion that at least three recess kept apart each other, every the inner wall of recess is equipped with the first guide part that sets up with the cooperation of the second guide part of wholesale head.
Preferably, the first guide part is a first inclined plane forming a preset included angle with the central axis of the nut, and the second guide part is a second inclined plane matched with the first inclined plane; or the first guide part is a first cambered surface, and the second guide part is a second cambered surface matched with the first cambered surface.
The utility model also provides a criticize the head, including criticizing first body, with criticize first body integrated into one piece and with prevent tearing open the boss that the recess cooperation of the nut of screw set up, the boss be equipped with the second guide part that the cooperation of the first guide part of nut set up, the boss can correspond and put into be used for revolving in the recess and twist prevent tearing open the screw.
Preferably, the first guide part is a first inclined plane forming a preset included angle with the central axis of the nut, and the second guide part is a second inclined plane matched with the first inclined plane; or the first guide part is a first cambered surface, and the second guide part is a second cambered surface matched with the first cambered surface.
The screw anti-dismounting device provided by the utility model is provided with at least three grooves which are distributed at intervals around the central axis of the screw cap on the screw cap of the anti-dismounting screw, and is provided with an isolation part which isolates the at least three grooves from each other, because of the existence of the isolation part, universal screwdriver bits such as a straight line shape or a cross shape and the like can not be buckled into the grooves of the screw cap, only specific screwdriver bits which are matched with each groove of the anti-dismounting screw can be buckled into the grooves of the anti-dismounting screw, thereby preventing a user from adopting the universal screwdriver bits to dismount the anti-dismounting screw; simultaneously, through set up at least three recess on the nut of preventing tearing open the screw, improved the boss of criticizing the head greatly and prevented the lock rate of the recess of tearing open the screw, promoted the counterpoint ability of criticizing the head and preventing tearing open the screw. The inner wall of the groove of the anti-dismantling screw is provided with the first guide part, the boss of the screwdriver head is provided with the second guide part matched with the first guide part, and the boss of the screwdriver head can be smoothly clamped into the groove of the anti-dismantling screw under the guide effect of the mutual matching of the second guide part and the first guide part, so that the alignment of the screwdriver head and the anti-dismantling screw is facilitated.
Drawings
Fig. 1 is a three-dimensional structure diagram of a screw anti-detachment middle bit and an anti-detachment screw which are not matched according to a first embodiment of the present invention;
fig. 2 is a three-dimensional structure diagram of the screw anti-detachment middle bit and the anti-detachment screw in cooperation according to the first embodiment of the present invention;
fig. 3 is a schematic structural view of a screw anti-detachment middle bit and an anti-detachment screw according to a first embodiment of the present invention when the bit is engaged with the anti-detachment screw;
fig. 4 is a schematic structural view of a bit of a screw anti-removal device according to a first embodiment of the present invention;
fig. 5 is a schematic structural view of a disassembly-preventing screw of the screw disassembly-preventing device according to an embodiment of the present invention;
fig. 6 is a schematic structural view of another view angle of the anti-tamper screw of the screw anti-tamper device according to the first embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a tamper screw of a screw tamper device according to an embodiment of the present invention;
fig. 8 is a schematic structural view of a disassembly-preventing screw of the screw disassembly-preventing device according to the second embodiment of the present invention;
fig. 9 is a schematic structural view of another view angle of the anti-tamper screw of the screw anti-tamper device according to the second embodiment of the present invention;
fig. 10 is a schematic cross-sectional view of a tamper screw of a screw tamper device according to a second embodiment of the present invention;
fig. 11 is a schematic structural view of a disassembly-preventing screw of the screw disassembly-preventing device according to the third embodiment of the present invention;
fig. 12 is a schematic structural view of another view angle of the anti-tamper screw of the screw anti-tamper device according to the third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The screw anti-dismounting device provided by the embodiment of the utility model has the advantages that the at least three grooves which are distributed at intervals around the central axis of the nut are arranged on the nut of the anti-dismounting screw, and the isolating part which isolates the at least three grooves from each other is arranged, only the specific bits which are matched with the grooves of the anti-dismounting screw can be buckled into the grooves of the anti-dismounting screw, so that the user can be prevented from adopting the universal bits to dismount the anti-dismounting screw; simultaneously, through set up at least three recess on the nut of preventing tearing open the screw, improved the boss of criticizing the head greatly and prevented the lock rate of the recess of tearing open the screw, promoted the counterpoint ability of criticizing the head and preventing tearing open the screw. The inner wall of the groove of the anti-dismantling screw is provided with the first guide part, the boss of the screwdriver head is provided with the second guide part matched with the first guide part, and the boss of the screwdriver head can be smoothly clamped into the groove of the anti-dismantling screw under the guide effect of the mutual matching of the second guide part and the first guide part, so that the alignment of the screwdriver head and the anti-dismantling screw is facilitated.
Example one
Referring to fig. 1 to 7, an embodiment of the present invention provides a screw detachment prevention device, including a detachment prevention screw 1 and a bit 2 adapted to the detachment prevention screw 1.
The anti-dismantling screw 1 comprises a screw rod 11 provided with threads 10 and a screw cap 12 integrally formed with one end of the screw rod 11, the screw cap 12 is provided with at least three grooves 121 distributed at intervals around a central axis of the screw cap 12 and isolating parts 122 isolating the at least three grooves 121 from each other, and the inner wall of each groove 122 is provided with a first guiding part.
Criticize first 2 including criticizing first body 20, with criticizing first body 20 integrated into one piece and with the boss 21 of recess 121 cooperation setting, boss 21 is equipped with the second guide part that sets up with the cooperation of first guide part, and boss 21 can be correspondingly put into recess 121 and be used for revolving to twist and prevent tearing open screw 1.
The embodiment of the utility model provides an in, set up at least three recess 121 around the axis interval distribution of nut 12 through nut 12 at anti-dismounting screw 1 to the setting is with the isolation 122 that at least three recess 121 kept apart each other, and isolation 122 sets up between each recess 121, keeps apart each other through isolation 122 between each recess 121. Due to the existence of the isolation part 122, the universal screwdriver bits in a line shape or a cross shape and the like can not be buckled into the groove 121 of the nut 12, so that the anti-dismantling screw 1 can be effectively prevented from being opened by the universal screwdriver bits in a line shape or a cross shape and the like, and the anti-dismantling screw 1 can be opened only by screwing the special screwdriver bits provided with the bosses 21 matched with the grooves 121 of the anti-dismantling screw 1, so that the anti-dismantling effect is achieved, and the user can be prevented from dismantling the anti-dismantling screw 1 by himself.
The embodiment of the utility model provides an in, through set up at least three recess 121 on preventing tearing open screw 1's nut 12, improved greatly and criticized first 2 boss 21 and the lock rate of preventing tearing open screw 1's recess 121, promoted criticize first 2 and prevent tearing open screw 1's counterpoint ability.
The embodiment of the utility model provides an in, inner wall through recess 121 preventing tearing screw 1 open is equipped with first guide part, and set up the second guide part that sets up with the cooperation of first guide part on criticizing first 2 boss 21, cooperation through second guide part and first guide part, even criticize first 2 boss 21 and the slight off normal of recess 121 that corresponds, because second guide part and first guide part mutually support and play the guide effect, make criticizing first 2 boss 21 also can block smoothly into prevent tearing in the recess 121 that screw 1 corresponds, conveniently criticize first 2 and prevent tearing screw 1's counterpoint.
The embodiment of the utility model provides an in, screw rod 11's surface is equipped with double thread, has promoted screw rod 11's trompil ability.
The embodiment of the utility model provides an in, the quantity of recess 121 is 3 ~ 5, criticizes the quantity of overhead 2 boss 21 and prevents tearing open the quantity of the recess 121 of screw 1 unanimously, and criticizes overhead 2 and goes up the position that sets up of each boss 21 and recess 121 phase-match. Be 3 ~ 5 through the quantity with recess 121, both promoted wholesale head 2 and prevented tearing open the counterpoint ability of screw 1, and be convenient for prevent tearing open screw 1 and wholesale head 2's processing.
Referring to fig. 5 again, as an embodiment of the present invention, the number of the grooves 121 is three, the three grooves 121 are uniformly spaced around the central axis of the nut 12, and the included angle θ 1 formed by the central lines of two adjacent grooves 121 is 120 °.
In this embodiment, the number of the bosses 21 on the batch head 2 is three, and the setting positions of the three bosses 21 are matched with the setting positions of the three grooves 121 of the tamper screw 1.
In this embodiment, the number of the grooves 121 is three, and the included angle θ 1 formed by the center lines of two adjacent grooves 121 is 120 °. When the batch head 2 is aligned with the anti-dismounting screw 1, the batch head 2 can be aligned with the three grooves 121 of the anti-dismounting screw 1 once rotating 120 degrees, so that the probability that the boss 21 of the batch head 2 is buckled into the groove 121 of the anti-dismounting screw 1 is greatly improved, and the alignment capability of the batch head 2 and the anti-dismounting screw 1 is effectively improved; moreover, after the alignment capability of the screwdriver head 2 and the anti-dismantling screw 1 is improved, the problem that the screwdriver head 2 idles due to the fact that the screwdriver head 2 cannot be buckled into the groove 121 of the anti-dismantling screw 1 can be effectively solved, and the problem that the anti-dismantling screw 1 cannot be in place due to idling of the screwdriver head 2 and the product is damaged due to the fact that the anti-dismantling screw 1 is inclined is solved.
In this embodiment, the number of the grooves 121 is three, and the three bosses 21 on the screwdriver head 2 can stabilize the nut 12 of the anti-removal screw 1 by using the principle that three points can fix one plane, so that the anti-removal screw 1 is not easy to damage a product due to deflection when being locked.
In this embodiment, the groove 121 is a square groove, which facilitates the processing of the groove 121. In addition, the groove 121 may be provided in other shapes.
As an embodiment of the utility model, the border position of recess 121 is equipped with the opening that communicates with the nut 12 outside to do benefit to the external diameter design size that increases batch head 2 and go up boss 21, thereby increase batch head 2's intensity.
Referring to fig. 7 again, as an embodiment of the present invention, the first guiding portion is a first inclined plane 123 having a predetermined included angle with the central axis of the nut 12, and the second guiding portion is a second inclined plane 211 disposed in cooperation with the first inclined plane 123. Criticize first boss 21 on 2 and prevent tearing open recess 121 of screw 1 when counterpointing, through the cooperation of first inclined plane 123 with second inclined plane 211 to play the guide effect when getting into recess 121 to boss 21, even criticize first boss 21 on 2 and the slight off normal of recess 121 that corresponds, criticize first boss 21 of 2 also can block smoothly and prevent tearing open in the recess 121 that screw 1 corresponds, make things convenient for criticizing first 2 and prevent tearing open the counterpoint of screw 1.
As an optimal embodiment of the utility model, the contained angle α of first inclined plane 123 and the axis of nut 12 is 5 ~ 10, and second inclined plane 211 is 20 ~ 30 with the contained angle β of the axis of criticizing first body 20 through being 5 ~ 10 with the contained angle α of the axis of first inclined plane 123 and nut 12, and second inclined plane 211 is 20 ~ 30 with the contained angle β of the axis of criticizing first body 20, has guaranteed the good guide effect of first inclined plane 123 and second inclined plane 211.
As another embodiment of the present invention, the first guiding portion is a first arc surface, and the second guiding portion is a second arc surface disposed in cooperation with the first arc surface. When criticizing first 2 and preventing tearing open recess 121 of screw 1 counterpoint, through the cooperation of the second cambered surface on the boss 21 and the first cambered surface of recess 121 for criticize first 2 boss 21 can block smoothly in preventing tearing open recess 121 that screw 1 corresponds, conveniently criticize first 2 and prevent tearing open counterpoint of screw 1.
Referring to fig. 6 again, as an embodiment of the present invention, the groove 121 includes a bottom wall 1211, two first inner walls 1212 disposed on opposite sides of the bottom wall 1211, and a second inner wall 1213 connecting the two first inner walls 1212, the first guiding portion is disposed on the second inner wall 1213, and an included angle between the first inner wall 1212 and the bottom wall 1211 is 85-95 °. Through setting up the contained angle of first inner wall 1212 with the diapire 1211 for recess 121 to 85 ~ 95, avoid criticizing first 2 and appear skidding when driving anti-disassembly screw 1 clockwise or anticlockwise rotation for the boss 21 of criticizing first 2 is difficult to follow recess 121 upper portion roll-off of anti-disassembly screw 1. In addition, the first guiding portion may be disposed on the first inner wall 1212.
As an embodiment of the present invention, the bottom of the boss 21 is provided with a first fillet 212 contacting the top of the nut 12 to reduce stress concentration, thereby enhancing the strength of the bit 2. The top of the boss 21 is provided with a second fillet 213 which can contact with the first inner wall 1212 of the groove 121, so as to avoid the sharp corner from scratching the anti-dismantling screw 1 and prevent the anti-dismantling screw 1 from rusting due to damage of the electroplated layer of the anti-dismantling screw 1.
The screw anti-dismounting device provided by the embodiment of the utility model is provided with at least three grooves distributed around the central axis of the screw cap on the screw cap of the anti-dismounting screw, and is provided with an isolation part for isolating the at least three grooves from each other, because of the existence of the isolation part, universal screwdriver bits such as a straight line shape or a cross shape and the like can not be screwed into the grooves of the screw cap, only specific screwdriver bits matched with each groove of the anti-dismounting screw can be screwed into the grooves of the anti-dismounting screw, thereby preventing a user from adopting the universal screwdriver bits to dismount the anti-dismounting screw; simultaneously, through set up at least three recess on the nut of preventing tearing open the screw, improved the boss of criticizing the head greatly and prevented the lock rate of the recess of tearing open the screw, promoted the counterpoint ability of criticizing the head and preventing tearing open the screw. The inner wall of the groove of the anti-dismantling screw is provided with the first guide part, the boss of the screwdriver head is provided with the second guide part matched with the first guide part, and the boss of the screwdriver head can be smoothly clamped into the groove of the anti-dismantling screw under the guide effect of the mutual matching of the second guide part and the first guide part, so that the alignment of the screwdriver head and the anti-dismantling screw is facilitated.
Example two
Referring to fig. 8 to 10, the difference between the present embodiment and the first embodiment is that the groove 121 is an arc groove, and the boss 21 is an arc boss.
In this embodiment, through being the circular arc groove with recess 121, be favorable to increaseing the width of criticizing first 2 last boss 21 to can improve boss 21's intensity, and then improve the structural strength of criticizing first 2.
EXAMPLE III
Referring to fig. 11 to 12, the difference between the first embodiment and the second embodiment is that the number of the grooves 121 is four, four grooves 121 are uniformly distributed around the central axis of the nut 12 at intervals, and the included angle formed by the central lines of two adjacent grooves 121 is 90 °; the number of the bosses 21 on the batch head 2 is four, and the arrangement positions of the four bosses 21 are matched with the four grooves 121.
In this embodiment, when the screwdriver bit 2 is aligned with the anti-removal screw 1, the screwdriver bit 2 can be aligned with the four grooves 121 of the anti-removal screw 1 once when rotating 90 degrees, so that the probability that the boss 21 of the screwdriver bit 2 is buckled into the groove 121 of the anti-removal screw 1 is further improved, and the alignment capability of the screwdriver bit 2 and the anti-removal screw 1 is further improved.
In this embodiment, the groove 121 may be a square groove or an arc groove, and the shape of the boss 21 is matched with the shape of the groove 121. In addition, the groove 121 may be provided in other shapes.
In this embodiment, the groove 121 includes a bottom wall 1211, two first inner walls 1212 disposed on opposite sides of the bottom wall 1211, and a second inner wall 1213 connecting the two first inner walls 1212, the first guiding portion is disposed on the second inner wall 1213, and an included angle between the first inner wall 1212 and the bottom wall 1211 is 90 °. Through setting the included angle between the first inner wall 1212 of the groove 121 and the bottom wall 1211 to 90 °, the slipping phenomenon when the screwdriver bit 2 drives the anti-dismounting screw 1 to rotate clockwise or counterclockwise is avoided, so that the boss 21 of the screwdriver bit 2 is not easy to slip out from the upper part of the groove 121 of the anti-dismounting screw 1.
The embodiment of the present invention is only a preferred embodiment, and is not intended to limit the present invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A screw anti-dismounting device is characterized by comprising an anti-dismounting screw and a batch head matched with the anti-dismounting screw;
the anti-dismantling screw comprises a screw rod with threads and a nut integrally formed with one end of the screw rod, the nut is provided with at least three grooves distributed at intervals around the central axis of the nut and isolating parts for isolating the at least three grooves from each other, and the inner wall of each groove is provided with a first guiding part;
criticize the head including criticizing the head body, locate criticize on the head body and with the boss that the recess cooperation set up, be equipped with on the boss with the second guide part that the cooperation of first guide part set up, the boss can be correspondingly put into be used for revolving in the recess and twist prevent tearing open the screw.
2. The screw tamper device according to claim 1, wherein the number of the grooves is 3 to 5.
3. The screw detachment prevention device according to claim 1 or 2, wherein the number of the grooves is three, the three grooves are uniformly spaced around the central axis of the nut, and an included angle formed by center lines of two adjacent grooves is 120 °.
4. The screw detachment prevention device according to claim 1, wherein the first guide portion is a first inclined surface having a predetermined included angle with a central axis of the nut, and the second guide portion is a second inclined surface disposed to be engaged with the first inclined surface; or the first guide part is a first cambered surface, and the second guide part is a second cambered surface matched with the first cambered surface.
5. The screw detachment prevention device according to claim 4, wherein an included angle between the first inclined surface and the central axis of the nut is 5-10 °, and an included angle between the second inclined surface and the central axis of the bit body is 20-30 °.
6. The screw detachment prevention device according to claim 1, wherein the groove includes a bottom wall, two first inner walls disposed on opposite sides of the bottom wall, and a second inner wall connecting the two first inner walls, the first guide portion is disposed on the second inner wall, and an included angle between the first inner wall and the bottom wall is 85-95 °.
7. The utility model provides a prevent tearing open screw, its characterized in that, including establish the screwed screw rod and with screw rod one end integrated into one piece's nut, the nut is equipped with the winding at least three recess that the axis of nut distributes and will the isolation portion that at least three recess kept apart each other, every the inner wall of recess is equipped with the first guide part that sets up with the cooperation of the second guide part of criticizing the head.
8. The tamper-evident screw of claim 7 wherein the first guide portion is a first inclined surface having a predetermined included angle with a central axis of the nut, and the second guide portion is a second inclined surface disposed in cooperation with the first inclined surface; or the first guide part is a first cambered surface, and the second guide part is a second cambered surface matched with the first cambered surface.
9. The utility model provides a criticize head, its characterized in that, including criticizing first body, with criticize first body integrated into one piece and with the boss that sets up with the recess cooperation of the nut of preventing tearing open the screw, the boss be equipped with the second guide part that the cooperation of the first guide part of nut set up, the boss can correspond to be put into be used for revolving in the recess and twist prevent tearing open the screw.
10. The screwdriver bit as claimed in claim 9, wherein the first guiding portion is a first inclined surface having a predetermined included angle with the central axis of the nut, and the second guiding portion is a second inclined surface disposed in cooperation with the first inclined surface; or the first guide part is a first cambered surface, and the second guide part is a second cambered surface matched with the first cambered surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921565998.4U CN210830057U (en) | 2019-09-19 | 2019-09-19 | Screw anti-dismounting device, anti-dismounting screw and screwdriver bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921565998.4U CN210830057U (en) | 2019-09-19 | 2019-09-19 | Screw anti-dismounting device, anti-dismounting screw and screwdriver bit |
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| CN210830057U true CN210830057U (en) | 2020-06-23 |
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| CN201921565998.4U Active CN210830057U (en) | 2019-09-19 | 2019-09-19 | Screw anti-dismounting device, anti-dismounting screw and screwdriver bit |
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| CN (1) | CN210830057U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608222A (en) * | 2019-09-19 | 2019-12-24 | 公牛集团股份有限公司 | Screw anti-dismounting device, anti-dismounting screw and screwdriver bit |
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2019
- 2019-09-19 CN CN201921565998.4U patent/CN210830057U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608222A (en) * | 2019-09-19 | 2019-12-24 | 公牛集团股份有限公司 | Screw anti-dismounting device, anti-dismounting screw and screwdriver bit |
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