CN215848005U

CN215848005U - Anti-disassembling screw, locking tool and screw locking tool set

Info

Publication number: CN215848005U
Application number: CN202122325841.8U
Authority: CN
Inventors: 林君翰; 曾勇智
Original assignee: Shenzhen Fushida Communication Co ltd; First Dome Corp
Current assignee: Shenzhen Fushida Communication Co ltd; First Dome Corp
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-02-18
Anticipated expiration: 2031-09-24

Abstract

The utility model provides an anti-disassembly screw, locking tool and spiral shell locking instrument group, spiral shell locking instrument group contains anti-disassembly screw and locking tool. The locking tool comprises a handle and a positioning rotating pin. The handle includes a locking ratchet structure. The positioning rotary pin comprises a convex column. The anti-dismantling screw comprises a screw body and a buckle structure. The screw body is provided with an anti-dismantling ratchet structure which can be meshed with the locking ratchet structure and a screw head inner hole. The buckle structure is arranged in the screw head inner hole, and defines a connection groove and a limit groove communicated with the connection groove and extending along the disassembly direction. The convex column penetrates through the limiting groove, so that the anti-disassembly ratchet structure cannot be staggered relative to the locking ratchet structure and can be driven by the grab handle to rotate towards the disassembly direction. Therefore, the anti-dismantling screw can be dismantled only by the locking tool, so that the aim of good anti-theft effect can be fulfilled.

Description

Anti-disassembling screw, locking tool and screw locking tool set

Technical Field

The present invention relates to an anti-tamper screw and a locking tool thereof, and more particularly to an anti-tamper screw for preventing theft, a locking tool for disassembling and assembling the anti-tamper screw, and a screw locking tool set including the anti-tamper screw and the locking tool thereof.

Background

Existing screws are typically removable using conventional screwdrivers, so that the equipment can be easily removed and risk theft when installed in an external area via existing screws. Therefore, how to avoid the easy disassembly of the screw becomes a subject of great research by manufacturers.

Disclosure of Invention

The utility model aims to provide a disassembly-preventing screw with good anti-theft effect.

The anti-dismantling screw is suitable for being matched with a locking tool to be used so as to be dismantled and assembled on an external structure. The locking tool comprises a handle and a positioning rotating pin. The grab handle comprises a holding part and a locking ratchet structure arranged at the front end of the holding part. The positioning rotary pin comprises a rod body which axially extends and can be arranged on the grab handle in a penetrating mode in a pivoting mode and at least one convex column which radially extends from the front end of the rod body. The convex column is exposed out of the locking ratchet structure.

The anti-dismantling screw comprises a screw body and a buckle structure. The screw body comprises a screw head and a screw rod which extends forwards from the front side of the screw head and can be arranged on the external structure in a penetrating mode. The screw head is provided with an anti-dismantling ratchet structure positioned at the rear side and a screw head inner hole with an opening surrounded by the anti-dismantling ratchet structure. The tamper evident ratchet formation is adapted to engage with the locking ratchet formation.

The buckle structure is arranged in the inner hole of the screw head and comprises a base wall and a surrounding wall extending backwards from the outer edge of the base wall. The base wall and the surrounding wall define a joining groove with a backward opening. The surrounding wall forms at least one limiting groove which is communicated with the connecting groove and extends along the disassembling direction. The limiting groove is spaced from the rear side face of the surrounding wall. The connecting groove is suitable for the convex column to penetrate into the limiting groove in a movable mode so as to limit the axial displacement of the grab handle.

When the anti-disassembly ratchet structure is meshed with the locking ratchet structure, the screw body can be driven by the grab handle to rotate towards a locking direction opposite to the disassembly direction by taking the rod body as an axis. When the anti-disassembly ratchet structure is meshed with the locking ratchet structure and the limiting groove is used for the protruding column to penetrate, the anti-disassembly ratchet structure cannot be staggered relative to the locking ratchet structure, and the screw body can be driven by the grab handle to rotate towards the disassembly direction by taking the rod body as an axis.

The anti-dismantling screw of the utility model is characterized in that the locking ratchet structure is provided with a plurality of force application surfaces which extend along the length direction of the holding part and are arranged at intervals in a ring shape, and a plurality of abutting surfaces which are respectively positioned between two adjacent force application surfaces, the abutting surfaces extend obliquely relative to the force application surfaces, the anti-dismantling ratchet structure is provided with a plurality of force bearing surfaces which extend backwards and are arranged at intervals in a ring shape, and a plurality of sliding surfaces which are respectively positioned between two adjacent force bearing surfaces, the gradient of the sliding surfaces corresponds to the abutting surfaces, when the force bearing surfaces of the screw body are respectively and continuously abutted by the force application surfaces of the holding handle, the screw body can be driven by the holding handle to rotate towards the locking direction, when the sliding surfaces of the screw body are respectively and continuously abutted by the abutting surfaces of the holding handle, and the convex column penetrates into the limiting groove, so that the screw body can not axially displace along the sliding surfaces, the screw body can be driven by the grab handle to rotate towards the disassembly direction.

The anti-disassembly screw comprises two convex columns radially extending from two sides of the front end of the rod body, two limiting grooves which are communicated with the connection groove and extend along the disassembly direction are respectively formed on two sides of the surrounding wall, the connection groove is provided with a main groove part which is defined by the base wall and the surrounding wall and is suitable for the rod body to penetrate, and two positioning groove parts which are formed on the rear side of the surrounding wall and are communicated with the main groove part, and the positioning groove parts are respectively communicated with the limiting grooves and are used for the convex columns to penetrate into the limiting grooves in a displaceable manner so as to limit the grab handle from being incapable of axial displacement.

Another object of the present invention is to provide a locking tool which can be used with the anti-detachment screw and is convenient to use.

The locking tool of the present invention is suitable for use in attaching and detaching tamper screws to external structures. The anti-dismantling screw comprises a screw body and a buckle structure. The screw body comprises a screw head and a screw rod which extends forwards from the front side of the screw head and can be arranged on the external structure in a penetrating mode. The screw head is provided with an anti-dismantling ratchet structure positioned at the rear side and a screw head inner hole with an opening surrounded by the anti-dismantling ratchet structure. The buckle structure is arranged in the inner hole of the screw head and comprises a base wall and a surrounding wall extending backwards from the outer edge of the base wall. The base wall and the surrounding wall define a joining groove with a backward opening. The surrounding wall forms at least one limiting groove which is communicated with the connecting groove and extends along the disassembling direction. The limiting groove is spaced from the rear side face of the surrounding wall.

The locking tool comprises a handle and a positioning rotating pin. The handle comprises a holding part, a pivoting groove which is penetrated through the holding part in the front and back direction, and a locking ratchet structure which is arranged at the front end of the holding part and surrounds an opening of the pivoting groove. The locking ratchet structure is adapted to engage with the tamper-evident ratchet structure.

The positioning rotary pin comprises a rod body which extends axially and can be penetrated into the pivoting groove in a pivoting mode, and at least one convex column which extends radially from the front end of the rod body. The convex column is exposed outside the locking ratchet structure and can penetrate into the connecting groove to the limiting groove in a movable mode so as to limit the handle to be incapable of moving axially.

When the locking ratchet structure is meshed with the anti-disassembly ratchet structure, the grab handle can drive the screw body to rotate towards a locking direction opposite to the disassembly direction by taking the rod body as an axis. When the locking ratchet structure is meshed with the anti-dismantling ratchet structure and the convex column penetrates into the limiting groove, the locking ratchet structure cannot be staggered relative to the anti-dismantling ratchet structure, and the grab handle can drive the screw body to rotate towards the dismantling direction by taking the rod body as an axis.

In the locking tool of the present invention, the fastening structure is pivotally mounted in the screw head inner hole, the engaging groove has at least one positioning groove portion extending forward from the rear side surface of the surrounding wall, and the grip further includes at least one engaging block protruding forward from the front end of the holding portion, and the engaging block is adapted to penetrate into the positioning groove portion to limit the fastening structure from being unable to pivot.

The locking tool further comprises a pivoting handle which can be pivotally arranged at the rear end of the holding part, the pivoting handle is connected to one end, away from the convex column, of the rod body, and when the pivoting handle rotates by taking the rod body as an axis, the convex column can be driven to move in the limiting groove.

According to the locking tool, the pivoting handle is provided with the axially extending connecting convex part and at least one radially extending positioning convex part, one side, away from the locking ratchet structure, of the holding part forms an axially extending grab handle connecting groove and at least one grab handle limiting groove which is communicated with the grab handle connecting groove and extends along the disassembling direction, the grab handle connecting groove is used for enabling the positioning convex part to penetrate into the grab handle limiting groove, and when the pivoting handle rotates towards the disassembling direction, the pivoting handle can be abutted against the groove wall of the grab handle limiting groove to drive the grab handle to rotate.

Another object of the present invention is to provide a screw locking tool set with good anti-theft effect and convenient use.

The screw locking tool set comprises the anti-dismantling screw and the locking tool. The locking tool is matched with the anti-dismantling screw for use.

The utility model has the beneficial effects that: the convex columns are respectively and rotatably penetrated into the corresponding connecting grooves along the disassembling direction through the limiting grooves, so that the disassembly-preventing ratchet structure cannot be staggered relative to the locking ratchet structure and can be driven by the pivoting handle to rotate towards the disassembling direction. Thus, even if the anti-disassembly screw can be engaged with the anti-disassembly ratchet structure under the condition of using a common tool (without a positioning rotating pin), the anti-disassembly screw cannot be disassembled, namely, the anti-disassembly screw can be disassembled only by the locking tool with the positioning rotating pin, so that the aim of achieving good anti-theft effect can be achieved. In addition, the pivoting handle is matched with the grab handle to drive the screw body to rotate towards the locking direction or the disassembling direction by taking the rod body as an axis, so that a user can assemble or disassemble the disassembling-preventing screw by holding the pivoting handle with one hand, and the effect of convenient use is achieved. Furthermore, when the user detaches the detachment prevention screw, the pivot handle can be rotated by only one hand to drive the positioning rotary pin to rotate, so that the convex column respectively penetrates into the limiting groove and synchronously rotates with the grab handle, the locking tool is simpler and easier to use, and the effect of convenient use is achieved.

Drawings

Other features and effects of the present invention will be apparent from the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view illustrating the use of an embodiment of the screw locking tool set of the present invention with an external structure;

FIG. 2 is an exploded perspective view illustrating the external structure and the tamper-evident screw and locking tool of the embodiment;

FIG. 3 is a perspective view from another perspective illustrating the connection relationship of the external structure, the tamper screw and the locking tool;

FIG. 4 is an exploded perspective view from the same perspective as FIG. 3 illustrating the outer structure, the tamper screw and the locking tool;

FIG. 5 is a left side view illustrating the locking tool driving the tamper screw to rotate in a locking direction with the head of the tamper screw abutting against the external structure;

FIG. 6 is a left side view of the locking tool driving the anti-removal screw in a removal direction with the screw head spaced from the outer structure.

Detailed Description

Referring to fig. 1 to 4, a screw locking tool set according to an embodiment of the present invention is shown. The screw locking tool set comprises a disassembly-preventing screw 1 and a locking tool 4 matched with the disassembly-preventing screw 1 for use. The locking tool 4 is suitable for screwing the anti-dismantling screw 1 on an external structure 9, and can also be used for unscrewing the anti-dismantling screw 1 from the external structure 9. The external structure 9 may be a casing, a wall surface, or other structures that need to be assembled or fixed, but is not limited to a specific form. In the present embodiment, although one anti-tamper screw 1 and one locking tool 4 are used as an example, in various situations such as use, manufacture, sale, etc., the anti-tamper screw 1 and the locking tool 4 of the screw locking tool set are not limited to a specific number of combinations, as required.

Referring to fig. 3 to 5, directional terms used herein for the description are first defined. In fig. 5, the right side of the locking tool 4 is defined as "front side", the left side of the locking tool 4 is defined as "rear side", and the axial direction X and the radial direction r of the locking tool 4 are defined. The locking tool 4 comprises a handle 5, a positioning rotating pin 6 which is pivotally arranged on the handle 5 in a penetrating way and one end of which is exposed out of the front end of the handle 5, and a pivoting handle 7 which is connected to the rear end of the positioning rotating pin 6 and is pivotally arranged on the rear end of the handle 5. The handle 5 includes a holding portion 51, a locking ratchet structure 52 disposed at the front end of the holding portion 51 and surrounding the positioning screw pin 6, a pivoting slot 53 passing through the holding portion 51 in a front-rear direction and having an opening surrounded by the locking ratchet structure 52, and two locking blocks 54 protruding forward from the front end of the holding portion 51 and exposed outside the locking ratchet structure 52. The rear side surface of the holding part 51 is formed with a grab handle connecting groove 511 extending axially (extending along the axial direction X), and two grab handle limiting grooves 512 respectively communicating with two sides of the grab handle connecting groove 511 and extending along a disassembly direction phi. In this embodiment, the number of the latch 54 and the number of the handle limiting groove 512 may be one or more than three, and is not limited to a specific number.

The locking ratchet structure 52 is serrated, and has a plurality of force applying surfaces 521 extending along the length direction of the holding portion 51 and arranged annularly at intervals, and a plurality of abutting surfaces 522 respectively located between two adjacent force applying surfaces 521. The abutting surface 522 extends obliquely with respect to the force application surface 521. In this embodiment, the force applying surface 521 extends axially along the positioning screw 6 (extends axially along the axial direction X), so that the force applying surface 521 can apply force to rotate with maximum torque when the locking ratchet structure 52 pivots around the positioning screw 6.

The pivot handle 7 has an engaging protrusion 71 extending along the axial direction X and pivotally penetrating into the handle engaging groove 511, two positioning protrusions 72 extending along the radial direction r from both sides of the engaging protrusion 71, respectively, and an engaging through hole 73 passing through the engaging protrusion 71 along the axial direction X and aligned with the pivot groove 53. The positioning protrusions 72 respectively penetrate into the handle limiting grooves 512 from two sides of the handle engaging groove 511 in a movable manner. In this embodiment, the engaging through hole 73 is used for the rear end of the positioning rotation pin 6 to penetrate, so that the pivoting handle 7 is fixed with the positioning rotation pin 6 and can drive the positioning rotation pin 6 to rotate. When the pivot handle 7 rotates in the detaching direction phi with the positioning rotating pin 6 as an axis, the positioning protrusions 72 can penetrate into the handle limiting grooves 512 respectively to limit the pivot handle 7 from axial displacement X, and abut against the groove walls of the handle limiting grooves 512 to drive the handle 5 to rotate, so as to increase the moment of the locking tool 4 applying force to the detaching-proof screw 1, and thus the locking tool 4 is more labor-saving in use. The number of the positioning protrusions 72 may be one or more than three corresponding to the number of the handle stopper grooves 512, and is not limited to a specific number.

The positioning rotation pin 6 comprises a rod body 61 extending along the axial direction X and pivotally penetrating into the pivot groove 53, and two convex columns 62 extending along the radial direction r from two sides of the front end of the rod body 61 respectively. The protruding posts 62 are exposed outside the locking ratchet structure 52. The rod 61 has a supporting portion 611 connected with the protruding pillar 62 and pivotally penetrating into the pivoting slot 53, and an engaging end 612 extending backward from the supporting portion 611 and connected with the pivoting handle 7. In this embodiment, the engaging end 612 is detachably inserted into the engaging through hole 73 from the pivoting slot 53, so as to facilitate assembling the positioning rotation pin 6, the handle 5 and the pivoting handle 7. However, the assembly method of the locking tool 4 is not limited to the foregoing, and the engaging end 612 may be fixed to the pivot handle 7, and the handle 5 may be disposed on two sides of the positioning screw 6 in two separable parts, so as to complete the assembly of the locking tool 4. The radial r cross-sectional shapes of the supporting portion 611 and the engaging through hole 73 are different, so that the supporting portion 611 is stopped by the engaging protrusion 71 and cannot move backward after the engaging end 612 penetrates the engaging through hole 73. In addition, the number of the convex columns 62 can be one, so that the manufacturing is convenient; or more than three, the design of the positioning rotary pin 6 is more complicated and is not easy to copy.

Referring to fig. 1, 2, 4 and 5, the tamper-proof screw 1 includes a screw body 2 and a locking structure 3. The screw body 2 includes a head 21 and a rod 22 extending forward from the front side of the head 21 and capable of passing through the outer structure 9. The front end of the screw 22 is threaded for locking to the outer structure 9. The screw head 21 has an annular outer wall 211 and a detachment prevention ratchet structure 212 connected to the rear side of the outer wall 211. The outer wall 211 defines a head bore 213 that is open and surrounded by the tamper ratchet feature 212. The anti-tamper ratchet structure 212 is adapted to engage with the locking ratchet structure 52, and the shape of the anti-tamper ratchet structure 212 is zigzag corresponding to the shape of the locking ratchet structure 52, and has a plurality of force bearing surfaces 215 extending backwards and arranged in a circular and spaced manner, and a plurality of sliding surfaces 216 respectively located between two adjacent force bearing surfaces 215. The inclination of the sliding surface 216 corresponds to the abutting surface 522. More specifically, each of the slip surfaces 216 extends from a front edge of one of the two adjacent force-receiving surfaces 215 to a rear edge of the other of the two adjacent force-receiving surfaces 215 while being inclined in the removal direction Φ. In this embodiment, the force-bearing surface 215 faces a locking direction θ opposite to the detaching direction Φ, and the extending direction of the force-bearing surface 215 corresponds to the force-applying surface 521 and extends axially (extends along the axial direction X) along the rod 61, so that the force-bearing surface 215 can be used to block the force-applying surface 521, and when the locking tool 4 drives the detaching-prevention screw 1 to rotate in the locking direction θ, the locking ratchet structure 52 can be prevented from sliding relative to the detaching-prevention ratchet structure 212 in the locking direction θ, so as to achieve the purpose of driving the detaching-prevention screw 1 to rotate in the locking direction θ by the locking tool 4.

The fastening structure 3 is mounted in the screw head inner hole 213 and includes a base wall 31 and a surrounding wall 32 extending backward from the outer edge of the base wall 31. The base wall 31 and the surrounding wall 32 define a rearwardly opening engagement slot 33. The engaging groove 33 has a main groove portion 331 defined by the base wall 31 and the surrounding wall 32 and through which the rod 61 penetrates, and two positioning groove portions 332 respectively formed on both sides of the rear side of the surrounding wall 32 and communicating with the main groove portion 331. The surrounding wall 32 forms two limit grooves 34 respectively communicating with the positioning groove portions 332 and extending along the detaching direction phi, and each positioning groove portion 332 and the corresponding limit groove 34 form an L-shaped groove on the surrounding wall 32 for each protruding column 62 to penetrate and slide. The retaining groove 34 is spaced from the rear side of the perimeter wall 32. The positioning groove portions 332 respectively allow the protruding post 62 to movably penetrate into the limiting groove 34, and when the protruding post 62 is located in the limiting groove 34, the protruding post 62 can limit the displacement of the handle 5, which cannot be caused by the anti-removal screw 1, to the rear side along the axial direction X, and cannot be dislocated with respect to the screw body 2. In this embodiment, the fastening structure 3 is rotatably mounted in the screw head inner hole 213, but may be fixed in the screw head inner hole 213 and not be rotatable if necessary. The positioning groove portions 332 are respectively penetrated by the latch 54 to limit the rotation of the snap structure 3 relative to the handle 5. In addition, the number of the positioning groove portions 332 and the number of the limiting grooves 34 corresponding to the number of the protruding columns 62 may also be one or more than three, so that at least one protruding column 62 can be clamped in the limiting groove 34, and the design of the buckle structure 3 can be customized according to the anti-theft requirement.

Referring to fig. 5 and 6, when the anti-tamper screw 1 needs to be screwed to the external structure 9, the screw 22 of the anti-tamper screw 1 may be aligned with the locking hole of the external structure 9, and then the locking tool 4 is inserted into the screw head inner hole 213 along the axial direction X, so that the anti-tamper ratchet structure 212 is engaged with the locking ratchet structure 52, and the protruding columns 62 of the positioning screw 6 are respectively inserted into the front ends of the positioning slot portions 332, and the blocks 54 of the handle 5 are respectively inserted into the rear ends of the positioning slot portions 332. Next, as shown in fig. 5, the pivoting handle 7 is rotated towards the locking direction θ by taking the rod body 61 as an axis, and drives the handle 5 to rotate in the same direction, at this time, the protruding post 62 and the latch 54 both abut against the groove wall of the positioning groove 332, and the force applying surface 521 continuously abuts against the force bearing surface 215 respectively to drive the screw body 2 to rotate towards the locking direction θ, so that the screw head 21 abuts against the external structure 9 to lock the anti-dismounting screw 1. On the contrary, when the anti-tamper screw 1 needs to be detached from the external structure 9, as shown in fig. 6, the locking tool 4 is first set at the anti-tamper screw 1, meanwhile, the blocks 54 of the handle 5 are respectively inserted into the positioning groove 332, and then the pivoting handle 7 is rotated toward the detaching direction phi by using the rod 61 as an axis to drive the protruding columns 62 to respectively penetrate into the limiting grooves 34, and at this time, the positioning protrusions 72 are also respectively inserted into the handle limiting grooves 512. Then, the pivoting handle 7 is rotated continuously in the detaching direction phi, and after the positioning protrusion 72 moves to the innermost end of the handle-limiting groove 512 and abuts against the groove wall, the grip 5 can be turned in the dismounting direction phi in conjunction with the pivoting handle 7, while, since the protruding column 62 is located in the limiting groove 34, the locking tool 4 cannot move in the axial direction X toward the rear side relative to the tamper-proof screw 1, the abutting surfaces 522 are continuously pressed tightly against the sliding surfaces 216, so that the rotation of the locking tool 4 in the detaching direction phi causes the abutting surfaces 522 to continuously apply force to the sliding surfaces 216, the screw body 2 can be driven to rotate towards the disassembly direction phi, so that the screw head 21 moves towards the direction away from the external structure 9, and the anti-disassembly screw 1 can be disassembled from the external structure 9. In the detaching process, the pivoting handle 7 is rotated, and then the pivoting handle 7 drives the handle 5 to rotate together, so that the user can detach the tool in a simple and labor-saving way.

In summary, the protruding columns 62 are respectively rotatably inserted into the corresponding engaging slots 33 along the detaching direction phi through the limiting slots 34, so that the detachment prevention ratchet structure 212 cannot be dislocated relative to the locking ratchet structure 52, and can be driven by the pivot handle 7 to rotate in the detaching direction phi. In this way, even if the anti-tamper screw 1 can be engaged with the anti-tamper ratchet structure 212 by using a common tool (without a positioning screw pin), the anti-tamper screw 1 cannot be removed, that is, the anti-tamper screw 1 needs to be removed by the locking tool 4 with the positioning screw pin 6, so that the anti-theft effect can be achieved. In addition, the pivoting handle 7 is matched with the grab handle 5, and the screw body 2 can be driven to rotate towards the locking direction theta or the disassembling direction phi by taking the rod body 61 as an axis, so that a user can assemble or disassemble the anti-disassembling screw 1 by holding the pivoting handle 7 with one hand, and the effect of convenient use is achieved. Furthermore, when the user detaches the detachment prevention screw 1, the user can rotate the pivot handle 7 with only one hand to drive the positioning rotation pin 6 to rotate, so that the convex posts 62 respectively penetrate into the limiting grooves 34 and synchronously rotate with the grab handle 5, and the locking tool 4 can be more easily used, thereby achieving the effect of convenient use and really achieving the purpose of the utility model.

The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and the utility model is still within the scope of the present invention by simple equivalent changes and modifications made according to the claims and the contents of the specification.

Claims

1. The utility model provides a prevent tearing open screw, is applicable to cooperation locking instrument and uses to dismouting is in exterior structure, locking instrument contains grab handle and location and revolves the round pin, the grab handle includes the portion of gripping and sets up in the closure ratchet structure of the portion of gripping front end, but the location is revolved the round pin and is included axial extension and pivot ground and wear to locate the body of rod of grab handle, and at least one from the front end radial extension's of the body of rod projection, the projection is exposed to outside the closure ratchet structure, its characterized in that, prevent tearing open the screw and contain:

the screw comprises a screw body and a screw rod, wherein the screw rod extends forwards from the front side of the screw head and can be arranged on the external structure in a penetrating mode, the screw head is provided with an anti-dismantling ratchet structure located on the rear side and a screw head inner hole with an opening surrounded by the anti-dismantling ratchet structure, and the anti-dismantling ratchet structure is suitable for being meshed with the locking ratchet structure; and

the buckle structure is arranged in the inner hole of the screw head and comprises a base wall and a surrounding wall extending backwards from the outer edge of the base wall, the base wall and the surrounding wall define a joining groove with a backward opening, the surrounding wall forms at least one limiting groove which is communicated with the joining groove and extends along the disassembly direction, the limiting groove is spaced from the rear side surface of the surrounding wall, the joining groove is suitable for the convex column to penetrate into the limiting groove in a displaceable manner so as to limit the axial displacement of the grab handle,

when the anti-disassembly ratchet structure is meshed with the locking ratchet structure, the screw body can be driven by the grab handle to rotate towards a locking direction opposite to the disassembly direction by taking the rod body as an axis, when the anti-disassembly ratchet structure is meshed with the locking ratchet structure, the limiting groove is used for the convex column to penetrate, so that the anti-disassembly ratchet structure cannot be staggered relative to the locking ratchet structure, and the screw body can be driven by the grab handle to rotate towards the disassembly direction by taking the rod body as the axis.

2. The tamper-evident screw of claim 1, wherein: the locking ratchet structure is provided with a plurality of force applying surfaces which extend along the length direction of the holding part and are arranged at intervals in a ring shape, and a plurality of abutting surfaces which are respectively positioned between two adjacent force applying surfaces, the abutting surfaces extend obliquely relative to the force applying surfaces, the anti-dismantling ratchet structure is provided with a plurality of force applying surfaces which extend backwards and are arranged at intervals in a ring shape, and a plurality of sliding surfaces which are respectively positioned between two adjacent force applying surfaces, the gradient of the sliding surfaces corresponds to the abutting surfaces, when the force applying surfaces of the screw body are respectively and continuously abutted by the force applying surfaces of the holding handle, the screw body can be driven by the holding handle to rotate towards the locking direction, when the sliding surfaces of the screw body are respectively and continuously abutted by the abutting surfaces of the holding handle, and the convex column penetrates into the limiting groove, so that the screw body cannot axially displace along the sliding surfaces, the screw body can be driven by the grab handle to rotate towards the disassembly direction.

3. The tamper-evident screw of claim 1, wherein: the round pin is revolved in location includes two certainly the radial projection that extends in the front end both sides of the body of rod, the both sides of leg form two intercommunications respectively join the groove and follow the spacing groove that the dismantlement direction extends, join the groove have by the base wall with the leg defines and is applicable to the confession the main tank portion that the body of rod penetrated, and two be formed at the rear side of leg and intercommunication the positioning groove portion of main tank portion, positioning groove portion communicates respectively the spacing groove supplies the projection can penetrate to displaceably the spacing groove, in order to restrict the unable axial displacement of grab handle.

4. The utility model provides a locking tool, is applicable to will prevent tearing open the screw dismouting in the exterior structure, prevent tearing open the screw and contain screw body and buckle structure, the screw body include the spiral shell head and from the front side of spiral shell head extends forward and can locate the screw rod of exterior structure, the spiral shell head has the ratchet structure of preventing tearing open that is located the rear side, and the opening by the spiral shell head hole that the ratchet structure of preventing tearing open around, buckle structure install in the spiral shell head hole to including base wall and the leg wall that extends backward from the outer fringe of base wall, base wall and leg wall define the linking groove that the opening is backward, the leg forms at least one intercommunication the linking groove and along the spacing groove of dismantling the direction extension, the spacing groove with the rear side interval of leg, its characterized in that, locking tool contains:

the grab handle comprises a holding part, a pivoting groove which penetrates through the holding part in a front-back mode, and a locking ratchet structure which is arranged at the front end of the holding part and surrounds an opening of the pivoting groove, wherein the locking ratchet structure is suitable for being meshed with the anti-dismantling ratchet structure; and

the positioning rotary pin comprises a rod body which extends axially and can be penetrated into the pivoting groove in a pivoting way and at least one convex column which extends radially from the front end of the rod body, the convex column is exposed outside the locking ratchet structure and can penetrate into the connecting groove to the limiting groove in a displacement way so as to limit the handle from being incapable of moving axially,

when the locking ratchet structure is meshed with the anti-dismantling ratchet structure, the grab handle can drive the screw body to rotate towards a locking direction opposite to the dismantling direction by taking the rod body as an axis, and when the locking ratchet structure is meshed with the anti-dismantling ratchet structure, the convex column penetrates into the limiting groove, so that the locking ratchet structure cannot be staggered relative to the anti-dismantling ratchet structure, and the grab handle can drive the screw body to rotate towards the dismantling direction by taking the rod body as the axis.

5. The locking tool of claim 4, wherein: the clamping structure can be pivotally arranged in the inner hole of the screw head, the connecting groove is provided with at least one positioning groove part extending forwards from the rear side surface of the surrounding wall, the grab handle further comprises at least one clamping block protruding forwards from the front end of the holding part, and the clamping block is suitable for penetrating into the positioning groove part so as to limit the clamping structure from being incapable of pivoting.

6. The locking tool of claim 4, wherein: the locking tool further comprises a pivoting handle which can be pivotally arranged at the rear end of the holding part, the pivoting handle is connected to one end, away from the convex column, of the rod body, and when the pivoting handle rotates by taking the rod body as an axis, the convex column can be driven to move in the limiting groove.

7. The locking tool of claim 6, wherein: the pivot handle has axial extension's linking convex part, and at least one radial extension's location convex part, the portion of gripping is kept away from one side of closure ratchet structure forms axial extension's grab handle and links up the groove, and at least one intercommunication the grab handle links up the groove and follows the grab handle spacing groove that the dismantlement direction extends, the grab handle links up the groove and supplies the location convex part penetrate to the grab handle spacing groove makes the pivot handle towards can push up when the dismantlement direction rotates and support in the cell wall of grab handle spacing groove and drive the grab handle rotates.

8. A screw lock kit, comprising:

the tamper-evident screw of claim 1; and

the locking tool of claim 4 used in conjunction with the tamper screw.