TWI778809B - Tamper Screws, Locking Tools and Locking Tool Sets - Google Patents

Abstract

An anti-removal screw, a locking tool and a screw-lock tool set, the screw-lock tool set includes the anti-removal screw and the locking tool. The locking tool includes a handle and a positioning screw. The handle includes a locking ratchet structure. The positioning screw includes a convex post. The anti-removal screw includes a screw body and a buckle structure. The screw body has an anti-removal ratchet structure and a screw head inner hole that can be engaged with the locking ratchet structure. The snap structure is installed in the inner hole of the screw head, and defines an engaging groove and a limiting groove that communicates with the engaging groove and extends along a dismounting direction. Through the limiting slot for the protruding post to penetrate, the anti-removal ratchet structure cannot be displaced relative to the locking ratchet structure, and can be driven by the handle to rotate toward the dismounting direction. In this way, the anti-removal screw needs to be disassembled through the locking tool, so the purpose of good anti-theft effect can be achieved.

Description

Tamper Screws, Locking Tools and Locking Tool Sets

The present invention relates to an anti-removal screw and a locking tool thereof, in particular to an anti-removal screw for anti-theft, a locking tool suitable for disassembling and assembling the anti-removal screw for anti-theft, as well as an anti-removal screw and its locking tool Tool set for screw lock.

The existing screws can usually be removed using a conventional screwdriver, so that the device can be easily removed with the risk of theft when it is installed in an external area through the existing screws. Therefore, how to avoid the easy removal of screws has become a topic worthy of research by manufacturers.

Therefore, the purpose of the present invention is to provide an anti-removal screw with good anti-theft effect.

Therefore, the anti-removal screw of the present invention is suitable for use with a locking tool to be disassembled and assembled to an external structure. The locking tool includes a handle and a positioning screw. The handle includes a holding portion and a locking ratchet structure disposed at the front end of the holding portion. The positioning screw includes a rod body extending axially and pivotably passing through the handle, and at least one protruding column radially extending from the front end of the rod body. The protruding post is exposed outside the locking ratchet structure.

The anti-removal screw includes a screw body and a buckle structure. The screw body includes a screw head and a screw rod extending forward from the front side of the screw head and capable of passing through the outer structure. The screw head has an anti-removal ratchet structure on the rear side, and an inner hole of the screw head whose opening is surrounded by the anti-removal ratchet structure. The anti-removal ratchet structure is suitable for engaging with the locking ratchet structure.

The buckle structure is installed in the inner hole of the screw head, and includes a base wall and a surrounding wall extending backward from the outer edge of the base wall. The base wall and the surrounding wall define a rearward engaging groove. The surrounding wall forms at least one limiting groove which communicates with the engaging groove and extends along a disassembly direction. The limiting groove is spaced from the rear side surface of the surrounding wall. The engaging groove is suitable for allowing the protruding post to displaceably penetrate into the limiting groove, so as to limit the axial displacement of the handle.

Wherein, when the anti-removal ratchet structure is engaged with the locking ratchet structure, the screw body can be driven by the handle to rotate in a locking direction opposite to the dismounting direction with the rod body as the axis. When the anti-removal ratchet structure is engaged with the locking ratchet structure, and the limiting slot is for the protruding post to penetrate, so that the anti-removal ratchet structure cannot be displaced relative to the locking ratchet structure, the screw body can Driven by the handle, it rotates toward the dismounting direction with the rod body as the axis.

In some embodiments, the locking ratchet structure has a plurality of force-applying surfaces extending along the length direction of the holding portion and arranged at annular intervals, and a plurality of force-applying surfaces respectively located between two adjacent force-applying surfaces. the abutting surfaces between them. The abutting surfaces extend obliquely with respect to the force applying surfaces. The anti-removal ratchet structure has a plurality of force-bearing surfaces extending backward and arranged at annular intervals, and a plurality of sliding surfaces respectively located between two adjacent force-bearing surfaces. The inclinations of the sliding surfaces correspond to the abutting surfaces. When the force-receiving surfaces of the screw body are continuously pressed against the force-applying surfaces of the handle, respectively, the screw body can be driven by the handle to rotate toward the locking direction. When the sliding surfaces of the screw body continue to be abutted by the abutting surfaces of the handle respectively, and the protruding post penetrates into the limiting groove, so that the handle cannot be displaced axially along the sliding surface , the screw body can be driven by the handle to rotate toward the disassembly direction.

In some embodiments, the positioning screw includes two protruding posts radially extending from both sides of the front end of the rod body. Two limiting grooves which communicate with the connecting groove and extend along the dismounting direction are respectively formed on both sides of the surrounding wall. The connecting groove has a main groove portion defined by the base wall and the surrounding wall and suitable for the rod body to penetrate, and two positioning groove portions formed on the rear side of the surrounding wall and communicating with the main groove portion. The positioning grooves are respectively communicated with the limiting grooves and allow the protruding posts to displaceably penetrate into the limiting grooves, so as to restrict the handle from not being able to move axially.

Therefore, another object of the present invention is to provide a locking tool that can be used with the aforementioned anti-removal screw and is easy to use.

Therefore, the locking tool of the present invention is suitable for disassembling and assembling an anti-removal screw to an external structure. The anti-removal screw includes a screw body and a buckle structure. The screw body includes a screw head and a screw rod extending forward from the front side of the screw head and capable of passing through the outer structure. The screw head has an anti-removal ratchet structure on the rear side, and an inner hole of the screw head whose opening is surrounded by the anti-removal ratchet structure. The buckle structure is installed in the inner hole of the screw head, and includes a base wall and a surrounding wall extending backward from the outer edge of the base wall. The base wall and the surrounding wall define a rearward engaging groove. The surrounding wall forms at least one limiting groove which communicates with the engaging groove and extends along a disassembly direction. The limiting groove is spaced from the rear side surface of the surrounding wall.

The locking tool includes a handle and a positioning screw. The handle includes a holding portion, a pivoting groove penetrating the holding portion front and rear, and a locking ratchet structure disposed at the front end of the holding portion and surrounding the opening of the pivoting groove. The locking ratchet structure is suitable for engaging with the anti-removal ratchet structure.

The positioning rotary pin includes a rod body extending axially and pivotably penetrating the pivot slot, and at least one protruding column radially extending from the front end of the rod body. The protruding post is exposed outside the locking ratchet structure and can displaceably penetrate the engaging groove to the limiting groove, so as to restrict the handle from not being able to move axially.

Wherein, when the locking ratchet structure is engaged with the anti-removal ratchet structure, the handle can drive the screw body to rotate in a locking direction opposite to the dismounting direction with the rod body as the axis. When the locking ratchet structure is engaged with the anti-removal ratchet structure, and the protruding post penetrates into the limiting groove, so that the locking ratchet structure cannot be displaced relative to the anti-removal ratchet structure, the handle can drive the The screw body rotates toward the dismounting direction with the rod body as the axis.

In some embodiments, the buckle structure is pivotally installed in the inner hole of the screw head. The engaging groove has at least one positioning groove portion extending forward from the rear side of the surrounding wall. The handle also includes at least one block protruding forward from the front end of the handle. The locking block is suitable for passing through the positioning groove to limit the locking structure from being unable to pivot.

In some embodiments, the locking tool further includes a pivot handle pivotally mounted on the rear end of the grip portion. The pivot handle is connected to one end of the rod body away from the protruding post. When the pivot handle rotates around the rod body, it can drive the protruding column to move in the limiting groove.

In some embodiments, the pivot handle has an axially extending engaging protrusion and at least one radially extending positioning protrusion. An axially extending handle engaging groove is formed on a side of the grip portion away from the locking ratchet structure, and at least one handle limiting groove communicating with the handle engaging groove and extending along the dismounting direction. The handle engaging groove allows the positioning protrusion to penetrate into the handle limiting groove, so that when the pivot handle is rotated in the disassembly direction, it can abut against the groove wall of the handle limiting groove and drive the handle to rotate .

Therefore, another object of the present invention is to provide a screw lock tool set with good anti-theft effect and convenient use.

Therefore, the screw lock tool set of the present invention includes the aforementioned anti-removal screw and the aforementioned locking tool. The locking tool is used in conjunction with the anti-removal screw.

The effect of the present invention is that the protruding posts can be rotated and penetrated from the corresponding connecting grooves in the dismounting direction through the limiting grooves, so that the anti-dismantling ratchet structure cannot be relative to the locking ratchet. The structure is dislocated, and can be driven by the pivot handle to rotate toward the disassembly direction. In this way, in the case of using a common tool (without a positioning screw), even if it can engage with the anti-removal ratchet structure, the anti-removal screw cannot be removed. That is to say, the anti-removal screw needs to have the positioning screw Only the locking tool can be disassembled, so the purpose of good anti-theft effect can be achieved. In addition, the pivot handle cooperates with the handle to drive the screw body to rotate in the locking direction or the dismounting direction with the rod body as the axis, so that the user can assemble by holding the pivot handle with one hand Or remove the anti-removal screw to achieve the effect of convenient use. Furthermore, when the user removes the anti-removal screw, he can also rotate the pivot handle with one hand to drive the positioning screw to rotate, so that the protruding posts penetrate into the limiting slots respectively and together with the grip The handle rotates synchronously, which makes the locking tool easier to use and achieves the effect of convenient use.

Referring to FIGS. 1 to 4 , it is an embodiment of the screw lock tool set of the present invention. The screw lock tool set includes an anti-removal screw 1 and a locking tool 4 used with the anti-removal screw 1 . The locking tool 4 is suitable for screwing the anti-removal screw 1 to an external structure 9 , and can also remove the anti-removal screw 1 after being loosened from the external structure 9 . The external structure 9 may be a structure that needs to be assembled or fixed, such as a casing, a wall, etc., but is not limited to a specific form. In this embodiment, although the number of the anti-removal screw 1 and the locking tool 4 is taken as an example, in various situations such as use, manufacture, and sale, the anti-removal screw 1 and the locking tool of the screw locking tool set are The tools 4 are not limited to a specific number of combinations, but are determined according to actual needs.

Referring to FIGS. 3 to 5 , the directional terms of the content described herein are first defined. In FIG. 5 , the right side of the locking tool 4 is defined as the “front side”, and the left side of the locking tool 4 is defined as the “rear side”. The locking tool 4 includes a handle 5 , a positioning pin 6 pivotably penetrated through the handle 5 and one end exposed at the front end of the handle 5 , and a rear end connected to the positioning pin 6 The pivot handle 7 is pivotally mounted on the rear end of the handle 5 . The handle 5 includes a gripping portion 51 , a locking ratchet structure 52 disposed at the front end of the gripping portion 51 and surrounding the positioning knob 6 , a front and rear through the gripping portion 51 and opening by the locking ratchet A pivot slot 53 surrounded by the tooth 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 . A handle engaging groove 511 extending in the axial direction X and two handle limiting grooves 512 respectively connecting two sides of the handle engaging groove 511 and extending along a dismounting direction φ are formed on the rear side of the grip portion 51 . In this embodiment, the number of the locking blocks 54 and the number of the handle limiting grooves 512 may also be one or more than three, which is not limited to a specific number.

The locking ratchet structure 52 has a sawtooth shape, 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 force-applying surfaces respectively located adjacent to each other. Abutting surfaces 522 between 521 . The abutting surfaces 522 extend obliquely with respect to the force applying surfaces 521 . In this embodiment, the force-applying surfaces 521 extend along the axial direction X of the positioning pin 6 , so that when the locking ratchet structure 52 pivots around the positioning pin 6 , the force-applying surfaces The 521 can be turned with maximum torque.

The pivot handle 7 has an engaging protrusion 71 extending in the axial direction X and pivotably penetrating the handle engaging groove 511 , and two positioning protrusions 72 extending radially r from two sides of the engaging protrusion 71 , respectively. , and an engaging through hole 73 extending through the engaging protrusion 71 in the axial direction X and aligning with the pivoting groove 53 . The positioning protrusions 72 respectively penetrate into the handle limiting grooves 512 from both sides of the handle engaging groove 511 in a displaceable manner. In this embodiment, the engaging through hole 73 is for the rear end of the positioning screw 6 to penetrate, so that the pivot handle 7 is fixed with the positioning screw 6 and can drive the positioning screw 6 to rotate. When the pivoting handle 7 rotates toward the dismounting direction φ with the positioning screw 6 as the axis, the positioning protrusions 72 can respectively penetrate into the handle limiting grooves 512 to restrict the pivoting handle 7 from being unable to axially X is displaced, and abuts against the groove wall of the handle limiting groove 512 to drive the handle 5 to rotate, so as to increase the torque applied by the locking tool 4 to the anti-removal screw 1, so that the locking tool 4 can be used more labor-saving. In addition, the number of the positioning protrusions 72 corresponding to the number of the handle limiting grooves 512 may also be one or three or more, which is not limited to a specific number.

The positioning pin 6 includes a rod body 61 extending in the axial direction X and pivotably passing through the pivot slot 53 , and two protruding posts 62 extending radially r from both sides of the front end of the rod body 61 . The protruding posts 62 are exposed outside the locking ratchet structure 52 . The rod body 61 has a support portion 611 connected to the protruding posts 62 and pivotably penetrated into the pivot slot 53 , and a connecting end extending backward from the support portion 611 and connected to the pivot handle 7 . Section 612. In this embodiment, the engaging end portion 612 is detachably inserted into the engaging through hole 73 from the pivoting slot 53 , so as to facilitate the assembly of the positioning screw 6 , the handle 5 and the pivoting handle 7 . However, the assembling method of the locking tool 4 is not limited to the above, the connecting end 612 can also be fixed to the pivot handle 7, and the handle 5 is provided on the positioning screw 6 by two separable parts. the two sides of the lock tool 4 can also be assembled in this way. The supporting portion 611 and the engaging through hole 73 have different radial cross-sectional shapes. After the engaging end portion 612 penetrates the engaging through hole 73 , the supporting portion 611 is blocked by the engaging protrusion 71 and cannot move backward. In addition, the number of the protruding posts 62 can be one, which is convenient for manufacture, or more than three, which makes the design of the positioning screw 6 more complicated and difficult to reproduce.

Referring to FIG. 1 , FIG. 2 , FIG. 4 and FIG. 5 , the anti-removal screw 1 includes a screw body 2 and a buckle structure 3 . The screw body 2 includes a screw head 21 and a screw rod 22 extending forward from the front side of the screw head 21 and capable of passing through the outer structure 9 . The front end of the screw 22 is screw-shaped for locking the outer structure 9 . The screw head 21 has an annular outer wall 211 and an anti-removal ratchet structure 212 connected to the rear side of the outer wall 211 . The outer wall 211 defines a screw head inner hole 213 whose opening is surrounded by the anti-removal ratchet structure 212 . The anti-removal ratchet structure 212 is suitable for engaging with the locking ratchet structure 52, and the shape of the anti-removal ratchet structure 212 is serrated corresponding to the shape of the locking ratchet structure 52, and has several rearward extending and The force-bearing surfaces 215 are arranged annularly at intervals, and a plurality of sliding surfaces 216 are respectively located between two adjacent force-bearing surfaces 215 . The inclinations of the sliding surfaces 216 correspond to the abutting surfaces 522 . More specifically, each of the sliding surfaces 216 extends obliquely from the front side edge of one of the two adjacent force-bearing surfaces 215 toward the disassembly direction φ to the other of the two adjacent force-bearing surfaces 215 . the rear edge of the . In this embodiment, the force-receiving surfaces 215 face a locking direction θ opposite to the dismounting direction φ, and the extending directions of the force-receiving surfaces 215 correspond to the force-applying surfaces 521 along the axis of the rod body 61 . Extending toward X, the force-receiving surfaces 215 can be used to block the force-applying surfaces 521, and the locking ratchet structure can be avoided when the locking tool 4 drives the anti-removal screw 1 to rotate in the locking direction θ 52 slides toward the locking direction θ relative to the anti-removal ratchet structure 212 , so as to achieve the purpose of driving the anti-removal screw 1 to rotate in the locking direction θ by the locking tool 4 .

The buckle structure 3 is installed in the inner hole 213 of the screw head, 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 an engaging groove 33 which opens backward. The engaging groove 33 has a main groove 331 defined by the base wall 31 and the surrounding wall 32 and through which the rod body 61 penetrates, and two respectively formed on both sides of the rear side of the surrounding wall 32 and communicating with the main groove the positioning groove part 332 of the part 331 . The surrounding wall 32 forms two limiting grooves 34 respectively communicating with the positioning grooves 332 and extending along the disassembly direction φ. Each positioning groove 332 and the corresponding limiting groove 34 are formed on the surrounding wall 32 for Each of the protruding posts 62 penetrates and slides into the L-shaped groove. The limiting grooves 34 are spaced apart from the rear side surface of the surrounding wall 32 . The positioning grooves 332 respectively allow the protruding posts 62 to penetrate into the limiting slots 34 in a displaceable manner, and can restrict the handle 5 from facing each other when the protruding posts 62 are located in the limiting slots 34 . The anti-removal screw 1 is displaced to the rear side of the axial direction X without being displaced relative to the screw body 2 . In this embodiment, the buckle structure 3 is rotatably installed in the inner hole 213 of the screw head, but can also be fixed in the inner hole 213 of the screw head so as not to rotate. The positioning grooves 332 are respectively inserted into the locking blocks 54 to restrict the locking structure 3 from rotating relative to the handle 5 . In addition, the number of the positioning grooves 332 and the number of the limiting grooves 34 can also be one or three or more corresponding to the number of the protruding posts 62 , so that at least one protruding post 62 can be stuck against the limit. In the slot 34, the design of the buckle structure 3 can be customized according to anti-theft requirements.

Referring to FIGS. 5 and 6, when the anti-removal screw 1 needs to be screwed to the external structure 9, the screw 22 of the anti-removal screw 1 can be aligned with the lock hole of the external structure 9, and then the lock The tool 4 is inserted into the inner hole 213 of the screw head along the axial direction X, so that the anti-removal ratchet structure 212 is engaged with the locking ratchet structure 52, and the protruding posts 62 of the positioning screw 6 are respectively penetrated into the screw head. At the front ends of the positioning grooves 332 , the locking blocks 54 of the handle 5 respectively penetrate into the rear ends of the positioning grooves 332 . Next, as shown in FIG. 5 , the pivoting handle 7 is rotated toward the locking direction θ with the rod body 61 as the axis, and the handle 5 is driven to rotate in the same direction. At this time, the protruding posts 62 and the The clamping blocks 54 all abut against the groove walls of the positioning grooves 332 , and the force applying surfaces 521 continue to abut against the force receiving surfaces 215 respectively to drive the screw body 2 to rotate in the locking direction θ , so that the shaft head abuts against the outer structure 9 to lock the anti-removal screw 1 . Conversely, when the anti-removal screw 1 needs to be removed from the external structure 9, as shown in FIG. The blocks 54 respectively penetrate into the positioning grooves 332 , and then the pivot handle 7 is rotated with the rod body 61 as the axis in the disassembly direction φ to drive the protruding posts 62 to penetrate the limiting grooves 34 respectively. At this time, the positioning protrusions 72 also penetrate into the handle limiting grooves 512 respectively. Next, continue to rotate the pivot handle 7 toward the dismounting direction φ, after the positioning protrusions 72 move to the innermost end of the handle limiting grooves 512 and press against the groove wall, the handle 5 can be Together with the pivoting handle 7 rotates in the dismantling direction φ, at the same time, since the protruding posts 62 are located in the limiting grooves 34, the locking tool 4 cannot face the anti-dismantling in the axial direction X to the rear side relative to the anti-dismantling The screw 1 moves, so the abutting surfaces 522 will continue to press tightly against the sliding surfaces 216, so the rotation of the locking tool 4 in the dismounting direction φ will make the abutting surfaces 522 continue to exert force respectively. On the sliding surfaces 216, the screw body 2 can be driven to rotate in the disassembly direction φ, so that the shaft head moves in a direction away from the external structure 9, and the anti-removal screw 1 can be disassembled from the external structure 9. . In the above disassembly process, the pivot handle 7 is rotated first, and then the handle 5 is driven by the pivot handle 7 to rotate together, so that the user can perform the disassembly operation in a simple and labor-saving manner.

To sum up, through the limiting grooves 34, the protruding posts 62 can be rotated and penetrated from the corresponding connecting grooves 33 along the dismounting direction φ, so that the anti-dismantling ratchet structure 212 cannot be relative to the The locking ratchet structure 52 is dislocated, and can be driven by the pivot handle 7 to rotate toward the dismounting direction φ. In this way, in the case of using a common tool (without a positioning screw), even if it can engage with the anti-removal ratchet structure 212, the anti-removal screw 1 cannot be disassembled. That is to say, the anti-removal screw 1 needs to be Only the locking tool 4 of the positioning screw 6 can be disassembled, so the purpose of good anti-theft effect can be achieved. In addition, the pivot handle 7 cooperates with the handle 5 to drive the screw body 2 to rotate in the locking direction θ or the dismounting direction φ with the rod body 61 as the axis, so that the user can hold the screw body with one hand. The anti-removal screw 1 can be assembled or disassembled by pivoting the handle 7 to achieve the effect of convenient use. Furthermore, when the user removes the anti-removal screw 1, he can also rotate the pivot handle 7 with one hand to drive the positioning pin 6 to rotate, so that the protruding posts 62 penetrate into the limiting slots 34 respectively. The inside and together with the handle 5 rotate synchronously, so that the locking tool 4 can be used more easily, and the effect of convenient use can be achieved, so it can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention, and should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the patent specification are still included in the scope of the present invention. within the scope of the invention patent.

1: Anti-disassembly screw 2: Screw body 21: screw head 211: Outer Wall 212: Anti-removal ratchet structure 213: Inner hole of screw head 215: Forced surface 216: Slip surface 22: Screw 3: Snap structure 31: base wall 32: Walls 33: Connection slot 331: Main groove 332: Positioning groove 34: Limit slot 4: Locking tool 5: Grip 51: Grip 511: Grip engagement slot 512: Grip limit slot 52: Locking ratchet structure 521: Force Surface 522: Against the surface 53: Pivot slot 54: Card block 6: Positioning screw 61: Rod body 611: Support Department 612: Connection end 62: Column 7: Pivot handle 71: Connection convex part 72: Positioning convex part 73: Connecting through holes 9: External structure X: Axial r: radial θ: Locking direction φ: Removal direction

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a perspective view illustrating the use relationship of an embodiment of the screw lock tool set of the present invention and an external structure; 2 is an exploded perspective view illustrating the external structure and a tamper-resistant screw and a locking tool of the embodiment; 3 is a perspective view from another perspective, illustrating the connection relationship of the external structure, the anti-removal screw and the locking tool; 4 is an exploded perspective view of the same perspective as FIG. 3, illustrating the external structure, the tamper-resistant screw and the locking tool; 5 is a left side view illustrating that the locking tool drives the anti-removal screw to rotate in a locking direction, and a head of the anti-removal screw abuts against the external structure; and 6 is a left side view, illustrating that the locking tool drives the anti-removal screw to rotate in a disassembly direction, and the screw head is spaced from the external structure.

1: Anti-disassembly screw

21: screw head

211: Outer Wall

212: Anti-removal ratchet structure

213: Inner hole of screw head

215: Forced surface

216: Slip surface

22: Screw

3: Snap structure

33: Connection slot

34: Limit slot

4: Locking tool

5: Grip

51: Grip

52: Locking ratchet structure

54: Card block

61: Rod body

62: Column

7: Pivot handle

9: External structure

X: Axial

r: radial

θ: Locking direction

φ: Removal direction

Claims (8)

An anti-removal screw is suitable for use with a locking tool to be disassembled and assembled to an external structure, the locking tool includes a handle and a positioning screw, the handle includes a grip portion and a set on the grip The locking ratchet structure at the front end of the holding part, the positioning rotary pin includes a rod body extending axially and pivotably passing through the handle, and at least one protruding column radially extending from the front end of the rod body, The protruding post is exposed outside the locking ratchet structure, and the anti-removal screw includes: a screw body, comprising a screw head and a screw rod extending forward from the front side of the screw head and passing through the outer structure, the screw head has an anti-removal ratchet structure on the rear side, and an opening covered by the screw head an inner hole of the screw head surrounded by a tamper-resistant ratchet structure adapted to engage with the locking ratchet structure; and A snap-fit structure is installed in the inner hole of the screw head, and includes a base wall and a surrounding wall extending backward from the outer edge of the base wall, the base wall and the surrounding wall define an opening and rearward engaging groove, The surrounding wall forms at least one limiting groove that communicates with the engaging groove and extends along a disassembly direction, the limiting groove is spaced from the rear side of the surrounding wall, and the engaging groove is suitable for the protruding post to displaceably penetrate into the Limiting groove to limit the axial displacement of the handle, Wherein, when the anti-removal ratchet structure is engaged with the locking ratchet structure, the screw body can be driven by the handle to rotate in a locking direction opposite to the disassembly direction with the rod body as the axis. The dismantling ratchet structure is engaged with the locking ratchet structure, and the limiting slot is for the protruding post to penetrate, so that the anti-dismantling ratchet structure cannot be displaced relative to the locking ratchet structure, and the screw body can be held by the grip The handle is driven to rotate toward the dismounting direction with the rod body as the axis. The anti-removal screw according to claim 1, wherein the locking ratchet structure has a plurality of force-applying surfaces extending along the length direction of the holding portion and arranged at annular intervals, and a plurality of force-applying surfaces respectively located adjacent to each other. The abutting surface between the two force-applying surfaces, the abutting surfaces extend obliquely with respect to the force-applying surfaces, the anti-removal ratchet structure has a plurality of force-bearing surfaces extending backward and arranged at annular intervals, and a number of There are two sliding surfaces respectively located between two adjacent force-bearing surfaces, and the inclinations of the sliding surfaces correspond to the abutting surfaces. When the force-bearing surfaces of the screw body are respectively continuously affected by the handle The force-applying surfaces of the screw body are pressed against the force-applying surfaces, and the screw body can be driven by the handle to rotate in the locking direction. When the sliding surfaces of the screw body are continuously pressed against the abutting surfaces of the handle, And the protruding post penetrates into the limiting groove, so that the handle cannot be displaced axially along the sliding surface, and the screw body can be driven by the handle to rotate toward the dismounting direction. The anti-removal screw according to claim 1, wherein the positioning screw comprises two protruding columns radially extending from both sides of the front end of the rod body, and two sides of the surrounding wall respectively form two connecting grooves and extend along the A limiting groove extending in the disassembly direction, the engaging groove has a main groove portion defined by the base wall and the surrounding wall and suitable for the rod body to penetrate, and two formed on the rear side of the surrounding wall and communicated with the main groove The positioning grooves of the groove portion are respectively connected with the limiting grooves and allow the protruding posts to displaceably penetrate into the limiting grooves, so as to limit the axial displacement of the handle. A locking tool is suitable for disassembling and assembling an anti-removal screw to an external structure. The anti-removal screw includes a screw body and a snap structure. The screw body includes a screw head and a front side of the screw head. A screw rod that extends and can pass through the outer structure, the screw head has an anti-removal ratchet structure on the rear side, and an inner hole of the screw head whose opening is surrounded by the anti-removal ratchet structure, the snap structure is installed In the inner hole of the screw head, it includes 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 an opening and a rearward engaging groove, and the surrounding wall forms at least one communication The engaging groove is a limit groove extending along a disassembly direction, the limit groove is spaced from the rear side of the surrounding wall, and the locking tool includes: a handle, comprising a holding portion, a pivoting groove penetrating the holding portion front and rear, and a locking ratchet structure disposed at the front end of the holding portion and surrounding the opening of the pivoting groove, the locking ratchet the tooth structure is adapted to engage the tamper-resistant ratchet structure; and A positioning screw includes a rod body extending axially and pivotably penetrating the pivot slot, and at least one protruding post radially extending from the front end of the rod body, the protruding post being exposed from the locking spine The tooth structure can displaceably penetrate the engaging groove to the limiting groove, so as to limit the axial displacement of the handle, Wherein, when the locking ratchet structure is engaged with the anti-removal ratchet structure, the handle can drive the screw body to rotate in a locking direction opposite to the dismounting direction with the rod body as the axis. The tooth structure is engaged with the anti-removal ratchet structure, and the protruding column penetrates into the limiting slot, so that the locking ratchet structure cannot be displaced relative to the anti-removal ratchet structure, and the handle can drive the screw body to use the The rod body is pivoted in the direction of disassembly. The locking tool according to claim 4, wherein the snap structure is pivotally installed in the inner hole of the screw head, and the engaging groove has at least one positioning groove portion extending forward from the rear side of the surrounding wall, The handle also includes at least one latching block protruding forward from the front end of the holding portion, and the latching block is suitable for penetrating the positioning groove portion to restrict the latching structure from being unable to pivot. The locking tool according to claim 4, wherein the locking tool further comprises a pivot handle pivotally mounted on the rear end of the grip portion, the pivot handle is connected to the rod body away from the protrusion One end of the column can drive the protruding column to move in the limiting groove when the pivot handle rotates with the rod body as the axis. The locking tool of claim 6, wherein the pivot handle has an axially extending engagement protrusion and at least one radially extending positioning protrusion, the grip portion being remote from the locking ratchet structure A handle engaging groove extending axially is formed on one side, and at least one handle limiting groove communicating with the handle engaging groove and extending along the dismounting direction, the handle engaging groove allows the positioning protrusion to penetrate into the handle The handle limiting groove enables the pivoting handle to abut against the groove wall of the handle limiting groove and drive the handle to rotate when the pivot handle rotates in the dismounting direction. A screw lock tool set comprising: a tamper-resistant screw as described in claim 1; and The locking tool as described in claim 4 is used in conjunction with the anti-removal screw.

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