JP3134812U - Anti-theft and loosening screw structure - Google Patents

Abstract

An anti-theft / loosening prevention screw structure is provided.
An anti-theft / loosening prevention screw structure is a structure that cannot be turned with an ordinary hand tool, and comprises a washer 40 and a screw 50. The washer has a hole 41 in the center, and the top surface has at least one single unit. Having a first serrated surface formed by directional wedge teeth 43, the washer bottom surface having a radial arrangement of pointed fits 44. The screw has a screw head 51 and a screw rod 53, and the outer shape of the screw head is a conical shape that forms a light slip, and the top surface of the screw head has a circular recess 512 surrounded by a convex ring 511, or two recesses, or It has two or more barbs 513. A screw structure is provided which has a special tool for tightening a screw from a spine portion and cannot be withdrawn even if applied in the opposite direction, and has a slack prevention and anti-theft effect.
[Selection] Figure 2

Description

  The present invention relates to an anti-theft / loosening prevention screw structure, and in particular, a screw-shaped screw head having at least one spine and a washer having a wedge-shaped slope and a pointed fit on both sides, and loosening after fastening the screw. It relates to a difficult screw structure.

FIG. 1 shows a known locking screw structure, which mainly includes a screw 10 and a washer 20. The washer 20 is circular and has at least a concave opening 24 on its outer shape, one surface of which has a first wedge-shaped surface 21 formed of at least a wedge-shaped tooth 22, and the first wedge-shaped tooth 22 is composed of a surface 221 and an inclined surface 222. . The other surface is provided with at least one cusp 23, and the cross-section of the cusp 23 is a right triangle whose slope is along the fastening direction of the screw 10. The screw 10 has a screw head 11 and a screw rod 12, and the bottom surface of the screw head 11 has a second wedge-shaped surface 111 corresponding to the molding of the first wedge-shaped surface 21 of the washer 20. Therefore, when the screw 10 is fastened, the surface 221 between the corresponding wedge-shaped surfaces simultaneously rotates, and as the screw is gradually fastened, the pressure applied by the washer 20 to the surface of the object 30 increases until the screw cannot be rolled. The fitting 23 is inserted into the property 30. When exiting, the slopes between the corresponding wedge-shaped surfaces interfere with each other and squeeze, and the prevention effect that the pointed fitting 23 is inserted into the object increases the difficulty of screw turning, and it is easy to fasten the screw. A slack prevention effect that is difficult to exit is achieved. When necessary, the screw head 11 and the washer recess 24 are not loosened unless they are applied with a special hand tool. The known screw structure has a considerable anti-loosening effect by the screw, but since the screw head 11 is a structure that relies on the application force of the hand tool, there is a possibility that the screw is turned by a lateral application force.

An object of the present invention is to provide an anti-theft screw that is tightened by a dedicated tool and has a locking effect.

  The screw structure according to the present invention has at least one spine on the spindle head surface of the screw-shaped screw, and has washers each having a wedge-shaped slope and a pointed fit on both sides, and is difficult to loosen after fastening the screw.

  According to the present invention, an anti-theft screw is provided which is tightened by a dedicated tool and has a locking effect.

As shown in FIG. 2, the present invention includes a washer 40 and a screw 50.

The washer 40 is a circular washer having a perforation 41 in the center, and the top surface of the washer 40 has a first serrated surface 42 formed by at least one unidirectional wedge-shaped tooth 43, and the unidirectional wedge-shaped tooth 43 includes a slope 431 and It is constituted by the vertical surface 432, and the heights of the outer edge and the inner edge of the inclined surface 431 are the same under the same circular angle. The bottom surface of the washer 40 is provided with at least one radial arrangement pointed fit 44. The cross section of the tip 44 is constituted by a slope 441 and a vertical wall 442, and the slope 441 is installed in the fastening direction. The circular outer shape of the washer 40 is provided with at least one recess 45 and is removed by applying force with a dedicated tool.

The screw 50 has a screw head 51 and a screw rod 53. The outer shape of the screw head 51 is a conical shape that forms a light slip, and the top surface of the screw head 51 has a circular recess 512 surrounded by a convex ring 511. It has two or two or more barbs 513, and is applied with a special tool to execute screwing. The bottom surface of the screw head 51 has a second wedge-shaped surface 52 corresponding to the first wedge-shaped surface 42 of the washer 40.

As shown in FIGS. 3 and 4, in addition to the above-described structure, when the object 60 is to be secured, a special tool 70 having a groove on one end and engaging with the spine teeth 513 is used. The positioning effect of the dedicated tool 70 is increased by the convex ring 511, and the force is applied stably until the screw is tight. When the screw 50 is in a reversing tendency, the inclined surfaces between the two wedge-shaped surfaces are pushed toward each other, and the washer 40 is further tightly engaged toward the pointed fitting 44 on the surface of the object 60, thereby achieving a loosening prevention effect. Since the conical shape of the screw head 51 cannot be clamped by a general tool, and the unidirectional barbs 513 cannot be retracted in the opposite direction by the tool, an anti-theft effect is generated. At the time of removal, unless the concave opening 45 of the washer 40 fixed by the dedicated tool is applied, the screw does not loosen.

In order to prevent one dedicated tool from being used in actual use, the two or more barbs 513 are designed to be asymmetrical angles.

  In the present invention, preferred embodiments have been disclosed as described above. However, these are not intended to limit the present invention, and any person who is familiar with the technology can use various methods within the spirit and scope of the present invention. Therefore, the protection scope of the invention is based on the contents specified in the claims of the utility model.

It is a well-known external view of a screw structure. It is a three-dimensional view of the present invention. It is sectional drawing of this invention. It is a state figure screwed with the exclusive tool of this invention.

Explanation of symbols

10 Screw 11 Screw head 111 Second wedge-shaped surface 12 Screw rod 20 Washer 21 First wedge-shaped surface 22 Wedge-shaped tooth 221 Surface 222 Slope 23 Pointed fitting 30 Property 40 Washer 41 Perforation 42 First wedge-shaped surface 43 Unidirectional wedge-shaped tooth 431 Slope 432 Surface 44 Point fitting 441 Slope 442 Vertical wall 45 Concave 50 Screw 51 Screw head 511 Convex ring 512 Concave 513 Spinous teeth 52 Second wedge-shaped surface 53 Screw rod 60 Property 70 Dedicated tool

Claims (3)

An anti-theft / loosening prevention screw structure comprising a washer and a screw, the washer having a hole in the center, and a top surface having a first serrated surface formed by at least one unidirectional wedge-shaped tooth, The wedge-shaped tooth in the direction is constituted by a slope and a vertical surface, and the bottom surface of the washer has a pointed fit of at least one radial arrangement, characterized in that the screw has a screw head and a screw, and the outer shape of the screw head Is a conical shape that forms a light slip, and the top surface of the screw has a circular recess surrounded by a convex ring, and the recess has two or more spines, and is applied with a special tool and screwed. A screw structure according to claim 1, wherein the screw head bottom surface has a second wedge-shaped surface corresponding to the first wedge-shaped surface of the washer. 2. The screw structure according to claim 1, wherein the sharp fitting is constituted by a slope and a vertical wall, and the slope installation direction is along a fastening direction. The screw structure according to claim 1, wherein the spine teeth are arranged equally or unequally.