JP2021028525A - Antitheft bolt cap - Google Patents

Abstract

To provide an antitheft bolt cap capable of preventing a fixed object from being stolen while securing excellent workability.SOLUTION: An anti-theft bolt cap 1 comprises: a cap body 2 comprising a substantially cylindrical joint part 21 having a screwable bolt hole 23 formed at the tip of a bolt B, and a head part 22 provided at the tip of the joint part 21; and a sleeve 3 that is externally inserted into the joint part 21 so that it can idle with respect to the joint part 21. An outer peripheral surface 24 of the head part 22 is formed by gradually reducing a diameter along an axial direction S of the cap body 2. A wrench hole 26 corresponding to a non-general purpose tightening tool is formed at the tip of the head part 22. The sleeve 3 houses a nut N fastened to the bolt B.SELECTED DRAWING: Figure 3

Description

The present invention relates to an anti-theft bolt cap.

In recent years, there have been frequent cases of stealing a fixed object by removing the bolt from the fixed object fixed in a predetermined position with a bolt. The object to be fixed can be fixed to the floor, wall, ceiling, etc. with bolts and nuts, and is, for example, an outdoor unit, a bicycle saddle, or the like.

The anti-theft tool described in Patent Document 1 is a device in which an article 7 is fixed to a member to be fixed 6 with a bolt 5 and a synthetic resin anti-theft tool 1 is coated and fitted to the head portion 5a of the bolt 5. The anti-theft tool 1 is formed in a cylindrical shape, and is configured so that the bolt 5 cannot be rotated even with a tool. The reference numeral is the reference numeral in Patent Document 1.

Japanese Unexamined Patent Publication No. 2012-241340

However, in the anti-theft tool described in Patent Document 1 as described above, after the article 7 is fixed to the fixed member 6 with the bolt 5, the anti-theft tool 1 is fitted to the head 5a of the bolt 5 with a hammer or the like. There is a problem that the installation work of the anti-theft tool 1 is complicated and takes time.

Therefore, there arises a technical problem to be solved in order to prevent theft of the fixed object to be fixed while ensuring good workability, and an object of the present invention is to solve this problem. ..

In order to achieve the above object, the anti-theft bolt cap according to the present invention is an anti-theft bolt cap that can be attached to a bolt that fixes an object to be fixed, and has a bolt hole that can be screwed into the tip of the bolt. A cap body having a formed substantially cylindrical joint portion and a head provided at the tip of the joint portion, and a sleeve externally attached to the joint portion so as to be idling with respect to the joint portion. The outer peripheral surface of the head is gradually reduced in diameter along the axial direction of the cap body, and a wrench hole corresponding to a non-general purpose tightening tool is formed at the tip of the head. The sleeve contains a nut fastened to the bolt.

According to this configuration, the cap body can be tightened or loosened to the bolt by attaching a non-general purpose tightening tool to the wrench hole and rotating the joint portion. Further, since the sleeve can idle with respect to the joint portion, even when a person who attempts to steal the object to be stolen grips the sleeve with a wrench or the like, the joint portion is prevented from rotating together with the sleeve. .. Further, since the sleeve accommodates the nut fastened to the bolt, a person who attempts to steal the object to be fixed cannot loosen the nut with a wrench or the like. Further, since the outer peripheral surface of the head is formed by gradually reducing the diameter along the axial direction of the cap body, a person who attempts to steal the object to be fixed cannot grasp the head with a wrench or the like, so that the bolt The cap body screwed to the cap body is prevented from unintentionally loosening. The "non-general purpose tightening tool" means a dedicated tightening tool excluding the easily available general purpose tightening tool (for example, a hexagon wrench).

Further, in the anti-theft bolt cap according to the present invention, it is preferable that the outer peripheral surface of the head is formed in a tapered shape in which the diameter is gradually reduced along the axial direction of the cap body.

According to this configuration, the outer peripheral surface of the head is formed in a tapered shape that gradually reduces the diameter along the axial direction of the cap body, so that the head cannot be gripped with a wrench or the like, so that the head is screwed to the bolt. It is prevented that the worn cap body is unintentionally loosened.

Further, in the anti-theft bolt cap according to the present invention, it is preferable that the outer peripheral surface of the head is formed in a curved surface shape in which the diameter is gradually reduced along the axial direction of the cap body.

According to this configuration, since the outer peripheral surface of the head is formed in a curved surface shape in which the diameter is gradually reduced along the axial direction of the cap body, the head cannot be gripped by a wrench or the like, so that the head is screwed to the bolt. It is prevented that the cap body is unintentionally loosened.

Further, in the anti-theft bolt cap according to the present invention, it is preferable that the cap body is made of metal having a higher ionization tendency than the bolt.

According to this configuration, since a potential difference is generated between the cap body and the bolt, corrosion of the bolt can be suppressed.

Further, in the anti-theft bolt cap according to the present invention, it is preferable that the cap body is made of zinc.

According to this configuration, corrosion of the bolt can be suppressed by contacting the iron bolt with the zinc cap body having a high ionization tendency.

Further, in the anti-theft bolt cap according to the present invention, it is preferable that the cap body is made of brass.

According to this configuration, the iron bolt comes into contact with the brass cap body having a high ionization tendency, and the cap body having different potentials comes into contact with the bolt, so that corrosion of the bolt can be suppressed.

In the present invention, the sleeve can idle with respect to the joint portion while the nut is housed, and the outer peripheral surface of the head is formed by gradually reducing the diameter along the axial direction of the cap body, so that the bolt is screwed. While suppressing the unintentional loosening of the worn cap body, the cap body can be arbitrarily tightened or loosened to the bolt by using a non-general purpose tightening tool, so while ensuring the workability of the anti-theft bolt cap, Theft of the object to be fixed fixed to the bolt can be suppressed.

The perspective view which shows the anti-theft bolt cap which concerns on one Embodiment of this invention. A perspective view of the anti-theft bolt cap of FIG. 1 as viewed from the base end side. FIG. 1 is a cross-sectional view taken along the line AA of FIG. Front view, left side view and right side view showing the cap body. Front view and side view showing the sleeve.

An embodiment of the present invention will be described with reference to the drawings. In the following, when referring to the number, numerical value, quantity, range, etc. of components, it is limited to the specific number unless it is clearly stated or in principle it is clearly limited to the specific number. It is not a thing, and it may be more than or less than a specific number.

In addition, when referring to the shape and positional relationship of components, etc., unless otherwise specified or when it is considered that this is not the case in principle, those that are substantially similar to or similar to the shape, etc. shall be used. Including.

In addition, the drawings may be exaggerated by enlarging the characteristic parts in order to make the features easy to understand, and the dimensional ratios and the like of the components are not always the same as the actual ones. Further, in the cross-sectional view, hatching of some components may be omitted in order to make the cross-sectional structure of the components easy to understand.

FIG. 1 is a perspective view of the anti-theft bolt cap 1 as viewed from the tip side. FIG. 2 is a perspective view of the anti-theft bolt cap 1 as viewed from the base end side. FIG. 3 is a cross-sectional view taken along the line AA of FIG.

The nut N and the bolt B are for tightening and fixing the object to be fixed to a support member such as a floor, a wall, a pillar or a block. The object to be fixed is, for example, a bicycle saddle, an outdoor unit fixed on a pedestal or a block, a grating fixed on a gutter with a bolt, or the like.

The anti-theft bolt cap 1 is attached to the tip of the bolt B. The anti-theft bolt cap 1 includes a cap body 2 and a sleeve 3.

FIG. 4A is a left side view showing the cap body 2, FIG. 4B is a front view showing the cap body 2, and FIG. 4C is a right side view showing the cap body 2. Is.

The cap body 2 includes a joint portion 21 and a head portion 22. The joint portion 21 is formed in a substantially cylindrical shape, and a screwable bolt hole 23 is provided at the tip of the bolt B. The bolt holes 23 are formed over a predetermined distance from the base end surface of the joint portion 21 toward the tip end side. The size of the bolt hole 23 is set to, for example, M10.

The head 22 is provided at the tip of the joint portion 21. The head 22 is formed in a substantially truncated cone shape. The outer peripheral surface 24 of the head portion 22 is formed in a tapered shape so as to gradually reduce the diameter from the proximal end side to the distal end side along the axial direction D of the cap body 2.

A wrench hole 26 is formed in the tip surface 25 of the head portion 22. The wrench hole 26 is formed in a pentagonal shape. That is, the wrench hole 26 corresponds to a non-general purpose tightening tool (such as a hexagonal bar wrench). The "non-general-purpose tightening tool" means a dedicated tightening tool excluding easily available general-purpose tightening tools (for example, hexagonal wrench, Phillips screwdriver, etc.).

In FIGS. 3 and 4, the wrench hole 26 is formed in a blind hole shape, but the wrench hole 26 may be formed so as to communicate with the bolt hole 23. The size of the wrench hole 26 is set to, for example, M6.

The cap body 2 is made of zinc. Since the cap body 2 is made of zinc, corrosion of the bolt B can be suppressed by contact between the zinc cap body 2 having different potentials and the iron bolt B.

FIG. 5A is a front view showing the sleeve 3, and FIG. 5B is a side view showing the sleeve 3. The sleeve 3 is formed in a substantially cylindrical shape.

The sleeve 3 is made of zinc like the cap body 2, but may be made of any metal. The inner diameter of the insertion hole 31 of the sleeve 3 is set to be slightly larger than the outer diameter of the joint portion 21 or the square diameter of the nut N, whichever is larger (in this embodiment, the square diameter of the nut N). Therefore, the sleeve 3 is configured to be loosely fitted to the joint portion 21 and the nut N and idle with respect to the joint portion 21 and the nut N. Further, it is preferable that the outer diameter of the sleeve 3 is set to be substantially the same as or slightly larger than the outer diameter of the head 22.

Next, a procedure for attaching the anti-theft bolt cap 1 to the tip of the bolt B will be described.

First, the sleeve 3 is externally fitted to the joint portion 21, and the cap body 2 and the sleeve 3 are integrated.

Next, the bolt B is screwed into the cap body 2. Specifically, with the tip of the bolt B in contact with the bolt hole 23, the cap body 2 is rotated by rotating a tightening tool (not shown) set in the wrench hole 26 in a predetermined tightening direction, and the bolt B is rotated. The tip is screwed into the joint portion 21. The tightening tool is a non-general purpose dedicated tool, for example, an L-shaped bar wrench corresponding to the shape (pentagonal shape) of the wrench hole 26.

When the tip end side of the bolt B is screwed into the bolt hole 23 by a predetermined amount, the rotation of the cap body 2 is stopped and the tightening tool is removed from the wrench hole 26.

In this way, in the anti-theft bolt cap 1 according to the present invention, the cap body 2 can be tightened to the bolt B by attaching a non-general purpose tightening tool to the wrench hole 26 and rotating the joint portion 21. Similarly, the cap body 2 can be removed from the bolt B by rotating the non-general purpose tightening tool attached to the wrench hole 26 in the direction opposite to the tightening direction.

Further, since the sleeve 3 can idle with respect to the joint portion 21 and the nut N while the nut N is accommodated, even when a person who attempts to steal the object to be fixed grips the sleeve 3 with a wrench or the like. It is possible to prevent the joint portion 21 from rotating together with the sleeve 3, and a person who attempts to steal the object to be fixed cannot loosen the nut N with a wrench or the like.

Further, since the outer peripheral surface 24 of the head 22 is formed in a tapered shape that gradually reduces the diameter along the axial direction D of the cap body 2, a person who attempts to steal the fixed object wrench the head 22. Since it cannot be gripped due to such factors, the cap body 2 screwed to the bolt B is prevented from being unintentionally loosened.

Further, the outer diameter of the sleeve 3 is set to be substantially the same as or slightly larger than the outer diameter of the head 22, so that a person who attempts to steal the object to be fixed has a slight flat surface (omitted) on the periphery of the head 22. Even if an attempt is made to loosen the anti-theft bolt cap 1 by grasping (1 mm thick) with a wrench or the like, the sleeve 3 interferes with the wrench or the like, so that the head 22 is suppressed from being gripped with the wrench.

As a result, it is possible to suppress the theft of the object to be fixed fixed to the bolt B while ensuring the workability of the anti-theft bolt cap 1.

In the present embodiment, the pentagonal wrench hole 26 has been described as an example, but the shape of the wrench hole 26 is a shape corresponding to an easily available general-purpose tightening tool (for example, a hexagonal bar wrench). It does not have to be, and may be, for example, an octagon.

Further, although the shape of the outer peripheral surface 24 having a tapered diameter has been described as an example, the outer peripheral surface 24 may have a shape that cannot be rotated by gripping with a wrench or the like, for example, so as to bulge outward. It may be a curved surface or the like formed on the surface.

Further, the sleeve 3 is not limited to the one formed in a substantially cylindrical shape as described above as long as it is configured to be idling with respect to the joint portion 21.

Further, the cap body 2 may be any as long as it suppresses corrosion of the bolt B by contact with dissimilar metals, and may be, for example, brass, which is a base metal having a higher ionization tendency than iron.

It should be noted that the present invention can be modified in various ways as long as it does not deviate from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

1 ・ ・ ・ Anti-theft bolt cap 2 ・ ・ ・ Cap body 21 ・ ・ ・ Joint part 22 ・ ・ ・ Head 23 ・ ・ ・ Bolt hole 24 ・ ・ ・ Outer surface 25 ・ ・ ・ Tip surface 26 ・ ・ ・ Wrench Hole 3 ・ ・ ・ Sleeve B ・ ・ ・ Bolt D ・ ・ ・ Axial direction N ・ ・ ・ Nut

Claims (6)

An anti-theft bolt cap that can be attached to the bolt that fixes the object to be fixed.
A cap body having a substantially cylindrical joint portion having a bolt hole that can be screwed into the tip of the bolt, and a head provided at the tip of the joint portion.
A sleeve that is externally inserted into the joint portion so that it can idle with respect to the joint portion,
With
The outer peripheral surface of the head is formed by gradually reducing the diameter along the axial direction of the cap body.
A wrench hole corresponding to a non-general purpose tightening tool is formed at the tip of the head.
The sleeve is an anti-theft bolt cap comprising a nut fastened to the bolt. The anti-theft bolt cap according to claim 1, wherein the outer peripheral surface of the head is formed in a tapered shape or a curved surface shape that gradually reduces the diameter along the axial direction of the cap body. The anti-theft bolt cap according to claim 1, wherein the outer peripheral surface of the head is formed in a curved surface shape whose diameter is gradually reduced along the axial direction of the cap body. The anti-theft bolt cap according to any one of claims 1 to 3, wherein the cap body is made of a metal having a higher ionization tendency than the bolt. The anti-theft bolt cap according to claim 4, wherein the cap body is made of zinc. The anti-theft bolt cap according to claim 4, wherein the cap body is made of brass.

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