JP3194633U - bolt - Google Patents

Abstract

Provided is a bolt having an anti-theft function, which is not loosened even when used in a place with a large temperature difference or a place with a strong vibration. A bolt body includes a bolt body, a nut, a diameter-expansion member, and a sub bolt. The bolt body includes a head portion and a shaft portion extending from the head portion. A locking projection 13 is formed which becomes a locking portion in the direction of tightening the bolt to the part and does not become a locking portion in the loosening direction, and the end portion of the shaft portion has a truncated cone shape which is widened toward the end of the end portion. And a shaft hole that engages with the sub-bolt is formed in the extension line of the space, the nut has a truncated cone shape, and the tip portion becomes a locking portion in the direction of tightening the bolt, and the force in the loosening direction A locking protrusion 22 that does not become a locking portion is formed, the diameter-expanding member is disposed in the space of the bolt body, has a truncated cone-shaped side surface that abuts against the inner wall of the space and expands the space, Screwed into a shaft hole provided in the bolt body, and the bolt body frustum Applying a force that expanded the Jo space. [Selection] Figure 1

Description

  The present invention relates to an improvement of a bolt having both a locking function and an antitheft function.

Between the male threaded part of the bolt and the female threaded part of the nut that is screwed to the male threaded part, it is screwed via a spiral thread / groove provided in both threaded parts, and friction acting between the surfaces of the spiral thread / groove The mutual rotation is stopped by the force, and the fixing relationship is maintained. However, the frictional force generated between the helical thread of the male screw and the spiral groove of the female screw is only generated on a smooth gradient surface. As a result, the fixing condition between the male and female screw parts was broken, and the bolts and nuts were loosened, causing an accident.
Accordingly, the present applicant has proposed a bolt having a locking function for preventing this type of accident. (See Patent Document 1)

  In addition, the conventional bolt has, for example, a hexagonal shape on the side surface of the bolt head, so that the bolt can be easily removed after the object to be fastened is tightened, and the connection of the object to be fastened is easily removed. As a result, the object to be fastened could be subject to theft.

JP2012-127494A

  In addition to improving the previously proposed locking bolts, the present invention is equipped with an anti-theft mechanism, can be securely locked with a simple structure, and has a wide anti-locking bolt function and anti-theft function that can be applied in a wide range of construction. To provide bolts.

The bolt according to the present invention is a bolt including a bolt body, a nut screwed into the bolt body, a diameter-expanding member, and a sub bolt. The bolt body includes a shaft portion, and at least one of the shaft portions. A shaft hole is formed at the end, a frustoconical space that is wider as the end of the shaft hole is closer to the tip, and a shaft hole that is screwed into the auxiliary bolt is formed in an extension line of the space. The nut is formed in the shape of a truncated cone, and a locking projection is formed at the tip of the bolt, which becomes a locking portion for the force in the direction of tightening the bolt and does not become a locking portion for the force in the direction of loosening the bolt.
The diameter-expanding member is disposed in the space of the bolt body, has a frustoconical side surface that abuts against the inner wall of the space and expands the space, and the auxiliary bolt is formed in a shaft hole provided in the bolt body. A bolt that is screwed and moves the diameter-expanding member in a direction of expanding the space of the bolt body to apply a diameter expansion force to the space of the bolt body.

The bolt of the present invention is a bolt composed of a bolt body, a diameter expanding member, and a sub bolt,
The bolt body includes a head portion and a shaft portion extending from the head portion, a shaft hole is formed in at least one end portion of the shaft portion, and a frustoconical space that is widened as the end portion of the shaft hole is closer to the tip end. A shaft hole that is screwed with the sub bolt is formed in an extension line of the space, the head is formed in a truncated cone shape, and a locking portion is provided at the tip of the bolt to tighten the bolt to loosen the bolt. A locking projection that does not become a locking portion is formed in the direction, and the diameter-enlarging member is disposed in the space of the bolt body, and has a truncated cone shape that abuts against the inner wall of the space and expands the space. The auxiliary bolt is screwed into a shaft hole provided in the bolt body, and the diameter-expanding member is moved in the direction of expanding the space of the bolt body to increase the expansion force in the space of the bolt body. It is a bolt characterized by giving.

  The bolt of the present invention is a bolt composed of a bolt body, a nut that is screwed to the bolt body, a diameter-expanding member, and a secondary bolt, and the bolt body is composed of a head portion and a shaft portion that extends from the head portion. A shaft hole in at least one end of the shaft, a frustoconical space widened so that the end of the shaft hole is closer to the tip, and a shaft threadedly engaged with the sub bolt in an extension line of the space A hole is formed, the head is formed in a truncated cone shape, and a locking projection is formed at the tip of the head, which is a locking portion in the direction of tightening the bolt and not a locking portion in the direction of loosening the bolt. The nut is formed in the shape of a truncated cone, and a locking projection is formed at the tip of the nut, which becomes a locking portion for the force in the direction of tightening the bolt and does not become the locking portion for the force in the direction of loosening the bolt. The diameter-expanding member is disposed in the space of the bolt body, and The auxiliary bolt has a frustum-shaped side surface that abuts against the inner wall between them and expands the space. The auxiliary bolt is screwed into a shaft hole provided in the bolt body, and the diameter-expanding member expands the space of the bolt body. It is a bolt characterized by moving in a direction and applying a diameter expansion force to the space of the bolt body.

  Preferably, one or more slits are formed at the end of the shaft portion where the frustoconical space is formed, the slits have the same slit width from the tip to a predetermined length, and It is more preferable that the width of the base portion (terminal portion) of the slit is formed to be wider than the slit width.

  The diameter-expanding member is preferably provided with a slit. The slits may be provided with the same slit width over a predetermined length, or with the same slit width from the notch tip to a predetermined length, and the width of the base (terminal portion) of the slit is the slit width. You may form in a wider shape.

In the bolt of the present invention, after tightening the male threaded portion of the bolt to the female threaded portion of the nut or the female threaded portion of the object to be fastened, the rear end space of the bolt body is pushed out by the diameter-expanding member. Even if expansion and contraction, vibration, etc. are applied to the male and female screw parts over a long period of time, slippage between the slope surfaces does not occur, and the fixing condition between the male and female screw parts is not broken, and the fastened object It has an excellent effect that the connection between them does not loosen.
In the present invention, the head of the bolt body and / or the nut has a truncated cone shape, and a locking projection that is a locking portion in the direction of tightening the bolt and a locking protrusion that does not become a locking portion in the direction of loosening the bolt. As a result, the bolt can be tightened, but the bolt cannot be loosened, and the bolt that has been tightened at one end cannot be easily removed.

  It is the perspective view seen from the nut side of the bolt which shows one embodiment of the present invention.   It is the perspective view seen from the volt | bolt main body head side of the volt | bolt which shows one Embodiment of this invention.   (A) is explanatory drawing which shows 1st Embodiment of this invention volt | bolt, (b) is decomposition | disassembly explanatory drawing.   It is explanatory drawing which shows 2nd Embodiment of this invention bolt.   It is explanatory drawing which shows 3rd Embodiment of this invention bolt.

一実施形態のボルトをボルト本体頭部側から見た斜視図である。
図１、２に示す本考案のボルト１はボルト本体１０とナット２０とからなっている。
ボルト本体１０は頭部１１と軸部１２とからなり、頭部１１は図に示すように円錐台形状に形成され、その先端部分にはボルト２０を締付ける方向には係止部となりボルト２０を緩める方向には係止部とならない係止突部１３が形成されている。
軸部１２には螺線条が刻設されている。
ナット２０は前記ボルト軸部１２に螺合し、外形は円錐台形状に形成され、その先端部分にはナット２０を締付ける方向の力には係止部となりボルト（ナット）を緩める方向の力には係止部とならない係止突起２２が形成されている。
なお図中１６はボルト軸部に設けたスリット、３０は拡径部材、４０は副ボルトであり、これらの詳細は後述する。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

It is the perspective view which looked at the bolt of one embodiment from the bolt main part head side.
1 and 2 is composed of a bolt body 10 and a nut 20.
The bolt body 10 includes a head portion 11 and a shaft portion 12, and the head portion 11 is formed in a truncated cone shape as shown in the figure. A locking protrusion 13 that does not become a locking portion is formed in the loosening direction.
The shaft portion 12 is engraved with a spiral strip.
The nut 20 is screwed into the bolt shaft portion 12 and the outer shape is formed in a truncated cone shape. At the tip portion, the force in the direction of tightening the nut 20 becomes a locking portion, and the force in the direction of loosening the bolt (nut). A locking projection 22 that does not become a locking portion is formed.
In the figure, 16 is a slit provided in the bolt shaft portion, 30 is a diameter-expanding member, and 40 is a sub-bolt, the details of which will be described later.

FIG. 3 is a view for explaining the mechanism of the bolt of the present invention while showing the first embodiment of the bolt of the present invention.
[First Embodiment]
The bolt 1 of the present embodiment is composed of a bolt body 10, a nut 20, a diameter-expanding member (so-called top) 30, and a sub bolt 40, and a specification for fastening an object 51 to be fastened by the bolt body 10 and the nut 20. It is an excellent bolt.
FIG. 3A shows a state in which the fastened object 51 is fastened by the bolt body 10 and the nut 20, and FIG. 3B shows each part before assembly.

円形の切り込みとすることがより好適である。スリットを設けることで端部をより拡径し易くする効果がある。
前記頭部１１は前述したように円錐台形状に形成され、その先端部分にはボルト本体１０を締付ける方向には係止部となりボルト本体１１を緩める方向には係止部とならない係止突起１３が形成されている。図では該突起１３を左右に直線状に２突起設けているが、ボルト本体１０の大きさや締付け力を考慮して３突起〜８突起とすることも可能である。 The bolt body will be described.
The bolt body 10 includes a bolt head 11 and a bolt shaft 12 as shown in FIG.
As shown in FIG. 3 (b), the shaft portion 12 has a truncated cone-shaped space 14 that is widened toward the end of the shaft portion, and a shaft that is screwed into the extension line of the space 14 with the sub bolt 40. A hole 15 is formed.
It is preferable to provide a plurality of slits 16 at the end of the bolt shaft 12 where the space 14 is provided. Although two slits are provided in FIG. 3A, the number is preferably about 2 to 8.

It is more preferable to use a circular cut. By providing the slit, there is an effect of facilitating the diameter expansion of the end portion.
As described above, the head portion 11 is formed in a truncated cone shape, and a locking projection 13 is formed at the tip portion of the head portion 11 in the direction of tightening the bolt body 10 and not in the direction of loosening the bolt body 11. Is formed. In the drawing, the protrusions 13 are provided in two straight lines on the left and right sides. However, considering the size of the bolt body 10 and the tightening force, the protrusions 13 may be 3 to 8 protrusions.

  As shown in FIG. 3, the nut 20 is screwed into the bolt shaft portion 12, and the outer shape is formed in a truncated cone shape. A locking protrusion 22 that does not become a locking portion is formed by this force (see FIG. 1). In the figure, two protrusions 22 are provided in a straight line on the left and right, but it is also possible to have three to eight protrusions in consideration of the size of the nut and the tightening force.

As shown in FIG. 3B, the diameter-expanding member 30 is disposed in the truncated cone-shaped space 14 of the bolt body, and has a truncated cone shape that abuts against the inner wall of the space 14 and applies a diameter-expanding force to the space 14. It has a side.
In the present embodiment, a concave portion 31 for accommodating the head 41 of the sub bolt 40 is provided at the end portion in the large diameter direction of the diameter expanding member 30 as shown in the figure. You may provide a slit in a diameter-expanding member. The slits may be provided with the same slit width over a predetermined length, or with the same slit width over the predetermined length from the leading end of the cut, and the width of the base portion (terminal portion) of the slit is larger than the slit width. You may form in a wide shape. By providing the slit, there is an effect that the diameter-expanding member can be easily expanded.
The auxiliary bolt 40 is screwed into a shaft hole 15 provided in the bolt body, and the diameter-expanding member 30 is moved in the direction of expanding the frustoconical space 14 of the bolt body to expand the diameter in the space 14 of the bolt body. Giving power.
A polygonal (hexagonal in FIG. 3A) recess 42 is provided on the upper surface of the head 41 of the sub bolt 40 to facilitate screwing the sub bolt 40 into the shaft hole 15 of the bolt body. In addition, the screw of the sub bolt may be made into a polygonal outer periphery of the head 41, or may be provided with a minus or plus groove into which a minus or plus screwdriver can be inserted to facilitate screwing. The part may have any shape as long as the sub bolt 40 can be rotated.
The head 41 is configured to be stored in a storage recess 31 provided in the diameter-expanding member 30 as illustrated, and after the head 41 is stored in the storage recess 31, the recess is covered with a cap 60 (not shown). When closed, the secondary bolt 40 is not exposed, and the effect of preventing theft can be further increased, which is effective.

The assembly (use) method will be described.
First, the shaft portion 12 of the bolt main body is attached to the through-hole of the fastened object 51, the nut 20 is screwed to the tip of the bolt shaft portion, and the nut or the bolt main body is tightened.
Since the head of the bolt body or the nut is formed with locking projections 13 and 22 which are locking portions in the direction of tightening the bolts or nuts and which are not locking portions in the direction of loosening the bolts. By tightening the bolt 1 by applying a tool to the protrusion, the fastened objects 51 can be fixed to each other. On the other hand, once tightened, the head and nut of the bolt body do not have a locking projection that rotates in the direction of removing the bolt, and the bolt head and nut are formed in a truncated cone shape. The tool cannot be locked and the bolt cannot be removed. In this way, the bolt can be tightened but cannot be loosened, so that theft can be prevented in advance.

Next, the diameter expanding member 30 is mounted in the shaft space 14 of the bolt body, the shaft portion 43 of the sub bolt is passed through the through hole of the diameter expanding member 30, and the shaft portion 43 of the sub bolt is inserted into the shaft hole of the bolt body 10. 15, the diameter expanding member 30 advances in the truncated cone-shaped space 14, and the diameter expanding member 30 is gradually expanded in diameter by tightening the diameter expanding member 30, so that a screwed portion between the bolt body 10 and the nut 20 is formed. Adhere firmly.
By screwing the expanded member into the space of the bolt body, even if expansion and contraction, vibration, etc. are applied to the bolt body and the male and female screw parts over a long period of time, there will be no sliding between the threaded slope surfaces, and the male and female screw parts The fixing condition between them is not broken, and the connection between the objects to be fastened is not loosened. Thus, the bolt of the present invention has a feature excellent in the locking effect.
Further, by housing the head of the auxiliary bolt in the concave portion 13 provided in the diameter-expanding member, the auxiliary bolt becomes difficult to see from the outside, and the portion where the auxiliary bolt is rotated is covered with a cap or the like (not shown). The anti-theft effect can be expected even more.

[Second Embodiment]
FIG. 4 is a second embodiment of the present invention and shows a bolt 1 that is mainly excellent in application as an anchor bolt. A bolt main body 10, a nut 20, a diameter-expanding member (so-called top) 30, and a sub bolt 40. Where the configuration is the same as that of the first embodiment, the same reference numerals are assigned and detailed description is omitted.

The bolt body will be described.
As shown in FIG. 4, the bolt body 10 includes only a bolt shaft portion 12. At least one end portion of the shaft portion 12 of the bolt body is provided with a shaft hole 15 as described with reference to FIG. 3B, and the end portion of the shaft hole 15 is widened toward the tip. A trapezoidal space 14 and a shaft hole 15 screwed into the sub bolt 40 are formed in an extension line of the space 14. If necessary, a slit 16 is provided at the end.
The nut 20 is formed in a truncated cone shape and is screwed into the bolt shaft portion 12. A locking projection 22 is formed at the tip of the nut 20 as a locking portion for the force in the direction of tightening the nut 20 and not as a locking portion for the force in the direction of loosening the nut 20 (see FIG. 1).

As described with reference to FIG. 3B, the diameter-expanding member 30 is disposed in the frustoconical space 14 of the bolt shaft portion 12 and abuts against the inner wall of the space 14 to apply a diameter-expanding force to the space. A through hole 32 having a truncated cone side surface and penetrating the shaft portion 43 of the sub bolt 40 is provided.
As described with reference to FIG. 3B, the auxiliary bolt 40 includes a bolt head portion 41 and a shaft portion 43, and the shaft portion 43 is screwed into a shaft hole 15 provided in the bolt body shaft portion 12. The diameter-expanding member 30 is moved in the direction in which the diameter of the truncated cone-shaped space 14 of the bolt body is increased, and a diameter expansion force is applied to the bolt body shaft space 14.

The assembly (use) method will be described.
First, the bolt body shaft portion 12 is embedded in a structure 52 such as concrete so that a space 14 portion provided in the shaft portion 12 protrudes. Next, the through hole of the fastened object 51 connected to the building 52 is passed through the bolt shaft portion 12, and the nut 20 is tightened to attach both. Next, the diameter expanding member 30 is mounted in the shaft space 14 of the bolt body, the shaft portion 43 of the sub bolt 40 is passed through the through hole 32 of the diameter expanding member 30, and the shaft portion 43 of the sub bolt is connected to the bolt body shaft portion. The diameter-expanding member 30 advances while expanding the frustoconical space 14 by being screwed into the shaft hole 15, and the screwed portion between the bolt body 10 and the nut 20 is firmly adhered by tightening the diameter-expanding member 30. As a result, the nut 20 does not come off the bolt body 10.
Thus, the bolt of this embodiment also has a locking effect and a theft prevention effect.

[Third Embodiment]
FIG. 5 shows a third embodiment of the present invention, which shows a bolt 1 with excellent specifications for fastening an object to be fastened 51 with a bolt body 10. Detailed description is omitted.

The bolt body will be described.
The bolt according to the present embodiment includes a bolt body 10, a diameter-expanding member (so-called top) 30, and a sub bolt 40.
The bolt body 10 includes a head portion 11 and a shaft portion 12 extending from the head portion 11. An end portion of the shaft portion 12 has a shaft hole 15, and the end portion of the shaft hole 15 is wider as the end portion is closer to the tip. A frustoconical space 14 and a shaft hole 15 to be screwed with the sub bolt 40 are formed in an extension line of the space 14, the head 11 is formed in a frustoconical shape, and a bolt is tightened at a tip portion thereof. Is formed with a locking projection 13 which does not become a locking portion in the direction of loosening the bolt.
The diameter-expanding member 30 is disposed in the space 14 of the bolt body, and has a frustoconical side surface that abuts against the inner wall of the space 14 and applies a diameter expansion force to the space.
The sub bolt 40 is screwed into the shaft hole 15 provided in the bolt body 10, and the diameter expanding member 30 is moved in the direction of expanding the space 14 of the bolt body so as to apply a diameter expanding force to the space of the bolt body 10. Give.

The assembly (use) method will be described.
In the present embodiment, a spiral groove 53 is formed on at least one of the fastened objects 51.
First, the bolt body shaft portion 12 is screwed into the thread groove 53 of the article 51 to be fastened. At this time, the bolt body 12 is screwed so that the tip of the shaft portion 12 is slightly parallel to the surface of the article 51 to be fastened. Next, the diameter expanding member 30 is mounted in the shaft space 14 of the bolt body, the shaft portion 43 of the sub bolt is passed through the through hole of the diameter expanding member 30, and the shaft portion 43 of the sub bolt is connected to the shaft of the bolt body shaft portion. By screwing into the hole 15, the diameter expanding member 30 advances while expanding the frustoconical space 14, and by pushing the expansion member 30, the screwed portion between the bolt body 10 and the thread groove 53 of the object to be fastened is strengthened. The bolt main body 10 is not detached from the fastened object 51.
Thus, the bolt 1 of this embodiment also has a loosening prevention effect and a theft prevention effect.

  The bolts of the present invention reliably function to prevent loosening when used in locations with a large temperature difference or in locations with strong vibrations, and can only rotate in the direction in which the bolt body 10 or nut 20 is tightened. Because it has a structure that can be used, it has an anti-theft effect, a wide construction range, excellent anti-loosening, anti-theft bolt.

DESCRIPTION OF SYMBOLS 1 Bolt 10 Bolt main body 11 Head part of bolt main body 12 Shaft part of bolt main body 13 Locking protrusion of bolt main body 14 Frustum-shaped space 15 Shaft hole 20 Nut 22 Nut locking protrusion 30 Expanding member 40 Sub bolt 41 Sub bolt Head part 43 Auxiliary bolt shaft part 51 Fastened object

Claims (5)

It is a bolt composed of a bolt body, a nut screwed into the bolt body, a diameter-expanding member, and a sub bolt,
The bolt body includes a shaft portion, a shaft hole is formed at least at one end of the shaft portion, and a truncated cone-shaped space that is widened toward the end tip of the shaft hole so as to be closer to the end tip. , A shaft hole screwed with the sub bolt is formed in an extension line of the space,
The nut is formed in the shape of a truncated cone, and a locking projection that is a locking portion for a force in the direction of tightening the bolt and a locking portion that is not a locking portion for a force in the direction of loosening the bolt is formed at the tip of the nut.
The diameter-expanding member is disposed in the space of the bolt body, and has a truncated cone-shaped side surface that abuts against the inner wall of the space and expands the space.
The secondary bolt is screwed into a shaft hole provided in the bolt body, and the diameter-expanding member is moved in a direction in which the diameter of the truncated cone-shaped space of the bolt body is increased to give a diameter expansion force to the space of the bolt body. Bolt characterized by that. It is a bolt consisting of a bolt body, a diameter-expanding member, and a sub bolt,
The bolt body includes a head and a shaft extending from the head, and the head is formed in a truncated cone shape. A locking protrusion that does not become a locking portion is formed, and a shaft hole is formed at the tip of the shaft portion, and the frustoconical space is widened toward the tip of the end, and an extension line of the space. A shaft hole to be screwed with the sub bolt is formed,
The diameter-expanding member is disposed in the space of the bolt body, and has a truncated cone-shaped side surface that abuts against the inner wall of the space and expands the diameter of the truncated-conical space,
The secondary bolt is screwed into a shaft hole provided in the bolt body, and the diameter-expanding member is moved in a direction in which the diameter of the truncated cone-shaped space of the bolt body is increased to give a diameter expansion force to the space of the bolt body. Bolt characterized by that. A bolt body, a bolt made of a nut, a diameter-expanding member, and a sub-bolt screwed into the bolt body,
The bolt body is composed of a head and a shaft extending from the head, and the head is formed in a truncated cone shape. The tip of the head is a locking portion in the direction in which the bolt is tightened, and is in the direction in which the bolt is loosened. A locking projection that does not become a stop is formed, and a shaft hole is formed at the tip of the shaft, and the frustoconical space is widened toward the tip of the end. A shaft hole to be screwed with the sub bolt is formed,
The nut is formed in the shape of a truncated cone, and a locking projection that is a locking portion for a force in the direction of tightening the bolt and a locking portion that is not a locking portion for a force in the direction of loosening the bolt is formed at the tip of the nut.
The diameter-expanding member is disposed in the space of the bolt body, and has a truncated cone-shaped side surface that abuts against the inner wall of the space and expands the space.
The sub bolt is screwed into a shaft hole provided in the bolt body, and the diameter expanding member is moved in a direction of expanding the space of the bolt body to apply a diameter expanding force to the space of the bolt body. Bolt to be.   The bolt according to any one of claims 1 to 3, wherein one to a plurality of slits are formed at an end portion of the shaft portion in which the frustoconical space is formed.   One or more slits are formed at the end of the shaft portion where the truncated cone space is formed, and the slit has the same slit width from the tip of the shaft portion to a predetermined length, and The bolt according to any one of claims 1 to 3, wherein a width of a base portion (terminal portion) of the slit is formed to be wider than the slit width.

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