JP2003343535A - Double turning preventive cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double turning preventive cap by which either of a bolt or a nut can be fixed in a countersink hole, even when tolls such as a wrench cannot be used in fastening of a bolt and nut. <P>SOLUTION: The double turning preventive cap 10 is provided with approximately cylindrical cap body 11 inserted and mounted on a head part (hex head part 51) of the nut or bolt, and a plurality of claw pieces 12 protruded to a side of the cap body 11. The claw piece 12 is fitted in the countersink hole and elastically stretched in the inside of the countersink hole, thereby being latched and fixed on the inner peripheral surface of the countersink hole so as to prevent double turning. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a co-rotation preventing cap that is attached to either a nut or a bolt to prevent co-rotation when fastening a bolt and a nut.

[0002]

2. Description of the Related Art Various kinds of connecting hardware and bolts and nuts are frequently used for joining structural members made of wood. The general form of such a joining structure is to fix a connecting metal article having a plate-shaped or tenon-pipe-shaped connecting portion to one member or a foundation, and to the other member a slit or mortise corresponding to the connecting portion. Formed, insert the connecting part of the connecting metal object into the slit or mortise, insert the bolt so as to penetrate the connecting part from the side surface of the other member, and fasten it with the nut arranged on the opposite side surface It is a thing. In such a joint form, usually, a counterbore hole is formed in a side surface of a member to which the bolt and nut are fastened, and the head of the bolt or nut is sunk in the counterbore hole.

[0003]

As described above, in the mode in which the members are joined to each other through the connecting metal object and the bolts and nuts, at the same time as turning the bolts from the side of the members using a tightening tool such as an impact wrench, Press the nut from the opposite side with a tool such as a wrench to prevent co-rotation of the nut. Therefore, a space for using tools is required on both sides of the member.

However, for example, in the portion as shown in FIG. 4, when the connecting hardware 2 fixed to the foundation 1 and the pillar 3 are joined, the base 4 preliminarily attached to the foundation 1 is fixed to the bolt hole formed in the pillar 3. The nut 5 side of 7 is blocked. Therefore, it is not possible to secure a space for holding the nut 5 with a wrench or the like, and when the bolt 6 is turned, the nut 5 co-rotates. So in such a fit,
There is a constraint on the construction procedure such that the pillar 3 is erected before the foundation 4 is attached to the foundation 1, and such construction procedure must be taken into consideration also in the design of the final product and the member development.

Therefore, the present invention solves the problem of providing a co-rotation preventing cap capable of fixing either one of a bolt and a nut in a counterbore even if a tool cannot be used as shown in the drawing. And

[0006]

In order to solve the above-mentioned problems, a co-rotation preventing cap of the present invention comprises a substantially cylindrical cap body to be inserted into the head of a nut or a bolt, and a lateral side of the cap body. A plurality of claw pieces projecting to the inside, the claw pieces being fitted into a counterbore hole formed for attaching the nut or bolt, and elastically hooked to the inner peripheral surface of the counterbore hole. It is characterized in that it is formed as follows.

This co-rotation preventing cap is for fixing either one of the bolt and the nut in the counterbore hole, and is inserted on the nut side when the nut is pressed to rotate the bolt. When the co-rotation prevention cap is inserted in the nut and is inserted into the counterbore with the nut, the tab protruding laterally of the cap body is caught on the inner peripheral surface of the counterbore to restrict rotation of the nut. . Therefore, both can be fastened simply by turning the bolt without pressing the nut with a wrench or the like. On the contrary, when fixing the bolt and turning the nut, the co-rotation preventing cap is inserted into the head of the bolt.

When the heads of bolts and nuts have the most general hexagonal shape, the cap body is also formed in a hexagonal tube shape. Then, the co-rotation preventing cap is stabilized in the counterbore hole by projecting the claw pieces from the three side surfaces that are not adjacent to each other among the six side surfaces of the cap main body, and the shaft center of the cap is formed in the counterbore hole. It is possible to accurately match the shaft center.

Further, when the co-rotation preventing cap is used for a flanged nut, a stabilizing piece that projects laterally from the bottom edge of the cap body is provided, and this stabilizing piece is provided on the flange surface of the flanged nut. It is preferable to form it along. According to this configuration, even if there is some play between the cap body and the flanged nut, it becomes easy to prevent the axis of the cap body from tilting with respect to the axis of the flanged nut.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a co-rotation preventing cap 10 of the present invention formed for a hexagon nut or hexagon bolt.
And the usage state when the co-rotation prevention cap 10 is inserted into a general flanged hexagon nut 50.

The co-rotation preventing cap 10 is formed by bending a thin steel plate having a thickness of, for example, about 1 mm, and is a head of a hexagon nut or a hexagon bolt (hereinafter, these are referred to as "hexagon portion 51"). The cap body 11 has a hexagonal tubular shape, and three claw pieces 12 projecting laterally from the cap body 11.

The inner size of the cap body 11 is formed to be substantially equal to the outer size of the hexagonal portion 51. There may be some play between the inner dimension of the cap body 11 and the hexagonal portion 51, but the inner dimension of the cap body 11 should be the same as or slightly smaller than the outer dimension of the hexagonal portion 51. When the cutout 13 provided on the side surface of the cap body 11 is pushed open and fitted into the hexagonal portion 51, the cap body 1
It is possible to accurately match the shaft centers of 1 and the hexagonal portion 51. The height of the cap body 11 is not particularly limited as long as it is within a range in which the cap body 11 can be stably inserted into the hexagonal portion 51.
It is practical that the size is the same as or slightly smaller than the depth of the counterbore 70 (see FIG. 4) formed in wood or the like.

In the illustrated embodiment, the claw pieces 12 are not adjacent to each other among the six side surfaces forming the cap body 11.
They are arranged so as to project from the side surfaces of the respective places and to form a central angle of 120 degrees with respect to the axis of the cap body 11. Each claw piece 12 is formed by bending a strip-shaped portion extending from a thin steel plate forming the cap body 11 back outward, and the tip end portion thereof is bent toward the cap body 11 side. . The claw pieces 12 can be slightly deformed by the spring elasticity of the thin steel plate itself, and the diameter of the circumscribed circle of the three claw pieces 12 is the counterbore 70 (see FIG. 2) formed in wood or the like. It is formed to be slightly larger than the diameter of the circle indicated by the chain double-dashed line).

Further, on the bottom edge of the cap body 11, there are provided stabilizing pieces 14 projecting laterally at three positions. These stabilizing pieces 14 are respectively arranged on the side surfaces where the claw pieces 12 are not provided among the six side surfaces forming the cap body 11. Each stabilizing piece 14 is slightly inclined and protrudes along the flange surface 52 of the flanged hexagon nut 50, and the cap body 11 inserted in the hexagonal portion 51 has the hexagonal portion 51 of the flanged hexagon nut 50.
It acts to prevent tilting.

When the co-rotation preventing cap 10 having such a structure is inserted into a nut and pushed into a counterbore hole 70 formed in wood or the like, the claw piece 12 protruding laterally of the cap body 11 is elastic. While deforming, the inner peripheral surface of the spot facing hole 70 is pressed outward and stretched. As is apparent from FIG. 2, since the three claw pieces 12 are provided at equal intervals, the axis of the nut and the cap body 11 is in good agreement with the axis of the counterbore 70. Further, since the side edge of the claw piece 12 is just caught by the inner peripheral surface of the counterbore hole 70, the rotation in the counterbore hole 70 is very effectively restrained even though the structure is simple. be able to.

Therefore, even in the portion shown in FIG. 4, for example, if the co-rotation preventing cap 10 is inserted into the nut 5 and pushed into the counterbore hole 70 of the pillar 3 in advance, the nut is wrenched. Even if 5 is not pressed, only the bolt 6 can be turned and fastened. Also, the nut 5 is prevented from falling out of the counterbore hole 70. When fixing the bolt 6 side and turning the nut 5, the co-rotation preventing cap 10 is inserted into the head of the bolt 6.

In the illustrated embodiment, the cap body 11 is also formed in a hexagonal tubular shape on the assumption that it is used for a hexagonal bolt / nut, but the shape of the cap body 11 is naturally used. It can be changed appropriately according to the shape of the head of the bolt / nut.

[0019]

The co-rotation prevention cap of the present invention is bolted to
By inserting the nut into one of the nuts and fitting the nut into the counterbore, it is possible to prevent the one bolt or the nut from rotating together during screwing. As a result, it is possible to reliably and efficiently perform the bolt / nut fastening operation even in a portion where tools such as a wrench are difficult to use.

Since the bolts and nuts can be partially tightened at the fastening parts, it is not necessary to consider the fitting considering the space for using the tools, and the flexibility of the fitting and the member design is increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing a co-rotation preventing cap according to an embodiment of the present invention and a usage example thereof.

FIG. 2 is a top view showing a state where the co-rotation preventing cap is inserted into a hexagon nut with a flange.

FIG. 3 is a perspective view showing a state where the co-rotation preventing cap is inserted into a hexagon nut with a flange.

FIG. 4 is a perspective view showing an example of a joining form of members made of wood.

[Explanation of symbols]

10 Co-rotation prevention cap 11 Cap body 12 nail pieces 14 Stabilizer 5 nuts 50 nut with flange 51 Flange surface 6 bolts 70 counterbore

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Minoru Bando             3-122, Kashiwamura-cho, Yao-shi, Osaka Prefecture             Inside the stud company

Claims (3)

[Claims] 1. A cap body that is inserted into the head of a nut or bolt and has a substantially tubular cap body, and a plurality of claw pieces that project laterally from the cap body, the claw pieces being the nut or bolt. A co-rotation preventive cap, characterized in that it is fitted into a counterbore formed for attaching a cover, and is elastically hooked to the inner peripheral surface of the counterbore. 2. The cap body is formed in a hexagonal tube shape, and the claw pieces project from three side surfaces of the cap body which are not adjacent to each other among the six side surfaces of the cap body. Co-rotation prevention cap. 3. The stabilizer according to claim 1, further comprising a stabilizing piece that projects laterally from a bottom edge portion of the cap body, the stabilizing piece being formed along a flange surface of the flanged nut. Co-rotation prevention cap as described.