JP2003202011A - Double turning preventive device of fastener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double turning preventive device of a fastener which fastens the fastener by certainly adhering a seat surface of the fastener to it regardless of deterioration of the fastener, a working site, etc., and other working conditions, and certainly prevents double turning of the fastener even at the time of loosening the fastener. <P>SOLUTION: Double turning of the fastener is prevented because a projected part 22 interferes with a vertical wall part 12A at the time of double turning of a bolt 10 when a nut 20 is rotated by a spanner by forming the projected part 22 on one of the bolt 10 and the nut 20. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a pair of fasteners composed of a shaft portion having a male screw formed therein and a cylindrical body having an inner peripheral surface provided with a female screw capable of being screwed with the male screw. The present invention relates to a co-rotation preventing device for a fastener for preventing the pair of fasteners from co-rotating with a rotating operation for fastening a member to be fastened or loosening the member to be fastened. .

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
For example, a bolt and a nut are used as a fastener for overlapping and fastening two members. In this type of bolt and nut fastening structure, the bolt and nut may rotate together, and tightening may not be possible. Also, when loosening the tightened bolt and nut, it may not be possible to remove them by co-rotating similarly. Various improved techniques for preventing this co-rotation have been proposed.

For example, in Japanese Patent Laid-Open No. 168010/1990 (hereinafter referred to as "prior art 1"), at least two protrusions are provided on the outer peripheral surface of the shaft portion near the seating surface of the bolt, and the protrusions are the members to be fastened. It has been proposed to prevent the bolt from rotating by fitting it into a prepared hole.

[0004] In this prior art 1, although it is good at the time of fastening, there is a possibility that the loosened bolt may continue to be fitted in the prepared hole and may not come off.

Further, Japanese Utility Model Laid-Open No. 61-184117 (hereinafter referred to as prior art 2), Japanese Utility Model Laid-Open No. 2-6813 (hereinafter referred to as prior art 3) and Japanese Patent Laid-Open No. 10-318.
Japanese Laid-Open Patent Publication No. 237 (hereinafter, referred to as Prior Art 4) is provided with a protrusion for contacting a member to be fastened on a seat surface of a bolt or a nut.
It is disclosed that the protrusion is engaged with the member to be fastened to prevent the rotation of either the bolt or the nut.

In the prior arts 2 to 4, the rotation is prevented, but the adhesion between the seat surface and the member to be fastened is impaired,
The area that catches the load is small, which may cause problems in design strength.

In Prior Art 4, it is premised that the member to be fastened is deformed (the member to be fastened is raised by the rotation of the projection and is inserted into the recess provided around the projection). There are scratches left. For this reason, although the contact area can be secured to some extent, when the bolt and the nut are replaced later, the deformed portion obstructs the contact area and the contact area is reduced. Further, there is a problem in that versatility is lacking because deformation is not expected in a hard member in which a member to be fastened is quenched or the like.

As a related technique, Japanese Patent Laid-Open No. 7-269
Japanese Patent No. 544 (referred to as Prior Art 5) has solved a problem that, when tightening bolts and nuts, the bolts and nuts when the bolts and nuts are prevented from rotating strongly bite into the recesses of the crank piece and hinder the unclamping operation. A bolt / nut co-rotation prevention device has been proposed.

The co-rotation preventing device used in the prior art 5 is based on a separate tool and is used only in a limited place such as a part of an automatic line work process, and is applied at a construction site or the like. There is no general purpose.

Further, in the above-mentioned prior arts 1 to 5, the detent at the time of fastening is mainly considered, and the loosening is additionally described.

For this reason, when the bolts and nuts that are already in the tightened state are dirty (due to deterioration over time) due to pain, crushing, rust, painting, etc. of the thread, the first tightened state is After loosening, the co-rotation continues, and in the above-mentioned prior arts 1 to 4, the function is not exerted at all.

That is, tightening can be done by fitting a wrench to one side, but when loosening, fix one side with a wrench, etc.
Conventional work such as turning the other with another wrench is required, and the workability in narrow places or high places where access is difficult is still present.

In consideration of the above facts, the present invention can securely fasten the seating surfaces of the fasteners regardless of the working conditions such as the deterioration of the fasteners with time and the work place, and the fasteners can be loosened. An object of the present invention is to provide a fastener co-rotation prevention device that can surely prevent co-rotation even at a special time.

[0014]

DISCLOSURE OF THE INVENTION The present invention provides a pair of fasteners comprising a shaft portion having a male screw formed therein and a cylindrical body having an inner peripheral surface provided with a female screw capable of being screwed with the male screw. A fastener co-rotation preventing device for preventing the pair of fasteners from co-rotating with a rotating operation for fastening the fastening member or loosening the fastening member. In addition, a projecting portion that is provided on at least one of the pair of fasteners and that projects radially from the peripheral surface of the fastener is provided.

According to the present invention, by providing the protrusions in the radial direction of the fastener, if there is any interfering object on the rotation locus of the protrusion, even if the fasteners rotate together,
Since rotation is blocked within the range of one round, co-rotation thereafter can be prevented.

In this case, since the rotation is blocked by the height of the interfering object, the rotation is blocked even when the fastening portion is loosened,
Even fasteners that have deteriorated over time can be easily removed.

In the present invention, the shaft portion of the pair of fasteners is a hexagon bolt, the tubular body is a hexagon nut, and the protrusion is formed on the peripheral surface of the hexagon bolt or the hexagon nut. It is characterized in that it is formed on a part of six planes.

With a hexagon bolt or a hexagon nut, protrusions can be formed on a part of the six planes formed on the peripheral surface thereof.

Further, in the invention, it is characterized in that the projecting portion is removable.

That is, by attaching / detaching the protrusions as needed, the protrusions can be provided only when loosening the fasteners (bolts / nuts) that are difficult to loosen due to deterioration over time, for example.

Further, a blocking member for blocking the movement of the protrusion is provided on a rotational movement locus of the protrusion about the rotation center of the fastener.

A structural vertical wall or the like can be used as the interference member, but if such a member does not exist, it is necessary to separately provide a blocking member at a position where it interferes with the protruding portion. As a result, the rotation of the protrusion can be prevented.

Further, the blocking member is a bolt or a rivet having a head portion at least with respect to the shaft portion.

As the blocking member, it is preferable to provide a dummy bolt / nut or a rivet (which does not contribute to tightening of the member to be fastened and which does not need to be replaced later).

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) FIGS. 1 and 2 show a hexagonal bolt 10 (hereinafter referred to as a fastener) as a fastener to which the fastener co-rotation preventing device according to the first embodiment is applied. , Simply referred to as bolts 10).

A pair of plate members 12, 14 as members to be fastened
Are in close contact with each other, and the prepared holes 16 and 18 are coaxially arranged.

The bolt 10 is inserted into the prepared holes 16 and 18.
The shaft portion 10A is inserted.

The shaft portion 10 inserted into the prepared holes 16 and 18
A hexagonal nut 20 (hereinafter, simply referred to as nut 20) that constitutes a fastener together with the bolt 10 is screwed into A. When tightening the pair of plate members 12 and 14 using the bolt 10 and the nut 20, a wrench (not shown) is fitted into the mutually facing surfaces of the nut 20 and rotated (usually clockwise with respect to the moving direction). Therefore, the shaft 10
By screwing with A, the plate member 14 on the lower side is gradually approached, and finally, the pair of plate members 12 and 14 can be clamped T with the head 10B of the bolt 10.

Here, a rod-shaped protruding portion 22 protruding in the radial direction is formed on one surface of the hexagonal peripheral surface of the head portion 10B of the bolt 10. In addition, the upper plate material 12,
A vertical wall portion 12A is formed in the vicinity of the prepared hole 16.
The vertical wall portion 12A corresponds to the bolt 1 in the protruding portion 22.
It is arranged on a rotational movement locus centering on the axis of rotation 0. Therefore, when the bolt 10 rotates, the protrusion 22
Interferes with the vertical wall portion 12A, and the rotation of the bolt 10 is blocked by this interference.

That is, when the bolt 10 rotates in the clockwise direction (clockwise direction in FIG. 2), the protruding portion 22 in the broken line state in FIG. Rotation is blocked. In addition, the bolt 10 rotates counterclockwise (Fig. 2
Counterclockwise direction), the state shown by the solid line in FIG. 2 is reached, and rotation thereafter is blocked.

Therefore, even if the nut 20 is rotated by the spanner in either the tightening direction or the loosening direction,
The protrusion 22 of the bolt 10 interferes with the vertical wall portion 12A below the circumference, and its rotation is blocked, so that the bolt 10 is prevented from co-rotating according to the rotation of the nut 20.

The operation of the first embodiment will be described below.

When the pair of plate members 12, 14 are closely fixed, the prepared hole 1 is provided at a predetermined position of each plate member 12, 14.
6 and 18 are provided. The diameters of the pilot holes 16 and 18 are formed according to the sizes of the bolt 10 and the nut 20 to be applied. For example, in the case of the bolt 10 whose shaft portion 10A has a diameter of 6 mm, the prepared holes 16 and 18 of about 8 mm to 10 mm are formed. The diameter of the pilot holes 16 and 18 is the same as the bolt 1
It is smaller than the minimum diameter of the head portion 10B of 0.

Next, the pair of plate members 12 and 14 are put together, and at this time, the prepared holes 16 and 18 are put so as to be coaxial with each other. The shaft portion 10 of the bolt 10 is provided in the prepared holes 16 and 18.
A is inserted, the nut 20 is aligned with the tip of the shaft portion 10A protruding from the lower plate member 14, and the nut 20 is rotated to be screwed. This rotation is performed by rotating with a spanner so that the nut 20 gradually approaches the lower plate member 14 by screwing.

When rotating the nut 20 using this spanner,
If the bolt 10 is free, it may rotate with the rotation of the nut 20 and may not be screwed. However, in the first embodiment, the protrusion 22 provided on the head portion 10B of the bolt 10 has the vertical wall portion 12A formed on the upper plate member 12.
Therefore, the rotation is blocked thereafter. As a result, the nut 20 is smoothly screwed, and the pair of plate members 12 and 14 can be securely tightened.

In the tightened state, the seating surfaces of the bolt 10 and the nut 20 are firmly attached to the plate members 12 and 14,
The fastening strength can be reliably maintained, and the plate member 12,
There is nothing to hurt 14.

On the other hand, when loosening the tightened bolt 10 and nut 20, align a wrench with the nut 20,
Rotate in the opposite direction of tightening. At this time, bolt 1
0 co-rotates from the solid line state in FIG. 2, but since it again interferes with the vertical wall portion 12A at the position of the two-dot chain line in FIG. 2, co-rotation can be prevented even when loosening.

Furthermore, since it is possible to maintain co-rotation prevention by the height of the vertical wall portion 12A, the head portion 10B of the bolt 10 is maintained.
Even if is separated from the plate member 12, it does not rotate together, and the nut 20 can be reliably removed from the shaft portion 10A of the bolt 10. (Second Embodiment) FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the case where the protrusion 22 is provided on the nut 20 side is shown.
In the second embodiment, the head 10 of the bolt 10 is used, whereas the embodiment of FIG.
It is sufficient to put a spanner on B and rotate it.

Further, when the pair of plate members 24 and 26 are near the bent corners as in the second embodiment, the bending is utilized to prevent the protrusion 22 from rotating. can do. (Third Embodiment) FIG. 4 shows a third embodiment of the present invention. In the third embodiment, the protrusion 28 provided on the bolt 10 is attachable to and detachable from the bolt 10. That is, the protrusion 28 has a shaft 28A.
On the other hand, a circular groove 10C is provided on one surface of the bolt 10.

With this structure, the protruding portion 2 can be selectively used in a narrow place where a spanner or the like is difficult to enter, or in a high place where only one hand can be used.
8 is fitted in the circular groove 10C, and the protrusion 28 can prevent co-rotation.

As in the third embodiment, the protrusion 28
By making it detachable, the projecting portion 28 can be provided if necessary, and the length of the projecting portion 28 can be attached to the projecting portion 28 according to the situation of the site. You can increase your sex.

Further, in the third embodiment, the bolt 10 is described as an example, but the projection 28 may be attached to the nut 20 (not shown in FIG. 4).

In the third embodiment, the protruding portion 28 has a round bar shape, but the shape of the protruding portion 28 is not limited. That is, various shapes such as a round bar, a polygonal shape, and a tapered shape can be applied. (Fourth Embodiment) FIG. 5 shows a fourth embodiment of the present invention. In the fourth embodiment, the bolt 10 and the nut 20 (not shown in FIG. 5) are not different from those of the conventional one, and are sandwiched in the head portion 10B of the bolt 10 so that the detachable protrusion 22 is mounted. There is a point. Of course, the protrusion 30 may be provided on the peripheral surface of the nut.

In the first to fourth embodiments, when the bolt 10 and the nut 20 are screwed together, the protrusions 22 (28, 30) interfere with each other while co-rotating. Although the vertical wall portion 12A formed on the plate members 12 and 14 and the bent portions of the bent plate members 24 and 26 are used as a means for preventing the rotation of the plate members 12, 14, as shown in FIG. The bolt 32 may be provided.
The dummy bolt 32 is used for the plate members 12, 14 (or 2
4, 26) need not have any function for tightening, and may be, for example, a rivet or the like.

According to the above-described first to fourth embodiments, by forming the protruding portion 22 on one of the bolt 10 and the nut 20, the nut 20 rotates together with the bolt 10 when the spanner is rotated. At times, the protruding portion 22 interferes with the vertical wall portion 12A, and co-rotation can be prevented.

[0046]

As described above, according to the present invention, the seating surface of the fastener can be securely brought into close contact with the fastener regardless of the working conditions such as the deterioration of the fastener with time and the working place, and the fastener can be loosened. It has an excellent effect that co-rotation can be surely prevented even at a special time.

[Brief description of drawings]

FIG. 1 is a perspective view showing a fastening state of a pair of plate materials by a fastener according to a first embodiment.

FIG. 2 is a plan view showing a rotation preventing state of a protrusion provided on the bolt according to the first embodiment.

FIG. 3 is a perspective view showing a fastening state of a pair of plate materials by a fastener according to a second embodiment.

FIG. 4 is a perspective view showing a state of a removable protrusion according to a third embodiment.

FIG. 5 is a perspective view showing a state of a removable protrusion according to a fourth embodiment.

FIG. 6 is a plan view showing a modified example of the blocking member that blocks the rotation of the protrusion applied to the first to fourth embodiments.

[Explanation of symbols]

10 bolts (fasteners, shafts) 10A shaft 10B head 10C circular groove 12 plate materials 14 plate materials 16 pilot holes 18 prepared hole 20 Nuts (fasteners, cylinders) 22 Projection (first embodiment) 24 plate materials 26 plate materials 28 Projection (Third Embodiment) 30 Projection (Fourth Embodiment) 32 dummy bolt

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masato Miyazaki             1-12-13 Hinaganishi, Yokkaichi-shi, Mie Prefecture Solito             House 203

Claims (5)

[Claims] 1. A fastened member is fastened using a pair of fasteners including a shaft portion formed with a male screw and a cylindrical body having an inner peripheral surface provided with a female screw capable of being screwed with the male screw. To do
Or a fastener co-rotation preventing device for preventing the pair of fasteners from co-rotating with a rotating operation when loosening from the member to be fastened, wherein A co-rotation preventing device for a fastener, comprising: a protrusion provided on at least one of the fasteners and protruding in a radial direction from a peripheral surface of the fastener. 2. The shaft portion of the pair of fasteners is a hexagon bolt, the tubular body is a hexagon nut, and the protrusion is six flat surfaces formed on the peripheral surface of the hexagon bolt or the hexagon nut. The co-rotation preventive device for a fastener according to claim 1, wherein the anti-rotation device is formed on a part of the. 3. The co-rotation preventing device for a fastener according to claim 1, wherein the protrusion is removable. 4. The blocking member for blocking the movement of the protrusion is provided on a rotational movement locus of the protrusion around the rotation center of the fastener. Item 4. A co-rotation preventing device for a fastener according to any one of items 3. 5. The co-rotation preventing device for a fastener according to claim 4, wherein the blocking member is a bolt or a rivet having a head portion at least with respect to the shaft portion.