JP2001153122A - Structure for bolt/nut fastening portion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the structure for a bolt and nut fastening portion making bolt and a nut fastening a structure hard to be loosen, and having a security function requiring quite a long time for removing. SOLUTION: In the structure for a bolt and nut fastening portion, a cup ring 3 is rotatably provided between a bolt 1, a nut 2 and a washer 5. The cup ring 3 and the washer 5 are provided between a head portion 1a of the bolt 1 and a member 7, and a projecting portion 5b of the washer is pressed by the bolt head portion 1a. The cup ring 3 and the washer 5 are provided between the nut 2 and a member 6, and the projecting portion 5b of the washer is pressed by the hexagonal nut 2 to fasten the member 6 and the member 7. The bolt and the nut are fastened/removed by a jig having engaging portions corresponding to notches 4a, 4b, 4c of a cylindrical portion 3a of the cup ring 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a fastening part using a bolt and a nut, and more particularly to a structure of a fastening part using a bolt and a nut in which a cup-shaped ring is rotatably provided between the bolt and the nut. It is about.

[0002]

2. Description of the Related Art In general, large structures such as steel towers, bridges, and railway facilities are assembled or mounted in many parts by fastening structures such as bolts and nuts. The bolts and nuts used for these fastenings are based on hexagons or squares, and can be easily tightened and loosened with a general tool such as a spanner or a monkey wrench. Exploiting the convenience of being able to easily tighten and loosen with such a general tool, an accident has occurred in which the fastening part with bolts and nuts is loosened and removed for the purpose of mischief or crime. To prevent the mischief and crime of loosening and removing such bolts and nuts,
It has been proposed to make the nut triangular so that it cannot be loosened with a common tool such as a spanner. For example, as shown in FIGS.
Are proposed in which the bolt 31 and the nut 32 for fastening are provided in a triangular shape, and the washer is provided with an outer peripheral wall 33. This is because the bolt 31 and the nut 32 are triangular,
It is difficult to loosen with a general tool such as a monkey wrench, and an outer peripheral wall 33 is provided on the washer to make it difficult for the bolt 31 and the nut 32 to engage with a tool such as a spanner.

[0003]

In order to prevent the conventional bolts and nuts from being removed, the bolts and nuts having a triangular shape must be special bolts and nuts, which is problematic in terms of cost. There is a problem that jigs for fastening them cannot be handled with a commonly used spanner, adjustable wrench, or the like. Further, in the case where the outer peripheral wall is provided on the washer, the bolt and the nut can be intentionally loosened by rotating the outer peripheral wall, and there is a problem that such an accident does not function sufficiently. It is an object of the present invention to provide a bolt having a security function that makes it difficult to loosen a commonly used bolt used for fastening a structure, a nut fastening portion, and takes a considerable amount of time to remove,
It is intended to provide a structure of a fastening portion by a nut.

[0004]

According to the present invention, in a structure of a fastening portion using a bolt and a nut, a cup-shaped ring is rotatably provided between the bolt, the nut and a washer. A cylindrical portion and a bottom portion having a hole, wherein the cylindrical portion has at least the same height as the height of the bolt head and the height of the nut, and is provided with a notch. It is characterized in that it is tightened and removed by a jig having an engaging portion corresponding to the notch of the cup-shaped ring cylindrical portion. Further, the structure of the fastening portion using the bolt and the nut of the present invention is such that the bolt and the nut are a hexagonal head bolt and a hexagonal nut, and the notch provided in the cylindrical portion of the cup-shaped ring does not become an opposing position. It is characterized by being provided in several places.

[0005]

In the structure of the fastening part of the present invention using a bolt and a nut, a cup-shaped ring is provided between the bolt and the nut and the washer, and the cylindrical part thereof is at least higher than the height of the head or the nut of the bolt. However, the fastening portion of the bolt or nut cannot be easily loosened and removed with a general tool. Further, since the cup-shaped ring is rotatably provided between the bolt or the nut and the washer, the fastening portion of the bolt or the nut is not loosened by rotating the cup-shaped ring. And the cup ring
A notch is provided in the cylindrical portion, and fastening and removal are performed by a jig having an engaging portion corresponding to the notch, that is, a specific relationship is established between the notch of the cup-shaped ring and the engaging portion of the jig. Because it has it, it has a high security function.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a fastening portion is fastened by ordinary bolts and nuts. For example, it is used for bolts and nuts having a relatively large diameter used for fastening structures such as steel towers, bridges, and railway facilities. In addition, the cup-shaped ring provided between the bolt and nut and the washer has a cylindrical part at least higher than the height of the bolt head and nut, and the bolts and nuts are easily loosened and removed with a general tool. The gap between the inner diameter of the cylindrical part, the head of the bolt, and the outer circumference of the nut is made as small as possible, so that no tools can enter the gap between the cup-shaped ring and the bolt or nut. It is preferable to do so. That is, it is preferable that the inner diameter of the cylindrical portion of the cup-shaped ring is slightly larger than the outer periphery of the head of the bolt or the outer periphery of the nut. In particular, to reduce the gap between the cup-shaped ring and the bolt or nut, a hexagonal head bolt or hexagonal nut is preferable to a square bolt or nut.

In the present invention, the cup-shaped ring is rotatably provided between the bolt or the nut and the washer. The cup-shaped ring is provided around the hole of the washer so that the washer receives the tightening force of the bolt or the nut. Provide a circumferential projection portion of, the circumference as a flat portion, put the bottom portion of the cup-shaped ring in the gap formed between the flat portion of the circumference of the projection portion of the washer and the head or nut of the bolt, It is provided rotatably. Further, a flat washer is used, a circumferential projection portion is provided on a bolt or a nut, a bottom portion of the cup-shaped ring is inserted, and the cup or ring is provided rotatably. That is, a circumferential projection around the shaft that applies the tightening force of the bolt or nut is provided, and the bottom of the cup-shaped ring is inserted into the gap formed between the flat portion around the projection and the flat washer, It is provided rotatably.

In the present invention, the fastening and removal of the fastening portion provided rotatably with the cup-shaped ring between the bolt, the nut and the washer correspond to the notch in the cylindrical portion of the cup-shaped ring. This is performed by engaging a jig having an engaging portion. A plurality of notches in the cylindrical portion of the cup-shaped ring are provided, and the engaging portions of the jig are engaged with the plurality of notches, and the bolt head and nut are pinched and tightened,
It is to remove. In particular, hex head bolts,
Hex nuts, notches provided in the cylindrical part of the cup-shaped ring are provided at three places that are not opposite each other at equal intervals, and the bolts on the hexagonal head and the non-parallel surface of the hexagon nuts It is preferable to hold and fasten at the joint to remove. By providing the cutouts of the cylindrical part of the cup-shaped ring at three locations that are not at equal intervals, the hexagonal head bolt and the parallel surface of the hexagonal nut cannot be clamped. The bolts and nuts cannot be easily loosened and removed with a tool.

[0009]

Embodiment 1 Embodiment 1 of the present invention will be described with reference to FIGS. First, a bolt and nut fastening portion according to the first embodiment will be described with reference to FIGS. FIG. 1 is a view showing the structure of a bolt and nut fastening portion, FIG. 2 is a view showing details of FIG. 1,
FIG. 3 is a perspective view of components showing the configuration of the bolt and nut fastening portion, FIG. 4A is a plan view of a washer constituting the fastening portion, and FIG.
5B is a cross-sectional view of FIG. 5A, FIG. 5A is a cross-sectional view of a cup-shaped ring forming a fastening portion, and FIG. 5B is a plan view.

As shown in FIG. 3, the structure of the fastening portion of the bolt and the nut is such that the member 6 and the member 7 are a hexagonal bolt 1, a cup-shaped ring 3, a washer 5, a member 7, a member 6, a washer 5, and a cup-shaped ring. 3 and a hexagonal nut 2. The member 6 and the member 7 are fastened by the bolt 1 and the nut 2 as shown in FIG. The washer 5 is shown in FIGS.
As shown in (b), it is composed of a flat portion 5a and a protruding portion 5b, and the protruding portion 5b is smaller than the hexagon bolt head 1a.

The cup-shaped ring 3 is shown in FIGS. 3 and 5 (a).
As shown in (b), it is composed of a cylindrical part 3a and a bottom part 3b. The inner diameter of the cylindrical portion 3a is slightly larger than the outer circumferences of the hexagonal bolt head 1a and the hexagonal nut 2. Cylindrical part 3
The height of “a” is at least approximately the same as the height of the head 1 a of the hexagonal bolt, and at least approximately the same as the height of the hexagonal nut 2. Notches 4a, 4b in the cylindrical portion 3a,
4c are provided in three places. Notches 4a, 4b,
4c are provided at equal intervals to form a triangle. The notch 4a opposes the wall surface of the cylindrical portion 3a, the notch 4b opposes the wall surface, and the notch 4 opposes the wall surface.
b and 4c are provided so as not to be respectively opposed to each other. This is because, when notches are provided at opposing positions, the two opposing parallel surfaces of the hexagon nut can be held by the spanner through the two notches at opposing positions, and are loosened. In order to prevent this, it is preferable that the notches 4a, 4b, and 4c are provided so as not to be located at positions facing each other.

The hexagonal bolt 1, cup-shaped ring 3, washer 5, member 7, member 6, washer 5, cup-shaped ring 3, and hexagonal nut 2 constituting such a fastening portion are shown in FIG.
As shown in FIG. 1, a cup-shaped ring 3 and a washer 5 are provided between the head 1a of the hexagon bolt 1 and the member 7, and the protruding portion 5b of the washer is pressed by the hexagon bolt head 1a.
The cup-shaped ring 3 and the washer 5 are provided between the
The hexagon nut 2 presses the protrusion 5b of the washer, thereby tightening the members 6 and 7.

Hex bolt head 1a and flat portion 5a of washer 5
The bottom portion 3b of the cup-shaped ring 3 is inserted into the gap. In addition, a bottom portion 3b of the cup-shaped ring 3 is inserted into a gap between the hexagon nut 2 and the flat portion 5a of the washer 5. FIG.
The hexagon nut 2, the washer 5, and the cup-shaped ring 3 will be described in detail. The hexagon nut 2 presses the projection 5 b of the washer 5 to tighten the member 6. The relationship between the hexagon bolt 1, the washer 5, and the cup-shaped ring 3 is the same. The height of the cylindrical portion 3 a of the cup-shaped ring 3 is substantially the same as the height of the hexagon nut 2. The inner diameter of the cylindrical portion 3a is a hexagon nut 2
Is slightly larger than the outer circumference (circumference of the vertices of the hexagon). This is to make the distance C3 between the cylindrical portion 3a of the cup-shaped ring 3 and the hexagonal nut 2 as small as possible so that the hexagonal nut 2 cannot be loosened by any tool.

The hole in the bottom portion 3b of the cup-shaped ring 3 has a spacing C1 with the projection 5b of the washer and a spacing C2 with the hexagonal nut 2. The cup-shaped ring 3 is turned between the nut 2 and the washer 5. It is movably installed. This is to prevent the nut 2 from being intentionally loosened by turning the cup-shaped ring 3. Further, when removing and tightening with a jig having an engaging portion corresponding to the notch, the cup-shaped ring 3 is turned to adjust the positions of the notches 4a, 4b, 4c of the cylindrical portion 3a and the hexagon nut 2. Is what you do.

Next, a jig for fastening and removing the bolt and nut fastening portions as described above will be described with reference to FIGS. 6, 7A, 7B and 7C. FIG. 6 is a diagram showing a bolt and nut fastening portion and a jig. FIG. 7 (a) is a plan view of a jig for fastening and removing, and FIG. 7 (b) is (a).
7A is a sectional view taken along the line AA, and FIG. 7C is a sectional view taken along the line BB of FIG. As shown in FIG. 6, the hexagon nut 2 presses the protruding portion of the washer 5 to tighten the members 6 and 7,
The bottom surface of the cup-shaped ring 3 is located in the gap between the hexagon nut 2 and the flat portion of the washer 5, and the cup-shaped ring 3 is rotatably provided between the nut 2 and the washer 5. The jig 10 for tightening and removing includes a cylindrical portion 12 and a head 1
One. The cylindrical portion 12 fits on the outer periphery of the cylindrical portion of the cup-shaped ring 3.

As shown in FIGS. 7 (a), 7 (b) and 7 (c), a jig 10 for tightening and removing is composed of a cylindrical portion 12 and a head 1.
The protrusions 13a, 13b, and 13c are provided on the inner surface of the cylindrical portion 12 so as to engage with the cutouts of the cylindrical portion. The protrusions 13a, 13b, and 13c of the cylindrical portion 12 are as shown in FIG.
(A) It engages with notches 4a, 4b, 4c provided at equal intervals in the cylindrical portion 3a of the cup-shaped ring 3 shown in (b), and engages with the convex portions 13a, 13b on the inner surface of the cylindrical portion 12. 1
The position of 3c corresponds to the position of the notch 4a, 4b, 4c, and the shape of the projection 13a, 13b, 13c corresponds to the shape of the notch 4a, 4b, 4c, and is provided so as to fit. Have been. The projections 13a, 13b, 1
3c is a nut 2 whose tip is shown by a chain line in FIG. 7 (c).
It comes in contact with the three faces.

When the nut 2 is to be tightened or removed by the jig 10, the cup-shaped ring 3 is rotated to position the three notches 4a, 4b, and 4c on the three surfaces of the nut 2, and The protrusions 13a, 13b, 13c of the part 12 are fitted into the notches 4a, 4b, 4c of the cup-shaped ring 3, and the cylindrical part 12 of the jig 10 is connected to the cylindrical part of the cup-shaped ring 3, as shown in FIG. To the outer circumference of. At this time, the cylinder 1
The tips of the projections 13a, 13b, and 13c of the second nut 3
In contact with two surfaces. Here, the jig 10 is rotated to rotate the nut 2. The rotation of the jig 10 is performed on the head 11 with a tool, for example, a spanner or a monkey wrench. If the shape and size of the head 11 are the same as those of the nut 2, the nut 2 and the jig 10 can be rotated with the same tool. Thus, the nut 2 is tightened by the jig 10,
It is to remove.

[0018]

Embodiment 2 Embodiment 2 of the present invention will be described with reference to FIGS. Embodiment 2 Embodiment 2 shows another embodiment of a jig for fastening and removing a fastening portion. FIG. 8 is a plan view of a jig for tightening and removing the bolt and nut fastening portions, FIG. 9 is a sectional view taken along line AA of FIG.
0 is a sectional view taken along the line BB in FIG. As shown in FIGS. 8 to 10, a jig 10 for tightening and removing is provided with a cylindrical portion 12.
And a head 11, and the inner surface of the cylindrical portion 12 is provided with convex portions 17 a, 17 b, and 17 c that engage with the cutouts of the cylindrical portion. The convex portions 17a, 17b, 17c of the cylindrical portion 12
The cylindrical part 3 of the cup-shaped ring 3 shown in FIGS.
notches 4a, 4b, 4c provided at equal intervals
And the projections 17a, 17 on the inner surface of the cylindrical portion 12.
The positions and shapes of b and 17c are notches 4a, 4b and 4c
It corresponds to those of and has come to fit. The projections 17a, 17b, and 17c are provided with screws 18a, 18b, and 18c, respectively.

When the nut 2 is to be tightened and removed by the jig 10 of the second embodiment, the protrusion 17a
17b and 17c are fitted into the notches 4a, 4b and 4c of the cup-shaped ring 3 shown in FIGS. 5 (a) and 5 (b). Next, the cup-shaped ring 3 is rotated, and the convex portions 17a,
Position 17b, 17c on the three faces of the nut, and screw 1
The tips of 8a, 18b and 18c are brought into contact with the three surfaces of the nut 2 indicated by chain lines in FIG. Here, the tool is engaged with the head 11 of the jig 10 and rotated, and the nut 2 is turned. Thus, the nut 2 is tightened and removed by the jig 10.

[0020]

Third Embodiment FIGS. 11 and 12 show a third embodiment of the present invention. Embodiment 3 is another embodiment of the engagement between the jig and the cup-shaped ring. FIG. 11 is a perspective view showing the engagement between the jig for tightening and removing and the cup-shaped ring. The cup-shaped ring 3 has a square notch 20a in the cylindrical portion 3a,
20b and 20c are provided at equal intervals. The jig 10 for tightening and removing has a cylindrical portion 12 and a head portion 11, and the cylindrical portion 12 has a square notch 20 a, 20 b, 20 c corresponding to the square notch 20 a, 20 b, 20 c of the cup-shaped ring 3. The projections 21a, 21b, 21c are provided correspondingly.

FIG. 12 is a perspective view showing the engagement between the jig for tightening and removing and the cup-shaped ring. The cup-shaped ring 3 has notches 4a, 4
b, 4c, and further, a projection 15 is provided on the outer periphery of the cylindrical portion 3a. The jig 10 for tightening and removing has a tubular portion 12 and a head 11. The cylindrical portion 12 fits on the outer periphery of the cylindrical portion of the cup-shaped ring 3, and convex portions 13a, 13b, and 13c are formed on the inner surface of the cylindrical portion 12 in correspondence with the shapes and positions of the notches 4a, 4b, and 4c. Further, a groove 14 is provided on the outer periphery of the cylindrical portion 3a at a shape and position corresponding to the projection 15. This is to enhance the security function by giving a specific relationship between the jig and the cup-shaped ring. FIG. 12 shows a combination of the protrusion 15 and the groove 14 of the jig 10 on the outer periphery of the cylindrical portion 3a. However, the protrusion provided on the outer periphery of the cylindrical portion of the cup-shaped ring, and the corresponding tightening, The shape, position, and number of grooves provided on the jig to be removed are appropriately determined,
By providing a specific relationship between the cup-shaped ring and the jig, the security function can be further enhanced.

[0022]

Fourth Embodiment FIG. 13 shows a fourth embodiment of the present invention. Embodiment 4 shows a structure of a fastening portion in which a cup-shaped ring is provided on a double nut. As shown in FIG. 113, a hexagon bolt 1, a cup-shaped ring 3, a washer 5, a member 7, a member 6, a washer 2c, a hexagon nut 2b, a washer 5, a cup-shaped ring 3, and a hexagon nut 2a are located. Hex head 1
a, the protruding portion 5b of the washer is pressed, the member 6 is tightened with the hexagon nut 2b, and the protruding portion 5b of the washer is pressed on the member 6 with the hexagon nut 2a to fix the member 6 and the member 7. Therefore, the fastening portion of the double nut cannot be easily loosened and removed.

[0023]

As described above, according to the structure of the fastening portion in which the cup-shaped ring is provided between the bolt, the nut and the washer of the present invention, the fastening portion of the bolt or the nut can be easily formed with a general tool. It cannot be loosened and cannot be removed, and since the cup-shaped ring is provided rotatably, turning the cup-shaped ring does not loosen the fastening parts of bolts and nuts. The shape ring is provided with a notch in the cylindrical portion, and is tightened and removed by a jig having a corresponding engaging portion, and has an effect of high security function.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a fastening portion according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating details of a fastening portion according to the first embodiment of the present invention.

FIG. 3 is a perspective view of components showing a configuration of a fastening portion according to the first embodiment of the present invention.

FIG. 4 is a view showing a washer constituting a fastening portion of the fastening portion according to the first embodiment of the present invention.

FIG. 5 is a view showing a cup-shaped ring constituting a fastening portion of the fastening portion according to the first embodiment of the present invention.

FIG. 6 is a view showing a jig according to the first embodiment of the present invention.

FIG. 7 is a view showing a jig according to the first embodiment of the present invention.

FIG. 8 is a view showing a jig according to a second embodiment of the present invention.

FIG. 9 is a view showing a jig according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a jig according to a second embodiment of the present invention.

FIG. 11 is a diagram showing engagement between a jig and a cup-shaped ring according to a third embodiment of the present invention.

FIG. 12 is a diagram showing engagement between a jig and a cup-shaped ring according to a third embodiment of the present invention.

FIG. 13 is a diagram showing a structure of a fastening portion according to a fourth embodiment of the present invention.

FIG. 14 is a diagram showing a conventional fastening portion.

[Explanation of symbols]

 1. Bolt 2. Nut 3. Cup ring 4a, 4b, 4c. Notch 5. Washer

Continued on the front page (72) Inventor Tomohisa Tanabe 2-4-4 Shirogane, Minato-ku, Tokyo (72) Inventor Hideaki Oki 4-1-18-203 Kirigaoka, Midori-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Yasuo Kobayashi Tokyo 2-23-17 Ohashi, Meguro-ku, Tokyo (72) Inventor Kurachi 4-17-10-401 Taishido, Setagaya-ku, Tokyo

Claims (2)

[Claims] 1. A structure of a fastening portion comprising a bolt and a nut, wherein a cup-shaped ring is rotatably provided between the bolt, the nut and a washer, and the cup-shaped ring has a cylindrical portion and a bottom portion having a hole. The cylindrical portion, the height of which is at least the height of the head of the bolt, the same or higher than the height of the nut, and is provided with a notch, and the cup-shaped ring cylindrical portion A structure for fastening a bolt and a nut, wherein the structure is tightened and removed by a jig having an engagement portion corresponding to the notch. 2. The bolt and the nut are hexagonal head bolts and hexagonal nuts, and cutouts provided in the cylindrical portion of the cup-shaped ring are provided at three places that are not opposed to each other. The structure of the fastening part by the bolt and the nut according to claim 1.