JP2001050238A - Washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washer ensuring prevention of a nut from loosening due to vibration by further improving the tightening force to a nut and a member. SOLUTION: This washer used below nut in tightening a bolt has through- holes 6 formed with protrusions on the surfaces or reverses. The through-holes 6 are formed in number in the spring washer L with properly spaced relation and the adjacent through-holes 6 are so arranged that the protrusions are alternated with each other on the surface 3 or reverse 4 of the spring washer 1. The through-holes 6, formed to be circular, can be semicircular or polygonal, as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer capable of reliably preventing a nut from loosening when a member is fastened with a bolt by further increasing the fastening force to the nut and the member.

[0002]

2. Description of the Related Art Conventionally, when a member is fastened with a bolt, a thin plate-shaped washer has been arranged under a nut. Usually, the washer is used when the bolt hole diameter is too large for the bolt, when a material having a low withstand pressure is fastened, or when the receiving surface is rough or inclined.

[0003] Common washers include flat washers, tongue washers, spring washers, and the like, and are formed of a material such as metal, plastic, or rubber, and are used in various ways depending on the application.

[0004]

However, in the conventional washer, vibration causes friction between the washer and the nut or between the washer and the member due to the vibration, so that the fastening force of the nut is reduced and the bolt is loosened. There was a disadvantage.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a washer capable of reliably preventing the nut from loosening due to vibration or the like by further improving the fastening force to the nut and the member. .

[0006]

In order to achieve the above-mentioned object, a through hole having a projection formed on the front or back surface of the washer is formed.

Further, through holes are formed so that the projections alternate with each other on the front and back surfaces of the washer.

Further, the through hole is formed in an inner peripheral edge of the washer.

Further, the through hole is formed in the outer peripheral edge of the washer.

[0010] The through hole is formed by a punch.

By piercing a through hole having a projection on the front or back surface of the washer, the projection can bite into the nut and the member during fastening, and the fastening force can be further improved.

[0012] Further, by forming through-holes so that the convex portions alternate with each other on the front and back surfaces of the washer,
Fastening force is further improved and nut loosening can be reliably prevented.

Further, by forming the through holes in the inner peripheral edge and the outer peripheral edge of the washer, it is possible to cope with a member having any width.

Furthermore, by piercing the through hole with a punch, the through hole can be easily and quickly pierced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 is an overall perspective view of a washer of the present invention, FIG. 2 is a cross-sectional view showing a state where a through hole is punched by a punch, FIG. 3 is a cross-sectional view showing an installed state of the washer, and FIG. 5 shows a state in which a through hole is bored in the outer peripheral edge of the washer, FIG. 6 shows an overall view of the washer in another shape, and FIG. 7 shows a state of use of the washer.

Reference numeral 1 denotes a metal spring washer having a cutout 2 in one place, and the spring washer 1 has a protrusion 5 formed on the front surface 3 or the back surface 4 and having a suitable size. Hole 6
Are perforated.

As shown in FIG.
The spring washer 1 is placed on a die 10 having a hole 1, and a punch 12 having a slightly smaller diameter than the hole 11 is used.
Drilled by instantaneous shearing. At this time, a projection 5 (burr) formed by a gap between the hole 11 and the punch 12 is formed around the lower side of the through hole 6.

The spring washer 1 in which the through holes 6 and the projections 5 are formed in the above process is heated to a high temperature, rapidly cooled, quenched, and hardened. Further, the washer of the present invention is not limited to a spring washer and may be a flat washer.

A plurality of the through holes 6 are formed in the spring washer 1 at appropriate intervals.
Are arranged such that the protrusions 5 alternate with each other on the front surface 3 or the back surface 4 of the spring washer 1. The through hole 6 is formed in a circular shape in the figure, but is not limited to this, and may be formed in a semicircular or polygonal shape.

Next, a method of using the washer of the present invention and its operation will be described with reference to FIG.

The member 22 is fastened with the bolt 20 and the nut 21. At this time, the spring washer 1 is arranged between the head 23 of the bolt 20 and the member 22, or the spring washer 1 'is arranged between the nut 21 and the member 22. In this state, the nut 21 or the bolt head 23 is rotated with a spanner or the like.

When the bolt head 23 is tightened with a spanner, the convex portion 5 of the surface 3 of the spring washer 1 bites into the bolt head 23 to form a concave portion 24. At the same time, the convex portion 5 on the back surface 4 of the spring washer 1 bites into the member 22, and the concave portion 25 is formed.

When the nut 21 is tightened with a spanner, the convex portion 5 of the surface 3 of the spring washer 1 'bites into the nut 21 to form a concave portion 26. At the same time, the convex portion 5 of the back surface 4 of the spring washer 1 'bites into the member 22, and the concave portion 27
Is formed. Therefore, the fastening force is further improved,
Looseness of the nut can be reliably prevented.

Next, another preferred embodiment of the washer of the present invention will be described with reference to FIGS.

FIG. 4 shows a state in which a through hole 6 is bored in the inner peripheral edge 7 of the spring washer 1. In the adjacent through hole 6, the convex portion 5 has a surface 3 or the inner peripheral edge 7 of the spring washer 1. On the back surface 4, they are arranged alternately. Therefore, it is suitable for tightening a narrow member 22.

FIG. 5 shows a state in which a through hole 6 is bored in the outer peripheral edge 8 of the spring washer 1, and the adjacent through hole 6 has a protrusion 5 formed on the surface 3 or the outer peripheral edge 8 of the spring washer 1. On the back surface 4, they are arranged alternately. Therefore, it is suitable for tightening the wide member 22.

In FIG. 6, a rectangular washer 30 is shown.
2 shows a state in which a plurality of through holes 6 are formed. The washer 3
A plurality of through-holes 6 each having the convex portion 5 provided on the front surface 31 are arranged on one side and the opposite side, and a through-hole having the convex portion 5 provided on the back surface 32 is provided on each adjacent side. 6 '
Are arranged in a plurality.

In FIG. 7, the washer 30 is
The state used for connecting and fixing the steel 33 is shown. Even in this case, when the bolt 20 is fastened, the protrusion 5 of the through hole 6 is
The nut 21 bites into the zero head 23, the H steel 33, and the nut 21 to further improve the fastening force of the bolt 20 and reliably prevent the nut 21 from loosening.

[0029]

As described above, the washer of the present invention has the following effects by adopting the above structure.

By piercing a through hole having a projection on the front or back surface of the washer, the projection can bite into the nut and the member during fastening, and the fastening force can be further improved.

Further, by forming through-holes such that the protrusions alternate with each other on the front and back surfaces of the washer,
The fastening force is further improved, and loosening of the nut can be reliably prevented.

Further, by piercing the through hole in the inner peripheral edge or the outer peripheral edge of the washer, it is possible to cope with a member having any width.

Further, by piercing the through hole with a punch, the through hole can be easily and quickly pierced.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a washer of the present invention.

FIG. 2 is a sectional view showing a state in which a through hole is punched by a punch.

FIG. 3 is a cross-sectional view showing an installation state of a washer.

FIG. 4 shows a state in which a through hole is formed in the inner peripheral edge of the washer.

FIG. 5 shows a state in which a through hole is formed in the outer peripheral edge of the washer.

FIG. 6 shows an overall view of a washer having another shape.

FIG. 7 shows a use state diagram of the washer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spring washer 1 '... Spring washer 2 ... Notch part 3 ... Front surface 4 ... Back surface 5 ... Convex part 6 ... Through hole 6' ... Through hole 7 ... Inner peripheral edge 8 ・ ・ ・ Outer peripheral edge 10 ・ ・ Die 11 ・ ・ Hole 12 ・ ・ Punch 20 ・ ・ Bolt 21 ・ ・ Nut 22 ・ ・ Member 23 ・ ・ Head 24 ・ ・ Recess 25 ・ ・ Recess 26 ・ ・ Recess 27 ・・ Recess 30 ・ ・ Washer 31 ・ ・ Front 32 ・ ・ Back 33 ・ ・ H

Claims (5)

[Claims] 1. A washer used under a nut when tightening a bolt, wherein a through hole having a convex portion formed on a surface or a back surface of the washer is formed. 2. The washer according to claim 1, wherein the projections have through holes formed alternately on the front and back surfaces of the washer. 3. The washer according to claim 1, wherein the through hole is formed in an inner peripheral edge of the washer. 4. The washer according to claim 1, wherein the through hole is formed in an outer peripheral edge of the washer. 5. The washer according to claim 1, wherein the through hole is formed by a punch.