JP3051542U - Waterproof washer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a waterproof washer that does not require a troublesome caulking operation and does not damage the surface of an object to be fixed. A metal washer body (1) having a short cylindrical peripheral wall (2) concentrically connected to a bolt insertion hole (3) at the center and connected to an outer peripheral portion on the back side; Rubber bush 4 fitted into washer body 1
And the spherical projection 1 having the center through hole 6 as a center.
2 is provided on the back side of the bush 4, and the spherical projection 12 protrudes from the back surface 2 a of the peripheral wall 2.

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal washer inserted between an object to be fixed and a head of a bolt when the bolt is fixed.

[0002]

2. Description of the Related Art A conventional metal washer is formed by punching a bolt insertion hole in the center of a circular metal plate, and the bolt received from a bolt through a head of the bolt is inserted into a bolt of a fixed object. A load is uniformly distributed around the hole.

However, since such a metal washer does not have any water stopping function itself, it is necessary to prevent water from entering through a gap between the bolt insertion hole of the object to be fixed and the bolt. However, it was necessary to carry out a caulking operation to coat and fill the bolt insertion hole and its surrounding area with a binder in advance.

In the case of a metal washer, the washer comes into direct contact with the surface of the object to be fixed, so that when the bolt is strongly tightened, the surface is damaged.

[0005]

[Problem to be Solved by the Invention] Accordingly, an object of the present invention is to provide a waterproof washer that does not require a troublesome coking operation and does not damage the surface of an object to be fixed.

[0006]

Means for Solving the Problems Hereinafter, the waterproof washer according to the present invention will be described with reference to the reference numerals in the attached drawings. And a rubber bush 4 fitted into the washer body 1 with the central through hole 6 communicating with the bolt insertion hole 3. A spherical convex portion 12 having a center is provided on the back side of the bush 4, and the spherical convex portion 12 protrudes from the rear surface 2 a of the peripheral wall 2.

The bolt 9 is inserted through the bolt insertion hole 3 of the washer body 1 and the central through hole 6 of the bush 4 into the bolt insertion hole 8 of the fixed object 7 and the bolt insertion hole 14 of the fixed object 13. When the nut 11 is screwed into the end of the bolt 9 and the bolt 9 is tightened to a predetermined torque, the tightening force of the bolt 9 is applied to the rubber bush 4 via the head 10 of the bolt 9 and the washer body 1. You. Due to this compressive load, the spherical convex portion 12 of the bush 4 that is in contact with the surface of the fixing object 7 is crushed, and the bolt fitting hole 8 of the fixing object 7 is sealed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, an annular ridge 5 on the front side of a rubber bush 4 is tightly fitted and fixed in a bolt insertion hole 3 of a washer body 1. When the annular raised portion 5 comes into close contact with the back surface of the head 10 of the bolt 9, the space between the bolt 9 and the washer body 1 is also sealed.

[0009]

[Effect of the Invention] As described above, the waterproof washer of the present invention communicates the rubber bush 4 in the metal washer body 1 with the bolt insertion hole 3 of the washer body 1 and the central through hole 6 of the bush 4. The spherical convex portion 12 formed on the back side of the bush 4 is crushed by tightening the bolt 9 to seal the bolt fitting hole 8 of the fixed object 7, thereby providing a sufficient amount. Since it has waterproof performance, no complicated coking work is required.

Since the spherical projection 12 of the rubber bush 4 protrudes from the back surface 2 a of the short cylindrical peripheral wall 2 of the washer body 1, the metal washer body 1 directly contacts the surface of the fixed object 7. And there is no danger of damaging the surface.

The spherical convex portion 12 of the bush 4 is formed with the center through hole 6 as a center, and the bolt insertion hole 3 of the washer body 1 for pressing the front side of the bush 4 is provided at the central portion. The convex portion 12 is uniformly pressed around the entire central through-hole 6, so that there is no place where the sealing is not perfect.

Further, since the outer periphery of the bush 4 is constrained by the short cylindrical peripheral wall 2 of the washer body 1, the tightening force of the bolt 9 does not dissipate outward, and the pressing force of the spherical convex portion 12 is reduced. And a good seal is obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a waterproof washer according to an embodiment of the present invention.

FIG. 2 is a rear view of the waterproof washer.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 1 in a state where the waterproof washer is used.

[Description of Signs] 1 Metal washer body 2 Peripheral wall of washer body 3 Bolt insertion hole of washer body 4 Rubber bush 5 Annular protrusion of bush 6 Bush bolt insertion hole 7 Fixing object 8 Bolt fitting of fixing object Insertion hole 9 Bolt 10 Bolt head 11 Nut 12 Spherical convex part of bush 13 Fixed object 14 Bolt insertion hole of fixed object

Claims (1)

[Utility model registration claims] 1. A metal washer body 1 in which a short cylindrical peripheral wall 2 is provided concentrically with a bolt insertion hole 3 in the center and connected to an outer peripheral portion on the back side; Rubber bush 4 fitted into the washer body 1
And the spherical projection 1 having the center through hole 6 as a center.
2 is a waterproof washer in which the spherical convex portion 12 is provided on the rear side of the bush 4 and the spherical convex portion 12 is projected from the rear surface 2 a of the peripheral wall 2.