JP2002005150A - Insulating washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of forgetfulness of installing an insulating washer and the loss of the insulating washer by installing the insulating washer without caring about an installing surface of the insulating washer when installing the insulating washer, and integrating the washer and a male screw when removing the male screw. SOLUTION: In an annular ring-shaped insulating washer composed of a synthetic resin material and inserting a shaft part of the male screw, the insulating washer is provided with a collar part having a diameter almost equal to a diameter of a head part of the male screw or an outer diameter of a diameter larger than the diameter of the head part of the male screw and having an inner diameter larger than the diameter of the shaft part of the male screw, a fin part having a thick part arranged in an annular ring shape on the inner periphery of the collar part, having the thickness gradually thinning toward the center from the thick part and having a hole having a diameter smaller than the diameter of the shaft part of the male screw and a joining part having a V-shaped groove part for joining the collar part and the fin part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating washer that is inserted into the outer periphery of a shaft of a male screw and used.

[0002]

2. Description of the Related Art As shown in a sectional view of a main part of FIG. 3, when a printed circuit board 2 having a copper foil surface 1 on one side is attached to a chassis such as a chassis 3 with a male screw 4, the copper foil surface 1 and the chassis 3 are fixed. The male screw 4
And the copper foil surface 1 via an insulating washer 5.

[0003] The insulating washer 5 has a hole 5a at the center thereof for loosely inserting the shaft portion 6 of the male screw 4, and a flange portion having a diameter substantially equal to or slightly larger than the diameter of the head of the male screw. 5b and an annular projection 5c provided on the inner periphery of the flange 5b.

When the printed circuit board 2 is mounted on the chassis 3 using the insulating washer 5, an annular projection 5c is inserted from the copper foil surface 1 side into the hole 2a provided on the printed circuit board 2, and the flange 5b is attached. It is brought into contact with the copper foil surface 1 and fixed with the male screw 4.

[0005]

However, since the above-mentioned conventional insulating washer has an annular projection, it is necessary to mount the insulating washer while checking the mounting direction. Further, in the conventional insulating washer, when the male screw is removed, the insulating washer and the male screw are separated from each other, so that when the male screw is reinstalled, the insulating washer may be forgotten to be attached or the insulating washer may be lost.

According to the present invention, when an insulating washer is attached, it can be attached without worrying about the mounting surface of the insulating washer. When the male screw is removed, the insulating washer becomes integral with the male screw. An object of the present invention is to prevent occurrence of forgetting to attach an insulating washer, loss of the insulating washer, and the like.

[0007]

According to a first aspect of the present invention, there is provided an insulating washer made of a synthetic resin material and capable of inserting a shaft portion of a male screw into the annular washer. A flange having a diameter substantially equal to the diameter of the head of the male screw, or an outer diameter having a diameter larger than the diameter of the head of the male screw, and an inner diameter larger than the diameter of the shaft of the male screw, A fin portion having a thick portion provided in an annular shape on the inner periphery of the flange portion, and having a hole having a diameter smaller than the diameter of the shaft portion of the male screw, the thickness gradually decreasing from the thick portion toward the center. And a connecting portion having a V-shaped groove for connecting the flange portion and the fin portion.

According to a second aspect of the present invention, there is provided an insulating washer according to the first aspect.
The synthetic resin material is made of any one of nylon, polyethylene and polypropylene.

According to a third aspect of the present invention, in the insulating washer according to the first or second aspect, the fin portion is provided with a notch radially.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an insulating washer according to the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a state of an insulating washer before attaching a male screw of the present embodiment, and FIG. 2 is a cross-sectional view showing a use mode of the insulating washer of the present embodiment.

In FIG. 1, an insulating washer 11 made of a synthetic resin material (for example, nylon or the like) has an outer diameter substantially equal to the diameter of the head of the male screw 12 or larger than the diameter of the head of the male screw. A flange portion 14 having an inner diameter larger than the diameter of the shaft portion 12a of the male screw 12 is formed.

Thick portion 1 provided in an annular shape on the inner periphery of flange portion 14
3c and a fin portion 13 having a hole 13d having a diameter smaller than the diameter of the shaft portion 12a of the male screw 12 with a gradually decreasing thickness from the thick portion 13c toward the center. Collar 14
And the fin portion 13 are provided with V-shaped groove portions 13a provided on both surfaces,
13b, and are integrally formed.

FIG. 2 shows the use mode of FIG. 1 and shows a state in which the printed circuit board 2 is screwed to the chassis 3. That is, using the insulating washer 11 shown in FIG.
When the printed circuit board 2 having the copper foil surface 1 on the upper surface is screwed to the chassis 3, the shaft portion 12a of the male screw 12 for fixing is used.
Is lightly inserted into the hole 13d of the fin portion 13 of the insulating washer, and the male screw 12 is screwed from the hole 2a provided on the printed circuit board 2 into the screw hole 3a provided on the chassis 3.

The insulating washer 11 has a hole 13d which is pushed out by the shaft portion 12a of the male screw 12 and a V-shaped groove 13a in a direction in which the connecting portion 15 is screwed.
It is bent from 13b and guided by the thick portion 13c,
A male screw 12 is screwed into substantially the center of the hole 2a provided in the printed circuit board 2.

Accordingly, since the copper foil surface 1 on the upper surface of the printed circuit board 2 is insulated by the insulating washer 11, there is no conduction with the chassis 3 by the male screw 12.

Printed circuit board 2 via insulating washer 11
When the male screw 12 is loosened from a state in which the male screw 12 is screwed to the chassis 3, the insulating washer 11
The male screw 12 comes off in a state of being screwed to the root of the shaft portion 12a of the male screw 12. Therefore, when the male screw 12 is removed, the insulating washer 11 is integrated with the male screw 12, and it is possible to prevent the mounting of the insulating washer 11 or the loss of the insulating washer.

In another embodiment, the fin 13 of the insulating washer 11 may be cut radially. By making the cut radially, the diameter of the hole 13 d of the fin portion 13 can be easily expanded, so that the insulating washer 11 can be easily inserted into the shaft portion 12 a of the male screw 12.

[0018]

According to the present invention, since the insulating washer has no projection, the insulating washer can be mounted without worrying about the mounting surface of the insulating washer. Further, when the male screw is removed, the insulating washer comes off integrally with the screw, so that when the male screw is mounted again, it is possible to prevent the insulation washer from being forgotten to be attached or the insulating washer from being lost.

[Brief description of the drawings]

FIG. 1 is a sectional view of an insulating washer showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a usage mode of an insulating washer according to one embodiment of the present invention.

FIG. 3 is a sectional view of a main part showing a conventional example.

[Explanation of symbols]

1 Copper foil surface 2
Printed circuit board 2a Hole 3
Chassis 3a Screw hole 4
Male screw 5 Insulation washer 5a
Hole 5b Flange 5c
Projection 6 Shaft 11 Insulated washer 12
Male screw 12a Shaft 13
Fins 13a, 13b Grooves 13c
Thick part 13d hole 14
Flange 15 Joint

Claims (3)

[Claims] 1. An annular insulating washer made of a synthetic resin material and capable of inserting a shaft portion of a male screw, wherein the insulating washer has a diameter substantially equal to a diameter of a head of the male screw or a diameter of the male screw. A flange portion having an outer diameter larger than the diameter of the head portion and an inner diameter larger than the diameter of the shaft portion of the male screw; and a thick portion provided in an annular shape on the inner periphery of the flange portion. A coupling having a fin portion having a hole whose diameter is gradually reduced from the thick portion toward the center and smaller than the diameter of the shaft portion of the male screw, and a V-shaped groove coupling the flange portion and the fin portion. An insulating washer comprising: a part; 2. The insulating washer according to claim 1, wherein the synthetic resin material is made of any one of nylon, polyethylene, and polypropylene. 3. The insulating washer according to claim 1, wherein the fin portion is provided with a notch radially.