JPH0589915A - Earthing device - Google Patents

Abstract

PURPOSE:To provide a secure electrical contact between an earthing device connected to an electric wire and a metal fitting when the electric wire drawn from a circuit is grounded to an electric appliance main body. CONSTITUTION:An electric body part 2 swelling in the radial direction is provided midway on an earthing device main body 1 formed in such a diameter that it can pass through an insertion hole (b) provided in a metal fitting (a), cantilever elastic protrusions 3 and 4 protruding radially from both side parts sandwiching the body part 2 therebetween are projected, a wire stopper 5 for stopping and attaching the end of the wire on the end of the earthing device main body 1. Only inserting into the insertion hole (b) in the metal fitting (a) enables simple attachment, and pulling and pushing cause no coming-off, while ensuring electrical contact with the metal fitting (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding device used for grounding an electric wire drawn from an electric circuit of various equipment to a metal fitting provided on the equipment.

[0002]

2. Description of the Related Art Conventionally, when a circuit built in an electric device is grounded to a metal fitting, the lead end of an electric wire drawn from the circuit is directly soldered to the metal fitting.
However, as is well known, an electric wire as a ground wire drawn out from an electric circuit has almost no shape retention property, so that it is difficult to mechanically position the drawn end,
Therefore, it is very difficult to automate the soldering of this type of ground wire in connection with its cost and the like.

Therefore, it is conceivable to use a commercially available connection pin as shown in FIGS. 11 to 13, for example, instead of the method of connecting the wire and the metal fitting by soldering. The pin shown in these figures has a plurality of cantilevered projections 22 that radially project to the middle portion in the longitudinal direction of the pin body 21 that can be inserted into the insertion hole b provided in the metal fitting a.
A stopper piece 23 is provided on the outer peripheral surface of the pin body 21 at a proper distance from the protrusions 22, and a wire stopper 24 for fixing the end of the wire and a coating for sandwiching the wire coating. It is provided with a stop 25.

As shown in FIG. 13, the pin having the above-mentioned structure inserts the pin body 21 into the insertion hole b of the metal fitting a to prevent the pin 22 from coming off from the insertion hole b by the projection 22 and the stopper piece 23.
The protrusion 22 and a portion of the pin body 21 that is inserted into the metal fitting insertion hole b are brought into contact with the metal fitting a so as to be electrically connected to the metal fitting a.

[0005]

However, when the above-mentioned conventional pin is used, the pin body 21 is formed to be thinner than the diameter of the insertion hole b of the metal fitting a, and
Since the distance between the projection 22 and the stopper piece 23 is slightly longer than the length of the insertion hole b, there is a gap between each part of these pins and the metal fitting a, so that the electrical contact is not reliable. Further, even if the distance between the projection 22 and the stopper piece 23 is narrower than the length of the insertion hole b, the projection 22 is flexibly deformed or elastically deformed, so that the metal fitting a and the pin are reliably contacted with each other. There was a problem that was not obtained.

The present invention is intended to solve such a conventional problem, and to provide a grounding device configured to surely come into contact with a metal fitting only by being inserted into an insertion hole of the metal fitting. It is intended.

[0007]

In order to achieve the above object, the present invention provides a grounding device main body having a diameter that can be inserted into an insertion hole provided in a metal fitting, and an intermediate portion in the longitudinal direction of the device main body. A body portion that bulges in the radial direction to elastically contact the insertion hole of the metal fitting, and the free end portions of the outer peripheral surface of the grounding device main body outer peripheral surface closely oppose each other. A plurality of cantilevered elastic projections protruding in the radial direction are provided so as to project, and a wire stopper for fixing the end of the electric wire is further provided at the end of the grounding device body.

In the above structure, if a plurality of small projections are provided on the outer surface of the body portion, more reliable electrical contact can be obtained between the metal fitting and the body portion.

[0009]

[Operation] When the main body of the grounding device is inserted into the insertion hole of the metal fitting, the cantilever elastic protrusion on the front side in the insertion direction elastically deforms inward and passes through the insertion hole, and when the insertion hole is exited, the original protruding state is restored. The grounding device main body is prevented from coming off due to the cantilevered elastic projections on both sides of the body portion, as a result of elastic restoration or pressure contact with the metal member to push it further outward. Further, the body portion having a shape that bulges in the radial direction is located inside the insertion hole and is in pressure contact with the inner surface of the insertion hole. Therefore, the grounding device main body is in constant electrical contact with the metal fitting by the cantilevered elastic projections and the body portion, and is reliably connected to the electric wire as the ground wire through the wire stopper provided in the grounding device main body. It is a thing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. In these drawings, reference numeral 1 denotes a grounding device main body, which is formed in a pin shape having a slightly smaller diameter than the insertion hole b provided in the metal fitting a, and has a body portion 2 substantially at the center in the longitudinal direction. Are formed. An end portion of the body portion 2, which is in the middle of the grounding device body in the lengthwise direction, bulges radially, and the bulging portion is inserted into the insertion hole b of the metal fitting a.
It is configured to elastically contact the inner peripheral surface.

Reference numerals 3 and 4 denote tongue-shaped cantilevered elastic projections formed by cutting and raising from both side portions sandwiching the body portion 2 on the outer peripheral surface of the grounding device main body 1. The protrusion 3 and the other protrusion 4 are formed such that the free ends thereof closely face each other and project in the radial direction.

Reference numeral 5 is a wire stopper for fixing the end portion of the electric wire c, which is a ground wire, which is provided at the end portion of the grounding device main body 1. In this embodiment, it is formed in a hollow ring shape, and the electric wire c is It is fixed by inserting and crushing, or by soldering.

In the above structure, as shown in FIG. 3, when the grounding device main body 1 is inserted from the tip into the insertion hole b of the metal fitting a in the direction of the arrow, one of the protrusions that has entered the insertion hole b in the middle of the insertion. 3 and the body part 2 are, as shown in FIG.
It comes into contact with the inner surface of the insertion hole b and is elastically deformed inward. As shown in FIG. 5, the grounding device body 1 is inserted until the other protrusion 4 abuts against the side surface of the metal fitting a, and further inserted as shown in FIG. 6 against the biasing force of the other protrusion 4. When one of the protrusions 3 is removed from the insertion hole b, the protrusion 3 elastically restores to the original protruding state, and the free end of the protrusion 3 is pressed against the other side surface of the metal fitting a, whereby the grounding device and the metal fitting are connected. a is held in a state in which it does not come off in both directions by pressure contact between both projections 3 and 4 and both side surfaces of the metal fitting a, and the body portion 2 arranged between these projections 3 and 4 is attached to the inner peripheral surface of the insertion hole b. It is always kept in a pressed state.

7 and 8 show another embodiment of the present invention. In the grounding device shown in these figures, the wire stopper is used.
5a is composed of plate-shaped pieces rising from both sides of the grounding device body 1. By inserting the end of the electric wire c between these plate-shaped pieces, folding and crushing the plate-shaped pieces, and soldering as necessary. It is something to fasten. Further, 6 is a film stopper for sandwiching the end portion of the wire coating d, and is formed by a plate-shaped piece slightly longer than the plate-shaped piece constituting the wire stopper 5a.

9 and 10 show still another embodiment of the present invention. In the grounding device shown in these figures,
In order to ensure the contact between the body portion 2 and the insertion hole b of the metal fitting a, a plurality of small protrusions 7 in the shape of ridges are provided on the outer surface of the body portion 2.

[0016]

As described above, according to the grounding device of the present invention, the swelling in the radial direction is formed in the lengthwise intermediate portion of the grounding device main body formed to have a diameter that can be inserted into the insertion hole provided in the metal fitting. A plurality of pieces are provided in which a body portion that elastically contacts the insertion hole of the metal fitting is provided, and the free end portions of the outer peripheral surface of the grounding device main body outer peripheral surface project in the radial direction in close proximity to each other. Since the holding elastic protrusions are provided so as to project, the cantilever elastic protrusions on both sides of the body part prevent the grounding device main body from coming off, and the body part that is bulged in the radial direction is located inside the insertion hole. Press contact with the inner surface of the hole.

Therefore, the grounding device main body is in constant electrical contact with the metal fitting by the cantilevered elastic projections and the body portion, and the grounding device main body is securely connected to the electric wire as the ground wire through the wire stopper provided in the grounding device main body. It is connected. As described above, according to the present invention, the grounding device can be easily attached to the metal fitting, and the electrical contact can be surely made, which is very effective in improving workability.

According to the second aspect, since the plurality of small projections are provided on the outer surface of the body portion, the small projections come into pressure contact with the insertion hole of the metal fitting, whereby the space between the metal fitting and the body portion. Therefore, a more reliable electrical contact can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

[Figure 2] Front view

FIG. 3 is a plan view before inserting the grounding device into the metal fitting.

FIG. 4 is a plan view during insertion.

FIG. 5 is a plan view showing the state of further insertion

FIG. 6 is a plan view after insertion is completed.

FIG. 7 is a plan view showing another embodiment of the present invention.

FIG. 8 is a front view thereof.

FIG. 9 is a plan view showing still another embodiment of the present invention.

FIG. 10 is a front view thereof

FIG. 11 is a plan view of a conventional example.

FIG. 12 is a front view thereof

FIG. 13 is a plan view after the insertion into the metal fitting is completed.

[Explanation of symbols]

 1 Grounding device body 2 Body part 3 Cantilever elastic protrusion 4 Cantilever elastic protrusion 5 Wire stopper 5a Wire stopper 7 Small protrusion a Metal fitting b Insertion hole

Claims (2)

[Claims] 1. A grounding device main body that can be inserted into an insertion hole provided in a metal fitting, and is bulged in a radial direction at an intermediate portion in the longitudinal direction of the grounding device main body to elastically contact the insertion hole of the metal fitting. A plurality of cantilevered elastic projections are provided, which are provided with a body portion, and whose free end portions are closely opposed to each other and project in a radial direction from both side portions of the outer peripheral surface of the grounding device main body that sandwich the body portion. A grounding device in which a wire stopper for fixing the end of the electric wire is provided at the end of the grounding device body. 2. The grounding device according to claim 1, wherein a plurality of small projections are provided on the outer surface of the body portion.