JPH0722051Y2 - connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a loose contact prevention shape of a connector in a connector for connecting electric wires in a screw tightening manner.

[Prior Art] As a contact, a contact made of an elastic material that is in pressure contact with a connecting pin of a connector on a side to be fitted, a frame-shaped clamp into which a connecting piece extended from the contact is inserted,
There is a screw which is tightened by a clamp and pushes the connecting piece by tightening to clamp the core wire of the electric wire between the clamp and the clamp, and which connects the electric wire with a screw.

[Problems to be solved by the invention] By the way, the connection piece 3b of the contact 3 of this type of connector
Had a substantially flat plate shape as shown in FIG. For this reason, when the core wire of the multi-core electric wire is separated due to the temperature change over time, the contact pressure of the connection piece 3b is reduced, which causes a problem of loose contact.

Therefore, as shown in FIG. 7, there is a screw contact portion formed in a corrugated shape. In this case, although it is better than that in FIG. 6 described above, there is still a possibility that loose contact may occur. there were.

The present invention has been made in view of the above points, and an object of the present invention is to provide a connector that does not easily become a loose contact.

[Means for Solving the Problems] In order to achieve the above-mentioned object, according to the present invention, the contact portion of the screw of the contact piece of the connection piece facing the clamp is a flat plate-shaped flat portion, and the core wire of the electric wire is inserted. A pair of curved portions that are curved so as to project toward the clamp side are formed at both end portions of the flat surface portion in the direction and facing the clamp.

[Operation] According to the present invention, the elastic member of the contact is formed as described above, and the abutting portion of the screw is a flat surface portion, and the curved portions protruding toward the clamp side are formed at both ends of the flat surface portion. Even if the core wire of a multi-core electric wire is loosened due to a change in temperature, the connecting piece follows the spring property of the connecting piece to reduce the contact pressure drop and prevent loose contact. is there. That is, when the tip of the screw approaches the clamp by tightening the screw, the tip of the curved portion comes into contact with the core wire of the electric wire, and when the screw is further tightened, the elasticity of the connection piece causes the flat surface portion to bend toward the core wire side of the electric wire. It will be. Since the connecting piece is made of an elastic material, when the flat part bends, a spring force acts to press the curved part toward the clamp side, and as a result, the core wire of the wire is clamped with a force larger than the force due to the screw tightening. It can be sandwiched between them. Moreover, it is possible to prevent loose contact even when the electric wire is separated by following the change in the distance between the connection piece and the clamp due to the separation of the core wire of the electric wire due to the bending of the connection piece.

[Embodiment] FIGS. 1 to 3 show an embodiment of the present invention. The connector of this embodiment is detachably attached to, for example, a connector (not shown) mounted on a printed circuit board or the like and having a plurality of connection pins (hereinafter referred to as a post to distinguish this connector from the connector to which the present invention is applied). The contacts 3 are connected to each other and press-contact with the connection pins, respectively, and a clamp 4 and a screw 5 for connecting the electric wire 10 to the contact 3 by a screw tightening method.

As shown in FIG. 2, the case of this connector comprises a housing 1 and a cover 2. The housing 1 has a box-like shape with an open rear surface, and has a structure in which a contact 3, a clamp 4 and a screw 5 corresponding to one electric wire 10 are housed in a direction orthogonal to the plane of the drawing, and bulges forward. The lower part of the front surface is fitted into the post, and at this time, the connection pin implanted in the post is inserted from the pin insertion hole 6 formed at the tip of the bulging portion 1a and is housed in the bulging portion 1a. The contact 3 is pressure-welded to be electrically connected to the post. A clamp 4 is fixedly housed behind the contact 3, and a screw 5 is screwed into the clamp 4. A screw tightening hole 7 is formed in a portion of the housing 1 corresponding to the head of the screw 5. The cover 2 is attached so as to close the rear opening of the housing 1, and a plurality of electric wire insertion ports 8 are formed in a portion corresponding to the clamp 4.

The contact 3 is made of an elastic material, and has, for example, two press-contact pieces 3a whose bases are connected so as to press-contact a connection pin on the post side and face each other (see FIG. 4). The connection pin inserted from the pin insertion hole 6 drilled at the tip of the portion 1a is elastically sandwiched between the press-contact pieces 3a at the portions where the distance between the tip portions is narrow, so that the connection pin is electrically connected to the connection pin. Is done. This contact 3
From there, a connecting piece 3b according to the present invention is extended to the back, and this connecting piece 3b is inserted into the clamp 4.

The clamp 4 is formed by bending a flat plate into a rectangular shape, and a screw 5 is screwed into a screw hole 9 formed on the upper surface of the clamp 4. The clamp 4 is fixedly attached to the housing 1 side. The inner bottom surface of the clamp 4 is disposed at a position having substantially the same height as the lowermost end of the wire insertion port 8, and the tip of the connecting piece 2b of the contact 3 is at least the uppermost end of the wire insertion port 8. The electric wire 10 inserted through the electric wire insertion port 8 is inserted between the connection piece 3b and the inner bottom surface of the clamp 4 so that the electric wire 10 is located above the portion.

At the time of connecting the electric wire 10, the electric wire 10 from which the core wire 10a has been exposed to expose the core wire 10a is inserted into the case through the electric wire insertion port 8 and then through a screw tightening hole 7 formed on the upper surface of the housing 1 with a tool such as a screwdriver. When the screw 5 is tightened, the connecting piece 3b of the contact 3 is pushed down by the tip of the screw 5 as shown in FIG. 3 (b), and the electric wire 10 is pressed between the inner bottom surface of the clamp 4 and the connecting piece 3b. Then, the electric wire 10 is connected to the connector.

Hereinafter, the connecting piece 3b of the contact 3 which is a feature of this embodiment will be described. In the connector of the present embodiment, as shown in FIG. 1, the portion of the connecting piece 3b where the tip of the screw 5 abuts is a flat plate-shaped flat portion 3c, and both end portions of the flat portion 3c in the inserting direction of the core wire 10a of the electric wire 10 are arranged. A pair of curved portions 3d is formed on the curved portion 3a so as to project toward a portion facing the clamp 4. When the connecting piece 3b is formed in such a shape, even when the core wire of the multi-core electric wire is dislocated due to a temperature change over time, the flatness 3c of the curved portion 3d follows the contact pressure of the flat portion 3c. It is possible to reduce the drop, so it is difficult to make loose contact.

By the way, with the above-mentioned structure, there is a problem that the force applied to the electric wire 10 is directly applied to the pressure contact portion between the connection piece 3b and the clamp 4. Therefore, in order to improve this point, as shown in FIG. 4, the tip of the connecting piece 3b of the contact 3 is formed in a wavy shape, and the extending piece 4a extending from the lower portion of the clamp 4 in the insertion direction of the electric wire 10 is formed. Then, at the tip of the extending piece 4a, a protrusion 4b facing the protrusion protruding downward of the corrugated portion 3e of the contact 3 is formed.
Has been formed. As shown in FIG. 5, the cover 2 is formed with a contact piece 2a with which the base of the corrugated portion 3e of the connection piece 3b abuts. Here, a space is appropriately formed between the tip of the corrugated portion 3e and the contact piece 2a so that the difference in the diameter of the covering portion 10b of the electric wire 10 can be absorbed. However,
In this connector, the clamp 4 is not fixed, but the screw 5 side is fixed, and when the screw 5 is tightened, the clamp 4 moves upward.

When the screw 5 is tightened in this connector, the clamp 4 moves upward in accordance with the screw tightened state, and FIG.
As shown in FIG. 3, the core wire 10a of the electric wire 10 is clamped between the connection piece 3b and the inner bottom surface of the clamp 4 by pressure. Then, at this time, the covering portion 10b of the electric wire 10 is sandwiched between the protrusion of the corrugated portion 3e of the connecting piece 3b and the protrusion 4b of the extending piece 4a. For this reason, the wires
Even if an external force is applied to 10, the external force does not act on the portion of the core wire 10a that is sandwiched by pressure between the connection piece 3b and the clamp 4.

[Advantages of the Invention] As described above, the present invention uses a flat plate-shaped flat portion as a screw contact portion in a portion of a connection piece of a contact made of an elastic material facing the clamp, and a flat surface in the insertion direction of the core wire of the wire. Since a pair of curved parts that are curved so as to project to the clamp side are formed at both end parts of the part and facing the clamp, even if the core wire of the electric wire separates due to temperature change over time, the connecting piece Due to the springiness of the contact piece, the connection piece follows, and the drop in contact pressure can be reduced, which is advantageous in that loose contact is less likely to occur.

[Brief description of drawings]

FIG. 1 is a side view of a contact according to an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view of a connector including the same as above, FIG. 3 (a),
(B) is an explanatory view of an electric wire connecting method, FIG. 4 is a perspective view of a contact and a clamp having a structure for further improving the connection reliability, and FIGS. 5 (a) and (b) are explanatory drawings of the electric wire connecting method. FIG. 6 is a side view of a conventional contact, and FIG. 7 is a side view of another conventional contact. 3 is a contact, 3b is a connecting piece, 3c is a flat surface portion, 3d is a curved portion, 4 is a clamp, 5 is a screw, 10 is an electric wire, and 10a is a core wire.

Claims (1)

[Scope of utility model registration request] 1. A contact made of an elastic material that comes into pressure contact with a connection pin of a connector on a side to be fitted, a frame-shaped clamp into which a connection piece made of an elastic material extended from the contact is inserted, and tightened to the clamp. A screw that presses the connecting piece by clamping and clamps the core wire of the electric wire between the clamp and the clamp, and the contact portion of the screw in the connecting piece of the contact of the contact is a flat plate-shaped portion. A connector comprising a pair of curved portions that are curved so as to project toward the clamp side at both end portions of the flat portion in the insertion direction of the core wire of the electric wire and at a portion facing the clamp.