JPH1040976A - Quick connecting terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a structure free of contact pressure fall, contact resistance increase, and temperature rise or body rigidity being loosened and cracked on the contrary, in a support shape of a combined portion when dimensional precision on the body inner wall and the terminal plate both ends is improved and dimensional change is generated on the both. SOLUTION: This terminal is composed of a plastic body 1 and a plastic cover 2. A pair of power wire insertion holes 3 and feed side wire insertion holes 4 are provided on a outer face of the plastic cover 2. A conductive metal based terminal plate 8 and a pair of chain-shaped spring 9 disposed adjacent to an inside of a terminal plate contact piece 8a are provided inside thereof. A wire contact portion 8c is provided at a root portion 8b of the terminal plate contact piece 8a, that is, at corners of a contact piece rise portion, and the combined face 1b is provided on an inner wall of the body 1 at a portion distant from the wire contact portion 8c and at an outer end portion of the terminal plate contact piece 8a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a quick connection terminal for connecting electric wires. The use of the quick connection terminal is to make connection in a short time by a simple method of inserting a bare part of an electric wire at the time of connection work. The connection is made from the power supply to the sender.

[0002]

2. Description of the Related Art As shown in FIG. 1, a conventional quick-connecting terminal has a structure in which a terminal plate made of a conductive metal and a resilient locking spring are placed inside a contact piece facing the terminal plate in a plastic body. It is. The principle of this connection is that when the exposed wire is inserted, it is pressed against the contact piece of the terminal plate by the locking spring and makes contact, and electricity is exposed from the exposed wire to the terminal plate and then to the other exposed wire via the terminal plate. It is electrically connected by flowing. However, the combination of a plastic body and a terminal plate made of conductive metal, and the contact pieces facing each other, are difficult to achieve dimensional accuracy because of the combination of different materials of plastic and metal. If the body is small, for example, when the body contracts due to the difference in thermal expansion coefficient, the contraction force acts on both ends of the terminal plate, so that the contact pressure of the wire connection part changes depending on the deformed part, so that the contact resistance changes, and the contact resistance is low In such a case, there is a problem that the temperature rise is high, or conversely, if the strength of the body is weak, there is a possibility of cracking.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks, to improve the dimensional accuracy of the inner wall of the body and both ends of the terminal board, and to improve the dimensional accuracy of both parts even when dimensional changes occur in both. It is an object of the present invention to provide a structure in which the contact shape does not decrease the contact pressure, increase the contact resistance, and increase the temperature of the wire connection portion, or, on the contrary, does not lose the strength of the body and crack.

[0004]

When the exposed portion of the electric wire is inserted, the electric wire is pressed against the contact piece of the terminal plate by the locking spring to make contact and be electrically connected. However, the plastic body and the terminal plate made of conductive metal are connected. , And the combination of the contact pieces facing each other are necessary for the performance as a connector, resulting in a combination of different materials of plastic and metal. Therefore, for example, when the body contracts due to the difference in thermal expansion coefficient, a contraction force acts on both ends of the terminal board.The point of application of this force is a point away from the part wrapping the wire contact part, and this part is The combination surface of the contact pieces is configured to absorb a dimensional change.

[0005]

[Function] When the power is supplied from the power source to the feed side, a temperature rise occurs with the power supply. Due to the difference in the coefficient of thermal expansion between plastic and metal, for example, when the body shrinks, the shrinking force is applied to both ends of the terminal plate. The point of action of this force is applied to a place away from the part enclosing the wire contact part, and this part is used as the combined surface of the body and the terminal plate contact piece. The piece deforms so as to cover the wire contact part. Therefore, the contact pressure does not decrease.

[0006]

An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 2 and 3, the exterior is composed of a plastic body 1 and a plastic cover 2. The cover 2 is fixed to the body 1 by a plurality of locking claw pieces 2a. Reference numeral 3 denotes a pair of power supply wire insertion holes, 4 denotes a feed-side wire insertion hole, 5 denotes a load-side wire insertion hole, and 6 denotes a ground wire insertion hole. Reference numeral 7 denotes a release button for releasing insertion of the electric wire. In FIG. 4, reference numeral 8 denotes a terminal plate made of a conductive metal, and contact pieces 8a, 9 and 10 facing each other are locking springs having elasticity, and are arranged as a pair adjacently inside the terminal piece 8a. 9 is a power supply side and 10 is a sending side. A locking portion 1a for regulating the movement of the locking springs 9, 10 is provided at the intermediate portion. It is provided as a wall of the body 1 as shown in the figure, or is formed by providing a bent portion on the terminal plate 8. Reference numeral 11 denotes a load-side leaf spring. The configuration on the power supply side, the feed side, and the load side has been described, but there is also a usage where the load side does not need to be provided. Usually, since it is a single-phase two-wire, two pieces of terminal boards are arranged in parallel. Reference numeral 1b denotes a combination surface which improves the dimensional accuracy of the inner wall of the body and both ends of the terminal plate, which is a main part of the present invention, and absorbs the size even when a dimensional change occurs in both. The main part is configured as shown in FIG. The lock spring 9 is constituted by a pressing piece 9a and a claw locking piece 9b.
The exposed portion of the electric wire is pressed against the terminal plate contact piece 8a by the claw piece 9b, and the claw piece 9b prevents the wire from coming off. As shown in FIG. 6, when the exposed portion of the electric wire is inserted into, for example, the power supply insertion hole 3 as shown in FIG. 6, the electric wire is pressed against the terminal plate contact piece 8a by the locking spring 9 to make contact. Electricity flows from the exposed portion of the electric wire to the terminal plate contact piece 8a, and then to another electric wire, for example, a feed-side electric wire via the terminal plate 8, thereby being electrically connected. The contact pressure is stable because it is pressed against the base 8b of the terminal plate contact piece 8a, that is, the corner of the contact piece rising portion. 7 to 10 illustrate the basic points of the present invention. FIG.
Shows a part of the conventional example corresponding to the present invention, and FIGS. 8 to 10 show application examples of the present invention. The common feature of the present invention resides in that the combined surface 1b of the inner wall of the body 1 and the outer end of the terminal plate contact piece 8a is provided at a position distant from the electric wire contact portion 8c. It is located at least on the side away from the center of the exposed wire diameter. Conversely, the inside of the center of the exposed wire diameter is a space 8d which escapes the combined surface. This method is shown in FIG.
b, and a projection 8e is provided on the terminal plate contact piece 8a in FIG.
Is provided, and the space 8d is formed as it is as a combination surface. In FIG. 10, the base 8b of the terminal plate contact piece 8a,
That is, the rounded shape 8f is provided so as to wrap the wire contact portion 8c from the corner of the contact piece rising portion. Thus, for example, when the body contracts, a contraction force acts on both ends of the terminal plate, but the point of action of this force acts on a portion distant from the portion surrounding the wire contact portion, and this portion is applied to the combined surface of the body and the terminal plate contact piece. Therefore, when a deforming force acts, the conductive metal terminal plate contact piece is deformed so as to surround the wire contact portion. Therefore, the contact pressure does not decrease. Since the body 1 is a molded plastic part, the inner wall of the body 1 has a slope due to a taper due to the die structure. When the terminal plate 8 is incorporated, the bottom surface becomes tight but the front side becomes loose. Although there was a problem that rattling was apt to occur and dimensional accuracy was not obtained, but in the case of the present invention, the width of the combination surface 1b is limited. And when the terminal plate 8 is assembled, it can be uniformly and accurately applied from the bottom surface to the near side. To summarize the present invention, a plastic body 1,
A pair of power supply wire insertion holes 3 and a feed-side wire insertion hole 4 are provided on the outer surface of the plastic cover 2. In a configuration in which a pair of locking springs 9 are arranged adjacent to each other, a wire contact portion 8c is provided at a root portion 8b of the terminal plate contact piece 8a, that is, at a corner portion of the contact piece rising portion, and is separated from the wire contact portion 8c. Characterized in that a combination surface 1b is provided on the inner wall of the body 1 and the outer end of the terminal plate contact piece 8a. The location away from the wire contact portion 8c is at least located on the side farther from the center of the exposed wire diameter, and conversely, the space inside the center of the exposed wire diameter is a space 8d that escapes the combined surface. .

[0007]

As described above, the terminal plate 8 has little backlash between the terminal plate 8 and the inner wall of the body 1 and has high dimensional accuracy. Furthermore,
When installed and energized from the power supply to the load side, a temperature rise occurs with energization, and due to the difference in the coefficient of thermal expansion between plastic and metal, for example, when the body 1 contracts, a contraction force acts on both ends of the terminal plate 8. The point of application of this force acts on a portion away from the wire contact portion, that is, on the combination surface 1b. When a deformation force acts, the conductive metal terminal plate contact piece is deformed so as to surround the wire contact portion. Therefore, the contact pressure does not decrease. On the other hand, there is no possibility that the strength of the wall surface of the body 1 is broken by the strength of the terminal plate 8. In terms of cost, there is an advantage that it is not necessary to increase the strength of the terminal plate 8 as in the related art, and the thickness can be reduced and the material cost can be reduced. Similarly, body 1 has terminal plate 8
Instead of overcoming the above problems, the two exhibit strength in an integrated manner, so that material costs can be reduced, and the practical effect is large in both performance and cost.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a conventional example. FIG.

FIG. 2 is an external perspective view of the embodiment.

FIG. 3 is a configuration diagram of an embodiment.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a perspective view of a main part of the terminal plate of the embodiment.

FIG. 6 is an inserted view of an exposed portion of the electric wire according to the embodiment.

FIG. 7 is a conventional terminal board combination diagram.

FIG. 8 is a combination diagram of a terminal plate according to the embodiment.

FIG. 9 is a combination diagram of a terminal plate according to another embodiment.

FIG. 10 is a terminal board combination diagram of an application example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 1b Combination surface 2 Cover 3 Power supply side wire insertion hole 4 Load side wire insertion hole 8 Terminal plate 8a Terminal plate contact piece 8c Wire contact portion 8d Space

Claims (1)

[Claims] 1. A pair of power supply wire insertion holes 3 and a feed-side wire insertion hole 4 are provided on the outer surface of a plastic body 1 and a plastic cover 2, and a conductive metal terminal plate 8 is provided on the inner side. In a configuration in which a pair of locking springs 9 are arranged adjacent to each other inside the piece 8a and the terminal plate contact piece 8a, the wire contact portion 8c is provided at the base 8b of the terminal plate contact piece 8a, that is, at the corner of the contact piece rising portion. A quick-connecting terminal, wherein a combination surface 1b is provided on an inner wall of the body 1 and an outer end portion of the terminal plate contact piece 8a at a location away from the electric wire contact portion 8c.