JPH031878Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to a contactor mainly used in small electromagnetic relays (hereinafter referred to as relays).

[Prior art and its problems]

It is well known that many relays are being used as input/output interfaces between electronic logic circuits and high-power circuits as control systems become more electronic. In such applications, it is particularly required that the stray capacitance between the relay contacts and the excitation coil be small. This is because it is possible to suppress the transfer of noise surge voltage to the relay.One way to reduce the capacitance between this contact and the exciting coil is to separate the contact part and the electromagnet part that has the exciting coil, that is, to increase the distance in the longitudinal direction of the relay. The best thing to do is to put it in place and it is already being done. For this reason, the contacts used in the contact parts of conventional relays for this type of application are long and thin plate-shaped, and it is inevitable that relays configured by arranging this contact and the aforementioned electromagnet part in the longitudinal direction will be used. It has a large longitudinal dimension, which makes it unsuitable for mounting on a printed board. If the contactor is simply shortened, the spring constant of the leaf spring increases, which places a corresponding burden on the electromagnet whose load is the contactor, resulting in an increase in the size of the electromagnet. Further, there is a limit to reducing the thickness of the leaf spring in order to reduce the spring constant due to the allowable stress of the material, and it has been difficult to reduce the length of the contact.

For this reason, a shortened contact shown in FIG. 2 was proposed, and this contact consists of a leaf spring 1 bent into a wave shape and a contact integrated into one end of the leaf spring 1. 2 and a terminal 4 integrated with the other end of the leaf spring 1 via a connecting member 3. However, since the leaf spring 1 is formed in a wave shape, the contact 2 and the connecting member There were variations in the dimensions between the two, and there was a drawback that it took a lot of time to assemble and adjust.

[Purpose of invention]

The object of this invention is to provide a contact that eliminates the above-mentioned conventional drawbacks and contributes to the miniaturization of relays without increasing stray capacitance or impairing performance and assemblability.

[Key points of the idea]

The main point of this invention is to achieve the above-mentioned purpose by using a terminal fitting made of a rectangular conductor having a U-shaped recess near the tip, and an E The present invention is composed of a contact spring formed in the shape of a letter and a contact point integrated into the central leg of the contact spring, in order to obtain a shortened contact element with an appropriate spring constant.

[Example of idea]

FIG. 1 shows a perspective view of an embodiment of a contactor according to this invention, and in the figure, this contactor is composed of a terminal fitting 4, a contact spring 5, and a contact point 6.
The terminal fitting 4 is made of a rectangular conductor and has a U-shaped recess 4a near its tip, and the contact spring 5 is formed in an E-shape and has leg pieces 5a and 5b on both sides of the terminal fitting 4.
A contact point 6 is integrated near the leg end of the central leg piece 5C, bridging both end legs of the recess 4a. Note that caulking or spot welding is preferable for bridging the recess 4a of terminal fitting 4 on both side leg pieces 5a and 5b of contact spring 5, and caulking or spot brazing is preferable for integrating center leg piece 5c and contact point 6. . And the dimension L ₁ from the bridge point of both side leg pieces 5a, 5b of the contact spring 5 to the bottom piece 5d
The total value of the dimension _L2 from the tip of the center leg piece 5c to the bottom piece 5d is the effective spring length,
The terminal fitting 4 is selected so as to have an appropriate spring constant when the terminal fitting 4 is driven in the direction of the arrow P and comes into contact with a fixed contact (not shown), and a recess 4a is provided in the terminal fitting 4 as a relief against deflection. . Therefore, even though the contact spring 5 is apparently short, it is possible to use the contact without putting an undue burden on the electromagnet, and with a sufficient stress margin for the allowable stress of the material. becomes.

[Effect of idea]

According to this invention, the contact spring is formed into an E-shape, and the contact is attached to the central leg piece, and both leg pieces are attached to the terminal fitting, thereby making it possible to provide a contact with a short length and an appropriate spring constant. can.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a contactor according to this invention, and FIG. 2 is a perspective view showing an example of a conventional contactor. 4...Terminal fitting, 4a...Recess, 5...Contact spring, 5a, 5b...Both side leg pieces, 5c...Central leg piece, 6...Contact point.

Claims (1)

[Scope of utility model registration request] A terminal fitting made of a rectangular conductor having a U-shaped recess near the tip, a contact spring formed in an E-shape bridging both leg ends of the recess of the terminal fitting with both leg pieces, and a contact spring of the contact spring. A contact element comprising a contact point integrated into a central leg piece.