Alps Electric Co., Ltd.

Toshihisa Hirata

Akira Niinuma

Teiichi Miura

Hidenori Nagai

Kengo Shibuya

A spring-return switch comprises: a case; a common contact embedded in the inner surface of one of the opposite side walls of the case; a transfer contact embedded in the inner surface of the other side wall opposite to the common contact; a slider supported for vertical movement within the case and integrally provided with an operating rod; a movable contact held by the slider and having a base portion held by the slider, a first contact arm in continuous contact with the common contact and a second contact arm to be brought into contact with or to be separated from the transfer contact; and a return spring biasing the slider upward so that the slider is pressed resiliently against the inner surface of the upper wall of the case. The operating rod is dislocated from the center of the slider toward the transfer contact so that most part of pressure applied to the operating rod to depress the slider is exerted on the second contact arm of the movable contact.

Spring-return switch

A telephone line-switching device comprises first and second switches that interlock and a lock plate extending between the two switches. The push member of the first switch has a cam with which the lock plate usually engages. The push member of the second switch has an inclined portion on which the lock plate always bears. As the push member of the second switch is depressed, the inclined portion horizontally moves the lock plate, permitting the lock plate to disengage from the cam to release the first switch.

Telephone line-switching device

An auto-return type push switch is provided with a casing and a cover plate for covering the open face of the casing, and a slide member accommodated movably in the casing which has a lug projecting outside the case through the hole of the cover plate. A pair of fixed electrodes are erected on the bottom surface of the casing, and a clip-shaped movable contact segment accommodated in the cylinder portion of the slide member is contactable with the fixed electrodes. A helical spring is provided between the collar portion of the slide member and the bottom surface of the casing so as to surround the cylinder portion, wherein one contact leaf of the movable contact segment is in contact with one of the fixed electrodes and the other contact leaf with the other of the fixed electrodes.

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Furukawa, Japan

Toshihisa Hirata