Preh Elektrofeinmechanische Werke Jakob Preh Nachf Gmbh & Co.

Preh-werke Gmbh Co. Kg

Edgar Maisch

Karl-Heinz Bauer

Gerold Eckert

Wolfgang Labude

Anton R Uttiger

A push button switch (3) encounters, during a stroke of a push rod (6) thereof, a pressure point (D), a switching (contact-making) movement, and a return tension. A one-piece spring element (16) is provided for achieving this with an uncomplicated structure, with a short stroke, and with a reliable contact once the pressure point has been overcome. The one-piece spring element has, between a contact arm (26) and a return arm (21), hairpin-shaped bent guide legs (17, 18). A sloping step (24) formed on at least one of the guide legs creates the pressure point.

Push switch

A pushbutton switch comprising a housing within which a pushbutton can move ith respect to a housing socket is described. Within the housing is placed a switch plunger which moves longitudinally and can also pivot through a small angle. A contact bridge, which can be pivoted in an oversprung fashion between two fixed contacts, is disposed in the housing. The placement of the contact bridge is governed by a switch rocker, which is arranged in a hinged fashion in the housing. This allows the switch plunger and switch rocker to engage. The counterbearing for the contact bridge consists of a knife-edge bearing in the switch rocker. Between the switch plunger and the switch rocker is a return spring, arranged so that in the rest position of the pushbutton, the switch plunger occupies a pivoted position remote from the middle position. The cross motion of the switch plunger is halted, depending on the direction of motion of the pushbutton, by a constraining guide on each side.

Pushbutton switch

A key switch comprises a casing, at least one key slide guided in the cas against the force of a spring and at least one J-shaped leaf spring having a long spring arm and a short spring arm connected to the long arm by a curved intermediate part, the leaf spring being clamped to assume a unilateral curvature between two abutments, one fixed and the other moveable, the leaf spring having the free end of its long spring arm supported in a first abutment in the key slide and its curved intermediate part in a second abutment formed in a fixed contact member provided in the casing. For providing a minimum space the leaf spring is mounted parallel to the sliding direction in an elongated recess of the key slide.

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Bad Neustadt/Saale, Germany

Edgar Maisch