Patent · US Expired

Push-pull actuator for key switches

US4902865A · kind A · utility

2Cited by

3References

5Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Herbert Muller · Bischofswerda, DE
Gerhardt Sehnke · Sulzbach-Rosenberg, DE

Key dates

Filing date	Nov 16, 1988
Grant date	Feb 20, 1990
Priority date	—
Expiry date	Nov 16, 2008

Classification

Technology area (CPC H)Electricity
CPC primaryH01H2003/024
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to a push-pull actuator for key switches with a mushroom knob (1) which is loaded by a restoring force and is supported longitudinally movable. This mushroom knob (1) is separated from the actuating plunger. This actuating plunger is spring-loaded in the switching direction and is locked in the operating position by rocker levers (13). The locking is cancelled by a relative motion between the mushroom knob (1) and the actuating plunger (6) by the sliding of inclined surfaces (23) at the edges of the rocker levers (13) so that the actuating plunger is moved into the off position by the spring (20). In the off position, the rocker levers (13) with the back sides (19) are brought into engagement with the end faces (18) of the rocker levers.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.