A switch includes two interacting contacts (1, 2) and a closing spring (5, 11, 15, 21) for moving the contacts into the closed position, an operating button which can be used to initiate a prestressing phase of the closing spring (5, 11, 15, 21), and a locking device (6) for locking the contacts (1,...http://www.google.de/patents/US6384356?utm_source=gb-gplus-sharePatent US6384356 - Switch with snap-action closure
