Abstract: In a system for access control of battery-operated, electro-mechanical locks, each containing a radio module, at least two access points for wireless communication with the radio modules are provided. The access points receive identification signals that include an identifier of a respective lock and are produced by the radio modules. The access points further detect simultaneously a parameter of the received identification signal. The identification signal and the detected parameter of the received identification signal are conducted to an evaluation unit formed on one of the access points. The evaluation unit is connected with a control unit. The identification signal received by multiple access points and transmitted by a radio module is conducted only once to the control unit. It can be determined via which of the access points an operating signal produced by the superordinate control unit for the lock is transmitted to the radio module of the lock.

Abstract: The invention relates to a bi-stable electric switch comprising a spring (101) that is configured as a bi-stable snap-action spring and carries contact elements (114, 116) on the carrier strip (104) of the spring and comprising at least one drive element made from shape memory material per switch state for actuating the spring, the spring having a plate (110) that is rigidly fixed at one end (102) and that is subjected to a pressure in the direction of its linear extension and evades this by bulging towards one side into one of two stable final states, the regions of the spring in the stable final states taking up different lateral positions and the drive elements (118, 119) acting upon the free end of the plate and as a result of the tilting of free end (104) cause it to snap into the second stable final state.