Verifone Gmbh

Michael Ostermöller

Thomas Wahl

Ottmar Möller

Torsten Ide

A device for monitoring a space by changing a sequence of a serial interconnection of closing contacts, in particular of cover switches in a security housing, having a series circuit variation apparatus, a security cover, at least two closing contacts, and a protective circuit, wherein said at least two closing contacts each have an open, electrically nonconductive state and a closed, electrically conductive state, wherein said security cover is set up to put each of said at least two closing contacts in a closed, electrically conductive state, wherein said protective circuit is set up to detect an opening of at least one of said at least two closing contacts, wherein said series circuit variation apparatus serially interconnects said at least two closing contacts, wherein the sequence of the serial interconnection of said at least two closing contacts can be changed by said series circuit variation apparatus.

Device and method for monitoring an integrity of a series-connection of a plurality of switches

Device for monitoring a space by series-connected normally-open contacts, in particular cover interlock switches in a security enclosure

The invention relates to a console () and a safety console () having dual-stage functionality. The console () has a key () and a contact plate (). According to one exemplary embodiment, the key () has a dual-stage safety shutdown mat () on which electrically conductive layers () are located. The contact plate () has two contact arrangements having electrically conductive safety contact elements () and key contact elements (). The console () is configured to connect the electrically conductive safety contact elements () by means of the safety contact layer () in an inactive state, thus continuously monitoring the presence and active contact state of the key () via a safety switch (). In an active state, the key () is configured to also connect the key contact elements () via the key contact layer () on the safety shutdown mat () such that the activation can be registered by an evaluation circuit ().

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Bad Hersfeld, Germany

Michael Ostermöller