Patent ID: 6212052
Filing Date: 2001-04-03
Classification: H03K

Abstract:
A contactless safety switch for detecting the shut position of a shutting part in relation to a closeable part, comprising:a switch unit, supplied with current by an electrical supply source on one of said parts; anda trip arranged on the other part and comprising a magnet;wherein said switch unit comprises a transmission circuit with a clock-signal generator and with a transmission coil;wherein said switch unit further comprises a receiver circuit connected to an evaluation unit and having at least one receiver coil; andwherein said switch unit also comprises a Hall sensor responding to the magnet;said trip comprising a trip coil which, in the shut position, is capable of being excited inductively by a transmission coil and exciting the receiver coil, whilst, in the shut position, the evaluation unit, after comparing the transmitted and received clock signals, triggers a clearance path when the Hall sensor is activated via the magnet.