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Contactless safety switch

  • US 6,212,052 B1
  • Filed: 09/02/1999
  • Issued: 04/03/2001
  • Est. Priority Date: 09/05/1998
  • Status: Expired due to Term
First Claim
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1. 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; and

    a 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; and

    wherein 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.

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