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Apparatus for interrupting operation of a motor driven movable member upon contacting an obstacle

  • US 5,592,777 A
  • Filed: 09/26/1995
  • Issued: 01/14/1997
  • Est. Priority Date: 09/26/1994
  • Status: Expired due to Fees
First Claim
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1. Apparatus adopted to interrupt closing operation of a movable closing member driven by an electric motor in a motor vehicle, upon detection of an obstacle which obstructs such closing operation, said apparatus comprising:

  • a pressure-sensitive sensor strip which is arranged on a closing edge of said movable closing member, and which emits a signal when pressure is applied;

    an electronic control device for controlling said electric motor which drives the closing member, said electronic control device having a control input driven by a sensor signal derived from the signal from the sensor strip, for halting or reversing operation of said motor;

    a base station arranged on a stationary part of said vehicle, which generates an alternating electromagnetic field; and

    a responsive circuit arranged on said closing member and connected to receive said signal from said sensor strip, said responsive circuit being coupled by said electromagnetic field generated by said base station, and being driven by said signal from said sensor strip to modify said electromagnetic field as a function thereof;

    wherein said base station evaluates changes in the alternating electromagnetic field, and generates said sensor signal in response thereto.

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