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Sensor system

  • US 20030047670A1
  • Filed: 09/13/2001
  • Published: 03/13/2003
  • Est. Priority Date: 09/13/2001
  • Status: Active Grant
First Claim
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1. A sensor system for controlling movement of a door moving in a first direction by actuation of a device, the sensor system comprising:

  • (a) an elongated generally flexible tubular sheath secured to a leading edge of the door, the sheath having a longitudinal axis generally parallel to the leading edge of the door, and including an elongated hollow cavity extending generally parallel to the longitudinal axis, a first open end and a second open end;

    (b) an infrared transmitter proximate the first end of the sheath for transmitting an infrared signal toward the second end of the sheath through the cavity;

    (c) an infrared receiver proximate the second end of the sheath in alignment with the infrared transmitter for detecting the infrared signal at the second end, and for generating an output signal upon detecting an absence of the infrared signal when the passage of the infrared signal through the cavity is blocked; and

    (d) a control circuit coupled to the infrared receiver for receiving the output signal from the infrared receiver and for sending a failure signal to the device only if no infrared signal is received by the receiver for a predetermined time period.

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