Patent ID: 6683296
Filing Date: 2004-01-27
Classification: E05F,E05Y,E06B

Abstract:
A sensor system for controlling movement of a door moving in a first direction by actuation of a device that controls movement of the door, 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 configured to transmit 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 and being configured to detect the infrared signal at the second ends and to generate 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 and configured to receive the output signal from the infrared receiver and to send a failure signal to the device only if no infrared signal is received by the receiver for a predetermined time period in excess of one pulse-width of time.