Sliding door threshold sensor

Details Sliding door threshold sensor Sliding door threshold sensor

1987-05-11

1989-04-18

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250221, 49 25, 340545, E05F 1520

Patent

active

048230103

ABSTRACT:
A threshold safety sensor for a sliding door system employs infrared transmitters and a photo diode for detecting traffic at or near the threshold of a sliding door system. The transmitters are pulsed in a time spaced sequence. An input signal derived from the operate initiating signal of the automatic door operator is employed for enabling a latch. The latch sets a relay to a state for maintaining the doors in an open position when traffic is detected in the sensor detection zone.

REFERENCES:
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patent: 3852592 (1974-12-01), Scoville et al.
patent: 3857466 (1974-12-01), Berkovitz et al.
patent: 4207466 (1980-06-01), Drage et al.
patent: 4560912 (1985-12-01), Jonsson
patent: 4563625 (1986-01-01), Kornbrekke et al.
patent: 4565029 (1986-01-01), Kornbrekke et al.
patent: 4590410 (1986-05-01), Jonsson
patent: 4669218 (1987-06-01), Kornbrekke et al.
patent: 4698937 (1987-10-01), Kornbrekke et al.
patent: 4713545 (1987-12-01), Norrgren et al.

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