Movable or removable closures – Radiant energy control
Patent
1983-11-28
1986-01-21
Downey, Kenneth
Movable or removable closures
Radiant energy control
49 28, 49264, 250221, E05F 1520
Patent
active
045650292
ABSTRACT:
An automatic door installation with four traffic sensors mounted on the door jambs on opposite sides of the doorway opening and having radiant energy emitters and reflected energy receivers for sensing doorway traffic. Two sensors are employed to cover the exit or swing side of the doorway, a threshold sensor is employed to cover the threshold area and an entrance sensor is employed to cover the entrance side of the doorway. The entrance and two exit sensors each have a plurality of radiant energy emitters with angularly spaced beam axes to provide broad coverage areas intersecting the traffic path of travel. The emitters of the exit and threshold sensors are selectively deactivated as the door is swung between its open and closed positions to avoid sensing the door. The emitters of all four sensors are pulsed in a predetermined sequence and the sensor receivers are timely activated to receive reflected radiant energy from the respective emitter(s) only.
REFERENCES:
patent: 3852592 (1974-12-01), Scoville et al.
patent: 3857466 (1974-12-01), Berkovitz et al.
patent: 4272921 (1981-06-01), Jorgensen
patent: 4514625 (1985-04-01), Heiland
Cirkot David M.
Kornbrekke Henning N.
Ranaudo Anthony R.
Downey Kenneth
The Stanley Works
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