Movable or removable closures – Safety means responsive to obstruction to closure – Closure drive stopping or reversal
Patent
1985-01-18
1986-11-11
Aschenbrenner, Peter A.
Movable or removable closures
Safety means responsive to obstruction to closure
Closure drive stopping or reversal
49 25, 187 52R, E05F 1520
Patent
active
046214526
ABSTRACT:
A sliding door having a safety light beam which travels with and ahead of a closing door. Interruption of the safety light beam by an object in the path of the closing door activates a door control to stop or reverse the closure of the door. A stationary transmitter projects a beam of pulsed infrared light to a convex mirror mounted on the door. The mirror reflects the projected beam ahead of the closing door in a direction transverse to the direction of closure. In one embodiment a plurality of receiver assemblies with overlapping receiving sectors monitor the door closure path and sense the presence of the moving safety beam. Interruption of the safety light beam is detected in a control unit connected to a unit which controls a motor that moves the door. In another embodiment, plane mirrors positioned on an arm mounted on, and projecting ahead of the door, establish and reflect safety beams to corresponding receiver assemblies.
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