Movable or removable closures – Safety means responsive to obstruction to closure – Closure drive stopping or reversal
Patent
1979-07-13
1981-04-28
Kannan, Philip C.
Movable or removable closures
Safety means responsive to obstruction to closure
Closure drive stopping or reversal
91435, E05F 1502
Patent
active
042637465
ABSTRACT:
A safety reverse arrangement is disclosed for reversing the direction of the powered operation of a door upon encountering an obstacle during its opening and closing movement. The arrangement includes a piston fit within a vented cylinder, which is stroked by the opening and closing movement of the door, while a pair of air flow detector switches receive the resulting air outflow developed during stroking of the piston. The air flow detector switches are integrated with a control circuit for the door powering arrangement such that, after an initial short delay period, any interruption in the flow to the flow detector results in a reversing of the direction of the door movement. Such interruption of air flow occurs upon the door encountering an obstacle during its opening or closing movement.
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patent: 3916567 (1975-11-01), Daugirdas
patent: 3938282 (1976-02-01), Goyal
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Dudek Edward R.
Eller Donald G.
Eller Harry J.
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