Obstruction sensor for electro-mechanically operated garage door

Details Obstruction sensor for electro-mechanically operated garage door Obstruction sensor for electro-mechanically operated garage door

1979-08-30

1981-06-23

Downey, Kenneth

Movable or removable closures

Safety means responsive to obstruction to closure

Closure drive stopping or reversal

49199, E05F 1502

Patent

active

042742277

ABSTRACT:
An obstruction sensor for an electro-mechanically operated garage door which utilizes a bracket for supporting one end of the trolley that carries the door and which is driven by the motor either through a chain or worm and wherein an obstruction encountered by the door will cause the rail to move relative to a fixed bracket thus causing a reversing switch to be energized due to relative motion between the fixed bracket and the rail which will cause the motor driving circuit to reverse the motor thus causing the door to move away from the obstruction.

REFERENCES:
patent: 1258439 (1918-03-01), Ogden
patent: 1558886 (1925-10-01), Hynes
patent: 1959292 (1934-05-01), Morris
patent: 2803454 (1957-08-01), Tatro
patent: 2826658 (1958-03-01), Jackson
patent: 3289350 (1966-12-01), Moody
patent: 3439727 (1969-04-01), Perl
patent: 3625328 (1971-12-01), Carli
patent: 3719005 (1973-03-01), Carli
patent: 3728605 (1973-04-01), Purtilo
patent: 3851125 (1974-11-01), Deming et al.
patent: 3996697 (1976-12-01), Bailey et al.

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