Power-assist door closer

Details Power-assist door closer Power-assist door closer

1990-03-27

1991-02-26

Kannan, Philip C.

Movable or removable closures

Initial manual displacement energizes motor drive; e.g.,...

49334, 49340, 16 58, E05F 1510

Patent

active

049951947

ABSTRACT:
An hydraulic door closer has a motor/pump component to assist opening the door by supplying oil under pressure to the closer cylinder. The component is activated by a switch sensitive to the turning of the closer pinion shaft as the door is moved out of its frame. Further, the distance which the door must move until the switch activates the motor/pump component is adjustable. The hydraulic circuitry is conveniently embodied in a single manifold block.

REFERENCES:
patent: 2549451 (1951-04-01), Gossling
patent: 2639142 (1953-05-01), Morgan et al.
patent: 2800323 (1957-07-01), West et al.
patent: 2910290 (1959-10-01), Buchanan
patent: 3874117 (1975-04-01), Boehm
patent: 3936977 (1976-02-01), Runft et al.
patent: 3948000 (1976-04-01), Pedersen
patent: 4429490 (1984-02-01), Zunkel
patent: 4793023 (1988-12-01), Simpson et al.

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