Power-assist door closer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 26, 1991
Grant Date -
N/A
app pub date -
Mar 27, 1990
filing date -
Mar 27, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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