Hydraulic door operator
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United States of America Patent
Stats
-
Nov 13, 2001
Grant Date -
N/A
app pub date -
Jun 18, 1999
filing date -
Jun 18, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic door opener provides a simplified mechanism for two-speed operation and for controlling the release of a brake that normally holds the door against movement. The mechanism includes a bypass valve between a fluid reservoir feeding the pump and the close control line running between the pump and the hydraulic motor. Fluid flow is directed from the close control line so that the door can be closed at slower rate than it is opened using a single speed motor. A brake control valve releases the brake when the control lines are pressurized.
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