Industrial hydraulic door operator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Jul 17, 1990
Grant Date -
N/A
app pub date -
Jun 17, 1988
filing date -
Jun 17, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A door operator having a fluid drive motor and a manual override. The bidirectional hydraulic motor connects to a drive shaft through a power train including a shiftable --quill--type manual clutch mechanism which allows an alternate connection of the drive shaft to a manually-operated wheel. When the cable which shifts the clutch for manual drive is pulled, a switch disables the control for the hydraulic motor. When the motor is not provided with pressured fluid from the pump a hydraulic brake engages the motor.
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