Door operator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 28, 1991
Grant Date -
N/A
app pub date -
May 10, 1990
filing date -
May 10, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An operator for moving a door between an open position and a closed position. The operator includes linkage for being attached to the door; a motor assembly having a drive shaft; and a drive train for coupling the drive shaft of the motor assembly to the linkage structure, the drive train includes a clutch for selectively disconnecting the linkage from the drive shaft of the motor assembly and a variable torque control assembly for varying the torque produced by the clutch.
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