发明名称 Door operating apparatus
摘要 A reversible motor operates a vertically movable door through transmission means including a friction clutch. Control means receiving the output of a tachometer generator driven by the driven member of the friction clutch are arranged to switch off the motor automatically in response to a predetermined deviation downwards of the rate of rotation caused by an obstruction in the path of the door. The system may include means for automatically re-starting the motor in the opposite direction subsequent to a switching-off caused by an obstruction to the travel downwards of the door.
申请公布号 US4191915(A) 申请公布日期 1980.03.04
申请号 US19770836970 申请日期 1977.09.27
申请人 JOHANSSON, TRYGGVE J 发明人 JOHANSSON, TRYGGVE J
分类号 E05F15/00;E05F15/16;H02H7/085;H02H7/093;(IPC1-7):H02P3/00 主分类号 E05F15/00
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