Electricity: motive power systems – Automatic and/or with time-delay means – Speed or rate-of-movement
Patent
1977-09-27
1980-03-04
Smith, Jr., David
Electricity: motive power systems
Automatic and/or with time-delay means
Speed or rate-of-movement
318466, 318466, H02P 300
Patent
active
041919157
ABSTRACT:
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.
REFERENCES:
patent: 2713138 (1955-07-01), Lanfers et al.
Montgomery Ward Residential Automatic Garage Door Opener Owners Manuel, 9-70.
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