Door operating apparatus

Electricity: motive power systems – Automatic and/or with time-delay means – Speed or rate-of-movement

Patent

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Details

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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