Movable or removable closures – Safety means responsive to obstruction to closure – Closure drive stopping or reversal
Patent
1979-06-08
1981-08-04
Downey, Kenneth
Movable or removable closures
Safety means responsive to obstruction to closure
Closure drive stopping or reversal
49199, 318266, E05F 1510
Patent
active
042814758
ABSTRACT:
A door opener has a housing in which is contained a small fractional-horsepower reversible motor whose output shaft is connected to a worm gear journaled in the apparatus and meshing with a main gear in turn connected to an output member constituted as a sprocket. A clutch is provided between the main gear and the sprocket for disconnecting the two when rotation of the output member is resisted with a torque exceeding a given limit torque. A step-down transmission is connected between this output member and a control disk that carries opening and closing stops that are respectively engageable with opening and closing switches of an electrical control circuit. Thus the angular position of the control disk is directly related to the position of a door connected to the output member. A switch is provided which is actuated whenever the torque exerted between the motor and the worm exceeds a predetermined limit, and serves to reverse the displacement direction of the door in this case. Thus in the event the door strikes an object it will automatically reverse.
REFERENCES:
patent: 2568808 (1951-09-01), Johanson
patent: 3733747 (1973-05-01), Fox et al.
Downey Kenneth
Ross Karl F.
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