Movable or removable closures – Safety means responsive to obstruction to closure – Closure drive stopping or reversal
Patent
1977-09-19
1978-08-22
Kannan, Philip C.
Movable or removable closures
Safety means responsive to obstruction to closure
Closure drive stopping or reversal
49139, 49199, 49362, 192 67P, 192108, 192141, 192143, 192150, E05F 1510
Patent
active
041078772
ABSTRACT:
A garage door operator includes a drive screw, rotationally and longitudinally movable in a shuttle track or guide rail, and a screw-driven shuttle mounted on the track and connected to the door. A lever arm is attached to the screw at a rearward end thereof and is pivoted to the operator at one side of the screw. Another end of the lever arm, adjacent an opposite side of the screw, is operatively disposed with respect to control switches and is spring-loaded, whereby door engaged obstructions cause the rotating screw to move longitudinally, against the spring bias, and to actuate, through the lever arm, a switch for stopping or for reversing the operator motor. A sleeve coupling permits longitudinal screw movement with respect to the operator's motor, and is provided with means to permit continued motor operation, drivingly disengaged from the screw, upon control malfunction, in order to prevent damage or injury.
REFERENCES:
patent: 2751219 (1956-06-01), Dodge
patent: 3204170 (1965-08-01), Monks
patent: 3220718 (1965-11-01), Wikkerink
patent: 3858452 (1975-01-01), Gatland et al.
patent: 3996697 (1976-12-01), Bailey et al.
patent: 4018005 (1977-04-01), Harris
Clopay Corporation
Kannan Philip C.
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