Non-backdriving actuator for opening and closing a window sash

Details Non-backdriving actuator for opening and closing a window sash Non-backdriving actuator for opening and closing a window sash

1988-11-10

1989-08-29

Kannan, Philip C.

Movable or removable closures

Operator interrelated with closure latch release

49341, 49394, E05F 1102, E05F 1124

Patent

active

048604933

ABSTRACT:
A shaft of a window actuator is operable to open and close a casement window sash when the shaft is rotated either by a hand crank or by a motor from inside of the premises. The shaft is automatically locked against rotation if a backdriving force is applied to the actuator from outside the premises. This prevents an open sash from being buffeted by wind and from being pulled open further by a potential intruder.

REFERENCES:
patent: 391678 (1888-10-01), Benner
patent: 891326 (1908-06-01), Chegwidden et al.
patent: 3474572 (1969-10-01), Rothemund
patent: 3911623 (1975-10-01), Walter
patent: 4553656 (1985-11-01), Lense

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