Safety mechanism for power operated door

Details Safety mechanism for power operated door Safety mechanism for power operated door

1987-07-14

1988-06-14

Kannan, Philip C.

Movable or removable closures

Safety means responsive to obstruction to closure

Closure drive stopping or reversal

49 14, 49199, 49358, E05F 1510, E05F 1100

Patent

active

047502940

ABSTRACT:
A safety mechanism for a power operated door activates limit switches for stopping an electric motor or reverses it's polarity. The safety mechanism is more compact than existing types of mechanisms and is suitable for friction drive roller garage door openers. Furthermore, indicator lights are provided that indicates exactly when a limit switch is tripped enabling field adjustment of the safety mechanism to suit specific pressures to either stop or reverse the door. The mechanism includes a worm slidably mounted on a motor drive shaft, with a cage structure around the worm to slide with the worm, two compression springs supporting the cage structure in a neutral position, an actuator member on the cage structure to activate limit switches when the cage structure slides in either direction, and adjustment screws to vary the position of the limit switches, each limit switch having an indicator light indicating when the switch is activated.

REFERENCES:
patent: 2925267 (1960-02-01), Volf
patent: 3202415 (1965-08-01), Lodge
patent: 3284952 (1966-11-01), Lodge
patent: 3633313 (1972-01-01), Lafontaine
patent: 3691684 (1972-09-01), Boneck
patent: 3797171 (1974-03-01), Farmer
patent: 4107877 (1978-08-01), Lee
patent: 4533905 (1985-08-01), Leivenzon et al.
patent: 4625456 (1986-12-01), Lafontaine

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