Checking device for roller supported doors

Details Checking device for roller supported doors Checking device for roller supported doors

1997-12-19

1999-01-12

Redman, Jerry

Movable or removable closures

With means to vary opening span or speed during movement

49 15, 49425, 16 91, 16102, E05F 1500

Patent

active

058572902

ABSTRACT:
A check mechanism is provided to regulate door speed of a roller supported sliding door as the door is manually opened or closed. The check mechanism includes an idler arm assembly attached to a door hanger with an idler roller attached to the idler arm assembly. The check mechanism further includes a pivotable spring biased lever arm having two inclined ramp sections. As the door slides, the idler roller contacts the lever arm. The inclination of the ramp causes an increasing retardation force to be applied to the idler roller, thereby retarding the speed of the door. After the idler roller passes a point of maximum retarding force, the door becomes free wheeling until a second idler roller contacts the lever arm of a second checking mechanism which in turn slows the speed of the door.

REFERENCES:
patent: 1606049 (1926-11-01), Youngblood
patent: 2423129 (1947-07-01), Tobias
patent: 2526503 (1950-10-01), Raque
patent: 3378952 (1968-04-01), Bidelmay et al.
patent: 3406484 (1968-10-01), Atkey et al.
patent: 3431678 (1969-03-01), Stuart, et al.
patent: 4067144 (1978-01-01), Ogishi
patent: 4912878 (1990-04-01), Bently
patent: 5165142 (1992-11-01), Pilsbury

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