Apparatus for preventing a motor rolling door from falling

Details Apparatus for preventing a motor rolling door from falling Apparatus for preventing a motor rolling door from falling

1996-08-30

1998-01-13

Mah, Chuck

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Closure checks

16DIG10, 16188, 16310, 49322, E05F 502

Patent

active

057065527

ABSTRACT:
An apparatus for preventing a motor rolling door from falling includes a wedge shaped sliding plate located at one side of a driven sprocket, which is biased away from the driven sprocket by means of two actuating rods forced by two springs. Two rollers at the outer ends of two actuating rods push against the inner surfaces of the upper and lower stringers of the drive chain to keep the sliding plate away from the driven sprocket. When the drive chain is broken, the two actuating rods extend outward due to the action of the springs, and bias the wedge sliding plate toward the driven sprocket to engage with the driven sprocket, so that the rolling door is prevented from falling by its own weight.

REFERENCES:
patent: 2084677 (1937-06-01), Gerken
patent: 4727919 (1988-03-01), Kraeutler
patent: 5253693 (1993-10-01), Marlatt et al.
patent: 5291686 (1994-03-01), Sears et al.

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