Safety device for garage doors and the like

Details Safety device for garage doors and the like Safety device for garage doors and the like

1986-09-09

1987-10-06

Staab, Lawrence

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192148, F16D 5710, E05D 1700

Patent

active

046976760

ABSTRACT:
A safety device for garage doors wherein the door can be pulled down against the opposition of one or more torsion springs acting upon a horizontal shaft has a housing for a gear which is non-rotatably mounted on the shaft and whose peripheral teeth and tooth spaces are adjacent a set of recesses the the housing. A plastic casing which is biased by the torsion springs normally maintains in deformed condition at least one coil spring which reacts against the housing and tends to rotate the casing relative to the gear so that several ramps which are adjacent to discrete pockets of the casing expel from the recesses spherical blocking elements which normally extend partly into the recesses and partly into the adjacent pockets. This results in partial entry of blocking elements into the adjacent tooth spaces to thus hold the shaft against rotation relative to the housing in the event of breakage of the torsion springs.

REFERENCES:
patent: 838024 (1906-12-01), Hendricks
patent: 1867409 (1932-07-01), Juergens
patent: 1878333 (1932-08-01), Scott
patent: 1948082 (1934-02-01), Stangeland
patent: 2097242 (1937-10-01), Robinson
patent: 2171458 (1939-08-01), Swartz
patent: 2626027 (1953-01-01), Anderson
patent: 3129040 (1964-04-01), De Rose
patent: 4091900 (1978-05-01), Murteza

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