Extension spring-type assembly for raising sectional door

Details Extension spring-type assembly for raising sectional door Extension spring-type assembly for raising sectional door

1998-02-02

1999-08-03

Mah, Chuck Y.

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

Sash balances

Spring

16DIG1, 16401, 160191, 49200, E05D 1300

Patent

active

059308656

ABSTRACT:
The assembly comprises an extension spring anchored at one end to a winch mounted to the door opening frame. A double-grooved pulley is mounted on a plate secured to the free end of the spring. A fixed second double-grooved pulley is mounted to the door frame. A pair of cables are anchored at one end to the door frame and extend in parallel to pass around the two pulleys. After the second pulley, the cables separate and extend down to the bottom corners of the door, to which they are secured. Upon release of the door latch with the door down, the spring contracts and, through the first pulley, applies an equal pull to the two cables so that they move at the same rate, thereby raising the door smoothly.

REFERENCES:
patent: 1931166 (1933-10-01), McCloud
patent: 2041221 (1936-05-01), Brunst

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