Self-contained heavy duty constant force sliding sash counterbal

Details Self-contained heavy duty constant force sliding sash counterbal Self-contained heavy duty constant force sliding sash counterbal

1989-06-02

1990-06-26

Seidel, Richard K.

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

Sash balances

Spring

16197, 16DIG16, 16DIG31, 49445, 49446, E05F 116

Patent

active

049359878

ABSTRACT:
A self-contained heavy duty constant force sliding sash counterbalance assembly embodying a stacked plurality of coil springs each having a uniform coiling and recoiling force throughout all of the various coils irrespective of the individual coil spring positions of extension or contraction, wherein the counterbalance assembly structure is provided with an elongated U-shaped housing adapted to adjustably accommodate the addition or removal of individual spring elements as necessary in order to achieve the proper counterbalance effect for the weight of the particular sash to be supported so that over the raising and lowering range of that sash to which the counterbalance assembly is affixed, and at all adjustably set sash opening elevations and corresponding coil spring positions of extension and contraction therebetween, there is a substantially constantly uniform counterbalance force effect exerted on the sash.

REFERENCES:
patent: 2609193 (1952-09-01), Foster
patent: 2635282 (1953-04-01), Trammell
patent: 3358403 (1967-12-01), Dinsmore
patent: 3452480 (1969-07-01), Foster
patent: 3457865 (1969-11-01), Arnes
patent: 3992751 (1976-11-01), Foster et al.

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