Torque cancelling, torque type window sash balance

Details Torque cancelling, torque type window sash balance Torque cancelling, torque type window sash balance

1981-04-20

1984-01-03

Silverberg, Fred

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

Sash balances

Spring

16DIG36, 49445, E05D 1312

Patent

active

044235364

ABSTRACT:
A pair of oppositely wound torsion springs and a pair of oppositely wound spiral ribbon actuators therefor are provided in a unitary construction as a window sash balance. There are torques developed between each of the spiral ribbon actuators and its respective spring. The two torques are in opposite directions and cancel each other. This eliminates torque which would otherwise, when applied to the window sash, increase the friction between the sash and the window jam and make difficult the operation of tilt type and removable sashes.

REFERENCES:
patent: 1771997 (1930-08-01), Fast
patent: 1864745 (1932-06-01), Larson
patent: 2041646 (1936-05-01), Larson
patent: 2122576 (1938-07-01), Larson
patent: 2577953 (1951-12-01), De Vires et al.
patent: 2635282 (1953-04-01), Trammell, Sr. et al.
patent: 3220064 (1965-11-01), Nobes
patent: 3521320 (1970-07-01), Perry

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