Window balance

Details Window balance Window balance

1998-06-30

2000-09-12

Mah, Chuck Y.

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

Sash balances

Spring

49445, E05F 300

Patent

active

061158844

ABSTRACT:
In a counterbalance having a torsion spring which is torqued by a thread follower rotated by axially reciprocal movement of a spiral rod through the follower and into the torsion spring, the pitch of the spiral thread changes continuously, smoothly and consistently at a nonlinear rate according to an equation.

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