Window balance

Details Window balance Window balance

2005-09-27

2005-09-27

Sandy, Robert J. (Department: 3677)

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

Sash balances

Spring

C049S445000

Reexamination Certificate

active

06948215

ABSTRACT:
A threaded follower mounted on a spiral rod is attached to the first end of a torsion spring, the second end of the torsion spring being connected to a window sash, one end of the spiral rod being attached to a window frame by a gear box that prevents rotation of the spiral rod unless the gear box receives externally provided rotational force by which it then rotates the spiral rod.

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patent: 2262123 (1993-06-01), None
patent: 2001055861 (2001-02-01), None

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