Coupling for spiral counterbalance

Details Coupling for spiral counterbalance Coupling for spiral counterbalance

1996-07-10

1997-12-09

Mah, Chuck Y.

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

Sash balances

Spring

49445, E05D 1300, E05F 100

Patent

active

056946643

ABSTRACT:
A coupling between a twisted rod and a torsion spring of a spiral counterbalance is found to be subject to deformation against the twisted rod from compressive force of the grip of the terminal convolutions of the torsion spring. This problem is solved by using a metal cylinder in the rotation transmission sleeve of the coupling to resist the compressive force and prevent deformation so that the twisted rod can move freely within the coupling. This solution also allows the use of a stronger torsion spring to exert a larger counterbalance force.

REFERENCES:
patent: 2477069 (1949-07-01), Larson
patent: 2580705 (1952-01-01), Tappan
patent: 2774100 (1956-12-01), Larson et al.
patent: 2890480 (1959-06-01), Gregg et al.
patent: 2929095 (1960-03-01), Nobes
patent: 3478384 (1969-11-01), Skolnik
patent: 5152032 (1992-10-01), Davis et al.
patent: 5267416 (1993-12-01), Davis
patent: 5383303 (1995-01-01), Nakamishi et al.

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