Window sash balance with tension and torsion spring

Details Window sash balance with tension and torsion spring Window sash balance with tension and torsion spring

1991-05-23

1992-10-06

Larson, Lowell A.

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

Sash balances

Spring

16DIG16, 49445, E05D 1300

Patent

active

051520320

ABSTRACT:
A spring balance for counteracting the weight of heavy window sashes includes both a torsion spring and a tension spring. The two springs are separated by a rigid tube. One end of each spring is connected to an end of the rigid tube. A spiral member engages a follower carried by the other end of the torsion spring and includes a stop along its length for engaging an anchor carried by the other end of the tension spring. The spiral member can be attached by conventional means to a shoe or other connection to the window sash.

REFERENCES:
patent: 2041646 (1936-05-01), Larson
patent: 2415614 (1947-02-01), Tappan
patent: 2477069 (1949-06-01), Larson
patent: 2580705 (1952-01-01), Tappan
patent: 2604655 (1952-06-01), Peremi
patent: 2793389 (1957-05-01), Larson
patent: 2943345 (1960-06-01), Ammerman
patent: 3271812 (1966-09-01), Skolnik
patent: 3286301 (1966-11-01), Skolnik
patent: 3844066 (1974-10-01), Nobes
patent: 4452012 (1984-06-01), Deal
patent: 4517766 (1985-05-01), Haltof
Instruction Sheet for Tilt/Takeout System: "Field Adjustment Procedures for Single or Tandem Balances"-Caldwell Manufacturing Company, Rochester, NY.

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