Adjustable friction block and tackle window balance system

Details Adjustable friction block and tackle window balance system Adjustable friction block and tackle window balance system

1986-04-11

1987-04-07

Lin, Kuang Y.

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

Sash balances

Spring

254391, 16DIG16, E05F 100

Patent

active

046549285

ABSTRACT:
A block and tackle window sash balance system 10 has its friction made adjustable by a friction spring 20 and a cam 30 arranged for pressing spring 20 against a radial face of a pulley 15 in a high friction position and moving the spring clear of the pulley in a low friction position. Cam 30 is preferably accessible with a screwdriver for adjusting friction after the balance is installed in a window.

REFERENCES:
patent: 432137 (1890-07-01), Jenkins
patent: 514005 (1894-02-01), Howard
patent: 1642162 (1927-09-01), Londick
patent: 1654682 (1928-01-01), Dulczewski
patent: 1699267 (1929-01-01), Appleby
patent: 1762821 (1930-06-01), Kersting
patent: 3358404 (1967-12-01), Dinsmore
patent: 4517766 (1985-05-01), Haltof

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