Cordless, balanced venetian blind or shade with consistent varia

Details Cordless, balanced venetian blind or shade with consistent varia Cordless, balanced venetian blind or shade with consistent varia

1994-04-06

1996-01-09

Purol, David M.

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

Venetian blind type

160192, 185 39, 185 45, E06B 930

Patent

active

054821002

ABSTRACT:
A cordless, balanced venetian blind or shade with a constant variable spring motor includes conventional window covering components without the outside hanging lifting cords or cord locking mechanisms. One or more constant variable force spring motors are employed, preferably comprising springs which vary in thickness or in width along their length as they are wound around storage drums. A cord spool, in the preferred embodiment, is coupled to one of the spring drums to serve to wind the cords to cause the blind to be raised or lowered, simply by manipulation of the bottom bar of the blind system. Due to the difference in thickness or width of the spring, the system compensates for the increasing weight on the cords as the window covering is raised and for the decreasing weight as it is lowered.

REFERENCES:
patent: 13251 (1855-07-01), Bixler
patent: 2266160 (1941-12-01), Burns
patent: 2276716 (1942-03-01), Cardona
patent: 2324536 (1943-07-01), Pratt
patent: 2390826 (1945-12-01), Cohn
patent: 2420301 (1947-05-01), Cusumano
patent: 2687769 (1954-08-01), Gershuny
patent: 2824608 (1958-02-01), Etten
patent: 3194343 (1965-07-01), Sindlinger
patent: 3358612 (1967-12-01), Bleuer
patent: 3756585 (1973-09-01), Mihalcheon
patent: 5133399 (1992-07-01), Hiller et al.
patent: 5157808 (1992-10-01), Sterner
patent: 5170830 (1992-12-01), Coslett
patent: 5363898 (1994-11-01), Sprague

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