Mechanism for constant balance

Details Mechanism for constant balance Mechanism for constant balance

1997-02-05

1999-12-21

Purol, David M.

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

With mounting or supporting means

160170R, E05F 1100

Patent

active

060035846

ABSTRACT:
Constant balance of a varying load, particularly a window shade or blind, is maintained by providing a lifting force, preferably from a spring, through a mediating mechanism including a variable pitch screw arrangement, such that the mechanical advantage of the mediating mechanism changes to allow the continuously decreasing spring force to apply an appropriate lifting force at all times. The variable pitch screw preferably takes the form of a twisted bar.

REFERENCES:
patent: 926911 (1909-07-01), Thompson
patent: 2032951 (1936-03-01), Pixley
patent: 2055511 (1936-09-01), Twiss
patent: 2250106 (1941-07-01), Lorentzen
patent: 2350286 (1944-05-01), Michelman
patent: 2543711 (1951-02-01), Schultz
patent: 5078198 (1992-01-01), Tedeschi
patent: 5133399 (1992-07-01), Hlller et al.
patent: 5437324 (1995-08-01), Sternquist
patent: 5531257 (1996-07-01), Kuhar

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