Window treatment safety clutch

Details Window treatment safety clutch Window treatment safety clutch

1998-09-08

2000-09-05

Johnson, Blair M.

Flexible or portable closure, partition, or panel

Roll type

With brake or stop

160319, 160170R, E06B 956

Patent

active

061128007

ABSTRACT:
A safety clutch is provided for operating a window treatment having a headrail, a bottomrail and a window covering material extending therebetween. The safety clutch is mounted on a movable frame within the headrail and is moved to rotatably engage the tube lift cord spool on which lift cords are wound and unwound to raise and lower the bottomrail. A brake mechanism connected to the headrail prevents rotating of the tube lift cord spool, and the brake is automatically disengaged upon operation of the safety clutch. A single pull cord is used to operate the safety clutch and the pull cord is maintained in a raised location when not in use.

REFERENCES:
patent: 12881 (1855-05-01), Webster
patent: 44602 (1864-10-01), Campbell
patent: 2742962 (1956-04-01), Griesser
patent: 2756030 (1956-10-01), Bechtler
patent: 2894577 (1959-07-01), Smith
patent: 3135369 (1964-06-01), Nisenson et al.
patent: 3355149 (1967-11-01), Wiegelmann
patent: 3439726 (1969-04-01), Lageson
patent: 4088171 (1978-05-01), Schluep et al.
patent: 4909298 (1990-03-01), Langhart et al.
patent: 4955421 (1990-09-01), Torti
patent: 5184660 (1993-02-01), Jelic
patent: 5611386 (1997-03-01), Wang
patent: 5791393 (1998-08-01), Judkins
patent: 5890529 (1999-04-01), Haarer

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