Drives for wind-up blinds

Details Drives for wind-up blinds Drives for wind-up blinds

1990-06-07

1993-08-03

Purol, David M.

Flexible or portable closure, partition, or panel

Roll type

With brake or stop

1603041, 160321, A47H 100

Patent

active

052320383

ABSTRACT:
The disclosed drive uses a ball chain and sprocket for adjusting a wind-up blind and a locking device activated by the ball chain into cooperation with the sprocket for blocking the sprocket and locking the drive, avoiding any large stress in the chain.

REFERENCES:
patent: 197234 (1877-11-01), Wagner
patent: 2564831 (1951-08-01), Butkus
patent: 2577046 (1951-12-01), Svirsky
patent: 2773547 (1956-12-01), Voss
patent: 2894578 (1959-07-01), Caesar et al.
patent: 3854517 (1974-12-01), Nakamura
patent: 4139044 (1977-07-01), Brolin
patent: 4475580 (1984-10-01), Hennequin
patent: 4476910 (1984-10-01), Saito
patent: 4779662 (1988-10-01), Wilk
patent: 4932456 (1990-06-01), Buxbaum

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