Bead-chain drive for roll up blinds

Details Bead-chain drive for roll up blinds Bead-chain drive for roll up blinds

1989-07-03

1990-06-12

Purol, David M.

Flexible or portable closure, partition, or panel

Roll type

With rotating means

160300, 160308, A47H 100

Patent

active

049324560

ABSTRACT:
The disclosed ball-chain drive for a wind-up blind has a chain-activated locking device that acts directly on the sprocket and remains effective even if the ball chain breaks or is jostled. The locking device in one form has such symmetry that the ball-chain drive is usable at either end of the wind-up blind.

REFERENCES:
patent: 197234 (1877-11-01), Wagner
patent: 2564831 (1951-08-01), Butkus
patent: 2773547 (1956-12-01), Voss
patent: 2894578 (1959-07-01), Caesar et al.
patent: 3854517 (1974-12-01), Nakamura
patent: 4139044 (1979-02-01), Brolin
patent: 4475580 (1984-10-01), Hennequin
patent: 4476910 (1984-10-01), Saito
patent: 4779662 (1988-10-01), Wilk

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