Roller mechanism for roller blinds

Details Roller mechanism for roller blinds Roller mechanism for roller blinds

1991-10-08

1992-12-01

Purol, David M.

Flexible or portable closure, partition, or panel

Roll type

With brake or stop

160321, E06B 920

Patent

active

051672693

ABSTRACT:
An improved winding apparatus for a roller blind is disclosed. The winding apparatus includes a clutch mechanism provided between the winding roller and the cord pulley for transmitting rotation of the pulley to rotation of the winding roller. The clutch mechanism is arranged to prevent the urging mechanism from rotating the winding roller when the cord is not handled. It also allows the pulley to rotate a predetermined angle in a screen lifting direction when the cord is operated to lift the screen. At this point, the urging mechanism is permitted to rotate the winding roller in the screen lifting direction. Additionally, when the pulley is rotated by the cord in a screen lowering direction the pulley is first allowed to rotate freely for a predetermined angle. Thereafter, the screen lowering motion of the cord is transmitted through said pulley to said winding roller to lower the screen.

REFERENCES:
patent: 4424851 (1984-01-01), Kohayakawa
patent: 4751953 (1988-06-01), Appel et al.
patent: 4779662 (1988-10-01), Wilk
patent: 4834164 (1989-05-01), Tuhey
patent: 4838333 (1989-06-01), Mottura
patent: 4865109 (1989-09-01), Sherman

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