Curtain blind take-up drive mechanism with non-slip effect

Details Curtain blind take-up drive mechanism with non-slip effect Curtain blind take-up drive mechanism with non-slip effect

2005-06-28

2005-06-28

Lev, Bruce A. (Department: 3634)

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

Venetian blind type

C160S17610R, C160S17810R, C160S16810R

Reexamination Certificate

active

06910516

ABSTRACT:
A curtain blind take-up drive mechanism with non-slip effect having a freehand turn operation. The non-slip effect is configured to prevent slats of the blind from slipping down, and further includes coupling a power end of a drive shaft to a reel. The drive shaft connects to a worm gear via a transmission amplifier. The worm gear is actuated through reciprocally engaging with a worm driven via a flexible shaft coupling and through operation of a slat tilt rod. Reciprocal teeth meshing and teeth surface pressure between the worm gear and the worm achieves a high slip-rate, and thereby inhibits reverse transmission, thus accomplishing a reverse direction stoppage effect, and further producing a large frictional force and forming a surface-pressure slip effect thereof. The transmission amplifier allows the drive shaft to achieve a high rotational speed, thereby facilitating freehand operation for taking-up and letting-down of the slats.

REFERENCES:
patent: 4487243 (1984-12-01), Debs
patent: 4676292 (1987-06-01), Valle et al.
patent: 4773464 (1988-09-01), Kobayashi
patent: 5092387 (1992-03-01), King et al.
patent: 5553649 (1996-09-01), Chisaka et al.
patent: 5603371 (1997-02-01), Gregg
patent: 5749405 (1998-05-01), Huang
patent: 6379276 (2002-04-01), Cheng
patent: 6425432 (2002-07-01), Gross et al.

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