Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
2005-12-13
2005-12-13
Johnson, Blair M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
C160S298000, C192S223400
Reexamination Certificate
active
06973952
ABSTRACT:
An anti-reverse transmission for use in a window blind includes a fixed axle, a rotatable input shaft, an output shaft sleeved onto the fixed axle, a transmission shaft sleeved onto the output shaft and coupled to a linking rod of a window blind, the transmission shaft having a protrusion inserted into an opening in the output shaft, and a spiral spring fitted on the fixed axle within the output shaft. The spiral spring has two end tips suspended in the opening such that the spiral spring is radially expanded to disengage the output shaft from the fixed axle for rotation with the transmission shaft and the input shaft upon rotation of the input shaft, and the spiral spring is radially compressed to stop the output shaft from rotation when the transmission shaft receives a biasing force from the gravity weight of a blind body of the window blind.
REFERENCES:
patent: 3194366 (1965-07-01), Hensel
patent: 4372432 (1983-02-01), Waine et al.
patent: 5375643 (1994-12-01), Rude
patent: 5909791 (1999-06-01), DiStefano
patent: 6173754 (2001-01-01), DeBlock
patent: 6173825 (2001-01-01), Liu
patent: 6843302 (2005-01-01), Nijs
patent: 2003/0085003 (2003-05-01), Cheng
patent: 2004/0123957 (2004-07-01), Wen et al.
patent: 2 692 002 (1993-12-01), None
Browdy and Neimark PLLC
Johnson Blair M.
Nien Made Enterprise Co., Ltd.
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