192 clutches and power-stop control – Transmission and brake – Torque-responsive brake
Reexamination Certificate
1999-08-23
2001-01-16
Lorence, Richard M. (Department: 3681)
192 clutches and power-stop control
Transmission and brake
Torque-responsive brake
C160S298000, C160S321000
Reexamination Certificate
active
06173825
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lift control device, and more particularly to lift control device for a roller shade.
2. Description of the Related Art
The closest prior art of which the applicant is aware is disclosed in U.S. Pat. No. 4,433,765 to Rude et al., filed on Sep. 13, 1982, entitled “Spring Clutches”. However, the springs are separately mounted on a limit rod, and the lugs for each of the springs has to align with each other so as to be fit into the slot of the cap, thereby making the assembly more difficult. In addition, the inner wall of the slot of the cap only contacts the lug of some of the springs, and cannot contact all of the springs such that the force exerted on the springs is not evenly distributed, thereby decreasing the retaining effect between the springs and the limit rod such that the force is concentrated on the springs which contact the cap causing elastic fatigue during long-term utilization, thereby greatly reducing the lifetime of the springs. The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional spring clutch.
BRIEF SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a lift control device for a roller shade comprising a support rod, one end containing an insert socket therein, a spring mounted on the support rod, a roller cap rotatably mounted on the support rod and containing a retaining opening to secure the spring therein such that the spring is rotated by the roller cap, and a follower spool secured on the roller cap to rotate therewith.
In accordance with another aspect of the present invention, there is provided a lift control device for a roller shade comprising a support rod, and a spring mounted on the support rod and including at least two coiled portions each having a bent distal end, and a connecting lug connecting the two coiled portions, the connecting lug being separated from the bent distal end of each of the two coiled portions.
REFERENCES:
patent: 4372432 (1983-02-01), Waine et al.
patent: 5375643 (1994-12-01), Rude
patent: 5507374 (1996-04-01), Rude
patent: 5669432 (1997-09-01), Nisenson et al.
patent: 5909791 (1999-06-01), DiStefano
patent: 5975186 (1999-11-01), Day
Lorence Richard M.
Thorp Reed & Armstrong LLP
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