Window blind device
First Claim
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1. A window blind device comprising:
- a headrail extending in a longitudinal direction;
a bottomrail which extends in the longitudinal direction to terminate at left and right ends, and which are movable relative to said headrail in an upright direction between an uppermost position and a lowermost position;
a window shade having an upper end connected to said headrail, and a lower end connected to said bottomrail so as to be moved therewith;
a first control wheel including a first wheel hub mounted rotatably on one of said headrail and said bottomrail about a first wheel axis;
a second control wheel including a second wheel hub mounted rotatably on said one of said headrail and said bottomrail about a second wheel axis parallel to the first wheel axis; and
a coil spring having a looped end portion sleeved on said first wheel hub, and a spring body wound on said first wheel hub and extending from said looped end portion to terminate at a leading spring end which is connected to said second wheel hub,wherein said first and second control wheels are coupled to the other one of said headrail and said bottomrail, such that in synchrony with displacement of said bottomrail from the uppermost position to the lowermost position, said looped end portion and said first wheel hub are rotated relative to each other, wherein said coil spring is a flat coil spring, and said looped end portion is formed by welding a terminal region onto an innermost coil.
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Accused Products
Abstract
A window blind device includes a headrail, a bottomrail, a window shade, first and second control wheels, first and second cord spools, first and second cords, and a coil spring. The coil spring has a looped end portion sleeved on a first wheel hub of the first control wheel, and a spring body wound on the first wheel hub and extending from the looped end portion to terminate at a leading spring end which is connected to a second wheel hub of the second control wheel.
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Citations
7 Claims
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1. A window blind device comprising:
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a headrail extending in a longitudinal direction; a bottomrail which extends in the longitudinal direction to terminate at left and right ends, and which are movable relative to said headrail in an upright direction between an uppermost position and a lowermost position; a window shade having an upper end connected to said headrail, and a lower end connected to said bottomrail so as to be moved therewith; a first control wheel including a first wheel hub mounted rotatably on one of said headrail and said bottomrail about a first wheel axis; a second control wheel including a second wheel hub mounted rotatably on said one of said headrail and said bottomrail about a second wheel axis parallel to the first wheel axis; and a coil spring having a looped end portion sleeved on said first wheel hub, and a spring body wound on said first wheel hub and extending from said looped end portion to terminate at a leading spring end which is connected to said second wheel hub, wherein said first and second control wheels are coupled to the other one of said headrail and said bottomrail, such that in synchrony with displacement of said bottomrail from the uppermost position to the lowermost position, said looped end portion and said first wheel hub are rotated relative to each other, wherein said coil spring is a flat coil spring, and said looped end portion is formed by welding a terminal region onto an innermost coil. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification