Dual-torsion-spring cord rolling device for window blind without exposed pull cord
AssigneeSheen World Technology Corporation
InventorsHung-Hao CHEN, Ming-Che TSAI
Life of this patent
Estimating the term…
Abstract
A dual-torsion-spring cord rolling device includes driving and transmission units. The driving unit has first and second torsion spring gears engaged with each other, a first torsion spring connecting the first and second torsion spring gears, a wheel adjacent to the first torsion spring gear, and a second torsion spring connecting the second torsion spring gear and the wheel. The transmission unit has first and second transmission gears rotatable synchronously by the driving of the second torsion spring gear, and two lift transmission cords attached to the first and second transmission gears respectively.
Claims6
A dual-torsion-spring cord rolling device for a window blind without exposed pull cord, the dual-torsion-spring cord rolling device comprising:
- a base;
- a driving unit having a first torsion spring gear, a second torsion spring gear, a first torsion spring, a wheel and a second torsion spring, the first torsion spring gear being rotatably disposed in the base, the second torsion spring gear being rotatably disposed in the base and engaged with the first torsion spring gear, the first torsion spring connecting the first and second torsion spring gears, the wheel being disposed in the base in a way that the wheel is rotatable freely and located adjacent to the first torsion spring gear, the second torsion spring connecting the second torsion spring gear and the wheel;
- and
- a transmission unit having a first transmission gear, a second transmission gear and two lift transmission cords, the first and second transmission gears being disposed in the base in a way that the first and second transmission gears are rotatable synchronously and at least one of the first and second transmission gears is engaged with the second torsion spring gear, an end of one of the two lift transmission cords being attached to the first transmission gear, an end of the other lift transmission cord being attached to the second transmission gear.
Dependencies are inferred from the claim text.