Cordless roller blind
AssigneeZhejiang Hd4U Smart Home Co., Ltd
InventorStefan Herman Georg Schorling
Life of this patent
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Abstract
A cordless roller blind includes a roller tube, a blind fabric wound around the roller tube, and at least one brake device. A coil spring is arranged in the roller tube, and the torsion of the coil spring changes as the roller tube rotates. The torsion force of the coil spring, the friction force provided by the brake device and the weight of a hanging portion of the blind fabric are mutually balanced, so that the blind fabric remains stationary at any position without an external force. When the external force pushes the blind fabric to move upward, pressure acting on the brake device decreases as the external force offsets the weight of the blind fabric, and the friction decreases accordingly, and the torsion force of the coil spring drives the blind fabric to wind up.
Claims18
A cordless roller blind, comprising a roller tube, a blind fabric wound around the roller tube and a brake device, wherein, a coil spring is arranged in the roller tube, and a torsion force of the coil spring changes as the roller tube rotates;
- the torsion force of the coil spring, friction provided by the brake device and a weight of a hanging portion of the blind fabric are mutually balanced, and the blind fabric remains stationary at any position without an external force and wherein the brake device comprises a rotating disc and a positioning disc in the rotating disc;
- the rotating disc rotates relative to the positioning disc, and the friction of the brake device is provided by friction between the rotating disc and the positioning disc after a mechanical contact between the rotating disc and the positioning disc.
Dependencies are inferred from the claim text.