Login| Sign Up| Help| Contact|

Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/153740
Kind Code:
A cordless roller blind, comprising: a roller tube (1) provided with a coil spring (23) therein; and a curtain body (2) wound around the roller tube (1). The cordless roller blind further comprises at least one brake device (4). The torsion of the coil spring (23) changes as the roller tube (1) rotates. The torsion of the coil spring (23), the friction provided by the brake device (4), and the weight of a hanging portion of the curtain body (2) are balanced with one another, such that the curtain body (2) can stop at any position without application of an external force. In the provided cordless roller blind, the curtain body (2) can be manually raised or lowered to a desired position as required and will self-lock, and the roller tube (1) itself and a limiting component are not subjected to excessive torque during the self-locking process which may cause irreversible damage.

SCHORLING, Stefan Herman Georg (No 8 Yijiang Road, Chang'an TownHaining, Zhejiang 0, 314400, CN)
Application Number:
Publication Date:
August 15, 2019
Filing Date:
September 12, 2018
Export Citation:
Click for automatic bibliography generation   Help
ZHEJIANG HD4U SMART HOME CO., LTD (No 8 Yijiang Road, Chang'an TownHaining, Zhejiang 0, 314400, CN)
International Classes:
E06B9/60; E06B9/82
Attorney, Agent or Firm:
HANGZHOU ZHIJIAN PATENT ATTRONEY CO., LTD (Rm.1403, Buliding 2No.288 Xinfeng Road, Jianggan Distric, Hangzhou Zhejiang 7, 310017, CN)
Download PDF: