Title:
CORDLESS ROLLER BLIND
Document Type and Number:
WIPO Patent Application WO/2019/153740
Kind Code:
A1
Abstract:
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.
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Inventors:
SCHORLING STEFAN HERMAN GEORG (CN)
Application Number:
PCT/CN2018/105199
Publication Date:
August 15, 2019
Filing Date:
September 12, 2018
Export Citation:
Assignee:
ZHEJIANG HD4U SMART HOME CO LTD (CN)
International Classes:
E06B9/60; E06B9/82
Foreign References:
| CN108266115A | 2018-07-10 | |||
| CN2352660Y | 1999-12-08 | |||
| CN2840111Y | 2006-11-22 | |||
| CN201074473Y | 2008-06-18 | |||
| CN203978250U | 2014-12-03 | |||
| US8844605B2 | 2014-09-30 |
Other References:
See also references of EP 3751090A4
Attorney, Agent or Firm:
HANGZHOU ZHIJIAN PATENT ATTRONEY CO., LTD (CN)
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