Title:
FLAT SPIRAL SPRING AND CURTAIN DRIVING DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/237461
Kind Code:
A1
Abstract:
A flat spiral spring (1). The torque provided by a working segment (LAC) of a spring plate (10) of the flat spiral spring (1) gradually decreases from an outer ring (11) to an inner ring (12), and the working segment (LAC) consists of a first length section (LAB) and a second length section (LBC) which is connected to the inner end of the first length section (LAB). Within the first length section (LAB), the torque decreases gradually from the outer ring (11) to the inner ring (12) by a first decreasing value per unit length, and within the second length section (LBC), the torque decreases gradually from the outer ring (11) to the inner ring (12) by a second decreasing value per unit length, the first decreasing value being less than the second decreasing value. The present invention makes the torque distribution in the working segment (LAC) of the flat spiral spring (1) match well with the support forces required when a curtain is lifted to different height positions, thereby always providing stable and effective support forces required by the curtain, making the lifting of the curtain more stable.
Inventors:
LEI ZHENBANG (CN)
LEI XINGBANG (CN)
LEI XINGBANG (CN)
Application Number:
PCT/CN2019/088568
Publication Date:
December 03, 2020
Filing Date:
May 27, 2019
Export Citation:
Assignee:
LEI ZHENBANG (CN)
LEI XINGBANG (CN)
LEI XINGBANG (CN)
International Classes:
F16F1/10; A47H5/14
Foreign References:
| CN205805379U | 2016-12-14 | |||
| US20170275943A1 | 2017-09-28 | |||
| CN104302861A | 2015-01-21 | |||
| CN208152908U | 2018-11-27 | |||
| CN206889541U | 2018-01-16 | |||
| US20110024064A1 | 2011-02-03 |
Attorney, Agent or Firm:
SHENZHEN EASYPRO INTELLECTUAL PROPERTY OFFICE (GENERAL PARTNERSHIP) (CN)
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