Spring counterbalance apparatus and method
US9103157B2 · kind B2 · utility
11Cited by
26References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2013 |
| Grant date | Aug 11, 2015 |
| Priority date | — |
| Expiry date | Jul 27, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/3222
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A spring counterbalance apparatus and method consists of a shade system with a torque profile, where the shade system is connected with a drive shaft. A first spring system is connected with the drive shaft where the first spring system is a standard wound spring system. A second spring system is connected with the drive shaft where the second spring system is a reverse wound spring system and where, in combination, the first spring system and the second spring system produce a counterbalance torque profile approximately equal to the shade system torque profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.