Spring coils for innerspring assemblies and methods of manufacture
US8979079B2 · kind B2 · utility
5Cited by
35References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2011 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Apr 13, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49826
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A progressive spring coil comprises a first spring portion comprising a top end and a bottom end and having a first spring rate, wherein the first spring rate is substantially linear or substantially nonlinear; a second spring portion comprising a top end and a bottom end and having a second spring rate, wherein the second spring rate is substantially linear or substantially nonlinear; and a third spring portion disposed between the first spring portion and the second spring portion, wherein the third spring portion has a third spring rate, wherein the third spring rate is substantially linear or substantially nonlinear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.