Method for providing pocketed coil strings having a flat overlap side seam
US4854023A · kind A · utility
60Cited by
10References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1988 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Jun 13, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/48
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An improved method and apparatus for constructing an improved pocketed coil string, in which a tube of fabric is formed, a transverse seam is provided across the tube, a partially compressed coil spring is inserted adjacent to the seam, and a second seam is provided, thus encapsulating the spring. The fabric is guided around the outer surface of a tubular mandrel, thus forming a tube, and the spring is inserted into the mandrel such that as the spring exits the opposite side of the mandrel, it is within the tube of fabric. Excessive spring compression is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.