Mattress spring core with open ended coils
US4609186A · kind A · utility
53Cited by
10References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1985 |
| Grant date | Sep 2, 1986 |
| Priority date | — |
| Expiry date | Nov 14, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C27/07
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A spring core comprises a plurality of coil springs 10 each made of a single, continuous piece of wire having two open ended final windings 11 which are approximately U-shaped. The coil springs are held together by spiral shaped connecting elements 30 enclosing the straight lateral arms 12, 13 of the final windings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.