Spring core for a mattress
US4817924A · kind A · utility
47Cited by
11References
2Claims
0Family size
Inventor
Key dates
| Filing date | Apr 28, 1988 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Apr 28, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C27/07
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
The spring core for a mattress consists of several, identically formed spring coils arranged in side by side rows with each row forming a wire piece having an upper and a lower mutually aligned end spiral in a U-shape, and having opposite legs joined together by a base webb. Adjacent coil springs are joined together at their end spirals along abutting legs by helical connecting springs. To arrange the springs at tight angles in rows and columns, a length of one leg is greater than the length of another leg and all the coil springs are oriented in the same direction, except along a edge region of the spring core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.