Spring unit support and assembly
US3953903A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1974 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Dec 23, 1994 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C23/32
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A coil spring supporting grid structure of the type used to reinforce the top surface of a box spring foundation unit is provided with formations on the longitudinal and transverse wires thereof, enabling a snap-in interconnection with a plurality of coil springs to form a spring unit assembly. Each coil spring convolute engaged by the grid structure is supported on a pair of upwardly extending formations from a pair of spaced parallel first wires and is locked in place by means of two downwardly depending formations from a pair of spaced parallel second wires which extend transversely with respect to the first wires to form the grid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.