Offset continuous row coil spring assembly
US4771494A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Feb 2, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21F27/16
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A spring assembly for mattresses, innersprings, and the like. The assembly comprises rows of coils, each row comprising a continuous length of wire formed into a plurality of coils interconnected by Z-shaped wire segments alternately disposed at the top and bottom of the coils. Adjacent rows of coils are connected by helical wire wound through overlapping sections of the Z-shaped wire segments. The overlapping connected sections are straight, flat offset sections located on opposite sides of each coil with the center of each overlapped section being located in a common diametral plane of the coil so that complete compression of the coil does not result in the coil being pulled laterally, twisted and distorted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.