Box spring assembly
US4004304A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1975 |
| Grant date | Jan 25, 1977 |
| Priority date | — |
| Expiry date | Dec 15, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C23/05
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A spring assembly comprising, spaced pairs of crossing wires welded at their intersections such as to form a dimensionally stable structure wherein the pairs of crossing wires define seats for attachment thereto of the end loops of coiled springs, characterized in that at least two of the wires of the seats are spaced apart a distance less than the distance of the diameter of the end loops and contain deviations perpendicular to the plane of the structure providing longitudinal downwardly facing openings and an upwardly facing opening between the downwardly facing openings and wherein the end loops have arcuate portions which pass through the downwardly facing openings from the inner side outwardly and deviating portions which pass through the upwardly facing openings from the outer side inwardly and wherein the distance between the deviating portions and the end loops is less than the distance between the wires.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.