Back rest
US4079993A · kind A · utility
Inventor
Key dates
| Filing date | Aug 3, 1976 |
| Grant date | Mar 21, 1978 |
| Priority date | — |
| Expiry date | Aug 3, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C7/42
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A portable back rest, composed of one planar sheet of material adapted particularly, but not exclusively, for use on stadium, or the like, bleacher or plank seats which are not provided with backs. The back rest is of unitary one piece construction and comprises a sheet of material in generally planar configuration which may be stamped or molded into the proper flat configuration for ease of transport and storage. The material from which the back rest is stamped or molded, is flexible so that it may be flexed from its flat transport and storage condition to its operative condition for combination with a bleacher seat. The one piece planar sheet of material from which the back rest is made, has an inherent "memory," or self adjusting characteristic, which urges it at all times to assume its flat transport and storage condition. The back rest is provided with means integral therewith for releasably clamping or locking the back rest in operative position on a bleacher seat. The "memory" or self adjusting characteristic of the sheet from which the back rest is made serves a dual function, it permits bending the back rest for combination with the bleacher seat, and because of this "memo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.