Back rest
US4153293A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 1977 |
| Grant date | May 8, 1979 |
| Priority date | — |
| Expiry date | Sep 6, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60N2/667
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A back rest constructed to be supported at its foot on a seat structure and to rest against the back of the seat structure comprising a rigid frame, a normally flat, flexible back support mounted on the frame with the lower end thereof stationary and the upper end movable and a screw rotatably mounted to the frame at the upper end operable to move the movable end of the flexible back support relative to the stationary end to bow the back support convexly forwardly with respect to the frame. Alternatively, an eccentric supported at the back side of a flexible back support in engagement therewith is used to effect bowing of the flexible back support. A bottom support pivotally connected at one end to the foot of the frame so as to extend forwardly from the foot across the seat provides for holding the foot of the frame against the back of the seat structure and a seat cover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.