Vertical folding wheelchair frame
US5593173A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1994 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Nov 8, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61G5/1067
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A vertical foldable wheelchair (10) having a pair of side frame assemblies (11, 11') each including frame members coupled together for selective movement of the side frame assemblies (11, 11') between a vertically extended deployed condition and a relatively vertically compact collapsed condition. The frame members are coupled together to provide a bi-stable, over-center, linkage assembly (13, 13') which is movable between and biased toward both of: (i) a first stable position on one side of a linkage assembly centerline when the side frame assemblies (11, 11') are in the deployed condition; and (ii) a second stable position on an opposite side of the centerline when the side frame assemblies (11, 11') are in the collapsed condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.