Wheelchairs
US4125169A · kind A · utility
17Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1977 |
| Grant date | Nov 14, 1978 |
| Priority date | — |
| Expiry date | Jun 9, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S180/907
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A power assisted wheelchair has a pair of larger ground wheels with handwheels mounted thereon and a pair of smaller castor wheels carrying motors drivably coupled therewith. The handwheels are rotatable relative to their ground wheels against a spring bias and operate the castor wheel motors on the corresponding sides of the chair through respective switch mechanisms. Variations of this arrangement are possible to suit different ground wheel configurations, the motors can be energized in increasing manner, the motors can be disconnected when the castors turn rearwardly, and the motors can drive through freewheel mechanisms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.