Wheelchair lift
US4457402A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1982 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Apr 27, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S414/134
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A wheelchair lift operable to transport handicapped persons between a lower level and an upper level. The apparatus includes an elevator platform and a plurality of vertically movable stair members. When the platform is in its lower position, the stair members form a conventional stairway which extends between lower and upper surfaces; and when the platform is moved upwardly, a collecting member attached thereto sequentially collects the stair members and moves them upwardly until the platform and stair members are coplanar with the upper surface. A normally open safety gate on the platform is automatically moved to and retained in a closed position whenever the platform is raised above the lower surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.