Portable riser
US3974894A · kind A · utility
12Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1975 |
| Grant date | Aug 17, 1976 |
| Priority date | — |
| Expiry date | Aug 18, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H3/126
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A portable riser having a plurality of steps which have a travel position in superimposed relation with structure for rolling the riser along the floor, hinge means interconnecting the steps whereby they may be folded out of superimposed relation, a pair of sliders pivotally associated with each step and which are hinged to sliders of an adjacent step by said hinge means whereby lifting of one step causes erection of the riser to an erected position, and latch means automatically operable to prevent movement of the steps beyond erected position and to lock the riser in erected position for use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.