Platform lift
US4600085A · kind A · utility
Inventors
Key dates
| Filing date | Nov 19, 1984 |
| Grant date | Jul 15, 1986 |
| Priority date | — |
| Expiry date | Nov 19, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H3/26
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A platform lift mechanism for theaters, concert halls, etc. The lift device is a module or modules formed of four segments telescopically, vertically extendable or retractable relative to each other, except for a fixed base segment. The platform is secured to the uppermost segment. The second segment carries a rotatable nut adapted to raise and lower an elongated complementary screw secured at its upper end to the third segment. When four modules are used, a synchronizing chain is provided to actuate all modules synchronously. A brake and a motor are provided, either for each module or for all of them. A motor control is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.