Lifting apparatus
US5006034A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1989 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Apr 27, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S414/13
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A lifting apparatus includes a load support device for engaging and supporting a load as the load support device and the load are moved between a lowered position and a raised position relative to a base. A pair of spaced lifting arms are connected at first pivotal connections to the base and at second pivotal connections to the load support device for moving the load support device between its lowered and raised positions. A stabilizer arm is connected at a third pivotal connection to the load support device, and at a fourth pivotal connection to the bases, for controlling a rotational orientation of the load support device about an axis of the second pivotal connection relative to the base. A sprocket is rigidly attached to each of the lifting arms substantially coaxial with the first pivotal connection, and a chain is operably engaged with each sprocket. A power drive, preferably a hydraulic ram, is mounted on the base and operably connected to each chain for moving the chains to rotate the sprockets and the lifting arms to thereby move the load support device between its lowered and raised positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.