Linkage lifting apparatus
US4911313A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Dec 9, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C1/66
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A linkage lifting apparatus is disclosed in which a linkage means is mounted on a lifting beam and includes link pivotal connections which may be connected and disconnected from load hooks comprising part of an object to be lifted. The linkage lifting apparatus includes a latching means which holds two link pairs in a position in which the link pivotal connections may engage the load hooks. The latching means is releasable from the link pairs in response to downward movement of the lifting beam against the link pairs. The pivotal connections move into a lifting position in engagement with the hooks in response to force provided by the weight of links comprising part of the two link pairs. The two link pairs and the pivotal connections movable out of the lifting position and the link pairs are again latched by the latching mechanism to hold them free of the load hooks also in response to downward movement of the lifting beam against the link pairs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.