Method for stretching and folding a jib for crane
US5115923A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 1991 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Mar 8, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/702
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A device for stretching and folding a strut type jib for a crane, including a jib supporting mechanism for supporting the jib along one side surface of a boom under a vertically disposed condition of the jib where a forward end portion of the jib is directed to a forward end portion of the boom, and opposite flat planes of the jib are oriented horizontally in such a manner that the jib is slidable along the side surface of the boom in a range between a folded position of the jib where a base end portion of the jib is disposed aside a base end portion of the boom and an advance position of the jib where the base end portion of the jib is disposed aside the forward end portion of the boom; a pair of jib supporting shafts projecting outwardly from opposite side surfaces of the forward end portion of the boom; a pair of connecting portions provided at the base end portion of the jib and adapted to be connected to the jib supporting shafts upon stretching of the jib; and an engaging member provided at a lower end portion of the base end portion of the jib under the vertically disposed condition of the jib in such a manner that the jib is rotatable about a longitudinal axis of the jib. T…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.