Jib stretching and folding device for use in a crane
US5193698A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1992 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | May 14, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/702
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A jib stretching and folding device is used in a crane having a jib for increasing a lift of the crane, the jib being stretchable from a folded position along a side surface or a lower surface of a boom through a vertically suspended position. The jib stretching and folding device has a jib maneuvering cylinder, an engaging portion formed in a piston rod of the cylinder, an engaging member provided on the jib, and a guide surface formed at at least either of the engaging portion or the engaging member for guiding the engaging member so as to engage with the engaging portion. The jib is made movable between the vertically suspended position and the folded position by way of extension and contraction of the piston rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.