Folding jib main strut and transportable reeved strut caps
US8839966B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2010 |
| Grant date | Sep 23, 2014 |
| Priority date | — |
| Expiry date | Mar 3, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/82
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method of assembling a mobile lift crane that includes, during operation, i) a rotating bed having attached thereto a luffing jib hoist drum and line, and a rigging winch drum and line, ii) a boom pivotally mounted on the rotating bed, iii) a luffing jib pivotally mounted to the end of the boom, iv) a first strut also pivotally connected to the end of the boom, and v) a second strut connected to the boom below the connection point of the first strut, the method including: a) pivotally connecting the first strut to the end of the boom; b) pivotally connecting a first section of the second strut near the top of the boom; c) connecting the rigging winch line to the top of the first section; d) pivotally attaching a second section of the second strut to the first section such that the second section lies folded onto the first section, forming a folded second strut; and e) lifting the second section while retracting the rigging winch line to thereby bring the first and second sections into alignment with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.