Ring supported mobile tower crane
US4381060A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1980 |
| Grant date | Apr 26, 1983 |
| Priority date | — |
| Expiry date | Jul 9, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/36
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A ring supported mobile lift crane includes a load carrier and a counterweight carrier in riding contact with the ring and a tower mounted on the carrier for pivotal movement between generally horizontal and vertical positions with a boom pivoted to the outer end of the tower and a rearwardly inclined mast mounted on said carrier and connected to the counterweight carrier by rigging a mast pendant, a tower backstay connected to the top of the tower and through tower hoist rigging to the top of the mast. A fixed boom strut is connected at one end to the top of the tower and at the other end to a fixed pendant secured to the carrier and a movable boom strut is connected at one end to the top of the tower and at the other end to a fixed pendant secured to the outer end of the boom, with a multi-part boom hoist line interconnecting the outer ends of the fixed and movable boom struts for raising and lowering the boom, and a tower erection hoist for changing the length of the tower hoist rigging for raising and lowering the tower, boom, boom struts and tower backstay as a unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.