Heavy-duty crane with counterweight
US4280627A · kind A · utility
25Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1979 |
| Grant date | Jul 28, 1981 |
| Priority date | — |
| Expiry date | Jan 5, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/76
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
In a heavy-duty crane particularly suitable for lifting heavy loads over tall buildings, a substructure supports a rotatable main boom. A jib for carrying the load and a secondary spar for carrying a counterweight by means of a cable are hinged to the tip of the main boom. The counterweight swivels together with turning of the loaded crane. The jib is guyed by way of the secondary spar which overhangs so far that the counterweight is disposed beyond the confines of the substructure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.