Separated ring segment dual pivot lift crane
US4358021A · kind A · utility
17Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1980 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Mar 7, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/108331
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Front and rear pairs of crawler assemblies are provided for supporting separated ring segments disposed forwardly under the boom and rearwardly under the counterweight so the crane can travel under load and swing through at least a partial horizontal arc with separate pivots for the boom and counterweight. One and preferably both crawler assemblies are selectively and reversely powered to facilitate forward and reverse as well as turning movement during travel under loaded and unloaded conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.