Telescopic booms
US5731987A · kind A · utility
19Cited by
11References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1996 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/905
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An operating system for telescoping a telescopic boom for a crane, particularly a boom having three or more telescoping sections, enabling the boom to be extended and retracted automatically under load according to a predetermined sequence which optimises the load capacity of the boom and the stability of the crane. The boom may be switched rapidly between modes of operation in one of which all of the telescoping sections may extend or retract and in another of which at least one telescoping section is maintained in the fully retracted position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.