Derrick crane
US4524875A · kind A · utility
16Cited by
10References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1982 |
| Grant date | Jun 25, 1985 |
| Priority date | — |
| Expiry date | Sep 28, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2326/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A derrick crane has a jib pivoted by way of a horizontal pivot to the movable member of a bearing device supported by a vertically extending mast and includes devices for raising and lowering a load, luffing the jib and slewing the jib about the mast. The bearing device comprises a single ring of free running balls which are a running fit in part circular registering grooves formed in inner and outer bearing rings. The bearing device is located on the mast in such a position that the line of thrust of the jib passes within the pitch circle diameter of the ring of balls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.