Boom apparatus
US4272222A · kind A · utility
12Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1979 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Jan 11, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/384
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The vertically swingable boom of the apparatus is articulated to present a joint that is spaced outwardly from the horizontal swinging axis of the lift cylinder for the boom. A rigid link transversely and pivotally interconnects the lift cylinder and the inner section of the boom to control articulation of the latter about the joint during swinging of the boom. Consequently, the moment between the line of action of the lift cylinder and the boom remains favorably high at all locations on the path of swinging travel of the boom and the lift cylinder can swing through an arc approaching 180.degree. during its operation of the boom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.