Vehicle and boom assembly
US4221353A · kind A · utility
26Cited by
2References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1978 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Aug 4, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01M7/0075
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A boom assembly mountable on a vehicle is provided in which the boom is supported at a lower or working position by a first spring. A manually applied force selectively applies a moment to partially rotate a toggle device and to partially lift the boom to an upper or clearance position. The partial rotation of the toggle device activates a second spring and the boom is raised to a second position by the combined force of the manually applied force and the force of the second spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.