Extension/elevation intra-action device for aerial lift apparatus
US4185426A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1978 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Jan 30, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F17/006
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A telescoping boom lift apparatus having a first boom mounted about a first substantially fixed horizontal pivot axis in a mobile base for vertically pivotable movement with respect thereto and further having a second boom member carried by, and received in, the first boom member is provided with a link secured between a second substantially fixed horizontal pivot axis on the mobile base and a third horizontal pivot axis on the second boom member whereby, when the first boom is rotated through an increasing included vertical angle, the third pivot axis on the second boom member is moved therewith longitudinally of the first boom member and away from the first horizontal axis thereby reciprocating the second boom member along a portion of the length of the first boom member to cause the distal end of the second boom member to increasingly extend beyond the first boom member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.