Articulated aerial device including an upper boom compensation unit
US6810993B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2002 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Jul 29, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F11/044
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An aerial lift apparatus unit includes at least a lower boom pivotally interconnected to a transport unit for raising and lowering of the lower boom. An upper boom is pivotally connected to the outer end of the lower boom for raising and lowering of the upper boom with respect to the lower boom. A single integrated lifting and compensating cylinder unit includes an elongated cylinder with a piston and piston rod journaled in the one end and operable to extend outwardly therefrom. The cylinder defines a dual operating cylinder with a base end from which the piston rod extends and an inner base end extending from the base end and defining an upper boom/compensating unit. A hydraulic control system includes a first hydraulic gated control system for raising and positioning of the upper boom relative to the lower boom. A hydraulic unit and control system for raising and lowering of the lower boom includes a control module connected to the upper boom/compensating unit and an interrelated positioning module to the lower boom and connected to the hydraulic system for raising and lowering of the lower boom. The control module and lower boom module are connected to each other in response to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.