Self-propelled boom with extendible axles
US6119882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1998 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Dec 4, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Y2200/416
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A self-propelled boom vehicle has an extendible axle and an extendible steering mechanism which has an automatic steering synchronization system. The extendible axle has a hollow central support sleeve and telescopic arm sections. A single hydraulic extension axle is positioned inside the hollow central support sleeve and connects to and drives the telescopic arm sections between their retracted and extended positions. The steering synchronization system includes a pair of steering cylinders in a closed hydraulic circuit working in a master-slave arrangement and which operate inversely with respect to each other. A mechanical check valve is carried by each piston which allows excess hydraulic fluid to flow through the check valve to allow the piston to travel to the end of its stroke to resynchronize the steering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.