Self-propelled, non-riding trenching machine with a steering mechanism
US4322899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1980 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | May 9, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D51/04
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A hydraulic steering mechanism is used in a self-propelled, non-riding trenching machine of the type having a chassis, a power source, a hydraulic pump driven by the power source, a reservoir supplying hydraulic fluid to the hydraulic pump and a digging boom. The steering mechanism includes a front wheel assembly journaled into the chassis, a double acting cylinder pivotally mounted to the chassis, a piston and rod slidably mounted within the cylinder and pivotally connected to the front wheel assembly, a first port located on one side of the piston and a second port located on an opposite side of the piston, and a manually operable three-position valve communicating with the hydraulic pump and the cylinder so that hydraulic fluid can be directed from the pump alternately to the first or second ports causing the rod alternately to extend or retract thereby rotating the front wheel assembly from side to side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.