Steering and cutter drum positioning in a paved roadway planing machine
US4270801A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1979 |
| Grant date | Jun 2, 1981 |
| Priority date | — |
| Expiry date | Aug 14, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D7/1509
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A wheeled roadway planing machine in which the wheels are pivotable by individual hydraulic rams for steering purposes. Each ram is controlled by a rotary, blocked-center valve and the valves are simulataneously actuated by a linkage which establishes a pattern of off-center displacements of their valve members to initiate pivoting of the wheels. The valves are mounted on pivotable wheel representation members which pivot with the wheels, via cables connecting the representation members to support shafts upon which the wheels are mounted, to return the valves to their blocked-center positions as the wheels pivot to a pattern of positions on the chassis of the machine similar to the pattern of displacements of the valve members resulting from operation of the linkage. A cutting drum is mounted on the chassis to form a cut in the roadway, such cut having a shape determined by the position of the chassis on the support shafts. Such position and the depth of each side of the cut are shown by scales, mounted on the chassis near each end of the drum and near the rear end of the chassis, and pointers mounted on rods positioned by the roadway surface. String lines, extending between suppor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.