Earth working machine and blade condition control system therefor
US4431060A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1981 |
| Grant date | Feb 14, 1984 |
| Priority date | — |
| Expiry date | Apr 15, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/845
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An earth working machine having an earth shaping blade (30) employs a control system for maintaining the blade (30) at a desired slope relative to a reference grade irrespective of lateral movement of the blade (30) or deflection of front and rear frame sections (15, 18). A ground engaging trailing wheel (96) mounted at the rear of the blade (30) senses rotation of the blade (30) relative to the direction of machine travel resulting from rotation or lateral shifting of the blade (30) and operates a potentiometer (124) to produce a control signal proportional to the magnitude of blade rotation. A first pair of accelerometers (128, 130) mounted on the blade (30) for rotation by the trailing wheel (96) produces blade controlling signals respectively corresponding to the change in slope and pitch of the blade (30) relative to the front frame section (15) of the machine. A second pair of accelerometers (42, 44) mounted at transversely spaced locations on the front frame section (15) produce control signals indicative of the roll of the front frame section (15) while an additional accelerometer (90) mounted on the rear frame section (18) produces control signals indicative of the frame p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.