Working tool operation range limiting apparatus
US5490081A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1994 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | Jan 14, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F9/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The velocity of a working tool of a hydraulic excavator can be automatically decelerated and stopped just before the working tool would encounter an obstacle. Hazard regions and decelerating regions which correspond upward, downward, forward, and other positions of the hydraulic excavator are designated and a working tool decelerating pattern V.sub.2 where the working tool velocity decreases from 100% to 0% in a decelerating region is stored in a control unit. When a working tool velocity V.sub.1 which corresponds to the amount of operations of working tool levers (1, 2) intersects with the working tool decelerating pattern V.sub.2 in a decelerating region, the working tool moves at the velocity V.sub.2 and stops just before a hazard region. A restoring pattern where the working tool is restored from a just-before-hazard position to a safety region is stored as a working tool accelerating pattern V.sub.4 where the working tool velocity accelerates from a predetermined velocity just before a hazard region. This working tool accelerating pattern V.sub.4 is stored in the control unit. The working unit velocity is accelerated along the working tool accelerating patter V.sub.4. After th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.