Working tool operation range limiting apparatus

Details Working tool operation range limiting apparatus Working tool operation range limiting apparatus

1994-01-14

1996-02-06

Ruggiero, Joseph

Boots, shoes, and leggings

37414, 212280, 340685, 36442407, G06F 1900

Patent

active

054900816

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 the working tool accelerating pattern V.sub.4 intersects with a working tool velocity V.sub.3, which corresponds to the amount of operations of the working tool levers (1, 2), the working tool moves at the velocity V.sub.3.

REFERENCES:
patent: 5198800 (1993-03-01), Tozawa et al.
patent: 5335176 (1994-08-01), Nakamura
patent: 5359542 (1994-10-01), Pahmeier et al.

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