Deep excavator
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United States of America Patent
Stats
-
Dec 27, 1994
Grant Date -
N/A
app pub date -
Mar 12, 1993
filing date -
Apr 23, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A stretchable arm of a deep excavator comprises top, middle and base arms wherein a bucket is suspended from the top arm and a working unit is fixed to the middle arm. Two hydraulic cylinders constituting the working unit are arranged in parallel with each other while cylinder rods thereof are oppositely directed, wherein the cylinder rod of one hydraulic cylinder is coupled to the base arm and the cylinder rod of the other hydraulic cylinder is coupled to the top arm. It is possible to extend and contract each arm of the stretchable arm synchronously with one another at higher speed compared with a conventional deep excavator having a single hydraulic cylinder. The oil under pressure which flows out from the discharge chamber of each hydraulic cylinder can be merged into the oil under pressure for extending each hydraulic cylinder so that the amount of oil to be supplied to the pressure chamber is increased.
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