Importance

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Abstract

An oil supply mechanism in a deep excavator comprising a chassis, a turntable disposed on the chassis, a boom which is pivotally supported on the turntable and is vertically swingable, a stretchable arm arrangement which is stretchable in the longitudinal direction and comprises base, middle arm and top arms, and buckets which are attached to the top arm for excavating and holding earth or sand. The oil supply mechanism includes an oil supply unit provided in the middle arm, and first and second hollow oil supply pipes are airtightly slidable in the oil supply unit and move outwardly from the oil supply unit in opposite direction. The outer end of the first oil supply pipe is coupled with the base arm, and the outer ends of the second oil supply pipe is coupled with the top arm. An inner space of the first oil supply pipes is connected to a hydraulic generating source provided in the chassis, and an inner space of the second oil supply pipe is connected to a hydraulic driving mechanism for the buckets, whereby oil under pressure is supplied from the chassis to the first oil supply pipe, passes through the oil supply unit, then passes through the second oil supply pipe, and is finally supplied to the hydraulic driving mechanism for the buckets.

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First Claim