Importance

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Abstract

A hydraulic pile driver including a housing having an impact weight mounted therein for reciprocating movement, the impact weight being fastened to a piston movable in a cylinder, a supply source for liquid under pressure, a supply conduit communicating with the supply source, a liquid discharge conduit, a control valve for alternatively connecting the supply and discharge conduits to a cylinder chamber at one side of the piston, whereby the piston can be moved by the liquid under pressure in a direction opposite to the direction of movement of the impact weight during the work stroke, the cylinder chamber during the work stroke of the impact weight being connected to the liquid discharge conduit. The piston at the side remote from the cylinder chamber is loaded by a second pressure medium, the overpressure of the second pressure medium being low with respect to the liquid pressure in the cylinder chamber prior to the working stroke, the overpressure being independent of the liquid pressure.

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First Claim