Valve piloting arrangements for hydraulic percussion devices
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United States of America Patent
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Jun 20, 2023
Grant Date -
May 28, 2020
app pub date -
Jul 17, 2018
filing date -
Jul 20, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A hydraulic percussion device comprising a piston mounted for reciprocal motion within a cylinder to impact a percussion bit and a control valve to control reciprocation of the piston. A valve pilot line is arranged to switch the control valve based on the position of the piston within the cylinder, wherein the valve pilot line is alternately connected, by the reciprocal movement of the piston, to high and low pressure lines (P, T) via an undercut in the piston. The undercut is located at a portion of the piston having a diameter less than the maximum sealing diameter of the piston.
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