Rock drill
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United States of America Patent
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May 21, 2019
Grant Date -
Dec 28, 2017
app pub date -
Jun 21, 2017
filing date -
Jun 22, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A rock drill includes a frame, a percussion member, an axial shank, and an axial sleeve provided within the frame and including a first pressure surface provided in a first pressure space and a second pressure surface provided in a second pressure space. A first channel is provided in the axial sleeve for providing a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame. A second pressure channel connected to the second pressure space is connectable to external pressure. A pressure accumulator is connected to the first pressure space and the flow of the pressure medium outwards from the first pressure space is throttled.
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