Percussion device for a hydraulic rock drilling machine, method of operation of a percussion device and hydraulic rock drilling machine including a percussion device
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United States of America Patent
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Jan 2, 2018
Grant Date -
Oct 15, 2015
app pub date -
Oct 30, 2013
filing date -
Nov 28, 2012
priority date (Note) -
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Abstract
A percussion device for a hydraulic rock drilling machine (1) including, inside a cylinder (4), a to and fro moveable impact piston (3), which is provided with a land portion (12) for cooperation with a braking recess (11) in the cylinder (4) for the establishment of a braking chamber in advanced positions of the impact piston, wherein a throttle slit (17) is arranged to be established between the land portion (12) and the braking recess (11). A pressure channel (14), being connected to a pressure medium source, is arranged to debouch in the cylinder (4) between the piston guiding device (6) and a position of the land portion (12) in a most advanced position of the impact piston (3). The invention also concerns a method and a hydraulic rock drilling machine.
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