Hydraulic rotary-percussive hammer drill provided with a stop piston
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United States of America Patent
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Jul 11, 2023
Grant Date -
Sep 1, 2022
app pub date -
Feb 28, 2022
filing date -
Mar 1, 2021
priority date (Note) -
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status (Latency Note)
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Abstract
The hydraulic rotary-percussive hammer drill includes a body; a shank; a striking piston configured to hit the shank; a stop piston configured to position the shank in a predetermined balanced position, the body and the stop piston delimiting a first control chamber permanently connected to a high-pressure fluid feed-in conduit and configured to urge the stop piston forwards, and a second control chamber configured to urge the stop piston forwards. The hydraulic rotary-percussive hammer drill comprises a fluidic communication channel opening into the second control chamber, configured to supply the second control chamber with high-pressure fluid and provided with a calibrated orifice.
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