Rotary-percussive hydraulic perforator provided with a stop piston and a braking chamber
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United States of America Patent
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Jun 4, 2024
Grant Date -
Sep 1, 2022
app pub date -
Feb 28, 2022
filing date -
Mar 1, 2021
priority date (Note) -
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Abstract
The rotary-percussive hydraulic perforator includes a body; a shank; a striking piston configured to strike the shank and provided with a braking surface; a braking chamber configured to hydraulically brake the striking piston; a stop piston configured to apply a pushing force on the shank and provided with a bearing surface configured to abut against a stop surface provided on the body, so as to limit the stroke of displacement of the stop piston towards the shank. The rotary-percussive hydraulic perforator is configured such that the bearing surface and the stop surface are axially spaced apart by a predetermined spacing distance simultaneously when (i) the shank bears on the stop piston and is in contact with the striking piston, and (ii) the braking surface is located at an inlet edge of the braking chamber.
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