Title:
HYDRAULIC ROTARY IMPACT HAMMER DRILL COMPRISING STOP PISTON
Document Type and Number:
Japanese Patent JP2022133250
Kind Code:
A
Abstract:
To provide a hydraulic hammer drill which has a simple and economical structure, and simultaneously, has improved performance.SOLUTION: A hydraulic rotary impact hammer drill comprises: a body; a shank 15; an impact piston 5 which is so configured to hit the shank; and a stop piston 13 which is so configured as to position the shank in a prescribed equilibrium position. The body and the stop piston partition a first control chamber 22 which is permanently connected to a high pressure fluid supply conduit 9 and is so configured as to energize the stop piston forward, and a second control chamber 25 which is so configured as to energize the stop piston forward. The hydraulic rotary impact hammer drill includes a fluid communication channel 26 which is opened to the second control chamber and is so configured to supply a high pressure fluid to the second control chamber. The fluid communication channel is provided with a calibration orifice 27.SELECTED DRAWING: Figure 2
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Inventors:
FRANCOIS-XAVIER CHEYLUS
MICHEL ESCOLLE
MICHEL ESCOLLE
Application Number:
JP2022027595A
Publication Date:
September 13, 2022
Filing Date:
February 25, 2022
Export Citation:
Assignee:
MONTABERT ROGER
International Classes:
B25D16/00; B25D9/04; B25D9/14; E21B6/00
Attorney, Agent or Firm:
Patent Attorney Corporation Maeda Patent Office