Title:
HYDRAULIC ROTATION IMPACT DRILL PROVIDED WITH STOP PISTON AND BRAKE CHAMBER
Document Type and Number:
Japanese Patent JP2022133251
Kind Code:
A
Abstract:
To provide a hydraulic rotation impact drill having a simple economical structure, improved in reliability, and not needing an additional external component.SOLUTION: This hydraulic rotation impact drill comprises: a body (3); a shank (21); a strike piston (5) provided with a brake surface and configured to strike the shank; a brake chamber (15) configured to hydraulically brake the strike piston; and a stop piston (17) provided with a bearing surface and configured to apply a pressing force to the shank. The bearing surface is configured to abut against a stop surface provided in the body so as to limit displacement stroke of the stop piston (17) toward the shank. The bearing surface and the stop surface are simultaneously separated by predetermined spacing distances in an axial direction when (i) the shank hits the stop piston to come into contact with the strike piston and (ii) the brake surface is disposed at the inlet edge of the brake chamber.SELECTED DRAWING: Figure 1
Inventors:
FRANCOIS-XAVIER CHEYLUS
MICHEL ESCOLLE
MICHEL ESCOLLE
Application Number:
JP2022027596A
Publication Date:
September 13, 2022
Filing Date:
February 25, 2022
Export Citation:
Assignee:
MONTABERT ROGER
International Classes:
B25D16/00; B25D9/26; B25D17/10; E21B6/00
Attorney, Agent or Firm:
Patent Attorney Corporation Maeda Patent Office
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