E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/28 (2006.01) E21B 4/14 (2006.01)
Patent
CA 2621022
The present invention relates to a percussion hammer for enlarging drilled holes. The hammer comprises an external outer wear sleeve (5), an inner cylinder (7) mounted co- axially within the outer wear sleeve (5) , a tubular torque shaft (3) disposed axially and centrally of the hammer assembly, and extending longitudinally through the assembly. The hammer further comprises a sliding piston (6) mounted for reciprocating movement within the inner cylinder (7) and outer wear sleeve (10) and about the tubular torque shaft (3) to strike a hammer bit (1) for reciprocal movement in a chuck (4) adjacent a forward end of the hammer assembly. The hammer bit (1) has a central bore (46) through which the torque shaft (3) extends, such that the torque shaft (3) protrudes forwardly of the hammer.
La présente invention concerne un marteau à percussion pour agrandir des trous percés. Le marteau comprend un manchon d~usure externe (5), un cylindre interne (7) monté de façon co-axiale à l~intérieur du manchon d~usure externe (5), un arbre de torsion tubulaire (3) disposé de façon axiale et centrale de l~ensemble marteau et s~étendant longitudinalement à travers l~ensemble. Le marteau comprend en outre un piston coulissant (6) monté pour un mouvement alternatif à l~intérieur du cylindre interne (7) et du manchon d~usure externe (10) et autour de l~arbre de torsion tubulaire (3) pour frapper un foret de marteau (1) pour un mouvement alternatif dans un mandrin (4) à côté d~une extrémité avant de l~ensemble marteau. Le foret de marteau (1) possède un alésage central (46) à travers lequel s~étend l~arbre de torsion (3), de sorte que l~arbre de torsion (3) fasse saillie vers l~avant du marteau.
Minroc Technical Promotions Limited
Smart & Biggar
LandOfFree
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