E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/11
E21B 1/00 (2006.01) E21B 4/14 (2006.01) E21B 21/12 (2006.01)
Patent
CA 1260454
ANNULAR AIR-HAMMER APPARATUS FOR DRILLING HOLES Abstract An annular air-hammer apparatus for drilling holes incorporates a hollow cylindrical case with a stepped bore which has inlet and outlet ports. A rock-cutting tool with an axial opening is fit- ted to the case at the forward end thereof. A chips- receiving sleeve and a stepped ring-shaped hammer are located inside the case, whereby the hammer forms a working-stroke chamber with the case and an idle-stroke chamber with the case, the rock-cut- ting tool and the chips-receiving sleeve. The chips- receiving sleeve has a cylindrical protuberance at its upper end which interacts with the hammer when this is in its topmost position. A channeling means is provided in the idle-stroke chamber at that side thereof which faces the upper end face or the hammer.
516315
Boginsky Vladimir P.
Danilov Boris B.
Kogan David I.
Kostylev Alexandr D.
Saveliev Vyacheslav N.
Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Spetsialnoe Konstruktorskoe Bjuro Vsesojuznogo Promyshlennogo Ob
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