E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
121/20
E02F 5/18 (2006.01) E21B 7/26 (2006.01)
Patent
CA 1084359
ABSTRACT OF THE DISCLOSURE A reversible ground perforating device powered by a gaseous medium under pressure, comprising a hollow cylindrical body with a pointed front end, a hammer adapted to reciprocate said body and form a front power chamber of variable volume. The rear end of the hammer has a cylindrical hollow which forms a rear power chamber of variable volume. The power chambers are interconnected by ports in the hammer. A stepped cylindrical barrel is coaxially located inside the cylindrical hollow, and is secured in the rear end of the body. The large-diameter por- tion of the barrel has ports in its wall and interacts with the hammer. A spring-loaded stepped sleeve is mounted coaxially with the stepped barrel so that the large-diameter portion there- of is adapted to cover the ports in the barrel, the large-diameter portions of the sleeve and barrel forming an annular chamber. Holes are provided in the sleeve small-diameter portion interact ing with the barrel small-diameter portion. A ring is coaxially flexibly mounted in the front end of the large-diameter portion of the barrel. The space between the ring, the inner surface of the barrel and the outer surface of the sleeve forms an auxiliary annular chamber which is in communication with the source of a compressed gaseous medium during forward movement of the hammer. The auxiliary annular chamber is in communication with this source during reverse movement of the hammer.
283471
Bondar Mikhail J.
Drobyazko Vladimir F.
Kostylev Alexandr D.
Skachkov Konstantin B.
Terin Vladimir M.
Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr
Marks & Clerk
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