Abstract: A reversible ground perforating device powered by a gaseous medium under ssure, comprising a hollow cylindrical body with a pointed front end. The body accommodates a hammer adapted to reciprocate therein. A front power chamber of variable volume is formed by the hammer in the body. 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 means of ports provided in the hammer. A stepped cylindrical barrel is located inside the cylindrical hollow in the hammer and coaxially therewith. The barrel is secured in the rear end of the body and the large-diameter portion of the barrel is arranged to interact with the hammer. The wall of the large-diameter portion of the barrel has ports. A spring-loaded stepped sleeve is mounted coaxially with the stepped barrel so that the large-diameter portion of the sleeve is adapted to cover the ports in the barrel.
Type:
Grant
Filed:
June 7, 1977
Date of Patent:
October 23, 1979
Assignee:
Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk S S S R
Inventors:
Khaim B. Tkach, Alexandr D. Kostylev, Vladimir M. Terin, Konstantin B. Skachkov, Alexei D. Terskov, Mikhail J. Bondar, Vladimir F. Drobyazko