Uncategorized
Patent
Uncategorized
255/13
Patent
CA 1095021
ABSTRACT OF THE DISCLOSURE A method of controlling the reversing of pneumatic reversible percussive devices for driving holes in earth, wherein, in order to reverse the operation of the device from forward to reverse and vice versa, the supply of com- pressed air through the feed line is cut off. Then suction is generated in the feed line, whereby the operation of the device is reversed, whereafter the supply of compressed air is restored. The device performing the method of reversing of pneu- matic reversible percussive devices for driving holes in earth includes a hollow housing accomodating therein a reciprocable impact member having a rear working chamber and defining with the housing a front working chamber within the housing. The rear working chamber receives therein a stepped-diameter air supply bush secured in the rear part of the housing. Its greater-diameter stage has ports made therethrough. Accomodated within the greater-diameter stage of the bush is a hollow spring-biased valve element having openings made in the end face thereof, facing the greater-diameter stage of the bush, the apertures being associated with respective valves. The surface of the valve member, cooperating with the bush, has ports made therein, alternatingly aligning with and closing off the respective ports in the bush upon the hollow valve member being rotated about its longitudinal axis. This is attained by the inter- nal surface of the bush and the external surface of the val- ve member defining therebetween a zigzag-shaped groove mo- vably receiving therein a lug. The compressed air feed line has provided therein a an aspirator adapted to create suction in this line, when the operation of the device is to be re- versed.
296707
Kamensky Veniamin V.
Kostylev Alexandr D.
Sudnishnikov Boris V.
Terin Vladimir M.
Tkach Khaim B.
Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr
Marks & Clerk
LandOfFree
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