Boring or penetrating the earth – Boring without earth removal
Patent
1977-03-28
1978-09-19
Purser, Ernest R.
Boring or penetrating the earth
Boring without earth removal
91 19, 91 32, 91234, 173 91, 173137, E21B 1102
Patent
active
041147006
ABSTRACT:
The apparatus has a pointed-nose hollow cylindrical body with a closed rear portion. Disposed inside the body, so as to enable reciprocation and rotation about the axis of the body, is a stepped striker which can be locked against rotation about the axis of the body in two positions, the positions corresponding to forward and reverse movement of the apparatus.
For the purpose of admitting compressed air into a forward working chamber, the striker is provided with a central passage permanently connected to a rear working chamber and at least two radial passages which provide communication between the central passage and an outer cylindrical surface of a large step of the striker. The radial passages are displaced relative to each other both circumferentially and longitudinally along the axis of the body. The body is provided with grooves in an inner surface of its forward portion which define, in conjunction with the outer cylindrical surface of the large step of the striker, passages arranged so that one of the radial passages of the striker is connected to them when the striker is in one of the locked positions.
For the purpose of discharging air from the forward working chamber into the atmosphere, the striker is provided with longitudinal grooves in the outer surface of its large step within the forward portion which define, in conjunction with the body, passages opening into the forward working chamber, the body being provided with ports which recurrently connect the forward working chamber to the atmosphere through these passages.
REFERENCES:
patent: 998477 (1911-07-01), Duval
patent: 1965064 (1934-07-01), Zwayer
patent: 3924690 (1975-12-01), Shaw
patent: 3952813 (1976-04-01), Chepurnoi
patent: 3995702 (1976-12-01), Klimashko
Boginsky Vladimir Petrovich
Gurkov Konstantin Stepanovich
Kostylev Alexandr Dmitrievich
Plavskikh Vladimir Dmitrievich
Smolyanitsky Boris Nikolaevich
Pate III William F.
Purser Ernest R.
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