Non-rotating stabilizer for raise boring

Details Non-rotating stabilizer for raise boring Non-rotating stabilizer for raise boring

1979-08-24

1981-11-24

Leppink, James A.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175325, 175344, E21D 300

Patent

active

043018769

ABSTRACT:
A non-rotating stabilizer for raise boring having a diameter substantially equal to the raise head and which is positioned below the raise head so as to follow it as the hole is bored is disclosed. A second raise head having a larger diameter than the stabilizer may be positioned below the stabilizer.

REFERENCES:
patent: 2675213 (1954-04-01), Poole et al.
patent: 3063759 (1962-11-01), Moore
patent: 3486572 (1969-12-01), Hamilton et al.
patent: 3659660 (1972-05-01), Conn
patent: 3797592 (1974-03-01), Goodfellow
patent: 3858667 (1975-01-01), Goodfellow
patent: 4010808 (1977-03-01), Youngblood
patent: 4098544 (1978-07-01), Still et al.
patent: 4179001 (1979-12-01), Still et al.

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