Rubble and core removal apparatus

Details Rubble and core removal apparatus Rubble and core removal apparatus

1977-09-09

1979-05-29

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175310, 175323, 175396, 294 861, E21B 920, E21B 3700

Patent

active

041564715

ABSTRACT:
A rubble and core removal apparatus including a casing, open at one end, with spirally extending flighting disposed therein, the flighting being secured to the inner wall of the casing and extending radially inwardly thereof in changing dimension, the casing having a connection to permit rotation and lifting of the apparatus.

REFERENCES:
patent: 181578 (1876-08-01), Howe
patent: 903194 (1908-11-01), Johanson
patent: 1457583 (1923-06-01), Loofs et al.
patent: 2665796 (1954-01-01), Anderson
patent: 3388949 (1968-06-01), Kozar

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