Drill

Details Drill Drill

1980-07-03

1982-09-28

Feldbaum, Ronald

Tool driving or impacting

Advance causing or controlling means

Tool advances relative to drive

175220, 308 4A, B23Q 500, E21C 500, B23Q 5027, B23Q 5033

Patent

active

043513999

ABSTRACT:
An earth drilling apparatus including centralizer means for stabilizing a drive rod during drilling operations.

REFERENCES:
patent: 1883070 (1932-10-01), Stone
patent: 2334312 (1943-11-01), Caldwell
patent: 2472999 (1949-06-01), Alexander et al.
patent: 3282356 (1966-11-01), Paulson et al.
patent: 3302983 (1967-02-01), Garrett
patent: 3561545 (1971-02-01), Rassieur
patent: 3730285 (1973-05-01), Anderson et al.
patent: 3933203 (1976-01-01), Evans
patent: 3949818 (1976-04-01), Russell

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