Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent
1976-08-26
1978-07-25
Hafer, Robert A.
Tool driving or impacting
Means to drive tool about an axis
Means to hold and relatively rotate sections of tool shaft
175320, E21B 300
Patent
active
041024117
ABSTRACT:
A drill stem especially adapted for use in a boring machine which drills upwardly, having pin and box joints on its respective ends, having a circumferential collar that is utilized for both vertical and rotational support of the drill stem section, and additionally having a spline connection on its lower end which is utilized for imparting rotating drive.
REFERENCES:
patent: 1787049 (1930-11-01), Brinton
patent: 2953351 (1960-09-01), Bodine et al.
patent: 3463247 (1969-08-01), Klein
patent: 3680412 (1972-08-01), Mayer et al.
patent: 3917321 (1975-11-01), Rodgers
Berry Robert W.
Funsten Stanard R.
Steinke John F.
Webb Daniel R.
Arant Gene W.
Hafer Robert A.
Smith International Inc.
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