Vibration dampened table bushing assembly for rotary drilling ma

Details Vibration dampened table bushing assembly for rotary drilling ma Vibration dampened table bushing assembly for rotary drilling ma

1990-07-23

1992-06-09

Novosad, Stephen J.

Boring or penetrating the earth

Processes

175220, 384215, F16C 2706

Patent

active

051198908

ABSTRACT:
A table bushing is used with a rotary drilling machine of the type having a table through which a drill steel passes. The table bushing uses an automotive tire, or like resilient annular tube, to center the table bushing within an oversized hole in the table. The tire, the pressure of which can be varied according to the operating conditions, dampens vibrations generated while drilling under high thrust loads.

REFERENCES:
patent: 3944300 (1976-03-01), Learmont et al.
patent: 4186973 (1980-02-01), Work
patent: 4351399 (1982-09-01), Lapointe
patent: 4377213 (1983-03-01), Bailey et al.
patent: 4496252 (1985-01-01), Horler et al.
patent: 4943172 (1990-07-01), Waldrep

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