Stabilized conical boring tool

Details Stabilized conical boring tool Stabilized conical boring tool

1976-09-13

1978-07-25

Purser, Ernest R.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

175344, 175353, 175372, E21B 924

Patent

active

041024168

ABSTRACT:
A self-advancing conical boring tool with a tapered frame for supporting roller cutters, each of which has a frusto-conical body with a plurality of teeth randomly disposed about its periphery. Each roller cutter is constrained within a pair of thrust bearings and a pair of self-aligning spherical roller bearings for free rotation about an axis that is both oblique and skewed relative to a longitudinal axis of the tool. A flexible diaphragm is captively held to the frame proximate each roller cutter and forms a pressure compensated chamber for a bearing lubricant, one face of the diaphragm being adjacent a thrust bearing and the other face of the diaphragm being exposed to the environment through a vent.

REFERENCES:
patent: 2310289 (1943-02-01), Hokansor
patent: 2336337 (1943-12-01), Zublin
patent: 3977481 (1976-08-01), Fisk
patent: 4000783 (1977-01-01), Hug

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