Title: Earth boring bit with means for conducting heat from the bit's bearings

Abstract: The present invention provides a rotary rock bit with a heat pipe for conducting heat from the bit's bearings. The rotary rock bit includes a bit body with a connection for connecting the bit body to a rotary drill string. At least one arm extends from the bit body and a rotatable cutter is mounted on said arm. Bearing means are located between the rotatable cutter and the arm for promoting rotation of the cutter. A heat pipe is positioned in the bit body and the heat pipe extends into the arm. The heat pipe includes an evaporator section located near the bearings and a condenser section located near the external surface of the bit.

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Inventors: McQueen, Robert William (Houston, TX, US)

Application Number: 484049
Filing Date: 1974-06-28
Publication_date: 1976-02-03
Assignee: Dresser Industries, Inc. (Dallas, TX)
Primary Class(es): 175/17 175/228, 175/331, 175/372, 184/6.22, 384/93
Other Classes:
US Patent Ref:

1870696	Aug, 1932	Taylor	175/17.
2356578	Aug, 1944	Galtney	308/76.
2861780	Nov, 1958	Butler	175/17.
3062302	Nov, 1962	Toth et al.	175/39.
3163695	Dec, 1964	Blumberger	308/77.
3650337	Mar, 1972	Andrews et al.	175/17.
3706483	Dec, 1972	Irwin	308/77.
3719241	Mar, 1973	Bell	175/228.
3735825	May, 1973	Keller	175/228.

Other Refs:
Primary Examiner: Purser, Ernest R.
Assistant Examiner: Favreau, Richard E.
Attorney: Scott; Eddie E.