The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1989
Filed:
Nov. 22, 1988
James F Meek, Houston, TX (US);
Sandvik Rock Tools, Inc., Bristol, VA (US);
Abstract
In a percussion drilling tool, a bit is connected to a drill motor through a mating spline connection. External splines on the bit engage internal splines in the drill motor and have respective load bearing faces disposed in a plane extending radially outwardly from central axes. The splines also include a crest land, and a root land. When the splines are in an abutting centered position, there is a uniform radially measured outer clearance between the external spline crests and the internal spline roots, and a uniform radially measured inner clearance between the external spline roots and the internal spline crests. The outer clearance is less than the inner clearance to prevent abrasive damage below the root diameter of the bit resulting from axial relative movement so that the external spline crests will engage the associated internal spline roots while continually maintaining a spacing between the external spline roots and the internal spline crests.