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:
Jul. 27, 2004
Filed:
Nov. 27, 2000
Kenneth Larsson, Sandviken, SE;
Sandvik AB, Sandviken, SE;
Abstract
Two components used in a percussive drill string include a spigot and a sleeve, respectively. The spigot includes a male thread connected to a female thread of the sleeve to form a thread joint. The male and female threads are dimensioned such that axially inner and outer end areas of the female thread are in non-engagement with the male thread when the thread joint is in a tightened state. The spigot includes axially inner and outer conical guiding surfaces facing toward respective axially outer and inner conical guiding surfaces, respectively. Each conical guiding surface forms an angle with a centerline of the sleeve, the angle lying in the range 1 to 20 degrees, to prevent the spigot and the sleeve from being welded together by frictional heat during a drilling operation.