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:
Apr. 16, 2019
Filed:
Jan. 18, 2018
William L. Shepherd, Montgomery, TX (US);
William L. Shepherd, Montgomery, TX (US);
Other;
Abstract
A drilling system for a mining machine, the mining machine including a frame and a boom moveable coupled to the frame and a drill string positioned in a blast hole. The system includes an air compressor, a drill bit connected to the air compressor configured to receive low pressure air. The drill bit has a nozzle free drilling body, three sealed rotating cones, each cone with a plurality of cutting elements. Each cone having a sealed bit bearing assembly with diaphragm free lubricant spaces. A single central air conduit in the drilling body providing continuous high flow rate low pressure air from the drill string configured to strike the plurality of outer surfaces of the sealed rotating cones upon exit of the high flow rate low pressurize air from the single central air conduit cooling the sealed bit bearing assemblies. A relief conduit is used.