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. 14, 2020
Filed:
May. 01, 2018
Vermeer Manufacturing Company, Pella, IA (US);
Tanner Vos, Harvey, IA (US);
Clint Recker, Pella, IA (US);
Vermeer Manufacturing Company, Pella, IA (US);
Abstract
A drilling system includes a hollow outer rod drive shaft that is configured to rotate an outer rod of a drill string. The outer rod drive shaft is driven by an offset hydraulic drive system. The drilling system also includes a hollow inner rod drive shaft that is configured to couple to and rotate an inner rod of the drill string at a first end. The inner rod drive shaft is driven by an inline hydraulic drive system. The inner rod drive shaft further defines an axial fluid flow passage. The drilling system also includes a fluid inlet passage that is axially aligned with the axial fluid flow passage of the inner rod drive shaft. The fluid inlet passage is operatively connected to a second end of the inner rod drive shaft. The fluid inlet passage is configured to direct fluid into the axial fluid flow passage of the inner rod drive shaft. The outer rod drive shaft and the inner rod drive shaft are mounted in fixed relative positions.