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:
Aug. 07, 1990
Filed:
Apr. 06, 1989
G Edwin Malzahn, Perry, OK (US);
The Charles Machine Works, Inc., Perry, OK (US);
Abstract
The present invention comprises a rod pusher device which moves a drill string having a directional boring bit at its leading end. The invention includes a conversion device, such as a RIGID link, mounted between a fixed point on the hydraulic thrust cylinder or frame assembly and the moveable drill string to automatically and simultaneously convert the axial movement of the thrust cylinder and drill string into a combined axial and rotational movement of the drill string. The link is removable so that the push rod operator can readily select between axial movement of the drill string or combined axial and rotational movement, and thereby control the path of the borehole.