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:
Nov. 03, 1987
Filed:
Oct. 25, 1983
Applicant:
Inventor:
Clarence W Johnson, Calgary, CA;
Assignee:
Bralorne Resources Limited, Calgary, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
173152 ; 173 28 ;
Abstract
A mobile drilling apparatus having a support structure, a mast positioned on the support structure, a drill head and a hydraulic assembly vertically operable on and guided by the mast. The hydraulic assembly moves the drill head and includes lower hydraulic cylinders rigidly connected to the mast and upper cylinders, each mounted inside and connected rigidly to a tube. A piston rod with connected upper and lower pistons is movable within the upper and lower hydraulic cylinders. The drill head is connected to the lower portion of the tube.