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. 25, 1997
Filed:
Mar. 13, 1996
Applicant:
Inventor:
Toshiro Tsuchiya, Hiroshima-ken, JP;
Assignee:
Fujita Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175220 ; 173185 ;
Abstract
A rock drilling apparatus includes a frame having a front end, a guide rod supported on the front end of the frame, a rotary rod extending parallel to the guide rod and supported on the frame for rotation about its own axis and longitudinal movement beyond the front end of the frame, and a drill bit mounted on a front tip end of the rotary rod. The guide rod comprises a shank fixed to the front end of the frame and a tubular member extending substantially fully over the shank and rotatably disposed around the shank.