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:
Sep. 12, 1978
Filed:
Dec. 09, 1976
Applicant:
Inventors:
Karl Wanner, Echterdinged, DE;
Wilbert Reibetanz, Leinfelden, DE;
Assignee:
Robert Bosch GmbH, Stuttgart, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175207 ; 175211 ; 175320 ;
Abstract
A rock drill comprises a shaft having a leading and a trailing end, a shank connected to the trailing end, and a drill head connected to the leading end of the shaft. Means for transporting drilling from the leading end toward the trailing end of the shaft are provided which include at least one channel extending parallel to the shaft from the drill head toward the shank. A shell coaxially surrounds the shaft and bounds the channel, which shell has an open front end adjacent the drill head, a closed rear end facing the shank and at least one transverse bore adjacent the rear end of the shaft and open at the outer surface of the shell.