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. 21, 1987
Filed:
Aug. 05, 1985
Applicant:
Inventor:
Toshio Ohi, Takasaki, JP;
Assignees:
Furukawa Co., Ltd., Tokyo, JP;
Okumura Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
173 50 ; 173 57 ; 173 80 ;
Abstract
A rock drill for drilling a plurality of arrayed continuous bores includes a plurality of rods positioned so as to be able to drill several arrayed continuous bores, a rotating member to give rotation to the rods and a single percussion member which imparts percussive force to the plurality of rods. The plurality of rods may be passed through integrally formed rod guides by connecting several cylindrical members juxtaposed in parallel. The guide rod may optionally include, at its rear end, a swivel which also acts as a rod holder.