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:
Dec. 16, 2014
Filed:
Apr. 14, 2010
Applicant:
Sun Keun Park, Seoul, KR;
Inventor:
Sun Keun Park, Seoul, KR;
Assignee:
Core Geotechnics Co., Ltd., Seoul, KR;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 7/00 (2006.01); E21B 10/40 (2006.01); E21B 6/00 (2006.01); E21B 10/26 (2006.01);
U.S. Cl.
CPC ...
E21B 10/40 (2013.01); E21B 6/00 (2013.01); E21B 10/26 (2013.01);
Abstract
An apparatus for drilling a hole in the ground has a hammer drill installed at a bottom of a rod assembled in multi-stages at support structure on the ground. The hammer drill has a pilot hammer drill and a reamer hammer drill coupled to each other through a key structure formed in the vertical direction so as to allow simultaneous rotations and up-and-down movements relative to each other.