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:
Mar. 12, 1996
Filed:
Mar. 21, 1994
Toshihiro Mine, Hadano, JP;
Shinichi Kazui, Hadano, JP;
Kenji Morita, Isehara, JP;
Hiroyuki Ogino, Kanagawa, JP;
Takeji Shiokawa, Kanagawa, JP;
Hideaki Sasaki, Hadano, JP;
Hitachi, Ltd., , US;
Abstract
A drilling method and a drilling apparatus of a hard brittle material in which a core drill is used for abrasive grinding of high accuracy and high durability. Therefore, the structure of this invention comprises: a tubular core drill; a collet chuck for holding the core drill, including a chuck main body of an integral shape which is hollow, a seal joint provided on the chuck at the inlet side of the lubricant, a slit portion of a pin vise type for holding the core drill, which slit portion is provided on the chuck at the outlet side of the lubricant, and a seal portion provided axially inside of the slit portion, which seal portion has an inner diameter substantially equal to an outer diameter of the core drill applied to the seal portion, and a threaded portion formed on the outer periphery of a portion further axially inside of the seal portion, so that after inserting the core drill into the seal portion, a fastening nut is engaged with and tightened on the threaded portion to thereby seal and fix the core drill, and that the lubricant at a high pressure can be supplied into a central space of the core drill; and a structure for delivering the lubricant through the inner passage of the core drill.