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. 11, 1984
Filed:
Feb. 12, 1982
Dan M Pomeroy, Lummi Island, WA (US);
Russell F Burmester, Bellingham, WA (US);
Other;
Abstract
A portable core drill adapted for sampling dense mineral specimens or the like by urging a fluid cooled/lubricated tubular drill bit into a dense mineral mass from which a sample is to be extracted is comprised of a drive member for imparting a drilling-effective rotary motion to a tubular drill bit about a longitudinal drill axis and a spindle member for coupling the drill bit to the drive member, which spindle member includes a bit fastening member for receiving and retaining the drill bit concentrically in respect of the drill axis. The bit fastening member, in turn, is comprised of a bit-engaging collet member, received in a collet housing having tapered sidewalls and an end wall, and a rotatable compression member (i) for constricting the collet member about the outer sidewall of the drill bit at or near the proximal end thereof upon rotation and (ii) for engaging an element on the collet member and urging the collet member outwardly of the collet housing upon counter-rotation; whereby the drill bit may be operatively engaged with and disengaged from the bit fastening member by hand rotation and counter-rotation of the compression member, respectively.