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. 29, 2003
Filed:
Apr. 30, 2002
Applicant:
Inventor:
Perry L. Coombs, Claremont, NH (US);
Assignee:
Oldenburg Cannon, Inc., Claremont, NH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B 5/24 ; E21D 2/000 ;
U.S. Cl.
CPC ...
G01B 5/24 ; E21D 2/000 ;
Abstract
A bolt centralizer for a rock bolter, which advances a bolt along a work axis, has a hand pivotably mounted on an arm so as to pivot between first and second hand positions. A pair of fingers is pivotably attached to the hand. When the fingers are in a closed position, they form a centralizer passage which is aligned with the work axis when the hand is in the first hand position. The hand is pivoted to the second hand position to remove the fingers from the bolt to allow a bolt plate and bolt driver to be advanced past the hand.