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:
Aug. 13, 2002
Filed:
Jun. 05, 2000
Alan Martyn Eddison, Stonehaven, GB;
Ronnie Hardie, Portlethen, GB;
Andergauge Limited, Aberdeen, GB;
Abstract
A percussion drill has a tubular fluid transmitting body with a drill bit mounted on a drill bit support itself mounted in body via a spring and salines A mass is spring mounted in the body and is movable to impact on a face of the support Mounted to the mass is a rotating valve comprising two valve plates Each plate defines a slot such that rotation of one of the valve plates relative to the other moves the slots into and out of alignment; the change in alignment of the slots alters the flow of drilling fluid through the valve so altering the drilling fluid pressure force acting on the mass so causing mass to push against the spring and impact on the drill bit support providing a percussive act ion at the drill bit