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:
Sep. 08, 1998
Filed:
Aug. 23, 1996
Brooks H Javins, Morgantown, WV (US);
Other;
Abstract
A down-hole pneumatic rotary-percussion hammer drilling apparatus is disclosed. The apparatus includes a drill string for progressively extending into a hole in the earth; an elongated housing connected to the drill string; an impact drill bit, rotationally coupled to the housing, having an engaging surface, an earth impacting surface, a channel, and a plurality of conduits extending from about an exit of the channel to an exit portion of the conduits; a piston within the housing for engaging the engaging surface; and a working fluid handler for energizing the piston with a working fluid. The impact drill bit is rotatable about a longitudinal axis, with the channel and the conduits providing a path of flow of the working fluid from the piston to the exit portions of the conduits. The exit portions are displaced from the longitudinal axis and extend generally downwardly and outwardly. The working fluid emerges from the exit portions and effects rotation of the impact drill bit about the longitudinal axis. Associated method and impact drill bit apparatus are also disclosed.