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:
Jan. 05, 1988
Filed:
Oct. 28, 1986
Edmund Isakov, Latrobe, PA (US);
Kennametal Inc., Latrobe, PA (US);
Abstract
A rotary percussion rock drill bit has a body and a symmetrical cross-like arrangement of crushing and cutting inserts secured on the body. The bit body has a rearward shank portion and a forward boring head portion with a front face. The cylindrical crushing inserts are secured in the forward head portion and have noncutting hemispherical rock crushing ends exposed at the front face of the head portion. The cutting inserts, which can be rectangular or cylindrical in shape, are secured in the forward head portion and have roof-shaped ends exposed at the front face of the head portion. A peak of each roof-shaped end defines a rock cutting edge. The crushing and cutting inserts are arranged on the head portion with their respective hemispherical and roof-shaped ends in a symmetrical cross-like pattern. The bit body also has a longitudinal central axis, and the crushing and cutting inserts are aligned along planes disposed in orthogonal relation to one another and intersecting at the central axis. At least one crushing insert is disposed on each opposite side of the central axis along one of the planes, whereas at least one cutting insert is disposed on each opposite side of the central axis along the other of the planes. The cutting edge of each of the cutting inserts extends generally parallel to and offset from the plane along which the cutting inserts are aligned.