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. 11, 1995
Filed:
Jun. 08, 1994
Davide Trevisani, Cesena, IT;
Trevi S.p.A., Cesena, IT;
Abstract
A drilling tool is adapted for being releasably mounted to a lower end of a rod string (20) of a drilling rig (30) and includes a container (2) having a cylindrical or truncated-cone shape fitted at the lower end with a plurality of cutting tools or cutters (10) for crushing rock. The drilling tool (1) further includes a plate (3) for releasably retaining a plurality of modular elements (14) forming a load (13), and curved blades (9), which are located proximate to the cutting tools (10), adapted for conveying rock spalls into the container (2) through suitable apertures (8) in a bottom of the container (2). The cutting tools (10) are mounted to a plurality of radial plates (7) securely fixed proximate to the bottom edge of the container (2). The curved blades are welded to the edges of the radial plates (7), the concavity of each blade (9) being arranged facing the direction of rotation of the drilling tool (1).