Drilling tool for use in constructing large diameter piles, ventilating shafts and other similar mining works
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 11, 1995
Grant Date -
N/A
app pub date -
Jun 8, 1994
filing date -
Jun 9, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
First Claim
Other Claims data not available
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International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 3 Citation Count
- E21B Class
- 1.65 % this patent is cited more than
- 30 Age