Roof drill bit
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United States of America Patent
Stats
-
May 7, 1985
Issued Date -
N/A
app pub date -
Aug 21, 1984
filing date -
Oct 25, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drill bit for use in mining, and in particular in rotative and percussion drilling action which includes a generally cylindrical body with a driving shank at one end and a transverse cutting insert at the other end. The body is hollow to conduct a suction force to the drilling area and side ports are formed in the body connected to the hollow center to draw in dust, chips and cuttings resulting from the drilling action. The shape and extent of the side ports is disclosed as 1/4 to 1/3 of the axial length of the body of the bit and circumferentially significantly increased with a shape which provides circumferential access to the ports as well as radial.
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