Rock drill
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 26, 1989
Grant Date -
N/A
app pub date -
Mar 7, 1988
filing date -
Mar 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rock drill is provided in which an optimum support of the carbide cutting tip or of a cross cutting edge is achieved by the drill head being made square or rectangular in cross-section. This results in an optimum strengthening of the cross-section against fracture in the slot root for the cutting tips. Moreover, catching of the drill in fissured rock and under extreme loads such as in reinforcement drill holes is avoided.
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