DRILL BIT SHAFT STRUCTURE FOR EXCAVATION APPARATUS
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United States of America Patent
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-
N/A
Issued Date -
Mar 18, 2010
app pub date -
Sep 3, 2009
filing date -
Sep 16, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The drill bit shaft structure for an excavation apparatus has a thin-walled shaft portion formed on a hollow drill bit shaft. The thin-walled shaft portion has a thinner wall than that of shaft portions of the hollow drill bit shaft adjacent to both ends of the thin-walled shaft portion. A cylindrical body provided with an adjustable joining structure is disposed so as to envelop the thin-walled shaft portion. Both ends of the cylindrical body are connected to the shaft portions of the hollow drill bit shaft adjacent to the both ends of the thin-walled shaft portion. The direction of excavation is controlled by bending the thin-walled shaft portion and the cylindrical body.
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