Earth auger head and excavation method
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United States of America Patent
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Jul 7, 2009
Grant Date -
Jun 5, 2008
app pub date -
Nov 29, 2007
filing date -
Nov 30, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
It is an object of the present invention to provide a more efficient and economically superior earth auger head in which a percussive excavation mechanism part (down-the-hole hammer) is incorporated in order to break up portions that are unsuitable for rotary excavation by the auger, and an excavation method using this auger head. The auger head comprises a rotary excavation mechanism part (1) in which a spiral vane (12) used for earth discharge is provided to the circumferential surface of a rotary tubular part (11), and in which an excavating bit (13) whose outer circumferential side protrudes further downward than the central side is provided to the lower end of this spiral vane; and further comprises a pneumatic percussive excavation mechanism part (2) that is installed inside the rotary tubular part and is disposed so that a percussive body (23) is accommodated in a position that is higher than the lower tip end of the excavating bit. The rotary excavation mechanism part and percussive excavation mechanism part are each independently driven and controlled.
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