Impact drill
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United States of America Patent
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-
Nov 8, 2011
Grant Date -
Feb 10, 2011
app pub date -
Aug 7, 2009
filing date -
Jul 29, 2009
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An impact drill includes a housing having an accommodation chamber and a through hole extending from the accommodation chamber to the outside space, a driving mechanism mounted in the accommodation chamber and having a transmission shaft positioned in the through hole for providing an output torque and producing an impact force intermittently upon a resistance, the transmission shaft having a polygonal front segment extending out of the accommodation chamber, and a chuck unit, which has a drill chuck that has a connection barrel defining a polygonal coupling hole that is press-fitted onto the polygonal front segment of the transmission shaft and a first bearing mounted on the connection barrel and received in the through hole to secure the drill chuck to the housing.
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