Impact drill

Details Impact drill Impact drill

2009-08-07

2011-11-08

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Convertible

C173S048000, C173S178000, C173S217000, C279S019500, C279S075000

Reexamination Certificate

active

08051920

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.

REFERENCES:
patent: 6142242 (2000-11-01), Okumura et al.
patent: 6550786 (2003-04-01), Gifford et al.
patent: 7168503 (2007-01-01), Teng
patent: 7308948 (2007-12-01), Furuta
patent: 7334646 (2008-02-01), Hara et al.
patent: 7410007 (2008-08-01), Chung et al.
patent: 7793572 (2010-09-01), Hirt et al.
patent: 7828074 (2010-11-01), Tsubakimoto et al.
patent: 7896097 (2011-03-01), Teng

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