Hammer drill

Details Hammer drill Hammer drill

2009-02-05

2011-10-04

Durand, Paul (Department: 3721)

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

C173S104000, C173S128000

Reexamination Certificate

active

08028760

ABSTRACT:
The invention is to provide a hammer drill which is to be capable of restricting rotation of a bit in a hammer mode, and improve usability.A hammer drill includes a lock plate51in a housing2, and the lock plate51engages with a second gear31so as to lock rotation of the second gear. The lock plate51is provided to be slidable between an engaging position with the second gear31and a non-engaging position, and is biased to the engaging position by a coil spring. The hammer drill further includes a restriction part50on an outer peripheral side of a holding tube46in a mode switching knob44. The restriction part50abuts the lock plate51in one of two phases for engaging a clutch37with only a boss sleeve32so as to hold the lock plate51at the non-engaging position, and cancels the abutment with the lock plate51in the other phase to slide the lock plate51to the engaging position. In a hammer mode, a user can select a state for making rotation of a tool holder3free in one phase or a state for restricting the rotation of the tool holder3in the other phase.

REFERENCES:
patent: 6035945 (2000-03-01), Ichijyou et al.
patent: 2002/0126209 (2002-09-01), Yamada et al.
patent: A-6-262413 (1994-09-01), None
patent: B2-3168363 (2001-03-01), None

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