Electric drill apparatus

Cutting by use of rotating axially moving tool – With randomly-actuated stopping means

Reexamination Certificate

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Details

C408S006000, C408S008000, C408S124000, C408S135000

Reexamination Certificate

active

07121773

ABSTRACT:
An electric drill apparatus having a low profile is provided which comprises an annular cutter, a motor for rotating the annular cutter, a rotary shaft assembly for rotating the annular cutter attached to its leading end about a rotating, a rotation reduction mechanism disposed between the motor and rotary shaft assembly for transmitting a driving force of the motor to the annular cutter through the rotary shaft assembly, a feed mechanism responsive to an operation of a manual handle, for moving the rotary shaft assembly along with a straight line to advance or retract the annular cutter attached to the rotary shaft assembly with respect to a workpiece, and an adhesion base for securing the electric drill apparatus to the workpiece. The annular cutter has a plurality of cutting blades comprised of cemented carbide tips fixed on its lower end, thereby it is capable of rotating at a high speed. The rotary shaft assembly has a rotating shaft which rotates in a direction different from that of a rotating shaft of the motor, thereby the drill apparatus has a low profile.

REFERENCES:
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patent: 5719732 (1998-02-01), Nagahama et al.
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patent: 6280123 (2001-08-01), Gill
patent: 03-078205 (1991-04-01), None
patent: 3015010 (1995-06-01), None
patent: 2002-46007 (2002-02-01), None
patent: 2003-025122 (2003-01-01), None

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