Gear cutting – milling – or planing – Milling – Randomly manipulated – work supported – or work following device
Reexamination Certificate
2002-06-07
2004-06-22
Cadugan, Erica (Department: 3722)
Gear cutting, milling, or planing
Milling
Randomly manipulated, work supported, or work following device
C409S182000, C409S180000, C144S048600, C144S136950, C144S135200, C033S027030
Reexamination Certificate
active
06752572
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention generally relates accessories for use with powered rotary hand tools, and more particularly to a circle cutting accessory for use with such rotary hand tools.
There has been continued innovation and improvement in the design of accessories for powered rotary hand tools, particularly with regard to accessories that can be used to carry out specialized tasks in woodworking, metal working and the like. Examples of such powered rotary hand tools are those produced under the Dremel brand by the S-B Power Tool Corporation of Chicago, Ill., which also produces many accessory attachments for such rotary hand tools. The rotary hand tools are generally cylindrical in shape and have a motorized drive unit with a rotary output shaft that is adapted to drive the various rotary tools, such as small saw blades, sander discs, grout removal tools and various shaped cutting tool bits. Depth guide attachments are frequently used in connection with the rotary hand tools so that the user may selectively adjust the depth of the cutting tool bit relative to the work surface. Such depth guide attachments are exemplified by those marketed under the Dremel brand.
While circle cutting jigs, which are often referred to as circle cutters, have been available for many years, the manner in which they are coupled to the rotary hand tool has been the subject of continuing efforts to provide a simple and effective mechanism for quickly and securely attaching and detaching the rotary hand tool to the circle cutter. Similarly, conventional circle cutters have been confined to a limited range of cutting radii. Thus, the manner in which conventional circle cutters are presently coupled to rotary hand tools is presently cumbersome, and the size of circles to be cut by the tool has been unduly limited.
SUMMARY OF THE INVENTION
The present invention is related to a circle cutter accessory that provides for quick and secure attachment and detachment of a generally cylindrical, powered rotary hand tool of the type having an output shaft with a tool bit at one end, and is used with a second accessory attachment, such as a depth guide attachment. The second accessory attachment typically used with the rotary hand tool has a generally cylindrical body and an outwardly extending annular flange at the tool bit end of the combination, where the annular flange has a first predetermined diameter around a substantial portion of the circumference thereof.
The circle cutter accessory of the present invention includes a generally flat housing for receiving and supporting the second accessory and the rotary hand tool. A locking assembly is mounted to the housing for releasably retaining the second accessory attachment and the rotary hand tool, and includes a stationary and a sliding plate, the latter of which is movable between an open and a locked position. Both the sliding plate and the stationary plate include a flange, and each respective flange is disposed to oppose the other flange. In the locked position, the flanges of the sliding plate and stationary plate are biased toward one another under spring force, while in the open position, the flanges are separated by a distance sufficient to allow insertion of the annular flange of the second accessory attachment.
The present invention is also related to a circle cutter accessory for a rotary cutting tool including a generally elongate arm having at least one longitudinal slot along at least a substantial portion thereof, and a circle center and sizing elongated member configured to be removably connected to the arm. The member nests in an underside of the arm, and has a centering pin extending downwardly from a first end portion. A threaded connector extends upwardly therefrom at a second end portion, through the longitudinal slot of the arm to releasably secure the member to the arm. Because the member is removable from the arm, the first and second end portions of the member are reversible relative to the arm so as to greatly vary the size of the circles to be cut by the arm.
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Pjevach Robert D.
Talesky Mark S.
Cadugan Erica
Greer Burns & Crain Ltd.
Ross Dana
S-B Power Tool Corporation
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