Cutlery – Cutting tools – Saw
Reexamination Certificate
2000-12-18
2002-10-29
Rachuba, M. (Department: 3724)
Cutlery
Cutting tools
Saw
C030S388000, C030SDIG001
Reexamination Certificate
active
06470576
ABSTRACT:
TECHNICAL FIELD
This invention relates to battery powered circular saws for cutting lumber or the like.
BACKGROUND ART
While not as popular as corded AC electric motor driven saws, battery powered circular saws are gaining in popularity due to the convenience of not requiring an electric cord and their lightweight, easy to use size. Battery powered circular saws were typically made using a smaller diameter blade, typically 4″ to 5½″ as opposed to the traditional circular saw which uses a 7″ to 8″ diameter saw blade. The small diameter blade allows a thinner kerf (cut width) resulting in less energy usage and a longer battery life. A 5½″ diameter circular saw can easily cut a standard 2″×4″ board and if properly designed, can even cut a 2″×4″ board when the blade is inclined at 45°.
Early battery powered circular saws were built much like a conventional circular saw with a battery pack merely mounted behind the electric motor. Subsequently, the industry realized that by mounting the battery rearward of the motor, with a horizontal handle extending there between, the saw's balance could be improved. Horizontal handle battery saws with the rear battery orientations, however, required in the user's wrist to be flexed at an uncomfortable angle when the saw base plate was adjusted to the minimum blade extension orientation. Additionally, prior art saws generally contain bulky handles due to the battery placement.
SUMMARY OF INVENTION
It is one of the objectives of the present invention to provide a battery powered circular saw having a handle orientation which is comfortable to the user when the base plate is mounted at the fully extended or minimum blade extended orientation. A further objective is to provide a slimmer handle for improved grip.
Accordingly, a battery powered circular saw is provided which has an electric motor rotatably driving a spindle which supports a thin circular saw blade normal to the transverse spindle axis. The motor housing and handle assembly includes a motor housing portion for supporting the electric motor, an elongate tubular portion housing extending rearwardly longitudinally from the motor housing portion generally perpendicular to the transverse axis and an elongate primary handle having a forward end attached to and spaced above the motor housing portion and a relatively lower rearward end affixed to the elongate tube or handle wherein the primary handle is inclined relative to the elongate tubular house at an angle &bgr; which is 15° to 45°. A battery pack is attached to the rearward end of the primary handle and has an elongated projection which extends into the elongate tubular housing to electrically connect the battery pack to the electric motor.
REFERENCES:
patent: D262772 (1982-01-01), Glass et al.
patent: 4555849 (1985-12-01), Ando et al.
patent: D329363 (1992-09-01), Sasaki et al.
patent: D335433 (1993-05-01), Schultz et al.
patent: D363656 (1995-10-01), Gierke
patent: D375439 (1996-11-01), Niwa et al.
Brooks & Kushman P.C.
Flores-Sánkez Omar
One World Technologies Inc.
Rachuba M.
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