Cutlery – Cutting tools – Saw
Reexamination Certificate
2001-09-04
2004-04-20
Watts, Douglas D. (Department: 3724)
Cutlery
Cutting tools
Saw
Reexamination Certificate
active
06722046
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to power saws, and more specifically, to a forward-cutting power saw having a drive gear assembly that turns a geared blade attachment plate and an adjacent cutting blade of a greater diameter.
2. Description of the Prior Art
There are other portable devices designed for cutting. Typical of these is U.S. Pat. No. 1,816,966 issued to Albert S. Gray on Aug. 4, 1931.
Another patent was issued to John W. O'Banion on Jan. 9, 1934 as U.S. Pat. No. 1,942,766. Yet another U.S. Pat. No. 2,139,272 was issued to Charles N. Jaworski on Dec. 6, 1938 and still yet another was issued to Francis A. Jimerson et al. on Feb. 15, 1944 as U.S. Pat. No. 2,342,052.
Another patent was issued to Charles D. Hanaway on Jun. 17, 1969 as U.S. Pat. No. 3,449,992. Yet another U.S. Pat. No. 3,616,488 was issued to William A. Barefield on Nov. 2, 1971. Another was issued to Thelma G. Sigler on Apr. 4, 1978 as U.S. Pat. No. 4,081,906 and still yet another was issued on Feb. 10, 1981 to Richard G. H. Bates as U.S. Pat. No. 4,249,313.
Another patent was issued to George A. Boyum et al. on Feb. 7, 1984 as Canadian Patent No. 1,161,797. Yet another Canadian Patent No. 1,225,307 was issued to Douglas R. Mongeon on Aug. 11, 1987. U.S. Pat. No. 5,012,582 was issued to Steven L. Bristol et al. on May 7, 1991 and another patent was issued to Kenneth R. Floyd on Sep. 1, 1992.
U.S. Pat. No. 1,816,966
Inventor: Albert S. Gray
Issued: Aug. 4, 1931
A pruning device comprising a hollow pole, a shaft extending longitudinally of and rotatably supported within the pole, an electric motor secured to the lower end of the pole with it's armature shaft secured to said first shaft, a sleeve on the upper end of the pole and extending above the same, an arm extending longitudinally of one side of the sleeve and provided at its upper end with a bearing boss extending across the upper end of the sleeve, means removably securing the sleeve and arm to the pole, an arbor journaled in the bearing boss, a circular saw secured to the arbor, a stub shaft journaled in the sleeve and detachably connected to said first shaft, meshing gears fixed to the arbor and the stub shaft, an arm extending upwardly from the upper end of said first arm in the direction of the opposite side of the sleeve and to a point beyond the saw, and a shield for the saw removably secured to the upper end of said second arm and to the sleeve.
U.S. Pat. No. 1,942,766
Inventor: John W. O'Banion
Issued: Jan. 9, 1934
A cutting device for a plaster cast comprising a guide adapted for introduction underneath the cast, a rotary cutter mounted for cutting into the plaster as the guide advances, a pistol grip mounted in supporting relation to the guide and the cutter, and having a motor thereon, a driving connection between the motor and the cutter, a guard for the latter and a slide mounted near the pistol grip and operatively connected to the guard for retracting and advancing the same.
U.S. Pat. No. 2,139,272
Inventor: Charles N. Jaworski
Issued: Dec. 6, 1938
A saw for removing plaster casts, said saw including a support, a pair of saws spaced apart and rotatably mounted in said support, a shoe projecting from said support along the peripheries of said saws, a presser lever extending from said support between the saws along the peripheries thereof to clear the space between them and adapted to be positioned with its end below the upper surface of said shoe, and means for rotating said saws.
U.S. Pat. No. 2,342,052
Inventor: Francis A. Jimerson et al.
Issued: Feb 15, 1944
A portable cutting tool, comprising a casing, a rotary toothed cutting disc in the casing, there being a recess in the casing to expose a segment of the cutting disc, a motor for driving the cutting disc, a grip portion on the casing extending laterally of the axis of rotation of the cutting disc and connected to an end of the motor, a grip portion on the other end of the motor, means in one grip portion and the casing for transmitting movement from the motor to the cutting disc, a guard for the cutting disc swingable into the casing and into the plane of the recess, a spring constantly tending to move the guard into the plane of the recess, a transmission member connected to the guard, and a lever on the casing adjacent said grip portion and connected to the transmission member for moving the guard out of the plane of the recess into the casing.
U.S. Pat. No. 3,449,992
Inventor: Charles D. Hanaway
Issued: Jun. 17, 1969
A pipe or bar cutting machine of compact construction having a main frame and a secondary frame with gripping surfaces on both frames and the secondary frame guided and movable on the main frame by a screw adjustment for clamping a work piece. An electric motor with a convenient grip and trigger slidably mounted in the main frame and driving a rotary cutter also slidably mounted in a frame to move the cutter through a work piece clamped between the gripping surfaces of the frames. The frames are conveniently portable by reason of their attachment to the motor and the convenient hand grip on the motor.
U.S. Pat. No. 3,616,488
Inventor: William A. Barefield
Issued: Nov. 2, 1971
A cutting tool for opening the body cavity of chickens to allow easy evisceration and inspection. The tool has a power driven, circular cutting blade which is power driven from a motor contained within a housing that is held in the hand. A guide means extends below the edge of the cutting blade and beneath the tool housing and hand and is inserted into the chicken carcass. There is a blade shield around the front of the blade whereby the only entrance to the blade is between the housing and the insertion member.
U.S. Pat. No. 4,081,906
Inventor: Thelma G. Sigler
Issued: Apr. 4, 1978
A hand held electrically driven cutter assembly for removing casts from the body of a patient includes a vertically articulatable bottom plate insertable between the cast and the body surface which on the interior of the cutter assembly forms a switch in series with a trigger switch connected to the main power. Two circular cutters, inclined relative each other, are disposed above and ahead of the bottom plate to open up a kerf therefor. The power to the cutters is transmitted through a pulley and gear combination to be driven by an electric motor. It is this electric motor that is series connected to the bottom plate switch and power will be applied to the cutters only upon upward urging of the cutter assembly.
U.S. Pat. No. 4,249,313
Inventor: Richard G. H. Bates
Issued: Feb. 10, 1981
A hand held portable pruning tool having a housing enclosing a motor one or more batteries and a saw blade. The saw blade is rotatable about an axis perpendicular to the axis of the housing. The blade is normally protected by a telescoping guard element having a forwardly extending notch for receiving a stem or limb to be cut. The telescoping guard element retracts into the housing in response to pressure exerted on the guard element in the direction of the stem thus bring the stem into contact with the blade and also energizing the motor.
Canadian Patent Number 1,161,797
Inventor: George A. Boyum et al.
Issued: Feb. 7, 1984
A tree-trimming apparatus mounted on a mobile support vehicle. The apparatus includes a telescoping boom pivotally mounted on a pedestal. The pedestal is pivotally mounted to a turntable which is rotatably mounted on the support vehicle. An operator's station is mounted on the pedestal to provide control of the apparatus. A large diameter circular saw is mounted at the end of the boom and is powered by a high speed hydraulic motor to provide high cutting efficiency. A fiberglass boom and electrically non-conductive hoses provide maximum safety for the operator.
Canadian Patent Number 1,225,307
Inventor: Douglas R. Mongeon
Issued: Aug. 11, 1987
An orbital saw for use in orthopedic applications such as cutting bones including a one-piece, externally mounted saw blade that can be quickly and easily replaced by unlocking a pair of bl
Kroll Michael I
Watts Douglas D.
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