Cutlery – Cutting tools – Saw
Patent
1996-07-08
1998-03-10
Peterson, Kenneth E.
Cutlery
Cutting tools
Saw
30388, 8369861, 83863, B23D 4708
Patent
active
057247404
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
Portable twin blade saws are known to have advantages in cutting certain materials such as double sided melamine or wood veneers. However, difficulties can arise in portable twin blade saws if the blades are not aligned properly. Typically, cuts are made with a hand-held twin blade saw by moving the saw across a material to be cut whilst an edge of the saw is passed along a straight edge. Typical mis-alignments include the two saw blades not being co-planar and the saw blades not being parallel to the edge of the twin bladed saw. Further, it is desirable to be able to adjust the height of both blades so that a variable depth of cut can be achieved.
The present invention seeks to provide a portable twin bladed saw which provides adjustment for each of the above types of misalignment.
SUMMARY OF THE INVENTION
According to one aspect of the present invention, there is provided a portable twin blade saw comprising a main base having a slot formed therein, a frame base pivotally attached to the main base and having an apertured section, a member having an aperture formed therein, the member being slidably mounted to the apertured section, an arm and first and second saw blades, the first saw blade being mounted in the aperture of the member and a first aperture of the arm such that the arm pivots about a centre of the first aperture, the second saw blade being mounted in a second aperture of the arm, a driving means arranged such that the first and second saw blades are in driving communication therewith and a motor arranged to drive the first and second saw blades via the driving means.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is an exploded perspective view of the frame of a portable twin blade saw according to the present invention;
FIG. 2 is a top plan view, with the motor partially broken away, of a portable twin blade saw according to the present invention;
FIG. 3 is a side plan view of the portable twin blade saw shown in FIG. 2;
FIG. 4 is a cross-sectional view through section A-A in FIG. 3:
FIG. 5 is a side plan view of the locking pin shown in FIG. 4; and
FIG. 6 is a perspective view of the knife arrangement of the portable twin blade saw of FIG. 2.
DESCRIPTION OF THE INVENTION
In the drawings there is shown a portable twin blade saw 10 comprising in part a main base 12, a frame base 14, member 16 and an arm 18. The main base 12 has a slot 20, arcuate slots 22 (not shown) and an aperture 24 (not shown) formed therein. The frame base 14 has apertures 26 and an aperture 28 formed therein. The frame base 14 includes a section 30 having an aperture 32 and slots 34 formed therein and a further section 36 having an aperture 38 formed therein.
The member 16 has an aperture 40 and apertures 42 formed therein. The arm 18 has apertures 44,46,48,50,52 and an arcuate slot 54 formed therein.
The main base 12 has tubular members 56 and 57 attached at opposing sides thereof. A clamp 58 is attached to each of the members 56 and 57. A fence 60, comprising a member 62 and a pair of rods 64 attached to the member 62 in a spaced apart manner, is attached to the main base 12 by means of the rods 64 being engaged by the clamps 58. The frame base 14 is attached to the main base 12 by a bolt passing through the aligned apertures 24 and 28. Further, each of the apertures 26 is then aligned with one of the arcuate slots 22. A bolt passes through each aligned aperture 26 and arcuate slot 22. The first section 30 and the second section 36 extend outwardly from the main base 12 when the frame base 14 is attached thereto. The member 16 is slidably mounted to the first section 30 by bolts passing through the apertures 42 and slots 34.
A gear 66 and a first saw blade 68 are mounted on a shaft 70. The shaft 70 extends through the aperture 44 of the second member 18, the aperture 32 of the first section 30 and the aperture 40 of the member 16. The first saw blade 68 is substantially ali
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patent: 5136910 (1992-08-01), Kuhn et al.
patent: 5148732 (1992-09-01), Striebig
patent: 5159870 (1992-11-01), Fiala
patent: 5287786 (1994-02-01), Fiala
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