Cutlery – Cutting tools – With guard and/or guide
Patent
1993-10-12
1995-10-10
Peterson, Kenneth E.
Cutlery
Cutting tools
With guard and/or guide
305035, B26B 1900
Patent
active
054560110
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an improved cutting tool of the general type including a plurality of cutting teeth arranged along the edge of a member and generally referred to as a saw.
A range of cutting tools or saws are known wherein the cutting teeth are arranged along the straight edge of an elongate member or about the peripheral edge of a circular member. These saws are used for cutting a variety of materials although it is customary to provide individual cutting tools for respective groups of materials such as wood, metal and concrete or stone.
It is the principal object of the present invention to provide a cutting tool incorporating a plurality of cutting teeth along an edge of a member and wherein the cutting tool has improved performance in cutting a wide range of materials.
With this object in view, there is provided a cutting tool comprising two cutting members positioned side by side and each having a toothed cutting edge of substantially the same shape, each cutting member being drive coupled to a motor so the cutting edge thereof prescribes simultaneously in the plane of the toothed edge, simultaneous oscillatory movements in the direction of the toothed edge and in the direction at right angles thereto, said corresponding movements of the respective cutting members being out of phase, and the teeth of each cutting edge being adapted to each cut when moving individually in the direction of the toothed edge.
As a result of the cutting members being subject to simultaneous oscillatory movements in two directions, each tooth on the respective cutting member describes an oval or elliptical-like path so that during one half of the path the teeth engage the material to be cut and performs a cutting action, and during the other half, the tooth is lifted clear of the material being cut as the cutting element performs a return movement. As the oscillatory motions of the respective cutting members are out of phase, and preferably 180.degree. out of phase, the teeth on one cutting member will be cutting the material whilst the teeth of the other member are undergoing the return movement. Conveniently, the toothed edge of each cutting member is of a curved, possibly arcuate, shape, and preferably at each end of the cutting member there is portion of the cutting edge which is more sharply curved than the major portion of the cutting edge.
Conveniently the pitch of the teeth on the cutting edge is less than the extent of oscillatory movement in the direction of the cutting edge, so that there is an overlap in the cutting movement of each adjacent tooth, whereby no part of the material being cut within the length of the cutting edge is not subject to a cutting action in each cycle of movement of the cutting members.
The required motion of the respective cutting members is obtained by rotatably supporting the cutting members on respective eccentric journals of a shaft rotatably driven by a motor. The cutting members are also pivotally connected to a link at a location spaced from the shaft axis and with a pivot axis parallel therewith. The pivot axis of the cutting members is spaced from the axis of the drive shaft so that as the drive shaft rotates, the cutting element will undergo an oscillatory motion about the pivot axis thereof, and that pivot axis will move substantially linearly in a direction generally normal to the direction of oscillation.
Expressed another way, the cutting member will oscillate about the pivot axis whilst that pivot axis will move substantially,linearly along a line between the pivot axis and the axis of the drive shaft. The movement of the cutting member pivot axis provides the movement which cyclically lifts the cutting teeth out of engagement with the material to be cut, whilst the oscillatory motion performs the cutting and return actions of the cutting edge of the cutting member. As the oscillatory movements of the respective cutting members are out of phase, one cutting member is performing a cutting stroke while the other is on a return stroke.
The invention will be more rea
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Arbortech Investments Pty. Ltd.
Peterson Kenneth E.
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