Woodworking – Rotary cutter – Disk cutter including multiple clamping disks – tangential bit
Patent
1992-03-26
1993-11-09
Bray, W. Donald
Woodworking
Rotary cutter
Disk cutter including multiple clamping disks, tangential bit
83836, 83838, 144218, 144236, 407 31, B27G 1300
Patent
active
052594289
DESCRIPTION:
BRIEF SUMMARY
THIS INVENTION relates to cutting tools and in particular rotary cutters for the purpose of cutting and carving material.
Rotary cutters which are used in the woodworking industry to cut, shape and carve, and for cutting of aluminium in the boat building and fabrication industry and the like cutters all generally comprise a plurality of spaced teeth which are supported from a central hub. Such teeth are provided with a radial cutting edge which cuts material in a direction substantially transverse to the plane of rotation (hereinafter referred to as a transverse cut) or a transverse cutting edge which cuts material in a direction which is substantially radial to the central axis of rotation (hereinafter referred to as a radial cut) or can effect both a transverse and a radial cut. Throughout the present specification, the term "transverse" refers to a direction which is substantially transverse to the plane of rotation of the central hub of the rotary cutter, and the term "radial" refers to a direction which extends substantially radial to the axis of rotation of the central hub. It is also known with such cutters to provide fixed depth chip limiting guides (hereinafter referred to as guides) ahead of, and close to each of the teeth to limit the depth of cut which is effected by each tooth. Such guides have a fixed predetermined height whereby the maximum radial depth of cut is believed to be determined by the difference in the radius of the rotation path of the outer end (the tip) of the guide to the rotation path of the transverse cutting edge. Similarly, in the case of a radial cutting edge the maximum transverse depth of cut is determined by the difference between displacement of the plane of rotation of the outer portion of the guide and the plane of rotation of the radial cutting edge from the centre of the central hub.
Such cutters have been used in the past for carving and shaping wood, metal, plastics materials and the like and a form of one such cutter is disclosed in U.S. Pat. No. 4,850,407.
It is an object of this invention to provide a rotary cutter in which the depth of cut and cutting characteristics can be varied depending upon the requirements of its intended use.
In one form the invention resides in a rotary cutter, or carver, comprising a central member adapted to be mounted to a shaft for rotation therewith and supporting a plurality of teeth located at intervals around a circular path, each tooth having at least one cutting edge, a second member adapted to be mounted in association with the central member for rotation therewith and being capable of selective angular displacement, in relation to central member, said second member supporting a set of guides located at intervals around a circular path such that each guide is associated with one tooth of the plurality of teeth and is located ahead of said tooth.
According to a preferred feature of the invention the cutting edge is a transverse cutting edge and the radius of the rotation path of the guides is at most equal to the radius of the rotational path of the cutting edge.
According to a further preferred feature of the invention the cutting edge is a radial cutting edge and the degree of axial displacement of the plane of the rotation path of the outer edge of the guide with respect to the centre of the first member is at most equal to the degree of axial displacement of the plane of the rotational path of the radial cutting edge, to vary the depth of the transverse cut.
According to a further preferred feature of the invention the second member is displaceable axially with respect to the teeth to vary the spacing between the plane of the rotation path of the guide and the plane of the rotation path of the cutting edge to vary the transverse cut depth.
According to a preferred feature of the invention the spatial relationship between each guide and its respective tooth is substantially constant.
In another form the invention resides in a rotary cutter comprising a central member adapted to be mounted to a shaft for rotation therewit
REFERENCES:
patent: 2477153 (1949-07-01), Succop
patent: 2659398 (1953-11-01), Marvin
patent: 5090287 (1992-02-01), Chezem
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