Wood turning – Turning tools
Patent
1997-06-25
1998-12-22
Bishop, Steven C.
Wood turning
Turning tools
407 4, B27C 700, B27G 1500
Patent
active
058508600
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to cutting means. In particular, one preferred form of the invention relates to a cutting tool for use in wood turning.
BACKGROUND ART
It is known in the art to use tools which comprise a sharp blade for fashioning a piece of wood as it spins on a lathe. However, a problem with many known tools is that they have a blade construction with insufficient strength, and hence blade breakage is an all too common occurrence. Additionally, some known tools have a very limited cutting capacity, or are prone to inconvenient blockage by wood shavings. It is therefore an object of at least one embodiment of the present invention to go at least some way towards overcoming the above problems.
DISCLOSURE OF INVENTION
According to one aspect of the invention there is provided cutting means comprising a support portion and a blade portion, the blade portion being in the form of at least one closed curve or loop and having a cutting edge extending at least partially around the closed curve or loop.
In one embodiment of the invention the cutting means comprises clearance means, the cutting means being formed such that when it is used to cut an object the clearance means is suitable for use in clearing cuttings from the object away from an area adjacent the blade portion.
Preferably the clearance means comprises a deflecting portion which can be arranged adjacent the blade portion to deflect cuttings away from the blade portion.
In one alternative embodiment of the invention the clearance means comprises an aperture which can receive an implement for pushing cuttings away from the blade portion.
In another embodiment of the invention there is provided cutting means according to any one of the four immediately preceding paragraphs, comprising adjustment means for regulating the cutting capacity of the blade portion.
Preferably the adjustment means comprises cover means which can be reversibly moved over or across at least part of the blade portion.
Preferably the cover means comprises a cover cap and a stem.
In a further embodiment of the invention there is provided cutting means according to any one of the seven immediately preceding paragraphs, wherein the cutting edge has varying degrees of curvature as it extends at least partially around the closed curve or loop.
Preferably the blade portion is in the form of two closed curves or loops, each closed curve or loop having a cutting edge extending at least partially around the closed curve or loop.
Preferably any one of the cutting edges can be arranged in a position suitable for cutting, but both cutting edges can not be in the position suitable for cutting at the same time.
Preferably the cutting edges are offset from a support plate.
In some embodiments of the invention the closed curve or loop comprises at least one substantially straight part. In some embodiments of the invention all parts of the loop may be straight.
Some preferred embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, of which:
FIG. 1 is a side cross-section view of an adjustable wood turning tool,
FIG. 2 is an end elevation view of the tool shown in FIG. 1,
FIG. 3 is a plan view of a blade which forms part of the tool shown in FIG. 1,
FIG. 4 is an upper plan view of a blade cover which forms part of the tool shown in FIG. 1,
FIG. 5 is a side elevation view of the blade cover,
FIG. 6 is a front end elevation view of the blade cover, and
FIG. 7 is a perspective view of the adjustable wood turning tool.
With reference to FIGS. 1 and 3, the adjustable wood turning tool comprises a handle portion 1 which supports a cutting portion 2. The cutting portion 2 includes a blade 3 which is formed from a plate 4 supporting two closed curve cutting edges 5a and 5b. As shown, the closed curves are not circular, but rather have varying degrees of curvature. The plate 4 is secured to the rest of the cutting portion 2 such that only one of the cutting edges 5a or 5b is in a suitable position (the cutting position
REFERENCES:
patent: 419873 (1890-01-01), Palmer
patent: 2101379 (1937-12-01), Zackowitz
patent: 2986177 (1961-05-01), Markin
patent: 4126165 (1978-11-01), Guignard et al.
patent: 4284111 (1981-08-01), Petersen et al.
patent: 4754787 (1988-07-01), Smith
J. Blackwood & Son Limited, Blackwoods General Catalog, 1979, p. 214, Macarthur Press Pty. Limited, Australia.
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