Note: Descriptions are shown in the official language in which they were submitted.
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Patent Application "'~°--~--
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Andre Martel -
AvR 101996'
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WOOD TURNING TOOL
BACKGROUND OF THE INVENTION
The present invention relates to the field of wood turning tools and more
particularly, relates to a hand held wood turning tool for allowing an
intended user to cut
a turning workpiece in a variety of configurations.
BACKGROUND - PRIOR ART
The field of wood turning tools is replete with a variety of tools which can
be used to shape wood workpieces.
Whenever a workpiece needs to have a recess formed therein, cutting tools
such as chisels and gouges as well as scraping tools are used to permit rapid
rough cutting
and scraping followed by a more careful fine surface finishing of the wood
surface in order
to form an article having a recess therein.
In using these tools, a cutting edge is usually pushed into the wood fibers
to force their severing and, particularly in the process of end-grain
hollowing of wood
pieces, that pushing occurs against or across the grain of the wood. The use
of such a
technique requires considerable expertise and concentration on the part of the
tool-turner
in order to minimize ragged tearing of the wood fibers or even more serious
gouging of
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the wood.
In order to circumvent the above mentioned disadvantages, a wood turning
tool has been proposed and is disclosed in U.S. Patent 4,754,787. Although
relatively
efficient, the tool described in the above mentioned patent suffers from at
least one
drawback. While, this type of tool is particularly useful for forming
hemispherical hollow
shapes, it is not very well adapted to form oval or other shapes which are
often desired.
Accordingly, it is an object of the present invention to provide a wood
turning tool which is suited to form recesses in wood articles such as bowls,
goblets,
canisters and other containers.
It is another object of the present invention to provide a tool which
optimizes
the wood turning procedure.
It is a further object of the present invention to provide a wood turning tool
in accordance with the previous objects which will conform to conventional
forms of
manufacturing, be of simple construction and easy to use, as well as to
provide a wood
turning tool which will be economically feasible, long lasting and relatively
trouble- free
in operation.
According to one aspect of the present invention, there is provided a wood
turning tool comprising a shank portion and a cutting head, the cutting head
having, a first
arcuate portion and a second arcuate portion, the shank portion having a
longitudinal axis,
the first arcuate section having a longitudinal axis which is arcuate and lies
in a first plane
which is angled with respect to a plane along the longitudinal axis of the
shank portion,
a second arcuate section merging with the first arcuate section, the second
arcuate section
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having a longitudinal axis which is arcuate and which axis lies in a second
plane which is
angled with respect to the shank longitudinal axis plane and the first plane,
the first and
second arcuate segment having first and second cutting edges, the first and
second cutting
edges being on substantially opposed sides of the cutting tool.
In a further aspect of the invention there is provided a wood turning tool
comprising a longitudinally extending member having a shank section, a first
arcuate
section, and a second arcuate section, the shank portion having a longitudinal
axis, the first
arcuate section having a longitudinal axis which has a concave configuration,
the second
arcuate segment merging with the first arcuate segment, the second arcuate
segment having
a longitudinal axis of a generally U-shaped configuration, the longitudinal
axis of the
second arcuate section being angled with respect to the longitudinal axis of
the first arcuate
section, and first and second cutting edges located proximate a point where
the first and
second arcuate sections merge.
In greater detail, the wood turning tool has a shank portion with a cutting
head at one end of the tool shank. As will be appreciated, many arrangements
are possible
including a relatively short shank portion connected to a handle or other
suitable member.
Normally, the shank will have a substantial length although this is not an
essential part of
the invention. A convenient arrangement would be one wherein the shank and
cutting head
are formed as a single unitary member.
The cutting head will provide for two different cutting edges, with the
cutting edges being in a somewhat opposed relationship to each other as will
be described
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in the preferred embodiments hereinbelow.
The tool may be formed of any suitable material which is adapted for the
purpose. Traditionally, a suitable steel material such as a hardened tool
steel which can
be sharpened.
The cutting head tool of the present invention, as above described, includes
a first arcuate section which has a somewhat U-shaped or concave configuration
when seen
from a side elevational view. It will be understood that although the shank
and cutting
head can have various cross sectional configurations, when reference is made
to the
longitudinal axis, it is employed in the general sense in that the shank and
cutting head
both have an axis extending in the longitudinal direction of the elongated
tool.
The cutting head has a second arcuate section which is a continuation of the
first arcuate section; the second arcuate section extends in a direction which
is different
from the first arcuate section. The second arcuate section
may have a somewhat sharper cross sectional profile than the first arcuate
section.
The angles of the arcuate sections can be changed so as to provide a desired
effect. Thus, one could have a different angle such that the tool is
specifically designed
for forming a recess of different configurations as will be described
hereinbelow.
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus generally described the invention, reference will be made to the
accompanying drawings illustrating an embodiment thereof, in which:
Figure 1 is a partial perspective view illustrating a wood turning tool having
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a shank and cutting head in accordance with an embodiment of the present
invention;
Figure 2 is side elevational view of the cutting head of the tool of Figure 1;
Figure 3 is a bottom view, of Figure 2;
Figure 4 is a cross-sectional view taken along arrows 4-4 of Figure 3;
Figure 5 is a rear view of Figure 2;
Figure 6 is a top view of Figure 2;
Figure 7 is a partial cross-sectional view,
illustrating a wood turning tool in accordance with the present invention
being used to
carve a recess in a wood article;
Figure 8 is a perspective view illustrating use of a wood turning tool as
shown in Figure 7;
Figure 9 is a partial cross-sectional view, similar to Figure 7 illustrating a
wood turning tool in accordance with the present invention;
Figure 10 is a perspective view illustrating use of the wood turning tool in
accordance with the embodiment of Figure 9;
Figure 11 is a partial cross-sectional view similar to Figure 7, illustrating
use of a wood turning tool in accordance with the present invention;
Figure 12 is a perspective view, illustrating use of the wood turning tool in
accordance with the embodiment of Figure 11;
Figure 13 is a cross sectional view of a carved article formed with the tool
of the present invention;
Figure 14 is a side elevational view similar to Figure 2 of a modified tool
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according to the present invention;
Figure 15 is a partial cross sectional view illustrating use of the tool of
Figure 14;
Figure 16 is a side elevational view of a still further embodiment of the
cutting head of a tool; and
Figure 17 is a partial cross sectional view illustrating use of the tool of
Figure 16.
DETAILED DESCRIPTION OF THE INVENTION
Referring to Figure 1, there is shown a wood turning tool 10 in accordance
with an embodiment of the present invention. The wood turning tool 10 has a
substantially
elongated shank 12 which has generally circular cross-sectional configuration.
Tool shank
12 has a longitudinally extending shank longitudinal axis A. Tool shank 12 has
a proximal
end 14 and a distal end 16. Proximal end 14 may be conventionally attached to
a
conventional wood turning handle (not shown) which is grasped by the wood
turning
operator during use.
A cutting head section 18 is formed integrally with and merges with distal
end 16 of shank 12. As seen in Figures 2, 3, 5 and 6 the cutting head has a
first arcuate
segment generally designated by reference numeral 22 and which has a generally
concave
configuration. Arcuate segment 22 in turn merges with a second arcuate segment
24 which
has an overall U-shaped configuration.
When seen from the side, as illustrated infigures 2 and 5, the cutting head
section 18 has a substantially "V"-shaped configuration. The cutting head
section 18 also
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has a distal end surface 20. The distal end surface 20 is angled relatively to
the shank
longitudinal axis A. The shank longitudinal axis A extends substantially
centrally accross
the distal end surface 20.
When seen from the top and bottom, as illustrated respectively in Figures
6 and 3, the cutting head 18 has a substantially U-shaped configuration
forming arcuate
segment 24. The configuration of segment 24 influences the type of hollow
shapes which
can be formed into the wood being carved. For example, a generally U-shaped
configuration such as the one illustrated in Figure 3 of the segment 24 will
allow for a
substantially U-shaped wall to be formed in the hollowed article, whereas a
substantially
V-shaped segment would allow for a more obtuse angle of the hollowed-out
portion.
As illustrated in Figures 2 and 5, the width T of the blade can influence the
shape of the hollowed out segment in the wood. In this respect, the cutting
head has a first
sharpened edge 26 and a second sharpened edge 28 at the distal end of the
bottom edge
located proximate the point of merger of arcuate segments 24 and 22.
Edge 26 is used in a pushing action as illustrated in Figures 7 and 8 to take
into the wood in order to form a central recess which will be widened by a
subsequent
pulling action as illustrated in Figures 9 and 10 wherein cutting edge 28 is
employed.
The cutting action is performed simultaneously with a rotation of the tool
along its longitudinal axis as indicated in Figures 11 and 12.
As shown in Figures 13, 15 and 17, a variety of different shapes of recesses
can be formed utilizing the tool of the present invention.
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As previously mentioned, the bottom wall of the arcuate section may have its
angle varied as shown in Figures 14 and 16 in order to give a desired
configuration.
It will be understood that the above described embodiments are for purposes of
illustration only and that changes and modifications may be made thereto
without departing from
the spirit and scope of the invention.
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