Note: Descriptions are shown in the official language in which they were submitted.
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IN''TiElk APPLICATION'dF IdNATHAN AND REBECCA RITTER FOR A
TUNGSTEN CARBIDE TOOL
Field of the Invention
The present invention is a device that is designed to fif a reciprocating tooL
Background of the Invention
Reciprocating tools are used to move an attachment to and fro. The standard
reciprocating saw blade cannot cut objects that are very hard without the
blade being
dulled extremely quickly. Moreover, standard reciprocating tool attachments
cannot
contort and return to a desired form easily.
There exist blades for cutting wood, and there are those blades that exist for
cutting steel. However, there is a need for a blade that is capable of cutting
concrete,
mortar, DUROC type material or even some of the harder plastics used in
construction.
Further, there is a need for such blade to be automated. Tungsten carbide has
been used
for many different applications; however, when cutting with a reciprocating
tQol, the
speed and the stresses call for a refinement of tungsten carbide technology.
Further, there exist reciprocating tool attachments, but none that easily
change
shape to access various areas, and then are capable of returning to their
original shape.
In the industry, a circular blade with a diamond tip is used for cutting
concrete,
mortar, DUROC type material or even some of the harder plastics used in
construction.
However, the diamond tip blades are very expensive; circular saws cannot
penetrate the
concrete, mortar, DUROC type material or even some of the harder plastics used
in
construction deeply; circular saws are not terribly maneuverable - they are
intended for
cutting in a straight line. Thus, there is a need for a blade that is
automated, and also
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capable of cutting concrete, rnortar, DUROC type material or even some of the
harder
plastics used in construction, and also maneuverable.
Further, when a cut is made into concrete, mortar, DUROC type material or even
some of the harder plastics used in construction, there it is desirable to
smooth the surface
of the cut while the cut is being made, rather than having to smooth in a
separate pass or
step.
Also, there is a need to cut concrete, mortar, DUROC type material or even
some
of the harder plastics used in construction faster than a diamond-tipped
circular blade.
Summary of the Invention
The present invention is a rasp made of Tungsten Carbide that is configured to
fit
onto a conventional reciprocating tool. Tungsten Carbide is an extremely hard,
fine gray
powder whose composition is WC. It is used in tools, dies, wear-resistant
machine parts,
and abrasives. The present invention is able to cut through some of the
hardest material
available to contractors, such as concrete, mortar, and hard plastics.
An alternative embodiment of the present invention provides memory plastic as
a
base material as opposed to steel.
It is an object of the present invention to combine tungsten carbide with a
reciprocating tool so that the tool may be able to cut through most any hard
construction
material.
It is a second object of the present invention to allow a user to sand and
smooth
the cut being made with the actual tungsten carbide attachment to the
reciprocating tool
itself.
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It is a third object of the present invention to allow for a tungsten carbide
tool that
is fully automated by being attached to a reciprocating tool.
It is a final object to allow a regular homeowner to use the tool to cut
through
heavy material using a conventional reciprocating tool. It would be a softer
cut with the
present invention, and would obviate the need for sandpaper. The main body of
the
present invention fits into a reciprocating tool that has tungsten carbide or
a similar
substance that is sufficiently hard to be able to cut through a hard material;
to have that
substance housed on the attachment for the reciprocating tool. Conventionally,
reciprocating tools are used with a saw insert wherein the insert has a blade
on one end,
or teeth, which will be moved to and fro, mimicking the manual motion done by
a user
with a standard saw.
These together with other objects of the invention, along with the various
features
of novelty, which characterize the invention, are pointed out with
particularity in the
claims annexed to and forming a part of this disclosure. For a better
understanding of the
invention, its operating advantages and the specific objects attained by its
uses, reference
should be had to the accompanying drawings and descriptive matter in which
there is
illustrated preferred embodiments of the invention.
Brief Description of the Accompanying Figures
The invention will be better understood and objects other than those set forth
above will become apparent when consideration is given to the following
detailed
description thereof. Such description makes reference to the annexed drawings
wherein:
Figure 1 is an environmental view of the present invention.
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"Figu"re"2 is atso ari envi'roninental view of the present invention in an
alternative
embodiment.
Detailed Description
As shown in Figure 1, the first step is to make sure that the key 10 is
continuous
with the actual paddle 40 or material that will be the tool. It should be one
continuous
piece. Next, the tungsten carbide 31 or similarly hard material is adhered to
the paddle
40. To do so, 1095 steel is heated to 2000 degrees and the tungsten carbide at
that
temperature is braised to the key 10 - it is considered a paddle 40 when the
key 10 is
lengthened. After that process, the metal is annealed, making it very soft.
"Annealing" a
metal is to subject it to a process of heating and slow cooling in order to
toughen the
metal and reduce brittleness. Conventional methods are used to braise the
tungsten
carbide 31 or similarly hard substance to the paddle 40. The tungsten carbide
31 used in
the present invention ranges from 24 grit (very rough) to 220 grit (very
fine). The tool
can be used to cut masonry block, tile, and concrete. Tungsten carbide grit
applies to
1095 or 4140 steel alloy key 10. It is similar to the key used to insert into
a conventional
saw. Preferably, the key 10 is lengthened to ten inches in length (although it
can be any
length). The key 10 is treated so that it is sufficiently hard to withstand
the pressure when
the device is used. This requires the key 10 be re-heated back up to a 44-48
RCH
rockwell hardness (1600 degree area). If it's much above or below that range,
then the
key 10 will break or bend. The key 10 is then oil quenched. Oil quenching is
done to
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~5&'it ds 'bpo"s'e(T"to v~fate"r=''c''oo7irig, which is too sudden and would
cause the metal of
the key 10 to become brittle.
Preferably, the tungsten carbide 31 can be attached to paper strips 32 and
then
attached to the paddle 40 via hook and loop method 33. Figure 1 shows the
preferable
embodiment of the present invention. This method allows the sand paper to be
thrown
away. However, as it is attached to paper, the tungsten carbide does not last
as long as
when it is attached directly to the metal of the key 10. The tungsten carbide
adheres to
the paper via conventional technology. The strips of paper would be preferably
via loop-
type fasteners or any conventional technology. The loop-type fasteners are
adhered to the
paddle 10. In other words, one hook and loop-type fastening surface 33 is
wrapped
around and adhered to the paddle 40. A corresponding fastener is adhered to
the paper-32
via conventional means. The key 10 is the segment that attaches to the
reciprocating tool;
bare steel 20 and tungsten carbide 31 on removable paper strips 32 comprise
the paddle
40. The benefit of this embodiment is as the tungsten carbide 31 is gradually
worn down
from use, rather than buying a new key 10 and paddle 40 with tungsten carbide
31, all the
user would have to do is buy a replacement tungsten carbide 31 paper 32 with
hook and
loop fasteners 33.
In an alternative embodiment, as shown in Figure 2, the paddle 41 is made of
bare
steel 21 and tungsten carbide 31, which is not removable from the paddle 41.
Tungsten Carbide grits will cut ready mix, which is one of the hardest
substances
that a contractor might desire to cut. Use 80 to 120 grit for tile; for DUROC
type
material, use 36 to 40 grit. It should be understood that the smaller the
grit, the harder the
material that can be cut. It should also be understood that although a larger
grit will cut
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fhahy"6f ln6'pld'sfiC ;'"a"sh'raller grit is preferable in order to have a
smooth finish. When
the grit is changed, the heating temperature (as noted above) will vary so
that as the grit
size increases, the temperature requirement must go up to achieve the correct
consistency
and hardness. Because there are certain stress areas coming into contact with
surfaces, the
present invention is super-hardened so that it won't snap or break.
Instead of the metal, another embodiment for the paddle 40 / 41 could be
memory
plastic so that it is malleable for working with any surface that requires a
non-planar
surface-.to interact with it. In this embodiment, memory plastic would form
the paddle and
be melted to form around the key 10 to make one continuous piece. The Tungsten
carbide
31 can also be glued directly to memory plastic. It is anticipated that this
embodiment
would not be able to withstand the pressures as the other embodiment. The
nature of
memory plastic is that it can be bent and return to its original form as
opposed to a steel
key which is not as flexible.
A final embodiment is the memory plastic paddle 41 with hook and loop type
fasteners, with the Tungsten carbide on the paper that mates with the hook and
loop
fastener.
With respect to the above description then, it is to be realized that the
optimum
dimensional relationships for the parts of the invention, to include
variations in size,
materials, shape, form, function and manner of operation, assembly and use,
are deemed
readily apparent and obvious to one skilled in the art, and all equivalent
relationships to
those illustrated in the drawings and described in the specification are
intended to be
encompassed by the present invention.
Therefore, the foregoing is considered as illustrative only of the principles
of the
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iiw6rftiM. P'ui'tbershicenurii'i~r'bV~"'modifications and changes will readily
occur to those
skilled in the art, it is not desired to limit the invention to the exact
construction and
operation shown and described, and accordingly, all suitable modifications and
equivalents may be resorted to, falling within the scope of the invention.
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