Note: Descriptions are shown in the official language in which they were submitted.
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BLADESET FOR HAIR CLIPPERS INCLUDING
BLADE WITH HAIR EVACUATION CONFIGURATION
This invention relates to bladesets for hair clippers, and more
particularly, to clipper bladesets including a reciprocating moving cutting
blade and
a stationary blade upon which the moving blade reciprocates, and wherein at
least one
of the blades is provided with a configuration which promotes the evacuation
of hair
clippings and/or hair from the cutting area of the bladeset, and facilitates
the flow of
hair away from the cutting area.
Electric hair clippers are well known in the art, and generally include
a bladeset having a stationary blade and a moving blade. Each of the blades
has a row
of spaced teeth arranged so that hair strands which enter between the teeth of
the
stationary blade are cut when the teeth of the moving blade pass across the
stationary
blade teeth.
A common drawback of conventional hair clippers is that the hair
clippings generated from the cutting action of the blades collect in the
cutting area of
the blades and become caught and/or clogged between the blades. As the hair
clippings accumulate in the cutting area, a process which is exacerbated when
cutting
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wet hair, the cutting action of the blades is impaired. Also, the subject's
hair still
attached to the scalp may also become clogged, snagged, or impair the
operation of
conventional clipper blades.
One attempt to solve this problem has been to mill or machine v-shaped
grooves between the teeth of the stationary blade. Due to the shortcomings of
conventional milling and machining techniques, these grooves tend to act like
a fiumel
and do not provide sufficient avenues for escape of the hair and/or hair
clippings.
Thus, there is a need for a hair clipper bladeset which effectively
facilitates the
evacuation of a significant portion of hair and/or hair clippings from the
cutting area
of the bladeset.
Another drawback of conventional bladesets is the configuration of the
individual teeth, which is also due in part to the limits of available milling
or grinding
technology. By design, each tooth has a designated rake angle, or the angle of
slope
of the side of the tooth from a relatively wide base or root, to a relatively
narrow upper
ridge or crown. The advantages of a large rake angle or a more gradual slope
are that
a sharper side edge is obtained, which is better for precise cutting. However,
because
of the narrow thickness of the blades; a larger rake angle results in a wider
base for
the tooth. Such a wider base makes it difficult for hair to feed through for
cutting.
In addition, a sharper edged tooth is more easily damaged through use
and dulls faster. Lastly, and again due to the relatively narrow thickness of
the
individual teeth, a larger rake angle results in a relatively narrow crown.
Narrow
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crowns are easily damaged through normal manufacturing, and have been known to
physically crumble or otherwise deteriorate due to insufficient thickness.
In the case of stationary blades, to promote the feeding of hair into the
cutting area, the tip is desired to be thinner than the root, when viewed from
above,
and as such, the root is expected to be thicker than the tip. In addition, an
overly thin
root means that the rake angle cannot be too large, for fear of making the
crown too
thin and weak.
Thus, the decision of a specific, designed rake angle for a clipper tooth
is a compromise of the above-listed factors. Even so, due to the limitations
of
conventional grinding, milling and machining technology, it is almost
impossible to
produce clipper teeth having the desired rake angle throughout a portion of
their
length near the cutting area, and also in the tooth height from base to crown.
In fact,
the rake angle of production teeth often varies depending on the point on the
tooth
where the angle is measured. This results in clipper teeth with less than
optimal
performance characteristics.
Accordingly, a first object of the present invention is to provide an
improved blade for a hair clipper bladeset which is designed to prevent the
accumulation and clogging of hair and/or hair clippings in the cutting area,
which
promotes the evacuation of clippings from the cutting area and promotes the
flow of
the user's remaining hair away from the blades.
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Another object of the present invention is to provide an improved blade
for a hair clipper bladeset which has a uniform rake angle at least along its
length in
the cutting area.
Still another object of the present invention is to provide an improved
bladeset for a hair clipper in which the teeth of the stationary blade are
configured to
prevent pinching of the skin.
Accordingly, a first embodiment of the present invention involves a
blade for use in a hair clipper provided with a bladeset including a moving
blade and
a stationary blade, the bladeset being constructed and arranged so that the
moving
blade is pressed against the stationary blade to allow the moving blade to
reciprocate
relative to the stationary blade in a transverse direction to a longitudinal
axis of the
clipper, the blade comprising a base portion having a tooth end, and a
mounting end
opposite the tooth end, a plurality of teeth arranged in spaced, parallel
relationship to
each other and proj ecting from the tooth end in a direction parallel to the
longitudinal
axis of the clipper, each tooth having a tip, a root opposite the tip and
being joined to
the tooth end, the roots joined to the tooth end in spaced relationship to
each other to
define generally planar-floored channels between the roots for facilitating
the
evacuation of hair clippings from the bladeset and the flowing of hair past
the roots.
A second embodiment of the present invention involves a blade for use
in a hair clipper provided with a bladeset including a moving blade and a
stationary
blade, the bladeset being constructed and arranged so that the moving blade is
pressed
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against the stationary blade to allow the moving blade to reciprocate relative
to the
stationary blade in a transverse direction to a longitudinal axis of the
clipper, the blade
comprising a base portion having a tooth end, and a mounting end opposite the
tooth
end, a plurality of teeth arranged in spaced, parallel relationship to each
other and
projecting from the tooth end in a direction parallel to the longitudinal axis
of the
clipper, the base portion having a portion of constant radius beginning at the
tooth end
to define a transverse hump for facilitating the evacuation and/or flow of
hair and/or
hair clippings away from the tooth end.
A third embodiment of the present invention involves a blade for use in
a hair clipper provided with a bladeset including a moving blade and a
stationary
blade, the bladeset being constructed and arranged so that the moving blade is
pressed
against the stationary blade to allow the moving blade to reciprocate relative
to the
stationary blade in a transverse direction to a longitudinal axis of the
clipper, the blade
comprising a base portion having a tooth end, and a mounting end opposite the
tooth
end, a plurality of teeth arranged in spaced, parallel relationship to each
other and
projecting from the tooth end in a direction parallel to the longitudinal axis
of the
clipper, each tooth having a tip, a root opposite the tip and being joined to
the tooth
end, and each tooth having a constant rake angle at least in a cutting area
near the
tooth end.
The above objects are met or exceeded by the present bladeset for a hair
clipper, in which the blade teeth are arranged on the blade base to facilitate
the
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passage of hair and/or hair clippings away from the cutting area. Each tooth
has a root
which is disposed on the blade in spaced relationship from the adjacent teeth
by a
generally planar channel. This channel defines a space through which the hair
and/or
hair clippings may more freely flow than in prior stationary blade
configurations. In
addition, each tooth is provided with backstriping which further defines the
widened
planar channel, and promotes the passage of hair and/or hair clippings away
from the
cutting area so that the blades are not clogged with hair. Also, each tooth
has a
uniform rake angle along its length in the cutting area, as well as along a
desired
portion of its height. Another feature of the present bladeset is that the
blade has
I O teeth which are fully radiused except for the cutting blade edges to
prevent pinching
or snagging of the skin.
More specifically, a blade is provided for use in a hair clipper having
a bladeset including a moving blade and a stationary blade, the bladeset being
constructed and arranged so that the moving blade is pressed against the
stationary
blade for allowing the moving blade to reciprocate relative to the stationary
blade in
a transverse direction to a longitudinal axis of the clipper. The blade
includes a base
portion having a tooth end, and a mounting end opposite the tooth end, a
plurality of
teeth arranged in spaced, parallel relationship to each other and projecting
from the
tooth end in a direction parallel to the longitudinal axis of the clipper,
each tooth
20 having a tip, a root opposite the tip and being joined to the blade end.
The roots are
joined to the blade end in spaced relationship to each other to define
generally open
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or planar-floored channels between the roots for facilitating the evacuation
of hair
and/or hair clippings from a cutting area of the bladeset, and the flowing of
hair past
the roots. The present bladeset also features a base with a constant radius
portion or
transverse hump, and a tapered tooth configuration on at least the stationary
blade to
further facilitate the evacuation of hair clippings.
The above-mentioned and other features of the invention and the manner
of obtaining them will become more apparent, and the invention itself will be
best
understood by reference to the following description of an embodiment of the
invention taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a vertical sectional view of a hair clipper of the type suitable
for accommodating the present bladeset;
FIG. 2 is a bottom plan view of a prior art stationary blade of a. clipper
bladeset;
FIG. 2A is a cross-section taken along the line A-A of FIG. 2 and in the
direction indicated generally;
FIG. 2B is a cross-section taken along the line B-B of FIG. 2 and in the
direction indicated generally;
FIG. 3 is a side elevational view of the blade of FIG. 2;
FIG. 4 is a bottom plan view of the stationary blade of the present
bladeset;
FIG. 4A is a sectional view taken along the line A-A of FIG. 4;
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FIG. 5 is a fragmentary top plan view of the stationary blade of FIG.4;
FIG.6 is an enlarged fragmentary bottom plan view of the blade as shown
in FIG. 4;
FIG. 7 is enlarged fragmentary top plan view of the stationary blade of
FIG. 4;
FIG. 8. is a top plan view of the present stationary blade;
FIG. 9 is a side elevational view of the blade of FIG. 8;
FIG. 10 is a sectional view taken along the line 10-10 of FIG. 4 and in
the direction indicated generally;
FIG. 11 is a bottom plan view of an alternate embodiment of the present
stationary clipper blade; and
FIG. 12 is an overhead plan view of a moving blade which is suitable for
use with the present bladeset.
Referring now to FIG. 1, an electric hair clipper, generally designated 10
includes a case 12, a motor 14, and a bladeset generally designated 16.
Electricity is
supplied through a power supply 18, such as line voltage, batteries or the
like.
The bladeset 16 includes a moving blade 20 and a stationary blade 22.
The moving blade 20 is pressed against the stationary blade 22 by a tension
spring 24,
which allows the cutting blade 22 to be moved back and forth in a
reciprocating
motion in a transverse direction to a longitudinal axis of the clipper.
Movement of the
moving blade is performed by an eccentric cam 26 which is also coupled to the
motor
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14. A first set of teeth 28 are provided to the moving blade 20, and a second
set of
teeth 30 are provided to the stationary blade 22. An underside 32 of the
moving blade
20 slidingly reciprocates relative to an upper surface 34 of the stationary
blade 22 to
define a cutting area 36 wherein hair caught between the blades is sheared by
the
action of the moving blade relative to the stationary blade, and the shearing
action of
the complementary teeth, as is well known in the art.
The stationary blade 22 on its underside 38 has a location for the head
of at least one threaded fastener 40 which is used to secure a spring
retention bracket
42 to the upper surface 34 and thus fasten the tension spring 24 to the
stationary blade.
In this manner, the moving blade 20 is retained to the stationary blade 22 to
create the
present bladeset 16, which is detachably retained upon the clipper 10 in a
snap-fit
arrangement to permit blade cleaning and replacement.
Referring now to FIGS. 2 and 3, a prior art stationary blade, generally
designated 44, also has an upper side 34 and a lower side 38 as does the blade
22. A
linear row of teeth 46 includes a plurality of relatively short teeth 48, each
such tooth
located between a pair of relatively longer teeth 50 to create what is known
in the art
as a skip tooth blade. Skip tooth blades are typically used for cutting pet
hair, and the
wider space between adjacent longer teeth 50 allows thicker animal hair to be
more
easily drawn into the cutting area 36. The blade 44 is typically fabricated
from a piece
of steel using several stamping and/or machining steps which are well known in
the
art.
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More specifically, the blade 44 includes a base portion 52 having a tooth
end 54 provided with the teeth 46, and a mounting end 56 opposite the tooth
end. At
least one and preferably two mounting apertures 58 are disposed in the base
portion
52 at the mounting end 56 and are each dimensioned to accommodate a fastener
40.
The blade 44 has a pair of outer edges 60, and the plurality of longer
teeth 50 includes a pair of outermost end teeth 62 each of which being located
adjacent a corresponding one of the outer edges 60, and each of the teeth 62
has a
transverse thickness which is thicker than a corresponding thickness of the
remaining
long teeth. Each tooth 48, 50 has a tip 64, 66 and a root 68, 70,
respectively, the roots
being located opposite the tips and being the point at which the tooth engages
the base
portion 52. In the prior art blade 44, it is evident that both the shorter
teeth 48 and the
longer teeth 50 are generally thicker at the roots 68, 70 than at the tips .
64, 66.
Another common feature of such teeth 46 is that the longer teeth 50 have tips
66
which are thinner in cross-section and more lanceolate in shape when viewed
from the
side (best seen in FIG. 3) in order to more easily pass through hair and to
draw hair
into the cutting area 36.
An early attempt at facilitating the evacuation of hair clippings from the
cutting area 36 is clearly seen in FIG. 2. At the roots 68, 70 of the teeth 46
is located
a v-shaped groove 72 which extends from the tooth end 54 to rear ends 74 of
the teeth
46. In manufacturing the blade 44, the grooves 72 are typically created by
machining.
It has been found in practice that this type of groove is unsatisfactory in
the
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evacuation of hair clippings from the cutting area 36. As such, the cutting
area
becomes easily clogged, which requires the operator to take time to clean the
blades
fairly frequently.
Referring now to FIGS. 2A and 2B, cross sections of teeth 46 are
depicted at two points. Each tooth has a rake angle R, which is a measure of
the slope
of the tooth from its base 73 to its crown 75. A drawback of prior art clipper
blades
such as the blade 44 is that the rake angle R varies throughout a portion of
the length
of the tooth near the cutting area 36. This variation, which is the result of
conventional grinding, machining and milling technology, alters the
performance of
the blade and deviates from the blade's design parameters. It will be seen
that the
angle R in FIG. 2A is smaller than the angle R' in FIG. 2B. Also, the portion
of the
tooth in FIG. 2B has a wider base 73 relative to its crown 75 when compared to
the
portion of the tooth in FIG. 2A. The relatively narrower crown 75 in FIG. 2B
will be
more prone to damage or structural deterioration during manufacturing than the
crown
75 in FIG. 2A. Among other things, this disparity in rake angle will result in
a
condition where the portion of the blade represented by FIG. 2A will be less
sharp
than that of FIG. 2B.
Referring now to FIGS. 4-7, the blade of the present invention is shown
in greater detail. It will be seen that the stationary blade 22 is described
as
incorporating the features described below. However, it is contemplated that
these
features may also be incorporated into the moving blade 20. The blade 22 is
designed
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specifically to overcome the drawbacks of the prior art blade 44 relating to
the
problem of the evacuation of hair clippings from the cutting area 36.
Generally
speaking, many of the features to be discussed below are made possible by the
manufacture of the blade 22 by injection molding, rather than the prior
machining
techniques. Although injection molding is commonly associated with plastics,
from
which the present blade 22 may be manufactured, it is contemplated that the
blade 22
is made of injection molded metal.
In that the blade 22 shares many basic elements with the blade 44, the
shared elements will be designated with identical reference numbers. As such,
the
blade 22 includes a base portion 52 having a tooth end 54, a mounting end 56
opposite
the tooth end, and at least one and preferably two mounting apertures 58. A
pair of
outer edges 60 are also found on the blade 22.
In overall tooth configuration, the blade 22 also shares a basic similarity
in with the blade 44, however, one of the features of the present blade 22 is
that the
teeth 30 have been reconfigured to maximize the evacuation of hair and/or hair
clippings from the cutting area 36, and also to minimize pulling or snagging
of the
skin, the latter being a frequent occurrence with prior clippers.
In the present blade 22, the teeth 30, which also each have a base 73 and
a crown 75, include a plurality of short teeth 76, and a plurality of long
teeth 78 being
arranged on the blade in spaced, parallel, skip tooth fashion whereby each of
the short
teeth has one of the long teeth on either side. The teeth 76, 78 project from
the tooth
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end 54 in a direction parallel to the longitudinal axis of the clipper 10.
Each of the
short and long teeth 76, 78 have a corresponding tip 80, 82, as well as a
corresponding
root 84, 86. In similar fashion to the blade 44, the teeth 76, 78 also have a
rear end
74.
A major feature of the present blade 22 is that the roots 84, 86 are joined
to the tooth end 54 in spaced relationship to each other to define a plurality
of
generally planar-floored channels 88 between the roots for facilitating the
evacuation
of hair clippings from the bladeset 16.
Referring now to FIGS. 4 and 6, it will be seen that the root 84, 86 of
each tooth 76, 78 tapers along the tooth length from a broad portion 90
adjacent the
edge of the tooth end 54 toward the relatively narrower tips 80, 82.
Similarly, each
root 84, 86 also tapers from the broad portion 90 toward the mounting end 56.
This
latter tapering also opens up or widens the channels 88 toward the mounting
end 56
to facilitate the evacuation of hair clippings from the cutting area 36. As
best seen in
FIG. 4, in front of the line L, there is no contact between the moving blade
teeth 28
and the stationary blade teeth 30. As a result, the tips 80 and 82 located
beyond the
line L are generally straight-sided to promote feeding of hair into the
cutting area 36.
To the rear of the line L, the teeth 76, 78 are provided with the above-
mentioned
tapered configuration to further facilitate the feeding of the hair into the
cutting area
. 36.
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Referring now to FIGS. 4, 6, 9 and 10, another feature of the present
blade 22 is that each tooth 76, 78 is provided with backstriping in the form
of a
vertically depending (when the clipper 10 is in use) rib 92 which extends from
the rear
ends 74 of each of the teeth in a direction toward ,the mounting end 56. It is
contemplated that the degree of backstriping may vary with the application,
however,
in the preferred embodiment, the backstriping extends substantially the entire
length
of the base portion 52 to a line defined by perimeters 93 of the mounting
apertures 58.
In addition, each of the backstriping ribs 92 is flush with the crown 75 of
the
corresponding tooth 30, and is radiused along its upper edge 94 to reduce
pulling or
snagging of the skin of the individual whose hair is being cut. The
backstriping 92
further defines the channels 88 and further facilitates the evacuation of hair
and/or hair
clippings from the cutting area 36.
Still another feature of the present blade 22 is that the sides of the teeth
76, 78 have a constant rake angle R" (best seen in FIG. 4A), along a portion
of their
length (from the tips 80, 82 to the roots 84, 86) in the cutting area 36. The
rake angle
R" is measured at the base 73 of the teeth in the broad portion 90 near the
cutting area
36. It will be seen in FIG. 4A that the rake angled portion only extends
approximately
1/3 up the height of the tooth 76. This is because if the angle R" were
maintained
throughout the height of the tooth 76, a relatively narrow, sharp crown 75
would be
defined. This type of tooth configuration is undesirable because of the
tendency of
sharp crowns to become easily damaged, or to structurally deteriorate during
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manufacture. In the present blade 22, a tooth configuration is achieved
whereby the
size of the rake angle R" is independent of the thickness of the tooth. In the
tooth 76
as shown in FIG. 4A, the width or thickness of the crown 75 is greater than
would be
the case if the rake angle R" were maintained to the crown. The result is a
tooth
which has a fairly good rake angle compared to normal teeth, but still
maintains
adequate crown width. In one embodiment, the rake angle is 9 °, however
other angles
are contemplated depending on the application.
Thus, in addition to a gradual opening of the channels 88 in a front-to-
back dimension, by customizing the tooth profile, the blade 22 also defines a
widening
or opened space in a vertical direction away from the cutting area 36. Since
the blade
22 is disposed on the clipper 10 so that the teeth 76, 78 face downward, this
configuration encourages the hair and/or hair clippings to fall away from the
cutting
area 36.
Referring now to FIG: 4, at the outer edges 60 of the blade 22, one of
the outermost end teeth 96 is located adjacent a corresponding one of the
outer edges,
and each of the outermost teeth have a transverse thickness which is thicker
than a
corresponding thickness of the other long teeth 78. This thickening is
designed to
provide protection, particularly impact protection, to the teeth located
between the
outermost teeth. In the present blade 22, each of the end teeth 96 defines a
cut out
shoulder region 98 with the corresponding edge 60 which provides the desired
impact
protection, yet minimizes weight.
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Referring now to FIGS. 9 and 10, it will be seen that the base portion 52
of the blade 22 has a wall thickness T, which extends from the mounting end 56
to the
tooth end 54. In the preferred embodiment, the base portion 52 has a zone of
constant
radius beginning at the tooth end 54 to define a transverse hump 100. It is
preferred
that, due to injection molding considerations, the thickness T remains uniform
throughout the base portion, including in the constant radius portion or hump
100.
An advantage of the hump 100 is that it promotes a smooth, flow-
through action of hair being cut, and, by acting in concert with the channels
88, further
facilitates the evacuation of hair clippings from the cutting area 36. In the
preferred
embodiment, the transverse hump 100 is disposed on the blade 22 nearer to the
tooth
end 54 than to the mounting end 56. The planar-floored channels 88 are
substantially
equally spaced from each other when measured at the hump. Naturally, it is
contemplated that the position and shape of the hump 100 may be altered or
even
eliminated depending on the application of the blade 22. However, when a skip
tooth
blade 22 is used to cut animal hair, the presence of the hump 100 will prevent
clogging due to the build-up of animal grease.
Referring now to FIGS. 8-I0, another feature of the blade 22 is that the
tips 80, 82, as well as the crown 75, the upper backstriping 94 and all of the
other
edges of the teeth 76, 78, with the exception of the cutting edges, are
radiused to
minimize any pulling or snagging of the skin or scalp being cut, which
occurred with
prior art bladesets. In addition, a leading edge 102 of each of the long teeth
78 has a
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curved configuration when viewed from the side (best seen in FIG. 9) to
facilitate the
movement of the bladeset 16 through hair.
Referring now to FIG. 11, an alternate embodiment of the blade 22 of
FIG. 4 is shown and is generally designated 104. The main difference between
the
blade 104 and the blade 22 descnbed above is that the blade 104 does not have
a skip
tooth configuration as does the blade 22. Instead, all of the teeth 30 have
the same
length. This type of blade is typically used for cutting human, as opposed to
animal
hair. All of the other components and features of the blade 22 are present in
the blade
104, and have been assigned similar reference numbers.
Referring now to FIG. 12, the moving blade 20 suitable for use with the
present fixed blade 22 is shown in greater detail. A knife-like edge surface
106
separates each of the moving blade teeth 28, and the edges are oriented in the
direction
of movement of the moving blade 20. A feature of the edges 106 is that they
are
capable of cutting some of the hair strands which enter between the stationary
blade
teeth 30. Spacing between adjacent teeth 28 is greater than the space between
adjacent stationary teeth 30. The teeth 28 have flat tips 108, and are
separated by the
knife-like edge surfaces 106. The edges 106 are oriented in the direction A in
which
the moving blade reciprocates, and are sharp enough to cut a hair with a
slicing action
created by the moving blade, although actual razor sharpness is not needed.
Generally, the knife-like edge surfaces 106 cut hair strands as they
would be cut with a knife using a slicing action, and the teeth 28 cut with a
shearing
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action similar to a conventional hair clipper. It is contemplated that in some
cases the
teeth 28 only partially cut some of the hair strands. It is also contemplated
that the
present stationary blade 22 may be used with a conventional moving blade
having a
plurality of teeth without the sharpened edge surfaces 106, as are well known
in the
art.
In use, the hair clipper 10 is used in an ordinary manner. The long teeth
78, with their straight-sided tips and diamond-shaped portions near the
cutting area
36 (when viewed from above, best seen in FIG. 6) help feed the hair into the
cutting
area, where the shearing action of the moving blade 20 relative to the
stationary blade
22 generates hair clippings. A combination of features, including the planar-
floored
channels 88, the backstriping 92 and the transverse hump 100 create a
structure where
clogging or collecting of hair clippings is prevented, and instead, the hair
clippings are
easily evacuated from the cutting area 36.
In addition, when the bladeset 16 is equipped with a moving blade 20
which features the sharpened edge surfaces 106, the clipper 10 may be moved in
a
direction which allows the knife-like surfaces 106 to cut some hair strands,
while the
moving teeth 28 cut other hair strands. The angle of approach to the strands
affects
the rate of cutting by the moving blade. The teeth 28 do not cut the hair
strands in
exactly the same manner as the edges 42, however, which creates a new and
unique
clipper cut hairstyle similar in appearance to the style obtained with a
razor. Other
styles are also contemplated.
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While a particular embodiment of the hair clipper bladeset of the
invention has been shown and described, it will be appreciated by those
skilled in
the art that changes and modifications may be made thereto without departing
from
the invention in its broader aspects and as set forth in the following claims.
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