U.S. patent application number 13/261059 was filed with the patent office on 2013-04-04 for insole for a shoe.
This patent application is currently assigned to TREKSTA INC. The applicant listed for this patent is Jin Hoon Kim, Sung Won Park. Invention is credited to Jin Hoon Kim, Sung Won Park.
Application Number | 20130081306 13/261059 |
Document ID | / |
Family ID | 41684637 |
Filed Date | 2013-04-04 |
United States Patent
Application |
20130081306 |
Kind Code |
A1 |
Park; Sung Won ; et
al. |
April 4, 2013 |
INSOLE FOR A SHOE
Abstract
The present invention relates to an insole installed inside a
shoe to contact each foot sole portion of the human forefoot (A),
midfoot (C) and rearfoot (B), which is made of a plurality of
materials having varying degrees of hardness depending on the
insole region, wherein the respective materials are combined to
form a single layer. Preferably, the insole for a shoe comprises: a
base plate with any one of a forefoot hole, a midfoot hole and a
rearfoot hole formed therein corresponding to one of respective
foot regions (A), (B) and (C); and an inner plate including one or
more of a forefoot support, midfoot support and rearfoot support to
be inserted into one of the holes, and, respectively, wherein the
base plate and the inner plate are manufactured with materials
having varying degrees of hardness relative to one another.
Inventors: |
Park; Sung Won; (Buk-gu,
KR) ; Kim; Jin Hoon; (Saha-gu, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Park; Sung Won
Kim; Jin Hoon |
Buk-gu
Saha-gu |
|
KR
KR |
|
|
Assignee: |
TREKSTA INC
BUSAN
KR
|
Family ID: |
41684637 |
Appl. No.: |
13/261059 |
Filed: |
June 23, 2009 |
PCT Filed: |
June 23, 2009 |
PCT NO: |
PCT/KR2009/003347 |
371 Date: |
August 8, 2012 |
Current U.S.
Class: |
36/43 |
Current CPC
Class: |
A43B 13/383 20130101;
A43B 17/14 20130101; A43B 7/145 20130101; A43B 17/02 20130101; A43B
7/144 20130101; A43B 7/1435 20130101; A43B 7/1425 20130101; A43B
13/38 20130101; A43B 7/1445 20130101; A43B 17/08 20130101 |
Class at
Publication: |
36/43 |
International
Class: |
A43B 13/38 20060101
A43B013/38 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 4, 2009 |
KR |
10-2009-0049383 |
Claims
1-18. (canceled)
19. An insole for shoe, installed in a shoe to contact each sole
portion of the human forefoot (A), midfoot (C) and rearfoot (B),
which is made of a plurality of materials having varying degrees of
hardness depending on the insole region, wherein the respective
materials are combined to form a single layer.
20. The insole for a shoe according to claim 19, wherein the insole
comprises: a base plate including a midfoot concave support for
supporting a concave of the midfoot (C), and the midfoot concave
support integrally extended to an edge of the insole corresponding
to an edge of the rearfoot (B), which is supported by the base
plate; and an inner plate including a forefoot support for
supporting the whole part of the forefoot (A), a midfoot support
integrally extended from the forefoot support except for region
occupied by the midfoot concave support, and the rearfoot support
integrally extended from the midfoot support to the inner portion
of the edge of the rearfoot (B) to support the middle portion of
the rearfoot (B); and wherein materials of which the base plate and
the inner plate are made of different hardness relative one
another.
21. The insole for a shoe according to claim 19, wherein the insole
comprises: a base plate including one among a forefoot hole, a
midfoot hole and a rearfoot hole, which holes correspond to one of
the portions (A), (B) and (C) in their regions, respectively; and
an inner plate including one among a forefoot support, a midfoot
support and a rearfoot support, which are inserted into one of the
holes, respectively; and wherein materials of which the base plate
and the inner plate are made of different hardness relative one
another.
22. The insole for a shoe according to claim 20, wherein the
hardness of the base plate is higher than that of the inner
plate.
23. The insole for a shoe according to claim 20, wherein the inner
plate has a heel hole formed in the rearfoot support, and the first
plate which are different from the inner plate in hardness of
materials thereof is inserted into the heel hole.
24. The insole for shoe according to claim 23, wherein the hardness
of the inner plate is higher than that of the first plate.
25. The insole for a shoe according to claim 24, wherein the first
plate is protruded upwardly higher than a height of the inner
plate.
26. The insole for a shoe according to claim 20, wherein the inner
plate has a forward hole formed in the midfoot support, and the
second plate which are different from the inner plate in hardness
of materials thereof is inserted into the forward hole.
27. The insole for a shoe according to claim 26, wherein the
hardness of the inner plate is higher than that of the second
plate.
28. The insole for a shoe according to claim 27, wherein the second
plate is protruded upwardly higher than a height of the inner
plate.
29. The insole for a shoe according to claim 25, wherein the first
plate and the second plate is protruded to form the shape of the
arch based on sectional view such that the heights of the
protrusion of the plates and are the same as those of the inner
plate in the boundary regions between the plates and the inner
plate, and are gradually increased in the inner direction of the
boundary.
30. The insole for a shoe according to claim 19, wherein the insole
comprises an Convex-concave portion corresponding complementarily
to toes of human foot in shape.
31. The insole for a shoe according to claim 19, wherein the insole
comprises a midfoot concave support which is protruded upwardly to
correspond, complementarily in shape, to a concave formed on the
sole of the midfoot (C).
32. The insole for shoe according to claim 31, wherein a plurality
of the air holes is formed in the midfoot concave support.
33. The insole for a shoe according to claim 19, wherein the insole
comprises a forefoot concave support which is protruded upwardly to
correspond, complementarily in shape, to a concave formed on the
sole of the forefoot (A).
34. The insole for a shoe according to claim 33, wherein a
plurality of the air holes is formed in the forefoot concave
support.
35. The insole for a shoe according to claim 19, wherein the insole
further comprises a plurality of the air holes penetrated through
vertically.
36. The insole for a shoe according to claim 20, wherein the insole
further comprises a cover with which the entire of upper or
exterior surface of the insole is enclosed.
Description
TECHNICAL FIELD
[0001] The present invention relates to an insole installed in the
bottom inside a shoe to contact the human sole for supporting a
sole of the human foot and absorbing the pressure shock, and more
particularly, to an insole being made of a plurality of materials
having varying degree of hardness depending on the insole region,
wherein the respective materials are combined to form a single
layer, considering the different pressure distribution depending
upon a foot sole portion by a human load.
BACKGROUND ART
[0002] Conventionally, an insole is installed in the bottom inside
a shoe to contact the human sole for supporting, protecting human
foot and absorbing the pressure shock, and most of them generally
has a shape similar to the sole of a human foot and some specific
portion of the insole is protruded in order to support the concave
portion of a foot. And the insole is entirely made of single
material, foam resin of elasticity and restoration, such as
urethane foam and so forth.
[0003] When a sole is contacted to the earth on walking, a uniform
pressure distribution is not transmitted to the sole of a human
foot through the entire section of the sole. For example, the
forward portion of a midfoot (see definitions in Description of
Embodiments) and the heel of a rearfoot (see definitions in
Description of Embodiments) receive relatively much higher pressure
applied thereon, whereas the concave of a midfoot (see definitions
in Description of Embodiments) scarcely receives the pressure
applied thereon.
[0004] Therefore, an insole made of a single material cannot
effectively reflect on or cope with the different pressures applied
to the different portions of the sole respectively, and especially
cannot absorb much higher pressure-shock concentrated on specific
protruded portion of the foot, so that long time walking with a
shoe having a single-material insole causes to the foot aches and
feels easily fatigue.
[0005] In order to solve the said problems, Korean Utility Model
Registration No. 20-0388223 disclosed a foaming insole consisting
of respectively different hardness of a fore portion and a rear
portion of the insole.
[0006] The disclosed foaming insole of prior art, however, cannot
absorb sufficiently all the pressure shocks on different pressure
portions of the foot sole, because the said insole is manufactured
by using the materials having simply different hardness of the fore
portion and rear portion of the insole without considering the
pressure distribution of a foot sole on the biomechanical data.
That is to say, although the received pressures to be contacted the
forefoot and the toes in the fore portion of an insole are
different one another, the said insole is made of a single
material, thereby it being not possible to distribute the pressure
shocks uniformly.
[0007] And among the insoles being sold in the market, it is
disclosed that some insole is additionally attached by the insole
piece having low hardness on the specific portion of the basic
insole. However, since such an insole has a structure of the
double-laminated layers having respectively different hardness, the
attached material of the said insole art gives a person with the
shoe to feel a different sensation due to the different thickness
between the attached piece and the non-attached base insole.
Furthermore, the insole having the attached insole piece has
disadvantages in that air permeability thereof is not good because
the attached piece on the basic insole is attached by adhesive
agent, and also the attached piece may be easily removed from the
basic insole.
DETAILED DESCRIPTION OF THE INVENTION
Technical Problem
[0008] In order to solve the problems of prior arts as mentioned,
the present inventors have conducted extensive studies the changes
of the pressure and shape of the foot when wearing on shoe in
aspect of biomechanics, and as a result have found that the said
drawback can be removed by providing an insole preparing by a
plurality of materials having varying degrees of hardness depending
on the insole region. Accordingly, the purpose of the present
invention provides an insole wherein the insole is made of a
plurality of materials having varying degrees of depending on the
insole region, and the respective materials are combined to form a
single layer, and the upper surface of the insole has a shape
corresponding complementarily in shape to a sole of human foot such
that the insole has complementary shapes corresponding to the
rearfoot, the midfoot and the forefoot thereby providing almost
bare-foot sensation on insole installed inside shoe of the present
invention.
Solution to Problem
[0009] In order to attain the above object, one aspect according to
the preferable embodiments of the present invention provides an
insole installed inside a shoe to contact each foot sole portion of
the human forefoot (A), a midfoot (C) and a rearfoot (B),
respectively; and the insole is made of plurality of materials
having varying degrees of hardness depending on the insole region,
and the respective materials are combined to form a single
layer.
[0010] Preferably, the insole comprises: a base plate (10)
including one among a forefoot hole (11), a midfoot hole (13) and a
rearfoot hole (12), which holes correspond to one of the portions
(A), (B) and (C) in their regions, respectively; and an inner plate
(20) including one among a forefoot support (21), a midfoot support
(23) and a rearfoot support (22), which are inserted into one of
the holes (11), (12) and (13), respectively; and wherein the base
plate (10) and the inner plate (20) are manufactured with materials
having varying degrees of hardness relative to one another.
[0011] More preferably, the inner plate (20) has a heel hole (22a)
formed in the rearfoot support (22), and the first plate (22b)
which has different hardness of materials from the inner plate (20)
is inserted into the heel hole (22a).
[0012] Still more preferably, the inner plate (20) has a forward
hole (23a) formed in the midfoot support (23), and the second plate
(23b) which has different hardness of materials from the inner
plate (20) thereof is inserted into the forward hole (23a).
Advantageous Effects of Invention
[0013] According to the present invention, the insole has a shape
corresponding complementarily in shape to a sole of human foot, and
is made of a plurality of materials having varying degrees of
hardness depending on the insole region, and as a result, the
insole of the present invention effectively can absorb the big
pressure shocks concentrated on the protruded portions of the foot
sole, whereas the portion of not-much pressure on the insole is not
nearly deformed to improve fitting power thereof and provides
almost bare-foot sensation with the insole installed inside a
shoe.
[0014] Differing from the prior art, which attaching the insole
piece of the different material having different hardness onto the
basic insole to form two or more laminated-layers, the present
invention, the pressure-shock absorbing materials such as the first
and the second plate are fitted, complementarily in shape, into the
holes formed on the basic insole to be assembled into only one
layer without any over-and-over laminated layers to resultantly
avoid the different sensation between the materials of different
materials. The present invention has further advantages in that it
is possible to avoid the using of any adhesive agent, and also gaps
between the materials of different materials provide the improved
air permeability to promote dryness of sweat and easily to exhaust
or suppress bad smell and provide comfortable wearability of a shoe
having the insole of the present invention therein.
BRIEF DESCRIPTION OF DRAWINGS
[0015] FIG. 1 is an explanation view illustrating a contact
pressure distribution of a foot sole upon grounding;
[0016] FIG. 2 is an exploded perspective view illustrating an
insole for a shoe according to one embodiment of the present
invention;
[0017] FIG. 3 is an assembled perspective view illustrating the
insole for a shoe according to one embodiment of the present
invention;
[0018] FIG. 4 is a plan view illustrating the insole for a shoe
according to one embodiment of the present invention;
[0019] FIG. 5 is a partly enlarged sectional view illustrating the
insole for a shoe according to one embodiment of the present
invention;
[0020] FIG. 6 is an assembled perspective view illustrating an
insole for a shoe according to another embodiment of the present
invention, and
[0021] FIG. 7 is a plan view illustrating an insole for a shoe
according to still another embodiment of the present invention.
REFERENCE SIGNS LIST
[0022] 10: Base plate, 11: Forefoot hole [0023] 12: Rearfoot hole,
13: Midfoot potion hole [0024] 15: Convex-concave portion, 16:
Midfoot concave support [0025] 17: Forefoot concave support, [0026]
20: Inner plate, 21: Forefoot support [0027] 22: Rearfoot support,
22a: Heel hole [0028] 22b: First plate [0029] 23: Midfoot support,
23a: forward hole [0030] 23b: Second plate [0031] 30: Cover [0032]
A: Forefoot, B: Rearfoot, C: Midfoot
BEST MODE FOR CARRYING OUT THE INVENTION
[0033] The present invention relates to an insole installed inside
a shoe to contact each foot sole portion of the human forefoot (A),
midfoot (C) and rearfoot (B), which is made of a plurality of
materials having varying degrees of hardness depending on the
insole region, wherein the respective materials are combined to
form a single layer. Preferably, the insole for a shoe comprises: a
base plate (10) with any one of a forefoot hole (11), a midfoot
hole (13) and a rearfoot hole (12) formed therein corresponding to
one of respective foot regions (A), (B) and (C); and an inner plate
(20) including one or more of a forefoot support (21), a midfoot
support (23) and a rearfoot support (22) to be inserted into one of
the holes (11), (12) and (13), respectively, wherein the base plate
(10) and the inner plate (20) are manufactured with materials
having varying degrees of hardness relative to one another.
Description of Embodiments
[0034] Hereinafter, the present invention according to embodiments
will be described in more detail with reference to the insole
illustrated in the accompanying drawings.
[0035] FIG. 1 is an explanation view illustrating a contact
pressure distribution of a foot sole upon grounding by walking. For
convenience of understanding more easily the gist of the present
invention, above all, it is preferable to define some terminologies
such as terms for each portion of a sole of a human body and terms
for each portion of an insole corresponding to each portion of the
sole.
[0036] As illustrated on FIG. 1, a sole of a human foot can be
generally divided into three portions. The first one among the
three portions is a front portion of the foot (hereinafter referred
to as "forefoot" or "forefoot A") which includes toes and a
concave, the second one is a rear portion of the foot (hereinafter
referred to as "rearfoot" or "rearfoot B") which includes a heel,
and the third one is a middle portion of the foot (hereinafter
referred to as "midfoot" or "midfoot C") which is located between
the forefoot (A) and the rearfoot (B). The three portions of the
sole have different pressure distributions depending on the
portions of a foot upon grounding, respectively, when walking or
running.
[0037] Of course, the pressure distributions thereof are not
identical to each other according to an individual walking habits
or postures, respectively. However, in light of the general
pressure distribution for the common person, the pressure
distribution of the sole can be generally divided into three
portions. The first portion 1 among the three portions has
relatively higher pressure, and is distributed on both some part of
the heel of the rearfoot (B) and forward part of the midfoot (C).
The second portion 2 thereof has relatively lower pressure than
that of the first portion 1, and is distributed on some parts of
grounding toes and some parts along around the first portion 1.
Finally, the third portion 3 thereof has relatively the lowest
pressure among the three portions, and is distributed on the rest
of the sole except for the portions 1 and 2, including some concave
parts of an arch type in the sole.
[0038] Based on the pressure distribution for the foot sole in
light of a view of the biomechanics, as mentioned above, the
present invention is intended to provide an insole installed inside
a shoe and contacted each sole part of a human foot corresponding
to the forefoot (A), the rearfoot (B) and the midfoot (C), is
characterized in that each insole thereof comprises plurality of
materials having varying degrees of hardness depending on the
portions of the pressure distribution, and the materials of the
insole are combined to form a single layer. The structure of the
insole will be described in more detail as exemplary embodiments,
with reference to FIGS. 2 to 4.
[0039] FIG. 2 is an exploded perspective view illustrating an
insole for a shoe according to one embodiment of the present
invention, FIG. 3 is an assembled perspective view illustrating the
insole for a shoe according to one embodiment of the present
invention, and FIG. 4 is a plan view illustrating the insole for a
shoe according to one embodiment of the present invention.
[0040] With reference to FIGS. 2 to 4, an insole according one
embodiment of the present invention includes a plurality of
materials, of which materials are different from each other in
their hardness. All the plates used in the specification means the
materials of the present invention. The insole includes a base
plate (10) of which edge is similar to that of the sole of a human
foot in shape. The base plate (10) has holes, therein, such as a
forefoot hole (11), a midfoot hole (13) and a rearfoot hole (12),
which correspond to the forefoot (A), the midfoot (C), and the
rearfoot (B) in their region, respectively.
[0041] Of course, according to a modified embodiment of the present
invention, the insole may not include one or two among the forefoot
hole (11), the midfoot hole (13) and the rearfoot hole (12). In
other words, the insole may include selectively only one or two
selected from the forefoot hole (11), the midfoot hole (13) and the
rearfoot hole (12). Such a modified embodiment is also within the
scope of the present invention.
[0042] Such a base plate (10) may be made of for example the
material of the third portion (3) which has the highest hardness or
the lowest elasticity among the three portions materials because of
the lowest pressure distribution thereof. As long as the hardness
of the materials for the base plate (10) is 65.about.80, preferably
68.about.76, based on ASKER C TYPE, the kinds of the materials used
is not particularly limited. The materials used for the base plate
(10) include for example, ethylene-vinyl acetate (EVA) foam,
polyurethane (PU) foam and so forth.
[0043] On the other hand, in case that the base plate (10) includes
one or more of the holes (11), (12) and (13), the insole has an
inner plate (20) with which the holes (11), (12) and (13) are
matched complementarily in shape. More specifically, the inner
plate (20) fills fittingly one of the possible holes (11), (12) and
(13) with itself to be a single layer when assembled with each
other. The filled hole may be any one of the three holes (11), (12)
and (13) according to the embodiments of the present invention.
[0044] As illustrated in FIG. 1, because the inner plate (20) has
relatively higher pressure than that of the base plate (10) in
their pressure distribution portions, the inner plate (20) is made
of a material different from that of the base plate (10).
Preferably, the material of the inner plate (20) has the lower
hardness than that of the base plate (10). As long as the hardness
of the materials for the inner plate (20) is 25.about.40,
preferably 28.about.36, based on ASKER C TYPE, the kinds of
materials used is not particularly limited. The materials used for
the base plate (10) include for example, ethylene vinyl acetate
(EVA) foam, polyurethane (PU) foam and so forth.
[0045] In case that the relatively higher hardness base plate (10)
are combined with the relatively lower hardness inner plate (20) as
described above, the relatively soft inner plate (20) receives the
relatively higher pressures than the base plate (10) so as to
effectively obtain a shock-absorbing effect. Also, because an
insole having the base plate (10) and the inner plate combined
complementarily with other becomes a single layer without any
laminating on basic insole, the insole of the present invention can
avoid to make an insole having a laminated layer on the basic
insole layer of prior art, and can improve the fitting sensation
thereof without the difference feeling.
[0046] Additionally, the inner plate (20) of the present invention
may also have further-much lower hardness material separately
therein regardless of said lower hardness material. More
specifically, the inner plate (20) may has a heel hole (22a) formed
on a rearfoot support (22) corresponding to the heel of the human
foot in their regions. The heel hole (22a) receives fittingly the
first plate (22b) of which hardness is different from that of the
inner plate (20), preferably lower than that of the inner plate
(20).
[0047] In case of the structure mentioned above, because the heel
portion has relatively highest pressure distribution (the first
portion) as illustrated in FIG. 1, the relatively softer first
plate receives the relatively higher pressures among any other
portions so as to easily and very effectively obtain a
shock-absorbing effect. Also, because the insole entirely becomes a
single layer without any laminating, the insole of the present
invention can improve the fitting feeling thereof without sensation
of difference due to thickness of each material.
[0048] According to such a technical ideal of the present
invention, additionally, the inner plate (20) may have a forward
hole (23a) formed on a midfoot support (23) corresponding to the
forward middle portion of the human foot in their regions. The
forward hole (23a) receives fittingly the second plate (23b) of
which hardness is different from that of the inner plate (20),
preferably lower than that of the inner plate (20).
[0049] Accordingly, because the forward portion of the midfoot like
a heel portion has relatively highest pressure distribution (the
first portion) as illustrated in FIG. 1, the relatively softer
second plate receives the relatively higher pressures among any
other portions so at to easily and very effectively obtain a
shock-absorbing effect. Also, because the insole entirely becomes
only one layer without any laminating by attaching the piece over
the basic insole, the insole of the present invention can improve
the fitting sensation thereof without feeling of difference due to
thickness of each material.
[0050] Because the materials used for the first plate (22b) and the
second plate (23b) have relatively softer than that of the inner
plate (20), the degree of the hardness of the materials for the
plates (22b) and (23b) are hardly measured based on ASKER C TYPE.
Therefore, converted to Shore Hardness, when the hardness of the
materials for the plates (22b) and (23b) are 60.about.72,
preferably 62.about.70, the kinds of the materials used is not
particularly limited. The materials used for the plates (22b) and
(23b) include for example, ethylene vinyl acetate (EVA) foam,
polyurethane (PU) foam and so forth.
[0051] As described above, assembled with the different materials
in hardness thereof depending on the insole region thereof, the
insole may have an Convex-concave portion (15) corresponding
complementarily to the toes of a human foot in shape, respectively,
on forward edge part thereof corresponding to the forefoot, so that
the forward part of the insole can be formed to complementarily
match with toes of foot in shape to improve wearability and fitting
feeling (See FIG. 4).
[0052] Also, the base plate (10) may has a midfoot concave support
(16) protruded upwardly to be formed in the form of arch in one
side of the third portion 3 in the base plate (10). The midfoot
concave support (16) has relatively higher hardness and
corresponds, complementarily in shape, to the sole of the midfoot
(C) to support the sole of the midfoot, and resultantly improve the
fitting sensation on shoe having the insole of the present
invention.
[0053] Similarly, in case of a forefoot concave support (17)
protruded upwardly to be formed between the forefoot hole (11) and
the midfoot portion hole (13), in other words, be corresponded,
complementarily in shape, to the concave of the forefoot (A) or the
concave between the toes and the midfoot (C), the forefoot (A) has
relatively higher hardness to support the concave of the forefoot
(A), and resultantly also improve the fitting sensation.
[0054] Further, in case that both the base plate (10) and the inner
plate (20) have the first plate (22b) and the second plate (23b)
inserted therein respectively, if each of the first plate (22b) and
the second plate (23b) has air holes of small diameter penetrated
through vertically, not only sweat accumulation in the insole can
be prevented and but also cause of bad smell can be diminished
because air can be well vented vertically through the air
holes.
[0055] FIG. 5 is a partly enlarged sectional view illustrating the
insole for a shoe according to one embodiment of the present
invention.
[0056] As shown in FIG. 5, because the insole is composed of the
base plate (10) and the inner plate (20) or composed of the base
plate (10), the inner plate (20), and the first and the second
plates (22b) and (23b), which are different from each other in
hardness thereof and combined with each other in the form of
assembling manner to form a single layer without any laminating on
basic insole, the assembled plates is not required to be separated
from each other.
[0057] Accordingly, it is preferable to fixedly wrap the entire
surface of the insole with a cover (30) which is preferably
well-ventilative fabric material. The cover (30) may be adhered to
the exterior surface of the insole by fusion in order to avoid
using adhesive agent. Alternatively, the cover (30) may be adhered
by fusion to only upper surface of the insole because only the
upper surface to which the cover (30) is adhered can support the
shape of the insole.
[0058] With reference to FIG. 6, the first plate (22b) and the
second plate (23b) has the lowest hardness of material so that they
may be relatively further compressed, compared to the inner plate
(20) located adjacent the plates (22b) and (23b), to resultantly,
provide sensation of difference.
[0059] Accordingly, the first plate (22b) and the second plate
(23b) may have an uplifted (or upwardly protruded) different
heights higher than that of the inner plate (20) to minimize the
sensation of difference. The different heights of the plates (22b)
and (23b) may be 0.5.about.1.0 mm.
[0060] More preferably, the first plate (22b) and the second plate
(23b) is protruded upwardly to form the shape of an arch based on
sectional view such that the heights of the protrusion of the
plates (22b) and (23b) are the same as those of the inner plate
(20) in the boundary portions between the plates (22b) and (23b)
and the inner plate (20), and are gradually increased in the inner
direction of the boundary.
[0061] As shown in FIG. 6, air holes (16a)(17a) are formed in the
midfoot concave support (16) and the forefoot concave support (17)
of the base plate (10), respectively. Accordingly, when the lifted
portions of the base plate (10), that is, the midfoot concave
support 16 and the forefoot concave support (17) are compressed,
the interior parts of the air holes (16a)(17a) are repeatedly
compressed and returned to play a role as pumping means and improve
air permeability as a result.
[0062] Of course, the air holes are not particularly limited to be
located on the specific region of the base plate (10). For example,
in case of the inner plate (20) with the first and the second
plates (22b) and (23b) assembled, each plate may has the air holes,
if necessary. In other words, the entire sections of the insole may
have the air holes, if necessary.
[0063] FIG. 7 is a plan view illustrating an insole for shoe
according to still another embodiment of the present invention,
wherein the same reference numerals will be applied to the same
components.
[0064] According to one modified embodiment of the present
invention, the base plate (10) includes the midfoot concave support
(16) for supporting the midfoot (C), and is extended from the
midfoot concave portion (16) to an edge of the rearfoot (B) to
support the edge of the portion B. The midfoot concave support (16)
and the extended portion of the plate (10) around the edge of the
portion B are integrally formed with each other.
[0065] The inner plate (20) includes the forefoot support (21) for
supporting the whole part of the forefoot (A), the midfoot support
(23) integrally extended from the forefoot support (21) except for
the portions occupied by the midfoot concave support (16), and the
rearfoot support (22) integrally extended from the midfoot support
(23) to the inner portion of the edge of the rearfoot B to finally
support the middle portion of the rearfoot (B). The materials of
the base plate (10) and the inner plate (20) are different from
each other in the hardness thereof, preferably the hardness of the
base plate (10) is higher than that of the inner plate (20). The
degrees of the hardness and the kinds of materials used for the
plates are selected from the hardness and the kinds of materials
mentioned above in the previous embodiments.
[0066] Furthermore, the rearfoot support (22) of the inner plate
(20) has a heel hole (22a) formed in the region being contacted
with the heel of the foot. The first plate (22b) is fittingly
inserted into the heel hole (22a). The material of the first plate
(22b) is different from that of the inner plate (20) in hardness,
and preferably has lower hardness than that of the inner plate
(20).
[0067] Still furthermore, the midfoot support (23) of the inner
plate (20) may have the forward hole (23a) into which the second
plate (23b) is inserted. The hardness of the material of the second
plate (23b) is different from that of the inner plate (20), and
preferably has lower hardness than that of the inner plate (20).
The degrees of the hardness and the kinds of materials used for the
plates are selected from the hardness and the kinds of materials
mentioned above in the previous embodiments.
[0068] As described above, the present invention is characterized
in that the insole has a plurality of materials having varying
degrees of hardness depending on the insole region, and the
respective materials of the insole are combined to form a single
layer. It will be apparent to those of ordinary skill in the art
that various modifications can be made to the exemplary embodiments
of the invention described above. However, as long as modifications
fall within the scope of the appended claims and their equivalents,
they should not be misconstrued as a departure from the scope of
the invention itself.
INDUSTRIAL APPLICABILITY
[0069] The insole of the present invention is made to be similar to
the human foot sole in shape thereof, and has a plurality of
materials having varying degrees of hardness in accordance with the
pressure distributions of the materials generated upon grounding.
Therefore, the insole of the present invention can effectively
absorb pressure-shocks generated from the pressure-concentrated
portions by deforming the corresponding portions thereof, and the
pressure-not-concentrated portions are scarcely deformed to improve
the fitting ability and provide wearability of shoe almost similar
to bare-foot feeling.
* * * * *