U.S. patent application number 11/850360 was filed with the patent office on 2008-06-05 for multilayered insole for footwear.
Invention is credited to Ting-Chun CHEN.
Application Number | 20080127527 11/850360 |
Document ID | / |
Family ID | 39323140 |
Filed Date | 2008-06-05 |
United States Patent
Application |
20080127527 |
Kind Code |
A1 |
CHEN; Ting-Chun |
June 5, 2008 |
MULTILAYERED INSOLE FOR FOOTWEAR
Abstract
A multilayered insole for footwear comprises a base layer having
a first thickness, an intermediate layer having a second thickness
and adhered to an upper surface of the base layer, and an upper
layer having a third thickness and adhered to a free surface of the
intermediate layer. The base and upper layers are both made of a
first material formed by foamable polymeric resin compositions. The
intermediate layer is made of a second material formed by foamable
polymeric resin compositions mixed with recycled foamable polymeric
materials. A sum of the first thickness of the base layer and the
second thickness of said intermediate layer is larger than 0.5 mm.
The third thickness of the upper layer can be from 2 mm to 5
mm.
Inventors: |
CHEN; Ting-Chun; (Miaoli
County, TW) |
Correspondence
Address: |
BROWDY AND NEIMARK, P.L.L.C.;624 NINTH STREET, NW
SUITE 300
WASHINGTON
DC
20001-5303
US
|
Family ID: |
39323140 |
Appl. No.: |
11/850360 |
Filed: |
September 5, 2007 |
Current U.S.
Class: |
36/3B ; 36/3R;
36/44 |
Current CPC
Class: |
A43B 17/006 20130101;
A43B 13/386 20130101; A43B 17/003 20130101; A43B 17/10 20130101;
A43B 13/12 20130101; A43B 17/14 20130101 |
Class at
Publication: |
36/3.B ; 36/3.R;
36/44 |
International
Class: |
A43B 7/06 20060101
A43B007/06; A43B 13/38 20060101 A43B013/38 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 5, 2006 |
TW |
95221418 |
Claims
1. A multilayered insole for footwear, comprising a base layer
having a first thickness; an intermediate layer having a second
thickness and adhered to an upper surface of said basic layer; and
an upper layer having a third thickness and adhered to a free
surface of an intermediate layer; said base and upper layers being
made of a first foamable material formed by foamable polymeric
resin compositions; said intermediate layer being made of a second
foamable material formed by foamable polymeric resin compositions
mixed with recycled foamable polymeric materials; a sum of said
first thickness of said base layer and said second thickness of
said intermediate layer being larger than 0.5 mm; and said third
thickness of said upper layer being 2 mm to 5 mm.
2. The insole of claim 1, wherein the sum of said first thickness
of said base layer and said second thickness of said intermediate
layer is larger than 0.5 mm but smaller than 4 mm.
3. The insole of claim 1, wherein said first thickness of said base
layer is smaller than said second thickness of said intermediate
layer.
4. The insole of claim 1, wherein said third thickness of said
upper layer is larger than the sum of said first thickness of said
base layer and said second thickness of said intermediate
layer.
5. The insole of claim 1, wherein said third thickness of said
upper layer is 4 mm.
6. The insole of claim 1, further comprising a top layer made of
fabrics and adhered to a free surface of said upper layer.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates generally to insoles for
footwear, and more particularly to a multilayered insole having
good resistance to compression and excellent air permeability.
[0003] 2. Description of the Related Art
[0004] U.S. Pat. No. 4,642,912 issued to Gray discloses an improved
insole. The insole is characterized in that it consists of three
layers. Each of the layers is constructed of flexible foam with a
specific compressive strength. As a result, the retention rate of
cushioning properties after wear of the insole is higher than that
of prior art. But the drawback of the three-layer insole is that
the air permeability thereof turns bad as comparing with prior art.
In other words, the patented insoles may have good retention of
cushioning properties after wear but the air permeability thereof
is bad.
[0005] Thus, there exists a need for an insole having good
retention of cushioning properties after wear as well as excellent
air permeability.
[0006] Accordingly, the present invention provides a multilayered
insole for footwear that has high retention rate of cushioning
properties after wear as well as good air permeability.
SUMMARY OF THE INVENTION
[0007] In accordance with one aspect of the present invention, a
multilayered insole for footwear comprises a base layer having a
first thickness, an intermediate layer having a second thickness
and adhered to an upper surface of the base layer, and an upper
layer having a third thickness and adhered to a free surface of the
intermediate layer. The base and upper layers are both made of a
first material formed by foamable polymeric resin compositions. The
intermediate layer is made of a second material formed by foamable
polymeric resin compositions mixed with recycled foamable polymeric
materials. A sum of the first thickness of the base layer and the
second thickness of said intermediate layer is larger than 0.5 mm.
The third thickness of the upper layer can be from 2 mm to 5
mm.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Further characteristics and advantages of the insole
according to the present invention will become more apparent
hereinafter from the following detailed disclosure of a preferred,
though not exclusive, embodiment of the invention, which is
illustrated, by way of an indicative, but not limitative, example,
in the accompanying drawings, where:
[0009] FIG. 1 is a perspective view of an insole according to an
embodiment of the present invention;
[0010] FIG. 2 is a sectional view of the insole of FIG. 1 taken
along section 2-2.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
[0011] Referring to FIGS. 1 and 2, the insole 10 of the present
invention generally comprises a base layer 12, an intermediate
layer 14, an upper layer 16 and a top layer 20.
[0012] The base layer 12, which is made of a first foamable
material formed by a foamable polyurethane resin, is preferably of
generally flat construction with a thickness of 0.5 mm. The base
layer 12, for having a thickness specially designed and being made
of a foamable material not mixed with any other materials, has a
better resistance to compression than any other foamable materials
so as to provide a high retention rate of cushioning properties
after wear.
[0013] The intermediate layer 14 is adhered to an upper surface of
the base layer 12 and preferably is of generally flat construction.
The intermediate layer 14 is made of a second foamable material
formed by a foam polyurethane resin mixing with recycled polymeric
foam materials. Such a foamable material, for being mixed with
recycled polymeric foam materials, has a better air permeability
than the first foamable material. For getting excellent air
permeability and good resistance compression, the sum of the
thickness of the base layer 12 and the thickness of the
intermediate layer 14 is larger than 0.5 mm but smaller than 4 mm.
In this embodiment, the thickness of the intermediate layer 14 is
approximately 3 mm.
[0014] The upper layer 16 is also made of the first foamable
material and adhered to an upper surface of the intermediate layer
14. The thickness of the upper layer 16 is preferably larger than
the sum of the first thickness of the base layer 12 and the second
thickness of the intermediate layer 14. In this embodiment, the
thickness of the upper layer 16 is approximately 4 mm.
[0015] The top layer 20 is made of any suitable fabrics such as
cloth. It is adhered to an upper surface of the upper layer 16 to
increase the comfort and prevent sliding during wear.
[0016] As described above, we can clearly understand that the
layers of the insole 10 are made of different foamable materials
and each of them has a specific thickness. As a result, the
retention rate of cushioning properties after wear and the air
permeability of the insole 10 are both better than the prior art
insoles. According to experiments made by the inventor, the
retention rate of cushioning properties of the insole 10, when
being worn six months, is 90%, but that of prior art insoles is
less than 50%. The air permeability of the insole 10 is 500-700
l/m.sup.2 see and that the prior art insoles is only 200-300
l/m.sup.2 sec.
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