U.S. patent application number 11/186535 was filed with the patent office on 2006-02-02 for flexible puncture resistant sole.
This patent application is currently assigned to Tsung Jen HUANG and Sheng I. LIN. Invention is credited to Sheng Chung Hung.
Application Number | 20060021257 11/186535 |
Document ID | / |
Family ID | 34893747 |
Filed Date | 2006-02-02 |
United States Patent
Application |
20060021257 |
Kind Code |
A1 |
Hung; Sheng Chung |
February 2, 2006 |
Flexible puncture resistant sole
Abstract
A puncture or cut resistant protective sole for footwear made of
woven fiber plies and flexible bonding agent disposed between
adjacent woven fiber plies to define an alternating layered
composite, wherein the flexible bonding agent penetrates into voids
of each woven fiber ply and bonds fibers of each woven fiber ply to
fibers within the same ply.
Inventors: |
Hung; Sheng Chung; (Tai
Chung City, TW) |
Correspondence
Address: |
Mark Kusner;KUSNER & JAFFE
Highland Place - Suite 310
6151 Wilson Mills Road
Highland Heights
OH
44143
US
|
Assignee: |
Tsung Jen HUANG and Sheng I.
LIN
Linear International Footwear Inc.
|
Family ID: |
34893747 |
Appl. No.: |
11/186535 |
Filed: |
July 21, 2005 |
Current U.S.
Class: |
36/73 |
Current CPC
Class: |
A43B 13/12 20130101;
A43B 13/026 20130101 |
Class at
Publication: |
036/073 |
International
Class: |
A43B 13/22 20060101
A43B013/22 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 27, 2004 |
CN |
200420071938.4 |
Claims
1. A puncture or cut resistant protective sole for footwear
comprising: a plurality of woven fiber plies; and a plurality plies
of flexible bonding agent disposed between adjacent woven fiber
plies to define an alternating layered composite, wherein the
flexible bonding agent penetrates into voids of each woven fiber
ply and bonds fibers of each woven fiber ply to fibers within the
same ply.
2. A sole according to claim 1 wherein the bonding agent is
selected from the group consisting of: rubber; plastic; and
resin.
3. A sole according to claim 1 wherein the bonding agent is
thermo-formable.
4. A sole according to claim 1 wherein the woven fiber plies
comprise polyamide.
5. A sole according to claim 4 wherein the woven fiber plies
comprise high-crystallized polymer fiber polyamide.
6. A sole according to claim 1 wherein the woven fiber plies have a
common weave pattern.
7. A sole according to claim 1 wherein the thickness of the sole is
in the range between 3 mm to 5 mm.
Description
TECHNICAL FIELD
[0001] The invention relates to flexible puncture resistant sole
for use in safety footwear to reduce the likelihood of injury, and
particularly a flexible sole made of alternating plies of woven
fabric and a flexible bonding agent material such as
thermo-formable resin, rubber or plastic.
BACKGROUND OF THE ART
[0002] The sole of footwear worn by people nowadays is often made
of resin material, such as foam rubber or plastics, and possibly
leather. Due to its elastic and pliable properties, it can provide
those who wear the shoes with soft and comfortable feeling. Yet,
conventional shoes also have some disadvantages. When the wearer
treads on sharp-pointed articles, such as metal nails, they can
easily pierce sole and injure the wearer's foot.
[0003] To prevent injury, some manufacturers mount a mild steel
sheet or stainless steel sheet on the sole to guard against
puncture or cutting injury of the foot. However, the relative
rigidity and inflexibility of the metal sheet causes the wearer
much inconvenience and the superior heat transfer properties of
metal generally make the wearer's feet too hot in hot environments
or too cold in cold environments. Metal sheets are relatively
difficult to properly bond to other footwear components with
adhesives, bonding agents or stitching for example.
[0004] An object of the invention is to provide a puncture
resistant sole structure that has improved flexibility, compatible
heat transfer characteristics and at an economic cost.
[0005] Further objects of the invention will be apparent from
review of the disclosure, drawings and description of the invention
below.
DISCLOSURE OF THE INVENTION
[0006] The invention provides a puncture and cut resistant
structure in a multi-ply sole of shoes formed of a number of woven
fabric layers and alternating plies of a flexible bonding agent,
such as resin, plastic or rubber adhered to each other in a
composite material. Preferably the composite material can be formed
by thermo compression of the woven ply and bonding agent with each
other. The material for the fiber woven ply may be a
high-crystallized polymer fiber of polyamide having a high shearing
strength and tensile strength, for example with tensile strength
being five times as strong as that of the mild steel wire. The
fiber woven ply may be woven with a common weave pattern where warp
and weft yarns alternate in a dense crisscross pattern, with the
function of inhibiting piercing or cutting. When in contact with
sharp-pointed articles, the woven ply being bonded with the bonding
agent or rubber ply by thermo compression serves to strengthen the
piercing resistance function of the composite layered material. The
bonding agent bonds the fibers of the woven ply together and fills
in voids between the woven fibers to inhibit movement of the fibers
which would permit a sharp point to penetrate the woven ply.
[0007] The sole is made of several woven plies laid upon one
another with bonding agent between them, such as rubber plies which
can be bonded together with thermo-compression. The overall
thickness of the combined fiber woven plies and rubber plies
thermo-compressed together is about from 3 mm to 5 mm.
[0008] When the sole of the present invention is used the wearer is
better protected from the risk of injury from sharp or pointed
articles while the sole can also be used as an ordinary sole or as
a shoe-pad. The composite puncture resistant sole can also be
disposed on the ordinary sole and the shoe-pad or otherwise
sandwiched in between the shoe-pad and the ordinary sole, so that
the overall thickness increased as well as the efficiency of
puncture and cut prevention. The sole of the present invention
feels lightweight and flexible in use while remaining strong to
resist injury.
DESCRIPTION OF THE DRAWINGS
[0009] In order that the invention may be readily understood, one
embodiment of the invention is illustrated by way of example in the
accompanying drawings.
[0010] FIG. 1 is an exploded view showing the multiple layers of
woven fabric and rubber as a bonding agent of which the sole is
manufactured;
[0011] FIG. 2 is a sectional view through a shoe with the sole of
the present invention treading on a sharp-pointed article;
[0012] FIG. 3 is a detailed sectional view of the woven and rubber
bonding agent layers bonded by thermo compression.
[0013] FIG. 4 is a perspective view showing the common weave or
crisscross weaving pattern of the woven layer.
[0014] Further details of the invention and its advantages will be
apparent from the detailed description included below.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0015] As shown in FIGS. 1-4, the present invention relates to a
puncture preventive structure for the sole of footwear, comprising
several woven fiber plies 1 and a layer of bonding agent such as
plastic or rubber plies 2 which can be bonded by mutual thermo
compression. The material for the woven fiber ply 1 is a
high-crystallized polymer fiber polyamide having high shear
strength and high tensile strength, for example with tensile
strength five times that of a mild steel wire. The woven fiber ply
1 is woven in a common or staggered densely crisscrossed pattern,
to improve the resistance to puncture by sharp-pointed articles.
The woven fiber plies 1 are bonded with the bonding agent ply 2
which can be rubber or plastic preferably by thermo-compression.
Through thermo compression the voids or gaps in the woven fiber ply
1 are filled and smoothed over by the infilling of the bonding
agent 2, and yarns or fibers are bonded together to resist movement
to strengthen the resistance to piercing of the composite layers.
When compared with a conventional sole made of a metal sheet, which
makes the wearer feel heavy and cumbersome, the softness and
flexibility of the woven fiber ply 1 and bonding agent or rubber
ply 2 in the sole of the present invention is advantageous, with a
high strength puncture resistive property.
[0016] The overall thickness of these woven fiber plies 1 and
rubber or plastic plies 2 thermo-compressed with one another is
about from 3 mm to 5 mm. When the present invention having a
thickness from 3 mm to 5 mm applies pressure to a nail tip of 0.8
mm diameter to make a piercing test, the pressure being applied
must be at least 120 Kg. Therefore, the present invention can be
pierced through when high loads are applied. Yet when a man or
woman is ordinarily walking, running or even making violent
movement such as jumping, the load applied by the foot when
touching the ground is far less than 120 kg.
[0017] Although the above description relates to a specific
preferred embodiment as presently contemplated by the inventor, it
will be understood that the invention in its broad aspect includes
mechanical and functional equivalents of the elements described
herein.
* * * * *