U.S. patent application number 10/367247 was filed with the patent office on 2004-08-19 for shoe insole with layered partial perforation.
Invention is credited to Dennis, Michael R., Monk, Russell A..
Application Number | 20040159015 10/367247 |
Document ID | / |
Family ID | 32849937 |
Filed Date | 2004-08-19 |
United States Patent
Application |
20040159015 |
Kind Code |
A1 |
Dennis, Michael R. ; et
al. |
August 19, 2004 |
Shoe insole with layered partial perforation
Abstract
A shoe insole which, within a shoe, combines shock cushioning,
heat dissipating, moisture-removing, and low-frictioning contact
with the underside of the foot. The insole preferably includes two
adhesively bonded layers. The lower layer is a shock-cushioning
layer which includes plural, elongate, through-bore perforations
that are distributed in a grid fashion throughout the layer, with
each perforation extending completely through the thickness of this
lower layer, and opening to opposite (upper and lower) faces in the
lower layer. The upper layer is a continuous, non-perforated
moisture-wicking, low-frictioning, fabric layer which extends
across and spans the upper, otherwise open ends of the
perforations.
Inventors: |
Dennis, Michael R.;
(Scappoose, OR) ; Monk, Russell A.; (Salem,
OR) |
Correspondence
Address: |
ROBERT D. VARITZ, P.C.
2007 S.E. Grant Street
Portland
OR
97201
US
|
Family ID: |
32849937 |
Appl. No.: |
10/367247 |
Filed: |
February 14, 2003 |
Current U.S.
Class: |
36/44 ;
36/3B |
Current CPC
Class: |
A43B 7/34 20130101; A43B
17/102 20130101; A43B 17/08 20130101; A43B 17/02 20130101 |
Class at
Publication: |
036/044 ;
036/003.00B |
International
Class: |
A43B 013/38 |
Claims
We claim:
1. A shoe insole comprising a cushioning underlayer having upper
and lower faces which constitute opposite faces in this layer,
plural perforations extending through, and opening to opposite
faces of, said cushioning layer, and an overlayer expanse of
low-frictioning, moisture-wicking, fabric material distributed as a
continuum over the upper face of said cushioning layer, and
effectively completely spanning said perforations where they open
to and are exposed at the upper face of said cushioning layer.
2. The insole of claim 1, wherein said cushioning layer is formed
of an acceleration-rate-sensitive, viscoelastic material.
3. The insole of claim 1, wherein said cushioning layer and said
fabric overlayer are joined to one another through adhesive
bonding.
4. The insole of claim 1, wherein said perforations are distributed
in a uniform grid pattern over and through said cushioning
layer.
5. The insole of claim 4, wherein said perforations are generally
cylindrical in nature, with their respective axes of cylindrical
symmetry extending through said cushioning layer between its upper
and lower faces.
Description
INTRODUCTION
[0001] This invention relates to a shock-absorbing, cushioning
insole for a shoe, and more particularly to such an insole which,
in addition to possessing a structure capable of furnishing
superior shock-absorbing performance, is also specially constructed
to dissipate heat very efficiently and effectively.
[0002] The environment inside the usual worn shoe is, generally
speaking, a very warm environment. With regard to shoes that are
designed for, and that work to promote, vigorous activity such as
exercise walking and running, it is common for wearers to seek, or
if necessary to equip, shoes with special shock-absorbing
cushioning insoles (or the like) which significantly enhance the
wearer's/user's comfort. Other activities, including various
therapeutic, walking-related activities, which do not necessarily
entail strenuous and/or pounding foot behavior, are also often made
more comfortable, acceptable and effective where a cushioning
insole, etc., structure, like that just above mentioned, is present
in a shoe.
[0003] A sometimes encountered side effect, however, to the
presence of such cushioning structure in a shoe is an accompanying
increased build-up of heat within the shoe, resulting from
additional heat that becomes generated therein because of the
active "working" which takes place within the included
shock-absorbing cushioning material.
[0004] There is thus a strong interest in many instances to provide
a shoe, for use in activity circumstances like those generally
mentioned above, with an effective shock-absorbing cushioning
capability which is also characterized by robust heat-removal that
can deal definitively with potential additional heat build-up which
may occur as a consequence of active and efficient cushioning and
shock absorption.
[0005] In this setting, the present invention proposes a unique and
strikingly effective shoe insole structure which features a pair of
(upper and lower) preferably bonded layers, the lower one of which
is formed of an acceleration-rate-sensitive, viscoelastic,
cushioning and shock-absorbing material, and the upper one of which
is formed of an overlayer of a suitable, low-friction,
moisture-wicking fabric material.
[0006] The upper layer of fabric material, which possesses
significant low-frictioning and moisture-wicking properties, is
formed as a continuous (unbroken) expanse. The lower layer of
cushioning material, in accordance with the present invention, is
characterized with a unique distribution of through-layer (from top
to bottom) perforations that are distributed as clear,
though-bore-like, preferably (though not at all necessarily)
cylindrical passages that open to both faces (upper and lower) in
the cushioning material. Significantly, however, no through-bore
perforations extend through the overlayer fabric material, which
material completely spans (unperforated) each of the otherwise open
upper-surface ends of the through-bore perforations in the
cushioning material.
[0007] This special, perforate-single-layer, fabric-bridged insole
structure offers a robust cooling behavior which remarkably
divorces the high-performance, high-capability cushioning and
shock-absorbing performance of a material, like the preferred
acceleration-rate-sensitive viscoelastic material mentioned above,
from the attendant heat build-up side effects which can be
generated.
[0008] These and other features and advantages that are attained by
the present invention will become more fully apparent as the
description which now follows is read in conjunction with the
accompanying drawings.
DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is an isolated top plan view of a shoe insole
constructed in accordance with a preferred embodiment of the
present invention. Portions of a fabric overlayer are broken away
in order to reveal underlying details of construction.
[0010] FIG. 2 is an enlarged, fragmentary, cross-sectional view
taken generally along the line 2-2 in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
[0011] Turning now to both drawing figures, indicated generally at
10 is a cushioning, heat-dissipating shoe insole which is
constructed fully in accordance with a preferred and best mode
embodiment of the present invention. Insole 10 is illustrated in an
isolated condition herein, separated from other shoe structure
simply for the sake of convenience in picturing and describing it.
It will be understood, of course, that this insole structure may
either indeed be a "stand alone" structure which is selectibly
insertable into an independent shoe, or it may be a structure which
is built as an integral part originally of a shoe. The upper side,
or surface, of insole 10 faces the viewer in FIG. 1, and is
disposed at the upper side of FIG. 2.
[0012] Preferably, insole 10 is a two-layer structure, including a
lower, shock-absorbing, impact-cushioning layer 12, and an upper,
moisture-wicking, low-friction fabric layer 14 which is bonded as
an unbroken, uninterrupted overlayer on the upper surface of layer
12.
[0013] While different very specific cushioning, etc. materials may
be chosen for layer 12, most preferably all such selections lie in
the category of an acceleration-rate-sensitive, viscoelastic
material. A very satisfactory, and currently most preferred,
material choice for layer 12 is the material which is identified as
PORON.RTM. 400 Performance Urethane, Series 90, Formation #94. This
particular material is manufactured by Rogers Corporation in
Woodstock, Conn. A preferred thickness T for this layer lies in the
range of about 1/8-1/4-inches. A thickness of about {fraction
(3/16)}-inches has been found to be a very good choice within this
range.
[0014] According to the invention, layer 12 is perforated by a
uniform, overall grid pattern of plural, generally cylindrical,
through-bore passages 16, each of which opens to both the upper and
the lower surfaces (12a, 12b, respectively) of layer 12. Each of
these passages has an axis, such as axes 16a, of cylindrical
symmetry that extends as shown between the upper and lower faces of
layer 12. While different specific perforation dimensions and
center-to-center spacings of perforations, may be selected, in
insole 10, perforations 16 have cross-sectional diameters D each of
about 0.05-inches, and center-to-center spacings S of about
0.25-inches. As was mentioned earlier, non-cylindrical perforations
may be used if desired.
[0015] Fabric overlayer 14 is preferably formed of a woven-fibre
fabric material, such as that known as HEATHERSTONE.RTM., made by
Lee Fashion Fabrics, Inc. in Gloversville, N.Y. This material
possesses excellent moisture-wicking and low-frictioning
properties. Fabric layer 14 herein has a thickness preferably of
about {fraction (1/64)}-inches.
[0016] Layer 14 is suitably bonded, as by an appropriate adhesive
18, to the upper surface of layer 12, and completely over-spans the
otherwise open upper ends of perforations 16. Significantly,
perforations 16 do not have upper extensions through the fabric
layer. Such extensions would inevitably result in exposed
fabric-thread ends which, among other undesirable things, would be
subject to fraying, and could result in tattering and
disintegration of the fabric overlayer. In addition, perforation
extensions through the fabric layer will significantly degrade the
overlayer's moisture-wicking capabilities by the fact that there
would be introduced to it numerous and widely distributed
discontinuities in the preferable, desirable, unbroken continuity
expanse for moisture wicking which occurs where such extensions do
not exist. Still another potentially significant drawback to
perforations in the fabric material, stemming from tattering and
fraying, is that the exposed, scattered ends of broken fabric
threads could appreciably reduce the otherwise desirable
low-frictioning characteristic of the fabric.
[0017] Experience with the insole structure of this invention, now
fully described, is that it furnishes both very significant
cushioning and shock-absorbing performance, while at the same time
offering significant heat dissipation and moisture removal. Such
very appreciable heat-removal performance is one that (a) not only
deals robustly with the expected, normal heat build-up in a working
shoe, but also (b) significantly obviates the additional heat
build-up which accompanies, as an unwelcome side effect, the
energetic working shock-absorbing and cushioning behavior
definitively called upon, and desired from, the viscoelastic
cushioning layer.
[0018] Accordingly, while a preferred embodiment of the invention
has been illustrated and described herein, it is appreciated that
variations and modifications may be made without departing form the
spirit of the invention.
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