U.S. patent application number 09/996398 was filed with the patent office on 2003-05-29 for boot liner with gel pads.
Invention is credited to Baek, Jai K..
Application Number | 20030097768 09/996398 |
Document ID | / |
Family ID | 25542873 |
Filed Date | 2003-05-29 |
United States Patent
Application |
20030097768 |
Kind Code |
A1 |
Baek, Jai K. |
May 29, 2003 |
Boot liner with gel pads
Abstract
A boot with a resilient pad fixed inside the cloth and foam
layers forming the toe box.
Inventors: |
Baek, Jai K.; (San Diego,
CA) |
Correspondence
Address: |
Crockett & Crockett
Suite 400
24012 Calle De La Plata
Laguna Hills
CA
92653
US
|
Family ID: |
25542873 |
Appl. No.: |
09/996398 |
Filed: |
November 28, 2001 |
Current U.S.
Class: |
36/55 ; 36/71;
36/93 |
Current CPC
Class: |
A43B 23/086 20130101;
A43B 7/32 20130101; A43B 5/0405 20130101; A43B 23/16 20130101 |
Class at
Publication: |
36/55 ; 36/71;
36/93 |
International
Class: |
A43B 023/07; A43B
019/00 |
Claims
I claim:
1. A boot comprising an outer shell and a boot liner, wherein the
boot liner is adapted to be disposed within the outer shell during
use, and wherein the boot liner comprises: an upper, a sole
disposed beneath the upper, a toe box disposed in the forward
portion of the upper and above the sole, a heel counter area
disposed in the rearward portion of the upper, an cover disposed on
the outside of the upper, a first layer of resilient material
disposed within the outer cover, a second layer of resilient
material disposed within said first layer of resilient material,
and an inner lining disposed within said second layer of resilient
material; and a resilient pad disposed in the toe box, said
resilient pad fixed between the outer cover and the inner lining of
the toe box.
2. A boot as in claim 1 wherein the resilient pad comprises a
mixture of styrene and 1,3-butadiene.
3. A boot as in claim 1 where the durometer value of the toe box as
measured from the inner lining to the outer cover is about 14
(Shore A).
4. A boot as in claim 1 where the durometer value of the toe box as
measured from the outer cover to the inner lining is about 18
(Shore A).
5. A boot as in claim 1, wherein said resilient pad is fixed in the
toe box between the first layer of resilient material and the
second layer of resilient material.
6. A boot as in claim 1 wherein said resilient pad is fixed in the
toe box between the cover and the first layer of resilient
material.
7. A boot as in claim 1, wherein said resilient pad is fixed in the
toe box between the second layer of resilient material and the
inner lining.
8. A boot as in claim 1, wherein said resilient pad is fixed
outside the cover of the toe box of the boot liner.
9. A boot as in claim 1 further comprising: a third layer of
resilient material disposed between the first and second layers of
resilient material, where said third layer of resilient material is
further disposed in the rear portion of the boot; and, a resilient
heel pad disposed in the heel counter area, said resilient heel pad
fixed between the outer cover and the inner lining.
10. A boot as in claim 9 wherein the resilient pad comprises a
mixture of styrene and 1,3-butadiene.
11. A boot as in claim 9 where the durometer value of the heel
counter area, as measured from the inner lining to the outer cover,
is about 6 (Shore A).
12. A boot as in claim 9 where the durometer value of the heel
counter area, as measured from the outer cover to the inner lining
is about 48 (Shore A).
13. A boot as in claim 9, wherein said resilient heel pad is fixed
between the first layer of resilient material and the outer
cover.
14. A boot as in claim 9, wherein said resilient heel pad is fixed
between the first layer of resilient material and the second layer
of resilient material.
15. A boot as in claim 9, wherein said resilient heel pad is fixed
between the second layer of resilient material and the third layer
of resilient material.
16. A boot as in claim 9, wherein said resilient heel pad is fixed
between the third layer of resilient material and the inner
lining.
17. A boot as in claim 9, wherein said resilient heel pad is fixed
outside the heel counter area.
18. A boot characterized by a sole and an upper, said upper further
characterized by an instep area and a toe box located at the front
of the upper forward of the instep area and having a rear boundary
forward of the instep area, wherein the toe box area comprises: a
first layer of resilient material, a second layer of resilient
material, and a gel pad disposed between the first layer of
resilient material and the second layer of resilient material.
19. The boot of claim 18 wherein the gel pad is comprised of
styrene butadiene rubber.
20. The boot of claim 18 wherein the gel pad does not extend
substantially rearwardly of the toe box.
21. The boot of claim 18 wherein the gel pad extends rearwardly
from the tip of the toe box and terminates at a point forward of
the instep.
22. The boot of claim 18 wherein the durometer value of the toe
box, as measured from the inside of the boot lining, is about
14.
23. A boot characterized by a sole and an upper, said upper further
characterized by an ankle area, an arch area, an instep area, and a
heel counter area located at the rear of the upper rearward of the
ankle area and arch area, wherein the heel counter area comprises:
a first layer of resilient material and a second layer of resilient
material, and a gel pad disposed between the first layer of
resilient material and the second layer of resilient material.
24. The boot of claim 23 wherein the gel pad is comprised of
styrene butadiene rubber.
25. The boot of claim 23 wherein the gel pad does not extend
substantially forward of the heel counter area.
26. The boot of claim 23 wherein the gel pad extends forwardly from
rear of the heel counter area and terminates at a point behind the
arch area.
27. The boot of claim 23 wherein the durometer value of the heel
counter area, as measured from the inside of the boot lining, is
about 6.
Description
FIELD OF THE INVENTIONS
[0001] The inventions relate generally to footwear, such as shoes,
boots, boot liners, and specifically to ski boots or snow boarding
boots designed to provide comfort and protection to the wearer by
use of a gel pad in front of and above the toe and a gel pad behind
the heel.
BACKGROUND OF THE INVENTIONS
[0002] Anyone who skis or snowboards has felt the pain of jamming
their toes and heels against the inside of their boots. The boot
described below provides a good solution to the problem.
[0003] Snowboard and ski boots are usually made of a combination of
a boot liner and a boot shell. Though the boot liner may be made of
various layers of foam, they don't absorb enough of the impact to
alleviate the problem. The foam of the liner is typically so soft
that it offers insufficient impact absorption. Essentially the
skier's toes impact the outer shell with only a completely
compressed layer of foam in between, which is painful and can cause
injuries.
[0004] Kunesh, Two Ply Inflatable Sock, U.S. Pat. No. 5,596,770,
(Jan. 28, 1997), describes placing an adjustable air bladder
partially filled with plastisol or hydrogel into the linings of a
sock to increase comfort and reduce blisters. However, the sock
described in Kunesh is too soft for use in a ski boot. To control
skis or a snowboard the wearer translates force through the boot to
the skis or snowboard. The sock described in Kunesh would make ski
or snowboard control difficult since it provides too much padding;
essentially, the extra padding muffles the control force exerted by
the wearer.
[0005] Wagonhurst, Size-Adjustable Footwear, U.S. Pat. No.
6,082,027 (Jul. 4, 2000), describes the use of a releasably
attachable foam insert to adjust the size of the inside of a boot.
Wagonhurst seeks to find ways to accommodate different foot sizes
with the same boot. Because Wagonhurst teaches the use of foam
inserts to accommodate feet of different sizes, the inserts are
designed to be compressible. Compressible liners become compressed
in high impact environments and do not adequately protect a
wearer's toes.
SUMMARY
[0006] The boots described below alleviate the problem of pain and
risk of injury during an impact while wearing a snowboard or ski
boot. Placing a soft gel pad made of SBR or similarly resilient
material between the foam and cloth layers forming the toe box
provides substantial protection to the wearer's toes from impacts
without reducing comfort or performance. To provide maximum
protection the pad covers the entire front and top of the toe box.
The pad fits snugly between foam layers of the toe box, or anywhere
between the inner and outer cloth linings of the boot liner, and a
glue further secures the pad within the cavity. The gel pad does
not extend into the vamp or instep of the boot, so there is no
deleterious effect on the transfer of force from the users foot to
the boot as needed to control a ski or snowboard bound to the boot.
Likewise, a gel pad is inserted in the boot liner in the heel
counter area, providing protection from the impact of the wearer's
heel with the heel counter area of the boot, and the gel pad in the
heel does not extend forwardly or upwardly into the ankle or arch
areas of the boot to avoid mitigating the transfer of forces needed
to control skis or snowboards.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is an overview of a boot liner disposed within an
outer boot shell.
[0008] FIG. 2 is a cross section of the boot liner showing a
placement of the gel pads within the boot liner.
[0009] FIGS. 3 and 4 are views of the heel gel pad.
[0010] FIGS. 5 and 6 are views of the gel pad.
DETAILED DESCRIPTION OF THE INVENTIONS
[0011] FIG. 1 shows an overview a boot 1 that includes boot liner 2
disposed within an outer boot shell 3. The boot may be used as a
ski boot, a snowboard boot, an ice skate boot, or any other kind of
boot. The outer boot shell 3 may be provided with fittings to allow
it to be removably attached to skis, a snowboard, or the like. The
inner boot liner 2 is removably disposed within the outer boot
shell 3. Alternatively, the inner boot liner 2 is fixed within the
outer boot shell 3. The outer boot shell 3 includes an outer shell
toe box 4, the outer shell vamp 5, the outer shell heel counter
area 6, the outer shell ankle area 7, and the outer shell upper
8.
[0012] FIG. 2 is a cross section of a boot liner illustrating its
components. An upper 9 and a sole 10 form the liner. The upper 9
includes a vamp 12, a toe box 14, a heel 15, and a heel counter
area 16. Other areas of the boot include the arch area 18, which
corresponds to the arch of the foot, and the ankle area, indicated
by the phantom circle 19, which corresponds to the area near the
ankle bones of the wearer.
[0013] The vamp 12 is the portion of the boot liner upper near the
instep of the boot, rearward of the toe box, and corresponding to
the instep of the wearer, located posterior to the toe box 14. The
toe box 14 is that portion of the boot that accommodates the toes
of the wearer. The heel counter area 16 corresponds to the back of
the heel of the wearer and is the area where a counter is typically
placed in or on shoes and boots to provide stiff support in the
back of the shoe upper. The neck 11 has an opening extending
rearwardly from the vamp 12. The vamp 12 slopes downwardly towards
either side of the boot in an arcuate path until each side meets
the sole 10. The sole 10 is disposed beneath the vamp 12 and the
toe box 14 to form a foot-shaped cavity which accommodates the
wearer's foot. The various portions of the boot liner may be
stitched or sewn together, glued together, or formed integrally
with each other.
[0014] The boot liner is composed of several layers of cloth, foam
rubber, latex, and gel which vary in dimension and composition in
different parts of the boot. Referring to the front of the boot,
the toe box 14 is formed with four layers of cloth and foam,
including a cover 20, an outer foam layer 21, an inner foam layer
22, and a lining 23. The cover 20 is a heavy cloth, such as mesh or
fleece, but could also be cordura, plastic, synthetic leather, or
action nubuck. The cover 20 may include several additional layers
to create an outwardly attractive appearance. Preferably, when made
in combination with all the specified elements of the boot liner,
the foam layers 21 and 22 comprises polyethylene, but may also
comprise ethyl vinyl acetate (EVA), latex, or polyurethane
foam.
[0015] A gel pad 25 is disposed between the two foam layers of the
toe box, secured by an adhesive. The gel pad 25 forms an arcuate
path from the region forward of the vamp 12, forwardly over the top
of the toe box 14, across the width of the toe box 14, and to the
bottom of the toe box at the sole 10. The gel pad 25 extends around
the tip of the toe box 14 laterally such that the entire front end
of the toe box is protected by the gel pad 25. The gel pad 25 is
tapered at the edges and is thickest in the center, where the front
of the toes would impact when the foot suddenly shifts forward in
the boot. The gel pad 14 comprises styrene and 1,3-butadiene
(styrene butadiene rubber, also referred to as SBR) or similar
resilient soft rubber or elastomeric compound. The gel pad has an
overall durometer value of less than 0 (Shore A).
[0016] Note that placing the gel pad 25 inside the foam layers of
the toe box 14 tightly secures it, making slippage unlikely even
under high impacts or high shear forces. In addition, by placing
the pad 25 over the entire toe box 14 all parts of the toes are
protected. If the toes jam forward during a high impact then the
pad helps protect the joints and top part of the toes, even if the
toes crumple around the joints.
[0017] Referring to the rear of the boot, the cover may be the same
as the cover on the front of the boot. Disposed inside the outer
cover 20, and secured with a suitable glue, is an outer foam layer
21 made from ethyl vinyl acetate (EVA), latex, polyethylene or
polyurethane foam. Preferably, when made in combination with all
the specified elements of the boot liner, the outer foam layer 21
comprises polyethylene. Disposed inside the outer foam layer 21 is
a middle foam layer 27 made from ethyl vinyl acetate (EVA), latex,
or polyurethane foam, secured with a suitable glue to the outer
cover. Preferably, when made in combination with all the specified
elements of the boot liner, the middle foam layer 27 comprises
polyurethane foam. Disposed inside the middle foam layer 27 is an
inner foam layer 22 made from ethyl vinyl acetate (EVA), latex,
polyethylene, or polyurethane foam secured with a suitable glue to
the middle foam layer. Preferably, when made in combination with
all the specified elements of the boot liner, the inner foam layer
22 comprises polyethylene. Disposed inside the inner foam layer 22
is an inner lining 23, made of spandex or low pile fabric, secured
to the inner foam layer with a suitable glue. Inserted into the
heel counter area 16 is a heel gel pad 30 composed of styrene and
1,3-butadiene (styrene butadiene rubber) with an overall durometer
value of less than 0 (Shore A). The heel gel pad 30 is disposed
between the inner foam layer 22 and the middle foam layer 27.
[0018] Note that both the gel pad 14 and the heel gel 30 pad are
beveled such that the upper and lower parts of the pads, as seen
from the bottom of the heel to the top, are thicker than the
central portion. This beveling provides maximum protection to the
heel, yet minimizes the space required for the pad and provides for
a smooth transition between padded and unpadded portions of the
boot. It also tends to "hug" the heel and thereby increase
comfort.
[0019] The overall durometer values of various locations on the
boot may be adjusted to fall within certain parameters to maximize
protection and comfort. All of the durometer values given in this
specification were taken on a sample of a boot liner manufactured
by the Applicant. The testing performed was to measure durometer
(Shore) hardness per ASTM D 2240. The testing procedures were
according to the ASTM D 2440-97.sup.e1 test method.
[0020] The overall durometer value of the toe box 14 is, as
measured from the inside of the boot to the outside, about 14
(Shore A) and in the range from about 7 (Shore A) to about 21
(Shore A). As measured from the outside of the boot to the inside
the durometer value of the toe box 14 is 18 (Shore A) and in the
range from about 9 (Shore A) to about 27 (Shore A).
[0021] The heel counter area 16 has an overall durometer value, as
measured from the inside of the boot to the outside, of about 6
(Shore A) and in the range from about 3 (Shore A) to about 9 (Shore
A). As measured from the outside of the boot to the inside the
durometer value the heel counter area 16 is about 48 (Shore A) and
in the range from about 24 (Shore A) to about 72 (Shore A).
[0022] At the ankle area 19 the overall durometer value, as
measured from the inside of the boot to the outside, is about 6
(Shore A) and in the range of about 3 (Shore A) to about 9 (Shore
A). As measured from the outside of the boot to the inside the
durometer value at the ankle area is about 50 (Shore A) and in the
range from about 25 (Shore A) to about 75 (Shore A).
[0023] At the center of the vamp 12 the overall durometer value, as
measured from the inside of the boot to the outside, is about 9
(Shore A) and in the range of about 4 (Shore A) to about 13 (Shore
A). As measured from the outside of the boot to the inside the
durometer value of the vamp is about 17 (Shore A) and in the range
from about 8 (Shore A) to about 26 (Shore A).
[0024] FIGS. 3 and 4 show the heel gel pad 30. The heel gel pad 30
is shaped to afford protection to the back of the heel without
making it so bulky as to cause discomfort to the wearer. The
central contour line 36 shows where beveling begins. From that
point the heel gel pad 30 tapers until it reaches the pad edge 37,
which is thinner than the center of the pad 38.
[0025] FIGS. 5 and 6 show the gel pad 25. Like the heel gel pad 30,
the gel pad 25 is shaped to afford protection to the toes without
making the boot so bulky as to cause discomfort to the wearer. The
central contour line 39 shows where beveling begins. From that
point the gel pad 25 tapers until it reaches the forward pad edge
40, which is thinner than the center of the pad 41. However, the
gel pad is more pointed at the outer edges 42 to better fit the toe
box. Thus, the flat pad edge 43, also thinner than the pad center
41, is more narrow than the rounded pad edge 40.
[0026] While the gel pad 25 and heel gel pad 30 are shown embedded
between the layers of the boot liner, they may be placed in other
positions relative to the boot liner or boot liner layers. The gel
pads for the heel 30 may be secured between the boot liner heel
counter area 16 and the outer boot shell heel counter area 6, or
inside the boot liner heel counter area 16. Likewise, the gel pad
25 for the toe may be secured between the boot liner toe box 14 and
the outer shell toe box 4, or anywhere between the various layers
of the boot liner toe box 14. The pad may also be secured to
corresponding locations on the inside of the outer shell. However,
placement of the gel pads 30 and 25 between various layers of the
boot liner protects the pad itself from wear and tear during the
use of the boot.
[0027] Thus, while the preferred embodiments of the devices and
methods have been described in reference to the environment in
which they were developed, they are merely illustrative of the
principles of the inventions. Other embodiments and configurations
may be devised without departing from the spirit of the inventions
and the scope of the appended claims.
* * * * *