U.S. patent application number 12/455350 was filed with the patent office on 2009-10-01 for athletic shoe.
This patent application is currently assigned to AKEVA L.L.C.. Invention is credited to Tuan N. Le, David F. Meschan.
Application Number | 20090241375 12/455350 |
Document ID | / |
Family ID | 46321599 |
Filed Date | 2009-10-01 |
United States Patent
Application |
20090241375 |
Kind Code |
A1 |
Meschan; David F. ; et
al. |
October 1, 2009 |
Athletic shoe
Abstract
A shoe including a heel support integrally formed of a material
different from the midsole material of a rear sole for supporting
the foot of a user. The heel support includes a wall along at least
one of the medial side of the shoe, the lateral side of the shoe
and the rear of the shoe that extends vertically at least in part
and includes at least one window through which at least a portion
of the midsole material of the rear sole is exposed to and visible
from outside the shoe.
Inventors: |
Meschan; David F.;
(Greensboro, NC) ; Le; Tuan N.; (Portland,
OR) |
Correspondence
Address: |
MARTIN & FERRARO, LLP
1557 LAKE O'PINES STREET, NE
HARTVILLE
OH
44632
US
|
Assignee: |
AKEVA L.L.C.
|
Family ID: |
46321599 |
Appl. No.: |
12/455350 |
Filed: |
June 1, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10882729 |
Jun 30, 2004 |
7540099 |
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12455350 |
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10447003 |
May 28, 2003 |
7114269 |
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10882729 |
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10007535 |
Dec 4, 2001 |
6604300 |
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10447003 |
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09641148 |
Aug 17, 2000 |
6324772 |
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10007535 |
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09512433 |
Feb 25, 2000 |
6195916 |
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09641148 |
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09313667 |
May 18, 1999 |
6050002 |
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09512433 |
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08723857 |
Sep 30, 1996 |
5918384 |
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09313667 |
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08291945 |
Aug 17, 1994 |
5560126 |
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08723857 |
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Current U.S.
Class: |
36/91 ; 36/29;
36/35R; 36/92 |
Current CPC
Class: |
A43B 3/0042 20130101;
A43B 7/142 20130101; A43B 21/36 20130101; A43B 13/26 20130101; A43D
999/00 20130101; A43B 7/144 20130101; A43B 5/00 20130101; A43B
21/52 20130101; A43B 21/26 20130101; A43B 21/433 20130101 |
Class at
Publication: |
36/91 ; 36/29;
36/35.R; 36/92 |
International
Class: |
A43B 7/14 20060101
A43B007/14; A43B 13/20 20060101 A43B013/20; A43B 21/28 20060101
A43B021/28 |
Claims
1. A shoe comprising: a bottom, a medial side, a lateral side and a
rear; an upper having a forward region, an arch region and a heel
region; a forward sole secured below the forward region of the
upper, the forward sole having a bottom surface that is at least in
part ground-engaging; a rear sole secured below the heel region of
the upper, the rear sole including a midsole material, the rear
sole having a bottom surface that is at least in part
ground-engaging; a heel support integrally formed of a material
different from the midsole material of the rear sole, the heel
support including a wall along at least one of the medial side of
the shoe, the lateral side of the shoe and the rear of the shoe,
the wall extending vertically at least in part and being exposed to
and visible from outside the shoe, the wall including a top, a
bottom and at least one window in the wall between the top and the
bottom of the wall, at least a portion of the midsole material of
the rear sole being exposed to and visible from outside the shoe
through the at least one window in the wall, the heel support
including a rim proximate the top of the wall, the rim extending
inwardly at least in part and having a lower surface oriented
toward at least a portion of the bottom of the shoe; and an arch
bridge integrally formed with the heel support, the arch bridge
including a lower surface having a portion that is
non-ground-engaging, the non-ground-engaging portion of the lower
surface of the arch bridge being visible from the bottom of the
shoe between the ground-engaging surfaces of the forward sole and
the rear sole.
2. The shoe of claim 1, further including a substantially air-tight
enclosure located at least in part between a portion of the upper
and a portion of the bottom of the shoe, the air-tight enclosure
having a top, a bottom and a vertical central axis passing through
the top and the bottom of the air-tight enclosure.
3. The shoe of claim 2, wherein the air-tight enclosure is located
in the forward sole.
4. The shoe of claim 2, wherein a portion of the air-tight
enclosure is at least in part curved.
5. The shoe of claim 4, wherein the at least in part curved portion
of the air-tight enclosure is curved in a direction substantially
perpendicular to the vertical central axis of the air-tight
enclosure.
6. The shoe of claim 4, wherein the at least in part curved portion
of the air-tight enclosure is curved in a direction substantially
parallel with the vertical central axis of the air-tight
enclosure.
7. The shoe of claim 4, wherein the at least in part curved portion
of the air-tight enclosure is curved in a direction substantially
parallel with the vertical central axis of the air-tight enclosure
and in a direction substantially perpendicular to the vertical
central axis of the air-tight enclosure.
8. The shoe of claim 4, wherein the at least in part curved portion
of the air-tight enclosure is arcuate in shape in a direction
substantially perpendicular to the vertical central axis of the
air-tight enclosure.
9. The shoe of claim 4, wherein the at least in part curved portion
of the air-tight enclosure is arcuate in shape in a direction
substantially parallel with the vertical central axis of the
air-tight enclosure.
10. The shoe of claim 4, wherein the at least in part curved
portion of the air-tight enclosure is arcuate in shape in a
direction substantially parallel with the vertical central axis of
the air-tight enclosure and in a direction substantially
perpendicular to the vertical central axis of the air-tight
enclosure.
11. The shoe of claim 2, wherein at least one of the top and the
bottom of the air-tight enclosure has a portion that is generally
flat and perpendicular to the vertical central axis of the
air-tight enclosure when the shoe is in an unloaded state.
12. The shoe of claim 2, wherein each of the top and the bottom of
the air-tight enclosure has a portion that is generally flat and
perpendicular to the vertical central axis of the air-tight
enclosure when the shoe is in an unloaded state.
13. The shoe of claim 2, wherein at least a portion of the bottom
of the air-tight enclosure is generally flat and perpendicular to
the vertical central axis of the air-tight enclosure when the shoe
is in an unloaded state.
14. The shoe of claim 2, wherein at least a portion of the top of
the air-tight enclosure is generally flat and perpendicular to the
vertical central axis of the air-tight enclosure when the shoe is
in an unloaded state.
15. The shoe of claim 2, wherein at least a portion of the
air-tight enclosure is transparent.
16. The shoe of claim 2, wherein the air-tight enclosure has at
least one exterior portion that is exposed to and visible from
outside the shoe.
17. The shoe of claim 1, further including an inflated cushion
located at least in part between a portion of the upper and a
portion of the bottom of the shoe, the inflated cushion having a
top, a bottom and a vertical central axis passing through the top
and the bottom of the inflated cushion.
18. The shoe of claim 17, wherein the inflated cushion is located
in the forward sole.
19. The shoe of claim 17, wherein the inflated cushion includes a
bladder.
20. The shoe of claim 19, wherein the bladder is an air bladder.
Description
[0001] This is a continuation of application Ser. No. 10/882,729,
filed Jun. 30, 2004, now U.S. Pat. No. 7,540,099; which is a
continuation of application Ser. No. 10/447,003, filed May 28,
2003, now U.S. Pat. No. 7,114,269; which is a continuation of
application Ser. No. 10/007,535, filed Dec. 4, 2001, now U.S. Pat.
No. 6,604,300; which is a continuation of application Ser. No.
09/641,148, filed Aug. 17, 2000, now U.S. Pat. No. 6,324,772; which
is a continuation of application Ser. No. 09/512,433, filed Feb.
25, 2000, now U.S. Pat. No. 6,195,916; which is a continuation of
application Ser. No. 09/313,667, filed May 18, 1999, now U.S. Pat.
No. 6,050,002; which is a continuation of application Ser. No.
08/723,857, filed Sep. 30, 1996, now U.S. Pat. No. 5,918,384; which
is a CIP of Ser. No. 08/291,945, filed Aug. 17, 1994, now U.S. Pat.
No. 5,560,126; all of which are incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates generally to an improved rear
sole for footwear and, more particularly, to a rear sole for an
athletic shoe with an extended and more versatile life and better
performance in terms of cushioning and spring.
[0004] 2. Description of the Prior Art
[0005] Athletic shoes, such as those designed for running, tennis,
basketball, cross-training, hiking, walking, and other forms of
exercise, typically include a laminated sole attached to a soft and
pliable upper. The laminated sole generally includes a resilient
rubber outsole attached to a more resilient midsole usually made of
polyurethane, ethylene vinyl acetate (EVA), or a rubber compound.
When laminated, the sole is attached to the upper as a one-piece
structure, with the rear sole being integral with the forward
sole.
[0006] One of the principal problems associated with athletic shoes
is outsole wear. A user rarely has a choice of running surfaces,
and asphalt and other abrasive surfaces take a tremendous toll on
the outsole. This problem is exacerbated by the fact that most
pronounced outsole wear, on running shoes in particular, occurs
principally in two places: the outer periphery of the heel and the
ball of the foot, with peripheral heel wear being, by far, a more
acute problem. In fact, the heel typically wears out much faster
than the rest of a running shoe, thus requiring replacement of the
entire shoe even though the bulk of the shoe is still in
satisfactory condition.
[0007] Midsole compression, particularly in the case of athletic
shoes, is another acute problem. As previously noted, the midsole
is generally made of a resilient material to provide cushioning for
the user. However, after repeated use, the midsole becomes
compressed due to the large forces exerted on it, thereby causing
it to lose its cushioning effect. Midsole compression is the worst
in the heel area, including the area directly under the user's heel
bone and the area directly above the peripheral outsole wear
spot.
[0008] Despite technological advancements in recent years in
midsole design and construction, the benefits of such advancements
can still be largely negated, particularly in the heel area, by two
months of regular use. The problems become costly for the user
since athletic shoes are becoming more expensive each year, with
some top-of-the-line models priced at over $150.00 a pair. By
contrast, with dress shoes, whose heels can be replaced at nominal
cost over and over again, the heel area (midsole and outsole) of
conventional athletic shoes cannot be. To date, there is nothing in
the art that successfully addresses the problem of midsole
compression in athletic shoes, and this problem remains especially
severe in the heel area of such shoes.
[0009] Another problem is that purchasers of conventional athletic
shoes cannot customize the cushioning or spring in the heel of a
shoe to their own body weight, personal preference, or need. They
are "stuck" with whatever a manufacturer happens to provide in
their shoe size.
[0010] Finally, there appear to be relatively few, if any, footwear
options available to those persons suffering from foot or leg
irregularities, foot or leg injuries, and legs of different
lengths, among other things, where there is a need for the left and
right rear soles to be of a different height and/or different
cushioning or spring properties. Presently, such options appear to
include only custom-made shoes that are prohibitively expensive and
rendered useless if the person's condition improves or
deteriorates.
SUMMARY OF THE INVENTION
[0011] The present invention is directed to a shoe that
substantially obviates one or more of the problems due to
limitations and disadvantages of the related art.
[0012] Additional features and advantages of the invention will be
set forth in the description which follows, and in part will be
apparent from the description, or may be learned by practice of the
invention. The objectives and other advantages of the invention
will be realized and attained by the shoes and shoe systems
particularly pointed out in the written description and claims, as
well as the appended drawings.
[0013] To achieve these and other advantages and in accordance with
the purpose of the invention, as embodied and broadly described
herein, the shoe includes an upper having a heel region, a rear
sole secured below the heel region of the upper, and a rear sole
support attached to the upper and configured to secure the rear
sole below the heel region of the upper. The rear sole support
includes a flexible region positioned below the heel region of the
upper and above a portion of the rear sole. The flexible region is
sufficiently stiff to support a user while still being sufficiently
flexible to flex and spring when the user runs or walks vigorously.
The flexible region has an interior portion which in its normal,
unflexed state is spaced upwardly from the portion of the rear sole
immediately below said interior portion, the interior portion being
adapted to flex in a direction substantially perpendicular to the
major longitudinal axis of the shoe as it is used.
[0014] The interior portion of the flexible region preferably is
elevated relative to its peripheral portion in a direction toward
the heel region of the upper. In certain embodiments the flexible
region is an integral part of the rear sole support. The rear sole
support may include an integral arch extension extending below the
upper from a position proximate the heel region of the upper
through a substantial portion of the arch region of the upper to
support the arch region.
[0015] It is to be understood that both the foregoing general
description and the following detailed description are exemplary
and explanatory only and are not restrictive of the invention, as
claimed.
[0016] The accompanying drawings, which are incorporated in and
constitute a part of this specification, illustrate several
embodiments of the invention and together with the description,
serve to explain the principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is an isometric view of an embodiment of the shoe of
the present invention.
[0018] FIG. 2 is an exploded isometric view of a rear sole support,
flexible member, and rear sole for the shoe of FIG. 1.
[0019] FIG. 3 is an exploded isometric view of another embodiment
of a rear sole support, flexible member, and rear sole for use in
the shoe of the present invention.
[0020] FIGS. 4-18 are isometric views of exemplary flexible member
embodiments for use in the shoe of the present invention.
[0021] FIG. 19 is an isometric view of another embodiment of a rear
sole support for use in the shoe of the present invention.
[0022] FIG. 20 is an isometric view of another embodiment of the
shoe of the present invention.
[0023] FIGS. 21 and 22 are isometric views of a rear sole support
for the shoe of FIG. 20.
[0024] FIG. 23 is an isometric view of another embodiment of the
shoe of the present invention.
[0025] FIG. 24 is an isometric view of a rear sole support for the
shoe of FIG. 23.
[0026] FIG. 25 is a side elevation view of a securing member for
use in the shoe of the present invention.
[0027] FIG. 26 is a partial cut-away isometric view of the securing
member of FIG. 25.
[0028] FIG. 27 is an exploded isometric view of an embodiment of
the shoe of the present invention.
[0029] FIG. 28 is an isometric view of another embodiment of the
shoe of the present invention.
[0030] FIG. 29 is an exploded isometric view of a heel support and
rear sole for the shoe of FIG. 28.
[0031] FIG. 30 is another exploded isometric view of the heel
support and rear sole of FIG. 29.
[0032] FIG. 31 is a side elevation view of the rear sole of FIG.
30.
[0033] FIG. 32 is a side elevation view of another rear sole that
can be used in the embodiment shown in FIG. 30.
[0034] FIG. 33 is an exploded isometric view of a heel support,
graphite insert, and rear sole for use in the shoe of the present
invention.
[0035] FIG. 34 is an exploded isometric view of another embodiment
of a heel support, graphite insert, and rear sole for use in the
shoe of the present invention.
[0036] FIGS. 35-37 are views of a rear sole for use in the shoe of
the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0037] Reference will now be made in detail to the present
preferred embodiments of the invention, examples of which are
illustrated in the accompanying drawings. Wherever possible, the
same reference characters will be used throughout the drawings to
refer to the same or like parts.
[0038] FIG. 1 illustrates a first embodiment of the shoe of the
present invention. The shoe, designated generally as 100, has a
shoe upper 120, rear sole support 140, a rear sole 150, and a
forward sole 160. Shoe 100 also preferably includes a flexible
member 200 (FIG. 2) positioned between rear sole 150 and a heel
region of upper 120. The flexible member provides spring to the
user's gait cycle upon heel strike and reduces or eliminates
interior rear midsole compression in that it is more durable than
conventional midsole material.
[0039] Upper 120 may be composed of a soft, pliable material that
covers the top and sides of the user's foot during use. Leather,
nylon, and other synthetics are examples of the various types of
materials known in the art for shoe uppers. The particular
construction of the upper is not critical to the shoe of the
present invention. It may even be constructed as a sandal or may be
made of molded plastic, integral with the rear sole support, as in
the case of ski boots or roller blade uppers.
[0040] Forward sole 160 is attached to upper 120 in a conventional
manner, typically by injection molding, stitching, or gluing.
Forward sole 160 typically includes two layers: an elastomeric
midsole laminated to an abrasion-resistant outsole. The particular
construction of the forward sole is not critical to the invention
and various configurations may be used. For example, the midsole
may be composed of material such as polyurethane or ethylene vinyl
acetate (EVA) and may include air bladders or gel-filled tubes
encased therein, and the outsole may be composed of, by means of
example only, an abrasion-resistant rubber compound.
[0041] Rear sole support 140 is also attached to the heel region of
upper 120 in a conventional manner, such as injection molding,
stitching, or gluing. Rear sole support 140 is substantially rigid
and is configured to stabilize the heel region of upper 120 and
secure rear sole 150 below the heel region. As shown in FIG. 2,
rear sole support 140 may include an upwardly extending wall 142,
referred to as a heel counter, that surrounds the periphery of the
heel region of upper 120 to provide lateral stabilization. Wall 142
preferably surrounds the rear and sides of upper 120 proximate the
heel region and in service supports and stabilizes the user's heel
as he or she runs. Rear sole support 140 also includes a downwardly
extending side wall 144 that defines a recess 146 sized to receive
a portion of rear sole 150, preferably a rear sole which is
removable and rotatable to several predetermined positions. Wall
144 shown in FIG. 2 is generally circular and securely contains and
holds rear sole 150. A plurality of openings 145 is formed in wall
144 to facilitate securement of rear sole 150 to rear sole support
140. The components of rear sole support 140 are preferably made
integral through injection molding or other conventional techniques
and are preferably composed of plastic, such as a durable plastic
manufactured under the name PEBAX. It is further contemplated that
the rear sole support can be made from a variety of materials,
including without limitation other injection-molded thermoplastic
engineering resins.
[0042] As shown in FIGS. 1 and 2, rear sole support 140 may include
an arch extension or support 180 to provide a firm support for the
arch of the foot and to alleviate potential gapping problems where
sole support wall 144 would be adjacent forward sole 160. Arch
extension 180 generally extends below upper 120 from the forward
portion of side wall 144, through the arch region. It may extend as
far as the ball of the foot. It is attached to upper 120 and
forward sole 160 by gluing or other conventional methods. Arch
extension 180 may be composed of the same material as the rear sole
support and made integral with rear sole support 140 by injection
molding. Alternatively, it may be made of the same or a different
stiff but flexible material (such as carbon or fiberglass ribbons
in a resin binder) and glued to rear sole support 140. Such
one-piece construction of the arch extension together with the rear
sole support solves another major problem, namely the tendency of
an athletic shoe of conventional resilient material in the arch
area to curl at the juncture of the substantially rigid rear sole
support with the resilient forward sole.
[0043] Shoe 100 also includes a rear sole 150 that is detachably
secured to and/or rotatably positionable relative to rear sole
support 140. Rear sole 150, as shown in FIG. 1, includes a rubber
ground-engaging outsole 154 containing a planar area and three
beveled segments or portions that soften heel strike during use. As
shown, the beveled segments or portions formed on the outsole have
the same shape and configuration and are positioned symmetrically
about the periphery of the outside and preferably symmetrically
positioned about the center of rear sole 150. As explained in more
detail, rear sole 150 and the attachment features that permit rear
sole 150 to be placed and locked into different positions relative
to rear sole support 140 are designed and configured so that one
symmetrically located beveled portion can be moved into the
position previously occupied by another beveled portion. As a
result, as one of the beveled portions begins to wear, rear sole
150 can be repositioned to place an unworn beveled portion in the
area of the shoe where there is greater wear for a particular user.
By periodically altering the position of the sole before any
beveled portion is badly worn, (or any midsole material directly
above the bevel is badly compressed) the life and effectiveness of
the rear sole, and the entire shoe, can be significantly increased.
Moreover, after a given rear sole wears beyond its point of
usefulness, it can be replaced with a new sole with the same or
different characteristics. Prior to replacement, it is also
possible that left and right rear soles may be exchanged with each
other inasmuch as left and right rear soles often exhibit opposite
wear patterns.
[0044] As shown in FIG. 2, rear sole 150 also includes a midsole
158 laminated to outsole 154. Midsole 158 includes a substantially
cylindrical lower portion 162 and a substantially cylindrical upper
portion 164 that is smaller in diameter than lower portion 162.
Upper portion 164 includes a plurality of resilient knobs 165 that
mate with openings 145 in rear sole support 140. As shown, the
resilient knobs 165 and openings 145 are symmetrically positioned
about the central axis of midsole 158 and the recess of rear sole
support 140, respectively. To secure rear sole 150 to rear sole
support 140, rear sole 150 is simply press-fitted into recess 146
until knobs 165 engage corresponding openings 145. This manner of
locking rear sole 150 into the shoe at any one of several positions
is one of several mechanical ways in which the rear sole can be
removed, repositioned, and/or locked to the rear sole support or
other part of a shoe.
[0045] In the embodiment shown in FIG. 2, upper midsole portion 164
has a diameter at least equal to and preferably slightly larger
than that of the recess into which it fits. Midsole portion 162 has
a diameter substantially equal to the diameter defined by the
exterior portion of circular wall 144. This configuration of
elements eliminates any vertical gapping problems from occurring
between the wall of the rear sole support and the peripheral
surface of the rear sole.
[0046] The inside diameter of a circular recess 146, as measured
between the inside surfaces of its sidewalls, or the distance
between the inside surface of a medial sidewall and the inside
surface of an opposite lateral sidewall in the case of a
non-circular recess (not shown), may actually be greater than the
width of the heel region of the shoe upper as measured from the
exterior surface of the medial side of the heel region of the upper
to the exterior surface of the lateral side of the heel region of
the upper (i.e., the heel region of the upper at its widest point).
This is possible because the material used to make the rear sole
support 140 and side walls is sufficiently strong and durable to
permit the side walls to "flare out" to a greater width than the
heel region of the upper without risk of breakage. This in turn
permits the use of a larger rear sole 150 with more ground-engaging
surface and, hence, more stability. (As stated, the exterior walls
of the lower portion of the rear sole generally align vertically
with the exterior surface of the side walls forming the recess
146). It also permits the employment of a flexible region or member
with a correspondingly larger diameter, width or length because its
peripheral edges optimally should align vertically with the
load-bearing side walls of the recess. Such a larger flexible
region or member, with a diameter, width or length greater than the
width of the heel region of the upper at its widest point, creates
more cushioning and/or spring for the user's heel during the gait
cycle. The observations and provisions contained in this paragraph
are equally applicable to the embodiments described in FIGS. 1, 2,
and 3.
[0047] Rear sole 150 is preferably made from two different
materials: an abrasion-resistant rubber compound for
ground-engaging outsole 154; and a softer, more elastomeric
material such as polyurethane or ethylene vinyl acetate (EVA) for
midsole 158. However, rear sole 150 could be comprised of a single
homogenous material, or two materials (e.g., EVA enveloped by hard
rubber), as well as a material comprising air encapsulating tubes,
for example, disclosed in U.S. Pat. No. 5,005,300. For each of the
discussed rear sole embodiments, the outsole and midsole materials
are preferably more resilient than materials used for the rear sole
support or arch extension.
[0048] Detachability of rear sole 150 allows the user to change
rear soles entirely when either the sole is worn to a significant
degree or the user desires a different sole for desired performance
characteristics for specific athletic endeavors or playing
surfaces. The user can rotate the rear sole to relocate a worn
section to a less critical area of the sole, and eventually replace
the rear sole altogether when the sole is excessively worn. By
periodically changing the position of the rear sole, more uniform
wear and long life (both outsole and midsole) can be achieved.
Additional longevity in wear may also be achieved by interchanging
removable rear soles as between the right and left shoes, which
typically exhibit opposite wear patterns.
[0049] In addition, some users will prefer to change the rear soles
not because of adverse wear patterns, but because of a desire for
different performance characteristics or playing surfaces. For
example, it is contemplated that a person using this invention in a
shoe marketed as a "cross-trainer" may desire one type of rear sole
for one sport, such as basketball, and another type of rear sole
for another, such as running. A basketball player might require a
harder and firmer rear sole for stability where quick, lateral
movement is essential, whereas a runner or jogger might tend to
favor increased shock absorption features achievable from a softer,
more cushioned heel. Similarly, a jogger planning a run outside on
rough asphalt or cement might prefer a more resilient rear sole
than the type that would be suitable to run on an already resilient
indoor wooden track. Rear sole performance may also depend on the
weight of the user or the amount or type of cushioning desired.
[0050] The present invention includes a shoe or shoe kit which
includes or can accept a plurality of rear soles 150 having
different characteristics and/or surface configurations, thereby
providing a cross trainer shoe. As explained in more detail below,
the shoe can also be designed to accept and use different flexible
members in the rear sole area, to achieve optimal flex and
cushioning, through the combination of a flexible member and rear
sole selected to provide the most desirable flex, cushion, wear,
support, and traction for a given application. In a preferred
embodiment, both the rear sole and the flexible member are
replaceable and a given rear sole can be locked in a plurality of
separate positions relative to the recess in which it is held.
[0051] Since rear sole 150 shown in FIGS. 1 and 2 is selectively
positionable relative to rear sole support 140 in a single plane
about an axis perpendicular to the major longitudinal axis of the
shoe, it may be moved to a plurality of positions with a means
provided to allow the user to secure the rear sole at each desired
position. After a period of use, outsole 154 will exhibit a wear
pattern at the point in which the heel first contacts the ground,
when the user is running, for example. Excessive wear normally
occurs at this point, and at midsole 158 generally above this
point, degrading the performance of the rear sole. When the user
determines that the wear in this area is significant, the user can
rotate the rear sole so that the worn portion will no longer be in
the location of the user's first heel strike. For the shoe shown in
FIGS. 1 and 2, rotation is accomplished by detaching the rear sole
and reattaching at the desired location. For the embodiment in FIG.
3 discussed below, the rear sole may be rotated without separating
it from the rear sole support. The number of positions into which
rear sole of FIGS. 1 and 2 can be rotated is limited by the number
of knobs/openings, but is unlimited for the rear sole shown in FIG.
3. The use of other mechanical locking systems to allow selective
movement and locking of the rear sole is contemplated within the
spirit of the invention.
[0052] Rotating the rear sole about an axis normal to the shoe's
major axis to a position, for example, 180 degrees beyond its
starting point, will locate the worn portion of the rear sole at or
near the instep portion of the shoe. The instep portion is an area
of less importance for tractioning, stability, cushioning and shock
absorbing purposes. As long as the worn portion of the rear sole is
rotated beyond the area of the initial heel strike, prolonged use
of the rear sole is possible. The user can continue periodically to
rotate the rear sole so that an unworn portion of the rear sole is
located in the area of the first heel strike.
[0053] The shape of rear sole can be circular, polygonal,
elliptical, "sand-dollar," elongated "sand-dollar," or otherwise.
The shape of recess 146 is formed to be compatible with the shape
of the rear sole. In all embodiments, the invention includes
mechanical means for selectively locking the rear sole relative to
the rear sole support and upper of the shoe. Preferably, the rear
sole is shaped so that at least the rear edge of the outsole has a
substantially identical profile at several, or preferably each
rotated position. To allow for a plurality of rotatable positions,
the shape of the outsole preferably should be symmetrical about its
central axis. As shown in FIG. 1, the rear sole has three beveled
portions which are symmetrically positioned about its central axis.
The user in this embodiment can rotate the rear sole 120.degree.
and place an unworn beveled portion at the rear heel region of the
shoe, where wear is often maximum. Alternatively, the rear sole
could have two beveled portions, 180.degree. apart (in an oval
embodiment this would have to be the case), in which event only one
rotation per shoe, plus an exchange between right and left rear
soles, would be possible, before replacement of rear soles would be
necessary.
[0054] While the above discussion is directed towards a rear sole
that rotates or separates in its entirety, it is specifically
contemplated that the same benefits of this invention can be
achieved if only a portion of the rear sole is rotatable or
removable. For example, a portion of the rear sole, e.g., the
center area, may remain stationary while the periphery of the
ground-engaging surface or outsole rotates and/or is detachable. As
another example, the rear sole may not be removable but only
rotatably positionable.
[0055] In a preferred embodiment of the invention, the shoe of the
present invention includes a flexible region 200 that is positioned
above the rear sole and has a central portion that in its normal
unflexed state is spaced upwardly from the portion of the shoe
(rear sole support, or rear sole) immediately below it. The
flexible region 200 is designed to provide a preselected degree of
flex, cushioning, and spring, to thereby reduce or eliminate
heel-center midsole compression found in conventional materials.
Flexible region 200 is made of stiff, but flexible, material.
Examples of materials that may be used in the manufacture of
flexible member 200 include the following: graphite; fiberglass;
graphite (carbon) fibers set in a resin (i.e. acrylic resin)
binder; fiberglass fibers set in a resin (i.e. acrylic resin)
binder; a combination of graphite (carbon) fibers and fiberglass
fibers set in a resin (i.e. acrylic resin) binder; nylon;
glass-filled nylon; epoxy; polypropylene; polyethylene;
acrylonitrile butadiene styrene (ABS); other types of
injection-molded thermoplastic engineering resins; spring steel;
and stainless spring steel. The flexible region 200 can be
incorporated into other elements of the shoe or can be a separate
flexible member or plate.
[0056] As shown in FIG. 2, flexible member 200 can be in the form
of a plate supported at its peripheral region by an upward facing
top surface of rear sole support 140. In this embodiment, the
member or plate 200 is positioned between the rear sole 150 and the
heel portion of upper 120. A ledge 148 may be formed in rear sole
support 140 to support and laterally stabilize flexible member
200.
[0057] The flexible member may also be permanently attached to the
top or bottom of the rear sole support or detachably secured to the
shoe upper and removable through a pocket formed in the material
(not shown) typically located on the bottom surface of the upper,
or it can be exposed and removed after removing the sock liner or
after lifting the rear portion of the sock liner. Alternatively, it
may be totally exposed as in the case of flexible member 200 shown
in FIG. 18, wherein the U-shaped cushioning member may have direct
contact with the user's heel without an intervening sock liner in
the heel portion of the shoe. The removability of the flexible
member allows the use of several different types of flexible
members of varying stiffness or composition and, therefore, can be
adapted according to the weight of the runner, the ability of the
runner, the type of exercise involved, or the amount of cushioning
and/or spring desired in the heel of the shoe.
[0058] Rear sole 150 may have a concave top surface 167, as shown
in FIG. 2. Therefore, when the rear sole is attached to the rear
sole support, the top surface of the rear sole does not come into
contact with the flexible member when the flexible member deflects
within its designed range of flex. As a result, the middle of the
flexible member can flex under the weight of the user without being
impeded by rear sole 150. Flexible member 200 thus acts like a
trampoline to provide extra spring in the user's gait in addition
to minimizing, or preventing, midsole compression in the central
portion of the rear sole.
[0059] A second preferred embodiment is shown in FIG. 3. In this
embodiment, a rear sole 250 is identical to rear sole 150 shown in
FIG. 2 except that it has a groove 254 below upper midsole portion
252, instead of knobs 165. A rear sole support 240 includes a
downwardly extending wall 244 that has a serrated bottom edge 246
and a threaded inner surface 248. Rear sole support 240 also
includes an upper rim 249.
[0060] The embodiment of FIG. 3 also indicates a threaded ring 400.
Ring 400 includes a threaded outer surface 410 that mates with
threaded inner surface 248 of rear sole support 240. The ring also
includes an outwardly and inwardly extending flange 412 that
presses against serrated bottom edge 246 when the ring is screwed
into the rear sole support. The bottom surface of flange 412
includes anchors 414, and may also be serrated to further grip the
rear sole to prevent rotation. The ring also has two ends 416 and
418, and end 416 may have a male member and end 418 may be shaped
to receive the male member to lock the two ends together. Ring 400
may be made of hard plastic or other substantially rigid materials
that provide a secure engagement with rear sole support 240 and a
firm foundation for supporting flexible member 200.
[0061] Rear sole 250 is attached to rear sole support 240 by
unlocking the ends of ring 400 and positioning ring 400 around
upper midsole portion 252 of the rear sole such that flange 412
engages groove 254. Ring 400 is then firmly locked onto the rear
sole by mating end 416 with end 418. Flexible member 200 is
inserted into the rear sole support so that it presses against
upper rim 249. Ring 400, with rear sole 250 attached, is then
screwed into the rear sole support by engaging threaded surface 410
of the ring with threaded surface 248 of wall 244. The ring is then
screwed into the rear sole support until serrated edge 246 of wall
244 engages flange 412 of ring 400. Serrated edge 246 serves to
prevent rotation of the ring during use and the top edge of ring
400 firmly supports flexible member 200.
[0062] The rear sole support sidewalls need not be continuous
around the entire recess. Such sidewalls may be substantially
eliminated on the lateral and medial sides of the rear sole
support, or even at the rear and/or front of the rear sole support,
exposing ring 400 when installed, even allowing it to protrude
through the sidewalls where the openings are created. This has no
effect whatsoever on the thread alignment on the inside surface of
the remaining sidewalls. The advantage of doing this is that a ring
with a slightly larger diameter than otherwise possible and, hence,
a flexible member with a slightly larger diameter than otherwise
possible may be employed.
[0063] In the embodiment shown in FIG. 3, a variety of different
flexible members 200 having different flex and cushioning
characteristics can be selectively incorporated into the shoe.
Flexible member 200, once incorporated into the shoe, is securely
held in place with rear sole support 240. Preferably, the rear sole
support contacts flexible member 200 only along its outer
periphery, and rear sole support 240 includes an opening above the
flexible member, thereby permitting the plate to protrude upwardly
toward the user's heel. Moreover, because the top surface of rear
sole 250 is preferably concave in shape, the central portion of the
rear sole does not contact the central portion of the flexible
member in its unflexed, normal position. As a result, the flexible
member can also flex downward. The degree of flexing of the member
can be controlled both by the selection of the material and shape
of the member, as well as the relative dimensions and shape of rear
sole support 240 and rear sole 250. While flexible member 200 and
the corresponding recess in rear sole support 240 are circular in
FIG. 3, other shapes can be utilized. Rear sole support 240 could
be designed to include a recess above upper rim 249 to accept the
flexible member and a mechanical means, such as a circular locking
ring, similar to ring 400, to support and lock the flexible member
in place. In such an embodiment, the user could change the flexible
member from the inside of the shoe. Similarly, the flexible member
200 could be fixedly secured to, or incorporated as an integral
part, of either the rear sole support or the rear sole. Similar
configurations of an integral flexible region are within the spirit
of the invention.
[0064] The embodiment of FIG. 3 and other embodiments of the
invention preferably provide a shoe that includes a flexible region
or member which has its own preselected spring and cushioning
characteristic and which is preferably removable and replaceable, a
rear sole with its own pre-selected cushioning properties (both
outsole and midsole) and which is preferably removable,
replaceable, and capable of being locked in place at a plurality of
preselected positions; a plurality of beveled portions on the outer
surface of the rear sole which are preferably symmetrically located
about its axis; and an interrelationship of the flexible member,
rear sole support, and rear sole which permit the flexible member
to freely flex to at least a predetermined degree. The flexible
region and its characteristics, the rear sole and its
characteristics, and the rear sole's relative location to the
flexible region can be selectively altered, to provide in
combination an optimal shoe for a given application. Also, because
of the rear sole rotation and replacement permitted by the
invention, typically heavy outsole material may be made thinner
than on conventional athletic shoes, thus reducing the weight of
the shoe. The invention also permits the weight of the shoe to be
further reduced because the central portion of the midsole of the
rear sole can be eliminated, since the flexible region of the shoe
provides weight bearing and cushioning at this area.
[0065] Other rear sole support/rear sole combinations for securing
the rear sole to the shoe and for supporting the flexible member at
or below the heel region of the upper are contemplated and fall
within the spirit of this invention, as described and claimed. By
means of example only, some such additional configurations are
disclosed in commonly-owned U.S. patent application Ser. No.
08/291,945, now U.S. Pat. No. 5,560,126, which is incorporated
herein by reference.
[0066] The flexible region of the present invention is not limited
to a circular shape and can be adapted to conform to the shape of
the rear sole. The flexible region also need not be used only in
conjunction with a detachable rear sole, but can be used with
permanently attached rear soles as well.
[0067] FIGS. 4-17 show various alternative embodiments of the
flexible member. In each of these embodiments, the flexible member
may be curved or convex in shape, or have an inwardly curved or
concave bottom surface, such that the interior portion of the
flexible member is elevated relative to its periphery when the
flexible member is positioned in the shoe in its normal position.
Each of the following flexible member embodiments may be used in
conjunction with the rear sole support/rear sole combinations
disclosed in FIGS. 1-3 and more generally disclosed in this
disclosure in its entirety. In addition, the following disclosed
embodiments of flexible members can be integrally incorporated into
a portion of the shoe. In either event, the resultant shoe has a
flexible region which provides a preselected flex and spring.
[0068] As shown in FIG. 4, flexible member 500 has a concave under
surface 502 (when viewed from its bottom) and an opposing convex
upper surface, and is circular in shape. As a result, the interior
portion of the flexible member 500 is elevated relative to its
peripheral portion and is positioned above a portion of the rear
sole of the user when supported in the shoe.
[0069] Flexible members 510 and 520 shown in FIGS. 5 and 6,
respectively, are similar in structure to flexible member 500
except that flexible member 510 has a bottom surface 514 and a
moon-shaped notch 512 and flexible member 520 has a bottom surface
524 and two opposing moon-shaped notches 522. Notch 512 of flexible
member 510 is preferably aligned with the back of the rear sole.
One of notches 522 of flexible member 520 may be aligned with the
back of the rear sole, or alternatively such notches may be aligned
with the lateral and medial sides of the shoe. Flexible member 530
as shown in FIG. 7 is identical in structure to flexible member 520
shown in FIG. 6 except that it is not spherically convex in shape,
but rather convexly curved in only one direction. The flexible
member 530 alignment options are the same as those of flexible
member 520.
[0070] As shown in FIG. 8, flexible member 540 includes a plurality
of spokes 542 each joined at one end to a hub 544 and joined at an
opposite end to rim 546. The size, shape, and number of spokes is
variable depending on the desired flexibility. As shown in FIG. 8,
each of spokes 542 has a triangular cross-section, although the
cross-section may also be square, rectangular, or any other
geometrical shape. When positioned in the shoe, hub 544 is elevated
relative to rim 546 such that hub 544 is closer to the heel region
of the upper.
[0071] The flexible members shown in FIGS. 9-12 are variations of
flexible member 540 shown in FIG. 8. Flexible member 550 shown in
FIG. 9 is identical in structure to flexible member 540, but
includes webbing 552 covering the top surface of flexible member
550 and joining each of spokes 542 to reinforce flexible member
550. Webbing 552 may be injection molded with the rest of flexible
member. Flexible member 560 shown in FIG. 10 is similar in
structure to flexible member 540 shown in FIG. 8; however, spokes
562 decrease in thickness between hub 564 and the central portion
of each of the spokes 562 and then increase in thickness from the
central portion toward rim 566.
[0072] Flexible member 570, shown in FIG. 11, also includes a
plurality of spokes 572 joined at opposite ends to hub 574 and rim
576. In this embodiment, the thickness of the spokes decreases in a
direction from hub 574 toward rim 576. As shown in FIG. 11, the
decreasing thickness of spokes 572 results in at least a portion of
the interior portion of flexible member 570 in the area of the
decreasing thickness spokes 572 being thinner than at least a
portion of its peripheral edges or rim 576. Hub 574 and other
portions of the center portion of the interior portion of flexible
member 570 are shown as being thicker than another portion of the
interior portion of flexible member 570, such as in the area of
decreased spoke thickness. As shown in FIG. 11, center portion or
hub 574 and peripheral edge or rim 576 may both be thicker than a
portion of the interior portion of flexible member 570 between hub
574 and rim 576. In addition, webbing 578 may be placed over the
top surface of flexible member 570 similar to that disclosed in
FIG. 9. As shown in FIG. 11, spokes 572 are preferably oriented
such that each spoke is oriented 180 degrees from an opposite spoke
to provide a rib that extends substantially across flexible member
570. Whether referred to as opposite spokes 572 or a rib the
thickness may be varied. The rib is preferable integrally formed
with flexible member 570 and more preferably is on the bottom
surface or concave surface of flexible member 570. As can be seen
in FIG. 11, a hole may be provided through flexible member 570 and
more particularly, through the center or hub 574. As can be further
determined from FIG. 11, flexible member 570 may be substantially
planar in shape, but is not conical in shape.
[0073] FIG. 12 illustrates a housing 580 for supporting the
flexible member, in this example, flexible member 560. Housing 580
has an L-shaped cross-section to support the bottom and side
surfaces of rim 566. Housing 580 may be inserted into the shoe heel
with flexible member 560 or may be permanently affixed to the rear
sole support. In either case, housing 580 acts as a reinforcement
for limiting or eliminating lateral movement of flexible member 560
during use. This may have the effect of making the center of the
flexible member more springy. It may also allow the member to be
made of thinner and/or lighter weight material.
[0074] FIGS. 13 and 14 show further variations of flexible plate
500 shown in FIG. 4. While flexible plate 500 has a generally
uniform thickness at any given radius, flexible plate 585 shown in
FIG. 13 decreases in thickness from the center of the member toward
its periphery. Flexible member 590 shown in FIG. 14, on the other
hand, is thicker near the center and at the periphery, but thinner
therebetween.
[0075] FIGS. 15-17A disclose flexible members composed of carbon
ribbons set in a resin binder. Alternatively, they may be
fiberglass ribbons or a combination of carbon and fiberglass
ribbons. Ribbons made of other types of fiber may also be used.
Flexible member 600 includes radially or diametrically projecting
ribbons 602, either emanating from the center of flexible member
toward its periphery or, preferably, passing through the center
from a point on the periphery to a diametrically opposite point on
the periphery. These ribbons 602 are fixed in position by a resin
binder 604 known in the art. Flexible member 610 shown in FIG. 16
also includes carbon ribbons 602 set in a resin binder 604, but
further includes a rim 606 comprised of ribbon preset in the resin
binder and defining the periphery of flexible member 610. Flexible
member 620 shown in FIG. 17 is identical to flexible member 610
shown in FIG. 16 except that it further includes a circular ribbon
608 disposed in resin binder 604 and circumscribing the center of
flexible member 620. The flexible member shown in FIG. 17A is
identical to the flexible member 610 shown in FIG. 17 except that
it has fewer spokes and further includes a plurality of circular
ribbons 608 spaced radially from the center of the member and
disposed in the resin binder 604. Flexible members 600, 610, and
620 may be convex in shape so that the center of the flexible
member is raised relative to its outer perimeter, when placed in
the shoe. They may also have a U-shaped cushioning member placed on
or secured to their top surface like that shown in FIG. 18.
[0076] Since it is contemplated that the flexible member will be
composed of graphite or other stiff, but flexible, material, it is
preferable to cushion the impact of the user's heel against the
flexible member during use. As shown in FIG. 18, a substantially
U-shaped cushioning member 650 is disposed on the top surface of
flexible member 500 to cushion the heel upon impact. The U-shaped
cushioning member is shaped to generally conform to the shape of
the user's heel. Thus, the open end of the U-shape is oriented
toward the front of the shoe. Cushioning member 650 may be composed
of polyurethane or EVA or may be an air-filled or gel-filled
member. Cushioning member 650 can be affixed to flexible member 500
by gluing, or may be made integral with flexible member 500 in an
injection molding process. If injection molded, cushioning member
650 would be made of the same material as flexible member 500. To
decrease the stiffness of cushioning member 650 in this instance,
small holes (not shown) may be drilled in cushioning member 650 to
weaken it and thereby allow it to depress more readily upon impact
and more uniformly with flexible member 500.
[0077] The cushioning member 650 described above can be
incorporated into a shoe having any of the various flexible regions
disclosed in this application and drawings, as well as other shoes
falling within the scope of the claims.
[0078] If cushioning member 650 is used, the shoe sock liner, which
generally provides cushioning, may be thinner in the heel area or
may terminate at the forward edge of cushioning member 650. If
cushioning member 650 is not used, the sock liner may extend to the
rear of the shoe and may be shaped to conform to the user's heel on
its top surface and the flexible member on its bottom surface. Its
bottom surface may also compensate for gaps formed by the flexible
member. For example, the sock liner may have a concave bottom
surface in the heel area to correspond to those flexible members
having convex upper surfaces.
[0079] In each of the above-described embodiments, the flexible
member is illustrated as a separate component of the shoe which can
be removed from the shoe and replaced by a similar or different
flexible member, as desired. In each of the embodiments the central
portion of the flexible member is raised relative to its outer
perimeter so that when placed in the shoe, the interior portion in
its normal state does not touch the rear sole support and/or rear
sole. As a result, the interior of the flexible member will flex in
response to the user's stride without first, if ever, contacting
the rear sole support and/or rear sole. Such flexible member,
therefore, can be used with rear soles that have a flat upper
surface, as well as those that have a concave upper surface. The
relative shape and positioning of the flexible member and the
adjacent rear sole support or rear sole can be designed to provide
the optimum flex, stiffness, and spring characteristics. However,
each of the above-described flexible members may be made integral
with the rear sole support, which not only decreases the number of
loose parts and increases the efficiency of the manufacturing
process, but also further limits the lateral displacement of the
periphery of the flexible member upon deflection, potentially
creating more spring in the center and/or permitting the use of
thinner and/or lighter weight material.
[0080] As shown in FIG. 19, rear sole support 340 is identical in
structure to rear sole support 140 shown in FIG. 2 except that rear
sole support 340 has a flexible region 700 that serves the same
purpose and function as any of the above-described flexible
members. In fact, any of the above-described flexible members may
be used as flexible region 700 so long as they can be made integral
with rear sole support 340. In this example, flexible region 700 is
convex in shape and thus similar to flexible member 500 shown in
FIG. 4. Cushioning member 650 or a modified sock liner as described
above may also be used.
[0081] The flexible region may be incorporated into other rear sole
support embodiments as well. As an alternative to using arch
extension 180, rear sole support 440 shown in FIGS. 20-22 includes
a thickened tongue 447 that extends toward the ball of the foot.
Thickened tongue 447 provides additional gluing surface for
attaching the rear sole support to forward sole 160 and additional
stiffness to the heel portion of the shoe and the arch area, thus
minimizing the chances of separation of the forward sole from the
rear sole support, and at the same time minimizing the tendency of
the shoe to curl at the juncture of the hard rear sole support with
the soft forward sole. Similar to rear sole support 240, rear sole
support 440 includes a heel counter 442 and a side wall 444. Rear
sole support 440 also includes a rim 448 and anchors 452 to receive
and retain a rear sole with a mating groove, such as rear sole 250.
Forward sole 260 is longer in this embodiment to extend back to the
edge where it would abut the rear sole. Flexible region 710 is
identical to flexible region 700 in FIG. 19.
[0082] In another embodiment, rear sole support 460, as shown in
FIGS. 23 and 24, includes a tongue 462 that is thinner and slightly
smaller than tongue 447 shown in FIGS. 20-22. However, rear sole
support 460 includes a curved wall 464 that has a pocket formed on
its forward side for receiving a mating rear edge of forward sole
360 adjacent the rear sole support. Curved wall 464 provides a
firm, smoothly contoured transition from hard-to-align resilient
materials of the forward and rear soles and thereby minimizes
gapping. It also provides a desirable brace or bumper for the lower
portion of the rear sole when the user is running. Flexible region
720 is identical to flexible regions 700 and 710.
[0083] As shown in FIGS. 25 and 26, the flexible member may also be
integrated with the securing member. Securing member 750 is similar
in structure and function as securing member 400 in that it
includes a wall 752 with a threaded outer surface, an inwardly and
outwardly extending rim 754, and anchors 756. Securing member 750
also includes a convex flexible region 760 integral with wall 752.
Flexible region 760, like flexible regions 700 and 710, may
incorporate any of the configurations shown in FIGS. 4-18.
[0084] Securing member 750 is simply substituted for securing
member 400 and flexible member 200 shown in FIG. 3 to attach rear
sole 250 to rear sole support 240. However, since securing member
750 does not include mating ends 416, 418, rear sole 250 is
press-fitted into securing member 70 until rear sole groove 254
mates with securing member rim 754. This may have the effect of
making the center of the flexible member more springy. It may also
allow the flexible member to be made of thinner and/or lighter
weight material.
[0085] FIG. 27 illustrates another embodiment of the shoe of the
present invention. The shoe, designated generally as 820, has a
shoe upper 822, a forward sole 824, a heel support 826, and a rear
sole 828. The forward sole and heel support are attached to the
shoe upper in a conventional manner, typically by injection
molding, stitching or gluing.
[0086] As shown in FIG. 27, the heel support 826 preferably
includes a heel counter 827 for stabilizing a heel portion of the
upper 22 above the heel support and a side wall 838 that extends
downwardly from the upper and defines a recess 840 sized to receive
the rear sole. The heel support may also include a substantially
horizontal top wall 838' for supporting the heel portion of the
upper. Otherwise, the top of the rear sole or an insert, as will be
discussed in more detail later, will support the heel portion of
the upper. The components of the heel support, including heel
counter 827 and the side wall 838, are preferably made integral
through injection molding or other conventional techniques and are
preferably composed of plastic, such as a durable plastic
manufactured under the name PEBAX.
[0087] Another embodiment of the present invention is shown in
FIGS. 28-31. The shoe includes an upper 22, a heel support 940, a
rear sole 950, and a forward sole 960. As shown in FIG. 29, the
heel support 940 includes a heel counter 942, a downwardly
extending wall 944 that defines a recess 946 sized to receive the
rear sole, and a rim 948 formed around the lower portion of the
wall and extending inwardly into the recess. Anchors 952 may be
formed on the bottom surface of the rim 948 and extend downwardly
toward the rear sole 950.
[0088] The rear sole 950 includes a rubber ground-engaging surface
954 containing, in this embodiment, three beveled segments or edges
956. As shown in FIG. 31, the rear sole 950 also includes a midsole
958 laminated to the ground-engaging surface 954 that includes a
substantially cylindrical lower portion 962 and a substantially
cylindrical upper portion 964 that is smaller in diameter than the
lower portion. A groove 966 is formed between these upper and lower
portions and receives the rim 948 of the heel support to retain the
rear sole in the heel support recess.
[0089] The upper midsole portion 964 includes a spiral groove 968,
as shown in FIGS. 29-31, that allows the rear sole to be screwed
into the heel support. As shown in FIG. 29, a portion of the rim of
the heel support is cut away at 970. The rear sole is screwed into
the heel support by aligning the top of the spiral groove with an
edge 972 of the rim adjacent the cut-away portion. A sharp
instrument (such as a slender screwdriver), inserted through the
window 974 and into the top of the spiral groove 968 may aid in the
start-up process. The rear sole is then simply rotated, and the rim
engages the spiral groove of the rear sole to screw the upper
midsole of the rear sole into the recess. Once fully inserted, the
rear sole may be rotated freely within the recess by hand, albeit
with desired resistance. When the rear sole is attached to the heel
support, the optional anchors sink into the lower midsole portion
of the rear sole due to the weight of the user to prevent rotation
of the rear sole during use.
[0090] It should be noted that the configuration of the midsole
958, i.e., the upper midsole portion having a diameter equal to or
slightly larger than that of the recess defined by the rim and a
lower midsole portion having a diameter substantially equal to the
diameter defined by the circular wall 944, further eliminates any
vertical gapping problems from occurring between the wall of the
heel support and the peripheral surface of the rear sole.
[0091] To assist in removing the rear sole from the heel support,
the two windows 974, 976 (FIG. 29) are formed in the wall of the
heel support, a first window 974 above the cut-away portion of the
rim and a second window 976 positioned 180 degrees around the wall
of the heel support from the first window. In addition, a small
indention 978 is formed on the peripheral surface of the upper
midsole portion 964 at a position 180 degrees from the point at
which the spiral groove 968 intersects the bottom of the upper
midsole portion 964, as shown in FIG. 31. To remove the rear sole
from the heel support, the rear sole is rotated in the heel support
until the small indention appears in the second window 976. At this
point, the bottom of the spiral groove is aligned with the center
of the cut-away portion. The user, again using a screwdriver or
similar instrument inserted through the window 974 into the spiral
groove 968, can then simply rotate the rear sole so that the rim of
the heel support engages the spiral groove. The rear sole is then
simply rotated to screw the rear sole out of the heel support.
[0092] It is not necessary to include a spiral groove in the rear
sole for attaching and removing the rear sole from the heel
support. As shown in FIG. 32, a rear sole 950 is similar to that
shown in FIG. 31, but includes no spiral groove and no small
indention. Because the upper portion 964 and lower portion 962 of
the midsole 958 are made of a soft material, it can be press-fitted
into the recess of the heel support until the rim 948 engages the
groove 966.
[0093] As shown in FIGS. 28-30, the shoe of the present invention
also preferably includes an arch bridge 980 attached to, and
integral with, the heel support 940 to provide an even firmer
support for the arch of the foot and for alleviating potential
gapping problems where the wall of the heel support is adjacent the
forward sole. The arch bridge 980 generally extends from the rear
of the recess 946 (where it attaches to the heel counter 942 and
side wall 944) to the ball of the foot and is attached to the upper
22 and forward sole 960 by gluing or other conventional methods.
The arch bridge 980 also is preferably composed of the same
material as the heel support and is made integral with the heel
support 940 by molding. Such one-piece construction of the arch
bridge together with the heel support solves another major problem,
and that is the tendency of an athletic shoe of conventional "full
body" arch construction to curl at the juncture of the hard heel
support with the resilient forward sole.
[0094] Another embodiment for attaching the graphite insert is
shown in FIG. 33. In this embodiment, the graphite insert 1000 is
inserted through the bottom of the heel support 1040 so that the
periphery of the graphite insert presses against the lower surface
of an upper rim 1049 of the heel support. A plastic ring 1010 is
also inserted in the recess between the graphite insert and the rim
1048. Such ring 1010 is flexible enough to allow it to be inserted
into the heel support. The ring supports the periphery of the lower
surface of the graphite insert. The rear sole 1050 is a screw-in
type identical to the rear sole 950 shown in FIG. 31 except that it
has a concave top surface to allow the graphite insert to flex
during use.
[0095] As shown in FIG. 33, the rim 1048 of the heel support
includes two cut-away portions at 1070 and windows 1074, 1076 to
allow the graphite insert and the ring to be inserted into the
recess of the heel support, in addition to allowing the rear sole
to be screwed onto the heel support in the same manner as
contemplated by FIGS. 29, 30 and 31. The ring 1010 also has windows
1012, 1014 that are aligned with the windows 1074, 1076 when the
ring is inserted into the recess.
[0096] Alternatively, the rim 1048 of the heel support and the
graphite insert 1000 can be "gear-shaped", as shown in FIG. 34, to
allow the graphite insert 1000 to be inserted into the heel
support. Again, the ring 1010 is flexible enough to allow it to be
inserted into the heel support.
[0097] If additional cushioning is desired, the rear sole can be
modified as shown in FIGS. 35-37. In this embodiment, a
"doughnut-shaped" void 1152 is created in the middle of a rear sole
1150 to support an air-filled cushion 1170 similar in shape to an
inner tube for a tire. In addition, several voids 1154 are formed
around the periphery of the rear sole to reduce the weight of the
rear sole and better exploit the cushioning properties of the
air-filled cushion 1170 when the shoe strikes the ground during
use. The voids are preferably positioned directly below the knobs
1156 to cushion the force transmitted from the heel support to the
knobs. The air cushion 1170 may include a valve 1172 for inflating
and deflating the cushion.
[0098] It will be apparent to those skilled in the art that various
modifications and variations can be made in the system of the
present invention without departing from the scope or spirit of the
invention. Thus, it is intended that the present invention cover
the modifications and variations of this invention provided they
come within the scope of the claims and their equivalents.
* * * * *