U.S. patent application number 11/490432 was filed with the patent office on 2008-01-24 for dynamic sole.
Invention is credited to Harry F. Hlavac.
Application Number | 20080016724 11/490432 |
Document ID | / |
Family ID | 38970057 |
Filed Date | 2008-01-24 |
United States Patent
Application |
20080016724 |
Kind Code |
A1 |
Hlavac; Harry F. |
January 24, 2008 |
Dynamic sole
Abstract
A sole for use in footwear that includes an upper surface for
contacting the user's foot and a lower surface for engaging a
walking surface. The sole extends beneath the heel through the
ankle/sub-talar complex and metatarsal head of the user. The lower
surface is characterized as having a convex lower surface beneath
the ankle/sub-talar complex curving upwardly toward the heel and
metatarsal head.
Inventors: |
Hlavac; Harry F.; (Larkspur,
CA) |
Correspondence
Address: |
Dergosits & Noah LLP
Four Embarcadero Center, Suite 1450
San Francisco
CA
94111
US
|
Family ID: |
38970057 |
Appl. No.: |
11/490432 |
Filed: |
July 20, 2006 |
Current U.S.
Class: |
36/30R |
Current CPC
Class: |
A43B 13/12 20130101;
A43B 13/145 20130101; A43B 13/122 20130101; A43B 13/125
20130101 |
Class at
Publication: |
36/30.R |
International
Class: |
A43B 13/12 20060101
A43B013/12 |
Claims
1. A sole for use in footwear comprising an upper surface for
contacting the user's foot and a lower surface for engaging a
walking surface, said sole extending beneath the heel through the
ankle/sub-talar complex and metatarsal head of a user, said lower
surface being characterized as having a convex or flat lower
surface beneath the ankle/sub-talar complex curving upwardly toward
said heel and metatarsal heads.
2. The sole of claim 1 wherein said upward curve of said convex
lower surface is tilted at least approximately 20 degrees toward
both said heel and metatarsal head.
3. The sole of claim 1 wherein said upper surface comprises a
cushioning material and an arch to act as a foot cradle to conform
to the four major arches of the foot.
4. The sole of claim 1 wherein said lower surface comprises a
rocker bottom comprising a material capable of retaining its shape
upon multiple uses.
5. The sole of claim 4 wherein said rocker bottom is thicker in its
portion residing beneath the ankle/sub-talar complex than in those
portions residing beneath the heel and metatarsal head.
6. The sole of claim 1 further comprising a midsole positioned
between said upper and lower surfaces.
7. The sole of claim 6 wherein the thickness of said sole is
variable by varying the thickness of said midsole.
8. A sole for use in footwear comprising an upper surface for
engaging a user's foot and a lower surface for engaging a walking
surface, said sole extending from the heel through the
ankle/sub-talar complex and metatarsal head of the user, said lower
surface being characterized as being convex beneath the
ankle/sub-talar complex and being curved upwardly toward the heel
and metatarsal head.
9. The sole of claim 8 wherein said upward curve of said convex
lower surface is tilted at least approximately 20 degrees toward
both said heel and metatarsal head.
10. The sole of claim 8 wherein said upper surface comprises a
cushioning material and an arch to conform to a user's foot.
11. The sole of claim 8 wherein said lower surface comprises a
material capable of retaining its shape upon multiple uses.
12. The sole of claim 8 wherein a skeletal structure is embedded
within or attached to said sole to maintain the shape of said sole
upon multiple uses.
Description
TECHNICAL FIELD
[0001] The present invention involves a sole capable of being
incorporated in a variety of footwear applications including shoes,
sandals and slippers (collectively referred to as "shoes"). When
properly incorporated within a shoe, the present invention provides
motion enhancement for the human foot to improve posture, comfort,
support and to eliminate shock.
BACKGROUND OF THE INVENTION
[0002] Although there have been a plethora of soles and orthotic
inserts alleged to improve the acts of walking, standing,
exercising and load bearing in order to provide decreased stress
and skeletal alignment, there has been no system that can be
characterized as representing a paradigm change in foot function
from resistance to acceleration and from motion control to motion
enhancement. Traditional orthotic devices and shoes employing them
use firm materials to support the foot and cushion materials for
shock absorption that protect the foot from hard surfaces. Comfort
is based on the cushioning or support or a combination depending on
the environment and activities.
[0003] In this regard, reference is made to FIG. 1 which depicts
the typical dynamics of foot and leg motion when taking a step in
pre-existing footwear. As noted, leg 10 supports a foot contained
within shoe 11. As a step is taken, heel 15 begins to engage
surface 14. As this occurs, the longitudinal axis 12 running down
leg 10 is perpendicular to the longitudinal axis 13 of the foot
contained within shoe 11. As the totality of shoe 11 comes into
full contact engagement with support surface 14, the angle between
longitudinal axes 12 and 13 expands approximately 15 degrees. This
expansion is done through the ankle and sub-talar joints. Next,
shoe 11 again being flush with surface 14 supports leg 10 in an
upright fashion returning the angle between axes 12 and 13 to one
which is perpendicular or 90 degrees. As the stepping function
continues, leg 10 then moves forward as one begins to step off from
support surface 14. When this occurs, longitudinal axes 12 and 13
form an acute angle, that is, less than 90 degrees, and, generally,
about 80 degrees. Finally, the step-off motion continues as leg 10
bends at the knee, heel 15 is lifted from surface 14 and push-off
is created through the metatarsal region.
[0004] From a review of the walking motion depicted in FIG. 1,
several things become readily apparent. Initiating walking motion
creates initial heel impact as heel 15 of shoe 11 engages surface
14. Next, the downward ankle motion through the sub-talar joint
creates fatigue. As the step-off motion is initiated, stress is
created through the toe joints, hallux limitus causing bunions,
metatarsalgia, capsulitis and hammertoes. Again, there has been no
suggestion to date as how one would change the walking dynamic
shown in FIG. 1 to alleviate these concerns.
[0005] It is thus an object of the present invention to provide a
new sole for a shoe capable of improving the walking motion
providing the user with attendant benefits heretofore being
unavailable.
[0006] These and further objects will be more readily apparent when
considering the following disclosure and appended claims.
SUMMARY OF THE INVENTION
[0007] A sole for use in footwear comprising a foot cradle for
contacting the user's foot and a rocker bottom for engaging a
walking surface, said sole extending beneath the heel through the
ankle/sub-talar complex and metatarsal head of a user, said rocker
bottom being characterized as having a convex lower surface beneath
the ankle/sub-talar complex curving upwardly towards said heel and
said metatarsal head. The present invention supports the four major
arches of the foot, eliminates step shock, controls frontal plane
motion, transfers motion from the heel to ankle at the sub-talar
joint and ankle to forefoot at the metatarsal joint.
BRIEF DESCRIPTION OF THE FIGURES
[0008] FIG. 1 is a schematic illustration showing the interaction
between the leg and foot of a walker employing a traditional
shoe.
[0009] FIG. 2 is a side view showing the skeletal components of the
human foot as well as the alignment of this foot to the dynamic
sole of the present invention.
[0010] FIG. 3A is a side exploded view of the dynamic sole of the
present invention depicting its various elements.
[0011] FIG. 3B is a side view of what is referred to as the high
rocker version of the present invention.
[0012] FIG. 4 is a schematic depiction of one's walking motion in
comparison to the schematic illustrations of FIG. 1, in this
instance, employing a shoe having the dynamic sole of the present
invention.
[0013] FIG. 5 is a side plan view depicting an embodiment of the
present invention whereby a frame structure is employed to maintain
the intended shape of the dynamic sole.
DETAILED DESCRIPTION OF THE INVENTION
[0014] As noted previously with respect to the discussion of FIG.
1, the typical walking motion in prior footwear on hard flat
surfaces creates impact shock and rapid downward flexion of the
foot as body weight passes from heel to toe through the sub-talar,
ankle, and mid-tarsal joints until the forefoot impacts and pushes
off through the weight bearing metatarsal bones. The most common
heel, ankle, and forefoot problems such as heel spurs, plantar
fasciitis, ankle arthritis, tendonitis, metatarsalgia, capsulitis,
sesamoiditis, bunions, hallux rigidus, and hammertoes are caused by
walking on hard surfaces with a heeled shoe. Of primary concern is
the recognition that prior footwear causes the bones of the foot
and ankle to undergo greater impact and joint distortion than
walking barefoot on soft surfaces.
[0015] The present invention can be more readily appreciated when
considering FIG. 1 in conjunction with the depiction of human foot
30 of FIG. 2. FIG. 2 shows curved shapes I, II, and III known as
"rockers of the foot" (A, B and C are known as "rockers of the
sole"). As background, during the swing phase of walking, the foot
lands in relaxed supination. Just before contact, the foot
dorsiflexes at the ankle to clear the ground. At heel contact
(rocker I), these dynamics change. Actions are reactive to absorb
shock and maintain balance. On contact, the heel hits the outside
of the center with the foot slightly toed out. Immediately
thereafter, the shock of impact is dissipated by pronation of the
foot to adapt it to the support surface and to maintain balance
noting that this contact phase is also known as the resistance
phase. Upon forefoot contact, the resistance phase ends as stress
(center of pressure) passes over rocker II, the ankle/sub-talar
complex. On foot contact, the rebound force through the midfoot
meets the downward force of body weight within the base support as
the center of pressure passes through the metatarsal heads (rocker
III). As pressure passes the metatarsals, if they are stable,
windlass action of the plantar fascia pulls and elevates the heel
as the heel leaves the ground in the lift-off phase.
[0016] These dynamic actions result, as noted above, in heel impact
(rocker I), ankle maladies (rocker II) and stress to toe joints
(rocker III). The present invention comprises sole 21 intended to
extend from heel 32 through ankle/sub-talar complex beneath the
sub-talar joint 31 and metatarsal head 33 ending proximate toes 34.
In order to appreciate the present invention more fully, dynamic
sole 21 is shown in FIG. 2 positioned below foot 30 as foot 30 is
prepared to step onto and be supported by dynamic sole 21. In this
regard, dynamic sole 21 is segmented into subparts A, B, and C.
[0017] Sole 21 includes foot cradle portion 40 which is intended to
contact user's foot 30. Foot cradle portion 40 can consist of a
cushioning material such as commonly used in shoes such as EVA
(ethylene vinyl acetate), polyurethane, rubber, neoprene.TM. and
poron.TM. and can have an arched upper surface 41 to conform to the
arch of a user's foot for added comfort and support. Of paramount
importance in considering the present invention is the shape of
lower surface 45 of rocker bottom 50 shown in FIGS. 2 through
5.
[0018] Rocker bottom 50, as noted in FIG. 2, extends from heel 32
beneath rocker I constituting subsection A thereof. This portion of
rocker bottom 50 transitions into subpart B located beneath
sub-talar joint 31 and ankle joint 35 and, in doing so, lies
beneath rocker II. Subpart B of dynamic sole 50 then transitions
into subsection C located beneath rocker III, or, in other words,
beneath the metatarsal head. Lower surface 45 of rocker bottom 50
provides a convex or flat plane lower surface beneath sub-talar
joint 31 in the area depicted as subpart B. Further, lower surface
45 curves upwardly from subpart B to subparts A and C, the latter
beneath heel portion 32 and metatarsal portion 33 of foot 30, these
curved portions being tilted at least approximately 20 degrees from
subpart B towards the above-referenced heel and metatarsal head
regions indicating as angles theta and theta prime, respectively.
In order to maintain this shape, rocker bottom 50 should comprise
material capable of retaining its shape upon multiple uses.
Suitable material includes etheylene vinyl acetate, for
example.
[0019] To fully appreciate the benefits inherent in the sole of the
present invention, reference is made to FIG. 4. As is the case with
FIG. 1, the stepping motion is depicted schematically, in this
instance showing leg 10 in conjunction with shoe 20 having dynamic
sole 21 of the present invention. As was the case with regard to
FIG. 1, the walking motion begins with the heel of shoe 20
impacting surface 14 noting the perpendicular relationship between
longitudinal axes 12 and 13 of leg 10 and the foot of the user,
respectively. However, unlike the schematic shown in FIG. 1, as the
stepping motion continues, longitudinal axes 12 and 13 remain
perpendicular to one another as the foot of the user contained in
shoe 20 "rocks" through the stepping and walking motion along
dynamic sole 21 from heel impact through toe liftoff. This
represents a paradigm change in foot function from resistance to
acceleration, from motion control to motion enhancement. Dynamic
sole 21 alters heel contact, ankle motion and pressure on the
forefoot, relieving a multitude of postural conditions. Rocker
bottom 50 ideally being at least one-quarter inch thicker in
subpart B (beneath sub-talar joint 31) creates a convex or flat
lower surface and, this in conjunction with the turned-up lower
surfaces in subparts A and B results in decreased heel impact and a
reduction in stress over both the ankle joint and metatarsal
regions of the foot. As such, the present invention's dynamic
rocker sole bottom enhances heel, ankle and metatarsal movement in
the sagittal plane while the foot cradle controls foot motions,
pronation and supination in the frontal plane.
[0020] As noted with respect to FIG. 4, the dynamic sole of the
present invention provides a rolling motion where a previous lever
action existed. With normal shoes there are two sounds upon
walking, heel and forefoot. With the dynamic sole of the present
invention, there is one sound of contact as the foot and shoe move
smoothly and quietly over the supporting surface. The result of
this configuration is improved foot function with walking,
race-walking, running and virtually all forward motion activities.
This invention relieves pathomechanics, improves balance and
enhances normal biomechanics. Clearly, the motion is smoother
resulting in one's immediate recognition that it is easier to walk
employing a shoe having the dynamic sole of the present
invention.
[0021] Further, without departing from the scope of the present
invention, it is noted that midsole 60 can be positioned between
foot cradle 40 and rocker bottom 50 as shown in FIGS. 3A and 3B. As
noted previously, foot cradle 40 is intended to provide a
cushioning and arch support function for one's foot. The relatively
rigid rocker bottom 50 provides the rocking motion, well described
previously. Variable midsole 60 can be configured between these two
elements in order to create a variability in the overall thickness
of dynamic sole 21. This merely enhances the usability of the
present invention in providing various environments for its
application. However, the shape of dynamic sole 21 need not be
maintained strictly through the use of relatively rigid subparts as
suggested above.
[0022] In this regard, reference is made to FIG. 5 depicting sole
70 of the present invention illustrating an embodiment in which an
internal skeletal substructure can be enveloped therein or external
skeletal superstructure to maintain the appropriate shape,
particularly the shape of a lower surface 71. As noted, a
relatively rigid skeletal arrangement can be contained within the
dynamic sole of the present invention showing section 73 located
beneath sub-talar joint 31 (FIG. 2) while upturned skeletal portion
72 is intended to reside beneath heel 32 (FIG. 2) and upturned
elongated skeletal portion 74 to reside below metatarsal region 33
(FIG. 2). This skeletal arrangement which can be configured out of
virtually any rigid plastic or metal subframe can be employed
herein without departing from the spirit and scope of this
invention.
[0023] In viewing the various figures, it is quite apparent that
the convex lower portion, described as subpart B of dynamic sole 21
or as shown as skeletal section 73 of dynamic sole 70 is designed
to extend along the anticipated width of the sub-talar joint to
create a balanced platform or "sweet spot." Others have suggested a
raised point to provide pressure upon one portion of a user's foot
but no one, prior to the present invention, has suggested a convex
region consisting of a balance platform extending the distance of
the sub-talar joint.
[0024] Finally, although the present invention is intended to be
incorporated with the construction of a total shoe (unibody), the
foot cradle certainly can be extended for use as an arch support or
applied to a foot prior to slipping the foot into a conventional
shoe. All of these iterations of this invention would provide the
benefits as outlined previously. Various modifications of the
invention in addition to those shown and described herein will
become apparent to those skilled in the art from the foregoing
description and accompanying drawings. Such modifications are
intended to fall within the scope of the appended claims.
* * * * *