U.S. patent application number 12/011095 was filed with the patent office on 2008-09-04 for spring cushioned shoe.
Invention is credited to Andrew B. Krafsur.
Application Number | 20080209762 12/011095 |
Document ID | / |
Family ID | 39732084 |
Filed Date | 2008-09-04 |
United States Patent
Application |
20080209762 |
Kind Code |
A1 |
Krafsur; Andrew B. |
September 4, 2008 |
Spring cushioned shoe
Abstract
A spring cushioned shoe is disclosed. The shoe includes a sole
assembly that has a first encapsulating spring enclosure with
spring disposed within a vacuity of the heel region and a second
encapsulating spring enclosure with spring disposed within a
vacuity of the toe region. The springs are, e.g., wave springs that
extend to the upper and lower boundaries of the encapsulating
spring enclosure.
Inventors: |
Krafsur; Andrew B.; (El
Paso, TX) |
Correspondence
Address: |
R WAYNE PRITCHARD
300 EAST MAIN, SUITE 1240
EL PASO
TX
79901
US
|
Family ID: |
39732084 |
Appl. No.: |
12/011095 |
Filed: |
January 24, 2008 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
60897605 |
Jan 26, 2007 |
|
|
|
Current U.S.
Class: |
36/27 ; 36/29;
36/35R |
Current CPC
Class: |
A43B 7/1435 20130101;
A43B 21/26 20130101; A43B 7/1425 20130101; A43B 7/144 20130101;
A43B 13/183 20130101 |
Class at
Publication: |
36/27 ; 36/29;
36/35.R |
International
Class: |
A43B 13/28 20060101
A43B013/28; A43B 13/20 20060101 A43B013/20; A43B 21/26 20060101
A43B021/26 |
Claims
1. A shoe comprising a shoe sole defining a vacuity and an
encapsulating spring enclosure with spring disposed within such
vacuity.
2. The shoe of claim 1, wherein the vacuity is disposed within the
heel region of the shoe sole.
3. The shoe of claim 2, further comprising a pair of vertically
opposed plates, disposed on upper and lower ends of the spring
encapsulating enclosure, wherein the spring is mounted within the
enclosure between the opposed plates.
4. The shoe of claim 1, wherein the shoe sole further defines a
second vacuity and an encapsulating spring enclosure with spring
disposed within such vacuity.
5. The shoe of claim 4, wherein the first vacuity with
encapsulating spring enclosure with spring is disposed within the
heel region of the shoe sole, and the second encapsulating spring
enclosure with spring is disposed within the ball region of the
shoe sole.
6. The shoe of claim 5, wherein the spring and the second spring
are both crest-to-crest multi-turn wave springs.
7. The shoe of claim 4, wherein the first and second encapsulating
spring enclosures are hermetically sealed.
8. The shoe of claim 4, wherein the first and second encapsulating
spring enclosures contain ambient air at atmospheric pressure.
9. The shoe of claim 1, wherein the spring is a multi-turn wave
spring.
10. A shoe comprising a shoe sole including outer sole, an inner
sole, and a mid-sole disposed above the outer sole and below the
inner sole, the middle sole defining a vacuity and an encapsulating
spring enclosure with spring disposed within such vacuity, and a
second vacuity and an encapsulating spring enclosure with spring
disposed within such vacuity.
11. The shoe of claim 10, wherein the first and second springs are
multi-turn wave springs.
12. A shoe sole assembly comprising a compressible material
defining a vacuity and an encapsulating spring enclosure with
spring within the vacuity.
13. A shoe sole assembly comprising a sole member defining a
vacuity and an encapsulating spring enclosure with spring within
the vacuity.
Description
PRIORITY CLAIM
[0001] Applicant claims priority based upon U.S. Provisional
Application No. 60/897,605 filed Jan. 26, 2007.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] This invention relates to an improvement to the existing
technology surrounding wave spring cushioned shoes. Specifically,
prior wave spring cushioned shoes, as disclosed in U.S. Pat. No.
6,282,814 and U.S. Pat. No. 6,665,957, have utilized a fluid flow
passageway to move fluid, such as air, from the heel portion of the
shoe to the ball portion of the shoe during impact. The present
invention eliminates the need of the fluid flow passageway.
[0004] 2. Description of the Prior Art
[0005] One of the most basic laws of physics is that for ever
action there is an equal and opposite reaction. In terms of shoes
and running, this means that for every step down ("foot strike"),
there is an equal and opposite force exerted back towards the shoe
and ultimately the person wearing the shoe. If life were but one
step perhaps the forces involved would be inconsequential. But
life, like running, is not a single step but a repetition of many
steps. The forces that must be absorbed by a shoe and the wearer of
the shoe over the course of a single event are tremendous and have
spurred on countless inventions aimed at cushioning shoe impact
forces.
[0006] U.S. Pat. No. 6,282,814 (the '814 patent) discloses a spring
cushioned shoe wherein the springs are sealed within vacuities
formed in the soles of the shoe. When the springs are sealed within
a vacuity, the air within the vacuity is an integral part of the
spring system. During a foot strike, air sealed within the vacuity
behaves as an ideal gas and follows the numerical expression
"PV=NRT." Since temperature is constant, the pressure of the air
varies inversely with the volume as the vacuity is compressed. In
lay men's terms, as the volume of the vacuity is compressed during
a foot strike, the air pressure within the vacuity increases and
exerts a return force. While this aspect of air within the vacuity
adds to the effectiveness of the spring system, air can and does
interfere with the predictable operation of the spring and in such
way can have a detrimental effect on the spring system To reduce
the air interference on the spring, a fluid flow passageway, such
as that discussed in the U.S. Pat. No. 6,665,957 (the '957 patent),
can be used. The heel region of the shoe is the first to make
contact with the ground during a foot strike. As the springs of the
heel region are compressed, the fluid flow passageway of the '957
patent allows air to escape to the toe region of the shoe. As
weight is transferred from the heel to the toe region of the shoe,
the air escapes back into the heel region.
SUMMARY OF THE INVENTION
[0007] One would not have to have a degree in manufacturing to
appreciate that if the fluid flow passageway could be eliminated, a
reduction in manufacturing costs would be achieved while still
maintaining the effectiveness of the shoe springs. It is therefore
an object of the present invention to provide for an effective shoe
spring without the necessity of the fluid flow passageway.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a side view of the self contained toe insert.
[0009] FIG. 2 is a top view of the self contained toe insert.
[0010] FIG. 3 is a top view of the self contained heel insert.
[0011] FIG. 4 is a top view of the self contained heel insert.
[0012] FIG. 5 is a top view of the sole of a shoe depicting both
the heel and toe insert.
[0013] FIG. 6 is a close up illustration of the wave springs of the
current invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0014] The detailed embodiments of the present invention are
disclosed herein. It should be understood, however, that the
disclosed embodiments are merely exemplary of the invention, which
may be embodied in various forms. Therefore, the details disclosed
herein are not to be interpreted as limiting, but merely as the
basis for the claims and as a basis for teaching one skilled in the
art how to make and/or use the invention.
[0015] FIG. 1 depicts a side view of the toe insert showing the
wave springs [1 & 2] contained in a fully encapsulating spring
enclosure [3]. The fluid within the encapsulating spring enclosure
[3] can be any substance that flows such as a gas or a liquid. The
volume of fluid within the encapsulating spring enclosure is
sufficient to allow for enhanced spring performance and is not so
great as to interfere with such performance. As disclosed in the
'814 patent, the wave springs [1&2] are substantially identical
to the multi turn compression springs with distinct crests and
trough described by Greenhill in U.S. Pat. No. 4,901,987. As shown
in FIG. 3 of the '814 patent and FIG. 6 herein, the wave springs of
the current invention have circular flat shim ends [1A & 1B]
and wave crest [1C] and wave trough [1D] with prescribed
periodicity. FIG. 6 illustrates the configuration of wave springs
[1&2] which provide for operationally acceptable force and
deflection for a given free height of the springs. The compression
wave springs of the preferred embodiment of this invention could be
replaced with multi turn wave springs which do not employ flat shim
ends but rather rely on the use of flat end plates in combination
with ordinary wave springs. Although FIGS. 1 and 2 depicts the toe
insert of the present invention with two wave springs [1&2],
any number and combination of wave springs could be used so long as
the effectiveness of the shoe spring was retained.
[0016] FIGS. 3 and 4 illustrate the insert of the present invention
showing the wave spring [4] contained in a fully encapsulating
spring enclosure [5]. As with the toe insert springs, although FIG.
3 shows only one wave spring, any number or combination of springs
could be used so long as the effectiveness of the shoe spring was
retained. FIG. 5 depicts the placement of the encapsulating spring
enclosures [3 &4] into the shoe sole [5]. While the present
invention provides cushioning for a shoe that utilizes wave springs
placed in the ball and heel areas of the sole of a shoe, it should
be obvious to one skilled in the art that the placement of the wave
springs is not limited to only the ball and heel areas of the shoe.
In the present invention the middle portion sole of the shoe sole
assembly is made of foam with vacuities located at or near the ball
and heel regions of the foot in order to accommodate placement of
the springs. There are also numerous other methods and designs to
place the wave springs into a shoe for cushioning and energy
return.
[0017] While the preferred embodiments have been shown and
described, it will be understood that there is no intent to limit
the invention by such disclosure, but rather, is intended to cover
all modifications and alternate constructions falling within the
spirit and scope of the invention as defined in the appended
claims.
* * * * *