U.S. patent application number 10/689994 was filed with the patent office on 2004-08-12 for shock absorbing shoe.
Invention is credited to Park, Chul-Soo.
Application Number | 20040154191 10/689994 |
Document ID | / |
Family ID | 33101984 |
Filed Date | 2004-08-12 |
United States Patent
Application |
20040154191 |
Kind Code |
A1 |
Park, Chul-Soo |
August 12, 2004 |
Shock absorbing shoe
Abstract
The present invention discloses a shock absorbing shoe. The
shock absorbing shoe comprises: an upper member which wraps and
protects the instep and ankle; a cushion member which is sutured to
the upper member, improves a frictional force between the sole of a
foot and the ground, and consists of a forefoot portion and a heel
portion each having a recess of a predetermined depth; a buffering
unit which is arranged-in the respective recesses of the forefoot
and heel portions of the cushion member for absorbing shocks while
the wearer is walking or running; an air pumping unit which is
arranged in the recess of the heel portion to perform an auxiliary
buffering action and which supplies air onto the forefoot portion;
and a bottom sole which is mounted on the upper part of the cushion
member and to which the foot sole of the user is tightly attached.
By this, a mutual complementary buffering effect is exhibited by
the coil springs and the auxiliary buffering body and so on, thus
doubling the shock absorbing effect. Therefore, there is no strain
given to the knee or joints of the user, so the convenience of use
and marketability can be enhanced.
Inventors: |
Park, Chul-Soo; (Seoul,
KR) |
Correspondence
Address: |
ROBERT E. BUSHNELL
1522 K STREET NW
SUITE 300
WASHINGTON
DC
20005-1202
US
|
Family ID: |
33101984 |
Appl. No.: |
10/689994 |
Filed: |
October 22, 2003 |
Current U.S.
Class: |
36/28 ;
36/27 |
Current CPC
Class: |
A43B 13/182 20130101;
A43B 7/081 20130101 |
Class at
Publication: |
036/028 ;
036/027 |
International
Class: |
A43B 013/28; A43B
013/18 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 7, 2003 |
KR |
2003-7948 |
Jul 11, 2003 |
KR |
2003-22284 |
Aug 2, 2003 |
KR |
2003-53584 |
Claims
What is claimed is:
1. A shock absorbing shoe, comprising: an upper member which wraps
and protects the instep and ankle; a cushion member which is
sutured to the upper member, improves a frictional force between
the sole of a foot and the ground, and consists of a forefoot
portion and a heel portion each having a recess of a predetermined
depth; a buffering unit which is arranged in the respective
recesses of the forefoot and heel portions of the cushion member
for absorbing shocks while the wearer is walking or running; an air
pumping unit which is arranged in the recess of the heel portion to
perform an auxiliary buffering action and which supplies air onto
the forefoot portion; and a bottom sole which is mounted on the
upper part of the cushion member and to which the foot sole of the
user is tightly attached.
2. The shoe of claim 1, wherein the buffering unit comprises: upper
and lower caps which are symmetrical to each other and has a
plurality of annular flanges projected, the annular flanges having
insert grooves on the inside surfaces facing each other; and coil
springs which integrally connect the upper and lower caps with both
opposite ends being forcedly inserted into annular flange insert
grooves of the upper and lower caps and which have a predetermined
elastic force.
3. The shoe of claim 1, wherein the air pumping unit comprises: an
air pump which is arranged in the recess of the heel portion and
compress air by a shock from the upside; and an air supply pipe
which is extended from one side of the air pump to penetrate the
recess of the forefoot portion and supplies the compressed air from
the air pump to the recess of the forefoot portion.
4. The shoe of claim 3, wherein a plurality of through holes are
formed on the forefoot portion of the bottom sole.
5. The shoe of claim 3, wherein the air supply pipe is formed by
forming a guide groove on the cushion member to a predetermined
depth.
6. The shoe of claim 1, wherein a projecting cushion relatively
projecting toward the heel of the wearer is formed on the heel
portion the cushion member.
7. A shock absorbing shoe, comprising: upper and lower caps which
are symmetrical to each other and have a plurality of annular
flanges projected, the annular flanges having insert grooves on the
inside surfaces facing each other; and coil springs which
integrally connects the upper and lower caps with both opposite
ends being forcedly inserted into annular flange insert grooves of
the upper and lower caps and have a predetermined elastic
force.
8. The shoe of claim 7, wherein the coil springs have a rectangular
cross sectional shape.
9. The shoe of claim 7, wherein an auxiliary buffering body is
additionally sandwiched on a space region between the upper and
lower caps so that it can be mounted adjacent to each of the coil
springs.
10. The shoe of claim 9, wherein the auxiliary buffering body is
formed of rubber.
11. A shock absorbing shoe, which has a sole attached to the bottom
portion of the shoe for protecting the foot sole and forming a
friction with the ground, comprising: a cushion member which has an
upper of the shoe attached thereto to form the shape of the shoe
and a recess of a predetermined shape provided on the bottom
surface; a friction member which is attached to the bottom surface
of the cushion member for forming a friction with the ground; and a
shock absorbing member which is arranged in the recess and has a
predetermined recess formed between the cushion member and the
friction member and several rectangular cross sectional coil
springs elastically mounted between fixed caps.
12. The shoe of claim 11, wherein the shock absorbing member is
formed by mounting fixed caps on upper and lower parts of the
rectangular cross sectional coil springs, passing a wire through
the center of the fixed caps at the upper and lower parts, with
both ends being fixed to the fixed caps, and locating fixed plates
having the same shape as the recess on the upper and lower parts of
the fixed caps.
13. The shoe of claim 11, wherein the recess to be formed on the
bottom surface of the cushion member is formed on the heel portion
and a transparent window portion through which the rectangular
cross sectional coil springs can be seen is formed on a side face
of the recess.
14. The shoe of claim 11, wherein the recess to be formed on the
cushion member is formed on the heel portion and the forefoot
portion.
15. The shoe of claim 11, wherein the rectangular cross sectional
coil springs provided at the shock absorbing member are firstly
compressed when mounted between the fixed caps, and the elastic
force applied to the heel portion is larger than the one applied to
the forefoot portion.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a shoe, and more
particularly, to a shock absorbing shoe which is able to absorb
shocks applied to the foot of a wearer while walking or
running.
[0003] 2. Description of the Related Art
[0004] A shoe is typically constructed of an upper member that
protects the instep and ankle and a sole that protects the sole of
a foot, improves walking and traveling abilities with an increased
friction force to the ground and performs an absorbing action, the
upper member being connected to the sole.
[0005] In order to absorb shocks upon contacting to the ground
through the above-mentioned sole, widely employed are air bags
which have the sole made of a material with a superior expansion
and contraction, i.e., a superior buffering ability, or which have
the buffering function on the sole.
[0006] However, in a case that the sole entirely made of a material
with a superior buffering ability is used, it adds consumers'
economic burden due to a cost increase. Especially, abrasion is
easily occurred upon friction caused by a contact to the ground,
this disables a long time wearing.
[0007] Additionally, in case of employing the air bag, it has an
advantage that the sole can be made of a material strong to
abrasion. On the other hand, it is problematic in that the air bag
is torn by a sharp object to thus run off air and resultantly can
exhibit no buffering effect at all.
[0008] Moreover, noises are generated from a torn part of the air
bag whenever walking, this can make the user feel unpleasant.
SUMMARY OF THE INVENTION
[0009] The present invention has been developed for the purpose of
solving the foregoing problems and thus it is an object of the
present invention to provide a shock absorbing shoe which absorbs
shocks generated upon walking to the maximum by inserting a shock
absorbing member with a rectangular cross sectional coil spring
into the forefoot and heel portions of the sole of a foot and which
allows walking and running without strain by a repulsive force of
the spring.
[0010] To achieve the above object, there is provided a shock
absorbing shoe according to one aspect of the present invention,
comprising: an upper member which wraps and protects the instep and
ankle; a cushion member which is sutured to the upper member,
improves a frictional force between the sole of a foot and the
ground, and consists of a forefoot portion and a heel portion each
having a recess of a predetermined depth; a buffering unit which is
arranged in the respective recesses of the forefoot and heel
portions of the cushion member for absorbing shocks while the
wearer is walking or running; an air pumping unit which is arranged
in the recess of the heel portion to perform an auxiliary buffering
action and which supplies air onto the forefoot portion; and a
bottom sole which is mounted on the upper part of the cushion
member and to which the foot sole of the user is tightly
attached.
[0011] There is provided a shock absorbing shoe according to
another aspect of the present invention, comprising: upper and
lower caps which are symmetrical to each other and have a plurality
of annular flanges projected, the annular flanges having insert
grooves on the inside surfaces facing each other; and coil springs
which integrally connects the upper and lower caps with both
opposite ends being forcedly inserted into annular flange insert
grooves of the upper and lower caps and have a predetermined
elastic force.
[0012] There is provided a shock absorbing shoe according to still
another aspect of the present invention, which has a sole attached
to the bottom portion of the shoe for protecting the foot sole and
forming a friction with the ground, comprising: a cushion member
which has an upper of the shoe attached thereto to form the shape
of the shoe and a recess of a predetermined shape provided on the
bottom surface; a friction member which is attached to the bottom
surface of the cushion member for forming a friction with the
ground; and a shock absorbing member which is arranged in the
recess and has a predetermined recess formed between the cushion
member and the friction member and several rectangular cross
sectional coil springs elastically mounted between fixed caps.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] These and other features, aspects, and advantages of
preferred embodiments of the present invention will be more fully
described in the following detailed description, taken accompanying
drawings. In the drawings:
[0014] FIGS. 1 to 3 are explanatory views showing a shock absorbing
shoe according to a first embodiment of the present invention;
[0015] FIGS. 4 to 6 are explanatory views showing a shock absorbing
shoe according to a second embodiment of the present invention;
and
[0016] FIGS. 7 to 9 are explanatory views showing a shock absorbing
shoe according to a third embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0017] A characteristic construction and the corresponding
operational effects of the present invention will also become
apparent from the detail description of the preferred embodiments
referring to the accompanying drawings that follow.
[0018] FIGS. 1 to 3 are explanatory views showing a shock absorbing
shoe according to a first embodiment of the present invention.
FIGS. 4 to 6 are explanatory views showing a shock absorbing shoe
according to a second embodiment of the present invention. FIGS. 7
to 9 are explanatory views showing a shock absorbing shoe according
to a third embodiment of the present invention.
[0019] Firstly, as shown in FIGS. 1 to 3, the shock-absorbing shoe
according to the first embodiment of the present invention will be
described as follows.
[0020] As shown therein, the shock-absorbing shoe is roughly
divided into an upper member 100, a cushion member 110, a buffering
unit 120, an air pumping unit 130 and a bottom sole 140.
[0021] The upper member 100 is the region wrapping and protecting
the instep and ankle, and is typically formed of a fabric or
leather.
[0022] The cushion member 110 is integrally formed with the upper
member 100 by suturing and carries out the function of improving a
frictional force between the sole of a foot and the ground.
[0023] On a forefoot portion 111 and a heal portion 112 of the
cushion member 110, recesses 113 and 114 of a predetermined depth
are formed respectively
[0024] To the heel portion 112 of the cushion member 110, a
projecting cushion 115 projecting relatively further than
peripheral portions is integrally provided. The projecting cushion
115 is provided to the heel portion 112, which is the portion where
largest shock is applied upon walking or running, in order to avoid
a wearer from feeling by its foot the parts of the buffering unit
120 to be described later upon walking or running so that the
wearer does not feel uncomfortable.
[0025] The buffering unit 120 is provided on the recesses 113 and
114 respectively that are prepared on the forefoot portion 111 and
heel portion 112 of the cushion member 110. They carry out the
function of absorbing shocks while the wearer is walking or
running.
[0026] In a detailed structure of this buffering unit 120, upper
and lower caps 121 and 122 having a symmetrical shape to each other
are located spaced at a predetermined interval on each of the
recesses 113 and 114, and annular flanges 123 and 124 of a
predetermined height are projected on these upper and lower caps
121 and 122 in a direction opposite to each other.
[0027] On the annular flanges 123 and 124, insert grooves 125 and
126 are formed at a predetermined depth.
[0028] Into the insert grooves 125 and 126 of the annular flanges
123 and 124, both opposite ends of coil springs 127 are forcedly
inserted and fixed. By this forced insertion and fixing of the coil
springs 127, the upper and lower caps 121 and 122 as well as the
coil springs 127 are integrally connected to form one assembly.
[0029] Preferably, the coil springs 127 are the ones that are
excellent in elastic force and are not easily elastically deformed
even by a long time, repetitive shock.
[0030] The air pumping unit 130 is provided at the recess 114
formed on the heel portion 112 of the cushion member 110 and
carries out an auxiliary buffering function along with the
above-described buffering unit 120, especially, the function of
supplying air to the sole of the wearer's foot by supplying air to
the forefoot portion 111.
[0031] In a detailed structure of this air pumping unit 130, on the
recess 114 of the heel portion 112, an air pump 131 blasting air as
being compressed by a shock from the upside, that is, a shock
applied while the wearer is walking or running, is located
approximately on the center between the coil springs 127.
[0032] Additionally, an air supply pipe 132 is prepared on at least
one location for guiding the air blasted from the air pump 131 to
the recess 113 of the forefoot portion 111.
[0033] Preferably, the air supply pipe 132 is formed by forming a
guide groove 133 on the upper surface of the cushion member 110 to
a predetermined depth. But the present invention does not limited
thereto and it is also possible to form the air supply pipe 132 as
a separate part.
[0034] In order to supply air to the foot of the wearer in a state
that air is guided to the recess 113 of the forefoot portion 111
via the air supply pipe 132, a plurality of through holes 141 are
formed on the bottom sole 140 corresponding to the forefoot portion
111.
[0035] The shock-absorbing shoe thus constructed according to the
present invention can acquire the shock absorbing effect as shocks
applied to the foot sole while the wearer is walking or running are
buffered by the buffering unit 120, i.e., the coil springs 127,
prepared at the recesses 113 and 114 of the cushion member 110.
[0036] In other words, the effect of buffering the shocks applied
upon walking or running is exhibited as the coil springs 127 are
compressed, thereby preventing the foot of the wearer from getting
strains applied thereto.
[0037] In addition thereto, since the air pumping unit 130 is
provided on the recess 114 formed on the heel portion 112 of the
cushion member 110, that is, since there is provide the air pump
131 that exhibits the buffering effect by blasting air while
compressed when a shock is applied, a more effective buffering
effect can be acquired.
[0038] Furthermore, the air compressed upon operation of the air
pumping unit 130 is guided to the recess 113 of the forefoot
portion 111 via the air supply pipe 132 and simultaneously
introduced into the shoe via the through holes 141 formed on the
bottom sole 140 at the position corresponding to the forefoot
portion 111. By this, the foot of the wearer can be cooled down and
the generation of sweat caused by a long time wearing can be
prevented.
[0039] Next, as shown in FIGS. 4 to 6, the shock absorbing shoe
according to the second embodiment of the present invention will be
described.
[0040] As shown therein, the shock absorbing shoe is roughly
divided into an upper cap 210, a lower cap 220 and coil springs
230.
[0041] The upper and lower caps 210 and 220 are symmetrical to each
other, especially, have annular flanges 211 and 221 of a
predetermined diameter formed projected from the facing inside
surfaces so as to face each other. On these annular flanges 211 and
221, insert grooves 211a and 221a are formed at a predetermined
depth.
[0042] The coil springs 230 are arranged between the upper and
lower caps 210 and 220 to exhibit an actual buffering effect. Both
opposite ends thereof are forcedly inserted into the insert grooves
211a and 221a of the annular flanges 211 and 221, thereby
additionally carrying out the function of integrally connecting the
upper and lower caps 210 and 220.
[0043] In other words, the upper and lower caps 210 and 220 and the
coil springs 230 are integrally connected directly via the coil
springs 230 to form one assembly.
[0044] The coil springs 230 of such a type may be ones having a
circular cross sectional shape, more preferably, rectangular cross
sectional coil springs 230 which are less deformable and are highly
elastic.
[0045] Between the upper and lower caps 210 and 220, there is
generated an unnecessary space region except the regions where the
coil spring 230 is mounted.
[0046] When such a space region is generated, there is a
possibility that noises occurring upon a buffering action through
the coil springs 230 are emitted to the outside. Thus, in order to
prevent this emission and double the buffering effect along with
the coil springs 230, it is preferable that an auxiliary buffering
body 240 is sandwiched between the upper and lower caps 210 and 220
so that it can become adjacent to the coil springs 230.
[0047] Preferably, the auxiliary buffering body 240 is formed of a
material having an elastic force, that is, a rubber or sponge.
[0048] In the shock absorbing shoe of this invention, in a state
that the coil springs 230 are sandwiched between the upper and
lower caps 210 and 220 simultaneously with the auxiliary buffering
body 240 being sandwiched therebetween, that is, in a state that
one assembly is formed, the assembly is positioned on the recess
113 formed on the forefoot portion 111 and heel portion 112 of the
bottom surface of the cushion member 110.
[0049] According to its purpose of use, the auxiliary buffering
body 240 may be selectively sandwiched between the forefoot portion
111 and the heel portion 112.
[0050] Consequently, as the coil springs 230 and the auxiliary
buffering body 240 carry out a buffering action while the user is
walking or running, a burden caused by a shock applied to the
user's foot can be alleviated.
[0051] Since the coil springs 230 sandwiched between the upper and
lower caps 210 and 220 are forcedly inserted into the insert
grooves 211a and 221a formed on the annular flanges 211 and 221 of
the upper and lower caps 210 and 220, it is possible to prevent the
coil springs 230 from falling off as well as the upper and lower
caps 210 and 220.
[0052] That is to say, it is made possible to maintain a mutual
firm assembly state.
[0053] Meanwhile, because the auxiliary buffering body 240
sandwiched between the upper and lower caps 210 and 220 carries out
the buffering action along with the coil springs 230, the buffering
effect can be doubled. Further, the auxiliary buffering body 240
exhibits the effect of blocking the space region between the upper
and lower caps 210 and 220, thereby preventing a noise generating
from the coil springs 230 from being emitted to the outside.
[0054] Next, referring to FIGS. 7 to 9, the shock absorbing shoe
according to the third embodiment is of the present invention will
be described.
[0055] As shown therein, the shock absorbing shoe 300 is comprised
of an upper member 310 wrapping and protecting the instep and ankle
and a cushion member 320 increasing a frictional force between the
sole of a foot and the ground upon walking.
[0056] The cushion member 320 is provided with an inner sole which
is placed on the surface of the cushion member, which is
compressively bonded to the upper member 310 with a bond or coupled
thereto by sewing so as to absorb shocks and achieve a stable
coupling state and which offers wearing stability, air permeability
and absorptivity, but a detailed description and illustration
therefore will be omitted.
[0057] And, the cushion member 320 has a recess 324 of a
predetermined shape concavely formed on the forefoot portion 321
and heel portion 322 of the bottom surface thereof. The heel
portion 322 is pierced to form through holes penetrating the recess
324 from the sides.
[0058] Into the recess 324, a shock absorbing member 340 having the
same shape and height as the recess is inserted and fixed. In the
shock absorbing member 340, fixed caps 343 are covered onto the
upper and lower parts of rectangular cross sectional coil springs
346, a wire 344 passes through the center of the fixed caps 343 and
both ends of the wire 344 are fixed to the fixed caps 343 by
welding or riveting. At this time, the rectangular cross sectional
coil springs 346 are compressed to a predetermined state and fixed
so that it can hold an elastic force suitable for absorbing and
alleviating shocks generated from the sole of a shoe during walking
or running.
[0059] At the center of the fixed caps 343 fixing the wire 344
passing through the center of the rectangular cross sectional coil
springs 346, mounting grooves 342 for fixing the wire 344 are
formed concave so that the fixed end of the wire 344 cannot be
projected to the outside.
[0060] A compression state of the rectangular cross sectional coil
springs 346 mounted between the fixed caps 343 is differently set
according to whether they are mounted on the heel portion 322 or on
the forefoot portion 321. It means that the fixed caps 343 are
arranged on a fixed plate 341 having the same shape as the recess
324 formed on the bottom of the cushion member 320, taking a shock
distribution generated by a human body during walking or running
into account.
[0061] Another fixed plate 341 is placed above the fixed caps 343
mounted on the fixed plate 341. In this state, several fixed caps
343 are welded or inserted into fixed protuberances projected from
the fixed plates so that they cannot move between the fixed plates
341.
[0062] With the shock absorbing member 340 of the above
construction being inserted and fixed into the recess 324 of the
cushion member 320, a friction member 330 made of rubber with high
elasticity is attached to the bottom surface of the cushion member
320 and shock absorbing member 340 to achieve a friction to the
ground. Being inserted and fixed into the recess 324 of the cushion
member 320.
[0063] Further, a cushion material of a transparent type is
inserted into a the through hole perforated in the heel region of
the cushion member 320, to thus form a transparent window portion
323 capable of confirming the shock absorbing member 340 mounted in
the recess 324.
[0064] In the shock absorbing shoe thus constructed of this
invention, the heel portion 322 is firstly contacted to the ground
upon walking or running, then the foot sole is contacted, and then
the forefoot portion 321 is contacted. When the heel portion 322 is
contacted, the shock absorbing member 340 absorbs shocks
concentrated on the heel portion 322 as shown in FIG. 4. That is,
shocks applied to a certain compressed rectangular cross sectional
coil springs 346 are firstly absorbed. Shocks exceeding a
compression state are secondly absorbed as the rectangular cross
sectional coil springs 346 are further compressed.
[0065] In other words, as illustrated in FIG. 4, a concentrated
load passing through the cushion member 320 is firstly transferred
to the fixed plate 341 via the heel portion 322, and the
concentrated load transferred to the fixed plate 341 is dispersed
to the rectangular cross sectional coil springs 346 via the fixed
caps 343 arranged and fixed at their respective position of the
fixed plate 341. Next, the dispersed load is firstly absorbed in
the rectangular cross sectional coil springs 346 that is mounted in
a compressed state, and shocks exceeding the compressed state are
transferred to the rectangular cross sectional coil springs 346. At
this time, the second compression of the compressed rectangular
cross sectional coil springs 346 is performed onto the rectangular
cross sectional coil springs 346 over the heel portion 322, thereby
allowing all of the springs to absorb the dispersed and transferred
load.
[0066] Hence, the concentrated load generated~upon contacting the
heel portion 322 onto the ground is dispersed and transferred to
each of the rectangular cross sectional coil springs 346 in the
process of transferring to the shock absorbing member 340 of this
invention. By this, each of the rectangular cross sectional coil
springs 346 receives a load of a dispersed state and compensates
the shock caused by the dispersed load with a stress against the
load, thereby drastically reducing the shock transferred to the
heel and knee joints of the user.
[0067] And, according to a moving state of the foot, when the user
is moving by the foot sole and the forefoot portion 321, the shock
absorbing member 340 mounted to the forefoot portion 321 in a first
compression state is secondly compressed with a concentrated load.
And, the rectangular cross sectional coil springs 346 of the shock
absorbing member 340 located in the heel portion 322 forms a
repulsive force to provide elasticity to the user's foot.
[0068] The rectangular cross sectional coil springs 346 of the
shock absorbing member 340, which are compressed in the forefoot
portion 321 by a continuous movement of the foot, transfers to the
user a repulsive force corresponding to the compression state as
soon as the foot is released from the ground. Thus, while the user
is walking or running, the shock caused by its weight is absorbed
in the shoe 300. Besides, the repulsive force corresponding to the
elasticity for compression is transferred to the foot, thereby
enabling the user to walk or run without strain.
[0069] The rectangular cross sectional coil springs 346 contracting
and repulsing in the shock absorbing member 340 as seen from above
are mounted between the fixed caps 343 and around the wire 344. In
this state, since the fixed caps 343 are located on the fixed plate
341 in a fixed state, a concentrated load is transferred via the
fixed plate 341 made of a high surface strength material when the
heel portion 322 is contacted to the ground, thereby achieving a
stable compressing action. Moreover, since the rectangular cross
sectional coil springs 346 have a cross section of a flat,
rectangular shape, whatever direction the concentrated load may be
applied from, the rectangular cross sectional coil springs 346
achieve a stable compression state by means of the fixed plate
341.
[0070] Furthermore, since the installation state of the shock
absorbing member 340 and the elastic state of the rectangular cross
sectional coil springs 346 can be visually confirmed through the
transparent window portion 323 formed on the heel portion 322 of
the cushion member 320, this improves the user's certainty of the
functionality.
[0071] As seen from above, according to the shock absorbing shoe
according to the present invention, a mutual complementary
buffering effect is exhibited by the coil springs and the auxiliary
buffering body and so on, thus doubling the shock absorbing
effect.
[0072] Therefore, there is no strain given to the knee or joints of
the user, so the convenience of use and marketability can be
enhanced.
* * * * *