KR102048449B1 - An apparatus of absorbing a shock with replaceable fastening means - Google Patents

Abstract

Shock absorbing device with shock absorbing function that can prevent foot disease caused by impact of shoes and reduce fatigue feeling, and can easily change walking posture by quickly and conveniently replacing uneven wear of shoes. It provides a fastening means that can be removed and replaced.

Description

An apparatus of absorbing a shock with replaceable fastening means

The present invention relates to a shock absorbing device having a replaceable fastening means, in particular, a shock absorbing function that can prevent the foot disease caused by the impact of the shoe and reduce the fatigue feeling quickly and conveniently replace the walking posture during the occurrence of shoes wear It can be corrected, and relates to a shock absorbing device including a fastening means that the user can arbitrarily remove and replace.

The bottom of the shoe must also be manufactured in a shape that fits the arch of the foot, so comfortable walking is possible. In practice, raising the heel of the shoe to a suitable height effectively develops the muscles of the lower extremities such as the buttocks, thighs and lower thighs, which are pulled upwards to enhance the legs and maintain the body shape and make it possible to walk properly. Has been proved through many experiments.

When walking, the human body receives a lot of shock, which is about 3 to 7 times the body weight. Most of the shock is the largest in the rear foot during standing, and the maximum impact when walking occurs after the foot is in contact with the ground. As a result, the body shock appears throughout the foot for a short time, especially in the heel of the forefoot, which is higher than in other parts.

Therefore, the shoes should reinforce the functionality of the foot and at the same time achieve the natural motion of the lower limbs during walking, absorb the shock of the heel, which is received from the ground, and protect the foot and body shock, and play a big role in preventing injury. do.

Therefore, techniques for installing a shock absorber on the heel have been developed. Metal coil springs or air pockets applied to these prior arts have a relatively large volume and are difficult to achieve sufficient performance without significantly increasing the height of the existing shoe rear axle in view of sufficient shrinkage. There is a problem of being low.

In addition, such a prior art has a problem that the user with a shock-absorbing function is built in the rear axle of the shoe can not be separated, so that the user can not be arbitrarily separated or replaced as needed, which is very inconvenient in use. .

In this regard, the technique of separating the sole is described in Patent Publication No. 2002-0044120 (June 14, 2002) in "Shoes with detachable soles" to form the engaging protrusion at the edge of the outsole and to the corresponding edge of the sole. The detachable means of the coupling groove is formed to separate the sole. And the effect is that the outsole and the sole of the shoe can be attached and detached, can replace only the worn part, maintain the beautiful appearance by not exposing the detachable means, and standardize the outsole and the sole of the shoe by size to size, color, etc. It can be easily replaced accordingly.

Patent No. 10-1377845 (March 18, 2014) in the "removable exchange device for footwear having a heel wear protection function" to form a fixing hole in the heel of the shoe, etc., insert the nut into the fixing hole and then insert into the nut Insert the bolt and fix the bolt so that it can be idle. Therefore, the footwear removable exchange device can solve the problem that the heel of the footwear is disposed of waste disposal, and can significantly reduce the cost of the footwear purchase by preventing the wear of the footwear heel.

Utility Model Registration 20-0351292 (Sole replacement shoes) of the sole of the shoe replacement type shoes, the concave portion of the concave-convex concave structure (or convex) in the upper part of the sole, which is the bottom of the shoe in detail The sole portion of the main body is composed of the sole of the shoe body formed of several whole and the convex portion (or concave portion) detachably coupled to the concave portion (or convex portion) of the sole of the shoe body. The upper part and the lower part of the sole are detachable by the crimped convex-concave structure, and when the lower part of the sole is worn out, the sole exchanging shoe keeps function.

In these patent documents, it is composed of vertical members (eg, engaging projections, recesses, bolts) as detachment means or fastening means, and thus do not take the role of a cushion, but rather cause foot disease due to impact. And shoes not only protect your feet, but also protect your body. If your feet don't absorb the shock that comes into contact with the ground, they can cause excessive fatigue in your body's musculoskeletal system and cause injury.

In addition, metal coil springs or air pockets applied to the prior arts have a relatively large volume and are difficult to achieve sufficient performance without significantly increasing the height of the existing shoe rear axle in view of sufficient shrinkage. There is a problem of being low. In addition, such a prior art has a problem that the user with a shock-absorbing function is built in the rear axle of the shoe can not be separated, so that the user can not be arbitrarily separated or replaced as needed, which is very inconvenient in use. .

In this regard, Patent Publication No. 10-2016-0128190 (November 07, 2016 ("Shoe Shock Absorbing Device" of the shoe) in the upper part of the cut portion is formed with a slide fastening groove, the lower portion of the cut portion is formed with a slide fastening bar, The two ends of the slide fastening bar is divided into two parts so that the width of both ends is elastically reduced or expanded, and the slide fastening bar is inserted into the slide fastening groove 12 in a slide manner, divided into two parts. Both ends are fixed by engaging with the engaging piece 13. Thus, when the slide fastening bar and the fastening groove are combined, it is difficult to separate and takes a lot of parts.

Patent Publication No. 2002-0044120 (June 14, 2002) Patent 10-1377845 (March 18, 2014) Utility Model Registration 20-0351292 (12 May 2004) Patent Publication No. 10-2016-0128190 (November 7, 2016)

In order to solve the above problems of the prior art, it is an object of the present invention to provide a shock absorbing device that can prevent the disease of the foot due to the impact of the shoes and reduce the fatigue.

Another object of the present invention is to provide a shock absorbing device with a fastening means that can be quickly replaced by the occurrence of uneven wear of the shoe to correct the walking posture.

Still another object of the present invention is to provide a shock absorbing device with a fastening means that allows a user to arbitrarily remove and replace.

Yet another object of the present invention is to provide an air flow path for absorbing air to the shock absorbing device.

Another object of the present invention is to provide a shock absorbing device with a configuration for fastening in a one-touch manner without additional coupling means.

The present invention is to provide a shock absorbing device that can absorb the impact load transmitted from the ground to the body to prevent the disease of the foot caused by the impact of the shoes and reduce fatigue, acting as the upper layer and the sole acting as a midsole Including the lower layer, the upper layer comprises a rear portion corresponding to the rear foot and the middle foot corresponding to the human foot, the upper layer and the lower layer in butyl rubber, to improve the vulcanization characteristics and mechanical strength It is made of a composite material of nanocomposite of pin oxide (graphene oxide), the upper layer includes a plurality of arc plates between the rear portion and the middle foot portion, and correspondingly, the lower layer includes a plurality of arc plates And absorbs the impact between the upper and lower arcs of the lower layer and evenly distributes the unbalanced load. It comprises a tunnel in the longitudinal direction to secure a cross, and a plurality of cutout openings formed between the arc plate end portions of adding neighbor.

In a preferred embodiment of the present invention, the longitudinally long tunnel and the cut opening provide an impact absorbing device for forming an air passage for improving breathability.

In another preferred embodiment of the present invention, there is provided a shock absorbing device comprising a transverse fastening means for fastening the upper layer portion and the lower layer portion detachably replaceable, wherein the upper layer portion and the lower layer portion are detachably slideable. And a transverse fastening means for fastening in a vertical direction, wherein the transverse fastening means of the upper layer is between the arc plates of the upper part and has a longitudinally long elliptical fastening groove having an elliptical hollow part open at one side thereof; A semi-elliptic fastening groove disposed between the arc plates and at the distal end of the foot, wherein the transverse fastening means of the lower layer is between the arc plates of the lower layer corresponding to the arc of the upper layer and protrudes in a longitudinal direction A long fastening bar and a protrusion that is bent in an arc shape at the distal end of the midfoot portion and protrudes It includes a protrusion that is bent in an arc shape from the distal end of the rear end portion and protrudes.

In another preferred embodiment of the present invention, there is provided a shock absorbing device comprising a longitudinal fastening means for fastening the upper layer and the lower layer in a replaceable sliding manner, the longitudinal fastening means of the fastening bar of the lower layer A locking groove formed at both ends, a cap into which the locking groove portion is tightly fitted, and a fixing pin inserted into the cap to prevent the upper layer and the lower layer from sliding longitudinally from each other, wherein the cap includes the locking groove portion. Inserting the front groove and tightly in close contact with the opening formed in the position corresponding to the locking groove and a side portion for fixing the fixing pin and a cutting groove for cutting the central portion of the rear, the fixing pin is It is shaped like a c-shaped to fit in the cutting groove of the cap, the open end, both side and And a hook protruding inwardly from both sides, the hook being fitted into the locking groove of the lower layer through the opening of the cap.

According to another preferred embodiment of the present invention, there is provided a shock absorbing device further comprising a rubber ring groove is provided on both sides of the fixing pin and fixed to the groove for the rubber ring.

By the shock absorbing device described in the above-mentioned problem solving means, it is possible to prevent the disease of the foot caused by the impact of the shoe and reduce the fatigue, and to quickly and conveniently replace the walking posture when the uneven wear of the shoe by the fastening means can correct the walking posture The user can arbitrarily remove and replace the shock absorbing device. It is also possible to provide an air passage for improving breathability.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.
1 is a perspective view of an upper layer part of the shock absorbing device of the present invention.
FIG. 2 is a perspective view of the lower layer portion fastened corresponding to the rear foot section of the upper layer portion of the shock absorbing device of the present invention of FIG.
FIG. 3 is a perspective view illustrating a slide type fastening of an upper layer part of FIG. 1 and a lower layer part of FIG. 2.
4 is a perspective view of a cap to which the locking groove portion of the lower layer is fitted tightly;
5 is a perspective view of a fixing pin fitted into the cap of FIG. 4 to prevent the upper and lower layers from sliding longitudinally with each other;
6 is a perspective view of a modification example of the fixing pin.
Figure 7 is a perspective view of the cap and the fastening pin fastened.
8 is a cross-sectional perspective view of the coupling groove and the coupling bar of another embodiment of the replaceable shock absorbing device.
9 is a perspective view of each of the fastening groove and the fastening bar of FIG. 8.

Specific structural or functional descriptions of the embodiments according to the inventive concept disclosed herein are provided only for the purpose of describing the embodiments according to the inventive concept. It may be embodied in various forms and is not limited to the embodiments described herein.

Embodiments according to the inventive concept may be variously modified and have various forms, so embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments in accordance with the concept of the invention to the specific forms disclosed, it includes all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another, for example without departing from the scope of the rights according to the inventive concept, and the first component may be called a second component and similarly the second component. The component may also be referred to as the first component.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described herein, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined herein. Do not.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Shoes is a generic term that includes functionalization, sports shoes, hiking shoes, walking shoes, casual shoes, work shoes, etc., and shoes are largely according to the shape of the sole, the forefoot corresponding to the heel, and the midfoot and heel corresponding to the central arc. Can be divided into posterior. Sole is divided into insole, midsole and sole.

When walking, the impact force on the heel, which is the posterior foot, is higher than in other parts. Accordingly, by installing a shock absorbing device in the rear foot of the shoe sole to properly absorb the shock generated when the foot contacts the ground to cause excessive fatigue in the human skeletal system of the human body to prevent injury.

First, referring to Figure 1, a perspective view of the upper layer portion 10 of the shock absorbing device of the present invention is shown. The upper layer 10 of the shock absorbing device is adhered to the insole, adhered to the midfoot, and includes a plurality of reinforcing members 18 in the transverse direction that prevent excessive excessive internal and windlass mechanisms that cause plantar fasciitis. A fish tail shaped middle foot 17 and a rear foot are included. The rear foot portion in the preferred embodiment has a longitudinal elliptical fastening groove 12 having a circular arc plate 11 in the longitudinal direction of three arc shapes and an elliptical hollow portion 19 with one part open between them; And semi-elliptic fastening grooves 13, 13 ′ placed between the portion 17 and the arc plate 11 and at the trailing end. Moreover, the cutout opening 15 is formed between the arc boards 11, and the elongate opening 14 is formed in the center of each arc plate 11. As shown in FIG. The cutting opening 15 allows the user to easily separate the upper layer portion 10 and the lower layer portion 20 using fastening means, improve the cushion between them, and also help the circulation of air. The elongate opening 14 is fitted with the projection of the insole fitted.

Next, referring to FIG. 2, there is shown a perspective view of the lower layer portion 20 fastened corresponding to the rear portion of the upper layer portion 10 of the shock absorbing device of the present invention of FIG. 1. The lower layer portion 20 of the shock absorbing device is formed to be detachably fastened to the upper layer portion 10 in a slide manner. In the preferred embodiment corresponding to the circular arc plate 11 of the upper layer 10, the lower layer part 20 has three arc-shaped longitudinal arc plates 21 and a protruding longitudinally long fastening bar between them ( 22) and projections 23 that are bent in an arc shape at the distal end of the middle foot side and protrude, and projections 23 'which are bent in an arc shape from the distal end of the rear foot part and protrude. Locking grooves 26 are formed at both ends of the fastening bar 22. Moreover, the cutout opening 25 is formed between the arc plates 21, and the elongate opening 24 is formed in the center of each arc plate 21. As shown in FIG. The cutting opening 25 also allows the user to easily separate the upper layer 10 and the lower layer 20 by using fastening means, improves the cushion between them, and also helps the circulation of air. The long opening 24 engages with the protrusion of the sole of the shoe and functions to secure the sole.

Next, referring to FIG. 3, there is shown a perspective view illustrating the fastening of the slide system between the upper layer portion 10 of FIG. 1 and the lower layer portion 20 of FIG. 2. An insole protrusion is inserted into and fixed to the long opening 14 in the center of each arc plate 11 of the upper layer part 10. The fastening bar 22 of the lower layer part 20 is inserted into the fastening groove 12 of the upper layer part 10 and is moved and fixed to a position corresponding to each other in a sliding manner. The length of the fastening bar 22 is longer than the fastening groove 23 by the portion of the locking groove 26. Therefore, the position corresponding to each other is a position where the part of the locking groove 26 protrudes from the end of the fastening groove 12. And the projections 23 and 23 'of the lower layer portion 20 are moved to the positions corresponding to each other in a slide manner in the semi-elliptic fastening grooves 13 and 13' of the upper layer portion 10 and fixed to each other. Fastening groove 12 of upper layer 10, fastening bar 22 of lower layer 20, semi-elliptic fastening grooves 13 and 13 'of upper layer 10 and projections 23 and 23' of lower layer 20. The upper layer portion 10 and the lower layer portion 20 are fixed without any fluctuations in the lateral direction by the fastening means including, but can be separated by sliding in the longitudinal direction as opposed to the method of fastening them. In the above described the fastening means of the upper layer 10 and the lower layer 20 in the transverse direction, that is, the front and rear of the shoe. These configurations are collectively referred to as transverse fastening means.

If the upper layer 10 and the lower layer 20 is separated by sliding in the longitudinal direction from each other, a person will not be able to walk wearing shoes equipped with it. Therefore, in addition to the fastening means described above, a longitudinal fastening means for preventing the upper layer portion 10 and the lower layer portion 20 from sliding in the longitudinal direction is further required.

4 shows a perspective view of a cap 30 into which the locking groove 26 portion of the lower layer portion 20 is tightly fitted. The cap 30 has two openings 32 on the side formed at a position corresponding to the locking groove 26 of the lower layer part 20 and the omnidirectional groove 31 which tightly inserts the locking groove 26 portion. It includes a cutting groove 33 to cut a portion of the side and the center portion of the rear to fix the fixing pin to be described later. The shape and dimensions of the front surface of the cap 30 are almost the same as the cross-sectional shape and dimensions of the fastening groove 12 of the upper layer portion 10.

FIG. 5 shows a perspective view of a fixing pin 40 fitted to the cap 30 of FIG. 4 to prevent the upper and lower layers 10 and 20 from sliding longitudinally with each other. Fixing pin 40 has a C-shape as a whole to fit in the cutting groove 33 of the cap 30, and includes an open end, both side portions and the rear portion. And hooks 41 protruding inwardly from both sides. Fixing pin 40 is made of a good elastic material, it can be fixed to the cap 30 by opening the open end with the user's hand. When the hook 41 is fitted into the locking groove 26 of the lower layer part 20, the cap 30 never comes out of the fastening bar 22. Therefore, the lower layer part 20 is firmly fixed to the upper layer part 10 without any fluctuations or gaps in the longitudinal direction.

6 shows a perspective view of a modification of the securing pin 40. Here, the rubber ring grooves 43 are formed at both side surfaces of the fixing pin 40. The rubber ring groove 43 serves to fix the rubber ring 45 more firmly so that it cannot be opened by the elastic force of the fixing pin 40.

7 shows a perspective view in which the cap 30 and the fixing pin 40 are fastened. The cap and securing pin 40 are here referred to as longitudinal fastening means. All four longitudinal fastening means are fastened in the drawing, but only one is shown for explanation.

As shown in FIG. 7, the arc plate 11 of the upper layer portion 10 and the arc plate 21 of the lower layer portion 20 face each other and form a substantially cylindrical tunnel 50 therebetween. Since the materials of the upper layer 10 and the lower layer 20 include vulcanized properties and mechanical strengths improved by synthesizing nanocomposites of butyl rubber and graphene oxide, When the load is applied to the user's foot by the elastic force, it functions as a shock absorbing device. Accordingly, the shock absorbing device includes a circular arc plate 11 of the upper layer portion 10 and an arc plate 21 of the lower layer portion 20, a tunnel 50 formed therebetween, and a cutout opening 15 on the arc plates 11 and 21. , 25). The cutting openings 15 and 25 absorb the impact by deforming the circular arc plates 11 and 21 to a somewhat straight line when a load is applied.

Next, the fastening grooves and the fastening bars in the longitudinal direction are formed to have sufficient space in the tunnel 50 so as to form an air passage for improving air permeability, and the cut openings 15 and 25 and the long openings of the upper and lower layers 10 and 20 are formed. (14, 24) are formed. The tunnels and openings thus formed allow the air to flow smoothly into the insole and the base plate.

Finally, the lower layer portion 20 detachably inserted into the rear foot portion has a bottom plate (not shown) attached to the lower portion of the lower layer portion 20 (not shown) when the wearer wears both sides of the wearer's foot, thereby causing inconvenience to the wearer when walking. If you want to change the shape and color of the sole, and if the wearer wants to change the sole according to the sole's function (for example, an anti-slip, or a high sole), remove and replace them. Should be.

Here is a brief description of the replacement sequence.

First, the elastic rubber ring 45 is pulled off from the rubber ring groove 43 by hand, and the side of the fixing pin 40 is opened to open the hook 41 of the fixing pin 40 so that the locking groove of the lower layer 20 ( And withdraw from the side opening 32 of the cap 30. Then, the cap 30 is separated from the locking groove 26 of the lower layer portion 20, and the lower layer portion 20 is slid from the upper layer portion 10 in the longitudinal direction to be separated. And in the reverse order to fasten the lower layer portion 20 attached to the new bottom plate to the upper layer portion (10). It is noted here that the lower layer 20 is removed from the upper layer 10 and replaced again, which can be replaced easily and quickly with only the wearer's hand without using any tools.

Referring to Figure 8, it includes a transverse fastening means for fastening in one-touch manner to replace and replace the upper and lower layers. The transverse fastening means of the upper layer portion 10 has both ends between the arc plates 11 partially closed, the longitudinally long fastening groove 12 having an arrow-shaped hollow portion, and the transverse direction of the lower layer portion 20. The directional fastening means comprises a protruding arrow-shaped fastening bar 22 between the circular arc plates 21 of the lower layer part 20 corresponding to the circular arc plate 11 of the upper layer part 10. FIG. 9 includes FIGS. 9A and 9B, and FIG. 9A is a perspective view illustrating the fastening groove 12. Here, both ends of each of the fastening grooves at the far end of the fastening grooves 12 long in the longitudinal direction are closed, and when the fastening bar 22 is fitted thereto, they are fixed in the longitudinal direction. 9B is a perspective view illustrating the fastening groove 22. Here, the fastening bar 22 in the center of the longitudinally long fastening bar 22 has a central portion coinciding with the shape of the fastening groove 12 and both ends for preventing longitudinal movement in the fastening groove 12. have. In other words, at least one of the fastening groove and the fastening bar should include both ends to be prevented from moving in the longitudinal direction of the fastening groove and the fastening bar, and to be cut using a cutter.

This embodiment no longer requires additional fastening means, which is slightly opened by the elasticity of the fastening groove 12 when the arrow-shaped fastening bar 22 is inserted into the concave portion of the arrow-shaped fastening groove 12. When the next tightening is completed, it never falls out like a hook. And although the fastening bar 22 can slide in the fastening groove 12 in the lateral direction, since both sides of the fastening groove 12 or the fastening bar 22 are closed, it is firmly fixed and fixed without fear of sliding. Lose.

Next, the replacement procedure in this embodiment will be briefly described.

First, after cutting the closed both sides of both sides of the fastening groove 12 or the fastening bar 22 with a cutter along the perforation line, the fastening bar 22 is slid sideways in the fastening groove 12 and separated. . In order to fix the new lower layer portion 20 to the upper layer portion 10, simply put the fastening bar 22 at the position of the fastening groove 12, and press the fastening bar 22 by hand to fasten the fastening groove 12 to the elasticity. Opening by the arrow-shaped fastening bar 12 is inserted and fixed. This is very simple in a one touch way.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes may be made without departing from the spirit of the present invention. This will be apparent to those of ordinary skill in the art. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

10: upper part
11: arc
12: fastening groove
13: fastening groove
14: opening
15: cutting opening
20: lower floor
21: arc
22: fastening bar
23: turning
24: opening
25: cutting opening
26: locking groove
30: cap
31: Omnidirectional groove
32: opening
33: cutout groove
40: retaining pin
41: hook
43: Groove for Rubber Ring
45: rubber ring
50: tunnel

Claims (7)

As a shock absorbing device that can absorb the impact load transmitted from the ground to the body to prevent the foot disease caused by the impact of the shoes, and to reduce fatigue
An upper layer acting as a midsole and a lower layer acting as a sole, wherein the upper layer includes a foot foot corresponding to a human foot and a foot foot corresponding to a middle foot,
The upper layer and the lower layer are made of butyl rubber, a synthetic material of nano composite material of graphene oxide (graphene oxide) to improve the vulcanization characteristics and mechanical strength,
The upper layer portion includes a plurality of arc plates between the rear portion and the middle foot portion, and correspondingly, the lower layer portion includes a plurality of arc plates, and may absorb shock between the upper layer portion and the arc plates of the lower layer portion. And a longitudinally long tunnel to secure a space for evenly distributing the unbalanced load, further comprising a plurality of cutout openings formed between the neighboring arc plate ends,
A longitudinal fastening means for fastening the upper layer and the lower layer in a replaceable slide manner;
The longitudinal fastening means is a locking groove formed at both ends of the fastening bar of the lower layer portion, the cap is securely fitted to the locking groove portion, and the cap is fixed to prevent the upper layer and the lower layer from sliding to each other in the longitudinal direction Pins,
The fixing pin is a shock absorbing device made of an elastic material. The method of claim 1,
The longitudinally long tunnel and the cut opening form an air passage for improving breathability; The method of claim 1,
A transverse fastening means for fastening the upper layer and the lower layer to be detachably slidably replaced;
The transverse fastening means of the upper layer is between the arc plates of the upper layer, a longitudinally long elliptical fastening groove having an open elliptical hollow portion on one side thereof, and a half placed between the middle foot and the arc plate and at the end of the rear foot. Including oval fastening groove,
The transverse fastening means of the lower layer part is between the circular arc plates of the lower layer corresponding to the circular plate of the upper layer, protruding longitudinally long fastening bars, and protruding protrusions which are bent in an arc shape at the distal end of the middle foot side. A shock absorbing device comprising a protrusion that is bent in an arc shape from the distal end of the foot portion and protrudes. The method of claim 1,
The cap includes an omnidirectional groove that tightly inserts the lock groove portion and an opening in a side surface formed at a position corresponding to the lock groove, and a cut groove in which a portion of the side portion and a center portion of the rear surface of the cap are fixed. Include,
The fixing pin has a C-shape as a whole to fit in the cutting groove of the cap, and includes an open end, both side portions and a rear portion, and a hook protruding inwardly from both sides,
The hook is shock-absorbing device is fitted in a locking manner to the locking groove of the lower layer through the opening of the cap. The method of claim 4, wherein
Rubber absorbing grooves are provided on both sides of the fixing pin further comprises a rubber ring fixed to the groove for the rubber ring. The method of claim 1,
And a transverse fastening means for fastening the upper and lower layers in a one-touch manner so as to be separated and replaced.
The transverse fastening means of the upper layer portion is closed at both ends between the circular arc plate, the longitudinally long fastening groove having an arrow-shaped hollow portion,
The transverse fastening means of the lower layer portion shock absorbing device including a projecting arrow-shaped fastening bar between the arc plate of the lower layer corresponding to the arc plate of the upper layer.
The method of claim 6,
At least one of the fastening groove and the fastening bar has a shock absorbing device that includes both ends to prevent the longitudinal movement of the fastening groove and the fastening bar when they are coupled and cut using a cutter.

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