JP3557526B2 - Shoe sole - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shoe sole. In particular, the present invention provides a multi-layer comprising a combination of a midsole mounted between the outsole and the upper, and a heel member, having improved walking functionality, especially shock absorption and ventilation in the shoe. The present invention relates to a structure of a shoe sole having a function.
[0002]
One of the important requirements for shoes is good walking. The walkability of a shoe is related to the shock absorbing performance of the shoe. In other words, the body movement of walking is (1) a weighted initial movement in which the heel touches the ground, and (2) a weighted middle movement in which the weight is supported by putting the weight on the outside from the outside of the arch and moving the center of gravity forward while supporting the weight. Operation, (3) a kick operation in which the leg is tilted forward and the base of the toe expands, that is, the ball portion is bent to raise the heel, and the spring of the arch portion of the arch works upward, that is, a late-loading operation. And (4) an operation of moving the body by repeating the four operations of the preparation operation. In each of these operations, the better the shock absorbing performance of the shoe is, the less the load applied to each part of the foot by the walking motion is, and the better the walking property or walking feeling is.
[0003]
By the way, in addition to the above-mentioned walking property or walking sensation, the requirements required for shoes include the ventilation or ventilation inside the shoe. Usually, it is said that about 2000 cc of sweat is released from an adult's foot in a week. Most of them evaporate, but a considerable amount remains and is absorbed and retained in members such as the upper of the shoe and the midsole, causing stains on the feet, generation of bacteria, and odor. To prevent this, it is desirable to change the shoes frequently, to dry, or to wash.
[0004]
In recent years, it has been proposed that the sole itself has a ventilating structure. The mainstream of the conventional structure that gives the shoe ventilation is to provide a ventilation groove in the longitudinal direction of the midsole of the shoe sole, to form a ventilation hole in the thickness direction of the midsole, or to have air inside the heel. A pump, a cylinder, and a chamber are inserted, and air is circulated by a compressive force caused by a walking operation in connection with the ventilation groove or the ventilation hole.
[0005]
However, as in this prior art, the heel is greatly hollowed out to form a recess, and an air pump, a cylinder, or a chamber is inserted into the recess and connected to a ventilation groove or a ventilation hole formed in the midsole. The structure in which air is circulated by the compressive force of the walking motion is a foreign material made of a material different from the material of the heel, that is, the air pump, the cylinder, or the chamber is embedded in the heel, so the heel itself Not only is the shock absorbing power originally possessed reduced, but also the weight of the heel itself is increased, or the flexibility of the front tread of the sole integrated with the heel is reduced, and as a result, the heel and There is a disadvantage that the shock absorbing performance of the entire midsole is reduced. Further, in the above-described walking operation, that is, in the weighted initial operation, the middle-weighted operation, or the late-weighted operation, the shock absorbing performance is sacrificed, or in the weighted initial operation, the middle-weighted operation, or the late-weighted operation. There is a disadvantage that ventilation and shock absorption cannot be simultaneously exhibited.
[0006]
[Problems to be solved by the invention]
Therefore, the main problem to be solved by the invention is to make the structure of the sole consisting of the combination of the midsole and the heel member not only exhibit the ventilation function or the shock absorbing function but also exhibit the ventilation function. At the same time, it was not possible to make the structure exhibit the shock absorbing function.
[0007]
Another problem to be solved by the invention is to provide a structure of a shoe sole composed of a combination of a midsole and a heel member, while exhibiting a ventilation function and simultaneously exhibiting a shock absorbing function in the weighted initial operation and the weighted middle operation. In the latter stage of the weighted operation, a multi-functional structure capable of exhibiting the transition from the shock absorption to the rebound operation could not be obtained.
[0008]
Still another problem to be solved by the invention is that the synergistic effect of the internal structure of the midsole and the heel member and the material performance of the midsole and the heel member exerts a ventilating function and simultaneously exhibits a shock absorbing function. That is, it was not possible to exhibit the multiplexing function.
Other problems and advantages to be solved by the invention will be clarified below.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present inventor has proposed that the material of the midsole and the heel member has a shock absorbing function, and that the structure of the midsole and the heel member has a structure exhibiting a ventilation function. That is, it was studied that the sole of the combination of the midsole and the heel member exerts the ventilation function and the shock absorbing function simultaneously by the synergistic action of the material performance and the structure of the midsole and the heel member.
[0010]
Thus, as in the present invention, the shoe sole comprises a midsole having a toe portion, a tread portion, and a heel portion, a horseshoe-shaped plastic component, and a heel member. The specific gravity is in the range of 0.15 to 0.45 and the C type hardness is in the range of 50 to 70. The horseshoe-shaped midsole underside convex part is formed integrally with the midsole on the underside of the heel part of the midsole. That the upper surface side ventilation groove having a predetermined width and depth is formed on the upper surface side of the midsole from the heel portion to the toe portion via the tread portion, and the heel portion of the upper surface side ventilation groove A ventilation through hole having a predetermined diameter and being connected to the upper surface side ventilation groove is formed so as to penetrate the heel portion and the midsole lower surface side convex portion, on the outer periphery of the lower side heel portion of the midsole. Open inside and outside of the midsole for ventilation The midsole has a heel outer peripheral ventilation groove that is connected to it, a waterproof ventilating sheet is joined to the midsole lower surface side convex portion to close the ventilation through hole, and the midsole lower surface side convex portion A plastic part having the same shape as the lower surface of the midsole on the lower surface side, a specific gravity of 1.00 ± 0.30, a JA type hardness of 70 to 95, and a through hole formed in the thickness direction is joined to the lower surface. And a horseshoe-shaped heel member having a closed recess on the lower surface of the plastic component is adhered and fixed.
[0011]
First, the materials used in the shoe sole of the present invention will be described. The midsole is an important member that is inserted between the outer sole and the upper, supports the foot directly with the body that joins the outsole and the upper, and has a function to reduce the impact on the knee received when walking. is there. Thick sponge soles are used in so-called jogging shoes, midsole of sports shoes, etc., which have been increasingly used in recent years.
[0012]
Furthermore, a midsole with excellent cushioning properties is inserted between the outer sole and the upper. The midsole must be lightweight, resiliently cushioned, and flexible enough to follow the complex movements of the foot.
[0013]
In order to exhibit such performance, the specific gravity of the midsole of the present invention is preferably in the range of 0.15 to 0.45, and in the case of manufactured by EVA compression, in the range of 0.20 to 0.25; When produced with polyurethane, the range of 0.32 to 0.34 is preferred. The hardness is a C type hardness, preferably in the range of 50 to 70, more preferably in the range of 60 to 65 in the case of EVA compression, and in the range of 60 ± 3 in the case of polyurethane.
[0014]
Since the specific gravity of the midsole of the present invention is the average specific gravity, the specific gravity may have a distribution depending on the site. That is, it is possible to change the specific gravity of the tread portion, the center portion, the arch portion, and the like, thereby changing the hardness, reducing the weight, and changing the shock absorbing performance and the resilience performance of the portions.
[0015]
The midsole of the present invention may be a single layer, or two or more layers, or may have a complicated internal multiplex structure in consideration of various properties such as shock absorption performance, flexibility, hardness, and repulsion.
[0016]
The material of the midsole of the present invention is not particularly limited, as long as it is molded so that the specific gravity and the hardness are in the above-mentioned ranges. However, polyolefin-based materials such as polyethylene and ethylene-vinyl-acetate copolymer (EVA) are used. It is preferable to use a resin, natural or synthetic rubber, urethane resin, or a mixture thereof.
[0017]
The specific gravity of the heel member integrated with the midsole of the present invention is preferably in the range of 0.20 to 0.50, and preferably 0.20 to 0.35 when manufactured by EVA compression. The hardness is a C type hardness, preferably in the range of 55 to 75, and in the case of EVA compression, in the range of 55 to 70.
[0018]
The material of the heel member integrated with the midsole of the present invention is not particularly limited as long as it is molded so that the specific gravity and the hardness are in the above-described ranges. It is preferable to use a polyolefin-based resin such as a coalesced (EVA) resin, a natural or synthetic rubber, a urethane-based resin, or a mixture thereof.
[0019]
The midsole resting on top of the midsole of the present invention may be of materials commonly used in the shoemaking industry.
[0020]
Next, the midsole of the present invention, a midsole lower surface side convex portion integrally attached to the midsole, a plastic part joined to the midsole lower surface side convex portion, and a shoe sole structure including a heel member material will be described. Explain. In the following description, the upper surface of the midsole means the upper or midsole surface of the midsole, and the lower surface of the midsole means the outer bottom surface or the ground-side surface of the midsole.
[0021]
The midsole upper surface side ventilation groove having a predetermined width and depth from the heel portion toward the toe is formed on the upper surface side of the midsole of the present invention.
[0022]
This midsole upper surface side ventilation groove may be branched into at least two near the tread portion, or the branched branch ventilation groove may be branched toward at least one of the left and right sides of the midsole, Further, the branched ventilation grooves may be connected by another ventilation groove.
[0023]
In this manner, the midsole upper surface side ventilation groove formed from the heel toward the toe is branched a plurality of times to enhance the diffusion effect of air flowing through the ventilation groove from the heel toward the toe. be able to.
[0024]
At least one ventilation through hole is formed in the heel portion of the midsole of the present invention in the thickness direction of the midsole. This through hole is connected to the midsole upper surface side ventilation groove. Furthermore, this ventilation through hole is connected to a midsole lower surface side heel side surface ventilation groove formed toward a side opposite to a side surface of a heel portion on a lower surface side of the midsole described later.
[0025]
On the heel portion on the lower surface side of the midsole of the present invention, a midsole lower surface side convex portion substantially similar to the shape of the heel portion and slightly smaller than the heel portion is integrally provided with the midsole. The lower surface of the midsole has a substantially horseshoe shape with a closed outer shape, and becomes thinner toward the heel of the sole.
[0026]
On the side where the lower surface of the midsole of the present invention is in contact with the midsole, a portion corresponding directly to the side surface ventilation groove of the lower surface of the heel of the midsole, the side surface ventilation of the convex portion toward the opposite side of the lower surface of the midsole. A groove is formed. The convex side surface ventilation groove is integrated with the midsole lower surface heel side surface ventilation groove to form a large-diameter ventilation groove, and has an effect of enhancing a suction / exhaust effect described later.
[0027]
A waterproof ventilation sheet is joined to the lower surface side convex portion of the midsole of the present invention so as to cover the ventilation through hole. Air is sucked and exhausted from the ventilation through hole, but water is prevented from entering.
[0028]
The waterproof breathable sheet used in the present invention is not particularly limited, and may be a commercially available sheet.
[0029]
As described above, the midsole lower surface-side convex portion protruding from the heel portion of the lower surface of the midsole according to the present invention has a substantially semi-elliptical outer periphery and becomes thinner toward the heel direction of the shoe sole. In the present invention, a plastic part is joined to the periphery of the convex portion on the lower surface of the midsole.
[0030]
This plastic part has the same outer shape as that of the periphery of the convex part on the lower surface of the midsole, specific gravity of 1.00 ± 0.30, and JA type hardness of 70 to 95.
[0031]
As an example of this plastic part, the outer shape is substantially horseshoe-shaped, a horseshoe-shaped rising portion at the outer peripheral edge, a horseshoe-shaped overhanging portion toward the lower peripheral edge, and a midsole at the inner and outer upper edges. It has a notch connected to the heel outer peripheral ventilation groove to form an opening that opens toward the toe.
[0032]
At the upper edge of this open-type horseshoe-shaped plastic part, that is, at the edge in contact with the lower surface of the midsole, a notch of a horseshoe-shaped plastic part is provided at a position corresponding to the heel side ventilation groove and the convex side ventilation groove. Since it is formed, the midsole lower surface side heel side ventilation groove, the convex portion side ventilation groove, and the horseshoe-shaped plastic component notch are integrated to come into contact with the outside air.
[0033]
The heel member includes a heel member rising portion, a heel member overhanging member integrally formed with the heel member rising portion and formed so as to completely correspond to the overhang portion of the horseshoe-shaped plastic part, and a heel for closing the horseshoe shape. It has a member lateral member and forms a heel member closing recess. Accordingly, the heel member closing recess and the midsole lower surface side protrusion joined and integrated with the heel member closing recess form an air chamber.
[0034]
The shoe sole of the present invention is manufactured by integrating the above-described midsole, a plastic component, and a heel member.
[0035]
Furthermore, by attaching the midsole to the upper surface of the structure in which the midsole, the plastic parts, the heel member, and the outer sole are bonded and integrated, and by providing the midsole with a midsole through hole connected to the upper surface side ventilation groove, Air containing moisture or odor inside the shoe is exhausted to the outside through the upper side ventilation groove through the upper side ventilation groove, and conversely, into the shoe through the upper side ventilation groove from the mid sole outer circumference ventilation groove through the upper side ventilation groove. Outside air is sucked in, and the air inside the shoe is recirculated.
[0036]
Next, the function of the sole of the present invention will be described. Since the midsole having the step portion and the heel portion is made of a sponge having a low specific gravity and a low hardness, the sponge itself has an excellent shock absorbing function. As described above, by imparting a specific gravity and hardness distribution according to the midsole portion, or by changing the internal structure, a more complicated shock absorbing function can be achieved.
[0037]
Next, the relationship between the lower surface side convex portion of the midsole, a plastic component fixed to the lower surface around the lower surface side convex portion of the midsole, and the heel member closing concave portion will be described.
[0038]
In the initial load operation in which the heel is in contact with the ground, the heel is in an open state with the outside air, and the shock absorbing performance by the physical properties of the material of the midsole functions.
[0039]
From the state where the heel gradually touches the ground and the whole weight starts to hang on the heel, in the weighted mid-term operation to support the weight by moving the center of gravity forward while supporting the weight while placing the weight on the outside of the arch and supporting the weight, The state of ventilating with the outside air is gradually restricted, and after the air damper-like shock absorbing function acts, the state shifts to the air chamber state.
[0040]
At the same time that the leg is tilted forward, the ball expands at the base of the toe, that is, the ball portion is bent, the heel rises, and the spring at the arch portion of the arch moves upwards to the kicking operation. The air release state is restricted, and the state becomes an air chamber, and the state changes from the shock absorption to the repulsion state in combination with the repulsion function of the heel member having high specific gravity and high hardness.
[0041]
In the entire operation from the initial stage of weighting to the late stage of weighting, the hard plastic parts cause the foot to lean inward too much (overpronation) or conversely, the foot to lean outward too much (oversupination). Nation) is prevented.
[0042]
By the pump action by the air chamber state from the latter half of the load to the later stage of the load, the air is sucked in from the outside through the midsole lower side heel side side ventilation groove, the convex side surface ventilation groove, and the through hole or cutout of the hard plastic part. The outside air is forcibly circulated from the ventilation through hole of the midsole to the upper surface side ventilation groove of the midsole. The forcibly circulated outside air flows into the inside of the shoe from the hole in the midsole or insole of the shoe, and is ventilated with the humid air that has stayed therein, thereby improving the bad environment such as the temperature and humidity inside the shoe.
[0043]
Since the waterproof ventilation sheet is inserted into the lower surface side convex portion of the midsole, water can be prevented from entering the inside of the shoe from the ventilation groove opened toward the outside of the shoe.
[0044]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded view showing one embodiment of the present invention. 1A is a perspective view showing the upper side of the midsole, FIG. 1B is a perspective view showing the lower side of the midsole, FIG. 1C is a perspective view showing a horseshoe-shaped plastic part, FIG. 1D is a perspective view showing a heel member, and FIG. FIG. 2 is a perspective view showing an outsole. 2 is a cross-sectional view of the heel of the embodiment shown in FIG. 1, and FIG. 3 is a cross-sectional view of the embodiment shown in FIG. 1 in the width direction of the heel.
[0045]
The midsole 1 of the present invention shown in FIG. 1A is manufactured by EVA compression, and has a specific gravity of 0.20 and a hardness of 60 as measured by C type. The midsole 1 includes a toe portion 2, a step portion 3, and a heel portion 4. It should be understood by those skilled in the art that the toe portion, the tread portion, and the heel portion refer to the approximate location corresponding to the foot, and are not precisely limited.
[0046]
The midsole 1 was provided with an upper surface side ventilation groove 5 having a depth of 3 mm and a width of 4 mm from the heel portion 4 to the toe portion 2 via the tread portion 3. The upper surface side ventilation groove 5 is bifurcated at a branch point 6 near the tread portion 3 to form a branch ventilation groove 7, and the branch ventilation groove 7 is a lateral ventilation groove 8 facing both sides of the midsole 1. Was connected.
[0047]
In the upper surface side ventilation groove 5, three ventilation through holes 9 having a diameter of 3 mm penetrating the heel portion 4 and the midsole lower surface side convex portion 10 protruding from the heel portion 4.
[0048]
As shown in FIG. 1B, three midsole heel outer peripheral ventilation grooves 11 are provided on the lower side heel of the midsole 1 and open on both left and right sides of the heel of the midsole 1. The three midsole heel outer peripheral ventilation grooves 11 were respectively connected to the three ventilation through holes 9, and thus were connected to the upper surface side ventilation hole 5.
[0049]
On the lower side heel portion of the midsole 1, a midsole lower side convex portion 10 having a thickness of 7 mm, a maximum width in the toe direction of 45 mm, and a length of 65 mm in a horseshoe shape as shown in FIG. 1B is integrally formed. did. As described above, three ventilation through-holes 9 were passed through the midsole lower surface side convex portion 10.
[0050]
Further, reference numeral 12 in FIG. 1B indicates a waterproof ventilation sheet. As shown in the cross-sectional view of the heel portion of FIG. 2, the waterproof ventilation sheet 12 was bonded to the lower surface side convex portion 10 of the midsole so as to cover the entire three ventilation holes 9.
[0051]
Due to the presence of the waterproof ventilation sheet 12, even if water enters through the midsole heel outer peripheral ventilation groove 11 which is open on the left and right sides of the heel of the midsole 1, the water enters the shoe through the ventilation through hole 9. Is completely prevented. On the other hand, due to the characteristics of the waterproof ventilation sheet 12, there is a function of ventilating the inside air and the outside air of the shoe.
[0052]
The waterproof breathable sheet 12 used in the present invention may be commercially available, and is not particularly limited. For example, “Proteintex” (registered trademark), “proof guard” (registered trademark), “entrant” "(Registered trademark name)," Azekura "(registered trademark name)," Sights "(registered trademark name) and the like can be used.
[0053]
FIG. 1C shows the plastic part 13. The plastic part 13 was manufactured by injection molding such that polyvinyl chloride had a specific gravity of 1.25 and a hardness of 85 ± 5 as measured by a JA type. The plastic part 13 is in the shape of a horseshoe, has a maximum height of 15 mm, and has a rising part 14 whose tip facing in the direction of the toe is slightly downwardly inclined toward the lower surface of the midsole. From the lower edge, an overhang 15 having a width of 15 mm is formed inward, and an opening 17 is formed as a whole, which is open in the toe direction. Further, three notches 16 were formed at predetermined positions on the upper edge of the rising portion 14. The three notches 16 correspond to the three midsole heel outer peripheral ventilation grooves 11, respectively, and are combined to form one ventilation hole.
[0054]
The plastic part 13 shown in FIG. 1C is configured such that the open part 17 of the plastic part 13 is fitted and fixed to the midsole lower surface side convex part 10 having an outer shape of a horseshoe.
[0055]
FIG. 1D shows the heel member 18. The heel member 18 was manufactured by EVA compression so that the specific gravity was 0.3 and the hardness measured by the C type was 65. The heel member 18 has a horseshoe-shaped outer shape, a maximum height of 15 mm, and a rising portion 19 in which the toe direction is slightly upwardly inclined, and inward from the upper edge of the lower surface side of the midsole of the rising portion 19. The overhanging portion 20 having a width of 15 mm is formed, and the upright portion 19 and the horizontal member 21 formed integrally with the overhanging portion 20 form a horseshoe-shaped closed recess 22.
[0056]
The heel member 18 shown in FIG. 1D includes a projecting portion 20, a rising portion 19, and a horizontal member 21, and forms a closed recess 22.
[0057]
When the overhang portion 20 of the heel member 18 shown in FIG. 1D and the overhang portion 15 of the plastic component 13 shown in FIG. 1C are joined together, the midsole lower surface side convex portion 10 is fitted into the closed concave portion 22. To be fixed.
[0058]
Reference numeral 23 in FIG. 1E denotes an outer sole manufactured to have a specific gravity of 1.20 and a hardness of 65 ± 3 as measured by a JA type. ,
[0059]
An open portion 17 of the horseshoe-shaped plastic part 13 shown in FIG. 1C is fitted and fixed to a horseshoe-shaped outer peripheral portion of the midsole lower surface side convex part 10 shown in FIG. 1B. When the overhang portion 20 of the heel member 18 shown in FIG. 1D is bonded and fixed, an air chamber 24 is formed as shown in FIGS. 2 and 3.
[0060]
Finally, the outer sole 23 shown in FIG. 1E is bonded to the entire lower surface of the midsole 1 and the heel member 18, and the insole 25 and the upper are bonded to the upper surface of the midsole 1 as shown in FIG. By doing so, the final shoe is completed.
[0061]
At an arbitrary position on the inner bottom 25, an inner bottom ventilation hole 26 connected to the upper surface side ventilation groove 5 is formed. By adopting such a ventilation structure, warm air containing moisture and odor inside the shoe flows from the inner bottom ventilation hole 26 to the upper surface side ventilation groove 5 and the ventilation through hole according to the weighting operation due to weight shift during walking. 9, the air is exhausted to the outside from the midsole heel outer peripheral ventilation groove 11, and further, by the weighting operation due to the weight shift during walking, the cold outside air flows from the midsole heel outer peripheral ventilation groove 11 to the ventilation through hole 9 and the upper surface side. The air is introduced into the shoe from the midsole vent 26 through the ventilation groove 5, and thus the air inside the shoe is recirculated.
[0062]
【The invention's effect】
As described above, in the sole of the present invention comprising the combination of the midsole 1 and the heel member 18, the midsole 1 is made of a material having a low specific gravity and a low hardness, and the heel member 18 has a high specific gravity and a high specific gravity. Since it is made of a material of hardness, the shock absorbing function is exhibited according to the weight shifting operation during walking, and finally, the midsole 25, the midsole 1, the midsole lower surface side convex portion 10, the plastic parts 13, the heel member 18 and the outer sole 23 are joined and integrated to form a shoe sole, an insole 25 is provided with an insole 26, and the insole 26 is formed in the upper surface of the midsole. The upper surface side ventilation groove 5 is connected to the upper surface side ventilation groove 5, and the upper surface side ventilation groove 5 is connected to the ventilation through hole 9 formed in the lower heel portion of the midsole. On both sides Since it is connected with the midsole heel outer peripheral ventilation groove 11 that is being mouthed, warm air containing moisture and foul odor inside the shoe flows from the midsole ventilation hole 26 according to the weighting operation due to weight shift during walking. The air is exhausted to the outside from the heel portion outer peripheral ventilation groove 11 through the upper surface side ventilation groove 5 and the ventilation through hole 9, and further, according to the weighting operation due to the weight shift during walking, cold outside air is ventilated to the mid sole heel outer periphery. The groove 11 is introduced into the inside of the shoe through the insole ventilation hole 26 through the ventilation through hole 9 and the upper surface side ventilation groove 5, so that the air inside the shoe is recirculated and the surface of the midsole lower surface side convex portion 10. Since the waterproof air-permeable sheet 12 is interposed, the infiltration from the outside of the shoe is prevented.
[Brief description of the drawings]
FIG. 1 is an exploded view showing an embodiment of the present invention.
FIG. 1A is a perspective view showing the upper surface side of a midsole.
FIG. 1B is a perspective view showing the lower surface side of the midsole.
FIG. 1C is a perspective view showing a horseshoe-shaped plastic part.
FIG. 1D is a perspective view showing a heel member.
FIG. 1E is a perspective view showing an outer sole.
FIG. 2 is a cross-sectional view of the heel of the embodiment of the present invention shown in FIG.
FIG. 3 is a side sectional view of the embodiment of the present invention shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mid sole 2 Toe part 3 Foot part 4 Heel part 5 Upper surface side ventilation groove 6 Vent groove branch point 7 Branch ventilation groove 8 Lateral ventilation groove 9 Ventilation through hole 10 Midsole lower surface side convex part 11 Midsole heel part outer periphery ventilation Groove 12 Waterproof breathable sheet 13 Horseshoe-shaped plastic part 14 Horseshoe-shaped plastic part rising part 15 Horseshoe-shaped plastic part projecting part 16 Horseshoe-shaped plastic part notch 17 Opening part 18 Heel member 19 Heel member rising part 20 Heel member projecting part 21 Heel member lateral member 22 Heel member closing recess 23 Outer sole 24 Air chamber 25 Midsole 26 Midsole through hole

Claims (7)

A shoe sole comprising a midsole 1 having a toe portion 2, a step portion 3, and a heel portion 4, a plastic component 13, and a heel member 18,
(1) The midsole 1 has a specific gravity of 0.15 to 0.45 and a C type hardness of 50 to 70,
(2) A midsole lower surface side convex portion 10 having a horseshoe-shaped outer shape is formed integrally with the mid sole 1 on the lower surface side of the heel portion 4 of the mid sole 1.
(3) An upper surface side ventilation groove 5 having a predetermined width and depth is formed on the upper surface side of the midsole 1 from the heel portion 4 to the toe portion 2 via the tread portion 3,
(4) The heel portion 4 of the upper surface side ventilation groove 5 has a predetermined diameter and the ventilation through hole 9 connected to the upper surface side ventilation groove 5 passes through the heel portion 4 and the midsole lower surface side convex portion 10. Being drilled,
(5) A midsole heel outer periphery ventilation groove 11 which is open to the inside and outside of the midsole 1 and is connected to the ventilation through hole 9 is formed on the lower surface side heel outer periphery of the midsole 1.
(6) The waterproof ventilation sheet 12 is joined to the lower surface side convex portion 10 of the midsole so as to close the ventilation through hole 9.
(7) Plastic parts having a specific gravity of 1.00 ± 0.30, a JA type hardness of 70 to 95, and a shape substantially the same as the periphery of the midsole lower surface side convex portion 10 around the midsole lower surface side convex portion 10. 13 are joined,
(8) A shoe sole characterized in that a semi-elliptical heel member 18 having a closed concave portion 22 is adhered and fixed to the lower surface of the plastic component 13. The shoe sole according to claim 1, further comprising an inner sole (25) provided with an insole through hole connected to the upper side ventilation groove (5) on the upper surface of the midsole (1). The shoe sole according to claim 1, wherein the upper surface side ventilation groove (5) is branched into a plurality at a branch point (6) near the tread portion (3) to form a plurality of branch ventilation grooves (7). 4. The sole according to claim 3 , wherein the branch ventilation grooves are connected by lateral ventilation grooves. The plastic part 13 is substantially horseshoe-shaped, and has a horseshoe-shaped rising portion 14 at an outer peripheral edge, a horseshoe-shaped overhang 15 directed inward at a lower peripheral edge, and a midsole heel outer peripheral portion at an inner and outer upper edge. The shoe sole according to claim 1, further comprising a notch (16) connected to the ventilation groove (11), and an opening (17) opening toward the toe. The heel member 18 includes a heel member rising portion 19, a heel member projecting member 20 integrated with the heel member rising portion 19, and a heel member lateral member 21 to form a heel member closing recess 22. The shoe sole according to claim 1, wherein 7. The air chamber 24 according to claim 6 , wherein the heel member closing concave portion 22 and the midsole lower surface side convex portion 10 joined and integrated with the heel member closing concave portion 22 via the plastic component 13 form an air chamber 24. Shoe sole.

Images