JP2000083705A - Shoe sole structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shoe sole structure by which the rigidity of the arch of a foot is improved while the cushion performance and stability are secured in the shoe sole structure used for the sports shoes to inhibit the arch of the foot from sinking in or being twisted and realize comfortable running as the whole of the shoe sole. SOLUTION: The shoe sole structure comprises an out sole 6, the heel part of which is rich in wear resistance and non-slip performance and two, upper and lower mid-soles 4, 5 which are flexible and rich in elasticity, wherein a waveform plate 1 made of raw material harder than the mid-sole part is clamped between both mid-soles to make the cushion performace and stability of the heel part compatible with each other. Further, the inner instep side and outer instep side of the arch part of the sole are elongated as shank parts 2, 3 from the front end part of the plate integrally with the plate 1 to reduce the weight of the sole, load (body weight) can be smoothly transferred to the front foot part from the heel landing time, and the occurrence of trouble of the foot part can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The shoe sole structure according to the present invention comprises:
Particularly, it is a sole structure used for sports shoes, etc., in which the heel part is improved in rigidity of the arch part while suppressing cushioning and stability, thereby preventing the arch part from dropping and twisting, To provide a sole structure that realizes comfortable running as a whole.

[0002]

2. Description of the Related Art Many techniques for improving the cushioning property and stability of a heel portion of a shoe sole structure have been disclosed. In particular, the midsole part that is flexible and resilient throughout the sole of the shoe is arranged, and the heel part is made thicker than the forefoot part to secure cushioning, and the instability due to thickening the midsole of the heel part. For the purpose of prevention, a technique of improving stability by arranging a stabilizer made of a hard synthetic resin or the like on a side wall surface of the heel portion or the like has been frequently used. Further, a technique of embedding a wavy elastic plate in the heel of the midsole for the purpose of improving the stability of the heel has been disclosed.

[0003] For example, Japanese Utility Model Laid-Open No.
The shank parts are relatively thin and highly transparent, with the aim of overcoming the various defects of the sole and obtaining an athletic sole with good lightness and not easily deformed as well as good rebound and good appearance. Rolled edges are formed on both sides of the main body side and irregularities are formed on a part or all of the front extended side and the rear extended side, and a color chip is provided between the midsole and the shank part with an adhesive. There is disclosed an athletic shoe sole characterized by forming a pinch connection.

[0004] Further, Japanese Utility Model Registration No. 3018223 discloses that the arch part of the shoe sole is bent in the front-rear direction and the torsion of the front sole part wider than the arch part in the left-right direction is reduced so that the foot can be firmly ground upon hitting the ball. In the sole of the shoe sole provided with a spring plate of a high rigidity material on the arch part of the sole for the purpose of being able to hit the ball in a stable posture, the spring plate is wider than the arch part of the sole. A golf shoe having a pair of reinforcing pieces extending gradually toward both edges of the front bottom is disclosed.

Further, Japanese Utility Model Laid-Open No. 6-41503 discloses that
For the purpose of providing shoes soles that can be used for marathons etc.
The midsole is laminated on the upper surface of the front outsole and the back outsole in a cross-linked manner, and the midsole is fitted with resilient plates on both sides of the upper surface and / or the lower surface of the stepped portion. A sole material for shoes is disclosed.

[0006]

SUMMARY OF THE INVENTION
In the shoe sole disclosed in No. 4703, since the shank parts are arranged on the entire arch portion, the mass of the entire shoe sole is increased, and for example, shoes that are required to be lightweight, such as marathon shoes, There was a problem that it was not suitable.

In the golf shoe described in Japanese Utility Model Registration No. 3018223, a spring plate made of a high-rigidity material for reinforcing the arch portion is provided only forward of the arch portion, so that the golf shoe is stable during a golf swing. Although the property is ensured, since the shank member is not arranged in the area from the arch part to the heel part, when applied to running shoes, the heel part and the arch part are twisted,
In addition to the inconvenience that the arch part is depressed, there is also the inconvenience that it is not possible to prevent harmful pronations on the feet.

Further, in the shoe sole material described in Japanese Utility Model Laid-Open Publication No. 6-41503, although the elasticity plate is provided only on both sides of the arch, the weight is reduced, but the utility model is registered. Similarly to the golf shoe described in Japanese Patent No. 3018223, since the shank member is not connected from the arch part to the heel part, the torsion between the heel part and the arch part and the drop of the arch part have not been solved. Further, in the shoe sole material, the cushioning property and stability of the heel portion have not been improved at all.

In view of the foregoing, the present invention is to prevent the foot from being obstructed by achieving both cushioning and stability of the heel of the flexible midsole, and to prevent (excessive) twisting and arching between the heel and the arch. It is an object of the present invention to provide a lightweight shoe sole structure that prevents a part from dropping and allows a smooth load (weight) to move from the time of landing on the heel to the forefoot.

[0010]

That is, the sole structure according to the present invention comprises an outsole whose heel portion is abrasion-resistant and slip-resistant, and a two-layer upper and lower midsole which is flexible and elastic. By tightly fitting the corrugated plate made of a material harder than the midsole between the soles, it is possible to achieve both cushioning and stability of the heel. Furthermore, by extending the inner and outer sides of the arch part from the front end of the plate to the forefoot part integrally with the plate as a shank part, it is possible to reduce the weight of the shoe sole, and from the time of landing on the heel to the forefoot part. Enables smooth load (weight) movement.

Here, the shank extending from the front end of the plate to the arch may be on both the inner side and the outer side, but the function required for the shoe sole structure depends on the type of competition. In some cases, further weight reduction can be achieved by extending only one of the inner and outer shells to the forefoot as a shank.

Further, in the shoe sole structure, the shank portion is disposed on an arch portion of a midsole, and a winding portion is formed on an outer edge of each shank portion along a side surface of the arch portion of the midsole. By sticking
The rigidity of each shank can be improved. In addition, it is also possible to further enhance the rigidity by providing a concave portion or a convex portion in the longitudinal direction on the ground surface or the winding portion of each of the shank portions.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A shoe sole structure according to the present invention is implemented as follows. That is, the heel portion of the shoe sole structure according to the present invention includes an outsole, a midsole, and a corrugated plate.

The outsole is made of a material having high wear resistance and anti-slip properties, such as solid rubber, foamed rubber, foamed polyurethane or foamed polybutadiene (foamed RB).
As is conventionally done, projections, ridges, grooves, and the like are formed on the grounding surface side to improve slip resistance.

The midsole is made of a flexible and elastic foamed resin material such as EVA sponge, polybutadiene sponge, urethane foam, etc., and is composed of two upper and lower layers. The hardness may be the same or different. There may be. Specifically, the hardness of the midsole is ASKER C
The hardness is suitably about 50 to 70 degrees, and the degree is preferably about 55 to 60 degrees.

A material harder than the midsole portion, such as a relatively hard resin such as a polyurethane resin, a polyamide resin or a polycarbonate resin, or a composite material with a fiber reinforced plastic (FRP) or the like, is provided between the upper and lower midsoles. The corrugated plate is tightly fitted.

The plate is laminated and integrated with the upper and lower mid soles to form a sole structure, but affects the compressive strength in the vertical direction and the stability in the lateral direction of the mid sole.
In particular, the magnitude of the amplitude of the waveform shape has a large effect on the compressive strength and stability. Generally, as the amplitude increases, the compressive strength in the vertical direction increases, and the cushioning property decreases. The deviation of the midsole from the tire is reduced, and the stability is improved. Therefore, in an area where stability is required, the amplitude can be increased by increasing the amplitude of the wave shape of the plate to increase the compressive strength, and conversely, in an area where cushioning is required. By reducing the amplitude of the waveform, the compression strength can be relatively reduced to ensure cushioning.

Further, with respect to the wavelength of the waveform, the compressive strength of the shoe sole structure generally decreases as the wavelength of the waveform increases, and increases as the wavelength decreases. The effect on strength is smaller than the effect of amplitude on compressive strength. Therefore, the wavelength is more effective in changing the traveling direction of the wave than the effect of the change in the wavelength on the cushioning property and stability. For example, in the heel region of the sole structure, the wavelength on the inner side is longer and the wavelength on the outer side is shorter, and the corresponding peaks are opened around the outer side when the corresponding peaks are connected. The waves are arranged in a fan shape. By arranging in this way, when landing sequentially from the heel portion to the toe portion of the shoe, the weight movement path (load path) on the shoe bottom and the traveling direction of the wavy shape of the plate are substantially matched. Can be.
As a result, while achieving both cushioning and stability at the time of landing on the heel part, the heel part is flexibly deformed in accordance with the weight shift, so that smooth weight shift and reliable grip performance can be secured. As described above, the shape, the amplitude, the wavelength, and the traveling direction of the plate according to the present invention are determined according to the use or the sport, but the shape is not particularly limited to the above shape.

The upper and lower midsole according to the present invention and the corrugated plate are tightly fitted by the following method.
That is, the plate and the upper and lower mid soles are formed in a predetermined shape in advance, the upper mid sole is bonded to the upper surface of the plate, and the lower mid sole is bonded to the lower surface. At this time, the bonding interface between each midsole and the plate can be bonded in a completely adhered state, but can also be bonded with a gap partially provided. For example, when a gap is provided along the ridge line or valley line of the corrugated shape of the plate, a gap portion is generated in the width direction of the shoe sole structure. At this time, the shape of the gap is not particularly limited, but a gap or a bottomed hole having a circular or polygonal opening on the side surface of the midsole or a gap where the opening does not appear on the side surface. good.
This gap portion has a function of improving the cushioning property by compressive deformation so as to be crushed when the heel portion lands. Also, the lower midsole does not need to be provided on the front of the shoe bottom,
It is also possible to provide a structure in which a notch is provided in the center region of the heel, and a lower midsole is not provided in the arch. By providing the cutout portion in this manner, a beam structure in which the lower midsole is a supporting point at the time of landing and the plate and the upper midsole are `` beams '' is formed, and the load can be dispersed to further improve the cushioning property. it can. Further, by adopting these structures, the entire shoe sole can be further reduced in weight.

According to the present invention, the plate is adhered as a shank to the entire surface of the arch by extending the inner and outer sides of the arch from the front end of the plate to the forefoot as a shank. The sole can be made lighter than the sole, and a smooth load (weight) can be moved from the time of landing on the heel to the forefoot. In particular, in a shoe sole structure having no lower midsole in the arch portion, the shank portion is formed integrally with the plate arranged on the heel portion, and thus has a function of effectively preventing the arch portion from dropping.

Since the shank portion according to the present invention extends from the front end portion of the plate toward the inner and outer shell sides of the arch portion, it lands at the rear end of the heel during running and lands outside the arch portion. When the load starts to be applied, the outer shank portion supports the deformation of the midsole to prevent the midsole from dropping, and when the load moves from the outside of the arch to the inside of the arch, the inner shank portion suppresses the torsion of the arch portion. At this time, when the load moves from the outer side to the inner side, twisting occurs in the area from the heel to the arch of the shoe sole. Excessive twisting not only results in loss of propulsion, but also in the foot. It can also cause problems. Since the inner and outer shank portions according to the present invention are formed integrally with the plate, the plate absorbs the front-back and up-down deviation of the inner and outer shank portions caused when the sole of the shoe is twisted, so that excessive twisting occurs. Can be suppressed.

The shank portion according to the present invention can extend only one of the inner back side and the outer back side to the forefoot portion depending on the function required for the shoe sole structure due to a difference in a sport type or the like. For example, in short-distance land-based shoes, during a series of running operations, the contact time of the sole is short, and since the forefoot is mainly used, there is almost no weight shift from the outer side to the inner side. The side shank portion is unnecessary, and only the outer side shank portion is provided, so that further weight reduction can be achieved.

The shank portion according to the present invention is generally narrowly fitted between the upper and lower midsoles similarly to the plate, but the lower midsole is divided into a heel portion and a forefoot portion at an arch portion. If so, it will be attached to the ground contact side of the upper midsole. At this time, the rigidity of each shank portion can be improved by forming a roll-up portion along the side surface of the arch portion of the midsole on the outer edge portion of each shank portion and attaching it.

When the shank portion is tightly fitted between the upper and lower mid soles, the winding portion is moved from the parting lines of the upper and lower mid soles to the side surfaces of the upper mid sole arch or the lower mid sole arch. A roll-up portion is formed along the side surface or along both side surfaces of the arch portion of the upper and lower mid soles, and is adhered.

On the other hand, in a shoe sole structure having no lower midsole at the arch, that is, when the lower midsole is divided into a heel portion and a forefoot portion at the arch portion,
The shank portion is attached to the ground surface side of the upper midsole, and a winding portion is formed on the outer edge of each shank along the side surface of the arch portion of the upper midsole and attached.

Although the shape of the winding portion is not particularly limited, the shank portion has an outer shape that is substantially bowed from a front end of an outer edge to a rear end of an outer edge of the shank portion. Those having a three-dimensional shape along the shape are preferable.

Furthermore, it is also possible to provide a concave portion or a convex portion in the longitudinal direction in each of the shank portions and the winding portions to further reinforce the rigidity. The depth of the concave portions or the height of the convex portions is not particularly limited, but is preferably about 2 to 3 mm.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a shoe sole structure according to the present invention will be described.
This will be described with reference to the drawings. The sole structure shown in FIGS. 1 and 2 is mainly used for running shoes.
As can be seen from the side view of FIG. 2, the shoe sole structure according to this embodiment has an outsole 6, a lower midsole 4,
The plate 1 and the upper midsole 5 considerably, the arch portion comprises an upper midsole 5, shank portions 2 and 3 extending from the plate 1, and a winding portion 7 raised from the shank portion, and the forefoot portion is an upper portion. Midsole 5
And an outsole 6.

The outsole 6 used for the heel portion and the forefoot portion in the present embodiment is made of a solid rubber material having high wear resistance and anti-slip properties. Projections, ridges, grooves, and the like for improving the quality.

The upper and lower mid soles 2 in this embodiment
3 is made of a flexible and elastic EVA sponge material,
The hardness of the upper and lower layers is the same and the ASKER C hardness is 5
About 5 to 60 degrees is preferable. However, it is also possible to make the hardness of the midsole different between the upper and lower sides. Further, the lower midsole 4 of the heel portion in the present embodiment.
A notch 9 is formed largely from the front of the heel to the vicinity of the center of the heel, and the plate 1 forms a beam structure to improve the cushioning property in combination with the action of dispersing impact, and to improve the overall shoe sole. The weight has been reduced.

In this embodiment, the wave-shaped plate 1,
The shank portions 2, 3 and the winding portion 7 are made of a relatively hard and highly elastic polyurethane resin, and are integrally formed in advance. As shown in FIG. 3, the shape of the plate 1 is such that the wavelength on the inner side is longer and the wavelength on the outer side is shorter in the heel region of the sole structure, and the corresponding peaks and valleys and valleys and valleys are respectively formed. When they are connected, waves are arranged in a fan shape that opens around the outer shell side. By being formed in this manner, when the shoe lands sequentially from the heel portion to the toe portion, the weight movement path (load path) on the shoe bottom and the traveling direction of the wavy shape of the plate 1 substantially match. The heel can be flexibly deformed in response to weight shift while ensuring both cushioning and stability at the time of landing on the heel, thereby ensuring smooth weight shift and reliable grip. Further, as shown in FIG. 4, it is also possible to adopt a shape in which the waveforms are arranged substantially in parallel from the rear end of the heel toward the arch. From the front end of the plate 1 to the inner and outer shells of the arch,
And is extended to the forefoot part integrally with the plate 1.
In particular, as shown in the present embodiment, in a shoe sole structure in which the lower midsole 4 is not provided in the arch portion, the shank portions 2 and 3 are formed integrally with the plate 1 disposed on the heel portion. It is possible to extremely effectively suppress the drop and the twist of the portion.

In this embodiment, as shown in FIG. 2, when the plate is clamped between the upper and lower mid soles 4, 5, the interface between the upper mid sole 5 and the plate 1 and the lower mid sole 4 At the interface of the plate 1, a substantially elliptical through-hole was provided as a gap portion 10 from the side surface of the midsole along the corrugated ridge line or valley line of the plate.
The gap portion 10 has a function of improving the cushioning property by being compressed and deformed so as to be crushed by a load at the time of landing on the heel portion, and also contributes to weight reduction of the shoe.

Further, in this embodiment, FIGS.
As shown in FIG. 5 which is an end view of the XX line of FIG. A winding portion 7 having an outer shape that is substantially arcuately raised along the side surface of the arch portion of the upper midsole 5 is formed and attached. The shank portions 2 and 3 have a depth of about 2 to 2 in the longitudinal direction.
A 3 mm recess 8 was provided to further reinforce the rigidity.

[0034]

The shoe sole structure according to the present invention has the following effects. That is, the present invention, by arranging a wave-shaped plate on the heel portion, prevents a lateral displacement (pronation) at the time of landing and at the same time realizes a cushioning property, and corresponds to a so-called inner and outer vertical arch portion of the arch portion. By providing a shank part integrally with the plate in the part, excessive torsion of the arch part is suppressed, and appropriate "flexibility", "rebound", "stability" of the arch part is realized and "Lightening" can be realized.

Further, by forming a roll-up portion along the side wall of the midsole at the outer peripheral edge of the shank portion, and further providing a concave portion or a convex portion in the roll-up portion, the "repulsion" of the arch portion is improved. This will help prevent falls and improve the “stability” of the arch.

As described above, the shoe sole structure according to the present invention comprises:
The flexible midsole balances cushioning and stability of the heel, and is lightweight and prevents (excessive) twisting between the heel and the arch and the fall of the arch, allowing the heel to land on the forefoot. It enables smooth load (weight) movement, contributes to improvement of running ability, and has the effect of preventing obstacles to the feet.

[Brief description of the drawings]

FIG. 1 is a plan view of a shoe sole structure according to the present invention.

FIG. 2 is a side view of a shoe sole structure according to the present invention.

FIG. 3 is a plan view of a plate according to an embodiment of the present invention.

FIG. 4 is a plan view of a plate according to an embodiment of the present invention.

FIG. 5 is an end view taken along the line XX in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate 2 Outer-side shank part 3 Inner-side shank part 4 Lower midsole 5 Upper midsole 6 Outsole 7 Winding part 8 Depression 9 Notch 10 Gap

Claims (8)

[Claims] A heel portion comprises an outsole and an upper and lower midsole, and a corrugated plate made of a material harder than the midsole portion is tightly fitted between the two midsoles. A sole structure wherein the inner and outer insteps of the arch are extended from the front end to the forefoot as shank portions. 2. A heel portion comprising an outsole and a two-layer upper and lower midsole, and a corrugated plate made of a material harder than the midsole portion is narrowly fitted between the two midsoles. A shoe sole structure characterized by extending the inner side of the arch from the front end to the forefoot as a shank. 3. A heel portion is composed of an outsole and two upper and lower mid soles, and a corrugated plate made of a material harder than the mid sole portion is tightly fitted between the two mid soles. A shoe sole structure characterized by extending from the front end to the forefoot part with the outer side of the arch part as a shank part. 4. In the shoe sole structure, both the inner and outer shank portions are arranged on an arch portion of a midsole, and the outer edge of the outer shank portion and the outer edge of the inner shank portion are formed. The shoe sole structure according to claim 1, wherein a winding portion is formed along the side surface of the arch portion of the midsole and attached. 5. In the shoe sole structure, the inner shank portion is disposed on an arch portion of a midsole, and an outer edge of the inner shank portion extends along a side surface of the arch portion of the midsole. 3. The shoe sole structure according to claim 2, wherein the rolled-up portion is formed and attached. 6. The sole structure, wherein the outer shank portion is disposed on an arch portion of a midsole, and an outer edge of the outer shank portion extends along a side surface of the arch portion of the midsole. 4. The shoe sole structure according to claim 3, wherein the rolled-up portion is formed and attached. 7. The shoe sole structure according to claim 1, wherein the ground surface of the shank portion is reinforced by providing a concave portion or a convex portion in a longitudinal direction. 8. The shoe sole structure according to claim 1, wherein the winding portion of the shank portion is reinforced by providing a concave portion or a convex portion in a longitudinal direction.