JPH05329005A - Multi-hardness sole - Google Patents

Abstract

PURPOSE:To provide combined various functions of gripping performance, flexure, shock absorptivity, balancing performance, wear resistance and the like by providing a sole element including two elements which have a difference in hardness of a specified value. CONSTITUTION:A sole element includes two elements which have a difference of 5 deg. to 35 deg. in hardness based on spring type hardness tester A type in JISK6301. That is, the sole element 11 is formed of a little harder material M having a hardness of 75 deg. for example, and comprises a rear half of an outside part and a circular part of the hallux root of the toe part of the sole 1. The sole element 12 is formed of a hard material H having a hardness of 85 deg. and comprises the rear half of an inside part. Further, the sole element 13 is formed of a soft material S having a hardness of 65 deg. and comprises a front half of the sole 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-hardness sole capable of exhibiting optimal wearing feeling and running / walking functions depending on the type and use of shoes.

[0002]

BACKGROUND ART In recent years, injection molding technology has rapidly advanced, and shoes which are easy to wear and less tired have come into widespread use in the market. By injection molding, it is possible to manufacture a shoe having excellent characteristics as compared with a shoe manufactured by another manufacturing method, for example, the foot contact surface shape of the shoe sole can be molded into a shape close to the sole shape. ..

However, even in the case of a shoe manufactured by injection molding, it cannot be said that the consumer is functionally satisfied, as will be described below. That is, the functions required for shoes differ according to various uses such as general walking, running, indoor ball games, and outdoor ball games. Therefore, in order to meet consumer demands such as improved ease of wearing, the shoe configuration (particularly the shoe sole configuration) must be changed according to the type of the shoe and the intended use.

Conventionally, the foot contact surface of the shoe sole is limited to a specific shape, the material on the foot contact surface side of the shoe sole is limited to a specific material, and the unevenness of the shoe sole design is changed. By using a special material for the entire shoe sole,
There is provided a shoe which is suitable for various different uses and which is easy to wear and is less likely to be tired.

However, the sole has a grip, flexibility,
Although various functions such as shock absorption, balance, abrasion resistance, etc. are required in combination depending on the intended use of shoes, the shape and material of the foot contact surface of the above-mentioned shoe sole should be selected, or The conventional injection-molded shoes have not always been able to meet the demands of consumers for more comfortable wearing because only consideration is given to changes in the unevenness of the shoe sole design.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-hardness shoe sole capable of exhibiting a comfortable wearing feel and running / walking functions depending on the type and application. In addition, in recent years, shoes having a multicolor sole formed of a plurality of types of materials have been provided,
Multicoloring in this case is made from the viewpoint of fashionability, and is not made from the technical viewpoint of giving a specific function to the sole.

[0007]

SUMMARY OF THE INVENTION A multi-hardness sole according to the present invention is an injection-molded sole having two or more sole elements having different hardnesses exposed on a ground contact surface.
The difference in hardness (hereinafter simply referred to as “hardness”) based on the spring type hardness tester A type of K6301 is 5 degrees or more and 35 or more.
It is characterized by comprising two elements that are less than or equal to degrees.

The shoe sole of the present invention has a plurality of times (usually 2 to 6 times).
It is manufactured through a single injection process. Two of the injection materials used in these injections are those having a hardness difference of 5 degrees or more and 35 degrees or less after molding.
As a result, two or more shoe sole elements having different hardnesses are exposed and formed on the ground contact surface. If the hardness difference between the shoe sole elements is too small, the composite function depending on the type and application described later cannot be sufficiently exerted, and if it is too large, the running function is impaired. Therefore, in the present invention, the difference in hardness between the two elements of each shoe sole element is set to 5 degrees or more and 35 degrees or less.

When the shoe sole is molded by three or more injections, it is not necessary to use an injection material having a different hardness after molding for each injection, and the hardness difference after molding is 5 degrees or more. It suffices if at least two types of injection materials are used. For example, in the case of three injections, the injection material in the second injection is different from the injection material in the first injection, and even if the injection material in the third injection is the same as the injection material in the first injection, If the injection materials for the second (or third) and second injections are different, it is possible to manufacture a shoe having the sole of the present invention.

The shoe sole thus manufactured is
Usually, all of the sole elements forming the sole are manufactured so as to satisfy the requirement that the hardness difference between them is 5 degrees or more and 35 degrees or less. However, as long as at least two of the shoe sole elements satisfy the requirement, even if the shoe sole is formed with an extremely small hardness difference or a large hardness difference, these shoe soles can be formed according to the present invention. Needless to say, it is included in the technical scope of.

In the shoe sole according to the present invention, what kind of application the shoe is to be used depends on which part of the shoe sole is exposed, which sole element has what hardness, and the like. Is determined, or what function it has. Normally, the placement and hardness of each shoe sole element depends on which part of the ground contact surface is to have functions such as grip, flexibility, shock absorption, lateral shake prevention and balance, and wear resistance. Determined.

Since clip properties, shock absorption properties, etc. are affected by physical properties other than the hardness of the sole element, a universal relationship between these properties and hardness cannot be uniformly defined, but in general, shoes When a soft material having a hardness of about 50 to 65 ° is used as the sole element, the flexibility and grip of the shoe sole portion having the element tend to be good, and the hardness is 60 to 75.
When a material having a hardness of about 0 ° is used, the impact absorbing effect tends to be large, and when a material having a hardness of about 70 to 85 ° is used, stability is improved and lateral shake tends to be prevented. Usually, for the sole of heavy duty shoes such as trekking shoes, a portion of a hard material is often used for the purpose of preventing lateral shake, and shock absorption and cushioning properties of jogging shoes are emphasized. A portion of a slightly hard material is often used for the sole of the shoe, and a soft material is often used for the sole of the shoe such as tennis shoes and indoor ball games which needs flexibility and grip.

In designing the multi-hardness sole of the present invention,
It can be determined by referring to the locus of movement of the load point (the point where the load applied to the sole is the maximum) and the magnitude of the load at the load point when running or walking. In the shoe sole of the present invention designed in this way, the flexion / grip function, the shock absorbing function, the lateral blur preventing function, and the like are exhibited in combination depending on the type and application of the shoe.

[0014]

1 is a view showing an embodiment in which the shoe sole of the present invention is applied to a shoe suitable for normal running and walking. (A) and (B) of the figure are diagrams showing the movement loci of the load points on the soles of the feet during running and walking, in which a relatively large load is indicated by a solid line and a relatively small load is indicated by a broken line. There is. 2A and 2B are graphs showing the relationship between the load (body weight) applied to the sole of the shoe during running and walking and time.

When traveling, as shown in FIG.
The load suddenly increases at the landing point L _RUN , reaches the first peak of the load (see P _{RUN1 in} FIG. 2A), and then gradually decreases as the load point moves, and the kicking point K _{RUN point}
And increase again. Then, the load reaches the second peak (see _{PRUN2 in} FIG. 2A), and then rapidly _decreases . At the points L _RUN and K _RUN where the load increases, it is necessary to have a large impact absorbing effect, and relatively high stability is required from the time of touching down to the time of kicking. Further, when kicking out, it is necessary to smoothly bend the toe portion T, and the toe portion T is required to have high grip performance.

When walking, as shown in FIG.
The load gradually increases at the landing point L _WLK (almost the same point as L _RUN ), and the first peak of the load (P in FIG. 2B).
After reaching _WLK1 ), the load point slightly decreases and then increases again at the kicking point K _WLK . Then, the load is the second peak (P _{WLK2 in} FIG. 2B).
(See), and then gradually decays. Even during walking, an appropriate shock absorbing effect and flexibility and grip of the toe portion T are required.

3 (A) and 3 (B) are concrete design examples of the shoe sole based on the above knowledge, (A) is a bottom view of the shoe sole, and (B) is the same figure. FIG. Hereinafter, a hard material is represented by H, a slightly hard material is represented by M, and a soft material is represented by S, and hardness based on JIS K6301 spring type hardness tester A type is shown in parentheses. In the present embodiment, expressions such as hard material, slightly hard material, and soft material indicate relative hardness, and do not mean absolute hardness value. In the present design example, the shoe sole elements constituting the shoe sole 1 are constituted by 11 to 13. The sole element 11 is made of a slightly hard material M (75
°) and is composed of the rear half of the outer side of the shoe sole 1 (from the heel to some distance before the base of the fourth and fifth fingers) and the circular part of the base of the first finger at the toe. The shoe sole element 12 is made of a hard material H (85 °) and is composed of the rear half of the inner portion of the shoe sole 1 (the portion extending from the heel to the stepped portion). Furthermore, the sole element 13 is made of a soft material S (65
°) and is composed of the front half of the shoe sole 1 (excluding the circular portion formed of the slightly hard material M).

In the present invention, the thickness of each sole element can be changed according to the use and function of the shoe. Further, as shown by PL1 and PL2 in FIG. 3 (B), by partially laminating each shoe sole element, the joining of each shoe sole element becomes strong, and the size of the laminated portion and the laminated portion By appropriately changing the thickness ratio of the sole element, it is possible to optimally design the functions of the laminated portion (various functions such as a lateral shake prevention function, a shock absorbing function, a grip function, etc.).

4 (A) and 4 (B) are views showing another design example of the present invention. FIG. 4 (A) is a bottom view of the shoe sole 2, and FIG. 4 (B) is a vertical view of the heel of the shoe sole 2. It is a sectional view (BB 'sectional view).
In this design example, as shown in FIG. 1A, the shoe sole 2 is composed of the shoe sole elements 21 to 23, and the shoe sole element 21 is formed of a slightly hard material M (75 °). It is composed of the rear half of the outer side portion, a portion extending from that portion to the vicinity of the inner stepless portion, and the circular portion of the first finger root. Shoe sole element 2
2 is made of a hard material H (85 °) and consists of the back half of the inner side of the sole 2. The sole element 23 is made of a soft material S (65 °) and consists of the front half of the sole 2 (excluding the part made of the slightly hard material M).

As shown in FIG. 2B, the upper sole 2'formed between the cover 100 and the shoe sole 2 is made of a softer material than the above-mentioned soft material as shown in FIG. 2B. It is made of, and the wearability is further improved. In the above design example, the material S in which the front half of the shoe sole 2 is soft
Since the rear half is made of the hard material H or the slightly hard material M, lateral shake is prevented and the grip effect is enhanced. .. A shoe using such a shoe sole 2 is used for general running and walking.

FIGS. 5A, 5B and 6A-
(C) shows another design example of the present invention. Figure 5
In the shoe sole 3 of (A), the inner portion of the shoe (including the center of the heel) extending from the vicinity of the non-step portion formed of the shoe sole element 32 to the rear half is formed by the hard shoe sole element H (75 °), and The outer half of the shoe (excluding the center of the heel), the toe part, and the circular part of the base of the first finger and the outer peripheral part of the shoe sole that hang from the vicinity of the non-step including the non-step of the sole element 31 to the back half. Made of a slightly hard material M (65 °), the sole element 33
The other part made of is formed of the soft material S (55 °). The shoe having the shoe sole 3 has a hard heel and a toe (particularly the heel is hard) and has no lateral blurring, so that it is suitable for long-distance walking, for example.

The sole 4 shown in FIG. 5B is formed by the sole element 41, which extends from the vicinity of the stepless portion to the rear half (excluding the vicinity of the center of the heel), the toe portion, and the circular portion of the base of the first finger. Is formed of a slightly hard material M (65 °), and the other portion (including the outer periphery of the shoe sole) of the shoe sole element 43 is formed of a soft material S (55 °). In the shoe having the sole 4, the heel part (excluding the vicinity of the center of the heel) and the toe part are hard, and the vicinity of the center of the heel is soft. Since this shoe sole has many soft shoe sole elements, it has excellent grip properties, and is suitable for medium- to long-distance running, for example.

The sole 5 shown in FIG. 6 (A) is composed of four kinds of sole elements 5.
1, 51 ′, 52, 53, the circular part of the base of the first finger composed of the sole element 53 and the material S (50 °) having a soft heel center portion and the stepped portion composed of the sole element 52 and Due to the material H (65 °) having a hard outer periphery, the material M having a slightly harder remaining portion composed of the sole elements 51, 51 '
(55 °) and M '(60 °). The shoe sole 5 of this design example has a relatively large number of soft shoe sole elements, and thus has a high impact absorbing effect on the heel portion and the first finger root, and is suitable for, for example, an outdoor ball game (tennis or the like).

The sole 6 shown in FIG. 6B is made of a material S (50) having a soft outer portion of the base of the first finger consisting of the sole element 63 and the outside of the toe portion and the center of the heel. The hard material H (65
°), the remaining parts of the sole element 61 are each made of a slightly hard material M (60 °). The shoe sole 6 of this design example has many soft shoe sole elements, and in particular, the impact absorption effect of the toe portion, the heel portion, and the first finger root is high, and therefore, the shoe sole 6 is suitable for marathon and indoor ball games, for example.

The shoe sole 7 of FIG. 6C is made of a material H (65 °) having a hard outer portion of the base of the first finger consisting of the sole element 72 and the outside of the toe portion, the heel portion, and the stepless portion. And the rest of the sole element 71 is made of a slightly hard material M (60 °). The shoe sole 7 of the present design example has many hard shoe sole elements, and the entire sole does not easily cause lateral blurring, so that it is suitable for long-distance walking or trekking, for example.

Further, in the present invention, the shape of the shoe sole is shown in FIG.
By making it flat as shown in FIG. 5, a so-called flare effect can be provided, and by making it convex as shown in FIG. 6B, a suction effect can be provided. For example, when the shoe sole 6 having many soft shoe sole elements as shown in FIG. 6 (B) is formed into the shape shown in FIG. 7 (A), the flare effect is synergized, resulting in excellent shock absorption and grip. A high shoe sole is realized. Also,
As shown in FIG. 6C, the shoe sole 7 having many hard sole elements is shown in FIG.
In the case of the shape (B), a suction effect (a spring effect as shown by an arrow in FIG. 7B) is synergized to realize a shoe in which lateral shake is unlikely to occur and a shock absorbing effect is high.

The flare effect and the suction effect can be provided over the entire surface of the shoe sole by making the entire grounding surface flat or concave, or by making a part of the grounding surface flat or concave. It can also be given to a part of the sole with.

Further, according to the present invention, the sole element made of the foam material and the sole element made of the non-foam material can be mixed in the sole. Generally, when a foam material is used for the sole element, the hardness is slightly lowered, and the effect of the lowered hardness can be obtained. As a result, it is possible to efficiently manufacture a shoe having shoe soles having different hardness for each shoe sole element by injecting materials having the same chemical composition separately for foaming and non-foaming. Although the present invention has no direct relationship between the color of each shoe sole element and the hardness, it does not prevent different color for each shoe sole element.

[0029]

As described above, according to the present invention, two or more shoe sole elements having different hardness are formed so as to be exposed on the ground contact surface, so that the unevenness of the shoe sole design can be changed or the entire sole can be changed. By using a special material as the material that composes, compared to conventional soles that are intended to be adapted to various uses, grip, flexibility, shock absorption, balance, and
It is now possible to provide multi-hardness soles that have various functions such as abrasion resistance. Further, the shoe sole of the present invention meets the above-mentioned requirements by changing the hardness of the injection material, so that it can be manufactured using the existing injection molding equipment, and the manufacturing cost does not increase, and the manufacturing cost is low. It has become possible to provide shoes with excellent wearability and running / walking functions at a price.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for designing a shoe sole according to the present invention, and (A) and (B) are diagrams showing movement loci of load points on the sole of the foot during running and walking.

FIG. 2 is a graph showing a method for designing a shoe sole of the present invention, and (A) and (B) are graphs showing the relationship between the magnitude of the load applied to the shoe sole during running and walking and time. is there.

FIG. 3 is a view showing a design example of the present invention, (A) is a bottom view of a shoe sole, and (B) is a sectional view taken along the line AA ′ in the same figure.

FIG. 4 is a view showing another design example of the present invention, in which (A) is a portion formed of a hard material H, and a portion occupying the latter half of the outer side portion of the shoe sole is the first to third fingers. FIG. 3B is a bottom view of the shoe sole showing a case where it is extended to the base part of the shoe, and FIG.

FIG. 5 is a view showing still another design example of the present invention ((A),
(B)).

FIG. 6 is a view showing still another design example of the present invention ((A) to FIG.
(C)).

FIG. 7 (A) is a diagram showing an embodiment in which the shoe sole of the present invention has a flare effect, and FIG. 7 (B) is a diagram showing an embodiment in which a suction effect is also given.

[Explanation of symbols]

 1 to 7 soles

Claims (1)

[Claims] 1. An injection-molded shoe sole, wherein two or more shoe sole elements having different hardness are formed so as to be exposed at a ground contact surface, and these shoe sole elements JIS K6301 spring type hardness tester A type. Based on the difference in hardness is 5 degrees or more and 35
A multi-hardness shoe sole, characterized in that it comprises two elements that are sub-degrees.