JP2020074859A - Anti-slip shoes bottom and anti-slip shoes - Google Patents

Abstract

To provide an anti-slip shoes bottom that further reduces a wearer's burden and improves comfort in the wearing while anti-slip performance is maintained, and provide anti-slip shoes using the same.SOLUTION: An anti-slip shoes bottom 10 comprises a mid-sole 20 bonded to a shoe sole surface, and an outsole 30 bonded to a bottom surface of the mid-sole and having multiple block designs. The mid-sole comprises a foamed body softer than the outsole. In the foamed body, a repulsion rate being a ratio of rebound height when a steel ball of 16 mm in diameter and 16.5 g in weight is dropped on the foamed body of 25 mm in thickness is 50% or more. The block design has the side having a smooth tip surface and becoming a substantially vertical surface to the tip surface, and the inclination to the lateral vertical plane is 0-3 degrees.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a slip resistant sole used for a sole of a safety shoe or the like and suppressing slippage due to water, oil, etc., and a slip resistant shoe provided with the sole.

  Conventionally, for example, in kitchens of restaurants, etc., water, oil, etc. are often attached to the floor surface to make it slippery. Therefore, as work shoes used in such a place, slip-resistant soles that prevent slippage due to water, oil, or the like, that is, those that use slip-resistant soles with high slip resistance are used.

  As a structure for improving the slip resistance, for example, the hardness of the shoe sole grounding portion is specified, and the shape of the block design provided on the shoe sole grounding portion, for example, the height and the gradient are defined and There is a type in which the thickness of the thinnest part of the bottom is specified so that the block design has strength such that it does not easily collapse and falls over (for example, see Patent Document 1). In addition, as another structure, for example, a two-layer sole including a shoe sole ground portion (outsole) having a plurality of block designs of a predetermined shape and an insole or a midsole having hardness equal to or higher than that of the outsole is used. There is one (for example, refer to Patent Document 2). With the shoe sole having such a structure, the slip resistance can be improved.

  However, the slip-resistant sole having such a structure has a problem that it is uncomfortable to wear as a work shoe because the rigidity of the entire sole is relatively high. Further, if the shoe ground contact portion and the like constituting the anti-slip sole are formed of a material having a relatively low hardness, the rigidity of the entire shoe sole is reduced and a comfortable work shoe can be manufactured, but it is sufficient. There are problems that slip resistance cannot be obtained and durability is significantly reduced.

  Therefore, the midsole is made of a softer material than the outsole to improve the wearing comfort, and the height is gradually reduced toward the outside at least on the side of the block design on the base end side of the side in the front-rear direction of the shoe. It has been proposed to provide a slip-resistant shoe sole that maintains slip resistance by providing a reinforcing portion that overhangs (see Patent Document 3).

  However, if the structure of Patent Document 3 is adopted, it is possible to achieve both improved comfort and securement of slip resistance, but further improvement of comfort, reduction of burden when worn for a long time, and further improvement of comfort are required. Has been.

Japanese Patent No. 3451205 Patent No. 3553041 Japanese Patent No. 4721261

  In view of the above-mentioned circumstances, the present invention has an object to provide a slip resistant sole and a slip resistant shoe using the same for further reducing the burden and improving the comfort of the wearer while maintaining the slip resistance. ..

  The present invention for solving the above-mentioned problems is a slip resistant sole comprising: a midsole joined to a bottom surface of a shoe; and an outsole joined to a bottom surface of the midsole and having a plurality of block designs. The midsole is made of a softer foam than the outsole, and the foam has a resilience ratio which is a ratio of a bounce height when a steel ball having a diameter of 16 mm and a weight of 16.5 g is dropped on a foam having a thickness of 25 mm. Is 50% or more, and the block design has a side surface having a smooth front end surface and being a surface substantially perpendicular to the front end surface, and the inclination of the side surface with respect to the vertical surface is 0 to 3 degrees. It has a slip resistant sole characterized by being.

  In such an aspect of the present invention, the midsole is made of a foam that is softer than the outsole, and the foam has a high impact resilience with a restitution rate of 50% or more. It is possible to provide a slip resistant sole that prevents the user from falling down and further reduces the burden on the wearer and improves comfort.

  Here, the Asker C hardness of the foam is preferably in the range of 40 to 60 degrees.

  Further, it is preferable that the tip end surface of the block design is formed of at least one selected from a polygonal shape, a circle, an ellipse, and a linear shape or a bent strip shape.

  Further, it is preferable that an outer edge of the front end surface of the block design is inclined with respect to the front-rear direction and the left-right direction of the shoe sole.

  Further, the tip end surface of the block design is arranged continuously or intermittently so as to form at least one shape pattern selected from a rhombus, a parallelogram, a triangle and a V shape, and the shape pattern. It is preferable that at least one of the strip patterns is formed.

  Further, it is preferable that the array pattern of the block design is arranged such that the V-shaped pattern or the band-shaped pattern has a shape similar to a rhombus or a parallelogram.

  Further, the array pattern of the block design, the block design in which the triangular shape pattern or the strip-shaped pattern is arranged in a triangle is arranged inside the block design arranged to have a shape similar to the rhombus or the parallelogram. Preferably.

  Another aspect of the present invention is a slip resistant shoe including the slip resistant sole of the above aspect.

  As described above, in the present invention, the midsole is a foam that is softer than the outsole, and the foam has a high impact resilience of 50% or more. It is possible to provide a slip-resistant shoe sole that prevents the user from falling down even when not provided, and further reduces the burden on the wearer when wearing and improves comfort.

It is a bottom view of the slip resistant sole according to Embodiment 1 of the present invention. FIG. 2 is a sectional view taken along the line AA ′ of FIG. 1. FIG. 2 is a sectional view taken along line BB ′ of FIG. 1. It is sectional drawing explaining the inclination gradient of a block design.

  Hereinafter, the present invention will be described in detail based on embodiments.

(Embodiment 1)
1 is a bottom view of a slip resistant sole according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA ′ of FIG. 1, and FIG. 3 is a sectional view taken along the line BB ′ of FIG. FIG. 4 is a cross-sectional view illustrating the inclination gradient of the block design.

  As shown in FIGS. 1 and 2, a slip resistant sole 10 according to the present embodiment has a midsole 20 joined to a bottom surface of an upper (not shown) of a shoe, and an outsole joined to the midsole 20. It is composed of two layers of 30. The outsole 30 is formed of a material having a relatively high hardness such as polyurethane and rubber. The hardness of the outsole 30 is, for example, 54 degrees to 62 degrees (JIS-A, 20 ° C.).

  The midsole 20 is formed of a material softer than the outsole 30, and the material is not particularly limited. For example, a foam obtained by foaming a material such as rubber, elastomer, or plastic is preferably used as the material of the midsole 20. Be done. Specific examples include foamed polyurethane and foamed ethylene vinyl acetate (EVA). The hardness of the midsole 20 is, for example, 40 to 60 degrees (Asker C, 20 degrees).

  However, in the present invention, the midsole 20 has a high repulsion elasticity. Here, the high impact resilience means that the resilience is as high as 50% or more, preferably 60% or more. The repulsion rate is measured according to the method for measuring the repulsive force of JIS K6400. A sheet having a thickness of 25 mm, which is close to the actual midsole thickness (heel), is used, and a steel ball having a diameter of 16 mm (weight 16. 5 g) was taken as the bounce height (%) when dropped from a height of 500 mm.

  In the present invention, the midsole 20 is softer than the outsole 30 but has a high impact resilience, so that it is possible to further reduce the burden on the wearer and improve the comfort, and a block design 31 described later. The force exerted on the block design 31 is received with high repulsion to prevent the block design 31 from collapsing, and it is possible to maintain the slip resistance without providing a reinforcing portion for preventing the block design 31 from collapsing. Thereby, there is an effect that the weight of the outsole 30 can be reduced.

  The outsole 30 has a plurality of block designs 31 protruding on the side opposite to the midsole 20. The block design 31 is polygonal, circular, or the like, and the design height, design gradient, and minimum dimension (width) are related to each other, and the tip surface (top) serving as the ground contact surface of the block design 31 is flat ( It is better that there is no uneven pattern on the flat surface. The height of the block design 31 (for example, h in FIG. 3) needs to be 1 mm to 7 mm. If it is less than 1 mm, the design of the block is deformed by applying a load during wearing, and it is the same as a flat shoe sole without the design of the block, and there is no catching, so that it becomes slippery. On the other hand, if it exceeds 7 mm, the block design becomes too high and, on the contrary, it becomes unstable.

  The design gradient of the block design 31, that is, the inclination angle (θ in FIG. 4) of the side surface that is substantially perpendicular to the tip end surface with respect to the vertical surface is 0 ° to 3 °, preferably 0 ° to 2 °. It is preferably 0 to 1 degree. Although 0 degree is a right angle, it can be caught and the stopping property is improved. The inclination angle is somewhat required in consideration of ease of demolding at the time of molding, and can be up to 3 degrees, but it is preferable that the inclination angle be as small as possible for slip resistance. It should be noted that unlike the provision of the reinforced angle and the provision of the designed reinforcing portion, in the present invention, the reinforcing portion need not be provided as described above.

  The minimum dimension of the design pattern is, for example, the diameter of a circular block design, and the shortest distance between two opposing sides if it is a quadrangle. This minimum dimension needs to be 2 mm or more and 8 mm or less. If it is less than 2 mm, it will be easily deformed, so that it will not work well and slip resistance cannot be obtained. If it exceeds 8 mm, the contact area with the floor surface becomes too large, and it becomes the same as undesigned. The design pattern may be the entire surface of the floor or may be partial such as the central portion of the trampling or the heel portion. Since the shoe sole has a curved curve in the vertical and horizontal directions, the same effect can be obtained even if the sole is not the entire surface as long as the sole is in contact with the floor surface.

  In the structure of anti-slip sole, it is preferable that the block design 31 itself of the ground contact surface is supple and does not release while catching the floor surface. When a force is applied to the block design 31 from the vertical direction, the block design 31 needs to repel without being depressed and to transmit the force to the floor surface. Further, when a force is applied to the block design 31 from the lateral direction, it is necessary to continue to capture the floor surface even when the block design 31 does not deform and slides out.

  In the present invention, as described above, the midsole 20 is softer than the outsole 30, but has high resilience, so that the force applied to the block design 31 is received with high resilience to prevent the block design 31 from collapsing, The block design 31 can maintain the slip resistance.

  The block design of the present embodiment shown in FIG. 1 is designed so that the outer edge of the front end surface is inclined with respect to the front-back direction and the left-right direction of the shoe sole. One group of block designs is arranged in a lateral direction so that the upper sides of V-shaped strip-shaped patterns 311 face each other so as to form a rhombus shape, and two triangular patterns 312 are arranged inward to form a strip-shaped pattern. A gap 313 extending in the front-rear direction is provided between the pattern 311 and the triangular pattern 312.

  As a result, slip resistance can be obtained corresponding to the movement in the front, rear, left, and right directions.

  The method for producing the slip resistant sole of the present invention is not particularly limited, and injection molding, press molding or the like can be adopted, but in order to maintain the dimensional accuracy of the finished product at a high level, press molding is performed after premolding. Is preferred. That is, when the midsole 20 having high impact resilience is injection-molded, the dimensional accuracy tends to vary, but it is pre-molded to a slightly larger size to obtain, for example, a pre-molded product in a vulcanized state of about 80% to 90%. After that, press-molding is performed using a final molding die to finish, so that a slip resistant sole with high dimensional accuracy can be molded.

(Test example)
(Example 1)
The anti-skid sole having the structure shown in FIGS. 1 and 2 is a foamed EVA (ethylene vinyl acetate) having a rebound rate of 70% and an Asker C hardness of 55 degrees, and an outsole 30 is NBR compounded with JIS A hardness of 60. It was manufactured using rubber, and the coefficient of dynamic friction was measured as the slip resistance. The results are shown in Table 1.

The measurement of the dynamic friction coefficient was performed based on the slip resistance test method of JIS T8101.
The repulsion rate was measured according to the method for measuring repulsion force of JIS K6400. A 25 mm thick sheet of the foamed EVA used was used as the bounce height (%) when a steel ball having a diameter of 16 mm (weight: 16.5 g) was dropped from a height of 500 mm.

(Comparative Example 1)
The same procedure was performed as in Example 1 except that the midsole 20 was foamed EVA having an Asker C hardness of 70 degrees and a repulsion rate of 50%.

(Comparative example 2)
The same procedure as in Example 1 was performed except that the midsole 20 was foamed EVA having an Asker C hardness of 55 degrees and a repulsion rate of 40%.

As shown in Examples and Comparative Examples, the slip resistant soles of Examples were able to obtain high slip resistance by using a low hardness midsole having a high resilience rate.
In addition, because the midsole has high repulsion, the wearer's legs do not tire easily even after wearing for a long time, and the midsole is less likely to sink not only in the front-back direction but also in the left-right direction, so Problems such as spraining of the heel can be prevented.

10 Anti-slip sole 20 Midsole 30 Outsole 31 Block design

Claims (8)

A slip resistant sole comprising a midsole joined to the bottom surface of the shoe and an outsole joined to the bottom surface of the midsole and having a plurality of block designs,
The midsole is made of foam softer than the outsole,
The foam has a resilience rate of 50% or more, which is a ratio of a bounce height when a steel ball having a diameter of 16 mm and a weight of 16.5 g is dropped on a foam having a thickness of 25 mm.
The block design is characterized in that the tip surface has a side surface that is smooth and is substantially vertical to the tip surface, and the inclination of the side surface with respect to the vertical surface is 0 to 3 degrees. Anti-slip sole.   The slip resistant sole according to claim 1, wherein the foam has an Asker C hardness in a range of 40 degrees to 60 degrees.   The slip resistant sole according to claim 1 or 2, wherein the tip surface of the block design is formed of at least one selected from a polygonal shape, a circular shape, an elliptical shape, and a linear or bent strip shape. A slip resistant sole characterized by the following.   The slip resistant sole according to any one of claims 1 to 3, wherein an outer edge of the tip surface of the block design is inclined with respect to the front-rear direction and the left-right direction of the shoe sole. Anti-slip sole.   The slip resistant sole according to claim 4, wherein the tip surface of the block design is at least one shape pattern selected from a rhombus, a parallelogram, a triangle, and a V shape, and the shape pattern is continuous. Anti-slip sole, characterized in that it is formed with at least one of strip-shaped patterns arranged in a discontinuous or intermittent manner.   The slip resistant sole according to claim 5, wherein the array pattern of the block design is arranged such that the V-shaped pattern or the band-shaped pattern has a shape approximate to a rhombus or a parallelogram. Anti-slip soles characterized by.   7. The slip resistant sole according to claim 6, wherein the array pattern of the block design has the triangular shape pattern or the strip pattern inside the block design arranged to have a shape similar to the rhombus or the parallelogram. A slip resistant sole characterized by having block designs arranged in a triangle.   A slip resistant shoe, comprising the slip resistant sole according to any one of claims 1 to 7.

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