JP4721261B2 - Anti-slip sole - Google Patents

Description

  The present invention relates to a non-slip shoe sole that is used for a shoe sole such as a safety shoe and suppresses slippage due to, for example, water or oil.

  For example, in a restaurant kitchen or the like, water or oil or the like is often attached to the floor surface, making it easy to slip. For this reason, as work shoes used in such a place, those using anti-skid shoe soles that prevent slipping due to water, oil, etc., that is, those using anti-skid shoe soles with high slip resistance are used.

  As a structure for improving the slip resistance, for example, the hardness of the shoe sole grounding part is specified, and the shape of the block design provided on the shoe sole grounding part, for example, the height and the gradient, etc., and There is one in which the thickness of the thinnest portion of the shoe sole is defined so that these block designs are not easily depressed and are not easily collapsed (see, for example, Patent Document 1). Further, as another structure, for example, a two-layer bottom of a shoe sole grounding portion (outsole) having a plurality of block designs of a predetermined shape and an insole or midsole having a hardness equal to or greater than the outsole is used. There are some (see, for example, Patent Document 2). By making the shoe sole in such a structure, the slip resistance can be improved.

  However, the anti-skid shoe sole having such a structure has a problem that the overall comfort of the shoe sole becomes relatively high, so that the comfort of the work shoe is poor. In addition, if the sole contact portion or the like constituting the anti-skid sole is formed of a material having a relatively low hardness, the overall rigidity of the sole can be reduced and a comfortable working shoe can be produced. There arises a problem that the slip resistance cannot be obtained and a problem that the durability is greatly lowered.

Japanese Patent No. 3451205 (Claims) JP 2002-165607 A (Claims)

  In view of such circumstances, an object of the present invention is to provide a slip-resistant shoe sole capable of maintaining good slip resistance and durability and improving the comfort of work shoes.

A first aspect of the present invention that solves the above-described problem is a slip-resistant shoe sole comprising a midsole joined to the bottom of a shoe, and an outsole joined to the bottom of the midsole and having a plurality of block designs. Because
The midsole is made of a softer material than the outsole,
The block design is provided such that the front end surface is smooth and an angle is formed between the tip surface and the side surface, and the side surface is substantially perpendicular to the seating surface , and at least the block design On the base end side of the side surface in the front-rear direction of the shoe, a reinforcing portion that protrudes so that the height gradually decreases toward the outside is provided on the anti-skid shoe sole.

  In the first aspect, the rigidity of the entire shoe sole is lowered, but the rigidity of each block design is ensured. Therefore, the flexibility of the entire shoe sole can be improved while maintaining good slip resistance and durability.

  According to a second aspect of the present invention, there is provided the anti-skid shoe sole according to the first aspect, wherein the surface of the reinforcing portion is a flat surface.

  In the second aspect, the rigidity of the block design is reliably improved by the reinforcing portion.

  According to a third aspect of the present invention, in the first or second aspect, the height of the reinforcing part on the block design side is 20% or more and 50% or less of the height of the block design. It is on the slip-proof sole.

  In the third aspect, the durability of the block design can be ensured while ensuring the slip resistance.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, an inclination angle of the surface of the reinforcing portion with respect to the seating surface is 30 ° to 60 °.

  In the fourth aspect, the rigidity of the block design is reliably improved even if the height of the reinforcing portion is relatively low.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the thickness of the joint portion between the outsole and the midsole is thinner than the thickness of the midsole. It is in the sole.

  In the fifth aspect, the weight of the entire shoe sole can be reduced, and the flexibility of the entire shoe sole is improved.

  A sixth aspect of the present invention is the antiskid shoe sole according to any one of the first to fifth aspects, wherein the midsole is made of foamed rubber, foamed elastomer or foamed plastic.

In the sixth aspect, the weight of the entire shoe sole is reliably reduced, and the flexibility is also reliably improved. In the seventh aspect, an arcuate thick part along the toe part outer periphery and an arcuate thick part along the outer periphery of the toe part are formed on the toe part and the heel part of the outsole. A plurality of ground blocks having a tip surface similar to the block design are provided on the thick portion.

  As described above, in the present invention, the midsole is formed of a softer material than the outsole, and the reinforcing portion is provided on the base end side of the side face of the block design, so that the slip resistance is maintained well. Meanwhile, the flexibility of the entire shoe sole can be improved. Accordingly, it is possible to provide work shoes with less fatigue even when worn for a long time while preventing slipping on the floor surface to which oil, water or the like is adhered.

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

  FIG. 1 is a bottom view of an anti-skid shoe sole according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a schematic structure in the front-rear direction of the shoe, and a cross-sectional view taken along line AA ′ of FIG. FIG. 3 is an enlarged cross-sectional view of the block design. As shown in FIGS. 1 and 2, the anti-skid shoe sole 10 according to this embodiment includes a midsole 20 joined to the bottom surface of an upper (not shown) of the shoe, and an outsole 30 joined to the midsole 20. And two layers. The outsole 30 is formed of a material having relatively high hardness such as polyurethane or rubber. On the other hand, the midsole 20 is formed of a softer material than the outsole 30, and the material is not particularly limited. Examples thereof include rubber, elastomer, plastic, and the like. It is suitably used as a material for the sole 20. Specific examples include polyurethane foam and ethylene vinyl acetate (EVA).

  The outsole 30 has a plurality of block designs 31 protruding on the opposite side to the midsole 20. The thickness of the thinnest portion of the outsole 30 other than the block design 31 is preferably formed to be relatively thin so as to ensure the rigidity of the entire shoe sole, and at least thinner than the thickness of the midsole 20. Is desirable. For example, in the present embodiment, the thickness of the thinnest part is about 1.5 mm.

  As shown in FIG. 3, each block design 31 is formed so that the cross section thereof is rectangular in this embodiment. Of course, the shape of the block design 31 is not particularly limited, and the cross section may be, for example, a circle or a polygon. Moreover, the block design 31 is provided so that the side surface 31a may be a substantially vertical surface with respect to the seating surface. Further, a reinforcing portion 32 is provided on the base end side of the side surface of each block design 31.

  In such a block design 31, the tip side of the reinforcing portion 32 substantially acts as a slip stopper. In other words, the corner portions of the side surface 31a and the front end surface 31b of the block design 31 are hooked to the floor surface to prevent slipping. For this reason, the side surface 31a of the block design 31 is preferably a surface perpendicular (90 °) to the seating surface, but a substantially vertical surface, that is, an inclined surface of about 87 ° to 90 °. If it is, slipping can be effectively prevented.

  In the present embodiment, slits 33 having different directions are provided on the front end surface 31 b of each block design 31 in each adjacent block design 31. Thereby, since the catch with respect to a floor surface becomes still larger, a slip can be prevented more reliably.

  In addition, the reinforcing portion 32 provided on the base end side of the side surface 31a of the block design 31 is provided so as to protrude outward from the side surface 31a of the block design 31 so that the height gradually decreases toward the outside. For example, in the present embodiment, the reinforcing portion 32 is formed so that the surface thereof becomes an inclined surface (plane) inclined at a predetermined angle θ with respect to the seating surface 30a.

  Here, the height of the reinforcing portion 32, that is, the height h1 at the end of the reinforcing portion 32 on the block design 31 side is not particularly limited, and is appropriately determined in consideration of the size, shape, and the like of the block design 31. However, the height h2 of the block design 31 is preferably 20% or more and 50% or less. If the height h1 of the reinforcing portion 32 is too low, the rigidity of the block design 31 cannot be ensured and the slip resistance cannot be ensured satisfactorily. On the other hand, if the height h1 of the reinforcing portion 32 is too high, the rigidity of the block design 31 is ensured and good slip resistance can be obtained, but the length h3 of the portion acting as a slip stopper is shortened and the slip resistance is short. It will fall.

  The inclination angle θ with respect to the seating surface of the reinforcing portion 32 is not particularly limited, but is preferably about 30 ° to 60 °. For example, in this embodiment, the inclination angle θ is about 45 °. By setting the inclination angle θ to such an angle, the rigidity of the block design 31 can be reliably improved even if the height h1 of the reinforcing portion 32 is relatively low.

  In the present embodiment, the reinforcing portion 32 is formed so that the surface thereof is a flat surface inclined with respect to the seating surface 30a. However, the present invention is not limited to this, and the surface of the reinforcing portion 32 is, for example, FIG. As shown in FIG. 4, it may be R-shaped.

  Such a reinforcing part 32 may be provided in all the block designs 31, but for example, a part such as a front center part of a shoe that is most likely to be loaded when walking and has a great influence on slip resistance. It may be provided only in the block design. For example, in this embodiment, the reinforcement part 32 is provided in each block design 31 except the front-end | tip part (toe side edge part) and the rear-end part (edge side edge part) of shoes. Moreover, although the reinforcement part 32 should just be provided in the side surface of the front-back direction of each shoe of each block design 31, in this embodiment, it fundamentally reinforces continuously to all the side surfaces of each block design 31. A portion 32 is provided.

  By providing the reinforcing portion 32 on the base end side of the side surface 31a of each block design 31 in this way, the rigidity of the block design 31 is improved, so that comfort is greatly improved while ensuring good slip resistance and durability. Can be improved. That is, by reducing the thickness of the joint portion of the outsole 30 and increasing the thickness of the midsole 20 formed of a relatively soft material, the weight of the shoe sole can be greatly reduced and the entire shoe sole can be reduced. Flexibility is improved. Further, when the flexibility of the entire shoe sole is improved, the slip resistance is lowered when the rigidity of the block design 31 is lowered. However, in the present invention, the rigidity of the block design 31 is secured by the reinforcing portion 32. Therefore, the slip resistance is maintained well. Accordingly, it is possible to provide work shoes that are comfortable to wear with little fatigue even when worn for a long time while preventing slipping on the floor surface to which oil, water, or the like adheres.

  Here, Examples 1 to 3 in which the height h2 of the block design 31 is 6 mm, the inclination angle θ of the reinforcing portion 32 is constant 45 °, and the height h1 of the reinforcing portion 32 is changed as shown in Table 1 below, and The slip resistant soles of Comparative Example 1 were prepared, and the dynamic friction coefficient of the shoe soles of each Example and Comparative Example was measured by the slip resistance test method of the safety shoe technical guidelines (Industry Safety Institute, Ministry of Labor, March 1991). The results are also shown in Table 1.

  As is clear from this result, in the shoe soles of Examples 1 to 3 in which the reinforcing portion 32 is provided on the base end side of the side surface 31a of the block design 31, the shoe sole of Comparative Example 1 in which the reinforcing portion is not provided. It can also be seen that the coefficient of dynamic friction is high and the slip resistance is well maintained. If the dynamic friction coefficient is 0.3 or more, sufficient stability can be obtained in actual use.

  Next, specific examples of the present invention will be described. FIG. 5 is a specific design example of the anti-skid shoe sole in the anti-skid shoe having a shoe size of 25.5 cm. The anti-skid shoes have anti-skid shoe soles that exhibit extremely high anti-slip performance in places where water and oil are scattered on the floor surface and are easily slippery, such as izakayas, fast food shops, food processing factories, etc. Is.

  FIG. 5A is a bottom view of the anti-skid shoe sole 110 when the outsole 130 is viewed from the grounding surface side, and FIG. 5B is an end surface showing a cut end surface along the line AA ′ in FIG. FIG. The antiskid shoe sole 110 shown in FIG. 5 is designed for a foot size of 25.5 cm and has the same structure as the antiskid shoe sole 10. The size of the foot is assumed to be about 22 cm to 31 cm, and the overall length, width, area of the entire shoe sole, etc. vary proportionally according to the size of the foot, excluding the shape of the basic block described later. It is like that.

  As shown in FIG. 5 (a), the anti-skid shoe sole 110 is provided with an intermediate region 111 with few blocks in contact with the floor at the arch portion of the foot. It can be divided into a forefoot sole area 112 including a toe and a stepping portion and a heel side area 113 with 111 as a boundary. Further, the anti-skid sole 110 is formed by joining the outsole 130 and the midsole 120. In this embodiment, as shown in FIG. 5A, the outsole 130 is formed slightly smaller than the midsole 120, and is joined and configured so that the edge of the midsole 120 can be seen on the outer periphery of the outsole 130. ing. However, as shown in FIG. 5B, the edge is set not to contact the floor, in other words, only the outsole 130 is in contact with the floor. Further, as described above, foamed polyurethane, ethylene vinyl acetate (EVA), or the like that is softer than the outsole 130 is used for the midsole 120, and a material with relatively high hardness such as polyurethane or rubber is used for the outsole 130. .

  In this example, the thickest part of the outsole 130 (distance from the joint surface with the midsole 120 to the front end surface of the block: h2 in the above-described embodiment of the invention) is 6 mm, and the portion where no block is provided The thickness (thickness of the thinnest portion: h4 in the embodiment of the invention described above) is 1.5 mm to 2.0 mm.

  The midsole 120 is formed so as to gradually increase in thickness from the forefoot sole region 112 to the heel side region 113. The thickness TM1 of the forefoot sole region 112 is about 8.5 mm, and the thickness of the heel side region 113 is set. TM2 is about 19 mm. That is, with respect to the outsole 130 having the thickest part 6 mm and the thinnest part h4 of 1.5 mm to 2.0 mm, the thickness TM1 of the forefoot sole region 112 part is about 8.5 mm and the thickness of the heel region 113 The midsole 120 having a thickness TM2 of about 19 mm is joined.

  FIG. 6 is an explanatory diagram of a basic block BL0 that is a basic shape of a block arranged on the surface of the outsole 130. FIG. The basic block BL0 is provided in a plurality of rows in the center region extending in the front-rear direction of the front foot sole region 112 and the heel side region 113 constituting the shoe bottom so that the directions of the ground contact surfaces are staggered.

  The basic block BL0 has a substantially trapezoidal section (hereinafter referred to as “block base BLB”) having a quadrangular pyramid-like inclined surface corresponding to the reinforcing portion 32 described above, and is formed on the block base BLB. A block (hereinafter referred to as “grounding block SBL”) in contact with the floor surface is provided. The grounding block SBL is provided with two narrow grounding surfaces 115 (tip surfaces) by grooves 114 (slits) provided in the center.

  Since the thickness (h2) of the outsole 130 is 6 mm and the thickness (h4) of the thinnest portion of the outsole 130 is 1.5 mm to 2.0 mm, the basic block BL0 from the surface of the outsole 130 is obtained. The height is 4.5 mm to 4 mm. The height (h3) from the upper surface of the block base BLB to the ground surface 115 of the ground block SBL is 1.5 mm to 2 mm, and the block base BLB surrounded by the reinforcing portion 32 according to the dimensions. The height of the is adjusted. The depth of the groove 114 provided on the ground contact surface 115 is 1 mm to 1.5 mm. In this embodiment, the depth is set to 1.5 mm from an empirical viewpoint regarding slip resistance. The groove 114 is a square groove with a flat bottom surface and is not V-shaped. In the case of the V shape, the grounding block SBL provided with the grounding surface 115 is likely to fall outward, and a square groove is used to prevent this.

  In the present embodiment, the region surrounded by the bottom edge of the block base BLB having the quadrangular pyramid peripheral side surface is referred to as “block base base BBK” (region represented by width d2 and width w3 in FIG. 6). This block base base BBK is a square area of d2 × w3 = 12.75 mm × 12.75 mm.

  Further, the area SBK above the block base BLB (area represented by the width d1 and the width w2 in FIG. 6) serving as a boundary with the grounding block SBL has four corners chamfered with a radius R of d1 × w2 = 8. It is a square area of 82 mm × 8.82 mm.

  The grounding block SBL is a part having a height h3 having the outer shape of the block base BLB, but the surface to be in contact with the floor is equally divided into three square areas of d1 × w2 = 8.82 mm × 8.82 mm. Thus, by providing the groove 115 having a width of 2.94 mm, two rectangular grounding surfaces 115 having a width of 2.94 mm and a length of 8.82 mm are formed.

  The four corners (peripheral side surfaces) of the narrow ground surface 115 having a width of 2.94 mm and a length of 8.82 mm are rounded with a curvature having a radius R (0.74 mm). On the other hand, it is desirable that the angle between the outer peripheral edge and the peripheral side surface of the ground contact surface 115 serving as an edge is formed with a highly accurate right angle or an angle close to a right angle without roundness as much as possible. It is desirable to be small.

  That is, even if the midsole is softer than the outsole as in the invention of the present application, it is possible to set the block so that the block is not easily depressed and is not easily collapsed. In a situation where water or water is attached, oil or water is removed from the floor surface by the corners (edges) of the ground contact surface 115 during walking, and after removing the oil or water, the ground contact surface that is smooth and has a small surface roughness is removed. By pressing against the surface, the ground contact surface 115 and the floor surface are brought into contact with each other to prevent slippage.

  The anti-skid shoe sole according to the present embodiment has been found as a result of various experiments to find the shape of the basic block BL0. However, the basic block BL0 cannot be disposed as it is on both the left and right sides and the front and rear ends of the shoe bottom. There is. For this part, while considering not to lose as much as possible the slip-resistant elements (width, length, edge angle, smoothness and surface roughness, prevention of inclination of the grounding block by the block base BLB, etc.) of the basic block BL0, A grounding block having a deformed shape is formed. Further, the respective ground planes 115 are arranged such that the longitudinal directions are alternately alternated.

  FIG. 7A is an explanatory diagram centering on the grounding surface 115 which is the top of the grounding block. As shown in FIG. 7 (a), the anti-skid shoe sole is composed of two ground planes 115 which the basic block BL0 has in the three central rows of the forefoot sole 112 and the two central rows of the heel side region 113. And ground planes L1 to L24 and R1 to R25 provided on the left and right sides of the ground plane LR. In addition, the area | region of the dotted line described so that each grounding surface LR was enclosed represents the block base base BBK (equivalent to B1-B27 of FIG.7 (b)) of the base block which provided each grounding block.

  The ground contact surfaces other than the central three rows of the forefoot sole 112 and the central two rows of the heel side region 113 can be formed as a non-slip element having the basic block BL0 with a width of the ground contact surface of about 2.94 mm, and When the ground planes can be arranged at equal intervals, ground planes having the same width are provided at intervals of about 2.94 mm. It should be noted that the ground planes L1, L2, L5, L8, L11, L12, L20, L23, L24 or the ground planes R1, R2, R5, R8, R11, R12, R13, R16, R19, R22, R25 As a result of opening, when the width of the ground contact surface of about 2.94 mm cannot be taken, the ground contact surface having the width of 2.94 mm or more is provided according to the outer peripheral shape of the shoe bottom.

The total area of the contact surface shown in FIG. 7A is 48.4 cm ^{2 in} the case of the 25.5 cm anti-skid shoe sole according to the present embodiment (calculated from the design drawing). FIG. 7B is an explanatory diagram showing the block base base BBK (B1 to B27) of the base block provided with each grounding block. The base block B2 at the distal end is formed in a slightly arcuate region along the outer periphery of the toe, the thickness is about 4 mm, and the height of the grounding block provided on the base block B2 is about 2 mm. In addition, the base block B27 of the collar part is formed in a slightly arc-shaped region along the outer periphery of the collar part, the thickness is about 5 mm, and the height of the grounding block provided on the base block B27 is about 1 mm. It is. That is, the toe portion and the heel portion are formed thicker and wider than other blocks from the viewpoint of preventing the grounding block from falling down, wear resistance, and the like because the load applied during walking is larger than that of the flat portion.

The total area of the block base bases BBK (B1 to B27) of the base block shown in FIG. 7B is 147.4 cm ^{2 in} the case of the 25.5 cm anti-skid shoe sole according to the present embodiment (design). Calculated from the drawing).

As shown in the table of FIG. 8, in the case of the 25.5 cm anti-skid shoe sole according to this example, the total area of the entire sole (outsole total area) is about 190 cm ² and the total area of the block base is 147. .4 cm ² and the total area of the block ground contact surface is 48.4 cm ² . That is, the total area of the block base base with respect to the total area of the outsole is about 77.6%, and the total area of the block ground contact surface is about 25.4%. That is, by concentrating the load applied to the outsole in a small area of about 1/4 of the total area of the outsole, the load per unit area is increased and the best friction coefficient is obtained with respect to the floor surface. It is like that.

  Further, the ratio of the total area of the block ground contact surface to the total area of the block base base is 32.8%, and the block base base having an area about three times the unit area of the ground contact surface in contact with the floor is required. Recognize. In this way, the base having an area about three times as large as the ground contact surface prevents the block from falling over and deforming so as to be recessed toward the midsole, and effectively presses the ground contact surface against the floor surface. Be able to.

  The numerical values and ratios described above are derived from experiments using blocks having various shapes.

For reference, the design area of each part of the block base bases B1 to B27 is shown in the left column of FIG. The block base base B1 is a part serving as a base of the basic block BL0. The area of the block base base B1 is 156.1979 mm ² and is provided at 35 locations on the entire shoe sole.

  C1 to C27 in the right column of FIG. 9 are regions at the top of each of the block base bases B1 to B27, and represent a portion serving as a base of each grounding block. The areas of the regions C1 to C27 are as shown in the table.

FIG. 10 shows the contact surface areas of the contact surfaces LR, L1 to L24, and R1 to R25 shown in FIG. The area of the ground plane LR of the basic block BL0 is 25.4875 mm ² , and ^two ground planes LR are provided in the basic block BL0.

  FIG. 11 shows the measurement of the dynamic friction coefficient when the reinforcing portion having the inclination angle of 45 ° and the outsole (rubber) hardness of 60 ° is provided (Example) and when the reinforcing portion is not provided (Comparative Example). . From this result, the effect when the reinforcing portion is provided can be understood.

  FIG. 12 (a) shows the change in the coefficient of dynamic friction by changing the hardness of the midsole (EVA) while keeping the hardness of the outsole (rubber) constant, and FIG. 12 (b) shows the midsole (EVA). ), And the hardness of the outsole (rubber) was changed, and the coefficient of dynamic friction was measured. As shown in this result, in any case, an excellent dynamic friction coefficient was obtained without affecting the change in hardness.

It is a bottom view of the anti-skid shoe sole based on one Embodiment of this invention. It is sectional drawing of the anti-skid shoe sole which concerns on one Embodiment of this invention. It is an expanded sectional view of a block design concerning one embodiment of the present invention. It is an expanded sectional view showing other examples of block design concerning one embodiment of the present invention. It is the bottom view and the principal part end elevation of the anti-skid shoe sole concerning other examples of the present invention. It is explanatory drawing of the basic block of the anti-skid shoe sole based on the other Example of this invention. It is explanatory drawing for demonstrating the shape of the ground-contact surface of the anti-skid shoe sole based on the other Example of this invention. It is a table | surface of each area data of the anti-skid shoe sole based on the other Example of this invention. It is a table | surface of each area data of the anti-skid shoe sole based on the other Example of this invention. It is a table | surface of each area data of the anti-skid shoe sole based on the other Example of this invention. It is a table | surface showing the relationship between the presence or absence of the reinforcement part which concerns on the other Example of this invention, and a dynamic friction coefficient. It is a table | surface showing the relationship between the hardness of a slip-resistant shoe sole and the dynamic friction coefficient which concern on the other Example of this invention.

Explanation of symbols

10 Slip resistant sole 20 Midsole 30 Outsole 31 Block design 32 Reinforcement

Claims (1)

A safety shoe or work shoe for water or oil that adheres to the floor, comprising a midsole joined to the bottom of the shoe and an outsole joined to the bottom of the midsole and having a plurality of block designs A non-slip shoe sole, wherein the midsole is made of a material obtained by foaming rubber, elastomer or plastic that is softer than the outsole, and the outsole is a material that is relatively harder than the material of the midsole. The thickness of the thinnest part, which is a region other than the block design of the outsole, is formed to be at least thinner than the thickness of the midsole, and the block design has a smooth end surface and a side surface. An angle is formed between the side surface and the side surface of the block design is substantially perpendicular to the seat surface. The base end portion side in the longitudinal direction of the side surface of the shoe, the reinforcing portion from the side surface of said block design are provided to protrude such that the height toward the outside is gradually decreases, the height of the reinforcing portion A slip-resistant shoe sole characterized by being lower than the height of the block design .

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