JPH035A - Structure of slip preventing piece for sole and its manufacture - Google Patents

Abstract

PURPOSE:To prevent separation and invasion of water and to comfortably wear shoes by forming a slip preventing piece so as to extend the foot arch part to the toe part of a sole, and by forming the peripheral edge part of the sole in a V-like cross-sectional shape by which a tearing force is decayed. CONSTITUTION:A slip preventing piece 4 fitted in a recess 5 which is formed in a sole 1, extending from the toe part 2 to the foot arch part 3 of the sole 1, has a length of about 9cm for usual adult persons, and is positioned in a part where it makes contact with the earth underneath the foot sole so as to kick the earth. The slip preventing piece 4 has its peripheral edge part which is in a V-like cross-sectional shape 4a, having a depth 2 to 3mm, a width of 3 to 4mm and an rough angle theta of 30 to 45deg. This tough angle is preferably set to such a value that the depth of the rough is greater in view of the pressure cone apex, but it is desirably set to theta=30 deg.+ or -15deg. in view of a restriction on production. With this sliding piece, a tearing force effected in the boundary surface may be remarkably decayed, and accordingly, it is possible to prevent occurrence of a separation even tough expansion and contraction is exerted. Further, since it extends over the entire circumference, relaxation is effected in any direction even though any kind of forces is exerted thereto, and accordingly, the bonded surface may be protected. Further, the abovementioned V-like shape 4a is effective for increasing the area of the bonded surface, and accordingly, the separation may be surely prevented, and further, it has a long path so that invasion of water may be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an anti-slip piece made of elastic resin provided on a part of a shoe sole in order to eliminate the slipperiness of leather shoe soles.

(Prior art) Leather soles are extremely slippery when the entire sole is made of leather, and it is very dangerous to walk on stone or tile paving stones. A method has been adopted in which a recess is bored in the toe part and an elastic resin is cast into the recess to form an anti-slip piece.

For example, Utility Model No. 515-5045, in which an anti-slip piece and a leather sole plate are anchored with several pillar-shaped rubber rods, No. 58-18844, in which a notch is provided on the periphery a little apart from the anti-slip piece, and an anti-slip piece and a leather sole plate, Tokuko Sho 63, which was integrally molded by injection molding.
-12603 etc. are publicly known.

However, in these cases, the adhesive strength at the vertical boundary between the recessed part of the sole and the anti-slip piece is weak, so when the sole is expanded and contracted while walking, that force acts in the direction of separating the anti-slip piece from the recessed part. I end up. As a result, repeated wetting and drying through water weakens the adhesive strength, making the interface susceptible to peeling, leaving a serious drawback in that water can enter through the peeled areas and wet the interior.

(Problems to be Solved by the Present Invention) In view of the above-mentioned circumstances, the present invention provides a structure in which the anti-slip piece is difficult to peel off by reducing tearing force in the vertical direction to prevent water from entering, and also to simplify manufacturing thereof. The aim is to create a method that can be mass-produced.

(Means for Solving the Problems) The anti-slip piece of the sole of the present invention is a shoe sole in which a recess formed from the arch to the toe is filled with an elastic resin to form an anti-slip piece, and the periphery of the shoe sole has a tearing force. It is characterized in that it is formed in a horizontal V-shape that relaxes.

The manufacturing method uses a rotary blade that combines an inner blade with a horizontal V-shaped cross section, a lower blade for scraping the underfill, and a burr suppressing blade on the head to suppress the formation of burrs. A recess with a horizontal V-shape in cross section is drilled, the sole is placed in a mold, a liquid resin that maintains elasticity is injected through an injection port drilled on the back side of the recess, and the resin retains its elasticity after curing, and the mold is removed after the resin has hardened. It consists of

(Function) The anti-slip piece of the present invention has a horizontal V-shape, that is, slopes opposing each other in opposite directions are formed, so the tearing force is divided into a force parallel to the oblique side and a force perpendicular to the oblique side. The absolute value decreases, and the parallel forces have opposite directions, so they become centripetal forces toward the center of the V-shaped valley, and the perpendicular forces become back-to-back forces along the V-shaped valley line. As a result, the force acting on the interface is reduced by internal forces in opposite directions, and the tearing force is significantly attenuated.

Also, when manufacturing it, if the rotary blade is operated in a copying manner,
The inner blade scrapes the periphery in a horizontal V-shaped cross section, the lower blade scrapes the bottom flesh, the burr suppressing part suppresses the occurrence of burrs, and forms a recess having a slope with a horizontal V-shaped cross section. Mass production is easily possible by placing the bottom in a mold, injecting liquid resin from the injection port, and removing the mold after the resin has hardened.

(Example) To explain the example below, the first
In the figure, 1 is the sole body made of leather, 2 is the toe part, and 3 is the arch part.

4 is an anti-slip piece filled in a recess 5 formed between the toe part 2 and the arch part 3 of the sole 2, which is about 9 cm thick for a normal adult at the place where the sole of the foot contacts the soil and kicks the soil. Form into length.

The anti-slip piece 4 has a peripheral cross section shaped like a horizontal V-shape 4&, and its size is, for example, 2-3 mm in depth and 3-4 mm in width.
Let the valley angle θ be 30-45 degrees. The angle of this valley is
It is preferable to make it deeper from the point of view of action, but from the manufacturing point of view, θ
: It is desirable to set it to about 304 soil 15.

The bottom surface of the anti-slip piece should be horizontal, and if it has good adhesion to the sole body l, it may be left as is, but an adhesive may be applied to it to make it more integrated.

An injection port 6 for resin injection is provided at the back surface of the recess 5.

Next, the manufacturing method will be explained. First, a rotary blade K for drilling a recess as shown in FIG. 4 is prepared.

The rotary blade includes an inner blade Ka, a lower blade Kb, and a burr suppressing part K.
First, the inner blade Ka is set in a female shape with a horizontal V shape, and the lower blade Kb is formed at an appropriate angle on the lower side for shaving the lower flesh of the recess. A burr suppressing blade Kc for suppressing the generation of burrs is provided at the top end of the inner blade Ka at a horizontal angle.

Then, the rotary blade K is connected to an engraving machine, a gauge imitating the shape of the anti-slip piece is applied, and by the tracing action of the pantograph,
The rotary blade K is rotated along the periphery. Then, the lower blade Kb on the lower side shaves the bottom flesh of the recess, and at the same time, the inner blade Ka cuts the side wall of the periphery into a horizontal V-shaped female shape, and the burr suppressing part Kc on the top edge removes the burr. To accurately form an inclined surface by suppressing the occurrence of.

Next, the sole with the recess 5 formed thereon is placed on the opposite side, i.e.
An injection port 6 for resin injection is bored at approximately the center of the recess 5 on the side of the adhesive surface opposite to the ground surface.

Then, the sole is put into a mold that covers the recess 5 to form a liquid-tight chamber, and a thermoplastic resin such as TR resin is injected from the injection port 6 to form the anti-slip piece 4.

Incidentally, an adhesive may be applied to the bottom surface of the recess to enhance adhesiveness, and protrusions may be formed in a striped manner on the surface of the anti-slip piece 40 to enhance the anti-slip effect.

Finally, after the resin has hardened, the sole is removed from the mold.

Next, to explain the operation of this embodiment, when a conventional vertical wall kicks soil, the fulcrum and the point of application where the stretching force is applied act in the direction of separation, as shown in Figure 5 (A), so the end However, in the anti-slip piece of the present invention, as shown in FIG. 5(B), the adhesive surfaces of the parts are formed in a horizontal V-shape 4a, that is, slopes facing each other in opposite directions, so that the tearing force is reduced. is divided into a force parallel to the hypotenuse and a force perpendicular to the hypotenuse,
The absolute value of the normal force responsible for the direct W of separation decreases.

Moreover, since the parallel forces are in opposite directions, they become centripetal forces toward the 7-shaped valley, and the perpendicular forces become back-to-back forces along the V-shaped trough line, so the mutual forces become forces in opposite directions, crush each other, and act in the direction of reducing the force as an internal factor.

As a result, the tearing force acting on the interface is significantly attenuated,
Peeling will not occur even if the effects of stretching and contraction are applied.

In addition, since it extends all around the circumference, even if cumulative force is applied such as when walking, standing on tiptoe, or twisting, a relaxing effect acts in all directions and protects the adhesive surface.

Furthermore, the V-shape 4a has the effect of increasing the bonding area, thereby preventing peeling, and also effectively preventing water from entering, since the path is long.

(Effects) As described above, the present invention has the periphery of the sole on which the anti-slip piece is formed to have a slope with a widening cross-section that relieves tearing force, so the tearing force applied to the adhesive surface is alleviated, allowing for expansion and contraction. It does not peel off even when subjected to the action of , and the conventional drawback that peeling easily occurs at the adhesive interface is eliminated.

Therefore, even on rainy days etc., there is no water intrusion and comfortable use is possible.

In addition, the manufacturing method uses a unique rotating blade to scrape the bottom wall and use the inner blade to create a recess that matches the angle of the slope.
Since the occurrence of burrs can also be suppressed, mass production is easily possible by injecting the resin from an injection port drilled on the back side of the recess after forming the recess.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a bottom view of the sole of the present invention, FIG. 2 is a vertical cross-sectional view taken along the line A-A in FIG. Fig. 4 is a longitudinal sectional side view showing the state of charging and casting, and Fig. 4 is a longitudinal sectional front view of the rotary blade, Fig. 51! I is a schematic partial vertical cross-section showing the effect when tearing force is applied. 2. Sole body. Arch portion 4. Horizontal V-shape 5. K. Rotating blade b... Φ Lower blade Kc 2... Toe part 3... Anti-slip piece 4a... - Concave part 6... Injection port Ka... Inner blade K φ Hit burr suppressing part scraping

Claims (1)

[Scope of Claims] 1) A shoe sole in which a recess formed from the arch to the toe is filled with an elastic resin to form an anti-slip piece, the peripheral edge of which is formed into a transverse V-shaped cross section to alleviate tearing force. The structure of the anti-slip shoe sole is characterized by: 2) Combining an inner cutting blade with a transverse V-shaped cross section and a lower blade for scraping the under-metal underneath, a rotary blade equipped with a burr suppressing blade on the head to suppress the generation of burrs is used for copying operation. A recess with a horizontal V-shaped cross section is drilled at the periphery, the sole is placed in a mold, and a liquid resin that maintains elasticity after curing is injected through an injection port drilled on the back side of the recess, and after the resin hardens. A method for manufacturing a shoe sole anti-slip piece, characterized in that it is obtained by demolding.