JPH0436643Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is lightweight, in which a ceramic spike is embedded in a nut made of a light metal, such as an aluminum alloy, and a cap made of the same material as the outsole of a shoe. The present invention also relates to a structure in which ceramic spikes are embedded in the sole of a shoe, which can reduce shearing impact on the ceramic spikes and prevent rainwater from entering.

(Prior technology) Conventionally, in order to embed ceramic spikes in the sole of a shoe by injection molding of resin, nuts made of fiber-reinforced resin, aluminum alloy, or steel are often used, and the nuts are in contact with the sole of the shoe. Two types of shoes are known: one that is exposed on the ground, and one that is buried in the sole of the shoe.

(Problem to be solved by the invention) The fiber-reinforced resin nuts mentioned above have superior toughness compared to metal ones, so when worn by being embedded in the sole of a shoe, they do not reduce the impact on the ceramic spikes. However, in order to satisfy the strength of the spikes collapsing due to repeated contact with the ground, it was necessary to increase the thickness of the nut, which resulted in a disadvantage that the sole of the shoe became heavier.

In addition, in the case of metal nuts, considering the specific gravity,
Aluminum alloys are often used, but the spike collapse strength is greater than that of resin nuts, and although the nut can be made thinner, the ceramic spikes often break.

Furthermore, the resin does not flow into the nut holding pin for fixing the nut in the mold, and a gap is created on the inner surface of the shoe's outsole, so a pumping action occurs while the shoe is being worn, and the inner surface of the shoe's outsole is The pressure was reduced, and rainwater entered from the contact surface of the sole of the shoe through the hole between the nut and the nut holding pin on the inner surface of the sole, causing discomfort.

Therefore, in the case of metal nuts, in order to prevent the spikes from breaking, a method was adopted in which the ceramic spikes near the sole contact surface of the shoe were surrounded with synthetic resin. It requires considerable precision, which is very disadvantageous in terms of cost, and because the hardness of ceramic spikes is much higher than that of the mold material, the parts where the ceramic spikes come into contact with the mold are easily damaged, making it necessary to replace the parts. It had the disadvantage of being forced to do so.

Furthermore, in order to prevent rainwater from entering, the nut retaining pin is made of urethane rubber and the ratio of the volume of the shoe's sole is made smaller on the contact surface side and thicker on the inner surface of the shoe's sole, based on the flange of the nut. Alternatively, it is possible to fill the gap between the nut holding pins on the inner surface of the sole by providing a spring, but this has the disadvantage that the sole becomes thicker and heavier.

(Means to be solved by the present invention) The present invention has a large diameter base of a ceramic spike.
A shoe book comprising a holding part for holding the base, a light metal nut having a flange formed on the outer edge of the holding part, and a truncated conical hole in the center that matches the diameter of the base of the ceramic spike. A cap made of the same type of resin as the bottom is fitted to the base of the spike and tightly fitted to the lower surface of the nut holding the nut, and the nut and the cap are placed in a mold. The ceramic spikes are embedded in the sole of the shoe by injection injection of resin.

In manufacturing, the aluminum alloy nut 2 integrated with the ceramic spike 1 and the cap 3 are placed in the mold D using a mold D, and the upper part of the nut 2 is placed between the nut holding pin B and the urethane rubber C. The resin forming the sole 4 of the shoe is injected and the ceramic spikes are embedded and molded into the sole of the shoe.

(Function and Effect) The structure of embedding the ceramic spike in the sole of the shoe of the present invention is composed of a ceramic spike, a light metal nut, and a cap, and the cap has a mortar-like shape near the flange of the nut, and It is made of the same type of resin as the outsole of a shoe with a truncated conical hole that matches the diameter of the base.

In the cross section of the nut, if the volume ratio of dividing the shoe's sole into two parts, the tread side and the inner side, based on the flange of the nut, is 1:1, then when the cap is fitted onto the spike, , the volume ratio of the sole contact surface side becomes smaller, and the resin flow when injection molding the resin that forms the shoe sole to be embedded in the shoe sole flows preferentially to the shoe sole contact surface side. , the solidification speed of the contact surface of the sole of the shoe becomes faster.

Therefore, the resin on the inner surface of the shoe outsole exerts a force that pushes the nut holding pin up toward the inner surface of the shoe outsole due to the secondary injection pressure just before the gate seal.

Therefore, by providing urethane rubber or a spring that contracts when the nut presser pin is pushed up, the nut presser on the outsole of the shoe is pushed up toward the inner surface of the shoe sole, and the void created by the pin is filled with resin. can prevent rainwater from entering.

Furthermore, while conventionally it was necessary to make the inner side of the shoe's sole thicker than the ground surface side based on the flange of the nut, this invention has a resin cap fitted to the nut. The thickness of the ground contact side can be made relatively thinner, the total thickness of the shoe sole can be made thinner, and a lightweight shoe sole with ceramic spikes embedded in the shoe sole can be molded.

As mentioned above, since the speed of the resin flowing toward the ground surface of the sole of the shoe is fast, the adhesion of the cap made of the same type of resin as the sole of the shoe is improved.

Therefore, the sole of the shoe and the cap at the boundary of the ground contact surface of the ceramic spike are tightly integrated, and the impact mitigation performance to the ceramic spike is also improved.

Furthermore, if the top surface of the cap is made flat, the height of the spikes can be easily aligned evenly by receiving force on the flat surface of the cap during mold production, which reduces mold production costs. In addition, there are fewer places in which the ceramic spikes of the mold come into contact, so damage to the mold can be reduced.

Furthermore, if the shape of the cap is formed into a conical shape near the flange of the nut, the Poisson's ratio will be increased and the cap will not be deformed by resin pressure.

In this way, it is possible to provide a shoe sole with ceramic spikes that is lightweight, can alleviate the shear impact applied to the ceramic spikes, and can prevent rainwater from entering.

(Example) Embodiments of the present invention will be described with reference to the drawings.

As shown in the figure, the present invention fixes to the large-diameter base of a ceramic spike 1 a holding part that wraps and holds the base, and an aluminum alloy nut 2 with a flange A formed on the outer edge of the holding part. Then, a cap 3 made of the same type of resin as the sole of the shoe and having a truncated cone-shaped hole 6 in the center that matches the diameter of the base of the ceramic spike is fitted onto the base of the spike, and the cap 3 is inserted into the base of the spike. This is a structure for embedding a ceramic spike in the sole of a shoe, which is characterized in that the nut and the cap are embedded in the sole 4 of the shoe by fitting tightly onto the lower surface of the holding nut.

In carrying out the present invention, the aluminum alloy nut 2 and the cap 3 integrated with the ceramic spike 1 are placed in the mold D using a mold D, and the upper part of the nut 2 is placed between the nut holding pin B and the urethane nut 2. The ceramic spikes are embedded and molded into the sole of the shoe by pressing with rubber C and injecting the resin that forms the sole of the shoe.

[Brief explanation of the drawing]

An embodiment of this invention is shown in FIG. 1, which is a sectional view of the main part of a ceramic spike embedded in the sole of a shoe. Figure 2 is a transparent top view of the cap;
The figure is a sectional view of a main part of an embodiment in which ceramic spikes are embedded in the sole of a shoe using a mold. 1...Ceramic spike, 2...Aluminum alloy nut, 3...Cap, 4...Shoe sole, 5...
Mortar-shaped, 6...hole, A...nut's flange, B...
...Nut holding pin, C...Urethane rubber, D
……Mold.

Claims (1)

[Scope of utility model registration request] A holding part that wraps and holds the base, and a light metal nut having a flange formed on the outer edge of the holding part are fixed to the large diameter base of the ceramic spike, and the nuts fit into the base of the spike, and A cap made of the same material as the shoe outsole that is in close contact with the lower surface of the holding nut is fitted, the nut and the cap are placed in a mold, and a resin is injected and embedded. A structure where the spikes are buried in the sole of the shoe.