JPS6341925Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a boot, and more particularly to a boot in which an upper and a thin extension extending from the upper are integrally formed of synthetic resin.

(Prior art) Conventionally, in boots consisting of an upper below the ankle and an extension above the ankle, many women's boots had the extension part thinner than the upper. Can be seen. These boots have an upper part and a sole part made of leather or pseudo-leather, and an extension part made of thin soft leather sewn into a cylindrical shape is sewn onto the upper part of the upper part. In addition to making it easier to fold back outward, the flexibility of this part is increased to make it easier to wear.

In addition, there are boots in which the upper and the extension part are integrated with synthetic resin, such as rain boots and women's boots in which the extension part has a quilted pattern or the like.

(Problems to be Solved by the Invention) Among the conventional examples described above, those in which the extension part is made of thin leather are easy to wear because the skin of the extension part stretches appropriately when walking. However, this method uses expensive leather and requires a process to sew it to the ankle seam, which increases the cost of the boots and requires time and effort to manufacture. It has a low water content and is sensitive to moisture.

On the other hand, boots with integrally formed uppers and extensions and women's boots that are integrally molded are satisfactory in terms of cost, manufacturing process, and strength because they are integrally formed, but the extensions are the same as the uppers. Because it is thick,
This part has the disadvantage that it is difficult to fold outward, and it is not flexible and heavy, making it uncomfortable to wear.

The latter disadvantage of integrally molded boots is due to the fact that the extension part is thicker than necessary and has poor flexibility.The present invention proposes an integrally molded boot extension using synthetic resin. The purpose is to provide boots that are easy to wear and have high durability by improving the flexibility of the parts.

(Structure of the device) The boot of the present invention has an upper part and an extension part that extends the upper part made of a synthetic resin material, and the wall thickness of the extension part is thinner than that of the upper part. This is what I did.

(Function) The upper and extension parts integrally formed of synthetic resin eliminate the need for a sewing process, and increase the durability and water resistance of the boots due to their high strength and waterproof properties. In addition, the thin and flexible extension portion makes soft contact with the foot, improving comfort, making it easy to fold back, and contributing to weight reduction.

(Example) An example of the present invention will be described based on the drawings. Boots A are boots for women, and are integrally molded (mainly by slush molding) using synthetic resin such as PVC. This boot A consists of an upper part 1 below the boundary part B of the ankle part and an extension part 2 above the boundary part B, and both parts are as described above.
It is integrally formed by the same member. The upper part 1 is formed into a shoe shape, and a sole 3 is formed integrally with the upper part 1 on the lower surface thereof, and a heel 4 is attached to the heel part of the sole 3. Incidentally, the upper 1 and the sole 3 are formed relatively thick in order to have the necessary strength. The extension part 2 above the boundary part B is formed to have a thickness about half that of the upper 1 to increase flexibility.

Further, the surface of the extension part 2 has wrinkles similar to the surface of the leather, and the boundary part B with the upper 1 forms a step so that the leather of the extension part 2 is sewn inside the upper 1, Protruding lines resembling perforations are provided along the steps to give the boots the feel of genuine leather boots.
Next, a boa fabric 5 of a color that harmonizes with the color of the boots A is attached to the upper inner surface of the extension part 2, and a mesh fabric 6 and an insole 10 that are comfortable to the touch are attached to the other inner surfaces of the shoe.

As mentioned above, in the boots A of this embodiment, since the wall thickness of the extension part 2 is suitably thinned, the flexibility of this part is improved, and it deforms while making soft contact with the foot while walking, making it difficult to walk. It is easy to fold, and as shown in Figure 3, it can be folded back without straining.
It is both functional and fashionable at low cost.

Next, to explain the manufacturing method of the boots A of the present invention, FIG. 5 shows the slush mold 8 of the boots A.
This figure shows a state in which a PVC solution 7 is injected into the mold 8.
The mold 8 is heated to gel the PVC solution 7 on the inner surface of the mold 8. The PVC solution 7 gels in proportion to the amount of heat applied,
Therefore, the thickness of the leather can be increased or decreased by adjusting the amount of heat applied in some way. The method for adjusting the wall thickness can be roughly divided into two methods: a method of adding a constant temperature to the PVC solution 7 and increasing or decreasing the heating time, a method of keeping the heating time constant and increasing or decreasing the heating temperature, and a method that uses a combination of the above. be. Fig. 5 shows the method. First, the mold 8 is immersed in the liquid 9 up to the vicinity of the boundary B, and the vape of the mold 8 is heated. After 4 minutes, the upper part of the extension 2 is immersed, and then After heating for 1 minute, pull up from the liquid 9 and remove the non-gelling PVC solution 7, then mold 8
Remove the leather stuck inside. At this time, the amount of heat applied to the mold 8 of the upper part 1 and the extension part 2 is in proportion to the time immersed in the liquid 9, at a ratio of 5:1,
The wall thickness also changes accordingly.

Figure 4 shows the method of
The lower wall thickness is made thinner, and this mold 8 is filled with liquid 9.
Dip it all the way to the top and remove it after 5 minutes. In this case, since the thickness of the upper part 1 of the forming mold 8 is thin, heat is easily transmitted, and it is heated to a higher temperature than the extension part 2. Therefore, the upper part 1 and the extension part 2 formed by heating for a certain period of time are heated. The wall thickness will be the same as that of the one.

This heating method uses a mold 8 shown in FIG. 4. (Not shown) (Effects of the invention) The present invention forms the upper part and the extension part that extends the upper part into the same body from a synthetic resin material, and also reduces the thickness of the extension part to the part of the upper part. Because it is thinner, it is possible to ensure the flexibility of the extension even when integrally molded using synthetic resin material, and therefore the contact with the ankle is soft when walking. It is more comfortable to wear and the same part can be easily folded back.

Furthermore, since the extension part is made thin, the boot can be made lighter.

[Brief explanation of the drawing]

Fig. 1 is a sectional view taken along line XX in Fig. 2, Fig. 2 is a perspective view showing a boot implementing the present invention, Fig. 3 is a perspective view showing a state in which the upper end of the extension is folded back to the outside, and Fig. 4 and FIG. 5 are cross-sectional views showing the manufacturing state. In the figure, A: Boots, B: Boundary area, 1: Upper cover,
2: Extension.

Claims (1)

[Scope of utility model registration request] A boot comprising an upper and an extension extending upward from the upper, which are made of a synthetic resin and formed into the same body, and the extension has a wall thickness that is thinner than that of the upper.