JP3062985B2 - Underground and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground space which can be used for civil engineering, construction sites, agricultural work, and various other uses, and to a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, underground sheaves are manufactured by attaching an upper obtained by sewing a cloth and a bottom made of rubber or synthetic resin by a sticking or sewing method. The sticking-type fixing means that the upper is hung on an aluminum foot mold, an adhesive is applied to the periphery and the bottom of the upper, and the adhesive surface of the unvulcanized basement is treated with a solvent using a glue. This is a method of vulcanizing after sticking both.

[0003] The fixing by sewing means that the upper is mainly suspended from an aluminum foot mold, and the base which has been vulcanized (pressed) in advance is pasted with an adhesive and sewn with a sewing machine or the like. It is a method in which the bottom is vulcanized (pressed) and the bottom is vulcanized (pressed) only by sewing without suspending the sewn upper or using an adhesive. Recently, the former method of the pasting type has been often adopted due to labor shortage and cost.

[0004] In order to make it easy for the base of the basement to adhere to the sole of the basement, basement bases in which the vicinity of the base is curved upward are widely provided. In order to maintain the hardness, it is necessary to vulcanize the bottom of each basement to increase the hardness.

[0005]

In the case of the sticking type employed in the above manufacturing method, although it is possible to obtain a firmly fixed state, it is necessary to adhere in a state of vulcanization. A high hardness was not obtained, and it was not possible to form a curved portion of the soil foot into an upper arch shape.
In addition, in the method by the sewing method, the bottom can be vulcanized and formed freely so that the bottom of the soil is curved, but the vulcanized bottom is hard to adhere firmly to the upper peripheral side, Although it was reinforced by sewing, there was a tendency that the upper peripheral portion was easily peeled off. In addition, since bonding and stitching operations are required, it takes time and effort to manufacture, and there is a problem that water easily penetrates from a sewn portion.

[0006]

That is, the present invention has been made to solve the above-mentioned problems, and the gist of the present invention is to increase the hardness occupying the central portion of the bottom including the soil foot. A vulcanized central portion and a peripheral portion formed from a vulcanized state surrounding the central portion and corresponding to substantially the entire periphery of the bottom and having a lower hardness than the central portion, and both portions are formed by Each underground is characterized by being glued at the rim and glued to the bottom of the upper.

[0007] The present invention also provides a vulcanized central portion including a soil foot and a central portion of the bottom, which is vulcanized to have a high hardness, and a central portion surrounding the central portion and corresponding to substantially the entire periphery of the bottom. An unvulcanized peripheral portion having a lower hardness than the lower portion is bonded to the upper bottom portion, and vulcanization molding is performed thereon.

The present invention further provides a central portion vulcanized and formed so as to have a high hardness occupying the central portion of the bottom including the soil foot portion, and a central portion surrounding the central portion and corresponding to substantially the entire circumference of the bottom. The uncured peripheral part having a lower hardness than the part is bonded to each other at a contact edge to form a single bottom, which is bonded to the upper bottom and vulcanized. The gist also describes the method of manufacturing underground.

[0009]

In the present invention, the central part of the bottom of the basement is formed with high hardness by vulcanization molding, so that it can be made a bottom with stability and shape retention, and a peripheral part surrounding the bottom is formed. Since the hardness is lower than that of the vulcanized state, the adhesion to the upper can be improved. Alternatively, according to the present invention, the peripheral portion is in an unvulcanized state, and is bonded to the vulcanized molded central portion and vulcanized, whereby the adhesive strength to the upper can be further increased, and it does not peel off during use. .

Hereinafter, description will be made with reference to the drawings of the embodiment. FIG. 1 shows a bottom surface of each underground of the present invention, and FIG.
It is sectional drawing of the AA 'line.

In these figures, 1 is an upper and 2 is an insole, which are sewn with fabric. Also 3 and 4
Are a central portion and a peripheral portion constituting a bottom in the present invention, the former includes a soil foot 3A and occupies the central portion 3 of the bottom and is vulcanized so as to have a high hardness, and the latter is a vulcanized molding. 3 is formed from an unvulcanized state so as to correspond to substantially the entire circumference of the bottom and to have a lower hardness than the central portion 3.

The central portion 3 and the peripheral portion 4 are formed of rubber. The central portion 3 is formed by vulcanizing powdered vulcanized rubber and has a higher hardness than the peripheral edge portion 4. For example, a Shore hardness tester is about 50 to 70 degrees, preferably 55 degrees. It is about 65 degrees. At the time of vulcanization or molding, the soil base 3A can be formed into an arch shape curved upward as shown in FIG. By molding in this manner, the bottom is in close contact with the foot of the soil and the comfort can be improved.

On the other hand, the peripheral portion 4 surrounds the central portion 3 and corresponds to substantially the entire periphery of the bottom and is formed with a lower hardness than the central portion 3. The hardness at this time is about 30 to 55 degrees, preferably 35 to 45 degrees, in Shore hardness. Since the peripheral portion 4 corresponds to substantially the entire periphery of the bottom and surrounds the peripheral edge of the upper 1, the strength when the peripheral portion 4 is bonded to the upper 1 can be increased.

The contact edge between the central part 3 and the peripheral part 4 is shown in FIG.
As described above, it is preferable to provide staggered steps to increase the bonding area, and in this sense, it is also possible to form these portions with tapered surfaces in mutually opposite directions.

Although not shown, in order to increase the strength of the contact edge between the central portion 3 and the peripheral edge portion 4, a band-shaped reinforcing piece straddling the central portion 3 and the peripheral portion 4 is bonded to a necessary portion or an outer surface or an inner surface over the entire circumference. I can do it. The reinforcing piece may be vulcanized, but may be vulcanized and then bonded and then vulcanized.

When manufacturing the underground wall of the present invention, first, the upper 1 is suspended on the lower surface of the midsole 2 and the central portion 3 formed by vulcanization molding is formed at the center of the bottom of the suspended upper 1. Glue using an adhesive. Next, the upper surface of the uncured peripheral portion 4 is treated with a solvent such as gasoline to form a paste, which is adhered to the upper surface via the adhesive applied to the upper 1 and the midsole 2 and the central portion 3. And then vulcanized to form a stronger bond.

When the peripheral portion 4 is vulcanized, its outer edge can be raised and adhered to the peripheral edge of the upper 1 as shown in FIG. 2, so that the strength of this portion can be improved and Water resistance can be improved.

According to the underground of the present invention obtained as described above, since the central portion 3 is formed with a higher hardness than the peripheral portion 4, the grounding, walking, etc. can be performed stably. ,
In addition, the upper curved surface of the soil foot 3A is stably maintained, and the peripheral edge 4 is formed to have relatively low hardness, so that the flexibility of the bending motion is improved, and in the place where the scaffold is poor. The adhesion to the ground surface and the securing performance are improved, walking can be easily and stably performed, and the comfort can be improved.

Further, in the manufacturing method of the present invention, the uncured peripheral portion 4 is vulcanized and formed after bonding.
Can be appropriately adjusted, and usually the hardness is lower than that of the central portion 3, but it is also possible to make the hardness comparable to the hardness of the central portion 3. Even in this case, since the vulcanization is performed after bonding, the intended purpose can be achieved.

In the present invention, not only the underground wall is manufactured as described above, but also it is possible to manufacture it by bonding it to the bottom of the upper 1 using a preformed bottom.
That is, this is a method in which the central portion 3 and the peripheral edge portion 4 are bonded to each other at the contact edge thereof as in the above, and are previously formed as a single bottom. By doing so, it is possible to manufacture the semiconductor device by the same operation as the normal manufacturing method for each underground. Even when a single bottom is used, the central portion 3 is vulcanized in advance, and is bonded to the upper 1 using the unvulcanized peripheral portion 4 and then vulcanized. is there.

The embodiment shown in FIGS. 3 and 4 is an example in which a reinforcing surface 4A connected to the peripheral portion 4 at the bottom is provided. It is effective because it can reinforce the easy parts. In the case of this example as well, the soil foot of the central portion 3 may be curved in an arch shape. In addition, this reinforcement surface 4A can be provided on other necessary portions such as the outside of the soil foot, the heel, and the like.

[0022]

According to the present invention having the above-described structure, the central portion where stability and shape retention are more strongly required and the peripheral portion where mobility, adhesion and strength are required are combined. , These have a basement every time they are satisfied at the same time,
It can provide a comfortable and wear-resistant basement every time,
Further, there is an advantage that the vulcanization molding technique can be efficiently used by skillfully utilizing the technique.

[Brief description of the drawings]

FIG. 1 is a bottom view showing one embodiment of an underground obtained by the present invention.

FIG. 2 is a partial cross-sectional view taken along line A-A ′ of FIG.

FIG. 3 is a bottom view of an underground base used in another embodiment of the present invention.

FIG. 4 is a partial side view of a basement using the bottom of FIG. 3;

[Explanation of symbols]

 1 ··· Upper 2 ··· Insole 3 ··· Central part 3A · · · Soil base 4 · · · Peripheral part

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI A43B 10/00 302 (58) Field surveyed (Int.Cl. ⁷ , DB name) A43B 3/00 A43B 13/00-13 / 42 A43D 25/06-25/10

Claims (5)

(57) [Claims] 1. A vulcanized central portion including a soil foot portion and occupying a central portion of a bottom, and a vulcanization-molded portion having a high hardness. A base portion formed from a non-vulcanized state so as to have a lower height, wherein both portions are bonded at their contact edges and are bonded to the upper bottom portion. 2. The underground base according to claim 1, wherein a band-shaped reinforcing piece straddling the central portion and the peripheral portion is bonded to a contact edge between the central portion and the peripheral portion. 3. The underground base according to claim 1, wherein a reinforcing surface is connected to a peripheral portion to form a bottom. 4. A central portion vulcanized and formed so as to have a high hardness occupying the central portion of the bottom including the soil foot portion, and the central portion is surrounded by substantially the entire periphery of the bottom and has a hardness higher than the central portion. A method for manufacturing an underground container, comprising: bonding an uncured peripheral portion having a low level to an upper bottom portion; 5. A central portion vulcanized and formed so as to have a high hardness occupying the central portion of the bottom including the soil foot portion, and surrounding the central portion and corresponding to substantially the entire periphery of the bottom and having a hardness higher than the central portion. The lower edge of the unvulcanized state is bonded to each other at a contact edge to form a single bottom, which is bonded to the upper bottom and vulcanized. Manufacturing method.