JPS6230762B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sole, that is, the sole of footwear, consisting of two preformed wooden members, and these wooden members have a bulge at the base of the big toe (hereinafter referred to as the ball). They are connected to each other at the abutting points by intermediate members.

Wooden soles are already known. The wooden sole gives a comfortable feeling when walking, and the wood has the advantage of regulating humidity, absorbing excess sweat and releasing the absorbed moisture later. However, the hardness of the wooden bottom makes it uncomfortable, especially where the ball hits it. This is because when walking, the foot is supported only at the ball, making walking difficult or not easy on a hard wooden sole.

For this reason, a shoe sole consisting of two wooden members joined together at the ball impact point by a fabric-reinforced rubber was proposed (U.S. Pat.
No. 1964364). The manufacture of such soles is very time-consuming and does not guarantee a perfect bond between the intermediate member made of reinforcing rubber on the one hand and the two wooden members on the other hand. An intermediate member made of reinforcing rubber is produced separately in a mold and then joined to the two wooden members. The use of adhesives does not result in a reliable bond between the intermediate member made of rubber and the two wood members;
It was made in a dovetail style and required the use of nails to make this connection.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a bottom consisting of two wooden parts and one flexible intermediate part, the intermediate part being simple to make and, at the same time as its manufacture, ensuring that the two wooden parts are is combined with

In the present invention, the intermediate member essentially consists of foamed polyurethane. When this material is used in the production of intermediate parts, the wood reacts chemically with the polyisocyanate contained in the polyurethane foam mixture, ensuring that the wood and polyurethane are compatible without any additional measures. Join. The OH group of a compound consisting of OH groups contained in wood reacts with the isocyanate group of polyisocyanate,
Create an inseparable bond. Because the desired connection is made at the same time as the flexible intermediate member, it is much more convenient than building the elastic intermediate member separately and then joining it to the two wooden members using adhesive or mechanical means such as nails, screws, or clips. It is economical.

Furthermore, the polyurethane used has a lower specific gravity than rubber, so it can be manufactured more economically.

The upper part of the shoe can be secured to the sole of the invention, for example by nailing the upper part to the sole. When the sole of the present invention is used in sandals, footwear, etc., the upper part is preferably connected to the sole by nails or clips. In order to ensure the connection between the top and the bottom and the intermediate part in this case, the invention provides at least one insert in the intermediate part extending at right angles to the length of the bottom and up to the side edges of the intermediate part; Adapt it to join with the upper part.

Such inserts may be made of metal coupling pins or other materials such as synthetic plastic or wood, for example. However, it is important that the insert fits well into the polyurethane intermediate member to create a strong mechanical bond between the upper part and the insert.
This ensures that the top is connected to the bottom also in the area of the intermediate part.

It is also possible to arrange separate inserts on each side edge of the intermediate member that fit to some extent within the intermediate member. However, according to the invention it is advantageous for at least one insert to extend over the entire width of the intermediate part and to have an upper part connected to each end of the insert. In this way, it is possible to reliably prevent the insert from slipping out from the intermediate member. This is because, if a pulling force is applied to one end of the insert, the other end of the insert is prevented from being drawn into the intermediate member by the upper portion fixed thereto.

According to a preferred embodiment of the sole of the invention, the intermediate member is substantially triangular, preferably equilateral, across the length of the sole, the base of which constitutes the walking surface. In this case, the range of the intermediate member facing the sole of the foot is narrow, whereas the range of the intermediate member facing the walking surface of the sole is wide. For this reason, only one insert extends over the entire width of the intermediate member and is placed within a narrow area of the intermediate member to join with the upper part, with the mechanically strong wood part of the bottom near the point of joining with the upper part. Gain an advantage. In such an embodiment, the bonding surface between the intermediate member and the two wooden members is enlarged, so that the adhesion of the intermediate member to the wooden member is further improved.

In this case, the walking surface of the bottom is required to have great elongation, but since the intermediate member is very wide,
The elongation ratio per cm can be kept low and will not be destroyed by excessive elongation. Preferably, the apex of the triangle passes through the web in which the insert is provided. This makes it possible to reliably embed the insert in the intermediate member having a triangular cross section.

The present invention will be described in detail below based on drawings showing various aspects of the sole of the present invention.

The sole of the invention consists of a wooden front part 1 and a wooden rear part 2, these two parts being connected to each other by an intermediate member 3 made of polyurethane. The intermediate member 3 is arranged at a place where the ball of the foot hits, and
As shown in FIG. 5, it has a substantially triangular cross-section across the length of the base. The base 4 of the triangle is the walking surface 5 of the woody front part 1 and the woody back part 2.
It's along. The apex on the opposite side to the bottom side 4 is a web 6 that continuously connects the wooden front part 1 and the wooden rear part 2 on the side where the sole of the foot touches, and when the sole is bent, the web 6 This prevents the intermediate section from being stressed, which would otherwise be damaged.

An insert 7 is provided within this web 6. The insert 7 extends across the length of the bottom to the side edge 8 of the intermediate part 3. The insert 7 serves the purpose of joining the upper part and the sole of the shoe in the area of the intermediate part 3.

In the arrangement of FIG. 3, the insert 7 is made in the form of a tie pin and consists of a small metal tube grooved along its length. Into this are fitted tubes, pins, claws, clips, screws, especially threaded screws, which extend through the top of the shoe.

In the embodiment shown in FIG. 4, the insert 7 consists of a wooden pin, which is connected to the upper part by means of nails or clips, or by screws. The insert shown in FIG. 5 is a plastic cylinder into which pins, claws, clips, bolts, etc. are inserted for connection to the upper part of the shoe.

The insert 7 shown in FIG. 6 has a protrusion 9 which projects on the side edge 8 of the intermediate member 3 and emerges from the upper part of the shoe and is deformed into the shape of a rivet head. In this case too, the top part is securely connected to the bottom at the intermediate part 3.
The protrusion 9 can also be threaded and a nut attached thereto.

FIG. 7 shows a shoe fitted with the sole of the invention. The upper part 10 of the shoe is connected by nails 11 to the sole consisting of the two wooden parts 1, 2 and the intermediate part 3. Nail 11 is driven into woody parts 1 and 2,
The pawl 12 is connected to an insert 7 which extends to the side edge of the intermediate part 3.

When manufacturing the sole according to the invention, a wooden front part 1,
The wooden back part 2 as well as the insert 7 are each placed in a mold, and then the polyurethane foam mixture is introduced into the mold, for example by injection molding or by simple injection, and foamed.
In this case, the two wooden parts are placed in a mold corresponding to the sole to be manufactured in such a way that a gap is left in the seam region where the bulge of the big toe rests. The foamed polyurethane chemically bonds with the OH groups of the wood, creating an inseparable bond between the wood and the intermediate member 3. Since polyurethane has a lower specific gravity than, for example, rubber, the injection pressure can be lowered. The required mold is therefore lightweight and simple in construction. The manufacture of the soles of the present invention results in fewer rejects since the use of lower injection pressures eliminates the risk of polyurethane coming out of the mold gaps.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the bottom according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Figs. 3 to 5 are partially enlarged views of Fig. 2, showing the arrangement of the intermediate part and the insert. shows. FIG. 6 is a plan view showing the front part of the sole according to the invention together with an example of an insert, and FIG. 7 is an explanatory view of a shoe provided with the sole according to the invention. 1... Wooden front, 2... Wooden rear, 3... Intermediate member, 4... Bottom, 5... Walking surface, 6... Web, 7... Insert, 8... Side edge, 9... Protrusion Part, 10...Top, 11...Nail, 12...Claw.

Claims (1)

[Scope of Claims] 1. A footwear sole structure consisting of two separately molded front and rear wooden members and an intermediate member connecting them to each other, the intermediate member extending across the sole, It is located where the bulge at the base of the big toe touches, and is made of polyurethane foam containing polyisocyanate that is chemically bonded to the two woody parts, and the chemical bond forms a connection between the intermediate member, the front part, and the rear part. A sole of footwear characterized by being a thing. 2. At least one insert is embedded in the intermediate member, the insert extending at right angles to the length of the sole at least as far as the side edge of the intermediate member and being connected to the footwear upper. The soles of the footwear described in section. 3. A sole according to claim 1 or 2, characterized in that at least one insert is provided extending over the entire width of the intermediate member. 4. Claims 1 or 4, characterized in that the insert has an opening at the end extending to the side edge of the intermediate member, which receives a means for securing the upper part of the footwear to the sole, such as a pin, nail, clip, bolt, etc. The sole of the footwear described in item 2. 5. Claim 1 or 2, characterized in that the insert is provided with a protrusion that protrudes from the side end of the intermediate member, and that the protrusion extends to the upper part of the footwear.
The soles of the footwear described in section. 6. The intermediate member has a substantially triangular cross-section perpendicular to the length of the footwear, the base of the triangle being connected to the front portion;
The sole of the footwear according to claim 1, characterized in that the sole is flush with the bottom surface of the rear part. 7. The sole of claim 6, wherein the triangular cross section is substantially an equilateral triangle. 8. The sole of footwear according to claim 6, wherein the triangular tip passes through the web and the insert is embedded in the web. 9 (a) Mold the wooden front part and the wooden back part of the sole, which are separated from each other at the point where the bulge of the base of the big toe touches, and (b) Place the base of the big toe in the mold corresponding to the sole to be manufactured. (c) introducing a raw material for forming polyurethane foam containing polyisocyanate into the area, (d) introducing the raw material into the seam area where the bulge contacts the A method for manufacturing a footwear sole comprising the steps of foam aging and chemical bonding to two wood parts.