JP2005046472A - Waterproof shoes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide waterproof shoes having high waterproofness capable of preventing water leak when used under severe conditions. <P>SOLUTION: The waterproof shoe 1 is provided with a sole 3 and an upper 5, the upper 5 has a face material 7 and a back material 9, and the back material has a waterproof film 11. The sole 3 has an insole 17. Lengthwise stitches S on the face material 7 extend toward the insole 17 and has an end T of the stitches which are stopped above an insole surface 21. The face material 7 is placed over the back material 9 so as to form an overlapped end part which is folded toward an insole bottom face 25 and is extended on an outer circumference of the insole 17. The overlapped end part has circumferential stitches sewn along the outer circumference of the insole. Preferably, a position of the end T of the stitches is 3-10 mm above the insole surface 21. Thereby, the waterproof shoes 1 are capable of preventing water leak if they are used in water for hours. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to waterproof shoes.

  Conventional shoes are formed as follows. 5 and 6 show a conventional shoe by a bag sewing method (also called a California method). FIG. 5 is a perspective view showing a bag body 41 which is a shoe member according to this manufacturing method. FIG. 6 is a partially enlarged cross-sectional view of a shoe 43 in which the bag body 41 is used. As shown in FIG. 5, the upper 45 and the midsole 47 are sewn into a bag shape in advance to form a bag body 41. A sole 49 is attached to the bag body 41. Due to the manufacturing method, a circumferential seam 51 along the peripheral edge of the midsole is formed.

  The cut pieces of the surface material 50 shown in FIG. Therefore, the shoe 43 includes a seam G (G1, G2, etc.) reaching the insole 47. The seam N (N1, N2, etc.) of the seam G intersects with the seam 51 in the circumferential direction. The sewing thread having the vertical seam N is separated from the inside of the backing 53 by a waterproof film 55. However, this sewing thread is in contact with the sewing thread and the end of the circumferential seam 51 described above.

  The entry of water into the shoe 43 is due to the penetration of water from the holes of the seams N in the vertical direction. Water is likely to be transmitted between the fibers of the sewing thread 57 itself exposed on the surface of the surface material or through a micro gap between the sewing thread 57 and the surface material 50. It is because of the capillary phenomenon that it is easy to be transmitted. Due to the capillary action, even a small amount of water permeates from the sewing thread 57 toward the circumferential seam 51. The water that reaches the circumferential seam 51 penetrates the seam of the seam 51 and permeates in the circumferential direction. In the insole 47 bordered by the sewing thread, water diffuses from the periphery to the inside of the insole by capillary action.

In order to suppress the capillary phenomenon, waterproofing of sewing thread of shoes has been conventionally performed, but it is not sufficient. The insole becomes damp when used in situations where it is immersed in water for a long time. Japanese Laid-Open Patent Publication No. 11-332610 discloses a waterproof shoe manufactured by a bag sewing method for the purpose of preventing the flooding. The content is to sew the above-described vertical seam on the circumferential seam. Thereby, the inundation resulting from said seam crossing is prevented.
JP-A-11-332610

  The waterproof shoes described in the above publication are not flooded in a short time. However, even if these shoes are soaked in water for a long time, they may get wet from the insole and are not waterproof enough. Even if the circumferential seam and the vertical seam do not intersect with each other, there is a problem that a hole is formed in the waterproof film and the waterproof film does not have a waterproof function, so that there is still a risk of inundation. It is also conceivable that water that has penetrated up to the thread of the seam reaches the insole through the gap between the seams of the surface material and the like by capillarity. The present invention has been made in view of such a situation, and an object of the present invention is to provide a waterproof shoe having high waterproofness that is difficult to be submerged even when used under severe conditions in mountain climbing shoes, golf shoes and other sports shoes. Yes.

  The waterproof shoe according to the present invention includes a sole and an upper, and the upper includes a front material and a back material, and the back material includes a waterproof film. The sole includes an insole, and a vertical seam of a front material facing the insole has an end of a seam that is sewn up above the insole surface. The top layer and the back material overlapped and folded into the bottom of the midsole, and the end of the overlay extends from the outer circumference of the midsole to the middle of the bottom of the midsole. With circumferential seam worn.

  All of the waterproof shoes in the first half of the shoe that have the vertical seam of the front surface have the seam end, and 50% or more of the other vertical seam portions have the seam end. It is preferable.

  Further, it is more preferable that all the other vertical seams have the seam ends.

  In the waterproof shoe, the end position of the seam is preferably 3 mm or more and 10 mm or less upward from the midsole surface.

  Furthermore, it is more preferable that the position of the end of the seam is 5 mm or more and 9 mm or less upward from the surface of the midsole.

  This waterproof shoe is not easily submerged even under severe conditions such as being used for a long time in a state of being immersed in water and has an excellent waterproof function.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  1 to 4 show a waterproof shoe 1 according to an embodiment of the present invention. FIG. 1 is a front view of the waterproof shoe 1. FIG. 2 is a cross-sectional view showing a state in which the waterproof shoe 1 of FIG. 1 is cut along a length direction line. FIG. 3 is a partially enlarged cross-sectional view taken along line III-III in FIG. 4 is a partially enlarged sectional view taken along line IV-IV in FIG. The waterproof shoe 1 includes a sole 3 and an upper 5, and the upper 5 includes a front material 7 and a back material 9. The backing 9 includes a waterproof film 11. In addition, the backing 9 includes a cushion layer 13 made of an elastic material and a woven fabric 15 covering the cushion layer 13. The sole 3 includes an insole 17 and an outsole (including a case where a shoe sole layer other than the insole is composed of a plurality of layers) 19.

  The material, shape, dimensions, and the like of the upper 5 are the same as those of known shoe uppers. As the surface material 7, a known water-resistant surface material used for shoes can be used. Usually, artificial leather (a non-woven fabric impregnated with polyurethane on a base fabric coated with polyurethane), natural leather or the like is preferably used. You may stick a waterproof film on the back of this surface material.

  For the cushion layer 13 of the backing 9, a foamed layer or felt made of synthetic resin, rubber or the like is used. As the base material of the foam layer, polyurethane is mainly used. The foam layer is preferably provided with open cells from the viewpoint of air permeability. The waterproof film 11 is usually provided between the surface material 7. A tricot material may be disposed between the surface material 7 and the waterproof film.

  In FIG. 2, the waterproof film 11 is bonded to the surface of the backing 9 on the front material 7 side. The waterproof film 11 is preferably a water-permeable film that does not pass water. For example, a film made of a material selected from the group of nylons such as polytetrafluoroethylene, polyurethane, polyvinyl alcohol, and nylon 6, and having a large number of fine holes for allowing water vapor to pass therethrough can be used. From the viewpoint of performance such as water vapor permeability and film strength, those made of polytetrafluoroethylene or polyurethane are preferred. Particularly preferred is a film (Gore-Tex (registered trademark) or the like) made of a polytetrafluoroethylene material.

  As the woven fabric 15, a so-called mesh is used. The mesh yarn is usually a multifilament in which monofilaments such as natural fibers or synthetic fibers are bundled. Specific examples of these fibers include synthetic fibers such as nylon, polypropylene, and polyester as well as natural fibers such as hemp and cotton. The woven fabric is a fabric woven from fibers or a fabric knitted from fibers.

  In FIG. 2, the surface material 7 includes a vertical seam S at the joint of the cut pieces. These longitudinal seams S (S1, S2 and S3) have seam ends T (T1, T2 and T3) sewn above the midsole surface 21. The seam end T is preferably waterproofed by applying a waterproof adhesive, sealing with resin, or the like.

  The thread used for sewing may be a thread that is usually used for manufacturing shoes. However, when the yarn is made of a material having water absorption, it is waterproofed in advance or the seam is sealed. The seam is sealed mainly by coating with a thermoplastic resin having a low melting point such as polyethylene. Specifically, the seam is preferably sealed by coating with a film of the thermoplastic resin. When the yarn is composed of multifilaments, it is preferably treated with an impregnating agent so that the gaps between the filaments are filled. This is to prevent capillary action from occurring in the sewing thread. A monofilament thread is preferable as the sewing thread in that there is no gap between the filaments. From the viewpoint of waterproofness, monofilament yarn made of aliphatic polyamide or polyester is more preferable.

  In general, the ease of water immersion varies depending on the location of the shoe. The first half of the shoe is easily hit by rain and water. Further, in the first half of the shoe, the pressure of water hitting the seam when the exposed seam advances due to human running or the like is high. On the other hand, the latter half of the shoe is often covered with the bottom of the pants, and the pressure of water hitting the seam is small. Therefore, the seam of the first half of the waterproof shoe 1 is in a stricter condition than the latter half of the waterproof shoe 1.

  However, the latter half of the waterproof shoe 1 is less likely to be flooded due to the configuration in which the multi-layer end portion 23 of the upper 5 which will be described later is extended to the bottom surface 25 of the midsole. If the seam end T of the front half of the waterproof shoe 1 is sewn on the midsole surface 21, most of the water can be prevented. It is preferable that 50% or more of all the vertical seams S in the first half of the waterproof shoe 1 and the vertical seams S in other portions have the seam end T. More preferably, all of the longitudinal seams S are sewn above the midsole surface 21. Even if this waterproof shoe 1 is used for a long time in the rain, it is prevented from being flooded.

  The distance H from the midsole surface 21 where the seam end T is located is preferably 3 mm or more and 10 mm or less. If the distance H is less than 3 mm, the insole surface 21 and the seam end T are close to each other. Therefore, under severe conditions, water entering from the longitudinal seam S may be transmitted to the insole surface 21. Above 10 mm, there is a problem of limitations in adjusting the durability and appearance of the shoe 1. More preferably, the position of the seam end T is 5 mm or more and 9 mm or less upward from the midsole surface 21.

  The front material 7 and the back material 9 are provided with a multi-layer end portion 23 that is bent beyond the periphery of the insole and extends from the insole periphery to the inside of the insole bottom surface 25. A circumferential seam 37 in which the front material 7 and the back material 9 are stitched together in the circumferential direction at the multi-layer end 23 is provided. At the circumferential seam 37, the front material and the back material are penetrated by the sewing thread. In other words, the circumferential seam 37 has a hole penetrating the waterproof film. At the circumferential seam 37, the waterproof film 11 does not have waterproof performance. However, in the waterproof shoe 1, the circumferential seam 37 is separated from the sewing end T and exceeds the insole periphery. At least the bottom 5 side of the bottom 5 of the upper 5 is covered and joined together by the bottom 17. Thereby, even if water may ooze out from the outside to the inner surface side of the surface material 7 (outer surface side of the backing material 9) through the seam S, the distance from the circumferential seam 37 that penetrates the waterproof film 11 is separated. Therefore, the water can be prevented from reaching the circumferential seam 37. Also, even if the water reaches the circumferential seam 37 and water oozes out to the inner side surface (the bottom side of the bottom bottom 25) of the backing 9 through the seam, It is on the 25th side and is not a portion that directly touches the foot, and high waterproofness is achieved.

  As the material of the outsole 19, a rubber composition, a synthetic resin, or a thermoplastic elastomer is used. As the base rubber of the rubber composition, butadiene rubber, acrylonitrile-butadiene rubber, styrene butadiene rubber, isoprene rubber, butyl rubber, chloroprene rubber, ethylene-propylene-diene rubber, natural rubber, or the like is used. Examples of the resin for the synthetic resin and the thermoplastic elastomer include foamed polyurethane, vinyl chloride resin, EVA resin, and the like.

  The side portion 39 of the outsole 19 is usually attached so as to reach a position above the seam end T. This is to cover the seam end T. As a result, the seam end T and the seam of the upper 5 below the seam are sealed. From the viewpoint of appearance, it is preferable that the seam end T is covered.

  The manufacturing method of the shoe 1 is roughly as follows. The backing 9 and the front material 7 are sewn along the mouth edge 27 of the mouthpiece at the upper part of the waterproof shoe 1. The backing 9 is usually provided with a ring-shaped cushion 29 along the mouth edge 27 of the mouth. A portion of the front surface that is opened and closed by a shoelace is attached to the inner side of the backing 9 and a tongue-like piece 33 is attached from the back side.

  Thus, the upper 5 in which the front material 7 and the back material 9 are stitched together at the upper part is attached to the last with the lower part opened. An insole 17 is disposed on the bottom surface of the last. The multi-layer end portion 23 in which the upper 5 is folded to the bottom side 25 of the middle bottom is stitched together. In this way, the multi-layered end 23 extends from the outer circumference of the midsole toward the bottom side 25 of the midsole.

  It is preferable that the width W from the periphery of the middle bottom where the multi-layer end portion 23 extends is 5 mm or more and 30 mm or less. If it is less than 5 mm, the bonding strength between the outsole and the upper is insufficient. On the other hand, if it is larger than 30 mm, the front material and the back material are wasted.

  The multi-layer end portion 23 sewn in the mid-sole circumferential direction at the mid-sole bottom surface 25 is bonded to the mid-sole bottom surface 25 with an adhesive. This stitching prevents creases and uneven application of adhesive. In addition, the multi-layer end portion 23 can be sealed with resin. For this bonding or sealing, it is desirable to select a weather-resistant, solvent-free material or the like that does not easily fade or deteriorate due to changes over time.

  In the waterproof shoe 1 configured as described above, even if water penetrates from the longitudinal seam S, the water is not transmitted to the backing material. For this reason, it is possible to prevent water from entering the waterproof shoe even under severe conditions where the waterproof shoe is immersed in water for a long time.

  The present invention can be applied to various shoes that require waterproofing, such as athletic shoes such as golf shoes and soccer shoes, wading shoes, and ordinary men's shoes.

FIG. 1 is a front view showing a waterproof shoe according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the waterproof shoe of FIG. 1 is cut along a length direction line. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a partially enlarged cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a perspective view illustrating a conventional shoe bag body. FIG. 6 is a partially enlarged sectional view showing a conventional shoe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,43 ... Waterproof shoes 3 ... Sole 5, 45 ... Upper 7, 50 ... Front material 9, 53 ... Backing material 11, 55 ... Waterproof film 13 ... Cushion layer DESCRIPTION OF SYMBOLS 15 ... Woven cloth 17, 47 ... Insole 19, 49 ... Outsole 21 ... Insole surface 23 ... Multistory edge part 25 ... Insole bottom 27 ... Wear mouth Edge 37, 51 ... circumferential seam

Claims (5)

It has a sole and an upper,
This upper has a front and back material,
The backing has a waterproof film,
The sole has an insole,
The vertical seam of the front facing the insole has a seam end that is sewn on the upper side of the insole surface,
The top layer and the back material overlapped and folded to the bottom side of the bottom of the midsole, extending from the outer periphery of the bottom to the middle of the bottom of the bottom of the bottom. Waterproof shoes with worn circumferential seams.   2. All the longitudinal seams of the front material in the front half of the shoe are provided with the seam end, and 50% or more of the other vertical seam portions are provided with the seam end. Waterproof shoes.   The waterproof shoe according to claim 2, wherein all the other vertical seams have the seam ends.   The waterproof shoe according to any one of claims 1 to 3, wherein a position of the seam end is 3 mm or more and 10 mm or less upward from the surface of the midsole. The waterproof shoe according to claim 4, wherein a position of the end of the seam is 5 mm or more and 9 mm or less upward from the surface of the midsole.

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