JP3521314B2 - Conductive shoes - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly for use in a work environment where static electricity is disliked, for example, in a clean room for manufacturing LSI, or a place where flammable or flammable petroleum, gasoline, organic solvent, etc. are handled. And shoes with antistatic properties for use in, ie conductive shoes.

[0002]

2. Description of the Related Art In recent years, many clothing and shoes use highly insulating materials such as synthetic resin, synthetic fiber and synthetic rubber, so that static electricity is naturally generated when worn. To do. Therefore, in an environment where electronic devices such as LSIs and VLSIs are manufactured or handled, LSIs by electrostatic charging,
Appropriate antistatic measures must be taken to prevent damage to the VLSI and to prevent dust that adheres to clothing from being brought into the work environment due to static electricity. In addition, even in an environment where flammable or ignitable substances such as petroleum, gasoline and organic solvents are used, there is a danger of fire or explosion due to static electricity, so it is necessary to take antistatic measures. In addition to the environment where the static electricity must be strictly eliminated as described above, the static electricity spark often causes discomfort to the human body, especially when the air is dry. In order to solve such a problem, various researches and developments have hitherto been made on a shoe which imparts conductivity to a shoe sole to prevent electrostatic charge of a human body.

As a method of imparting conductivity to the shoe sole, there is a method of adding an additive to the resin itself constituting the shoe sole to make the shoe sole conductive. For example, in JP-B-59-32324, JP-B-2-28721, and JP-A-59-62003, various cationic, nonionic, anionic or amphoteric surfactants or their combinations are used as antistatic agents. There has been proposed a conductive footwear including a shoe sole injection-molded using a polyvinyl chloride-based resin compound containing the above. Further, in these documents, as the electrically conductive shoe sole material, reference is also made to a resin mixture in which carbon black is mixed, and a resin in which an antistatic agent is added to polyurethane (Jpn. Pat. Appln. -28721). Further, in JP-A-2000-14404, a specific ethylene-vinyl acetate copolymer or a specific ethylene-
An antistatic agent (eg, quaternary ammonium salt, stearoamidopropyldimethyl-β-) is added to 100 parts by weight of a polymer component composed of a vinyl acetate copolymer and a polymer component of acrylonitrile-butadiene rubber.
Cationic activators such as hydroxyethyl / ammonium / nitrate, anionic or nonionic activators,
Disclosed is an antistatic shoe sole obtained by heat-foaming and curing a mixture containing 1 to 10 parts by weight of a double-sided surfactant metal salt, polyhydric alcohol derivative, alkylamine derivative, etc.), a foaming agent, and a crosslinking agent.

[0004]

However, in the method of adding conductivity to the shoe sole resin itself to give conductivity, defects such as defective molding or defective adhesion of members may occur depending on the amount added. , It is necessary to take into consideration the relationship with the physical properties of the material such as moldability and adhesiveness. In addition, in these methods, since an additive such as an antistatic agent is added as a separate material to the main part of the shoe sole, the cost of the material itself increases.

As described above, the method of adding an additive to a shoe sole material changes the physical properties of the material, so that there is a limit to the amount of addition from the viewpoint of the required function (moldability, cushioning property after production, etc.). Further, since the shoe sole is required to have a certain thickness or more in terms of its function, there is a limit to a method of reducing the thickness of the shoe sole to suppress the addition amount of the antistatic agent. For these reasons, many methods of separately providing a conductive portion on the shoe sole have been studied. Japanese Unexamined Patent Publication No. 63-46101 discloses electrostatic charging of polyurethane direct sole using a polyurethane resin to which an additive (carbon black or a fine metal powder antistatic agent such as quaternary ammonium salt) for improving conductivity is added. In a protective shoe, two sheet electrodes are attached to the insole of one of them, and the other electrode is embedded inside a conductive shoe sole and placed side by side vertically, and the sheet electrodes are connected by a conductive material. A structure in which the electrodes are connected or connected with the same electrode is proposed. By arranging the electrodes side by side on the upper and lower two sheets of the shoe sole, the distance between the electrode and the lower surface of the shoe sole is substantially shortened, and as a result, conductivity is secured between the electrode portion where the foot contacts and the shoe sole surface. Makes it easy. Therefore, the polyurethane resin used as the material for the sole has a high electric resistance value, but does not sacrifice the comfort of the shoe by reducing the thickness of the sole, and it has a sufficiently high conductivity even if the sole has a thick sole. It is disclosed that shoes can be provided. However, since the structure having the sheet electrode inside the conductive shoe sole cannot be handled by the conventional method of manufacturing the shoe sole by injection molding, it is considered that the molding of the shoe sole becomes complicated. It cannot cope well with diversification.

On the other hand, Japanese Unexamined Patent Application Publication No. 2000-102401 discloses a linear or strip-shaped elongated conductive portion formed by sewing conductive threads, which has contact surfaces on the upper and lower surfaces of the insole, and which is provided on the upper surface of the elongated conductive portion. There is proposed an antistatic shoe in which a contacting insole and a midsole in contact with the lower surface of the elongated conductive portion are provided with contact portions which come into contact with a part of the elongated conductive portion to serve as contacts. The contact portion of the insole is sewn with a conductive thread, and the contact portion of the midsole is punched out from a member (for example, EVA foam) forming the midsole, and the punched portion is wrapped with a conductive cloth. Alternatively, it is made of a single conductive material. This antistatic shoe can provide a conductive sole even if the midsole is made of non-conductive EVA, because it has a contact portion. However, since the contact part is punched out of a member and then the punched part wound with a conductive cloth is inserted again into the punched hole or a conductive different member is inserted, the manufacturing process is complicated. Also, since the punched out part of the midsole is no longer integral with the midsole body, it is considered that the sole of the foot that comes into contact with the midsole feels unnatural. Also, because the method of punching holes in the midsole is used, it is not possible to provide a conductive area that is too large for the surface area of the midsole. In addition, there are many proposals for conductive shoes with a so-called ground structure in which conductive materials such as metal are provided in the sole material or midsole to provide conductivity from the sole of the foot to the ground surface. Has been done. However, these have some disadvantages such as not being able to obtain a sufficient conductive effect, having a complicated structure, or having poor foot contact when wearing shoes.

The object of the present invention is to solve the problems that could not be solved by the above-mentioned prior art, but there is no limitation on the thickness or shape of the shoe sole, and there is no influence on the comfort such as foot contact. An object of the present invention is to provide a conductive shoe in which the conductivity of the sole can be easily adjusted. In addition, an object of the present invention is to use a non-conductive material for shoes (generally EVA, etc.) having excellent cushioning properties, which has been conventionally used, in an antistatic agent by a simpler method without manufacturing complicated steps. It is an object of the present invention to provide a conductive shoe that can be manufactured as it is without adding additives such as.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present inventors have made extensive studies. As a result, a conductive path is provided on the midsole made of a non-conductive material for shoes such as EVA having a good cushioning property by a simpler method than the method according to the related art, and the upper side of the midsole is subjected to the conductive treatment. It has been found that it is possible to provide a conductive shoe with a sole structure that provides conductivity between the insole and the conductive outsole below the midsole.

That is, according to the present invention, first, an insole having a conductive portion is arranged on the foot contact surface side, and an electrically conductive outsole is arranged on the grounding surface side. A shoe having a midsole disposed between and including three or more layers from the inner surface to the bottom surface of the shoe, wherein conductive yarn is attached to the midsole itself at any position of the midsole. Sewn through between its upper and lower surfaces, and said at the surface of said midsole
Conductive adhesive applied or impregnated on the seam
A contact portion is formed by, so that the contact portion on the upper surface side of the midsole is brought into contact with the conductive portion of the insole, and the contact portion on the lower surface side of the midsole is brought into contact with the outsole. According to the present invention, the present invention relates to a shoe, wherein conductivity is given from the insole to the outsole. Further, in a second aspect of the present invention, an insole having a conductive portion is arranged on the foot contact surface side, and an electrically conductive outsole is arranged on the ground contact surface side, and between the insole and the outsole. Has a midsole,
A shoe in which the inner surface or the bottom surface of the shoe is composed of three or more layers, and a notch that penetrates from the upper surface to the lower surface of the midsole is formed at an arbitrary position of the midsole. , Apply conductive material and / or
A flexible or flexible conductive sheet made of an impregnated non-woven material or a woven material is inserted, and both ends of the conductive sheet inserted through the cut are connected to the midsole.
A contact portion is formed by fixing the upper and lower surfaces of the midsole with a conductive adhesive , so that the contact portion on the upper surface side of the midsole is brought into contact with the conductive portion of the insole. Further, the present invention relates to a shoe, wherein the contact portion on the lower surface side of the midsole is brought into contact with the outsole to thereby impart conductivity from the insole to the outsole.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, the following method is adopted as means for imparting conductive performance to a non-conductive midsole material. (1) Conductive performance is imparted to the midsole material by sewing a conductive thread through an arbitrary portion of the midsole from the upper surface to the lower surface of the midsole itself,
Then, on the upper surface and the lower surface of the midsole, a contact portion is formed by applying a conductive adhesive to the seam portion on the surface of the midsole, or a soft or flexible conductive material is formed on the surface of the midsole. A contact portion is formed by stacking sheets and simultaneously sewing the conductive threads. (2) Forming a notch penetrating from the upper surface to the lower surface of the midsole at an arbitrary position of the midsole, and by inserting a flexible or flexible conductive sheet into the notch, conductivity is imparted to the midsole material, Then, contact points are formed by both ends of the conductive sheet inserted through the notches on the upper surface and the lower surface of the midsole. As described above, the method for imparting conductive performance to the midsole material is the simple method, and therefore, as the material forming the midsole, the material normally used for the midsole can be used without any limitation. This means that the thickness of the shoe sole and the shape of the shoe sole can be designed arbitrarily, and it is possible to provide a shoe with no restriction in terms of design. The midsole may have more layers depending on the function of the shoe and the design of the shoe. Further, the method of the present invention as described above is simpler in the manufacturing process than the conventional method of punching out the midsole and reinserting the punching part wound with the conductive medium or the conductive single material. Is. In addition, since it does not require as large a process as punching, it has almost no effect on the foot contact.

In addition, as described above, the conductive performance is imparted to the midsole by the conductive thread penetrating and sewn over the upper surface and the lower surface thereof, or the formation of the notch from the upper surface to the lower surface. Since this is due to the insertion of a conductive sheet, in the present invention, a conductive region can be easily formed over a wide area at any part of the bottom surface of the shoe. Further, the midsole may have at least one portion where the conductive thread is sewn through the upper surface and the lower surface of the midsole and a notch, that is, a portion where the conductive sheet is inserted. However, for example, a conductive thread is sewn at two parts corresponding to the toe part of the foot, especially the metatarsophalangeal part, and the heel part, or a notch is formed to make the conductive part conductive. By inserting the sheet, a larger area of the conductive portion can be obtained, and as a result, better conductive performance can be obtained, which is preferable. In addition, in the case of the first aspect, the adjustment of the conductive performance of the shoe sole of the shoe of the present invention is performed by the size of the portion sewn through the upper surface and the lower surface of the midsole with the conductive thread (breakage of the conductive thread). Area and sewn density) and / or the area of the contact portion formed on the seam portion of the conductive thread of the midsole (that is, the area of the applied conductive adhesive or the sewn conductive sheet). Can be performed more easily. In the case of the second aspect, the cross-sectional area of the conductive sheet to be used and the area of the contact portion at the end of the sheet can be changed.

Next, the contact portion on the upper surface side of the midsole, which contacts the conductive portion of the insole, and the contact portion on the lower surface side of the midsole, which contacts the outsole, will be further described. In the first aspect of the present invention, the seam portion of the conductive thread sewn through between the upper surface and the lower surface of the midsole, which is exposed on the surface of the midsole, is directly subjected to the conductive treatment. It can be used as a contact part that contacts the bottom and outsole. However, apply a conductive adhesive to the seam so that it has a predetermined area, or
Alternatively, when forming a contact portion by simultaneously sewing a flexible or flexible conductive sheet when sewing through the midsole with a conductive thread, the conductive performance can be improved, and its adjustment is easy, which is preferable. This method is adopted. When a conductive adhesive is used, it is applied or impregnated onto the seam of the stitched conductive thread on the surface of the midsole to make contact with the conductive thread to form a contact portion. Further, the flexible or flexible conductive sheet is laid on the surface of the midsole before being sewn with the conductive thread over the upper surface and the lower surface of the midsole, and the contact portion is formed by sewing the same at the same time as the threading. If so, the manufacturing process can be simplified. On the top and bottom of the midsole,
Of course, it is possible to form the contact portion by using either a conductive adhesive or a conductive sheet. On the other hand, in the second aspect of the present invention, the ends of the conductive sheet inserted into the notches of the midsole, which are inserted from the notches of the upper surface and the lower surface of the midsole, are the contact portions. The ends of the conductive sheet are fixed to the upper surface and the lower surface of the midsole by bonding with a conductive adhesive or sewing with a conductive thread. In the above case, it is preferable to use a conductive adhesive or a conductive thread, but since the adhesion and the sewing are performed merely to fix the conductive sheet, the usual adhesive or thread for shoe stitching is used. It is also possible to use. In any case, the contact portion on the upper surface side of the midsole is brought into contact with the conductive portion of the insole, and the contact portion on the lower surface side of the midsole is brought into contact with the outsole, thereby extending from the insole to the outsole. It gives conductivity.

As the conductive thread for sewing according to the present invention, any conductive thread such as various carbon coated threads that have been conventionally used can be used without limitation. For example, the registered trademark Thunderon manufactured by Japan Silkworm Dyeing Co., Ltd., the registered trademark Electy manufactured by Teikoku Textile Co., Ltd., and the like are preferable. Further, the conductive adhesive is, for example, EC-9650 manufactured by Sakai Chemical Industry Co., Ltd.,
An adhesive obtained by kneading conductive high-structure carbon (Ketchan black etc.) into chloroprene and dissolving it in a solvent can be used, but if it has conductivity,
It is not limited to these. Further, the conductive sheet has flexibility or flexibility, and examples thereof include those made of materials such as plastics, fibers and metals. A film type, a non-woven type, a metal thread woven type, etc. are preferable. Specifically, the conductive sheet is, for example, a conductive film material obtained by applying or kneading a conductive substance (carbon black (powder-like, fibrous), metal powder such as copper, nickel, aluminum, or metal fiber). It is selected from the group consisting of non-woven materials and woven materials coated and / or impregnated with a conductive substance (for example, conductive printing ink such as carbon ink); non-woven materials and woven materials woven with metal threads.

As the material of the midsole, those which are usually used as the material for the application can be used without limitation. Ethylene-Vinyl Acetate Copolymer (EVA) blends, such as EVA cut into desired shapes for general shoe sole formulations, compression EVA, rubber-containing EVA and EVA-containing rubber (Lavalon), and general sole polyurethane resin. It is a compound etc. Of course, the midsole of the present invention may be made of a conductive resin to which an additive such as an antistatic agent is added or a material having a slight conductivity. The material of the insole is a conventional material, for example, a non-woven fabric, a pulp-like material, the conductive treatment, for example, carbon powder, carbon fibers, metal fibers, the metal powder conductive material is applied to the material, Use of impregnated or mixed material, or JP-A-59-62
As described in No. 003, both sides of the insole material are coated and impregnated with a conductive material such as carbon ink, or only the surface of the insole material of the non-conductive material is coated with a conductive material as described above. It is also possible to sew a conductive thread such as a carbon-coated thread through the upper surface to the lower surface of the insole similarly to the midsole. It is also possible to use a cloth-shaped midsole material in which a part or all of the conductive yarn is a woven fabric or a net cloth using the conductive yarn. The conductive treatment of the insole material is not limited to a form in which the entire material is treated, but may be a form in which a part of the insole is subjected to conductive treatment, for example, a conductive thread is sewn on a part of the insole. . The material of the conductive outsole is, for example, a rubber compound such as a polyurethane resin compound or a diene rubber resin or an elastomer compound, and a conductive substance such as carbon is kneaded and contained therein. The above material is a foaming agent if necessary,
Additives such as colorants, antistatic agents, catalysts, cross-linking agents and stabilizers can be included.

Further, in order to further improve the wearing comfort of the shoe, the shoe of the present invention preferably has a structure in which a cushioning insole is further provided on the insole so as to contact the sole of the foot. For example, the back surface of the insole is made of synthetic resin foam, and the front surface of the insole is used as a support surface for supporting the front foot sole, which is laminated with a slightly conductive cloth such as natural or synthetic fiber. The conductivity of the insole is given to the material by subjecting the material to the same conductivity treatment as shown in the above insole, for example, by sewing conductive threads so that the stitches are exposed on the upper and lower surfaces of the insole. Is desirable.

The conductive shoe of the present invention, which is constructed by forming the inner surface or the bottom surface of the shoe with the insole, the midsole and the outsole as described above, can be manufactured by injection molding or adhesive molding. Examples of the manufacturing method include: -manufacturing a sacking material by sewing or adhesively integrating the shoe cover and the conductive insole, and-forming the midsole separately, and then forming the upper surface of the molded midsole. A conductive thread is sewn through between the lower surface and a conductive adhesive is applied to the seam portion on the surface to form a contact portion, or a flexible or flexible conductive sheet is laid on the surface of the midsole, Forming a contact portion by simultaneously sewing with the conductive thread, -injecting the outsole separately, -press-bonding the above-mentioned insole, midsole, and outsole member, and at that time, the mid Adhesive with, for example, a conductive adhesive so that the contact portion on the upper surface side of the sole is brought into contact with the conductive portion of the insole and the contact portion on the lower surface side of the midsole is brought into contact with the outsole. Rukoto include those produced by. Further, as another example of the manufacturing method, -manufacturing a lace material by sewing or adhesively integrating a shoe cover and a conductive insole, -manufacturing a midsole separately, and then forming a molded midsole Forming a notch penetrating from the upper surface to the lower surface of the sole, inserting a conductive sheet, and fixing both ends of the conductive sheet inserted from the notch as contact points to the midsole; Injection molding of the sole, -pressurizing and bonding the members of the insole, midsole, and outsole, and at the time of contacting the contact portion on the upper surface side of the midsole with the conductive portion of the insole. Another example is one manufactured by adhering the contact portion on the lower surface side of the midsole and the outsole with, for example, a conductive adhesive.

In addition to the usual shoe structure, the conductive shoe of the present invention is integrally molded by slush molding or injection molding, for example, for the purpose of weight reduction of the sole of the shoe. It can also be applied to shoes having a structure in which a separately molded lightweight midsole and an outsole are bonded to the lower surface of the insole. That is, as a resin for molding the covering part including the insole, a synthetic resin mixed with a conductive substance such as carbon black is used to mold the insole integrally with the covering, and especially for the insole and the covering part. In addition, a guard portion for protecting the shoe sole is also integrally formed, and on the other hand, it is separately formed, and a conductive thread is sewn through between the upper surface and the lower surface of the midsole, and the contact portion is formed as described above, or , Preparing a midsole in which a conductive sheet is inserted by forming a notch through from the upper surface to the lower surface and contact points are formed by both ends of the sheet, and a conductive outsole injection-molded separately. However, the shoe is manufactured by adhering the midsole and the outsole to the covering part including the insole.

Furthermore, the shoe having the conductive shoe sole of the present invention can be applied to various kinds of shoes without particular limitation, and for example, it can be used as work safety shoes, sports shoes, casual shoes, boots, sandals and the like. .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention, which is not intended to limit the present invention, will be described below with reference to the drawings. Example 1 FIG. 1 is a vertical sectional view from a toe part to a heel part in a conductive shoe 1 as one example of the present invention. FIG. 2 is an exploded perspective view of the conductive shoe 1 of this embodiment, and FIG. 3 is a view for explaining a portion of the midsole 4 in which the conductive thread 5 is sewn through between the upper surface and the lower surface of the midsole. is there. As shown in FIGS. 1 and 2, the conductive shoe 1 of the present embodiment is
At the bottom of the armor cover 2, there is a shoe sole composed of a member consisting of an insole 8, a conductive insole 3, a non-conductive midsole 4 and a conductive outsole 7. The midsole 4 is formed by cutting a EVA foam that absorbs impact and exerts repulsive force into a shoe sole shape. In the midsole 4, the conductive thread 5 extends between the upper surface and the lower surface of the midsole 4 at two locations, a portion corresponding to the vicinity of the metatarsophalangeal side of the foot and a portion corresponding to the heel. , Sewn through.
Contact points 47 and 48 are formed by applying a conductive adhesive 46 to the seams of the upper surface and the lower surface of the midsole 4, respectively. The contact portion 47 on the upper surface side of the midsole 4 is in contact with the insole 3 that has been made conductive, and the contact portion 48 on the lower surface side of the midsole 4 is in contact with the conductive outsole 7. Therefore, the shoe sole of the shoe 1 has a conductive structure from the insole 3 to the outsole 7 through the portion 41 sewn through with the conductive thread 5 and the contact portions 47 and 48 of the midsole.

A conductive thread 5 is sewn through the upper surface and the lower surface of the midsole 4 and contact portions 47 and 48 formed by applying a conductive adhesive 46 to the seam and the laminated structure of the shoe 1 are shown in FIG. This is made clear by the exploded perspective view of FIG. In the midsole 4 in FIG. 2, only the portion where the conductive thread 5 on the side corresponding to the toes is sewn through is shown, and the portion 41 where the conductive thread 5 on the side corresponding to the heel is sewn through is shown. Is omitted. Further, FIG. 3 shows a state in which the portion corresponding to the toes of the midsole 4 is enlarged and the conductive thread 5 is sewn through. In this case, the contact portions 47 and 48 on the upper surface and the lower surface of the midsole 4 are sewn at the same time with the conductive sheet 16 being overlapped on the upper surface and the lower surface of the midsole 4 when the midsole 4 is sewn through the conductive thread 5. Formed. As is apparent from the structure shown in FIGS. 2 and 3, the sole of the shoe 1 in this embodiment has a size of the portion 41 where the midsole 4 is sewn through with the conductive thread 5 and the midsole 4 of the midsole 4. The conductive performance can be adjusted by adjusting the size of the areas of the contact portions 47 and 48 provided on the upper surface side and the lower surface side. In this embodiment, the insole 3 is made of synthetic resin impregnated with carbon ink and is made conductive, and the outsole 7 is made of urethane resin in which carbon black is kneaded. Further, the conductive sheet 16 uses a non-woven fabric which is coated and impregnated with carbon. The insole 8 placed on the insole 3 is formed by laminating a synthetic resin foam and a woven fabric made of synthetic fibers. Further, the insole 8 is sewn with conductive threads 9 on its upper surface and lower surface so that the stitches are exposed. Through this conductive thread 9, the insole 8 and the insole 3
Conductivity is also provided between and. Note that the insole 8 is not shown in FIG. 2 as being housed in the cover 2. As described above, the means for imparting conductivity to the midsole 4 in the shoe of the present embodiment is only to provide the portion 41 where the midsole 4 is sewn through with the conductive thread 5 and the contact portions 47 and 48. Yes, insole 3
The contact portions 47 and 48 on the upper surface side and the lower surface side of the midsole 4 which are in contact with the outsole 7 are conductive adhesives 46.
Alternatively, a thin conductive sheet 16 having flexibility or flexibility
Since it is formed by, it can be seen that it does not affect the foot contact.

Example 2 A second aspect of the present invention in which the midsole 4 is provided with a notch 45 and a flexible or flexible conductive sheet 6 is inserted into the notch 45 to impart conductivity performance to the midsole 4 will be described. FIG. 4 is a vertical cross-sectional view from the toe portion to the heel portion in the conductive shoe 1 ′ according to the second embodiment of the present invention. Figure 5
6 is an exploded perspective view of the conductive shoe 1'of the present embodiment, and FIG.
FIG. 6 is a diagram illustrating a midsole 4 with a conductive sheet 6 inserted. Similar to the first embodiment, as shown in FIGS. 4 to 6, the conductive shoe 1 ′ according to the present embodiment has an insole 8 on the bottom of the garment cover 2.
(As in the case of the first embodiment, conductive thread 9 is sewn to provide conductivity), conductive insole 3, non-conductive midsole 4 and conductive outsole 7 It has a sole. Each member in this embodiment is made of the same material as in the first embodiment. The midsole 4, which is an EVA foam, is formed with a notch 45 penetrating from the upper surface to the lower surface at two portions, a portion corresponding to the vicinity of the metatarsophalangeal side of the foot and a portion corresponding to the heel, A flexible or flexible conductive sheet 6 is inserted into the cut 45. Then, the end portions of the conductive sheet 6 inserted from the upper surface of the midsole 4 and the end portions of the conductive sheet 6 inserted from the lower surface are bonded with a conductive adhesive to form contact portions 47, 48. However, the contact portion 47 on the upper surface side of the midsole 4 is in contact with the insole 3 that has been subjected to the conductivity treatment, and the contact portion 48 on the lower surface side of the midsole 4 is in contact with the conductive outsole 7. In this way, the shoe sole of the shoe 1 ′ has a conductive structure from the insole 3 to the outsole 7 via the conductive sheet 6.

The manner in which the conductive sheet 6 is inserted into the midsole 4 and the laminated structure of the shoe 1'are clarified by the exploded perspective view of FIG. In addition, in the midsole 4 in FIG. 5, the notch of the part corresponding to the heel and the conductive sheet are not shown. 6 shows a state in which the portion of the midsole 4 on the side corresponding to the toes is enlarged and the conductive sheet 6 is inserted into the midsole 4 through the notch 45. As is apparent from the structure shown in FIGS. 5 and 6, the shoe sole of the shoe 1 ′ of this embodiment has the size (cross-sectional area, contact area) of the conductive sheet 6, particularly the midsole 4. The conductive performance can be adjusted by adjusting the areas of the contact portions 47 and 48 fixed to the upper surface side and the lower surface side. As described above, in the shoe 1'of the present embodiment, as a means for imparting conductivity to the midsole 4, the midsole 4 is simply provided with the cut 45 and the conductive sheet 6 is inserted. , The contact portions 47 and 48 formed by the end portions of the conductive sheet 6 that are inserted on the upper surface side and the lower surface side of the midsole 4 that is the contact portion with the insole 3 and the outsole 7 are thin, flexible or flexible. Since it has sex, it can be seen that it does not affect the foot contact.

[0023]

According to the present invention, since the midsole itself is not subjected to any processing other than the formation of through stitches or cuts with the conductive thread in order to make it conductive, there is no limitation on the thickness of the midsole. The shoe can be manufactured by directly using the non-conductive material (general EVA or the like) having excellent cushioning property, which has been conventionally used for the midsole and the outsole, as the midsole material. Therefore, as compared with the conventional case where an additive such as an antistatic agent is added to the material itself to give conductivity to the molding resin for the sole, it is possible to provide a shoe with a thicker sole at low cost. However, it is unnecessary to study the relationship between the material properties such as moldability and adhesiveness when additives are added. That is, it is possible to freely deal with various designs and designs of conductive shoes. Further, in the shoe of the present invention, as a method for imparting conductivity to the midsole, 1) conductive thread is sewn through between the upper surface and the lower surface of the midsole, or 2) the upper surface and the lower surface of the midsole are penetrated. Since we have adopted a very simple method of making a notch and inserting a conductive sheet,
The manufacturing process also does not require a complicated process. Further, in the shoe of the present invention, since the portion that imparts conductivity to the midsole is a conductive thread or a thin flexible or flexible conductive sheet, even if it is inserted into the midsole, such as a foot contact. The desired conductive performance can be obtained without affecting the comfort of the wearer. Further, in the conductive performance of the shoe of the present invention, in the first aspect, by changing the size of the portion sewn through between the upper surface and the lower surface of the midsole and / or the area of the contact portion by the conductive thread, Further, in the second aspect, it can be easily adjusted by changing the cross-sectional area of the conductive sheet used and the area of the contact portion. Therefore, according to the present invention, it is possible to provide a shoe having conductivity which does not substantially change the design of the conventional shoe manufacturing process and has almost no limitation in design.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a conductive shoe as an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the conductive shoe of FIG.

FIG. 3 is a diagram illustrating a portion of the midsole that is sewn through the upper surface and the lower surface of the midsole with conductive threads.

FIG. 4 is a vertical sectional view of a conductive shoe as another embodiment of the present invention.

FIG. 5 is an exploded perspective view of the conductive shoe of FIG.

FIG. 6 is a diagram illustrating a portion of a midsole in which a conductive sheet is inserted into a cut.

[Explanation of symbols]

1, 1 ': conductive shoes 2: Covered 3: Insole 4: Midsole 5, 9: Conductive thread 6, 16: conductive sheet 7: Outsole 8: Insole 41: Portion sewn through with conductive thread 45: Notch 46: Conductive adhesive 47, 48: contact points

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-165202 (JP, A) JP-A 2000-102401 (JP, A) JP-A-3-102906 (JP, U) JP-B-37-9728 (JP, B1) Registered utility model 3046529 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) A43B 7 / 36,13 / 00-17/18

Claims (2)

(57) [Claims] 1. An insole having a conductive portion is disposed on the foot contact surface side, an electrically conductive outsole is disposed on the ground contact surface side, and a midsole is disposed between the insole and the outsole. A shoe having three or more layers from the inner surface to the bottom surface of the shoe, wherein conductive threads are provided on the midsole itself between the upper surface and the lower surface at any position of the midsole. Sewn through, and the
Conductive adhesion to the seam on the surface of the shoe sole
The contact portion is formed by applying or impregnating the agent.
Is, therefore, before the contact portion of the upper surface of the midsole
A shoe characterized by providing conductivity from the insole to the outsole by contacting the conductive part of the insole and further contacting the contact part on the lower surface side of the midsole with the outsole. . 2. An insole having a conductive portion is disposed on the foot contact surface side, an electrically conductive outsole is disposed on the ground contact surface side, and a midsole is disposed between the insole and the outsole. In the shoe, the inner surface or the bottom surface of the shoe is formed of three or more layers, and a cut that penetrates from the upper surface to the lower surface of the midsole is formed at an arbitrary position of the midsole. A non-woven fabric in which a conductive substance is applied and / or impregnated in the cut.
A flexible or flexible conductive sheet made of a cloth material or a woven cloth material is inserted, and both ends of the conductive sheet inserted through the cut are placed on the upper surface and the lower side of the midsole.
By fixing to the surface with a conductive adhesive , a contact portion is formed, so that the contact portion on the upper surface side of the midsole is brought into contact with the conductive portion of the insole, and further on the lower surface side of the midsole. A shoe characterized in that the contact portion is brought into contact with the outsole to impart conductivity from the insole to the outsole.