JP2010246785A - Sole structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sole structure which can keep a shock on the heel widely distributed and absorbed and make easier walking without deteriorating strength of an innersole, the rigidity of the sole against distortion or the like around the heel and the durability of sole or the like. <P>SOLUTION: In a structure of a sole 1 where a main sole 2, a midsole 3 and a shank member 4 are integrally laminated, a heel 4a, a shank part 4b and a branch part 4c are prepared in the shank member 4, and a standing wall rib 11 is formed at least in a part corresponding to the heel 4a. Then, a shock absorbing material 6 is embedded to the heel part of the midsole 3, the loss tangent of the dynamic viscoelasticity of the shock absorbing material 6 is made larger than the loss tangent of the dynamic viscoelasticity of the midsole 3. Then, slit grooves s prolonged in the longitudinal direction of the shoe are formed in both sides of the heel 4a of the shank member 4. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a technique for improving a shoe sole provided with a shock absorber on a heel part.

Conventionally, there has been known a technique that makes walking easier by providing a shock absorber on the buttock.For example, an opening such as a hole is formed at a position corresponding to the ridge of the shank laminated on the upper part of the insole. In addition, a technique (for example, refer to Patent Document 1) in which a cushion material is inserted and arranged from an open portion such as the hole, or a shock absorber is disposed at a substantially central portion of the mid-bottom collar and a collar holding member. A technique (for example, refer to Patent Document 2) in which an elastic member is disposed on an arch portion adjacent to the shock absorber is known.
Also, as the shank laminated on the upper part of the insole, by using thermoplastic resin instead of metal, forming the heel part, arch part and forefoot part integrally, and forming the side wall part around the shank A technique (for example, see Patent Document 3) is also known that has a shank function that supports the arch, an arch function that maintains the arch shape, and a heel cup function that holds the heel.

JP 9-206104 A Special table 2004-504914 Japanese Laid-Open Patent Publication No. 2005-160727

By the way, when the shank is disposed from the arch portion of the shoe to the heel portion, the material of the shank is usually a material having a certain degree of rigidity, but the above-mentioned Patent Document 1 and Patent Document When the shock absorber is provided in the flange portion as in the technique of No. 2, a hole is provided at a position corresponding to the flange portion of the shank, and the shock absorber is inserted and disposed in the hole portion, or the rod holding member is provided. It was provided as a separate body from the shank so as to avoid the position where the shock absorbing material is disposed. In a technique where a shock absorber is locally disposed near the center of the shank of the shank, the thickness and size of the shock absorber are limited and it is difficult to obtain a sufficient shock absorbing effect. Met.
In addition, when the heel holding member and the shank are separated, the shoe forming process is increased and the shape of the heel holding member is avoided so that the heel holding function of the heel holding member is insufficient. There was also.
On the other hand, when a shock absorber is provided over the entire heel portion and a shank as in Patent Document 3 is used, the function as a heel holding member and the function as a shank are sufficient as members, but the shock absorber is sufficient. This is an unfavorable product because it tends to inhibit the function as a heel holding member and the function as a shank during walking as a shoe.

  Accordingly, the present invention has a very simple configuration, and does not cause deterioration of the sole rigidity against the torsion or the like in the vicinity of the buttocks, deterioration of the durability of the sole, or the like during walking or running. It is an object of the present invention to provide a shoe sole structure that can efficiently absorb the shock applied to the footwear and that makes it easier to walk.

  To achieve the above object, the sole structure of the present invention is a sole structure in which a sole, a midsole, and a shank member are laminated in order from the bottom, and the shank member includes a shank portion corresponding to an arch portion, The branch part extending forward from the shank part and branching into a plurality of parts and the flange part connected to the rear part of the shank part are integrally formed, and standing wall ribs are formed at least around the flange part, and The shock absorbing material is locally embedded in the heel portion of the midsole, the loss tangent of the shock absorbing material is larger than the loss tangent of the midsole member, and the ridge portion of the shank member on the upper surface of the shock absorbing material The lower surface is in contact.

  The loss tangent of shock absorbers and midsole generally means that when a foam or viscoelastic body is deformed by applying stress (impact), most of the applied force is the internal elastic deformation as the storage elastic modulus. It is stored as energy and becomes a driving force for deformation recovery when it is removed by stress, but a part is consumed as frictional modulus of internal molecular structure due to strain as loss elastic modulus, and finally converted to heat The larger the internal friction, the smaller the deformation with respect to the stress and the shock absorption, and the value indicating the magnitude of the internal friction (loss elastic modulus / storage elastic modulus) is the loss tangent (Tanσ).

  The loss tangent in this application is a sample of 2 mm (impact absorption) using a dynamic viscoelasticity measuring instrument (Toyo Baldwin "Leovibron") at a frequency of 40 Hz and a temperature rising rate of 2 ° C / min. Material and midsole member) were subjected to the tensile forced vibration method, and the phase lag δ and complex elastic modulus were calculated from the load displacement with respect to the vibration displacement, and the loss tangent (Tanσ) was obtained.

  Since the loss tangent of the shock absorber is larger than the loss tangent of the midsole member, even when the shock absorber and the midsole are arranged on a substantially flat surface at the heel, Due to the impact force applied to the midsole, the deformation of the midsole is larger than that of the shock absorber, and the shock absorber embedded in the heel part of the midsole protrudes, and the shock absorber absorbs the shock applied to the shank member buttock. Since it receives directly, it becomes possible to utilize the effect of a shock absorber efficiently. The difference in loss tangent is appropriately set depending on the material and thickness of the shock absorbing material and the midsole member used, but preferably has a difference of 0.1 or more.

In the shoe sole structure of the present invention, slits may be provided in the length direction of the shoe on both sides of the shank member inside and outside the heel. By providing a slit in the flange portion of the shank member, the flange portion of the shank member is likely to be deformed by an impact, and the impact is easily transmitted by the impact absorbing material. Furthermore, when the shank member and the midsole are integrated with an adhesive or the like, or when the shank member and the upper shell are integrated to form a shoe, the shank member can be easily brought into close contact with other members, thereby improving the moldability. It becomes possible to improve.
The slits provided in the length direction of the shoe on both the inner and outer sides of the shank member may be simply slits or slits having a width of 1 to 2 mm, and the length is the length of the heel part. If it is within. If the width or length of the slit is too large, the performance as a shank member is lowered, which is not preferable.

Moreover, you may provide a convex part in the heel part lower surface of the shank member used for the shoe sole structure of this invention. The convex portion provided on the lower surface of the flange portion of the shank member is provided at a portion in contact with the shock absorbing material, and the height is preferably 5 mm or less. If the convex portion is too high, the collar portion of the shank member may be deformed due to continued use, and the shock absorbing material may be deformed at all times, which may cause a deterioration in the function of the shock absorbing material. Providing a convex part with an appropriate height makes it possible to transmit the impact of the buttocks more efficiently with the shock absorber, and the shock absorber embedded in the heel part of the midsole is slightly recessed Even if it is embedded in, it is possible to exert the function of the shock absorbing material.

Furthermore, in the shank member used in the shoe sole structure of the present invention, a punching structure with holes or the like may be used to reduce the weight, or the thickness may be partially changed within a range in which the function does not deteriorate.

The average thickness of the shank member varies depending on the resin used, but is in the range of 0.5 to 3.0 mm. The resin used is a general thermoplastic resin, for example, vinyl chloride resin, olefin resin, nylon resin, urethane resin can be used, and engineer plastic can be used to further enhance functionality. Good.

As the shock absorber, a gel material made of a thermoplastic elastomer or silicone resin made of urethane resin or acrylic resin can be used, and the type and amount used are appropriately determined according to the performance required of the shoes. Selected.

The outsole and midsole can be the same as those used for general jogging shoes and walking shoes.For example, as the outsole, it has excellent wear resistance such as natural rubber and synthetic rubber. As the midsole, a foam such as vinyl chloride resin, urethane resin, ethylene vinyl acetate copolymer, etc. can be used, as long as the loss tangent is smaller than that of the shock absorbing material used.
Further, an insertion hole for inserting the shock absorbing material is provided in the heel portion of the midsole. The diameter and depth of the insertion hole are appropriately set depending on the size of the shock absorber used. Further, the insertion hole may be a recess provided on the upper surface of the heel portion of the midsole or may be in a state of penetrating the heel portion of the midsole. The shape of the insertion hole may be circular or rectangular.

In a shoe sole having a laminated structure of a sole, a midsole, and a shank member, the shank member includes a shank portion corresponding to an arch portion, a branch portion extending forward from the shank portion and branching into a plurality of portions, and the shank. A rib part connected to the rear part of the part is integrally formed, and standing wall ribs are formed at least around the rib part, and a shock absorbing material is locally embedded in the rib part of the midsole, The loss tangent of the shock absorbing material is larger than the loss tangent of the midsole member, and the lower surface of the flange portion of the shank member is in contact with the upper surface of the shock absorbing material, so that the entire shock applied to the flange portion is interposed via the shank member. It can be applied to the shock absorber effectively, and the shock applied to the entire collar can be absorbed effectively. In addition, the rigidity against torsion and the like can be improved, and the fit can be improved.
In addition, by forming slits that extend in the length direction of the shoe on both the inner and outer sides of the heel part of the shank member, it becomes easier to transmit the impact to the shock absorber, and the adhesiveness and the like are improved so that the shoe can be molded. Further, by providing a convex portion having an appropriate height on the lower surface of the flange portion of the shank member, the impact applied to the flange portion can be efficiently transmitted by the shock absorber.

It is an exploded perspective view for showing an example of the sole structure concerning the present invention. It is a longitudinal cross-sectional view of the width direction of the heel part of a shoe sole. It is a longitudinal cross-sectional view of the shoe sole in the longitudinal direction. It is explanatory drawing which shows an example of the form of a shank member.

  The sole structure according to the present invention widely disperses the impact on the heel without deteriorating the strength of the insole, the rigidity of the sole against torsion or the like near the heel, the durability of the sole, etc. A combination of shock absorbing material embedded in the heel part of the midsole and the shank member laminated on the upper part and the shape of the shank member, which is capable of providing a sole structure that absorbs and has good fit and is easy to walk Etc.

  That is, as shown in FIG. 1, an example of the structure of the sole 1 includes a sole 2 made of a material such as natural rubber or synthetic rubber that is highly resistant to wear and the like, and a chloride having moderate flexibility. Midsole 3 molded from a material such as a foam such as vinyl resin, urethane resin, ethylene vinyl acetate copolymer, and a material that is harder and more elastic than midsole 3, such as vinyl chloride resin, olefin It is comprised as a laminated body of the shank member 4 comprised from resin, nylon-type resin, urethane-type resin, and engineer plastic etc. depending on the case.

The midsole 3 is provided with a circular insertion hole 5 at a substantially central portion of the collar portion, and the insertion hole 5 penetrates in the thickness direction of the midsole 3 and is made of urethane resin or acrylic resin. A shock absorber 6 made of a gel material such as a thermoplastic elastomer made of resin or a silicone resin is inserted, and a receiving member 7 such as a transparent resin material that supports the lower surface of the shock absorber 6 is inserted into the midsole 3. It can be mounted on the lower surface side of the.
In the present invention, in the relationship between the midsole 3 and the shock absorber 6, the shock absorber 6 has a larger loss tangent than the midsole 3. Here, the loss tangent (tan δ) is a value indicating the magnitude of internal friction (loss elastic modulus / storage elastic modulus) as described above. The smaller this is, the more elastic it is and the less the impact is absorbed. And shock absorption is increased.

In addition, by giving the above relationship between the midsole 3 and the shock absorbing material 6, even if the midsole 3 and the shock absorbing material 6 in the heel part are substantially on a flat surface or the shock absorbing material 6. Even if the side is arranged at a slightly lower position, the midsole 3 is deformed faster and larger than the shock absorber 6 due to the impact force applied to the heel during walking or running, and the heel of the midsole 3 The shock absorbing material 6 embedded in the portion is in a protruding state, and the shock absorbing material 6 directly receives the shock applied to the flange portion of the shank member 4 so that the effect of the shock absorbing material 6 can be efficiently utilized. Is possible.
In addition, it is preferable to select and use the member of the midsole 3 and the shock absorber 6 such that the difference in loss tangent between the midsole 3 and the shock absorber 6 is 0.1 or more.

  A window 10 is formed as an opening in the bottom 2 corresponding to the insertion hole 5 of the midsole 3. The receiving member 7 mounted on the lower surface of the midsole 3 and the window 10 absorb shock. The mounting state of the material 6 can be confirmed visually.

As shown in FIG. 4 (a), the shank member 4 includes a shank portion 4b corresponding to the arch portion, a branching portion 4c extending forward from the shank portion 4b, and a flange portion connected to the rear of the shank portion 4b. 4a is integrally provided, and standing wall ribs 11 are formed around the shank portion 4b and the flange portion 4a so as to rise slightly in a state of being curved upward, and slits are formed on both inner and outer sides of the flange portion 4a. A groove s is provided as a through groove. The slit groove s is likely to be deformed when the flange portion 4a of the shank member 4 is subjected to an impact, and the impact is easily transmitted by the impact absorbing material 6, and the shank member 4 and the midsole 3 are bonded to each other by an adhesive or the like. Or when the shank member 4 and the upper shell are integrated and molded as a shoe, the shank member 4 can be easily brought into close contact with other members, and the moldability can be improved. .
The slit groove s has a width of about 1 to 2 mm and a length of about the length of the flange 4a. However, the slit groove s may be simply provided with a cut.
Moreover, the thickness of the shank member 4 is changed by the place in the range of 0.5-3 mm on average.

Further, as shown in FIGS. 2 and 3, a convex portion 12 is provided on the lower surface of the flange portion 4 a of the shank member 4 so as to come into contact with the shock absorbing material 6. In this embodiment, the convex portion 12 has a height of about 1 to 3 mm to prevent a sense of incongruity due to being too high, and to prevent problems such as deformation and functional deterioration of the shock absorber 6 due to constant contact. Like to do.

  In the shoe sole structure as described above, the sole 2, the midsole 3, and the shank member 4 are laminated and integrated by adhesion or the like. Furthermore, when the upper member is attached and molded as a shoe, the presence of the shock absorber 6 cannot be confirmed from the upper side, but the presence can be confirmed through the window 10 from the bottom side. It can be confirmed that the shoe has a shoe sole structure having an impact absorbing function.

  The shock applied to the buttocks during walking or the like is applied to the shock absorber 6 through the shank member 4, but the loss tangent of the shock absorber 6 is larger than that of the midsole 3. Due to the impact force applied to the heel during traveling, the midsole 3 is more deformed than the shock absorber 6 and the impact absorbing effect of the shock absorber 6 embedded in the heel portion of the midsole 3 can be enhanced. The impact of the entire buttock can be widely dispersed and absorbed. In addition, the vertical wall rib 11 of the shank member 4 provides a hold function for the ridges, and it is not necessary to increase the size of the shock absorber 6 so much, and it is not necessary to provide an opening such as a hole in the shank member 4. For this reason, the rigidity against torsion of the entire shoe sole 1 is secured.

  Further, the slit grooves s formed on both sides of the heel part 4a of the shank member 4 make it easy to transmit the shock applied to the heel part to the shock absorber 6, and when integrating the instep and the shoe sole covered with the shoe mold. Moreover, since the heel part 4a becomes easy to adapt to the shoe mold, the shoe moldability can be improved.

  By the way, as shown in FIG. 4B, the shank member 4 is provided with a punch hole h at an appropriate position within a range not impairing the function of the shank member 4, thereby reducing the weight of the previous shank member 4. Can be achieved.

In addition, this invention is not limited to the above embodiments. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the material of the midsole 3 or the shank member 4 is arbitrary.

  Since the shock absorbing function of the shock absorbing material disposed on the heel of the midsole of the shoe sole can be effectively demonstrated, it is easy to walk, less fatigue, and can have a highly durable shoe sole structure. .

DESCRIPTION OF SYMBOLS 1 ... Shoe sole, 2 ... Outsole, 3 ... Midsole, 4 ... Shank member, 4a ... Ridge part, 4b ... Shank part, 4c ... Branching part, 6 ... Shock absorber, 11 ... Standing wall rib, 12 ... Convex part , S ... slit groove.

Claims (3)

A sole structure in which a sole, a midsole, and a shank member are laminated in order from the bottom, wherein the shank member is a shank portion corresponding to an arch portion, and extends forward from the shank portion and branches into a plurality of pieces. A branch part and a flange part connected to the rear part of the shank part are integrally formed, and standing wall ribs are formed at least around the flange part, and shock absorption is locally absorbed in the flange part of the midsole. A shoe sole structure in which a material is embedded, a loss tangent of the shock absorbing material is larger than a loss tangent of the midsole member, and a bottom surface of the shank member is in contact with an upper surface of the shock absorbing material. The shoe sole structure according to claim 1, wherein slits are provided in the length direction of the shoe on both inner and outer sides of the shank member. The shoe sole structure according to claim 1 or 2, wherein a convex portion is provided on a lower surface of the heel portion of the shank member.

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