JP2019150426A - Heat insulation insole - Google Patents

Abstract

To provide a heat insulation insole that can improve workability in a job site where heat transmission to the sole of a foot is concerned, that can reduce a load on the feet, and that enables continuous work for a prolonged period.SOLUTION: The heat insulation insole 10R is used, with the sole of a foot in contact therewith. The insole includes: a heat insulation cork material layer 11 in which the periphery in a region corresponding to the middle foot part and the rear foot part of the foot is erected on the front side and in which a wall shaped peripheral rising part 11W is formed; and a cushioning urethane layer 12 which is adhered by pressing to the surface part of the cork material layer 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an insole for heat insulation.

  In road pavement work sites, heat-resistant safety shoes having high heat insulation performance are used as work shoes. Because, in road paving work, especially asphalt paving work, it is necessary to work at a high temperature before the asphalt for paving cools and solidifies, but after asphalt has passed about 20 minutes immediately after paving The temperature is about 100-120 ° C.

  As a heat-resistant safety shoe, a rubber-bottomed shoe having an excellent heat insulating effect (heat resistance) is already known (for example, see Patent Document 1). In addition, dedicated safety shoes with attached insole are also available on the market.

  In addition, as an insole characterized by a heat insulation effect, flat type cold insulation (warming) has been mainstream so far, and it has been ensured warmth in cold regions (for example, patent documents) 2).

  Further, as an insole, a flat insole structure for a shoe using a cork material as a core material has been proposed so far (see, for example, Patent Document 3).

JP 2004-201768 A JP 2001-299409 A Japanese Patent Laid-Open No. 10-234417

  However, conventional insoles have been mainly flat type, even if a cork material is used for the core material. For this reason, there has been a problem that the feet are easily fatigued due to a change in the position of the feet in the shoes due to slipping, including those for cold protection.

  Foot fatigue significantly deteriorates workability on site, such as when working continuously over a long period of time.

  The present invention can improve workability at the site where heat transfer to the sole of the foot is a concern, can reduce the burden on the foot, and can easily perform continuous work for a long time. It aims at providing the insole for heat insulation.

The present invention is an insole for heat insulation used in a state in which the sole side of the foot is in contact,
A cork member formed by raising a peripheral edge of a region corresponding to the middle foot portion and the rear foot portion of the foot;
And a cushion member that is pressure-bonded to the surface portion of the cork member.

  That is, the heat insulating insole according to the present invention is used in a shoe with the back side of the foot in contact with the heat resistant cork member formed by raising at least a part of the periphery. In addition, the laminated structure with the cushion member pressure-bonded to the upper surface of the cork member is configured to ensure high heat insulation and cushioning properties as well as weight reduction.

  Moreover, the insole for heat insulation retains the position of the foot by raising the peripheral edge of the cork member, suppresses changes due to slipping of the position of the foot within the shoe, and the cushion member maintains the three arches of the sole By forming with an uneven shape, the burden on the foot and fatigue are reduced.

  In addition, the insole for heat insulation is formed by heat-pressing a reinforcing sheet made of a heat-retaining nonwoven fabric or urethane sponge sheet on the entire back surface side of the cork member so that the shape of the cork member is maintained and the cork member is lost. It can be protected (reinforced).

  As described above, according to the present invention, the peripheral edge of the region corresponding to the rear foot part from the middle foot part of the sole of the cork member is formed by compression, and is further formed on the cork member. Since the cushion member is arranged, it is possible to easily improve the heat insulation effect and suppress the change in the position of the foot in the shoe due to slipping, even in a harsh work site, while being lightweight. In addition to reducing the burden on the foot, it is possible to provide an insole for heat insulation that does not fatigue the foot even after long hours of continuous work.

  In particular, heat transfer to the sole (sole) is not limited to heat transmission, but for example, the transmission of cold to the sole can also be insulated (also called cooling). Greatly improves workability in harsh work sites.

It is a schematic block diagram which shows the case where the insole for heat insulation which concerns on one Embodiment of this invention is used for paving construction shoes. It is a schematic perspective view for demonstrating the relationship between the insole for heat insulation, the safety shoes for pavement construction, and a foot skeleton. It is a schematic side view for demonstrating the relationship between the insole for heat insulation, the safety shoes for pavement construction, and a foot skeleton. It is a schematic perspective view for demonstrating a foot skeleton. It is a schematic side view for demonstrating a foot skeleton. It is a schematic bottom view for demonstrating the relationship between the insole for heat insulation, and a foot skeleton. It is a schematic plan view which shows an example of the insole for heat insulation. It is a schematic sectional drawing of the length direction of the insole for heat insulation shown in FIG. It is a schematic sectional drawing of the width direction of the insole for heat insulation shown in FIG. It is a schematic bottom view which shows an example of the insole for heat insulation. It is a schematic (inner) side view which shows an example of the insole for heat insulation. It is a schematic (outside) side view which shows an example of the insole for heat insulation. It is the schematic which shows the result simulated for demonstrating the temperature characteristic of the insole for heat insulation. It is the schematic which shows the result of the simulation performed in order to demonstrate the temperature characteristic of the insole for heat insulation. It is a schematic block diagram which illustrates the insole for heat insulation which concerns on other embodiment of this invention. It is a schematic perspective view which illustrates the insole for heat insulation which concerns on another embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment>
FIG. 1 shows a configuration example of an insole for paving construction shoes to which an insole for heat insulation according to this embodiment is applied. 1A is a schematic perspective view of the front (upper surface) side of the insole for paving shoes, and FIG. 1B is a schematic cross-sectional view along the line bb in FIG. 1A. is there. The insole for paving construction shoes is used in a state of being inserted into work shoes such as paving construction safety shoes described later, and is usually used as a pair for left foot and right foot. Since the structure is substantially the same (right / left symmetrical), an insole 10R for paving construction shoes for the right foot (RF) will be described as an example here.

  As shown in FIGS. 1 (a) and 1 (b), the insole 10R for paving construction shoes is a cork material layer 11 (also referred to as a compressed cork material) having substantially the same shape as the sole surface, also referred to as a sole. The cork material layer 11 includes, for example, a urethane layer 12 (also referred to as a compressed urethane material) that is thermocompression bonded to the upper surface (surface portion) side.

  As the cork material layer 11, for example, a compressed cork material (pressed cork) obtained by compressing and molding a crushed cork oak bark together with an adhesive into a thin plate shape is used.

  The insole for paving shoes 10R has a flat shape (flat plate) in which the region corresponding to the front foot portion and the rear foot portion of the sole, which will be described later, on the lower surface of the cork material layer 11 is flat on the back surface portion 10B side. Shape). The insole for paving shoes 10R is provided with a wall-like peripheral upright portion 11W at the peripheral portion of at least the region corresponding to the middle foot portion and the rear foot portion of the sole (described later). The peripheral upright portion 11 </ b> W has a maximum height of about 15 mm from the bottom surface on the back surface portion 10 </ b> B side, for example, due to the cork material layer 11 and the urethane layer 12.

  On the other hand, the pavement shoe insole 10R has a flat planar shape on the surface portion 10S side corresponding to the front foot portion of the sole on the upper surface of the urethane layer 12. Further, an uneven shape (convex shape portion 12S) for holding the three arches of the sole is provided on the surface portion 10S side of the insole 10R for paving construction shoes, and the sole is provided in a region corresponding to the rear foot portion. A heel cup portion 10C (concave portion) for holding the heel portion is provided (details will be described later).

  Of the three arches on the sole, the convex shape portion 12S includes a lateral arch convex portion 12SA substantially corresponding to a lateral arch described later, an inner vertical arch convex portion 12SB substantially corresponding to an inner vertical arch described later, and a later described. And an outer vertical arch convex portion 12SC substantially corresponding to the outer vertical arch. In addition, the convex part 12SA for horizontal arches is made into the predetermined | prescribed shape whose height from the bottom face by the side of the back surface part 10B of the insole 10R for pavement construction shoes is about 10 mm at the maximum.

  That is, in the insole for paving shoes 10R of this embodiment, the cork material layer 11 constitutes a heat-resistant cork member (core material), and the urethane layer 12 constitutes a cushion member (soft synthetic resin layer). ing.

  And in this insole 10R for pavement construction shoes, the nonwoven fabric 13 as a reinforcing sheet is further thermocompression bonded to the lower surface (bottom surface) side of the cork material layer 11. The nonwoven fabric 13 has heat retaining properties and is provided for maintaining the shape of the cork material layer 11, and particularly prevents the edge portion of the peripheral upright portion 11W from being lost. As the material for the nonwoven fabric 13, for example, natural materials such as cotton, hemp and wool, synthetic fibers, regenerated fibers, pulp, polyester and the like are used. Further, a urethane sponge sheet may be employed instead of the nonwoven fabric 13.

  On the other hand, on the entire surface of the urethane layer 12, a surface layer member 14 having quick drying properties is thermocompression bonded. As the surface layer member 14, a stopper material (for example, a mesh sheet) that has a large static frictional force with socks or the like and is difficult to slip is used. A member having a deodorizing effect or an antibacterial effect can be employed as the surface layer member 14.

  According to the insole 10R for paving shoes according to the present embodiment, the laminated structure of the cork material layer 11 and the urethane layer 12 can reduce the weight, and the cork material layer 11 can provide high heat insulation as the insole 10R for paving shoes. An effect (insulation property) can be secured.

  In addition, the convex shape portion 12S can sufficiently support the three arches of the sole, and can appropriately suppress changes due to slipping of the foot position in the shoe by the heel cup portion 10C and the peripheral upright portion 11W. As a result, it is possible to effectively reduce the burden on the foot and fatigue.

  Therefore, it is possible to improve workability in a harsh site where there is a concern about the transfer of heat to the sole, and it is possible to perform continuous work for a long time easily.

  Moreover, since the cork material layer 11 is protected by the nonwoven fabric 13, it is possible to prevent the peripheral upright portion 11W from being deformed or the cork material layer 11 from being lost.

  Further, in the insole 10P for paving shoes of the present embodiment, the peripheral upright portion 11W is also laminated with the cork material layer 11 and the urethane layer 12 as shown in an enlarged main portion 11Wex in FIG. By adopting the structure, it is possible to effectively suppress heat sneaking around the sole.

  In the following description, with respect to the heel cup portion 10C, the peripheral upright portion 11W in the region corresponding to the inner side (thumb side) of the foot is also referred to as the inner peripheral upright portion 11WI, and corresponds to the outer side of the foot (small finger side). The peripheral upright portion 11W of the area to be performed is also referred to as the outer peripheral upright portion 11WO (see, for example, FIG. 6).

  Here, the relationship among the insole 10R for paving shoes, the safety shoes AS for paving works, and the foot skeleton FB will be described.

  FIG. 2 is a schematic perspective view showing a state where the safety shoes AS for pavement work are worn as an example for the right foot RF, and FIG. 3 is a schematic side view thereof. 2 and 3, the paving shoe insole 10 </ b> R and the foot skeleton FB of the right foot RF are shown in a state of passing through the paving safety shoe AS. 4 and 5 both show the foot skeleton FB. FIG. 4 is a schematic perspective view showing the three arches of the sole FT taking the right foot RF as an example, and FIG. 5 is a schematic showing the foot skeleton FB of the right foot RF. It is a side view. FIG. 6 is a schematic bottom view for explaining the relationship between the insole for paving shoes 10R and the sole FT of the foot skeleton FB.

  As shown in FIGS. 2 and 3, the insole 10P for pavement construction shoes according to the present embodiment is inserted into a pavement safety shoe AS having a leather upper 20, for example, and faces the surface portion 10S side. The back surface 10B side is mounted so as to be along the insole 22 of the paving safety shoe AS. The insole 10R for pavement construction shoes is used in a state where it can be attached to and detached from a commercially available safety shoe AS for pavement construction. The pavement safety shoes AS has a flat sole 21 that is in contact with the pavement surface, for example, so as not to leave an extra shoe mark on the pavement surface on which asphalt is paved. It is formed by a rubber bottom. The rubber bottom has a moderate heat resistance effect.

  Then, when an operator who is a practitioner wears the pavement construction safety shoes AS, the soles FT of the workers are attached to the surface portion 10S of the insole 10P for pavement construction shoes via socks (not shown). Abutted. Thereby, the insole 10R for paving shoes functions as an insole for heat insulation, and it becomes possible to secure a further heat insulation performance coupled with the heat resistance effect of the shoe sole 21 (details will be described later).

  Next, the name of each part of the foot skeleton FB will be described.

  As shown in FIGS. 4 and 5, the foot skeleton FB includes a forefoot portion 120, a middle foot portion 122, and a hindfoot portion 123. In this embodiment, an anatomical name is not used, but a description is given using a name used in the manufacturing industry such as a prosthetic limb prosthesis. Further, here, the portion from the ankle to the tip (toe side) is referred to as “foot”, and the right foot RF is illustrated.

  As shown in FIGS. 4 and 5, the forefoot portion 120 includes a first distal phalanx 127, a second distal phalanx 128, a third distal phalanx 129, a fourth distal phalanx 130, a fifth distal phalanx 131, and a middle phalanx. 135, 136, 137, 138, the first proximal phalanx 141, the second proximal phalanx 142, the third proximal phalanx 143, the fourth proximal phalanx 144, and the fifth proximal phalange 145.

  As shown in FIGS. 4 and 5, the metatarsal part 122 includes a first metatarsal 151, a second metatarsal 152, a third metatarsal 153, a fourth metatarsal 154, and a fifth metatarsal 155. And the first wedge-shaped bone 161, the second wedge-shaped bone 162, the third wedge-shaped bone 163, the cubic bone 171, and the boat-shaped bone 173.

  The connecting portion between the forefoot portion 120 and the middle foot portion 122 is referred to as a stepping portion 126. As shown in FIGS. 4 and 5, the stepping portion 126 includes a first proximal phalanx 141, a second proximal phalanx 142, a third proximal phalange 143, a fourth proximal phalanx 144, and a fifth proximal phalanx. 145 from the vicinity of the bone bottom and from the vicinity of the heads of the first metatarsal bone 151, the second metatarsal bone 152, the third metatarsal bone 153, the fourth metatarsal bone 154, and the fifth metatarsal bone 155. It is a range.

  That is, the forefoot portion 120 is a range from the tip of the foot to the vicinity of the center of the stepping portion 126. Accordingly, the vicinity of the center of the stepping portion 126 is also referred to as a rear end of the forefoot when viewed from the forefoot 120. Further, the middle foot portion 122 is a range from the vicinity of the center of the stepping portion 126 to the tip of the rear foot portion 123. Therefore, the vicinity of the center of the stepping portion 126 is also referred to as a middle foot portion tip when viewed from the middle foot portion 122.

  As shown in FIGS. 4 and 5, the hind leg portion 123 is a range composed of a talus 175 and a rib 177.

  As shown in FIG. 4, the foot is to keep firmly the arch structure (the three arches 188 of the sole FT) composed of the lateral arch 181 of the foot skeleton FB, the inner longitudinal arch 183 and the outer longitudinal arch 186. is important.

  The lateral arch 181 is a rising line (also referred to as a lateral arch line) connecting the first metatarsal bone 151, the second metatarsal bone 152, the third metatarsal bone 153, the fourth metatarsal bone 154, and the fifth metatarsal bone 155. It is.

  The medial longitudinal arch 183 is a rising line (also referred to as medial longitudinal arch line IA) connecting the first metatarsal bone 151, the first wedge-shaped bone 161, the scaphoid bone 173, the talus 175, and the rib 177.

  The outer longitudinal arch 186 is a rising line (also referred to as an outer longitudinal arch line OA) connecting the fifth metatarsal bone 155, the cubic bone 171 and the rib 177.

  In addition, as shown in FIG. 6, in the sole FT, the base of the toe of the stepping portion corresponding region 226 corresponding to the stepping portion 126 (near the head of the first metatarsal 151) On the other hand, the base of the little toe of the foot (near the head of the fifth metatarsal 155) is referred to as “small ball LB”. Further, the inner side refers to the thumb side of the foot and the outer side refers to the little finger side of the foot.

  The insole 10R for pavement construction shoes of the present embodiment is, for example, near the extension line of the cc line connecting the main centers of the main ball MB and the small ball LB used for measuring the foot circumference (around the foot width). Furthermore, the inner peripheral edge rising position 11WIS of the inner peripheral edge rising part 11WI in the peripheral rising part 11W and the outer peripheral rising position 11WOS of the outer peripheral edge rising part 11WO are designed to correspond to each other.

  In FIG. 6, the insole 10 </ b> R for paving shoes comes into contact with the sole FT of the worker as the safety shoes AS for paving work is attached. Accordingly, during the work, a region 220 (forefoot corresponding region) corresponding to the forefoot 120, a region 222 (mediumfoot corresponding region) corresponding to the middlefoot 122, and a region 223 corresponding to the rearfoot 123 The foot sole FT is held as a whole by (the rear foot corresponding region).

  In particular, the lateral arch 181 of the three arches 188 of the sole FT is mainly convex by the lateral arch convex portion 12SA of the convex-shaped portion 12S that trims the lateral arch 181 and the inner vertical arch 183 is mainly trimmed by the inner vertical arch 183. The outer vertical arch 186 is held by the outer vertical arch convex portion 12SC of the convex shape portion 12S that mainly adjusts the outer vertical arch 186 by the inner vertical arch convex portion 12SB of the shape portion 12S. Thereby, the shape of the sole FT can be sufficiently supported by the insole for paving shoes 10R. Therefore, even if the work is performed for a long time, it is possible to suppress the burden on the operator's foot and fatigue, and to keep the three arch 188 of the sole FT always in a good state.

  The heel portion of the foot is held by the heel cup portion 10C of the insole 10R for paving shoes. Further, the inner portion of the right foot RF is mainly held by the inner peripheral edge rising portion 11WI of the peripheral edge standing portion 11W, and the outer portion of the right foot RF is mainly held by the outer peripheral edge rising portion 11WO of the peripheral edge rising portion 11W. Thereby, in the safety shoes AS for pavement construction, it is possible to suppress a change in position such as a positional shift such that the operator's foot slides in the horizontal direction or the vertical direction. Accordingly, it is possible to reduce the burden on the operator's feet and fatigue even when working for a long time.

  Moreover, according to the insole 10R for pavement shoes, the sole FT of the worker who is working is effectively protected from high-temperature heat, compared to the case where only the safety shoes AS for the pavement work in which the shoe sole 21 is a rubber bottom. become able to. Therefore, it is possible to improve work efficiency in pavement work such as roads, and workability can be improved.

  Next, the insole 10R for pavement construction shoes according to the present embodiment will be further described with reference to FIGS.

  That is, FIG. 7 is a schematic plan (top) view showing an example of an insole 10R for paving shoes for the right foot RF, and FIG. 8 is an insole 10R for paving shoes along the line rr shown in FIG. It is a schematic sectional drawing of the length direction. 9 is a schematic cross-sectional view in the width direction of the insole 10R for paving shoes. FIG. 9A shows a cross section taken along the line ss of FIG. 7, and FIG. FIG. 9C shows a cross section taken along the line t-t, and FIG. 9C shows a cross section taken along the line u-u in FIG.

  7 to 12, If indicates the front (toe) side of the paving shoe insole 10R, Ib indicates the rear (heel) side, Ii indicates the inside of the paving shoe insole 10R, and Io indicates the inner side of the insole 10R. On the outside, Is indicates the front surface (10S) side of the paving shoe insole 10R, and Iu indicates the back surface (10B) side.

  FIG. 10 is a schematic bottom (bottom) view showing an example of an insole 10P for paved construction shoes for the right foot RF, FIG. 11 is a schematic side view of the inside, and FIG. 12 is a schematic side view of the outside. It is.

  However, in FIGS. 7 and 8, the region corresponding to the forefoot portion 120 of the right foot RF shown in FIG. 6 is defined as the forefoot portion corresponding region 220, and the region corresponding to the middle foot portion 122 of the right foot RF is associated with the middle foot portion. The region corresponding to the rear foot 123 of the right foot RF will be described as the rear foot corresponding region 223. Further, in the middle foot corresponding region 222 and the rear foot corresponding region 223 shown in FIG. 6, the inner peripheral rising portion 11WI is defined as the inner peripheral rising portion 11WI inside the right foot RF, and the middle foot corresponding region 222 and the rear foot portion. In the corresponding region 223, the outer peripheral upright portion 11W outside the right foot RF will be described as an outer peripheral upper peripheral portion 11WO.

  In the figure, “11WIS” is an inner peripheral rising position indicating the start position of the inner peripheral rising portion 11WI, and “11WOS” is an outer position indicating the starting start position of the outer peripheral rising portion 11WO. The peripheral rising position. In FIG. 7, “CA” is a central vertical arch line, “IA” is an inner vertical arch line, and “OA” is an outer vertical arch line. “Sa” in the figure indicates, for example, the position of the top of the convex part 12SA for the horizontal arch on the horizontal arch line (not shown), and “Sb” in the figure indicates the surface of the insole 10R for paving shoes. Regions of particularly low hardness in the part 10S are shown respectively.

  As shown in FIGS. 7 to 12, the insole for paving shoes 10 </ b> R according to the present embodiment is particularly suitable when used as an insole for paving work safety shoes AS, for example.

  That is, as shown in FIGS. 7 to 9, the insole 10R for paving construction shoes of the present embodiment uses the cork material layer 11 as a core material, and the peripheral edges of the middle foot corresponding region 222 and the rear foot corresponding region 223. A peripheral upright portion 11 </ b> W formed by raising the portion to the surface portion 10 </ b> S side is provided. Further, the insole 10R for pavement construction shoes includes a cushioning urethane layer 12 on the surface portion 10S side, and has a convex-shaped portion 12S that can reduce the load on the foot and can eliminate excessive fatigue.

  The convex portion 12SA for the lateral arch of the convex shape portion 12S is for adjusting the lateral arch 181 of the sole FT shown in FIG. 4, and mainly a stepping portion corresponding to the stepping portion 126 of the sole FT. The height of the top portion Sa that fits the rear portion of the corresponding region 226 is a predetermined shape of about 10 mm.

  The convex portion 12SB for the inner vertical arch of the convex portion 12S is for adjusting the inner vertical arch 183 of the sole FT shown in FIG. 4 and is mainly formed on the inner portion (arch portion) of the sole FT. It has a predetermined shape that fits.

  The convex portion 12SC for the outer vertical arch of the convex shape portion 12S is for adjusting the outer vertical arch 186 of the sole FT shown in FIG. 4 and mainly fits the outer side of the sole FT or an arch portion. The shape is predetermined.

  As shown in FIG. 8 and FIG. 9, the horizontal arch convex part 12 SA, the inner vertical arch convex part 12 SB, and the outer vertical arch convex part 12 SC of these convex shaped parts 12 S are smooth curved surfaces (concave parts). Are connected.

  In the insole 10R for paving shoes of the present embodiment, the hardness of the region (Sb) at least between the convex portion 12SA for the horizontal arch and the convex portion 12SB for the inner vertical arch, which is a smooth curved surface, is the horizontal arch. For example, the measured value by a C hardness meter is about 21 to 24 degrees, which is lower than the hardness of the convex portion 12SA and the convex portion 12SB for the inner vertical arch.

  That is, on the surface portion 10S of the insole 10R for pavement construction shoes, a region Sb having a lower hardness than the other regions is disposed between the lateral arch convex portion 12SA and the inner vertical arch convex portion 12SB. As described above, by arranging the low-hardness region Sb in a portion substantially corresponding to the inner vertical arch line IA, the buffering effect at the time of shock absorption can be improved.

  The peripheral upright portion 11W substantially corresponds to the middle foot portion 122 and the rear foot portion 123, the inner peripheral upright portion 11WI mainly holding the inside of the right foot RF, and the outer peripheral upright portion 11WO mainly holding the outside of the right foot RF. And have. Both the inner peripheral edge rising portion 11WI and the outer peripheral edge rising portion 11WO have a predetermined shape having a maximum position (total height) of about 15 mm.

  As shown in FIG. 8, the cork material layer 11 is flat on the front surface of the front foot corresponding region 220 and the entire back surface of the front foot corresponding region 220, the middle foot corresponding region 222, and the rear foot corresponding region 223. In addition, the nonwoven fabric 13 is pressure-bonded to the entire back surface. Thereby, while keeping heat retention, the cork material layer 11 is lost, and it is possible to protect (reinforce) the peripheral upright portion 11W becoming shabby or deforming the peripheral upright portion 11W itself during use.

  As shown in FIGS. 2 and 3, the insole for paving shoes 10R having such a configuration generally has a size and a shape corresponding to the insole 22 of the paving safety shoes AS. For example, as shown in FIGS. 10 to 12, the insole 10R for pavement shoes has a total length (longitudinal dimension La) corresponding to the foot length of about 270.0 mm. The total width (lateral dimension Wa) is about 93.0 mm, the thickness (Ha) is at least about 5.5 mm, and the total height (Hb) is about 15.0 mm.

  For example, as shown in FIG. 11, the inner peripheral edge rising portion 11 </ b> WI gradually rises starting from the vicinity of the inner peripheral edge rising position 11 WIS in the vicinity of the main ball MB, and in the rear foot corresponding region 223, It is formed to have the same height.

  For example, as shown in FIG. 12, the outer peripheral edge rising portion 11WO gradually rises starting from the vicinity of the outer peripheral edge rising position 11WOS in the vicinity of the small ball LB, and in the rear foot corresponding region 223, It is formed to have the same height.

  As shown in FIGS. 11 and 12, the inner peripheral edge rising portion 11 </ b> WI and the outer peripheral edge rising portion 11 </ b> WO gradually rise and are not limited to having a generally gentle shape, but near or outside the inner peripheral edge rising position 11 WIS. A shape that rises sharply starting from the vicinity of the peripheral rising position 11WOS may be used (for example, see FIG. 3).

  FIG. 13 shows the result of the simulation for explaining the temperature characteristics of the insole 10R for paving shoes according to the present embodiment with respect to the high temperature heat in comparison with the comparative example. FIG. 13 (a) shows the heating time. FIG. 13B is a graph showing changes in the surface temperature according to the heating time. FIG.

  In this simulation, a dedicated safety shoe (not shown) with an attached insole is used, and the attached insole is attached as a comparative example (for example, VR235 manufactured by Midori Safety Co., Ltd.) It compared with the case where the prototype of the insole 10R for pavement construction shoes which concerns on embodiment is mounted | worn. As a prototype, for example, a non-woven fabric for reinforcement, a 3 mm thick heat insulating cork sheet (CORK 3 mm), a cushioning material (VF150), and Saraki (trade name, CS0902C # 101) are laminated and pressed in order from the bottom. Using.

  In the simulation, a safety shoe is placed on a metal plate with a surface temperature of 150 ° C. so that the shoe sole comes into contact, and a surface thermometer (for example, ID-1100E manufactured by Anritsu Keiki Co., Ltd.) is used, The surface temperature in the vicinity was measured at intervals of 5 minutes until 20 minutes passed from the start of heating. In addition, as a reference example, the case where no insole was attached (indicated by x in FIG. 13) was also measured. The unit of the surface temperature is ° C.

  As a result of the simulation, as shown in FIGS. 13 (a) and 13 (b), a prototype of the insole 10R for pavement construction shoes according to this embodiment (in the drawing) is shown with respect to the comparative example (indicated by Δ in the drawing). The heat insulation effect of 6 to 7 ° C. on average was recognized in the case of (indicated by ●).

  Also, a prototype different from the prototype used in the above-mentioned simulation (for example, a reinforcing non-woven fabric, a 3 mm thick heat insulating cork sheet (CORK 3 mm), a cushioning material (VF100), Saraki (trade name, CS0902C # 101)) Is fitted to safety shoes (for example, ISA-805 manufactured by Midori Safety Co., Ltd.) from which the attached insole (Kanoko fabric + EVA cup insole) is removed, fit, grip, cushioning, and fatigue resistance The experiment was conducted. As a result, compared to the attached insole, generally, the case where the prototype was mounted was superior in fit, grip and cushion, and high evaluation that it was difficult to get tired even after prolonged use was obtained.

  In this experiment, the cork sheet was not broken or lost, and sufficient durability could be confirmed.

  As described above, according to the insole for paving construction shoes of the present embodiment, by adopting a laminated structure with a compression urethane material using a compression cork material as a core material, with a high heat insulation effect, weight reduction and cushioning properties are achieved. Further improvement is achieved.

  That is, a cork material layer is used as a core material of a detachable pavement construction insole used in a state of wearing in safety shoes, and a peripheral edge of a region corresponding to a middle foot portion and a rear foot portion of the cork material layer Is provided with a peripheral upright portion that is raised on the surface side, and a urethane layer as a cushion member is provided on the upper surface of the cork material layer. As a result, sufficient cushioning properties for the sole can be secured, and heat transfer from the paved surface such as asphalt to the sole of the operator can be sufficiently suppressed. Therefore, the sole of the worker who is working can be effectively protected from the high-temperature heat of the asphalt where the temperature after about 20 minutes has passed since the pavement is about 100 to 120 ° C.

  Further, since the middle foot portion and the rear foot portion of the foot can be firmly fixed by the peripheral upright portion, it is possible to suppress the displacement and slipping of the foot in the shoe while being lightweight. In addition, since the urethane layer has an uneven shape, it is possible to effectively support the three arches on the soles with appropriate cushioning properties, and to reduce the burden on the feet and fatigue.

  As a result, work efficiency in paving work such as roads can be improved, such as enabling continuous work over a longer time, and workability on the site can be greatly improved.

  Moreover, since the cork material layer can be reinforced by forming a non-woven fabric on the lower surface of the cork material layer, the shape of the peripheral upright portion can be easily maintained. It is possible to easily protect the cork material layer from defects such as cracks and cracks.

  Further, when a surface layer member having quick drying properties is provided, it is possible to always ensure a comfortable fit and an appropriate grip property as well as a smooth comfort.

  In the above-described embodiment, the insole for paving shoes has been described as an example. However, the insole is not limited to paving shoes, but for example, rubber boots (work shoes) having a flat shoe sole also called a rubber length. Is also applicable.

  In particular, the heat insulating insole of the present embodiment can be applied to various types of work shoes used when working on sandy beaches, poolside concrete surfaces, and roofs, which tend to be hot in summer.

  The insole for heat insulation of this embodiment is suitable for use in harsh sites where transmission of high-temperature heat from the feet is a problem, such as in dangerous workshops and factories when molten glass or castings are scattered on the floor surface. is there.

  In addition, the heat insulating insole of this embodiment is not limited to the case where the transmission of high-temperature heat from the feet is a problem, but the transmission of cold from the feet, such as on snow or ice, is a problem, for example, snow shoveling or snow grazing The present invention can also be applied to sports scenes such as snow removal work such as winter mountain climbing, smelt fishing on frozen lakes and ice competition, or work shoes for cutting ice or working in a freezer.

  FIG. 14 shows the result of simulation for explaining the temperature characteristics with respect to the cooling of the heat insulating insole according to the present embodiment, and FIG. 14 (a) tabulates and shows the change of the surface temperature for each cooling time. FIG. 14B is a graph showing changes in the surface temperature according to the cooling time.

  14A and 14B, the prototype of the insole used in the simulation shown in FIG. 13 is placed in a commercially available boot (not shown) with an insole (in the figure, ● And a case without an insole with only boots (indicated by x in the figure). The unit of the surface temperature is ° C.

  14 (a) and 14 (b) show, for example, that a boot is placed on a cooling body for cooling (not shown) (surface temperature is about −13.1 ° C.) so that the shoe sole is in contact with the surface. It is the result of measuring the surface temperature in the vicinity of the stepped portion corresponding region of the insole at intervals of 5 minutes from the start of cooling using a thermometer (for example, ID-1100E manufactured by Anritsu Keiki Co., Ltd.).

  In the case with the insole, a higher cooling effect (warming) was recognized for the transmission of cold than in the case of boots only (without the insole).

  Further, as an insole 10P for paving construction shoes according to another embodiment, at least a portion of the peripheral upright portion 11W that is strongly in contact with the foot, such as a main portion 11Wex shown enlarged in FIG. It is also possible to have a single layer structure only.

  Furthermore, as an insole 10P for paving shoes according to another embodiment, for example, as shown in FIG. 16, an insole for an underground socks (work shoes) in which a thumb and other fingers are divided into two parts by a cut 19 It is also possible to do.

10R Pavement shoe insole 11 Cork material layer 11W Periphery standing upper part 11WI Inner peripheral edge rising part 11WIS Inner peripheral edge rising part 11WO Outer peripheral edge rising part 11WOS Outer peripheral edge rising part 12 Urethane layer 12S Convex part 13 Nonwoven fabric 14 Surface layer member 120 Forefoot Part 122 Middle foot part 123 Rear foot part 188 Three arches 220 of soles Forefoot part corresponding area 222 Middle foot part corresponding area 223 Rear foot part corresponding area 226 Stepping part corresponding area AS Pavement safety shoes FB Foot skeleton FT Foot sole

Claims (4)

An insole for heat insulation used in a state where the back side of the foot is in contact,
A cork member formed by raising a peripheral edge of a region corresponding to the middle foot portion and the rear foot portion of the foot;
An insole for heat insulation, comprising: a cushion member crimped to a surface portion of the cork member.   The insole for heat insulation according to claim 1, further comprising a reinforcing sheet pressure-bonded to the back side of the cork member.   The insole for heat insulation according to claim 2, wherein the reinforcing sheet is a nonwoven fabric or a urethane sponge sheet.   The insole for heat insulation according to any one of claims 1 to 3, wherein the cushion member has a concavo-convex shape that maintains three arches on the back side of the foot on the surface side.

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