JP7152741B2 - thermal insole - Google Patents

Description

The present invention relates to an insulating insole.

At road pavement construction sites, heat-resistant safety shoes with high heat insulation performance are used as work shoes. This is because, in road paving work, especially asphalt paving work, it is necessary to work while the temperature is high before the pavement asphalt cools and hardens. temperature reaches approximately 100-120°C.

As heat-resistant safety shoes, rubber-soled shoes that are excellent in heat insulating effect (heat resistance) are already known (see, for example, Patent Document 1). In addition, special safety shoes with attached insoles are also available on the market.

In addition, as an insole characterized by a heat insulating effect, flat type cold protection (heat retention) has been mainstream so far, and it has been intended to ensure warmth in cold regions (for example, patent documents 2).

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

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

However, most of the conventional insoles, even those using cork material as the core material, are of the flat type. Therefore, there is a problem that the foot is easily fatigued due to a change in the position of the foot due to slippage in the shoe, including those for protection against the cold.

Leg fatigue significantly deteriorates workability in the field, such as when working continuously for a long time.

INDUSTRIAL APPLICABILITY The present invention can improve workability in a field where there is concern about heat transfer to the soles of the feet, reduce the burden on the feet, and easily enable continuous work for a long period of time. An object of the present invention is to provide an insole for heat insulation.

The present invention comprises an upper urethane member layer (12) on the surface of the core cork member layer (11), a skin on the surface of the upper urethane member layer (12) , and a urethane layer on the back surface of the cork member layer (11). A heat-insulating insole having a multi-layer structure formed by stacking sponge sheets and thermocompression molding,
The cork member layer (11) comprises:
The pulverized cork oak skin is molded together with an adhesive into a plate-like compressed cork having a constant thickness equal to or greater than the thickness of the region corresponding to the forefoot portion of the upper urethane member layer (12),
The midfoot corresponding region and the rearfoot corresponding region form a corner portion in which the medial edge and the lateral edge are raised,
The upper urethane member layer (12) is
A transverse arch projection (12SA), an inner longitudinal arch projection (12SB), and an outer longitudinal arch projection (12SC) are formed and crimped over the entire surface of the cork member layer (11). has been
The urethane sponge sheet is
The entire back surface of the cork member layer (11) including the back surface of the corner portion is crimped to the same thickness as the skin,
moreover,
The upper urethane member layer (12) is
The thickness of the forefoot corresponding region is equal to or less than the thickness of the cork member layer (11),
The thickness of the heel corresponding region included in the rearfoot corresponding region is made as thin as the thickness of the forefoot corresponding region,
The area corresponding to the fifth metatarsal bone of the foot is characterized in that it is made as thin as the thickness of the upper urethane member layer (12) of the area corresponding to the heel .

moreover,
The cork member layer (11) comprises:
The medial edge gradually rises from a location corresponding to the ball of the big toe, reaches a maximum height at a location facing the center of the lateral arch protrusion (12SA), and becomes substantially flat toward the heel. cage,
Further, the lateral edge gradually rises from a portion corresponding to the ball of the toe and reaches the maximum height near the tip of the region corresponding to the hindfoot portion, and is substantially flat toward the heel side. do.

Further, the cork member layer (11), the upper urethane member layer (12), the skin and the urethane sponge sheet are characterized by having a bifurcated jikatabi shape.

The thickness of the cork member layer (11), the upper urethane member layer (12), the urethane sponge sheet , and the outer skin in the region corresponding to the forefoot portion is about 5.5 mm,
A heel corner included in the corner portion has a height of about 15 mm.

As described above, according to the present invention, the peripheral edge of the area corresponding to the midfoot portion to the rearfoot portion of the cork member is partially raised by compression, and furthermore, the cork member is provided with the rim of the cork member. Since the cushion member is arranged, it is possible to improve the heat insulating effect and to suppress the change in the position of the foot due to slippage while maintaining the weight, and it is possible to use it even in a harsh work site. To provide a heat-insulating insole capable of reducing the burden on the feet and preventing fatigue of the feet even after continuous work for a long period of time.

In particular, not only to insulate the transmission of high temperature heat (high temperature heat) to the sole (sole), but also to insulate (also called insulation) the transmission of cold to the sole. significantly improves workability in harsh work sites.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing an example in which a heat insulating insole according to an embodiment of the present invention is used for pavement work shoes; FIG. 3 is a schematic perspective view for explaining the relationship between the heat-insulating insole, safety shoes for pavement construction, and the foot skeleton. FIG. 3 is a schematic side view for explaining the relationship between the heat-insulating insole, the safety shoe for paving work, and the foot skeleton; It is a schematic perspective view for explaining a foot skeleton. It is a schematic side view for explaining a foot skeleton. It is a schematic bottom view for explaining the relationship between the heat insulating insole and the foot skeleton. It is a schematic plan view which shows an example of the insole for heat insulation. FIG. 8 is a schematic longitudinal sectional view of the heat insulating insole shown in FIG. 7 ; FIG. 8 is a schematic cross-sectional view in the width direction of the heat insulating insole shown in FIG. 7 ; It is a schematic bottom view which shows an example of the insole for heat insulation. It is a schematic (inner) side view showing an example of a heat insulating insole. It is a schematic (outer) side view showing an example of a heat-insulating insole. FIG. 4 is a schematic diagram showing the result of simulation for explaining the temperature characteristics of the heat-insulating insole. FIG. 4 is a schematic diagram showing the results of a simulation for explaining the temperature characteristics of the heat-insulating insole; FIG. 4 is a schematic configuration diagram illustrating a heat-insulating insole according to another embodiment of the present invention; FIG. 10 is a schematic perspective view illustrating a heat-insulating insole according to still another embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment>
FIG. 1 shows a configuration example of an insole for pavement construction shoes to which a heat insulating insole according to the present embodiment is applied. 1(a) is a schematic perspective view of the surface (upper surface) side of the insole for pavement construction shoes, and FIG. 1(b) is a schematic cross-sectional view along line bb in FIG. 1(a). be. Insoles for paving work shoes are used in a state of being inserted into work shoes such as safety shoes for paving work, which will be described later. are almost identical (left-right symmetrical), the insole 10R for pavement construction shoes for the right foot (RF) will be exemplified and explained here.

As shown in FIGS. 1(a) and 1(b), the paving work shoe insole 10R includes a cork material layer 11 (also referred to as compressed cork material) having substantially the same shape as the plane of the sole, which is also referred to as the sole. , for example, a urethane layer 12 (also referred to as a compressed urethane material) is thermally bonded to the upper surface (surface portion) of the cork material layer 11 .

As the cork material layer 11, for example, a compressed cork material (compressed cork) obtained by compression-molding pulverized cork oak bark together with an adhesive into a thin plate is used.

Further, in the paving work shoe insole 10R, on the back surface portion 10B side, the area corresponding to the forefoot portion to the rearfoot portion of the sole, which will be described later, on the lower surface of the cork material layer 11 has an entirely flat planar shape (flat plate). shape). The pavement construction shoe insole 10R is provided with a wall-like peripheral raised portion 11W at the peripheral portion of at least the region corresponding to the midfoot and hindfoot portions of the sole (to be described later). Peripheral rising portion 11W has a maximum height of about 15 mm from the bottom surface on the side of back surface portion 10B, for example, due to cork material layer 11 and urethane layer 12 .

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

The projecting portion 12S includes a horizontal arch projecting portion 12SA substantially corresponding to the later-described horizontal arch of the three arches of the sole, and a medial longitudinal arch projecting portion 12SB substantially corresponding to the later-described medial longitudinal arch. and a lateral longitudinal arch projection 12SC which substantially corresponds to the lateral longitudinal arch. The horizontal arch projection 12SA has a predetermined shape with a maximum height of about 10 mm from the bottom surface of the insole 10R for paving construction shoes on the side of the back surface 10B.

That is, in the paving work shoe insole 10R of the present 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.

Further, in the pavement work shoe insole 10R, a non-woven fabric 13 as a reinforcing sheet is thermo-compressed over the entire lower surface (bottom surface) side of the cork material layer 11. As shown in FIG. The nonwoven fabric 13 has a heat retaining property and is provided to maintain the shape of the cork material layer 11, and particularly prevents the edge portion of the peripheral raised portion 11W from being damaged. For the nonwoven fabric 13, natural materials such as cotton, hemp, and wool, synthetic fibers, regenerated fibers, pulp, polyester, and the like are used, for example. Also, instead of the nonwoven fabric 13, a urethane sponge sheet may be employed.

On the other hand, on the entire surface of the urethane layer 12, a quick-drying surface layer member 14 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 a sock or the like and does not slip easily is used. A member having a deodorizing effect or an antibacterial effect can also be employed as the surface layer member 14 .

According to the paving work shoe insole 10R 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 provides high heat insulation as the paving work shoe insole 10R. The effect (thermal insulation) can be secured.

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

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

Moreover, since the cork material layer 11 is protected by the non-woven fabric 13, it is possible to prevent the peripheral upright portion 11W from being deformed and the cork material layer 11 from being damaged.

Further, in the insole 10R for pavement construction shoes of the present embodiment, like the main portion 11Wex shown in an enlarged manner in FIG. By adopting the structure, it is possible to effectively suppress the wraparound of heat to the soles of the feet.

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

Here, the relationship between the pavement work shoe insole 10R, the pavement work safety shoe AS, and the foot skeleton FB will be described.

FIG. 2 is a schematic perspective view showing a state in which the safety shoes AS for pavement work are worn, for right foot RF as an example, and FIG. 3 is a schematic side view thereof. 2 and 3, the insole 10R for paving work shoes and the foot skeleton FB of the right foot RF are shown in a state in which the paving work safety shoes AS are transparent. 4 and 5 both show the foot skeleton FB. FIG. 4 is a schematic perspective view showing the three arches of the sole FT using 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 10R for paving work shoes and the sole FT of the foot skeleton FB.

As shown in FIGS. 2 and 3, the insole 10R for pavement construction shoes according to the present embodiment is inserted into a safety shoe AS for pavement construction having an upper 20 made of leather, for example, and faces the surface portion 10S side. The back surface portion 10B side is attached along the inner sole 22 of the safety shoes AS for paving work. The insole 10R for paving work shoes is used in a detachable state with respect to commercially available paving work safety shoes AS. Safety shoes for pavement work AS have a flat outsole 21 that contacts the pavement surface, for example, so as not to leave unnecessary footprints on the pavement surface where asphalt or the like is paved. Formed by a rubber sole. The rubber sole has moderate heat resistance effect.

When a worker who is a construction worker puts on the paving work safety shoes AS, the sole FT of the worker touches the surface portion 10S of the paving work shoe insole 10R through a sock (not shown). abutted. As a result, the insole 10R for pavement construction shoes functions as a heat-insulating insole, and together with the heat-resistant effect of the shoe sole 21, it is possible to ensure further heat-insulating performance (details will be described later).

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

The foot skeleton FB is composed of a front foot portion 120, a middle foot portion 122, and a rear foot portion 123, as shown in FIGS. In this embodiment, the names used in the manufacturing industry of prosthetic limbs and the like are used for explanation without using anatomical names. Also, here, the portion from the ankle (toe side) is referred to as a "foot", and the right foot RF is exemplified.

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 phalanx 145 .

The metatarsal portion 122 includes a first metatarsal bone 151, a second metatarsal bone 152, a third metatarsal bone 153, a fourth metatarsal bone 154, and a fifth metatarsal bone 155, as shown in FIGS. , the first cuneiform bone 161 , the second cuneiform bone 162 , the third cuneiform bone 163 , the cuboid bone 171 and the navicular 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 phalanx 143, a fourth proximal phalanx 144, and a fifth proximal phalanx. 145, and the vicinity of the head of each 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 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 . Therefore, the vicinity of the center of the stepping portion 126 is also referred to as the rear end of the forefoot portion when viewed from the forefoot portion 120 . Also, 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, when viewed from the middle foot portion 122, the vicinity of the center of the stepping portion 126 is also referred to as the middle foot portion tip.

The hindfoot portion 123 is the area formed by the talus 175 and the calcaneus 177, as shown in FIGS.

The foot, as shown in FIG. 4, has an arch structure (three arches 188 of the sole FT) consisting of a lateral arch 181, an inner longitudinal arch 183, and an outer longitudinal arch 186 of the foot skeleton FB. is important.

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

The medial longitudinal arch 183 is a raised line connecting the first metatarsal bone 151, the first cuneiform bone 161, the scaphoid bone 173, the talus bone 175, and the calcaneus bone 177 (also referred to as medial longitudinal arch line IA).

The lateral longitudinal arch 186 is a raised line connecting the fifth metatarsal bone 155, the cuboid bone 171, and the calcaneus 177 (also called lateral longitudinal arch line OA).

As shown in FIG. 6, in the sole FT, the base of the big toe (near the head of the first metatarsal bone 151) of the treading portion corresponding region 226 corresponding to the treading portion 126 is defined as the "big toe. On the other hand, the area around the base of the little toe (near the head of the fifth metatarsal bone 155) is called the "ball of the little toe LB". In addition, the inside refers to the big toe side of the foot, and the outside refers to the little toe side of the foot.

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

In FIG. 6, the insole 10R for paving work shoes comes into contact with the sole FT of the worker when wearing the paving work safety shoes AS. As a result, during work, a region 220 corresponding to the forefoot portion 120 (a region corresponding to the forefoot portion), a region 222 corresponding to the middle foot portion 122 (a region corresponding to the middle foot portion), and a region 223 corresponding to the rearfoot portion 123 The sole FT is wholly held by the (region corresponding to the rear foot portion).

In particular, the lateral arches 181 in the three arches 188 of the sole FT are mainly aligned with the lateral arches 183 by the lateral arch protrusions 12SA of the convex portions 12S. The outer longitudinal arch 186 is held by the inner longitudinal arch protrusion 12SB of the shaped part 12S and the outer longitudinal arch protrusion 12SC of the protruding part 12S that mainly trims the outer longitudinal arch 186 respectively. As a result, the shape of the sole FT can be sufficiently supported by the insole 10R for pavement construction shoes. Therefore, even when working for a long time, it is possible to suppress the burden and fatigue on the operator's feet, and to keep the three arches 188 of the sole FT in good condition at all times.

The heel portion of the foot is held by the heel cup portion 10C of the insole 10R for pavement construction shoes. Mainly, the inner portion of the right foot RF is held by the inner peripheral edge raised portion 11WI of the peripheral edge raised portion 11W, and the outer portion of the right foot RF is mainly held by the outer peripheral edge raised portion 11WO of the peripheral edge raised portion 11W. As a result, it is possible to suppress positional changes, such as positional deviation, such as lateral or vertical slippage of the worker's feet in the safety shoes for paving work AS. Therefore, it is possible to reduce the burden and fatigue on the legs of the operator even after working for a long time.

Moreover, according to this pavement work shoe insole 10R, the sole FT of the worker during work is more effectively protected from high temperature heat than in the case of only the safety shoes AS for pavement work in which the shoe sole 21 is made of rubber. become able to. Therefore, it is possible to improve work efficiency in pavement work of roads and the like, 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. 7 to 12. FIG.

That is, FIG. 7 is a schematic plan view (upper surface) showing an example of the paving work shoe insole 10R for right foot RF, and FIG. 8 is a paving work shoe insole 10R along line rr shown in FIG. is a schematic cross-sectional view in the length direction of the . 9A and 9B are schematic cross-sectional views in the width direction of the insole 10R for pavement construction shoes, with FIG. A cross section along line tt is shown in FIG. 9(c), and a cross section along line uu in FIG. 7 is shown in FIG. 9(c).

7 to 12, If indicates the front (toe) side of the insole 10R for pavement construction shoes, Ib indicates the rear (heel) side, Ii indicates the inner side of the insole 10R for pavement construction shoes, and Io indicates that side. Is indicates the outer side, Is indicates the surface portion (10S) side of the insole 10R for pavement construction shoes, and Iu indicates the back surface portion (10B) side thereof.

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

However, in FIGS. 7 and 8, the region corresponding to the forefoot portion 120 of the right foot RF shown in FIG. A region 222 will be described, and a region corresponding to the rear foot portion 123 of the right foot RF will be described as a rear foot portion corresponding region 223 . In addition, in the middle foot portion corresponding region 222 and the rear foot portion corresponding region 223 shown in FIG. In the corresponding region 223, the raised peripheral edge portion 11W on the outer side of the right foot RF will be described as the raised outer peripheral edge portion 11WO.

In addition, "11WIS" in the figure is the inner peripheral edge rising position indicating the position where the inner peripheral edge rising portion 11WI starts rising, and "11WOS" indicates the outer peripheral edge rising position indicating the rising start position of the outer peripheral edge rising portion 11WO. This is the edge raised position. In FIG. 7, "CA" is the central longitudinal arch line, "IA" is the inner longitudinal arch line, and "OA" is the outer longitudinal arch line. "Sa" in the figure indicates, for example, the position of the top of the lateral arch projection 12SA on the lateral arch line (not shown), and "Sb" in the figure indicates the surface of the insole 10R for pavement work shoes. A particularly low-hardness region in the portion 10S is shown, respectively.

As shown in FIGS. 7 to 12, the insole 10R for pavement construction shoes according to the present embodiment is particularly suitable when used, for example, as an insole for road pavement construction safety shoes AS.

That is, as shown in FIGS. 7 to 9, the insole 10R for pavement construction shoes of the present embodiment uses the cork material layer 11 as a core material, and the peripheral edges of the region 222 corresponding to the middle foot portion and the region 223 corresponding to the rear foot portion are formed. 11W of raised peripheral edge portions are provided. Moreover, the insole 10R for pavement construction shoes has a cushioning urethane layer 12 on the surface portion 10S side, and has a convex portion 12S capable of reducing the burden on the foot and eliminating excessive fatigue.

The lateral arch protrusion 12SA of the protruding portion 12S is for adjusting the lateral arch 181 of the sole FT shown in FIG. The top portion Sa has a predetermined shape with a height of about 10 mm, which fits the rear portion of the corresponding region 226 .

The inner longitudinal arch convex portion 12SB of the convex portion 12S is for adjusting the inner longitudinal arch 183 of the sole FT shown in FIG. It's shaped to fit.

The lateral longitudinal arch protrusion 12SC of the protruding portion 12S is for adjusting the lateral longitudinal arch 186 of the sole FT shown in FIG. , has a predetermined shape.

As shown in FIGS. 8 and 9, the lateral arch protrusions 12SA, the inner longitudinal arch protrusions 12SB, and the outer longitudinal arch protrusions 12SC of the protrusions 12S are smoothly curved surfaces (recesses). are connected by

In the paving work shoe insole 10R of the present embodiment, the hardness of at least the area (Sb) between the lateral arch protrusion 12SA and the inner longitudinal arch protrusion 12SB, which is a smooth curved surface, is equal to that of the lateral arch. It is lower than the hardness of the projection 12SA for the inner longitudinal arch and the projection 12SB for the inner longitudinal arch, for example, about 21 to 24 degrees as measured by a C hardness meter.

That is, on the surface portion 10S of the insole 10R for pavement construction shoes, a region Sb having a lower hardness than other regions is arranged between the lateral arch protrusion 12SA and the inner longitudinal arch protrusion 12SB. In this manner, by arranging the low-hardness region Sb in a portion substantially corresponding to the inner longitudinal arch line IA, the cushioning effect during impact absorption can be improved.

The raised peripheral edge portion 11W is composed of an inner raised edge portion 11WI that mainly holds the inner side of the right foot RF and an outer raised edge portion 11WO that mainly holds the outer side of the right foot RF. and Both the inner peripheral edge raised portion 11WI and the outer peripheral edge raised portion 11WO have a predetermined shape with a maximum position (total height) of about 15 mm.

In the cork material layer 11, as shown in FIG. 8, the surface of the forefoot corresponding region 220 and the entire back surface of the forefoot corresponding region 220, middle foot corresponding region 222, and rearfoot corresponding region 223 are flat. A non-woven fabric 13 is pressure-bonded to the entire rear surface thereof. As a result, the heat retaining property is enhanced, and the cork layer 11 is damaged, and the raised peripheral edge portion 11W is protected (reinforced) from being crumbled or deformed during use.

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

For example, as shown in FIG. 11, the medial peripheral edge upright portion 11WI gradually rises from the vicinity of the medial peripheral edge upright position 11WIS in the vicinity of the ball of the big toe MB as a starting point, and in the rearfoot corresponding region 223, the lateral peripheral edge upright portion 11WO and the lateral peripheral edge upright portion 11WO. They are formed to have approximately the same height.

For example, as shown in FIG. 12, the outer peripheral edge upright portion 11WO gradually rises from the vicinity of the outer peripheral edge upright position 11WOS in the vicinity of the ball of the toe LB as a starting point, and in the rearfoot corresponding region 223, the inner peripheral edge upright portion 11WI and the inner peripheral edge upright portion 11WI. They are formed to have approximately the same height.

As shown in FIGS. 11 and 12, the inner peripheral edge raised portion 11WI and the outer peripheral edge raised portion 11WO rise gradually, and not only when they have an overall gentle shape, but also near or outside the inner peripheral edge raised position 11WIS. It may be shaped so as to steeply rise from the vicinity of the edge rising position 11WOS (for example, see FIG. 3).

FIG. 13 shows the results of a simulation performed to explain the temperature characteristics of the insole 10R for pavement construction shoes according to the present embodiment with respect to high-temperature heat, in comparison with a comparative example. FIG. 13(b) is a graph showing the change in surface temperature according to the heating time.

In this simulation, special safety shoes (not shown) with attached insoles are used. A comparison was made with a case where a prototype of the insole 10R for paving work shoes according to the embodiment was attached. As a prototype, for example, a nonwoven fabric for reinforcement, a 3mm thick heat insulating cork sheet (CORK3mm), a cushioning material (VF150), and Saracky (trade name, CS0902C#101) are layered in order from the bottom and crimped. Using.

In the simulation, the safety shoes were placed on a metal plate with a surface temperature of 150°C so that the soles were in contact with each other. The surface temperature in the vicinity was measured at 5 minute intervals until 20 minutes had passed since the start of heating. In addition, as a reference example, the measurement was also performed without wearing an insole (indicated by x in FIG. 13). The unit of surface temperature is °C.

As a result of the simulation, as shown in FIGS. 13(a) and 13(b), the prototype of the insole 10R for pavement construction shoes according to the present embodiment ( (indicated by ●) showed a higher heat insulation effect by 6°C to 7°C on average.

In addition, prototypes different from the prototypes used in the above simulation (for example, nonwoven fabric for reinforcement, 3 mm thick heat insulating cork sheet (CORK3 mm), cushioning material (VF100), Saracky (trade name, CS0902C#101)) is attached to safety shoes (for example, ISA-805 manufactured by Midori Anzen Co., Ltd.) with the attached insole (fawn fabric + EVA cup insole) removed, and the fit, grip, cushioning, and fatigue resistance We conducted an experiment on As a result, compared to the attached insole, the fit, grip, and cushioning of the prototype were generally superior, and it was highly evaluated that it was less tiring even after long hours of use.

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

As described above, according to the insole for pavement construction shoes of the present embodiment, the core material is a compressed cork material and has a laminated structure with a compressed urethane material. Further improvements can be made.

That is, a cork material layer is used as a core material of a detachable insole for pavement work shoes used in a state of being attached to safety shoes, and the peripheral edge of the region corresponding to the middle foot part and rear foot part of the cork material layer is provided 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, it is possible to ensure sufficient cushioning properties for the soles of the feet, and to sufficiently suppress the transfer of heat from the pavement surface such as asphalt to the soles of the workers' feet. Therefore, it is possible to effectively protect the soles of workers during work from the high temperature heat of the asphalt, which reaches a temperature of about 100 to 120° C. after about 20 minutes have passed since pavement.

In addition, since the midfoot portion and the rearfoot portion of the foot can be firmly fixed by the peripheral raised portion, it is possible to suppress displacement and slippage 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 of the sole with appropriate cushioning properties, thereby reducing the burden and fatigue on the foot.

As a result, it is possible to improve work efficiency in pavement construction of roads and the like, such as enabling continuous work over a longer period of time, and to dramatically improve workability on site.

In addition, since the cork material layer can be reinforced by forming the non-woven fabric on the lower surface of the cork material layer, the shape of the peripheral raised part can be easily maintained, especially the edge part of the peripheral raised part during use. It is possible to easily protect the cork material layer from defects such as chipping and crumbling or cracking.

In addition, when a quick-drying surface layer member is provided, it is possible to always ensure a comfortable fit and an appropriate grip as well as a smooth wearing feeling.

In the above-described embodiment, the insole for pavement work shoes has been exemplified and explained. can also be applied.

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

In addition, the heat-insulating insole of this embodiment is suitable for use in harsh sites where high-temperature heat transfer from the feet is a problem, such as workshops and factories where it is dangerous if molten glass or castings are scattered on the floor surface. be.

In addition, the heat insulating insole of the present embodiment is not limited to cases where high temperature heat transfer from the feet is a problem, but cold transfer from the feet such as on snow or ice is a problem. Snow removal work such as snow removal work, winter mountain climbing, smelt fishing in frozen lakes and ice competitions, or work shoes for cutting ice and working in a freezer.

FIG. 14 shows the results of a simulation performed to explain the temperature characteristics of the heat-insulating insole according to the present embodiment with respect to coldness. FIG. FIG. 14(b) is a graph showing changes in the surface temperature according to the cooling time.

14(a) and 14(b) show the case where the insole prototype used in the simulation shown in FIG. ) and the case of boots with no insole (indicated by x in the figure) are shown in comparison. The unit of surface temperature is °C.

FIGS. 14(a) and 14(b) show, for example, on a cooling body (surface temperature of about −13.1° C.) not shown, boots are placed in contact with the soles, and the surface is Using a thermometer (for example, ID-1100E manufactured by Anritsu Keiki Co., Ltd.), the surface temperature of the insole in the vicinity of the stepping portion corresponding area was measured at intervals of 5 minutes until 60 minutes after the start of cooling.

It was found that the shoes with insoles had a higher cooling (heat-retaining) effect against the transmission of cold than the boots only (without insoles).

Further, as the insole 10R for pavement construction shoes according to another embodiment, at least the portion of the peripheral raised portion 11W that comes into strong contact with the foot is covered with a urethane layer 12, such as a main portion 11Wex shown in an enlarged manner in FIG. It is also possible to have a single layer structure of only

Furthermore, as an insole 10R for pavement construction shoes according to another embodiment, for example, as shown in FIG. It is also possible to

10R Pavement work shoe insole 11 Cork material layer 11W Peripheral upright portion 11WI Inner peripheral upright portion 11WIS Inner peripheral upright position 11WO Outer peripheral upright portion 11WOS Outer peripheral upright position 12 Urethane layer 12S Convex portion 13 Nonwoven fabric 14 Surface layer member 120 Forefoot Part 122 Middle foot part 123 Rear foot part 188 3 arches of sole 220 Forefoot part corresponding area 222 Middle foot part corresponding area 223 Rear foot part corresponding area 226 Traction part corresponding area AS Safety shoes for pavement work FB Foot skeleton FT Sole

Claims (4)

An upper urethane member layer (12) is placed on the surface of the core cork member layer (11), a skin is placed on the surface of the upper urethane member layer (12) , and a urethane sponge sheet is placed on the back surface of the cork member layer (11). A heat-insulating insole with a multi-layer structure molded by thermocompression,
The cork member layer (11) comprises:
The pulverized cork oak skin is molded together with an adhesive into a plate-like compressed cork having a constant thickness equal to or greater than the thickness of the region corresponding to the forefoot portion of the upper urethane member layer (12),
The midfoot corresponding region and the rearfoot corresponding region form a corner portion in which the medial edge and the lateral edge are raised,
The upper urethane member layer (12) is
A transverse arch projection (12SA), an inner longitudinal arch projection (12SB), and an outer longitudinal arch projection (12SC) are formed and crimped over the entire surface of the cork member layer (11). has been
The urethane sponge sheet is
The entire back surface of the cork member layer (11) including the back surface of the corner portion is crimped to the same thickness as the skin,
moreover,
The upper urethane member layer (12) is
The thickness of the forefoot corresponding region is equal to or less than the thickness of the cork member layer (11),
The thickness of the heel corresponding region included in the rearfoot corresponding region is made as thin as the thickness of the forefoot corresponding region,
A heat-insulating insole, wherein a region corresponding to the fifth metatarsal bone of the foot is made as thin as the thickness of the upper urethane member layer (12) of the region corresponding to the heel . moreover,
The cork member layer (11) comprises:
The medial edge gradually rises from a location corresponding to the ball of the big toe, reaches a maximum height at a location facing the center of the lateral arch protrusion (12SA), and becomes substantially flat toward the heel. cage,
Further, the lateral edge gradually rises from a portion corresponding to the ball of the toe and reaches the maximum height near the tip of the region corresponding to the hindfoot portion, and is substantially flat toward the heel side. The heat insulating insole according to claim 1. 3. The heat insulating insole according to claim 1, wherein the cork member layer (11), the upper urethane member layer (12), the skin and the urethane sponge sheet have a bifurcated jikatabi shape. The thickness of the cork member layer (11), the upper urethane member layer (12), the urethane sponge sheet , and the outer skin in the region corresponding to the forefoot portion is about 5.5 mm,
4. The heat-insulating insole according to claim 1, wherein the height of the heel corner included in the corner portion is about 15 mm.

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