DE202022002319U1 - Undersole for shoe bottom - Google Patents

Abstract

Undersole for feet as an active arrangement in the layer structure of a shoe bottom, which as a replaceable, dimensionally stable undersole (1) comprises an undersole underside and an undersole upper side, the contact surface of the undersole underside lying above the insole and the contact surface of the undersole upper side pointing in the direction of the sole, characterized in that the plane-parallel spaced contact surfaces of the flat undersole (1) in the forefoot and ball of the foot area have at least two laterally adjacent sub-areas I, II (3, 4), which run transversely to the longitudinal direction (14) of the undersole (1) and have a sub-area III (5 ) which forms the heel area 6, which is located in front of the sub-areas I, II (3, 4), seen in the longitudinal direction (14) of the base body (2), with the sub-areas I, II (3, 4) by different bending stiffness in the longitudinal (14) and transverse direction (15) of the undersole (1) below decide.

Description

technical field

The present invention relates to an undersole for feet as an active arrangement in the layer structure of a shoe bottom, which as a replaceable, dimensionally stable undersole comprises an undersole underside and an undersole upper side, the contact surface of the undersole underside being arranged above the insole and the contact surface of the undersole upper side pointing in the direction of the sole of the foot.

State of the art

In order to be able to describe the subject of the invention as a special and/or additional medical shoe insert in the form of an undersole, it is necessary to start from the known terminology for shoes.

Based on the state of the art, a shoe is footwear with a fixed base, also known as the bottom of the shoe, which is always connected to the upper part, also known as the shaft DE 20 2017 101 304 U1 evident. The toe, ball and heel area consists of a normal material. However, such a shoe is not suitable for supporting the walking process with a hallux, which represents a malposition of the big toe.

The same applies to sneakers with a synthetic fiber shaft and pointed rubber outsole, to glued high-heeled shoes with sequins, to ski boots, such as those from the DE 10 2009 005 190 A1 known for welted western boots or for vulcanized colorful children's shoes. Although all models are visually different, they all have the same structure in principle. However, these shoes are not suitable for supporting the walking process with a hallux, the misalignment of the big toe.

So when a shoe is mentioned in the following description, the characteristic basic model of a shoe is meant. A normal made-to-measure or ready-to-wear shoe consists of two main parts, the upper part being called the upper and the lower part being called the bottom. The shaft is mainly made up of several layers and individual parts that are glued and/or sewn together. These layers, e.g. inner upper (lining), intermediate upper (intermediate lining) and outer upper (upper leather) and the trimmings of the outer upper are not considered in detail here. Such a shoe, composed of the parts shoe base and shaft, is designed for normal feet that do not show any malposition and is therefore not suitable for supporting the walking process with a hallux valgus, the misalignment of the big toe.

Depending on the model, the floor consists of at least one sole, also referred to as a shoe sole, which has a non-slip tread, as in the DE 10 2012 214 886 A1 described, has and is also called outsole. Furthermore, a typical shoe also has an insole, which is also referred to as an insole, such as from the DE 10 2014 015 920 A1 known, with an attached outsole. The insole from the DE 10 2014 015 920 A1 has a special feature in the form of a recess, which provides padding for the midfoot area and is intended to positively support the walking process. But this form of support of the walking process is also not suitable if a hallux is present.

Depending on the type of shoe, one or more midsoles can be present between the insole and the outsole, for example in sports shoes. Such a sports shoe is for example the DE 20 2011 103 699 U1 refer to. The outsole is designed to be as abrasion-resistant and non-slip as possible and the midsole contributes to the wearing comfort, while the inner sole is designed to be relatively soft. The advantage is in the outsole, which in the forefoot area has two laterally adjacent sub-areas, the sub-areas being characterized by different bending stiffnesses in the longitudinal direction of the shoe bottom. This forces the wearer of such a shoe to have a certain rolling behavior when walking. The disadvantage of this embodiment of a shoe structure is that the different flexural rigidity of the outsole made of the same material is achieved over the profile. The bending stiffness is low on the inside of the forefoot area and higher on the outside of the forefoot area. The disadvantage of this shoe bottom structure is that the valgus position in the big toe joint is even more pronounced and is therefore not suitable for supporting the walking process with hallux valgus.

In some shoe models, the insole is covered with an additional cover sole and an insole is placed over it. The insole is a separate insole that is placed inside the shoe for comfort or orthopedic reasons. The most common form of insoles are shoe inserts for comfort, which are industrially mass-produced for different shoe sizes. This type of loose insoles can already be present in the shoe, as in the case of the "sports shoe" type of shoe, as in the case of the aforementioned DE 20 2011 103 699 U1 famous. When absent an insole can the shoe, as in the DE 10 2020 106 260 A1 disclosed, supplemented or retrofitted with an insole. This insole is designed in such a way that it has a hollow curvature. Due to the concavity, the insole acts like a single spring, which is intended to cushion and relieve the load on the foot during use. Basically, it is about supporting the arch of the foot. However, this type of insole is not suitable for supporting the walking process in the case of a hallux.

Insoles that have the desired properties are also available in different materials, depending on the needs of the customer and taking into account the seasons. Insoles used in summer are usually made of cork or rubber with a thin textile layer. Leather and terry cloth are also used. They are usually punched and, depending on the material, sewn at the edges to prevent fraying. Traditionally, insoles have been used in winter for better thermal insulation. Classic, warming insert materials such as lambskin and felt are used for thermal insulation, with newer materials made of faux fur or other synthetic materials. In the meantime, there are also heated soles on the market. Insoles can also be equipped with additional antibacterial agents, so that the decomposition of sweat by bacteria, which causes the smell of foot sweat, is prevented. None of the aforementioned insoles meet the requirements for positively influencing the walking process in the case of a hallux.

There are also orthopedic insoles. Orthopedic insoles are usually. no bulk items. Such insoles are manufactured individually by an orthopedic shoemaker according to the medical indication by an orthopedic specialist and are individually adapted to the individual foot of the patient.

Such orthopedic insoles, known from the prior art, are used to correct foot malpositions, for example by supporting the arch of the foot. For this purpose, an insole base body is provided with a profile structure made of foam, which is made according to the footprint of the person for whom the insole is made. Because an impression of the foot is required, the known insole is very expensive and is only intended for use by a single person.

The changeover from individual production to mass production for orthopedic insoles is the aforementioned DE 10 2020 106 260 A1 to be taken, although these insoles are not suitable for use as walking aids for hallux valgus.

Three-dimensionally shaped insoles that are commercially available are also known from the prior art. As a rule, these products have similar features, such as a bulky pad to support the transverse arch, arch support for the medial edge of the sole of the foot and a recess for the heel ball, often with additional pressure-absorbing pads or inlays under the heel bone. However, there is no proof of the positive health effects of these uniform mass products on the individual feet of the wearer and this has not yet been done. Even these three-dimensional insoles do not meet the requirements for positively influencing the walking process in the case of an existing hallux valgus.

For the sake of completeness, it should also be pointed out that the mechanical or manual production of the shoe bottom is not the subject of the present consideration.

task

The present application is therefore based on the object of avoiding the existing disadvantages of the aforementioned prior art, improving it compared to this and expanding the comfort range of mass-produced shoes by using the shoe bottom with an additional layer structure, thereby supporting the walking process improved in the case of disturbed biomechanics of the foot. Furthermore, the high production costs of orthopedic insoles produced individually to support hallux valgus, hallux rigidus and hallux varus are to be greatly reduced.

solution

The solution to the problem is to create an undersole of the type mentioned at the outset that can be produced particularly easily and inexpensively in industrial production and that can be subsequently integrated into the bottom of the shoe. The invention is also based on the object of constructing an undersole in such a way that the undersole enables relief of the joints of an insole wearer in the toe and ball area, advantageously in the inner foot area, and can be worn by people with different foot shapes.

According to the invention, these objects are achieved by means of an undersole with the features of claim 1 . Advantageous configurations arise from the associated subclaims.

description

The inventive undersole is an additional sole that can be integrated into the bottom of the shoe and is used for the non-surgical treatment of bones and joints. This undersole could also be referred to as a midsole, midsole or orthopedic insole. However, with regard to the terminology, the term "undersole" is used throughout the description. The designation of the midsole is therefore out of the question because the midsole is located between the insole (inner sole) and the outsole, while the undersole is arranged above the insole (inner sole). Furthermore, the midsole consists mainly of a PU cushioning layer.

That is, the aim of the invention is to increase the quality and properties of existing footwear. The extension is made possible by the additional inventive undersole in the shoe bottom construction. The additional undersole gives the footwear orthopedic properties. The additional orthopedic property consists in the stabilization of the shoe bottom structure, the inventive undersole being designed in such a way that the big toe joint is positively influenced. By using the inventive undersole in the bottom of the shoe, especially in fashionable shoes, the utility property is increased and the quality of the shoe design as a whole is improved.

This undersole, which can be integrated in the layer structure of a shoe bottom, thus forms an effective arrangement in that the inventive undersole has a positive influence on the feet and thus on hallux valgus, hallux rigidus and hallux varus. In order to develop the subject matter of the invention, it was necessary to identify the damage and deformation of the feet, which are known as hallux, and to examine the causes more closely. For around 10 million people affected in Germany alone, hallux means pain in the area of the metatarsophalangeal joint. Medicine distinguishes between three different types of hallux disorders. The hallux valgus as a misalignment of the big toe in the direction of the other toes. Hallux rigidus is a stiffening of the big toe due to arthrosis and inflammation in the metatarsophalangeal joint and hallux varus is a misalignment of the big toe in the direction of the other foot or in the opposite direction of the toes. The three different types of hallux are explained in more detail below in order to better understand the inventive solution of the tasks.

The first type concerns hallux valgus. Hallux valgus is the medical term for the pathological crooked position of the big toe, which moves further and further in the direction of the small toes and ensures that the ball of the foot on the inner edge of the foot increasingly bulges out. The technical term hallux valgus thus describes the outward misalignment of the big toe in the metatarsophalangeal joint. The tendons to the toes no longer run centrally across the joint, but run further inward, pulling the toes into an oblique position. Painful inflammation often develops on the ball of the big toe that protrudes as a result, caused by the pressure of the shoe upper. The medical causes of a hallux valgus that cause a deformity are well known. A malposition can worsen over time and cause painful arthrosis in the large joint in the long term, which can ultimately lead to chronic pain when stepping and/or rolling the foot and thus restricting the mobility of the foot. It is therefore advisable to react to the first signs in good time and to protect and relieve the big toe joint at an early stage with an innovative undersole.

The second type of damage is called hallux rigidus. Hallux rigidus is the wear and tear of the metatarsophalangeal joint of the big toe. Arthrosis in the metatarsophalangeal joint of the big toe occurs as a result of increasing wear and tear. The destruction of the articular cartilage leads to swelling, redness, inflammation and, in the long term, painful joint stiffness. The rolling movement of the foot is made more difficult and there is often a painful loss of movement. Stinging pain when walking impedes the normal rolling movement of the foot. The consequences are incorrect loads that can cause damage to the hip and/or knee joints. The hallux rigidus disease is therefore a consequence of cartilage wear, which increasingly occurs in older people. The causes of cartilage wear can be of various kinds. In order to slow down the progression of arthrosis in the big toe joint and to maintain pain-free mobility for as long as possible, the foot must be relieved when rolling, which is made possible by the innovative undersole.

The third type is called hallux varus. Hallux varus also causes the big toe to be misaligned. Here the big toe does not shift in the direction of the little toes, but it shifts away from them in the direction of the other foot, resulting in splayed toes. This deformation of the big toe joint is much less common. Splay toes can result from an injury or after an operation on the hallux valgus, or they can be hereditary. Here, too, prevention by using the inventive undersole can significantly slow down the progression of splayed toes and avoid or reduce pressure pain. However, if the malposition is pronounced, it can lead to pressure pain and/or movement-related pain in the big toe. The misalignments and the resulting impairments can then only be corrected surgically.

If the technical term hallux is used in the following description, all three medical types of hallux are always meant.

The advantageous property of the inventive undersole makes it possible to influence the rolling movement of the foot and to counteract a crooked position of the toes. However, in order to determine the required properties of the sole, it is necessary to identify the causes of the misalignment of the toes.

The shoes, which are mainly sold in retail and worn by people, have a basic insole shape that does not correspond to the outline of the natural sole of the foot (i.e. not the Meyer line according to Prof. Hermann von Meyer). Meyer's line is a straight line connecting the center of the heel and the ball of the big toe, measured at the footprint. This line defines the boundary of the inner last edge and thus part of the course of the outline of the insole. If the bottom of the shoe does not correspond to Meyer's line, the toes are pushed out of their original position, which in the long run leads to permanent deformation and damage to the toes. In the advanced stage, the damage first becomes noticeable through the misalignment of the big toe (hallux). This misalignment progresses, gradually affects the other marginal toes and can lead to a longitudinal axis of the big toe that points outwards almost at right angles and crosses the neighboring toes.

The cause of such a misalignment of the big toe can be caused by a shoe heel that is too high. A higher heel (more than three to four centimeters) causes increased pressure in the forefoot area. On the one hand, this promotes splayfoot formation and, on the other hand, the toes are pressed into the toe of the shoe. The sinking of the front transverse arch in the case of splayfoot causes the ball area to widen and the toes to be crooked.

Shoe tips that are too tight also often contribute to this because they do not give the toes the necessary freedom (especially to the side, but also upwards). This forces them into a misalignment that, over time, leads to a permanent misalignment in the ankles. This primarily affects women who wear triangularly shaped women's shoes, where the toes try to fit into the precisely tapered toe caps, which encourages the toes to develop incorrectly.

If the shoes are too short, the toes are also pushed out of their natural position, which not only promotes hallux but also leads to hammer and claw toes.

If one knows the causes that lead to a hallux, the prevention strategy would be clear, e.g. avoiding wearing high-heeled shoes, too narrow toes and too short toe caps. The feet comprise a quarter of all bones in the human body and are therefore extremely adaptable. If a variety of shoes were worn, there would usually be no damage. Only the regular or predominant wearing of shoes that do not fit properly leads to the problems mentioned. The switch to flat shoes with enough room for the toes, especially wearing thong sandals, is considered by only a few people. In the populations that wear fashionable western-style footwear, on the other hand, it is common for the toes to lie close together. Thus, the natural and beam-straight position has changed into a position that is only toe-straight with the aforementioned foot damage. The natural and healthy normal foot, on the other hand, has the toes spread apart. This means that wearing the wrong shoes can clearly be the main cause of a misalignment of the toes, especially of the hallux, unless the misalignment is genetic.

In order to counteract such a misalignment of the big toe, caused e.g. by the shape of the insole outline in fashionable shoes, and to prevent it from progressing, the use of the inventive undersole is recommended.

The invention therefore relates to a dimensionally stable undersole that can advantageously be inserted into almost all shoes as an additional undersole. Advantageously, the undersole has an undersole underside whose contact surface comes to rest directly on the upper side of the insole or insole or on a cover sole or other sole arranged above the insole. The contact surface of The upper side of the undersole points in the direction of the sole of the foot, whereby the sole of the foot can rest directly on the upper side of the undersole. In another variant, there is an insole on the upper side of the undersole, as is known from the prior art. The sole of the foot then has no direct contact with the sole of the foot.

Advantageously, the contact surfaces of the flat undersole are spaced apart in a plane-parallel manner. The insole therefore has no bumps on the front and back. Due to the plane parallelism and the small thickness of the undersole, the undersole nestles relatively close to the bottom of the shoe. The bottom of the shoe includes all layers underneath the foot. The bottom of the shoe can either only comprise an insole or have an insole with at least one insole, with the inventive undersole being arranged between the insole and the insole. The thickness of the undersole is advantageously in a range from 1mm to 3mm. Also advantageous is the possibility of a particularly good adaptability of the undersole to different shoe shapes, in particular to the normal foot shape or shoe size and the external shape of the other insoles. Advantageously, the outer shape of the insole can be adapted to the different foot shapes or to any other shape with small aids.

In order to prevent and avoid the progression of joint malalignment and hallux or other toe malalignment, as described above, it is necessary to achieve stabilization of the bottom of the shoe, which includes preventing the subsidence of the transverse arch. This is advantageously brought about by the inventive undersole. The undersole is designed in such a way that the existing footbed of the shoe floor is not changed, but is stabilized. In the forefoot and ball of the foot area, such an undersole has at least two lateral, i.e. adjacent, sub-areas I, II, which extend transversely to the longitudinal direction of the undersole, and a sub-area III, which forms the heel area and is in front of the sub-areas I, II, in the longitudinal direction seen of the base body, is located, with the sub-regions I, II differ by different bending stiffness in the longitudinal and transverse directions of the undersole.

The design of the undersole according to the invention gives the user of a shoe bottom designed with such an undersole a certain rolling behavior in the big toe area (partial area II) by suppressing or weakening the rolling behavior of the big toe joint. The gait pattern is not negatively affected because the other toes (in section I) can still roll off.

It has also turned out to be advantageous that if the surfaces of the three sub-areas I, II, III in the base body of the insole have different sizes to one another, the positive effect on the reduced roll-off behavior at the big toe joint is greatest, which, among other things, also achieves the different bending stiffnesses .

In order to avoid damage to the undersole from different forces acting on it, it is necessary for the inner contact edges of the touching partial areas I, II, III to be firmly connected to one another during the manufacturing process. The inner contact edges of sections I, II, III must not produce any fracture lines when subjected to bending loads in the longitudinal and transverse directions. In order to avoid breaking lines along the fit of the partial areas I, II, III, these inner edges advantageously have an overlapping area. The overlap area consists of a relatively large sloping area located along the edge of the fit, e.g., portion II. The fit of partial area I and the fit of partial area III, which partially enclose the fit of partial area II, also have a relatively large inclined surface. These sloping surfaces of partial areas I, III correspond to the sloping surface of partial area II, resulting in a greater overlap at the edges. A normal edge runs perpendicularly between the two plane-parallel spaced contact surfaces of the undersole, the area of the edge being determined by the distance between the contact surfaces and is therefore relatively small. By replacing the vertical surface on the peripheral edges with an inclined surface, the size of the overlapping surfaces increases significantly, which means that the strength between sections I, II, III increases enormously. The edge surrounding the fit of the undersole on the outside remains vertical in the embodiment.

In a preferred embodiment of the undersole according to the invention, the two partial areas I, II are arranged in a forefoot area of the undersole. Provision is particularly preferably made for the outer area of the foot to have a lower flexural rigidity than the inner area of the foot. A shoe sole equipped with such an undersole reduces the natural rolling movement over the big toe. A reduced rolling movement reduces the progression of a hallux and reduces the inflammation in the joint and thus the pain.

Sub-area III is followed by the two sub-areas I and sub-area II, which extend in the longitudinal direction of the base body and together form the undersole. Advantageously, partial area I and partial area III are designed in one piece and connected to each other via a bridge, whereby the two partial areas I, III form the larger area of the base body of the insole than partial area II and extend from the heel area via the metatarsal area along the bridge the outer area of the foot, extending to the tip of the foot.

In other words, partial area II forms the smaller part of the base body of the insole in terms of area, which extends from the ball area over the forefoot area to the big toe area along the inner area of the foot. It has turned out to be advantageous that if the partial area II has a lower flexural rigidity compared to the partial areas I, III, which have a higher flexural rigidity, the rolling movement of the big toe joint can be reduced. In order to achieve the positive effect of the reduced rolling movement, it is necessary to equip sub-area I and sub-areas II, III with different degrees of hardness in the material. This means that the material of sub-area I and sub-area III has the same degree of hardness and, due to the lower degree of hardness compared to sub-area II, forms the softer component of the base body. The material of partial area II has a greater degree of hardness and thus forms the harder component of the base body. Furthermore, it has been found that the base body, characterized by the relatively soft, flexible partial areas I, III designed with a low degree of hardness, can cling to structured insoles, cover soles or insoles in the bottom of the shoe. This advantageously results in a particularly good adaptability of the undersole to different foot shapes. Pressure pain on the various metatarsophalangeal joints of the hallux is avoided and the result is greater comfort.

A plastic is preferably used as the material, in particular a thermoplastic polyurethane, which stands for the highest degree of reliability, constant product quality and economy. The thermoplastic polyurethane meets the different demands that are required by the inventive undersole. The material should be relatively flexible in sections I, III of the undersole and relatively hard in section II of the undersole in order to be able to meet the different properties required for the bending stiffness of the undersole. Advantageously, the material of subarea II can be glass fiber reinforced. The material also meets the requirements for manufacturing costs because the material can be used industrially and meets the highest requirements. A TPU is used as the material, for example, although the use of other plastics is also conceivable. In another embodiment of the insole, the base body can be formed from two different plastics, which also have different flexural strengths and different degrees of hardness, in order to meet the required properties of the inventive insole. In other words, the partial area II consists of a harder plastic and the two partial areas I, III which are connected to one another in one piece are made of a softer plastic.

An advanced hallux cannot be eliminated in this way. However, the use of such an undersole, which has orthopedic properties, in the bottom of the shoe means that there is no further damage and deformation of the big toe joint, because the pressure pain on the protruding metatarsophalangeal joint is greatly reduced by reduced rolling behavior.

character list

• 1 in einer schematischen Draufsicht eine Unterlegsohle für einen Schuhboden, und
• 2 in einer Schnittansicht den Schichtaufbau in einem Schuhboden mit der erfindungsgemäßen Unterlegsohle.

An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows

• 1 in a schematic top view, an undersole for a shoe bottom, and
• 2 in a sectional view, the layer structure in a shoe bottom with the undersole according to the invention.

Description of a specific embodiment.

That in the 1 The exemplary embodiment shown in a schematic representation relates to an undersole 1 that is made of plastic. The undersole 1 has a base body 2 which is basically composed of two elements. A softer element and a harder element. These two elements characterize two different areas which, according to the invention, are characterized by different bending stiffnesses in the longitudinal direction 15, which essentially corresponds to the rolling direction. According to the invention, a forefoot area 11 of the undersole 1 is divided into two laterally adjacent sub-areas I, II 3, 4, with the dividing line 30 in the forefoot area 11 between these two sub-areas I, II 3, 4 being essentially curved relative to the longitudinal axis 15 of the Undersole 1 runs. The partial area II, 4 lying on the inside of the foot 13 of the undersole 1 has a relatively high flexural rigidity compared to the the foot outside 9 lying sub-area I, 3. These different bending stiffnesses of the two sub-areas I, II, 3, 4 are achieved in this embodiment exclusively by different degrees of hardness in the material.

The two elements, the softer and the harder element, are joined together in a tool mold during injection molding and divided into three different functional sub-areas I, II, III 3, 4, 5 after joining. Two of the partial areas I 3 , II 4 form the forefoot area 11 , the forefoot area 11 including the toe area 14 and the ball area 10 . The two sub-areas I 3, II 4 are located next to each other, viewed in the longitudinal direction 15 of the base body 2, with the sub-area II 4 tapering on the one hand from the ball area 10 in the longitudinal direction 15 to the toe 8 and on the other hand along the inner foot area 13. That is, the sub-area II 4 corresponds approximately to the big toe area 12 including the adjoining large part of the ball area 10 viewed in the transverse direction 16. The surface 18 of the sub-area II 4 extends almost over the entire ball area 10 and only leaves a narrow web 17 to the outer area 9 of the foot. The partial area II 4 in the forefoot area 11 is surrounded on the one hand by the inner foot area 13 and on the other hand by the partial area I 3 and the web 17 . Sub-area I 3 corresponds approximately to toe area 14 including bridge 17 without big toe area 12. Area 19 of sub-area I 3 extends almost over the entire toe area 14 and bridge area 17, with sub-area I 3 on the one hand separated from sub-area II 4 and on the other is enclosed by the outer foot area 9 .

In the preferred embodiment, the toe area 14 of the undersole 1 can be adjoined by a ball area 10 . The ball of the foot area 10 has a surface 18 of the partial area II 4 which extends transversely to the longitudinal direction 15 of the base body 2 and extends from the inner area 13 of the foot almost to the outer area 9 of the foot. Only a narrow web 17 separates the surface 18 of the ball area 10 from partial area I 3 and partial area III 5. The ball area 10 lying in partial area II 4 has a high bending stiffness at least in the longitudinal 15 and transverse direction 16 of the undersole 1. The surface 18 of the ball area 10 extends seamlessly to the tip of the toe 8. The surface 18, which tapers towards the tip of the foot 8, only includes the big toe area 12, which has the same high bending stiffness as the ball area 10. The area of the ball area 10 and the area of the Big toe area 12 form the common surface 18 of partial area II 4. The flexural rigidity in the adjacent toe area 14 of partial area I 3 is preferably lower than that of partial area II 4, which is designed with higher flexural rigidity 2, a comfortable rolling behavior of the other toes can be supported. Also preferably, the ball area 10 can be adjoined by a metatarsal 7 and heel area 6 , the flexural rigidity of which is lower in the longitudinal direction 15 of the base body 2 . Particularly preferably, the flexural rigidity can be as low as that of partial area I 3 in toe area 14 . Such a soft heel area 6 can positively support the rolling motion when shoe 31 is put on. Due to the relatively soft design of the metatarsal 7 and heel area 6, the effect of a cushioning element additionally arranged in the heel area 6 of the shoe bottom 34 can also be supported. This damping element can preferably be integrated in a midsole 37 which is on the outsole 35, see FIG 2a-c , is arranged.

Furthermore, the sub-area III 5 adjoins the web 17 and the sub-area II 4 counter to the longitudinal direction 15 . Section III 5 is connected in one piece to section I 3 via web 17 . The two sections I, III 3, 5 consist of the same material and form the softer element, while section II 4 forms the harder element. Sub-area III 5 comprises the entire heel area 6 including the area of the arch of the foot 21. The surface 20 of sub-area III 5 extends over the entire heel area 6. Sub-area III 5 is divided on the one hand from the inner foot area 13, the foot outer area 9 and on the other hand from the partial area II 4 enclosed, with the sub-area III 5 merging into the sub-area I 3 via the web 17 in the outer foot area 9 . The two sections I 3 and III 5 form a closed surface, with section I 3 and section III 5 comprising the elastic part of the base body 2 with the lower flexural rigidity. The partial area II 4 also forms a closed surface 18, which forms the less elastic part of the base body 2 with the higher flexural rigidity.

The peripheral edge 22 of portion II 4, which does not relate to the edge of the inner foot portion 13, is provided with an inventive sloping surface 23, which coincides with the inventive sloping surface 25 of the partial peripheral edge 24 of portion I 3, the partial peripheral edge 27 of the web 17 and the partial peripheral edge 28 of the portion III 5 corresponds. In partial area I 3 , it is not the edge along the outer foot area 9 that is provided with an inclined surface 25 , but rather only the partial peripheral edge 28 , which is in direct contact with the peripheral edge 22 of partial area II 4 . The same applies to the peripheral edge 22, which is in direct contact with the partial Peripheral edge 27 of the web 17 and with the partial peripheral edge 28 of the portion III 5 is. The peripheral edge 22 with the inclined surface 23 of the sub-area II 4 also runs along the side facing the web 17 and along the contact area 26 in the sub-area III 5. Ie, the peripheral edge 22 of the sub-area II 4 running in the base body 2 has an inclined surface 23 on. This inclined surface 23 corresponds to the peripheral edges of the partial areas I, III, 3, 5 in the base body 2. The peripheral edges of the partial areas I, III, 3, 5 also have inclined surfaces 25. However, the inclined surfaces 25 are arranged in the base body 2 only at the inner contact edges. The inner contact edges relate to the touching partial areas I, II, III 3, 4, 5 in the base body 2. Only these have sloping surfaces 23, 25. The inclined surfaces 23, 25 form larger connecting surfaces 29 between the contact edges or the peripheral edges 22, 24, 27, 28. The corresponding connecting surfaces 29 running around in the base body 2 overlap and form a larger contact area 26. Normally, two edges meet butt and form the contact area, which consists of a much smaller connection area. Due to the inventive overlapping of the contact edges, greater strength is achieved between the partial areas I, II, III, 3, 4, 5 that are connected to one another.

the 2 a - c FIG. 12 shows a shoe 31 with a layered structure 32 in a schematic representation in a sectional view. The layer structure 32 consists of at least one barrel 35, one intermediate 37, one inner 38 and one inventive undersole 1 1 The reference symbols shown are adopted here analogously. Also a partial description of the sole 1 from the 1 will for the in the 2a-2c shown undersole 1, adopted.

the inside 2a The shoe 31 shown has an upper 33 and a shoe bottom 34 . The shoe bottom 34 contains an outsole 35 with a profile 36 and an overlying midsole 37 which can have a cushioning element (not shown) in the heel area. An insole 38 (insole) is arranged above the midsole 37 . The inventive undersole 1 can be placed on this insole 38 .

According to the 2 B the shoe 31 has the following layer structure 32 . In this embodiment, a cover layer 39 can first be arranged above the insole 38, on which the inventive undersole 1 then comes to rest. In turn, an insole 40 can be arranged in the composite of the shoe bottom 34 above the undersole 1 .

In the 2c a third variant is shown, in which the undersole 1 is used above the insole 40 . Of course, other layer structures 32 are also possible. For example, not every shoe 31 contains a midsole 37 or a cover layer 39, etc. Basically, it is irrelevant which and how many layers the shoe bottom 34 contains in the composite. It is decisive that the inventive undersole 1 can be used in almost any shoe bottom 34 of a shoe 31 .

Reference List

1

insole

2

body

3

Section I

4

Section II

5

Section III

6

heel area

7

midfoot area

8th

toe

9

outer foot area

10

ball area

11

forefoot area

12

big toe area

13

foot inner area

14

toe area

15

longitudinal direction

16

transverse direction

17

web

18

Area II (v.4)

19

Area I (v.3)

20

Area III (v.5)

21

foot arch

22

Perimeter Edge II (v.4)

23

sloping surface II (v.4)

24

Perimeter Edge I (v.3)

25

inclined surface I (v.3)

26

contact area

27

Perimeter Edge (v.17)

28

Perimeter Edge III (v.5)

29

interface

30

parting line

31

shoe

32

layer structure

33

shaft

34

shoe floor

35

outsole

36

profile

37

midsole

38

insole

39

top layer

40

insole

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 202017101304 U1 [0003]
• DE 102009005190 A1 [0004]
• DE 102012214886 A1 [0006]
• DE 102014015920 A1 [0006]
• DE 202011103699 U1 [0007, 0008]
• DE 102020106260 A1 [0008, 0012]

Claims (9)

Undersole for feet as an active arrangement in the layer structure of a shoe bottom, which as a replaceable, dimensionally stable undersole (1) comprises an undersole underside and an undersole upper side, the contact surface of the undersole underside lying above the insole and the contact surface of the undersole upper side pointing in the direction of the sole, characterized in that the plane-parallel spaced contact surfaces of the flat undersole (1) in the forefoot and ball of the foot area have at least two laterally adjacent sub-areas I, II (3, 4), which run transversely to the longitudinal direction (14) of the undersole (1) and have a sub-area III (5 ) which forms the heel area 6, which is located in front of the sub-areas I, II (3, 4), seen in the longitudinal direction (14) of the base body (2), with the sub-areas I, II (3, 4) due to different bending stiffness in the longitudinal (14) and transverse direction (15) of the undersole (1) below die. Undersole (1) according to claim 1 , characterized in that the three partial areas I, II, III (3, 4, 5) in the base body (2) have different sizes. Undersole (1) according to claim 2 , characterized in that sub-area I (3) and sub-area III (5) are connected to one another in one piece via a web (16), the two sub-areas I, III (3, 5) having the same area as sub-area II (4). form a larger proportion in the base body (2), with the two sub-areas I, III (3, 5) extending from the heel area (6) over the metatarsal area (7) and over the bridge (16), along the outer area (9) of the foot to the tip of the foot (8) extend. Undersole (1) according to claim 2 , characterized in that the partial area II (4) forms the smaller part of the base body (2) in terms of surface area, which extends from the ball of the foot area (10) via the forefoot area (11) to the big toe area (12), along the inner foot area (13), extends. Undersole (1) according to claim 1 - 4 , characterized in that the two sections I, III (3, 5) have a higher flexural rigidity and section II (4) has a lower flexural rigidity due to the different degrees of hardness in the material. Undersole (1) according to claim 5 , characterized in that the material of sub-areas I, III (3, 5) has the same degree of hardness and forms the softer component of the base body (2) with a low degree of hardness compared to the material of sub-area II (4), which has a greater degree of hardness and thus forms a harder component. Undersole (1) according to claim 6 , characterized in that the material of the partial areas I, II, III of the base body (2) is a plastic, preferably a thermoplastic polyurethane. Undersole (1) according to claim 7 , characterized in that the material from part II (4) of the base body (2) is glass fiber reinforced. Undersole (1) according to claim 7 , characterized in that the in the base body (2) internal contact edges of the touching sub-areas I, II, III (3, 4, 5) have overlapping sloping surfaces which correspond to each other.

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