DE202013003797U1 - insole - Google Patents

Abstract

An insole (10) for a shoe which extends over at least the forefoot region (12), preferably the entire foot region (12, 14, 16), of the sole, with a spring steel plate (22, 50) in the transverse direction of the sole, in particular in the rolling region the sole is rigid, on the other hand vertically flexible in the sole longitudinal direction and elastically resets after loading, wherein the spring steel plate (22, 50) substantially over the entire sole region a preferably perpendicular, running to the sole longitudinal direction transverse profile (28, 30, 55), and with a plastic layer, in which the spring steel plate (22, 50) is arranged, characterized in that the plastic layer is a polyurethane gel layer (18) with a Shore hardness 00 of 45-70, the polyurethane gel layer (18) at least the entire cross profile (28, 30, 55) of the spring steel plate (22, 50) fills and adheres to the spring steel plate (22, 50) and the thickness of the polyurethane gel layer (18) the 1.5-4 times the total height H of the transverse profile (28, 30, 55).

Description

The innovation relates to an insole for a shoe that extends at least over the forefoot, preferably the entire foot, the sole, with a spring steel plate, the bending stiff in the transverse direction of the sole, especially in Abrollbereich the sole, however, in the longitudinal direction of the sole is bendable vertically and after Resetting load elastically, wherein the spring steel plate has over the entire sole region a preferably perpendicular, running to the sole longitudinal direction transverse profile, and with a plastic layer in which the spring steel plate is arranged.

Such insoles are from the EP 373 336 A1 and EP 1 189 527 A1 known.

They give the wearer of a shoe a comfortable fit, because the insoles give due to their stability of the sole of a shoe a higher stability than conventional soles. Furthermore, the high spring force of the spring steel of the insole gives an improved ride, since the spring and Rückstelleingenschaften the metal material have a favorable effect on the Gehbefinden the wearer.

However, a disadvantage of a spring steel material is its limited shock absorption property, i. H. the energy applied to the spring steel material by a falling part of the weight is absorbed only to a limited extent by such a metal plate, the remaining energy being dissipated via the spring back of the metal plate to the rebounding part of the weight.

Transferred to such in-shoe insole, for the wearer, means that the shoe rebounds when running, with the rebound energy delivered being introduced into and absorbed by the foot of the wearer.

Leads by reference ASTM F 1976 a shock absorption test, so you put on a spring steel sole according to EP373336 For example, depending on the measurement of shock in the bale or heel area, approximately 61% and 60%, respectively, of the energy applied to the metal material will be absorbed, while the rest of the energy will be returned to the rebounding part of the weight.

It is therefore desirable to have an improved insole with increased shock absorption properties, compared to the EP 373 336 A1 described insole made of a metallic spring material.

In order to improve the shock absorption ability, gel shoe inserts have been proposed as a shoe insole. Such shoe insoles are shown for example in "Plastics" Issue 8 (2005), page 56-58. Other shoe insoles made of a gel are in the DE 20 2005 005011U1 described.

Gel materials have the property that they are not only compressed as plastic foams when pressure is applied, but also dodge sideways and thus deform elastically in all three spatial directions and reset after relief again on the nature of the memory effect. Parts of the gel molecules are quasi-liquid and flowable within the remaining gel matrix. They are partly chemically bound, partly physically held on the matrix in a highly complex equilibrium process and are deformed under pressure loading under deformation of the matrix. This deformation is essentially reversible and thus leads to absorption and absorption of the transmitted kinetic energy of the impacting body when loaded.

An analogous test, as described above, has now shown that the shock absorption quality of an insole made of gel material alone does not have a significantly better absorption behavior than the metal sole alone. Thus, a gel sole in the ball / heel area absorbs about 65% or 63% of the energy input according to the test mentioned above.

The novelty is therefore based on the object to provide an insole of the type mentioned above, which has an improved shock absorption behavior.

The object is achieved by the characterizing features of claim 1.

Surprisingly, innovation has shown that the embedding of a spring steel sole in a gel layer, wherein the gel completely envelops the metal layer, surprisingly raises the shock absorption properties of this combination sole to 73.8% in the ball area and 76.1% in the heel area.

This fact was not to be expected for the expert, who would have counted on this combination, possibly with a value of 61-63% in the bile area / heel area.

For the preparation of soft solid gels polyurethane components can be used, as in the EP 57 838 A1 and EP 511 570 A1 are described. In this case, two components, namely an isocyanate component and a Polyol component used, the usual way in the one-shot process mixed and then processed during the pot life.

• a) einem oder mehreren Polyolen mit Hydroxylzahlen unter 112 und
• b) einem oder mehreren Polyolen mit Hydroxylzahlen im Bereich 112–600, wobei das Gewichtsverhältnis der Komponente a zur Komponente b zwischen 90:10 und 10:90 liegt, die Isocyanatkennzahl des Reaktionsgemisches im Bereich von 15–59,81 liegt und das Produkt aus Isocyanat – Funktionalität und Funktionalität der Polyol-Komponente mindestens 6,15 beträgt.

Advantageously, the polyurethane gel is prepared from prepolymers in which the product of isocyanate functionality and functionality of the polyol component is at least 5.2, preferably at least 6.5. Based on the weight ratio, this ratio is advantageously 1: 6.5-1: 8. In a particularly preferred embodiment, the polyol component for the preparation of the gel consists of a mixture of

• a) one or more polyols having hydroxyl numbers below 112 and
• b) one or more polyols having hydroxyl numbers in the range 112-600, wherein the weight ratio of component a to component b is between 90:10 and 10:90, the isocyanate index of the reaction mixture in the range of 15-59,81 and the product of Isocyanate functionality and functionality of the polyol component is at least 6.15.

• a) einem oder mehreren Polyisocyanaten
• b) einer Polyol-Komponente bestehend aus einem oder mehreren Polyolen (b1) mit Hydroxylzahlen unter 112 und einem oder mehreren Polyolen (b2) mit Hydroxylzahlen im Bereich von 12 bis 600 und
• c) ggf. einem Katalysator für die Reaktion zwischen Isocyanat- und Hydroxylgruppen und
• d) ggf. aus der Polyurethanchemie an sich bekannten Füll- und/oder Zusatzstoffen, wobei das Gewichtsverhältnis der Komponenten (b1) zur Komponente (b2) zwischen 90:10 und 10:90 liegt, die Isocyanat-Kennzahl des Reaktionsgemisches im Bereich von 15–59,81 liegt und das Produkt aus Isocyanat Funktionalität und Funktionalität der Polyol-Komponente mindestens 6,15 beträgt.

In a further advantageous embodiment, the raw materials consist of the preparation of the gel

• a) one or more polyisocyanates
• b) a polyol component consisting of one or more polyols (b1) having hydroxyl numbers below 112 and one or more polyols (b2) having hydroxyl numbers in the range of 12 to 600 and
• c) optionally a catalyst for the reaction between isocyanate and hydroxyl groups and
• d) optionally from polyurethane chemistry per se known fillers and / or additives, wherein the weight ratio of components (b1) to component (b2) is between 90:10 and 10:90, the isocyanate index of the reaction mixture in the range of 15 -59.81 and the product of isocyanate functionality and functionality of the polyol component is at least 6.15.

In a further embodiment, the polyol component consists of one or more polyols having a molecular weight between 1,000 and 12,000 and an OH number between 20 and 112, wherein the product of the functionalities of the polyurethane-forming components is at least 5.2 and the isocyanate index is between 15 and 60 is located.

As isocyanates may be used for gel preparation preferably those of the formula Q (NCO) n, wherein the letter n is 2 to 4 and Q is an aliphatic hydrocarbon radical having 8-18 C-atoms, a cycloaliphatic hydrocarbon radical having 4-15 C-atoms or an aromatic hydrocarbon radical having 8-15 carbon atoms. The isocyanates can be present either in pure form or as modified isocyanate.

In addition, fillers and / or additives known from polyurethane chemistry may be added in a total amount of up to 50% by weight, based on the total weight of the gel mass.

As already mentioned above, in a preferred embodiment, the weight ratio of the polyisocyanate component to the polyol component is 1: 6.5 to 1: 8. This leads with increasing weight ratio to an ever softer elastic solid gel. It falls with increasing weight ratio, the Shore hardness 00 (measured after ASTM D 2240 ) from about 80 to about 35 at room temperature.

The inventive Shore-hardening 00 are in a range of 45-70, in particular 52-64 at room temperature and are after ASTM D 2240 certainly.

In the process for producing the gel according to the invention, the isocyanate component and the polyol component are mixed together in the one-shot process, wherein the resulting mixture has to be processed and poured into the mold within the pot life (usually 5-15 minutes).

The choice of the mixing ratio of the polyisocyanate component and polyol component depends on the desired hardness of the gel, wherein the specific structure of the materials used and optionally an added catalyst, the effect of which has an increased hardness value of the gel result is observed. Finally, one skilled in the art will empirically determine the mixing ratio and mixing parameters to arrive at the desired hardness value of the gel.

The integrated sole of gel and metal plate is made in a conventional casting process in a conventional form, such as used in gel manufacture. The composite formed in the inventive sole has improved spring and cushioning properties over those of the individual materials, resulting in an improvement in the shock absorbency properties of the inventive sole.

Advantageously, the sole made of gel and metal plate at least on one side an outer cover layer, which is impermeable to the polyurethane gel.

Such a cover layer may consist of a film, leather, synthetic leather or a textile material, for example a microfiber material impermeable to the PU gel. Preferably, the cover material used is leather or a plastic material simulated to the leather. The cover layer not only pursues the purpose of serving for the comfort of the shoe user, but also for the stabilization of the gel surface in the action of the underside of the foot in the state of use.

• a) Man giesst während der Topfzeit einen ersten Teil der flüssigen, noch nicht durchgehärteten Gel-Masse in eine Form unter Bildung einer ersten Gelschicht, die auf ihrer Oberfläche die üblichen klebrigen Eigenschaften aufweist.
• b) Auf die erste Gelschicht wird die Metallplatte aufgelegt und mit sanftem Druck in die Gelschicht gedrückt.
• c) Nach dem Auflegen der Metallplatte wird eine zweite Gelschicht in der Form auf die Metallplatte aufgetragen.
• d) Gegebenenfalls wird auf die noch klebrige zweite Gelschicht eine Abdeckschicht aufgelegt bzw. die Abdeckschicht wird in einer zweiten Ausführungsform vor dem Eintrag der ersten Gelschicht in die Form eingelegt, woraufhin die Gelmasse für die erste Gelschicht in die Form eingeführt wird.

The novel process for the production of the integrated gel and metal plate sole comprises a casting process in which the following steps are carried out in a first embodiment:

• a) Pouring during the pot life, a first part of the liquid, not yet cured gel mass in a mold to form a first gel layer having on its surface the usual sticky properties.
• b) On the first gel layer, the metal plate is placed and pressed with gentle pressure in the gel layer.
• c) After placing the metal plate, a second layer of gel in the mold is applied to the metal plate.
• d) Optionally, a cover layer is placed on the still tacky second gel layer or the cover layer is inserted in a second embodiment before the entry of the first gel layer in the mold, after which the gel mass for the first gel layer is introduced into the mold.

In a further embodiment of the manufacturing method, the metal plate is arranged in a mold so that both a top layer and a bottom layer of gel can be formed. After arranging the metal plate in the mold, the gel is then continuously introduced into the entire mold while displacing the air or into a mold evacuated from air, so that the molded body is formed in situ.

The inventive insole has a sole made essentially of spring steel and gel, which is usually used as a separate support sole in the shoe. On the other hand, however, this insole can be used as an insole with appropriate design of the edges.

The spring steel sole used as an inlay within the gel bed is flexible in the longitudinal direction and stiff in the transverse direction and usually cushions the foot in its bile region. In addition, a transverse or wave profile supports the rolling of the foot.

According to its first embodiment, the support sole grasps only the front ball area, while a second embodiment covers the entire foot with front area and heel area. It is anatomically adjusted according to the shape of the shoe or the shape of the foot, so available in sizes corresponding to the different shoe sizes. The transverse profiling may extend over both the forefoot and heel regions. In this case, the transverse profile advantageously proceeds in the manner of a sine wave, the size of the total height being 0.5-2 mm, advantageously about 1.3-1.6 mm. The wavelength of the wave is advantageously 3-5 mm, preferably 7-12, in particular about 10 mm.

The transverse profiling itself preferably runs at least in the forefoot area at a specific first angle to the longitudinal direction of the sole, in particular between 70 ° -90 °, advantageously between 75 ° and 80 °. Even in the heel area, the transverse profiling can extend at these angles.

In order to support a natural rolling movement, the waves in the rear or rear foot region (heel region) can also extend at a second angle deviating from the first angle, which is preferably between 90 ° and 110 °.

According to a further preferred embodiment, the angle in both areas (forefoot and hindfoot area) is approximately 90 °.

The spring-elastic hard plate material has a uniform thickness of 0.1-0.6 mm, preferably about 0.2 mm-0.4 mm, more preferably 0.25 mm-0.35 mm.

According to a further embodiment, the transverse and / or longitudinal profiling can also have a different shape in cross section, for example a groove, groove, rib, gutter, corrugation or bead shape.

In the novel composite panel material, the respective troughs of the transverse profiling are completely filled with the PU gel, wherein the thickness of the gel layer is additionally greater than the total height of the transverse profile. Advantageously, the thickness of the gel layer is uniform, so that the composite sole has a flat and smooth surface both on its upper side and its underside with a completely smooth structure.

The overall height of the transverse profiling of the spring steel plate itself is between 0.5 and 2.5 mm, preferably at 1-2 mm, in particular at about 1.5 mm.

Furthermore, the thickness of the gel layer is 1.5-4 times, in particular 1.8-3.5 times, particularly preferably approximately 2.5-3 times, based on the total height of the transverse profiling.

The term "total height" is to be understood as indicating the height of a profile of any kind extending out of the plane.

In a particularly preferred embodiment, the total height of the profile including the plate thickness is about 1.5 mm and the total thickness of the gel is about 4 mm, wherein the thickness of the spring steel plate is about 0.3 mm.

While according to a first embodiment, the spring steel plate is arranged with their respective wave crests at equal distances to the upper and lower outer surfaces of the PU layer in the gel layer, so the gel layer by the same amount d1 and d2 respectively on the bottom and top of the profile , according to a second embodiment, the size of the protruding layers d1 and d2 may be different. In each case d1 and d2 of the gel layers as well as the total height H of the profile are measured. The ratio of d1: H or d2: H can assume an amount of 0.5: 1 to 1.5: 1, preferably 0.8: 1 to 1.2: 1.

According to a further preferred embodiment, the rigid plate-shaped material is completely surrounded by a gel edge, which thus surrounds the side edges of the plate material substantially annular. As a result, a complete sheathing of the plate-shaped material is achieved, thus achieving a further stabilization of this composite arrangement. Due to its adhesiveness during the polymerization phase, the cured gel has high adhesion to the plate-shaped material and can only be detached from the spring steel plate by destroying the entire arrangement. If the plate-shaped material is deformed in the longitudinal direction while walking, the gel layer is compressed on the upper side of the plate and stretched on the underside, so that the recoverability of the plate-shaped material is improved from the deformed state to the initial state. In the process, the gel layer does not detach from the metal surface during compression nor during stretching and remains adherent there.

It can be used with the innovation insole all sorts of shoes, here not only low shoes, but also boots, high shoes and the like are understood. The sole itself supports and protects the arch of the foot and offers protection in the ball area, whereby the foot is less fatigued due to the improved shock absorption capacity of the load pressure.

Furthermore, the innovative sole for normal shoes, such as road and running shoes, especially sports shoes can be used. It has a performance-enhancing and health-protective effect. Likewise, the rigid plate structure prevents the risk of injury to feet, especially in the working area.

Other features and advantages of the invention are the subject of the following description and the drawings of exemplary embodiments.

Show it

1 a plan view of the underside of an insole with forefoot and heel area

2 another plan view of the underside of an insole for the forefoot and

3 an enlarged sectional view taken along the line A-A through the insole gem. 1 ,

In 1 is an insole 10 shown from the bottom, which has a forefoot area 12 , a midfoot area 14 and a heel area 16 and a longitudinal axis LL.

The insole 10 has as the first component a PU gel layer 18 on, its edge 20 the outer boundary of the insole 10 represents.

The PU gel layer 18 is essentially transparent, so that a spring steel insert 22 with its outline 24 , which is the outer boundary of the spring steel insert 22 is apparent. The spring steel insert 22 extends substantially parallel to the edge 20 the PU gel layer 18 , being between the outline 24 and the edge 20 an intermediate edge area 26 made of PU gel.

Due to the transparent structure of the PU gel are first transverse profiles 28 in the forefoot area 12 and second transverse profiles 30 in the heel area 16 seen.

The profiles 28 / 30 extend at an angle α to the longitudinal axis LL.

In 2 is a second insole 40 represents only the forefoot area 12 detected. As a result, the same reference numerals as in 1 used.

Only the edge 44 extends only in the forefoot area 12 ,

Likewise, the second spring steel insert extends 42 only in the forefoot area.

In 3 is an enlarged sectional view through the insole 10 according to 1 shown. With 50 The spring steel insert is shown as having a wavy structure with wave crests 52 and troughs 54 as a profile 55 having. The distance H of the wave crests from the troughs corresponds to the height of the profile 55 ,

Similarly, the length of a wave corresponds to the distance W.

The spring steel insert 50 is in a PU gel layer 56 embedded, which has a thickness S. It extends on the bottom by the thickness d1 over the trough 54 the spring steel insert 50 on the bottom. Similarly, the supernatant of the PU gel layer 56 above the wave mountain 52 the spring steel insert 50 the thickness d2.

Consequently, therefore, the total thickness S of the PU gel layer 50 the amount H plus the d1 plus d2.

In the example case according to 3 d2 is greater than d1.

Furthermore, the insole 10 according to 3 on its top one stuck with the PU gel layer 56 Connected cover layer 58 on, which consists of leather or a plastic layer, such as microfiber view.

When measuring physical parameters, the following test methods are used.

In the shock absorption (impact test) was based on ASTM F 1976 Tests performed on the heel and bile area. Here, the impact of the human foot on the ground is simulated using a free-falling mass of 7.5 kg. The impact of the free-falling mass on the test specimen takes place at a precisely defined speed of 0.5 m / s. During the deformation of the material, the velocity of the falling mass decreases. The change in speed per unit time is a measure of the braking effect of the material.

When carrying out the experiment, the maximum acceleration of the mass is measured on contact with the test specimen and at the same time the penetration depth and the rebound height are determined. In addition, the absorbed energy, the emitted and absorbed energy are measured. Then u. a. calculated the percentage absorption ratio and the spring constant.

A spring steel sole, a gel sole and a combination sole made of gel, in which the spring steel sole is embedded, were used.

The spring steel sole has a thickness of 0.285 mm and a profile that extends over both the forefoot and the rear foot area with a total profile height of 1.5 mm and a wavelength of 1 cm.

The gel sole itself is 4 mm thick.

The spring steel soleplate is uniformly inserted into the combination insole with spring steel insert with a peripheral edge of approximately 5 mm, the gel extending over the total height of the profile on both sides by approximately 1.25 mm.

In the shock absorption measurement, the following absorption ratio for the front bale area resulted:
Spring steel sole 61,23%
Gel sole 64.99%
Gel sole with integrated spring steel sole 72.84%.

In the heel area, the following shock absorption values were obtained:
Spring steel sole 59.85%
Gel sole 63.33%
Gel sole with integrated steel sole 76,12%.

The spring constant is measured in N / mm. The following values for the ball area / heel area resulted:
Spring steel sole 2959,56 / 3792,82
Gel sole 2008,97 / 2042,34
Gel sole with integrated steel sole 2483,38 / 2909,34.

On the gel soles with integrated spring steel sole, the flexural strength according to DIN EN 12568 / DIN EN ISO 20344 / DIN EN ISO 20345 checked.

There were no damage to the samples after 5 million bends.

LIST OF REFERENCE NUMBERS

10

insole

12

forefoot

14

midfoot

16

heel

18

PU gel layer

20

edge

22

Spring steel insert

24

outline

26

Between the edge region

28

first profile

30

second profile

40

insole

42

Spring steel insert

44

edge

50

Spring steel insert

52

Wellenberg

54

trough

55

profile

56

PU gel layer

58

covering

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• EP 373336 A1 [0002, 0007]
• EP 1189527 A1 [0002]
• EP 373336 [0006]
• DE 202005 [0008]
• EP 57838 A1 [0015]
• EP 511570 A1 [0015]

Cited non-patent literature

• ASTM F 1976 [0006]
• ASTM D 2240 [0021]
• ASTM D 2240 [0022]
• ASTM F 1976 [0067]
• DIN EN 12568 [0076]
• DIN EN ISO 20344 [0076]
• DIN EN ISO 20345 [0076]

Claims (8)

Insole ( 10 ) for a shoe extending at least over the forefoot area ( 12 ), preferably the entire foot area ( 12 . 14 . 16 ), the sole extends, with a spring steel plate ( 22 . 50 ), which in the sole transverse direction, in particular in the Abrollbereich the sole is rigid, on the other hand in the longitudinal direction of the sole vertically bendable and elastically resets after loading, the spring steel plate ( 22 . 50 ) substantially over the entire sole region a preferably perpendicular, running to the sole longitudinal direction transverse profile ( 28 . 30 . 55 ), and with a plastic layer in which the spring steel plate ( 22 . 50 ), characterized in that the plastic layer comprises a polyurethane gel layer ( 18 ) with a Shore hardness 00 of 45-70, the polyurethane gel layer ( 18 ) at least the entire transverse profile ( 28 . 30 . 55 ) of the spring steel plate ( 22 . 50 ) and on the spring steel plate ( 22 . 50 ) and the thickness of the polyurethane gel layer ( 18 ) 1.5-4 times the total height H of the transverse profile ( 28 . 30 . 55 ) is. Insole according to claim 1, characterized in that the Shore hardness 00 52-64. Insole according to claim 1 or 2, characterized in that the thickness of the gel layer ( 18 ) 1.8-2.5 times, preferably 2.5-3 times the total height of the transverse profile ( 28 . 30 . 55 ) is. Insole according to one of claims 1-3, characterized in that the transverse profile ( 28 . 30 . 55 ) is wave-shaped, the overall height of the profile ( 28 . 30 . 55 ) 0.5-2 mm is advantageously 1.3-1.6 mm and the wavelength of the shaft is 3-15 mm, preferably 7-12 mm. Insole according to one of claims 1-4, characterized in that the gel layer ( 18 ) each on the top and bottom of the transverse profile ( 28 . 30 . 55 ) with uniform spacing and forms a substantially flat and smooth surface. Insole according to one of claims 1-4, characterized in that the gel layer ( 18 ) each with different distances on the top or bottom of the transverse profile ( 28 . 30 . 55 ) survives. Insole according to one of claims 1-6, characterized in that the edge of the spring steel plate ( 22 . 50 ) from an intermediate edge region ( 26 ) is surrounded by polyurethane gel. Insole according to one of claims 1-7, characterized in that a covering layer ( 58 ) on the surface of the polyurethane gel layer ( 18 ) is fixed.

Images