Improved sole construction and article of footwear having a sole comprising such an improved sole construction

Abstract

Improved sole construction and footwear articles with a sole having such an improved sole construction. The invention relates to a sole construction (1) comprising a lower wear sole (3), (ii) an upper clean sole, and (iii) an intermediate sole (5) arranged between the lower wear sole and the upper clean sole. The intermediate sole (5) consists of three layers of different materials (6, 7 and 8) arranged one above the other in a multilayer sandwich structure with complementary shapes, the middle layer (7) acting as a connecting layer between the lower and upper layers (6 and 8).The middle layer (7) has a continuous structure (7') which, however, appears segmented and consists of at least three successive sole sections (7") that partially overlap and form material thickenings (7‴) or ribs at the interconnected overlapping edges, extending transversely to the longitudinal axis. The Shore A hardness of the material of the middle layer (7) of the midsole (5) is lower than the Shore A hardness of the material of the lower layer (6) of this midsole (5) and lower than the Shore A hardness of the material of the upper layer (8).

Description

[0001] The present invention relates to the field of footwear, in particular sports shoes, city shoes or hiking shoes, and especially to the sole constructions for such footwear. The object of the invention is to offer an improved sole construction and a footwear product or shoe with a sole that incorporates such a sole construction.

[0002] Numerous proposals for soles with special sole constructions are already known, which aim to improve the walking comfort of the wearer of the footwear articles with these soles.

[0003] Several criteria must be considered, including in particular: shock absorption capacity, energy return through a spring or elastic effect after pressure (rebound), support for the foot's rolling motion during walking, potential promotion of forward movement, good stance stability, and / or good lateral support of the foot during walking. Furthermore, the sole's properties should be adapted to the specific characteristics of the respective contact areas, and a distinction should be made, in particular, between the anterior support region (forefoot) and the posterior support region (heel).

[0004] To meet at least some of these comfort criteria, insoles with one or more inserts made of specific materials and / or one or more chambers, either empty or filled with pressurized gas, have been proposed (see US 2011 / 179669, WO 1998 / 014085, and US 2019 / 0216169, for example). However, the resulting effect is often spatially limited (localized effect) and temporally limited (non-permanent effect). Furthermore, the manufacture of these insoles is complex, and their structural coherence is limited.

[0005] Soles have also been proposed that feature a lower surface in contact with the ground, equipped with formations that deform under pressure (during walking or running) (see US 2013 / 0047474, for example). However, this type of sole loses effectiveness due to the inevitable incorporation of stones, soil, and other materials lying on the ground, and in any case, over time (wear and tear).

[0006] Furthermore, sole constructions are also known in which an intermediate sole is arranged between the lower wear sole and the upper Strobel quilted sole of the upper (cleaning sole). This intermediate sole connects the two aforementioned soles and has at least one layer of a material with cushioning and / or energy return properties. This intermediate sole consists either of several flat layers of different materials arranged one on top of the other (CN 108903127, for example), or of two layers of different materials whose mutually contacting and interconnected surfaces are not flat (see US 2011 / 0072690, US 2021 / 315319, and US 4798010, for example). These known solutions, although they meet some of the aforementioned criteria, are complex to manufacture, result in considerable sole thicknesses that can impair foot stability, and require large quantities of material (high manufacturing costs).Furthermore, all the aforementioned known solutions with midsoles do not optimally and fully utilize the cushioning and energy return properties of the materials due to the local distribution of the applied pressure forces (during walking). Moreover, integrating a layer with the aforementioned properties into the sole often leads to a significant reduction in the structural coherence as well as the longitudinal and lateral stability of that sole, especially if this layer has a considerable thickness, which is necessary in the aforementioned known soles to exhibit the advantageous properties.

[0007] The present invention aims to overcome at least most of the limitations of the above-mentioned known solutions.

[0008] For this purpose, the invention relates to a sole construction according to the preamble of claim 1 and which also has the features of the characterizing part of claim 1.

[0009] Further features and developments of the invention are specified in the dependent claims.

[0010] The invention is better understood by the following description, which relates to a preferred embodiment that is not limiting and is explained with reference to the accompanying schematic drawings, in which: [ Fig. 1A], [Fig. 1B], [Fig. 1C] and [Fig. 1D ] are each a bottom view, an inner side view, an outer side view and a rear view of a sole construction for a shoe article for the right foot according to the invention; [ Fig. 2 ] is an exploded view in lateral elevation and perspective of the in Figure 1 depicted sole construction, without Strobel or cleanliness sole; [ Fig. 3A], [Fig. 3B], [Fig. 3C] and [Fig. 3D These are bottom views of the various constituent parts of a prototype of the in Figure 1depicted sole construction; namely, material realizations of the wear sole and the lower, middle, and upper layers of the midsole; [ Fig. 4 ] is a sectional view of the in Figure 1A depicted sole construction, along the section plane arranged perpendicular to the contact surface with the ground and containing the longitudinal axis or anterior-posterior axis of the sole construction; [ Fig. 5A], [Fig. 5B], [Fig. 5C] and [Fig. 5D ] are sectional views along B-B1, C-C1, D-D1 and E-E1 of the sections shown in the Figures 1A, 1B, 1C and 4 illustrated sole construction; [ Fig. 6 ] represents a lateral elevation of a shoe article that includes a sole construction according to the invention.

[0011] The Figures 1 to 5 show a sole construction (1) for a shoe article (2), in particular for sports shoes, city shoes or hiking shoes, e.g. for a shoe (2) as it is in Figure 6 is shown.

[0012] This sole construction (1) has an anterior support region (1') and a posterior support region (1").

[0013] This sole construction (1) includes: i) a lower wear sole or layer (3) having a predominantly flat lower contact surface (3') with the ground, ii) an upper Strobel or clean sole or layer (4) intended to come into contact with the foot of the wearer of the footwear article (2), and iii) an intermediate sole (5) arranged between the lower wear sole or layer (3) and the upper Strobel or clean sole or layer (4) and in planar contact with each of them.

[0014] According to the invention, this sole construction (1) is characterized by: that the midsole (5) consists of three layers of different materials (6, 7 and 8), each of which runs continuously over the entire length of the sole construction (1) and is arranged one above the other in a multilayer sandwich structure with complementary shapes, the middle layer (7) acting as a connecting layer between the lower and upper layers (6 and 8), that the middle layer (7) has a continuous structure (7') which, however, appears segmented and consists of at least three successive planar sole sections (7") that partially overlap and form material thickenings (7‴) or ribs at the interconnected overlapping edges, extending transversely to the longitudinal axis (AL),and that the Shore A hardness of the material of the middle layer (7) of the midsole (5) is lower than the Shore A hardness of the material of the lower layer (6) of this midsole (5) and lower than the Shore A hardness of the material of the upper layer (8).

[0015] Thanks to the aforementioned features of the invention, a sole (1) is obtained which, due to the non-planar geometry of the middle or intermediate layer (7) and its close embedding between the two other layers (6 and 8), exhibits very good structural coherence and stability for the wearer. By clamping the middle layer (7) between the upper and lower layers (8 and 6), which have a higher hardness, the special properties of the material of this middle layer (7) can be optimally utilized by distributing loads and pressures over a surface area. This improved utilization of the energy absorption and shock-absorbing properties of this middle layer (7), particularly due to its lower hardness, makes it possible to require less material (thinner layer) for a similar effect and thus further improve stability (thinner sole and less material, which is more flexible).The presence of thickenings in the middle layer (7) allows for two-stage cushioning and energy absorption, compared to the thinner, flat sections of the sole (7"). The segmented structure of the middle layer (7), which is also reflected in the shape of the two other layers (6 and 8) closely connected to it, further facilitates easier and more controlled rolling of the sole during walking.

[0016] According to a feature of the invention, the middle layer (7) has a profiled structure in a direction perpendicular to the cutting plane (PC) from one lateral side (5', 5") to the other (5", 5') of the midsole (5).

[0017] As from the Figure 4As can be seen in a sectional view along a section plane (PC) perpendicular to the contact surface (3') with the ground and containing the longitudinal axis (AL) of the sole construction (1), the segmented-appearing continuous structure (7') forms a sawtooth configuration with at least three interconnected teeth (9), each tooth having a first segment (9') with a positive or increasing inclination in the rearward direction of the longitudinal axis (AL), and a second segment (9") oriented substantially perpendicular to the contact surface (3') with the ground, this sawtooth configuration (7') having the shape of a zigzag band or a slightly curved stylized lightning bolt, and the second segments (9") each corresponding to material thickenings (7‴) (on average). This forward-leaning (direction of locomotion) sole construction promotes forward motion when walking or running.

[0018] In order to achieve a smoother transition between the different material thicknesses and to avoid weakening the construction through lines or edges, the teeth (9) of the sawtooth configuration (7') are provided to have a blunt aspect with rounded angles, and the middle layer (7) thus exhibits a segmented structure (7') consisting mainly of sole sections (7") as transverse strip parts corresponding to the first segments (9') and each of which is connected to material thickenings (7‴) corresponding to the second segments (9").

[0019] Preferably, and how this is relatively straightforward from the Figures 4 and 5As can be seen, the value of the thickness of a material thickening (7‴), or the value of the height (h) of a vertical second segment (9") of a given tooth (9), can correspond to approximately 1.5 to 3.0 times, preferably approximately 2.0 to 2.5 times, the value of the average thickness (e) of the adjacent sole section (7") as a transverse strip part, or of the first segment (9') of this tooth (9).

[0020] As this can be seen from the Figures 1B, 1C , 2 and 4As can be seen, the sawtooth configuration (7') advantageously exhibits the appearance of a slightly curved, stylized lightning bolt, with the average thickness (e) of the inclined first segments (9') gradually decreasing in the anterior-posterior direction of the longitudinal axis (AL), depending on their position in the sequence of teeth (9) of the sawtooth configuration (7'), and with the height (h) and, if applicable, the width (e') of the perpendicular second segments (9") showing a similar decreasing development. This results in different efficiencies of damping and energy absorption, properties of the sole construction with significantly higher values ​​in the posterior support region (1") than in the anterior support region (1').

[0021] On their respective sides that are in contact with the middle layer (7), the lower (6) and upper (8) layers have surface configurations that are complementary to those of the middle layer (7). In other words, they compensate for the irregularities of the segmented structure of the middle layer (7) to create an essentially flat lower and upper side of the midsole (5) (see Figures 2 , 3 and 4 ).

[0022] In order to best adapt the lower (6) and upper (8) layers to their respective functions (contact with the foot - contact with the ground) without affecting their common role in relation to the middle layer (7), it can be provided that the Shore A hardness of the material of the upper layer (8) of the midsole (5) is lower than the Shore A hardness of the material of the lower layer (6) of this midsole (5).

[0023] It can also be provided that the Shore A hardness of the material of the lower layer (6) of the midsole (5) is lower than the Shore A hardness of the material of the lower wear sole or layer (3), which consists of one or more parts.

[0024] Advantageously, and in connection with a practical implementation of the invention, the materials of the various layers (6, 7 and 8) of the midsole (5) each have the following hardnesses: obere Schicht 8 : 40 < Shore A 8 < 45 mittlere Schicht 7 : 35 < = Shore A 7 < = 40 untere Schicht 6 : 45 < = Shore A 6 < = 50 , wherein the material of the lower wear sole or layer (3) has a Shore A hardness between 50 and 55.

[0025] Preferably, the aforementioned Shore A values ​​of the materials of the various aforementioned layers are located approximately in the middle of the respective specified value ranges.

[0026] As an appropriate choice of materials, for example, it may be provided that the material of the lower and upper layers (6 and 8) of the midsole (5) consists of ethylene vinyl acetate (EVA), and that the material of the middle layer (7) consists of supercritical polyurethane foam (SCF TPU), wherein the material of the lower wear sole or layer (3) is preferably made of rubber.

[0027] The material with the following designation is particularly suitable for the lower layer (6) and the upper layer: "XLR Ethylene-Vinyl acetate high elastic added foaming agent" and which has the following characteristics: Rebound: 55-58% Compression Deformation: 38-40% Visual density: 0.17-0.21 Mg / m3

[0028] The material with the following designation is particularly suitable for the middle layer (7): "Super critical nitrogen foaming of aliphatic thermoplastic polyurethane and ethylene-vinyl acetate blend" and exhibiting the following characteristics: Rebound: 66% Compression Deformation: 46.30% Visual density: 0.09 Mg / m³

[0029] As can be seen from the example shown, the middle layer (7) in an elongated sectional view (along the PC plane) preferably has a sawtooth configuration with four successive and interconnected teeth (9), with two teeth in the rear support region (1") and two teeth in the front support region (1'), wherein the rear teeth have shorter, inclined first segments (9') and longer, perpendicular second segments (9") compared to the front teeth, wherein the material layer of the middle layer (7) has a greater thickness in the rear support region (1") than in the front support region (1'), and the average thickness (e) of the inclined first segments (9'), or sole sections (7"), as well as the height (h) of the perpendicular second segments (9"), or material thickenings (7‴), gradually decrease towards the front. The Figures 1 to 4 and 6The sole construction shown (1) thus has five sole sections (7") and four material thickenings or transverse ribs (7‴) (the front sole section is not preceded by a material thickening).

[0030] Each of the three layers (6, 7, 8) of the midsole (5) consists of a one-piece injection molded part.

[0031] Furthermore, the mechanical connection is secured by adhesive bonding through the interlocking of complementary shapes between the middle layer (7) and the lower layer (6) on the one hand and the middle layer (7) and the upper layer (8) on the other hand at the respective contact surfaces between them.

[0032] As particularly on the Figures 4 and 5 As can be seen, the inner upper surface of the upper layer (8) on which the foot rests is essentially flat and level, and extends parallel to the lower ground contact surface (3').

[0033] To further strengthen the overall strength of the sole construction (1) and especially to increase its stiffness and lateral resistance, the lower layer (6) and the middle layer (7) are each provided with edges (10) along the inner (5') and outer (5") lateral sides of the midsole (5), preferably with sections of edges of different heights, which protrude particularly at the crests of the material thickenings or ribs (7‴) or at the tips of the saw teeth (9), wherein the upper layer (8) and the middle layer (7) each have lateral recesses (11) which complementarily accommodate these edges or edge sections (10) in the assembled state of the three layers (6, 7, 8) of the midsole (5).

[0034] In order to enable unrestricted use of the advantageous properties of the middle layer material (7), the middle layer material (7) is visible on the inner (5') and outer (5") sides of the midsole (5) between the lower and upper layers (6 and 8) and can expand freely outwards when compressed between the lower and upper layers (6 and 8), these two layers (6 and 8) having Shore A hardness values ​​higher than that of the middle layer material (7).

[0035] To further improve the overall strength and stiffness of the sole construction (1), the lower layer (6) and the middle layer (7) can each be provided with a circular rim (12) on the rear side of the posterior support region (1"), wherein the upper layer (8) and the middle layer (7) each have a recess (13) which receives this rim (12) in a complementary manner when the three layers (6, 7, 8) of the midsole (5) are assembled.

[0036] Of course, the lower wear sole or layer (3) can be a single piece.

[0037] Advantageously, however, the lower wear sole or layer (3) has a discontinuous structure of at least two parts which are injected or glued onto the lower surface (5‴) of the midsole (5) and only partially cover this surface (5‴), namely only at the main support surfaces on the ground, and have rib patterns which have studs and form the contact surface (3') with the ground.

[0038] The invention also relates to (see Figure 6 ) on a shoe article, e.g. a shoe (2), in particular a sports shoe, city shoe or hiking shoe, with a sole (1) and an upper (14), characterized in that the sole corresponds to a sole construction (1) as described above.

[0039] In order to verify the advantages of the special sole construction according to the invention, comparative tests were carried out between, on the one hand, a sole or shoe with sole according to the invention (examples 1 and 2) with a middle layer (7) which has the above-mentioned special shape features, and, on the other hand, a sole or shoe with sole with the same material layers and similar average thicknesses, but with a substantially flat and non-zigzag-shaped middle layer (examples 3 and 4).

[0040] The results of the various comparative tests are listed below, indicating the respective side (right / left) of the tested sole, and also the affected support region (forefoot / heel). Lateral stiffness of the shoe (DIN EN 13634:2018-03)

[0041] The shoe is fixed between two parallel plates. These are moved towards each other at a constant speed, compressing the shoe laterally, i.e., perpendicular to its longitudinal axis. The force generated by a lateral deformation of 20 mm is then measured. High lateral stiffness was observed: The shoe with the inventive sole construction holds the foot more firmly in alignment, reduces lateral movement, and thus lowers the risk of ankle sprains (inversion trauma). parameter Unit Results Copies 1 and 2 right | left Copies 3 and 4 right | left deformation mm 20 maximum value of force N 590 | 597 515 | 548 Energy absorption of the sole (DIN EN ISO 20344:2024-06)

[0042] A defined force is applied to the heel area of ​​the shoe using a testing machine. The material compression (e.g., midsole, insole) is measured. The absorbed energy in joules can be calculated from the force and displacement measurements. The test is a quasi-static or slow dynamic compression test (simulating walking). High energy absorption equals significant cushioning while walking. The material absorbs a large portion of the applied forces, and the shoe is comfortable to walk in. Shock absorption of the sole (ASTM F 1976:2024)

[0043] A standardized drop stamp with a defined mass is dropped from a specified height onto the heel of a shoe resting on a solid surface. The force transmitted upon impact is measured. From the force and deformation, the absorbed energy is calculated in joules. This dynamic, sudden impact simulates the heel strike during running.

[0044] Negative acceleration indicates the maximum braking or deceleration rate measured upon impact with the sole.

[0045] The absorption ratio indicates the proportion of absorbed energy to the total impact (energy that is not transferred to the foot).

[0046] The spring constant (k) indicates how stiff or soft the sole reacts to a force (k = force / deformation).

[0047] As can be seen from these tables, the measured values ​​of the inventive soles, with the exception of some values ​​relating to the anterior support region, are significantly better than the measured values ​​of the "flat" soles (despite slight excess of material - material thickenings), and thus confirm the advantageous contribution of the specific structure and shapes of the midsole (5).

[0048] It must also be emphasized that both series of test prototypes (with the inventive soles and with the "flat" soles) despite a low average thickness of the sole construction (1) or the midsole (5) in the sole sections (7"): In the anterior support region: Total thickness: 20-28 mm; Thickness of the middle layer: 6-8 mm (in the sole sections 7", outside the ridges / thickenings); In the posterior support region: Total thickness: 35-40 mm; Thickness of the middle layer: 10-12 mm (in the sole sections 7", outside the ridges / thickenings); very good test results compared to existing, equivalent soles and shoes with greater sole thickness.

[0049] In connection with the Figures 4 and 5 The following thicknesses can be suggested as examples: Anterior support region Posterior support region Section B-B1 Section C-C1 Section D-D1 Section E-E1 layer mm mm mm mm upper layer 6,0 8,3 6,7 8,4 Middle layer 'Snake' 6,7 7,6 22,8 23,8 lower layer 10,0 12,4 6,9 7,5 Total thickness (WITHOUT rubber tread) 22,7 28,3 36,4 39,7

[0050] Of course, the invention is not limited to the embodiment described and illustrated in the accompanying drawings. Modifications are possible, particularly with regard to the composition of the various elements or by substituting technical equivalents, without departing from the scope of protection of the invention.

Claims

1. Sole construction (1) for a footwear article (2), in particular for sports shoes, city shoes or hiking shoes, comprising a front support region (1') and a rear support region (1"), wherein the sole construction (1) comprises i) a lower wear sole or layer (3) having a predominantly flat lower contact surface (3') with the ground, ii) an upper Strobel or clean sole or layer (4) intended to come into contact with the foot of the wearer of the footwear article (2), and iii) an intermediate sole (5) arranged between the lower wear sole or layer (3) and the upper Strobel or clean sole or layer (4) and in planar contact with each of them, sole construction (1), characterized by the fact thatthe midsole (5) consists of three layers of different materials (6, 7 and 8), each of which runs continuously over the entire length of the sole construction (1) and is arranged one above the other in a multilayer sandwich structure with complementary shapes, wherein the middle layer (7) acts as a connecting layer between the lower and upper layers (6 and 8), that the middle layer (7) has a continuous structure (7') which, however, appears segmented and consists of at least three successive sole sections (7") that partially overlap and form material thickenings (7‴) or ribs at the interconnected overlapping edges,which extend transversely to the longitudinal axis (AL) and that the Shore A hardness of the material of the middle layer (7) of the midsole (5) is less than the Shore A hardness of the material of the lower layer (6) of this midsole (5) and less than the Shore A hardness of the material of the upper layer (8).

2. Sole construction according to claim 1, characterized by the fact thatthe middle layer (7) has a profiled structure in a direction perpendicular to the section plane (PC) from one lateral side (5', 5") to the other (5", 5') of the midsole (5) and that, in a sectional view along a section plane (PC) which is perpendicular to the contact surface (3') with the ground and contains the longitudinal axis (AL) of the sole construction (1), the segmented-appearing continuous structure (7') forms a sawtooth configuration with at least three interconnected teeth (9), wherein each tooth has a first segment (9') with a positive or increasing inclination in the rear-forward direction of the longitudinal axis (AL), and a second segment (9") which is oriented substantially perpendicular to the contact surface (3') with the ground, wherein this sawtooth configuration (7') has the shape of a zigzag band or a slightly curved stylized lightning bolt and the second segments (9") each correspond to material thickenings (7‴).

3. Sole construction according to claim 2, characterized by the fact that the teeth (9) of the sawtooth configuration (7') have a blunt aspect with rounded angles and the middle layer (7) thus has a segmented structure (7') consisting mainly of sole sections (7") as transverse strip parts corresponding to the first segments (9') and each of which are connected to material thickenings (7‴) corresponding to the second segments (9").

4. Sole construction according to at least one of claims 2 and 3, characterized by the fact that The value of the thickness of a material thickening (7‴), or the value of the height (h) of a vertical second segment (9") of a given tooth (9), corresponds to approximately 1.5 to 3.0 times, preferably approximately 2.0 to 2.5 times, the value of the average thickness (e) of the adjacent sole section (7") as a transverse strip part, or of the first segment (9') of this tooth (9).

5. Sole construction according to at least one of claims 2 to 4, characterized by the fact that the sawtooth configuration (7') has the aspect of a slightly curved stylized lightning bolt, wherein the average thickness (e) of the inclined first segments (9') gradually decreases depending on their position in the sequence of teeth (9) of the sawtooth configuration (7') in the direction behind-forward of the longitudinal axis (AL), and wherein the height (h) and, if applicable, the width (e') of the perpendicular second segments (9") exhibit a similar decreasing development.

6. Sole construction according to at least one of claims 1 to 5, characterized by the fact that the Shore A hardness of the material of the upper layer (8) of the midsole (5) is less than the Shore A hardness of the material of the lower layer (6) of this midsole (5).

7. Sole construction according to at least one of claims 1 to 6, characterized by the fact thatthe Shore A hardness of the material of the lower layer (6) of the midsole (5) is less than the Shore A hardness of the material of the lower wear sole or layer (3), which consists of one or more parts.

8. Sole construction according to at least one of claims 1 to 7, characterized by the fact that The materials of the different layers (6, 7 and 8) of the midsole (5) each have the following hardnesses: - obere Schicht 8 : 40 < Shore A 8 < 45 - mittlere Schicht 7 : 35 < = Shore A 7 < = 40 - untere Schicht 6 : 45 < = Shore A 6 < = 50 , wherein the material of the lower wear sole or layer (3) has a Shore A hardness between 50 and 55.

9. Sole construction according to at least one of claims 1 to 8, characterized by the fact thatthe material of the lower and upper layers (6 and 8) of the midsole (5) consists of ethylene vinyl acetate (EVA), and that the material of the middle layer (7) consists of supercritical polyurethane foam (SCF TPU), wherein the material of the lower wear sole or layer (3) is preferably made of rubber.

10. Sole construction according to at least one of claims 2 to 9, characterized by the fact thatThe middle layer (7) in an elongated sectional view has a sawtooth configuration with four successive and interconnected teeth (9), with two teeth in the rear support region (1") and two teeth in the front support region (1'), wherein the rear teeth have shorter inclined first segments (9') and longer vertical second segments (9") compared to the front teeth, and wherein the material layer of the middle layer (7) in the rear support region (1") has a greater thickness than in the front support region (1') and the average thickness (e) of the inclined first segments (9'), or sole sections (7"), as well as the height (h) of the vertical second segments (9"), or material thickenings (7‴), gradually decrease towards the front.

11. Sole construction according to at least one of claims 1 to 10, characterized by the fact thatthe mechanical connections are secured by adhesive bonding at the respective contact surfaces between the middle layer (7) and the lower layer (6) on the one hand and the middle layer (7) and the upper layer (8) on the other hand, through positive locking of complementary shapes.

12. Sole construction according to at least one of claims 1 to 11, characterized by the fact that the lower layer (6) and the middle layer (7) are each provided with edges (10) along the inner (5') and outer (5") lateral sides of the midsole (5), preferably with sections of edges of different heights, which protrude particularly at the crests of the material thickenings or ribs (7‴), or at the tips of the saw teeth (9), wherein the upper layer (8) and the middle layer (7) each have lateral recesses (11) which receive these edges or edge sections (10) complementarily in the assembled state of the three layers (6, 7, 8) of the midsole (5).

13. Sole construction according to at least one of claims 1 to 12, characterized by the fact that the material of the middle layer (7) is visible on the inner (5') and outer (5") sides of the midsole (5) between the lower and upper layers (6 and 8) and can expand freely outwards when compressed between the lower and upper layers (6 and 8), these two layers (6 and 8) having Shore A hardness values ​​higher than the material of the middle layer (5).

14. Sole construction according to at least one of claims 1 to 13, characterized by the fact that the lower layer (6) and the middle layer (7) are each provided with a circular rim (12) on the rear side of the posterior support region (1"), wherein the upper layer (8) and the middle layer (7) each have a recess (13) which receives this rim (12) in a complementary manner when the three layers (6, 7, 8) of the midsole (5) are assembled.

15. Sole construction according to at least one of claims 1 to 14, characterized by the fact that the lower wear sole or layer (3) has a discontinuous structure of at least two parts which are injected or glued onto the lower surface (5‴) of the midsole (5) and only partially cover this surface (5‴), namely only at the main support surfaces on the ground, and have rib patterns which have studs and form the contact surface (3') with the ground.

16. Footwear article (2) with a sole construction (1) according to at least one of claims 1 to 15.

17. Shoe (2), in particular sports shoe, city shoe or hiking shoe, with a sole (1) and an upper (14), characterized by the fact that the sole (1) is a sole construction according to at least one of claims 1 to 15.

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