Method for producing a shoe with a insole-side insert

Abstract

Method for manufacturing a shoe (5) with a sole chassis (1) comprising at least an insole (6) which is covered downwards by an outsole (10), wherein in a first method step the upper (2) drawn around a last (18) is connected to the insole (6) with its edge-side last (3), wherein in a second method step a leaf-shaped and flexible insert (8) is inserted through recesses (9) in the insole (6) into a receiving space (7) formed between the bottom side of the last (18) and the top of the insole (6), and wherein in a third method step the outsole (10) is attached to the bottom side of the insole (6).

Description

[0001] The invention relates to a method for producing a shoe with an insole-side insert.

[0002] The subject matter also includes a method for producing a shoe in which the insole-side insert consists of a spring-elastic structural sole.

[0003] The invention also relates to a shoe produced according to the method, as well as to a shoe ventilated via the spring-elastic structural sole.

[0004] A method for producing a shoe according to the preamble of patent claim 1 has become known, for example, from EP 3 654 795 B1, which goes back to the same applicant.

[0005] A special feature of this publication is the structure of the insole. The central feature of a shoe construction is the insole, i.e. the insole, which is the part of the base on which the foot stands in the finished shoe, unless an additional cover or insole is placed over it. The rest of the shoe is grouped around the insole as the load-bearing element, with the insole being attached to the upper at the top edge and to the outsole at the bottom. The shoe is assembled on the shaping last. The upper is pulled (lasted) or strobeled (sewn) over this last, to which the insole is attached. The upper and shoe sole are then joined together. The upper edge (lasted) lies under the insole edge. The connection can be made in a variety of ways (so-called "machart"). In industrial production today, gluing (glue-lasted) and strobeling (sewn) are common.More expensive shoes are also sewn (flexibly sewn, through-stitched, or welted). For glued shoes, the insole and the upper edge are first temporarily joined together, then the outsole is coated with heat-activated adhesive and glued under the insole.

[0006] For molded-on soles (e.g., in sports shoes), the upper, which is glued or strobeled (attached with a zigzag seam) to the insole, is first placed in a mold so that the sole can be molded from below and, upon cooling, bonds to the insole and the lower edge of the upper. The outsole acquires its profile through the mold in which it cools.

[0007] In the manufacture of shoes according to the company's own EP 3 654 795 B1, it has been found that production can be improved and simplified. For the integration of the spring-elastic structural sole described therein, it was necessary to remove the structural sole from the automated production process and, in a special process comprising several steps, to combine it with an upper and lower nonwoven covering layer, which formed a circumferential edge. Such a circumferential edge is, for example, Figure 1 This can be seen in the aforementioned publication with reference number 10. Only by coating the spring-elastic structural sole with the additional layer referred to therein as a pressure plate was it possible to integrate the spring-elastic sole into the composite of the insole and to connect it to the insole at the edges. However, this involved increased manufacturing effort and additional costs.

[0008] In the subject matter of the previously known EP 3 654 795 B1, it has been found that the desired ventilation effect can be achieved by simpler means.

[0009] In addition, it was recognized that the simplified manufacturing process does not only refer to the possibility of connecting structured, metallic structural soles to the insole in a simple manner, but that this possibility applies to all possible and conceivable insoles of any kind, where the aim is to connect the insole to the insole as quickly and cheaply as possible during production in order to ensure that the insole protrudes into the interior of the shoe after the shoe structure has been completed and there unfolds its special properties.

[0010] Therefore, the invention extends to all possible sheet-shaped and flexible inserts, which preferably have special properties, such as special flexibility, special ventilation, special hygienic properties or mechanically stabilizing properties.

[0011] The invention is therefore based on the object of developing a method for producing a shoe known from EP 3 654 795 B1 in such a way that a sheet-shaped, flexible insert, in particular a spring-elastic structural sole, can be integrated into the sole chassis of the shoe more easily and cost-effectively.

[0012] A further task is to realize the well-known ventilation effect of a spring-elastic structural sole using simpler means.

[0013] To achieve the stated object, the invention is characterized by the technical teaching of claim 1.

[0014] An advantageous feature of the invention is that it is no longer necessary to provide the flexible, sheet-shaped insert, particularly in its design as a spring-elastic structural sole, with an additional fleece-like covering layer to form a sewable edge layer, but instead the insert, particularly the spring-elastic structural sole, can be integrated "naked", i.e. unprocessed and not impaired by any further additional measures, directly into the insole during the production process of shoe manufacturing.

[0015] According to the preferred technical teaching of independent claim 1, this is achieved in that the sheet-shaped, flexible insert is inserted from below through recesses in the insole into a receiving space formed between the bottom side of the last and the top side of the insole, whereby it is thus directly encompassed by the insole without further fastening means - preferably in a form-fitting manner.

[0016] The size of the recesses should preferably be such that a flexible, sheet-shaped insert, the size of which approximately corresponds to the wearer's foot contour, can be passed through at least one recess of the insole without great difficulty. The combination of such an insert with the insole imparts new properties to the shoe structure, such as mechanical reinforcement and / or hygienic and / or physical properties, which are achieved through the type and composition of the insert.

[0017] The "naked"—that is, the non-covered—design of an insole, especially a spring-elastic structural sole whose upper surface extends directly into the shoe interior, has the advantage that the insole material extends into the shoe interior and directly faces the wearer's sole. It can either rest directly against the wearer's sole with its surface or be covered with a textile cover or an insole.

[0018] The leaf-shaped and flexible insole can therefore be impregnated with fragrant and / or sweat-absorbing substances and / or with perspiration-suppressing substances. It can have mechanically stabilizing properties, such as the spring-elastic structural sole mentioned here, and / or it can create a ventilation effect on the sole of the wearer's foot.

[0019] The insole advantageously features appropriately dimensioned recesses, allowing the insert to be inserted into the space formed between the bottom of the last and the top of the insole. This allows the insert, preferably the spring-elastic structural sole, to be positioned correctly in the sole chassis without any further measures, without requiring any edge attachment to the upper or insole.

[0020] In order to insert the elastically bendable insert, preferably the spring-elastic structural sole, through the recesses in the insole from below into the aforementioned gap between the insole and the bottom of the last, a further development of the invention can involve elastically bending or deforming the insert to allow insertion through the recesses in the insole. Due to its spring elasticity, it can be bent and, in this bent state, guided through the recesses in the insole, whereby it then springs back to its original position at the point of its final destination and remains in the desired final position.

[0021] The upper is pulled onto the insole (with cutouts) and sewn or lasted. The stabilizing insert is then pushed through the cutouts in the insole.

[0022] It is advantageous if the insole is already connected to the shaft at the edges using one of the methods mentioned above, so that a stable space is created between the bottom of the last and the top of the insole for inserting the flexible insert.

[0023] Since the insole also has a certain degree of flexural elasticity, this ensures that the insole, the leaf-shaped insert on its upper side, presses against the underside of the last and thus fixes it in place.

[0024] In a subsequent step, a final bond may be created between the insole and the insert, which forms a form-fitting fit on the upper surface. A first option is to coat the insole from the underside with an adhesive, which penetrates the recesses in the insole to the underside of the insert, bonding it to the insole with an adhesive bond.

[0025] Another embodiment may provide for the outsole to be molded onto the insole in an injection mold or a foam mold, whereby the liquid plastic material also passes through the recesses of the insole and reaches the underside of the insert in order to firmly and immovably connect the insert to the insole.

[0026] The advantage of all the measures described is that it is now possible for the first time to have the insole extend directly into the interior of the shoe without any additional covering layer, so that the observer can see the "bare" insole when looking into the shoe's interior. If the insole is designed as a structured sole, the characteristic diagonal ribs extend into the interior and then rest indirectly (via suitable coverings) or directly on the sole of the wearer's foot. In the latter case, it is sufficient to insert an insole into the interior of the shoe on top of the ribbed structured sole.

[0027] The advantage of the inventive measures according to independent claim 1 and the subclaims following it is that the integration of a band-sole-side insert, preferably a spring-elastic structural sole, can be automated during shoe production. This means that it is no longer necessary to connect the structural sole to additional cover layers and to connect it to the upper at the edges. Rather, in automated shoe production—as described—the insert is pushed through recesses in the insole into the space between the underside of the last and the top side of the insole and remains there until the end of the production process. This makes shoe production faster, more cost-effective, and higher quantities can be produced per unit of time.

[0028] A shoe with the aforementioned features is the subject of independent claim 7. This results in a special shape and design of an insole according to the invention, in which it is particularly advantageous if the insole has suitably large recesses for the insertion of an insert, preferably a resiliently flexible structural sole, which requires a special shape of the insole. The insole can be made of a sheet-like, thin nonwoven material, leather, plastic, or composite materials.

[0029] A plurality of relatively large recesses can be arranged at a mutual distance from one another in the insole, so that the recesses in the insole arranged at a mutual distance from one another can preferably occupy a surface area of ​​60-80% of the total surface area of ​​the insole.

[0030] The arrangement of the relatively large cutouts also results in a good ventilation effect for the interior of the shoe, as described below. Thus, there is a direct connection between the cutouts in the insole and the possibility of inserting the insole through these cutouts to the bottom of the last upon elastic deformation. The aforementioned cutouts therefore have the overall connection to the technical teaching of independent claim 8, namely that the size of the cutouts creates a superior ventilation effect in the interior of the shoe.

[0031] The type and composition of a ventilated structural sole is known, for example, from EP 3 654 795 B1. The mechanical properties of a spring-elastic structural sole and the associated advantages can be found, for example, in DE 100 15 240 A1.

[0032] With the technical teaching of independent claim 8, in contrast to the prior art according to EP 3 654 796 B1, the ventilation effect is now shifted into the insole, which was not previously known.

[0033] In the aforementioned EP 3 654 795 B1, the ventilation effect relies on the provision of a separate pressure plate, designated by reference numerals 10 and 20, which required an additional insole 23. According to the technical teaching of independent claim 8, the ventilation effect is now achieved by eliminating the previously required pressure plate 10, 20 and by the insole itself having a longitudinally wave-shaped groove structure that is complementary—namely, complementary—to the groove structure of the structural sole.

[0034] There are two different embodiments of the term "complementary, namely complementary to one another." In a first embodiment, the wave shape of the groove structure of the structural sole counter-directional to the wave shape of the insole.

[0035] Such a counter-rotating shape can be seen, for example, in Figure 17a of EP 3 654 795 B1. In a different embodiment, it can be provided that the wave shape of the groove structure of the structural sole parallel to the wave shape of the insole, which is, for example, Figure 4 can be found in the cited document. Both embodiments are claimed as inventive in conjunction with a novel insole.

[0036] Particularly when the groove structure of the insole is arranged in a counter-directional manner to the groove structure of the structured sole, a good ventilation effect is achieved because large ventilation spaces are formed between the two complementary rib structures, resulting in a good ventilation effect directly beneath the sole of the user's foot. The ventilation channels of the insole can be relatively large and are directed directly against the underside of the user's foot, creating a noticeable ventilation effect on the sole of the foot when walking.

[0037] The subject matter of the present invention results not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another.

[0038] All information and features disclosed in the documents, including the abstract, in particular the spatial configuration depicted in the drawings, could be claimed as essential to the invention, insofar as they are novel, individually or in combination, compared to the prior art. The use of the terms "essential" or "according to the invention" or "essential to the invention" is subjective and does not imply that the features so named must necessarily be part of one or more patent claims.

[0039] The invention is explained in more detail below with reference to drawings illustrating only one embodiment. Further essential features and advantages of the invention will become apparent from the drawings and their description.

[0040] They show: Figure 1 : Schematic cross-section through a preferred embodiment of a sole chassis in exploded view. Figure 2 : Schematizes the process step for introducing a structural sole through recesses in the insole. Figure 3 : Schematizes a longitudinal section through the sole chassis in an exploded and not to scale representation in a first embodiment. Figure 4 : One opposite Figure 3 modified, second embodiment.

[0041] With regard to the drawing figures, it should be noted that the illustrations are roughly schematic and have been produced in exploded view in order to explain the principle of the invention. In reality, the insole is positioned directly below the lasting fold of the upper, and the insert, preferably a structured sole, inserted into the space between the underside of the last and the upper side of the insole, fits snugly against the underside of the last and is essentially flush with the lasting fold. For the sake of simplicity, the above-mentioned parts have been shown in the Figures 1 - 4drawn in an exploded view and disregarding the actual dimensions. For example, the thickness of the insole 12 is shown as relatively thin. However, the insole 12 can have a considerable thickness in the range between 5 mm and 50 mm, which is not shown for reasons of graphic simplicity.

[0042] The shoe 5 in Figure 1 It essentially consists of a partially illustrated upper 2, whose lasting fold 3 is connected to the edge of an insole 6 by a stitching 4 shown as an example. This forms the sole chassis 1.

[0043] An insole 12 can be arranged in the interior of the shaft 2, which in this embodiment is plate-shaped.

[0044] The insole 6 can be made of a nonwoven material or a leather material or another flat, sheet-shaped material and has a number of recesses 9 which break through the material of the insole 6 and only webs 16 remain between the recesses 9.

[0045] The insole 6 can be connected to an outsole 10 at the edges using measures not shown in detail. The various connection options were specified in the general description.

[0046] In order to simplify shoe production, the technical teaching of claim 1 states that - with a last 18 still arranged in the upper 2 in a form-filling manner - it is provided that an insert 8, preferably a spring-elastic structural sole 8a, as described in the above-mentioned documents, is pushed through one of the recesses 9 by spring-elastic bending in the direction of arrow 20 and is inserted in the direction of arrow 21 in a receiving space 7 which is formed between the bottom side 19 of the last 18 and the top side of the insole 6.

[0047] This allows for particularly simple fastening and integration of the insert 8, preferably the structural sole 8a, in the receiving space 7, without the need for separate fixing by means of sewing or other mechanical means, which were still necessary in EP 3 654 795 B1.

[0048] Once the insert 8, preferably the structural sole 8a, has filled the receiving space 7, the further process steps can be carried out, namely, for example, in a further process step, either the underside of the insole 6 is coated with an adhesive and an elastic outsole 10 is glued thereto. The advantage here is that by applying the adhesive, the adhesive also penetrates the recesses 9 to the underside of the insert 8, preferably the structural sole 8a, and thus secures it in the receiving space 7.

[0049] However, in another embodiment, it can be provided that the adhesive between the outsole 10 and the underside of the insole 6 is applied so sparingly that it does not reach the underside of the insert 8, preferably the structural sole 8a.

[0050] In a different manufacturing step, it can be provided that the outsole 10 is molded onto the underside of the insole 6 in an injection molding or foaming process, whereby the hardening material of the outsole 10 simultaneously firmly connects the insert 8, preferably the structural sole 8a, to the insole 6.

[0051] In the Figures 1 and 2 The special manufacturing simplification was generally presented, which results from the insert 8, preferably the structured sole 8a, being inserted through a recess 9 in the insole 6 into the receiving space 7, which is created between the bottom side 19 of the last 8 and the top side of the insole 6. This provides the advantage for the first time that the insole protrudes "naked" into the shoe interior and can only be covered from above by a suitable insole 12.

[0052] It should be noted that this particular manufacturing simplification does not necessarily depend on the ventilation effect of the structural sole 8 in conjunction with an insole 12. The manufacturing simplification according to independent claim 1 and the subclaims following it can therefore also be applied to unperforated and / or non-ventilated insoles 8 and, in particular, also to structural soles 8a which correspond only to DE 100 15 240 A1 with their wave or rib structure, but are integrated into the receiving space 7 in the sole chassis 1 in the inventive manner described here.

[0053] In a further development of the invention, it can be provided that by the special fixation or integration of the structural sole 8a in the receiving space 7, an improved ventilation effect can be achieved which goes beyond the ventilation effect according to the own EP 3 654 795 B1.

[0054] To illustrate the ventilation effect, Figure 1 In addition, it is provided that ventilation holes 25 are arranged in the structural sole 8a, which advantageously have an airtight connection with associated ventilation channels 17 of an insole 12 resting on the rib structure of the structural sole 8. The ventilation effect is already achieved when the insole 12 is Figure 1 is plate-shaped and has only suitable ventilation channels 17.

[0055] To increase the ventilation effect, an insole 12 after Figure 3 which has a rib structure complementary to the rib structure of the structural sole 8a. In Figure 3It is provided that the wave 23 forming on the bottom side of the insole 12 is opposite to the directly opposite lower wave 24 of the structural sole 8a, so that large-volume compression spaces 27, 28 are created between the mutually associated and mutually complementary parts 8a, 12.

[0056] When pressure is exerted on the ribbed structure of the insole 12 with the sole of the foot, the waves 23 deform downward into the corresponding valleys of the wave structure 24 of the structural sole 8a, thus improving the ventilation effect, so that a compressed air stream 29 flows out of the ventilation channels 17 of the insole 12 toward the underside of the user's foot. In the same way, the air in the lower compression spaces 28 between the underside of the structural sole 8a and the upper side of the insole 6 is compressed and also flows as an air stream 29 from the ventilation channels 17 of the insole 12 directly toward the underside of the user's sole.

[0057] While in Figure 3 the opposing, complementary arrangement of shafts 23, 24 is shown in Figure 4As a further embodiment, a co-rotating wave 22 of a rib structure of the insole 12 is shown in comparison to the complementary wave 24 of the structural sole 8a. The same reference numerals apply to the same parts. The upper compression spaces 27 are then designed to be smaller in volume than the compression spaces 27 in Figure 3 .

[0058] In both versions of the Figures 3 and 4 Accordingly, the insole 12 has upper, obliquely running ribs 13 which are complementary to the rib structure of the structural sole 8 with its grooves 14. Drawing legend

[0059] 1Sole chassis 2Shaft 3Turn-back 4Sewing 5Shoe 6Insole 7Receiving space 8Insole 8aStructural sole 9Recess (in 6) 10Outsole 11 12Insole 13Top groove 14Bottom groove 15 16Bridges (of 6) 17Ventilation channel (in 12) 18Last 19Base side (of 18) 20Arrow direction 21Arrow direction 22Corrugation (same direction) of 12 23Corrugation (opposite direction) of 1 24Corrugation (of 8) 25Ventilation hole (in 8) 26 27Compression space (top) 28Compression space (bottom) 29Air flow

Claims

1. A method for producing a shoe (5) with a sole chassis (1) which consists of at least one insole (6) which is covered at the bottom by an outsole (10), wherein in a first method step the upper (2) pulled around a last (18) is connected to the insole (6) by its edge-side lasting fold (3), characterized in that in a second method step, a sheet-shaped and flexible insert (8) is inserted through recesses (9) in the insole (6) into a receiving space (7) which is formed between the bottom side of the last (18) and the top side of the insole (6), and in that in a third method step the outsole (10) is fastened to the bottom side of the insole (6).

2. Method according to claim 1, characterized in thatin the second process step, the insert (8, 8a) is guided through the recesses (9) of the insole (6) by means of elastic deformation and then rests on the underside of the last (18).

3. Method according to claim 1 or 2, characterized in that the strip (18) is removed either after the second or the third process step.

4. Method according to one of claims 1 to 3, characterized in that the connection between the shaft (2) and the insole (6) in the lasting fold (3) is made by sewing with a zigzag seam (strobel).

5. Method according to one of claims 1 to 4, characterized in that the connection between the shaft (2) and the insole (6) is glued (glued-lasted) in the lasting fold (3) or flexibly sewn, sewn through or welt-stitched.

6. Method according to one of claims 1 to 5, characterized in thatthe outsole (10) is attached to the insole (6) by gluing or that the outsole (10) is foamed or injected onto the insole (6).

7. Shoe (5) with a sole chassis (1) consisting of at least an insole (6) which is covered at the bottom by an outsole (10), characterized in that suitably sized recesses (9) for the introduction of a leaf-shaped, flexible insert (8, 8a) are arranged in the insole (6).

8. Ventilated shoe (5) with a sole chassis (1) consisting of at least one insole (6) which is covered at the bottom by an outsole (10) and on the upper side of which a spring-elastic structural sole (8) with a groove structure which is wavy in longitudinal section is arranged, wherein the upper (2) drawn around a last (18) is connected to the insole (6) by its edge-side lasting fold (3), and one or more ventilation holes (25) are arranged in the structural sole (8), which are connected in an airtight manner to associated ventilation channels (17) of an insole (12), characterized in that the insole (12) also has a longitudinally wave-shaped groove structure which is complementary, namely complementary to the groove structure of the structural sole (8).

9. Ventilated shoe (5) according to claim 8, characterized in thatthe wave shape (24) of the groove structure of the structural sole (8) is opposite to the wave shape (23) of the insole (12), Figure 3.

10. Ventilated shoe (5) according to claim 8, characterized in that the wave shape (24) of the groove structure of the structural sole (8) is parallel to the wave shape (22) of the insole (12), Figure 4.

11. Shoe (5) according to one of claims 7 to 10, characterized in that the outline of the flexible, leaf-shaped insert (8, 8a) corresponds to the foot outline of the wearer.

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