WO2020163930A1

WO2020163930A1 - Arrangement applied to an insole for footwear

Info

Publication number: WO2020163930A1
Application number: PCT/BR2020/050002
Authority: WO
Inventors: Marcelo SPERB; Fausto KAUER; Douglas SANTANNA DE MELLO; Marcus Rogério FARIAS BORTOLOTTI; Moacyr DA ROCHA RODRIGUES
Original assignee: Wirklich Industria De Plásticos Ltda.
Priority date: 2019-02-13
Filing date: 2020-01-02
Publication date: 2020-08-20
Also published as: BR102019002995A8; BR102019002995B1; BR102019002995A2

Abstract

The invention pertains to the technological field of footwear, and relates to an arrangement in the structure of an insole (1) for footwear, with a view to providing comfort, along with improved distribution of loads concentrated under the footwear article. The invention relates to a structural arrangement in an insole (1) for footwear, especially high-heeled footwear, having an injected part (2), a reinforced bearing area (7) and orifices for application of the heel (5). Said structural reinforcement is achieved by means of reinforcing ribs (8), a central rib (6) and transverse ribs (9). It comprises a front part (3) that is constructed so as to facilitate the bonding to the injected part (2) and the assembly of the footwear. The injected part (2) can be manufactured by means of a plastic injection process, and produced essentially from a rigid polymeric material, preferably fibreglass polypropylene, while the front part (3) consists of a flexible polymeric material, preferably polypropylene.

Description

PROVISION APPLIED IN MOUNTING INSULATION FOR

FOOTWEAR

Technological sector of the invention

[01] In general, the present invention belongs to the footwear technological sector and refers, more specifically, to a new arrangement in the footwear insole structure. The insole has an injected part essentially with reinforced support area, reinforcement ribs, central rib, transversal ribs and a front part that is joined to the injected part.

Known state of the art

[02] According to the Sectoral Report of the Footwear Industry released in 2018 by the Brazilian Association of Footwear Industries (Abicalçados), in the world, according to data collected, 21, 4 billion pairs were produced in 2017, almost 4% more than in 2016. Analysts point out that growth was basically driven by domestic consumption in countries. In 2017, 19.6 billion pairs were consumed, 3% more than in the previous year. In Brazil, which produced 908.9 million pairs in the period, there was an increase of only 1%, in production, while consumption reached 805.5 million pairs, only 1.2% higher than in 2016. , when it had already plummeted by more than 2%.

[03] In this context, the diversity of footwear and their development in design and technology is notorious; especially high-heeled shoes that have great appreciation for providing affection for fashion and providing a brief modification in the phenotype, above all, of women. Since the Second World War, high-heeled shoes have come to be preferred several times by their users, in theory since 1990. Lower heels gained prominence during the late 1960s and early 1970s too, but higher heels they returned in the late 1980s and early 1990s. The shape of the heel of the shoes was also remodeled over the years, in the 1950s the stiletto heel was created, in 1970 the block heel predominated and in 1990, the conical heel.

[04] Currently, there are a variety of heels, with types of heels such as wedge, block, conical, Cuban, low, bell, prism, among others; the heels

REPLACEMENT SHEETS (RULE 26) high heels are typically worn with heights ranging from 1 ½ inch (4 cm) kitten heels to 4 inch (10 cm) or more silver half heels. Extreme high-heeled shoes, such as those over 5 inches (13 cm), are usually worn for aesthetic reasons only and are not considered practical. High heels are used for work and formal occasions normally, while there are more common styles to wear in other situations. High heels have seen significant controversy in the medical field lately, with podiatrists and orthopedists indicating that many patients have severe problems with their feet, heels, ankles, knees or spine; however, this does not mean that all women wearing high heels will experience such complications.

[05] Experts claim that heels of up to 5 cm, which equals 3 fingers, are relatively safe. Above that, the chances of pressure on the soles of the feet and other complications increase. Using the jump three times a week, for about 7 hours a day, is a big risk factor for future problems. However, the total lack of the jump can also be detrimental. A very common symptom that shoes are not suitable is the appearance of corns. In addition, the use of heels can increase lordosis, double the load that the knee receives and even triple the load that the hip receives. By placing a very heavy load in front of the feet, the joints begin to be crushed and spread apart. Therefore, the tight fingers begin to deviate outward, forming the bunion. The narrower the jump at the front, the worse to form the bunion. There is also the sneaker, a shoe that looks like sneakers but has a heel inside. They have a high platform, which generates imbalance in the lower limbs. This shoe makes the person put more weight on the legs, lose the sensitivity of the step and this facilitates the sprain.

[06] In order to offer greater support to footwear, especially women's high-heeled shoes, steel souls were developed that are placed in the midsoles of this type of footwear. The steel shoe core was created and patented by Salvatore Ferragamo in 1920, previously these pieces were made of wood and as they did not have the resistance of steel, they were of greater volume and made the shoes much heavier and, therefore, more uncomfortable. After its creation, the shoes started to better accommodate the curvature of the soles of the feet according to the height of the heels, allowing a wide proliferation of heels culminating in the last century in the creation of the Stiletto, by many credited to Roger Viviee, but which in fact would be a creation of the Italians Dal Cò and Albanese, who created a sandal for the night, with two tiny straps and a low heel under the arch of the foot.

[07] Steel souls for the footwear sector are fundamental structural pieces in high-heeled shoes, be they medium-low or high, in addition to the many platforms. They are produced by steel fillets as the name already refers, next to the mounting insole that has the purpose of supporting the arch of the foot, and the necessary balance for the user of these shoes, where it extends from the sole of the foot to the heel , being fixed to the heel by screws or nails. The steel core is usually surrounded by a resistant cellulose called a plantex, located between the mounting insole and the reinforcement of the insole, there are cases where the steel core is wrapped not in cellulose, but in PVC or ABS (or similar) , which can be injected on the steel core or mounted on it as in the traditional cellulose insole.

[08] These steel souls generally vary between 0.8 mm to 1.5 mm thick, as heels or platforms gain height, steel souls gain thickness and length. As for the width, the variations can be even greater, between 0.5 cm and 2 cm, of course, within a normal range, the wider and thicker, the greater the stability and balance, but this will directly influence the weight of the shoes, which can make it uncomfortable due to this, so a good sense must be sought between support / balance and the final weight of the shoe, in order to make it as comfortable as possible.

[09] In relation to the materials currently used, it is known to use carbon fiber, which in addition to being more resistant than steel, is much lighter and would allow a gain of comfort in the final product, but the replacement of the core of leverage by the carbon fiber core comes up against the cost / benefit issue, which for many footwear industries the benefit does not outweigh the costs, since the use of carbon fiber results in a higher cost raw material. There is also the question of the suitability of the (metallurgical) industries that produce steel souls that, in order to start producing carbon fiber souls, would have to restructure their industrial parks.

[010] Still on the technical issue of shoe modeling, there should be a greater concern with the adequacy of the length of the steel core in the numbering of the shoes since the length of the steel souls within a line or model is the same whether for the number 33 is for the number 40. Considering that the difference in size between a 33 foot and a 40 foot is more than 4.6 cm, this differentiation between the numbers should be taken into account, since this differentiation exists , for example, for jumping. Perhaps due to this lack of adequacy is that we notice footwear numbering 33 and 34, with the sole of the foot floating and in larger numbers like 38, 39 and 40, with the toe so high at the base.

[01 1] In this context, research and new, more resistant and lightweight materials were used that would allow the application of new formats, for a better stability to the shoes. Considering that in theory it has not been successful in the development of great innovations in steel souls since they were created at the beginning of the last century by Ferragamo, fashion needed to adapt to the sector and not the fashion sector. In the latest international collections, quite different models can be seen, but in terms of structures, these models were responsible for the recent evolution in the sector of steel souls, these models, losing their traditional leaps, forced the creation of specific souls that this time do not have. one more of its fixations on the heel tray absorbing the weight that was previously attributed to the heels; moreover, there was a need to be wider, thicker and more rigid, all in conjunction with a platform, or a wider solar plant, which starts to absorb the pressure exerted by the jump, in order to provide support and necessary stability when walking. [012] That said, it is possible to list several technologies related to having a more improved midsole for high-heeled shoes. In this context, it is important to mention the solution presented in patent document n ^Q CN 200941859 - “Middle Sole Of High Heel Shoes”. The technology described in the document in question comprises a high-heeled shoe sole comprised of a plate, a fixing device and a reinforcement piece; where this fixture is embedded in the plate space and the reinforcement piece is joined to the fixture. For that, it is noted that the solution aims to obtain a safer structure as to the user's torsions and flexions, as well as other efforts; however, this is achieved by means of a joined fixing device and reinforcement piece; however, it does not take advantage of rigidly calculated ribs to obtain comfort and safety, moreover, by means of a single injected part as of the present application of invention.

[013] Even so, in patent document No. KR 201 10072936 - “Middle layer of a shoe sole and woman's footwear”, there is a midsole for high-heeled shoes in order to avoid deformation and improve the distribution of efforts in the structure. This patent document, more strictly, refers to the material that is used at the base of the shoe, similar to that of the present product “[...] and a main body in which a groove is formed so that the arch and heel of foot can be settled and the rear part thereof is made of one among glass fiber, fiber reinforced plastics, and polypropylene ''. However, although the patent document below uses materials similar to the present application, it does not provide for the rib technology developed and demonstrated by means of structural calculations, nor is it injected into one piece.

[014] At this juncture, there is a gap for development in the footwear sector, especially for high-heeled shoes, which have a quality physical and functional design, in addition to design and comfort, with considerable security. Therefore, it is understood that there is a gap in the existence of shoe midsoles that do not require the use of a steel core. That is, there is currently no knowledge of a support element for shoe insoles that offer a new arrangement with internal ribs joined to a central rib, together with support areas (7); this ensures well-being for users, as well as in the long term, reduction in possible health complications due to the continued use of these shoes.

News and objectives of the invention

[015] In order to provide a new solution to the footwear sector and to a large extent, to the female public, the present invention proposes a new arrangement applied to footwear insoles with a set of ribs and having a thickness variability that form reinforced areas for the production of this piece. Inspired by nature, we sought the best ways to propose the product, such as the bone structure of our body and the shape of the whales' tail, natural designs that present exceptional resistance, together with weight reduction.

[016] In this sense, the proposed invention in a functional and modern way provides users with comfort and safety through an innovative arrangement. Therefore, from the use of this element in the manufacture of footwear, especially high-heeled shoes, the benefit is evident in terms of twists and other unexpected efforts, and also, over time, health complications with regard mainly to members lower parts of the human body.

[017] The present invention proposes a versatile alternative for the production of midsoles, using raw materials such as polypropylene and fiberglass ranging from 40 to 60%, but more specifically 50%; however, there may be the application of other materials, but the prices for the acquisition of these may be higher. These raw materials together, provide the piece with high resistance to traction, flexion and impact, allowing ample flexibility, with the molding of complex pieces, large or small, without seams and with great functional and aesthetic value. Therefore, the injection process that is commonly known and used in the footwear sector for the manufacture of parts plastic, proposes flexibility, productivity, dimensional and surface quality for the sole parts.

[018] For the use of the product now proposed, an insole for footwear, especially high-heeled shoes, was developed with ribs precisely distributed over the surface of the injected part, together with support and reinforcement areas with variability in thicknesses . For this, ribs are spread over the bottom surface of the insole, with reinforcement ribs, transversal ribs, a central rib together in the piece, of rigidly calculated thicknesses, to provide structure, flexibility and security in what concerns the element. refers to obtaining resistance to normal and abnormal efforts.

[019] With this in mind, the technical benefit generated by the implementation of a shoe insole, which facilitates the distribution of concentrated loads of the user's weight, as well as providing comfort and safety in daily use, is evident. It is evident that the solution proposed in the present patent application provides benefits for the footwear market.

[020] Furthermore, from the implementation of the assembly insole, the object of the present invention, the footwear production process benefits from a circular economy of recycling and reverse logistics by having materials that can be recycled, and in addition, leads a reduction in production steps. For consumers, on the other hand, it provides, by means of just one piece, considerable advantages in relation to the reduction of the weight of the shoes and, consequently, the effort required for their use, directly impacting the comfort of the shoes. Still, the solution proposed in the present patent application avoids discomfort generated by the steel souls in metal detectors, such as in airports, creating discomfort for users when they pass through the scanner and are forced to remove their shoes, since the metal souls activate the alarms. However, the mounting insole also admits that shoes can be wet, facilitating cleaning and drying more quickly, since the front of the insoles is currently produced in cardboard.

Description of the attached drawings

[021] In order for the present invention to be fully understood and carried out by any technician in this technological sector, it will be described clearly, concisely and sufficiently, based on the attached drawings, which illustrate and subsidize the ones listed below :

Figure 1 represents the shoe mounting insole in perspective.

Figure 2 represents the injected part in perspective.

Figure 3 represents the injected part in perspective in the posterior view.

Figure 4 represents the injected piece in perspective, with a thickness of 5.5 mm, reinforced support area, reinforcement ribs, central rib of 6.5 mm and adjacent ribs of 6 mm.

Figure 5 represents the front of the insole, highlighting the parallel lines, holes on the surface, fixation cavities and the edge for joining the injected part.

Figure 6 represents the front part of the insole highlighting the smooth surface, holes on the surface, fixation cavities and the edge for joining the injected part.

Figure 7 represents the injected part in perspective with emphasis on the simulation under 5.5 mm thickness.

Figure 8 represents the injected part in perspective with emphasis on the simulation under a thickness of 6.5 mm.

Figure 9 represents the injected part in perspective with emphasis on the simulation under 5.5 mm thickness with reinforced support area.

Figure 10 represents the injected part in perspective with emphasis on the simulation under 5.5 mm thickness with reinforced support area and reinforcement ribs with existing ribs. Figure 11 represents the injected part in perspective with emphasis on the simulation under 5.5 mm thickness with reinforced support area and reinforcement ribs with existing ribs and central rib with 6.5 mm.

Figure 12 represents the injected part in perspective with emphasis on the thickness of 5.5 mm with reinforced support area, reinforcement ribs and transversal ribs distributed by the piece.

Figure 13 represents the injected part in perspective with emphasis on the simulation under thickness of 6.5 mm with transverse ribs distributed over the part.

Figure 14 represents the part injected in perspective in structural simulation under free twist in the heel and the front part of the sole is fixed.

Figure 15 represents the part injected in perspective in structural simulation under free twist in the heel and the front part of the sole is fixed.

Figure 16 represents the part injected in perspective in a structural simulation, where the heel and the front part of the sole under twist are fixed.

Figure 17 represents the injected part in perspective in a structural simulation, where the heel and the front part of the sole under twist are fixed.

Detailed description of the invention

[022] In order to obtain the benefits with the practicality and comfort and / or similar practices previously mentioned, the present invention patent has an arrangement consisting of an insole (1), which allows the distribution of concentrated efforts on the surface in contact with the user's feet. In addition, it is emphasized that this arrangement aims to allow greater comfort and less load on the user's knees and spine. In particular, the present invention aims to benefit users of high-heeled shoes in their daily lives, combining protection and well-being, through a constructive insole, with reduced number of elements and that reduces the weight of the shoes.

[023] The mounting insole (1) consists of two components: the injected part (2) that points to the shape of the shoe base and the front part (3) that is the shape of the shoe tip, as shown in Figure 1 . In this context, for the present invention to achieve the desired objectives, the injected part (2) is made and the from a mixture of polymeric material and fiberglass. More specifically, the injected part (2) is produced from polypropylene and around 40 to 60% glass fiber, but preferably 50%. The front part (3) is produced by means of insertion processes in the mold for subsequent injection next to the injected part (2), and is produced from a flexible polymer with polypropylene and additives that offer greater flexibility to the final footwear.

[024] The injected part (2) as shown in Figures 2, 3 and 4, has a smooth surface that comes in contact with the sole and the insole, which will be arranged under the contact side with the soles of the feet. In this case, the injected part

(2) it also has at least 1 to 5 through holes (5) for fixing the heel in the shoe assembly. However, on the face opposite to the smooth surface, the structure of the piece (2) has distributed visibly (1 1), a reinforced support area (7), reinforcement ribs (8), at least one central rib (6) and transverse ribs (9).

[025] The front part (3), as shown in Figures 5 and 6, is made of flexible polymer, preferably polypropylene, and can have different designs, triangular, semicircular, rectangular, among others. It has a smooth surface (15) and an opposite surface (bottom) with grooves (13) on the entire face. There are also holes (12) around the front (3) located at the edges that vary with spacing from 3 to 15 mm, which together with the grooves (13) provide better bonding to the part (2) in the process of union that is performed through the edge (14), which provide greater flexibility on the tip of the feet when walking. However, it should be noted that there are no advantages to using a specific side, only such a configuration improves the joining of parts (2) and

(3). There are also at least two through holes (4) with spacing that varies from 10 to 100 mm in the region of the sole of the feet for fixing in the assembly of the high-heeled shoe, where this has better fixation of this part in the tool injection to hold and not move the part during over-injection of the other material. [026] By means of Figure 3, the posterior surface of the injected part (2) without the reinforcement area (7), the reinforcement ribs (8), central rib (6) and the transversal ribs are observed evenly distributed (9). These elements, together, form the constructive disposition of the injected part (2), where through structural studies of computational analysis the viability and definition of the part's shape are obtained (2).

[027] In order to obtain the ideal model, a series of structural simulations were carried out with respect to the injected part (2), which will house the ribs (6) (8) (9) (1 1) in its variations and applications, as well as support and reinforcement areas (7). Therefore, we tried to perform simulations with each model, varying its thickness according to the addition of the ribs (6) (8) (9) in the injected part (2) being applied. To begin with, the parameters chosen for the simulations were density: 1.35 g / cm ³ ; modulus of elasticity: 13,150 M Pa and tensile strength: 120 MPa. In this sense, at first, as shown in Figure 7, the injected part (2) with a thickness (17) of 5.5 mm was projected; similarly, as in Figure 8, the injected part (2), now with a thickness of 6.5 mm, was projected. In this way, a reinforced support area (7) was applied to the injected part (2) with a thickness (17) of 5.5 mm, as can be seen in Figure 9. Then, to this new form mentioned, as shown as shown in Figure 10, reinforcement ribs (8) were applied distributed in parallel and interconnected with the distributed ribs (1 1) already contained in the initial model of the injected part (2) according to Figures 2 and 3. Thus, it was also applied to this model described, as exemplified in Figure 11, a central rib (6) of 6.5 mm. Improving this model, transverse ribs (9) were placed throughout the injected part (2), as shown in Figure 12. Finally, in the last model, in Figure 13, there is an increase (18) the injected part ( 2) 6.5 mm thick, maintaining the transverse ribs (9).

[028] In this sense, a table of results was obtained comparing the volume and weight of each model, as shown below in Table 1: Table 1 - Volume x Weight

[029] Taking into account each model previously described, efforts have been made that eventually occur with the use of this type of footwear, thus, it is possible to analyze their behavior in different situations. The first situation is with free twist in the front of the injected part (2) and rotation in the region applied to the jump, as shown in Figures 14 and 15. The second situation applies when the region of the jump is fixed and rotation in the part frontal part of the injected part (2), more precisely on the soles of the feet, as shown in Figures 16 and 17. Such situations, although they may occur sporadically, if they occur, can cause injuries and greater damage to users. Thus, it is necessary to predict which model of the injected part (2) would be the most appropriate for these situations, and thus, in Table 2, we have the results of situation 1.

Table 2 - Fixed frontal region and rotation in the jump.

[030] In Table 3, we have the results related to the rotation tests in the frontal region and the jump.

Table 3 - Rotation in the frontal region and fixed jump.

[031] In this context, also for each model, efforts were simulated due to a load of 90 kg on an injected part (2) where the following results were obtained:

Table 4 - Efforts due to a load of 90 kg on a shoe.

[032] Through structural simulations, in any constructive modeling of interest, it is possible to analyze the best characteristics for a final model. Thus, when evaluating the results obtained, it is possible to define the ideal model of the injected part (2) which is similar to that shown in Figure 4, and has a thickness (16) that varies from 4.5 to 6.5 mm with ribs punctually distributed, reinforced support area (7) on the surface, which can vary from 4 to 6 mm. In this model, the reinforcement ribs (8) which can vary from 4.5 to 6.5 mm, but more specifically have 6 mm, a central rib (6) which can vary from 4.5 to 6.5 mm, but more specifically, it has 6.5 mm, transverse ribs (9) from 4.5 to 6.5 mm, and between the transverse ribs (9), there is a material thickness on the surface of the injected part (2) (10) ) which can vary from 2.5 to 4 mm.

[033] At this juncture, we tried to manufacture the model of the insole (1) with such characteristics described in this report and test it on high-heeled shoe prototypes, in this way it was possible to define that the height that such insoles can be applied vary from 40 to 100 mm, heel measurements to the contact surface of the soles of the feet.

[034] It is important to point out that the figures and description made do not have the ability to limit the forms of execution of the inventive concept now proposed, but rather to illustrate and make understandable the conceptual innovations revealed in this solution. Thus, the descriptions and images must be interpreted in an illustrative and non-limiting way, and there may be other equivalent or analogous ways of implementing the inventive concept now revealed and that do not escape the protection spectrum outlined in the proposed solution.

[035] This specification describes a provision applied to the footwear insole, with novelty, inventive step, descriptive sufficiency, industrial application and, consequently, covered with all the essential requirements for granting the privilege claimed.

Claims

1 - SHOE ASSEMBLY INSOLE comprising an injected part and a front part characterized by the injected part (2) being made of rigid polymeric material; where the injected part (2) has a lower surface with distributed ribs (11), reinforced support area (7), reinforcement ribs (8), at least one central rib (6) and transverse ribs (9).

2 - SHOE ASSEMBLY INSOLE, according to claim 1, characterized in that said injected part (2) is joined to at least one front part (3) made of flexible polymeric material.

3 - SHOE ASSEMBLY INSOLE, according to claim 1, characterized in that said injected part (2) is produced from polypropylene and fiberglass.

4 - SHOE ASSEMBLY INSOLE, according to claim 1, characterized by said injected part (2) presenting smooth contact surface with the soles of the feet.

5 - SHOE ASSEMBLY INSOLE, according to claim 1, characterized in that said front part (3) is made of polypropylene and comprises a smooth surface (15) and the opposite surface with grooves (13).

6 - SHOE ASSEMBLY INSOLE, according to claims 2 to 5, characterized in that said front part (3) has holes (12) around the front part (3) located at the ends and at least two through holes (4) and edge (14).

7 - SHOE ASSEMBLY INSOLE, according to claims 1 to 5, characterized in that the injected part (2) is produced from polypropylene with 40% to 60% glass fiber. 8 - SHOE ASSEMBLY INSOLE, according to claim 1, characterized in that the front part (3) is produced by means of an injection process in the mold.

9 - SHOE ASSEMBLY INSOLE, according to claim 1 and further characterized by the injected part (2) still having at least 1 to 5 through holes (5).

10 - SHOE ASSEMBLY INSOLE, according to claim 1, characterized in that the injected part (2) has a thickness (16) that varies from 4.5 to 6.5 mm with punctually distributed ribs, reinforced support area (7 ) on the surface, which can vary from 4 to 6 mm, reinforcement ribs (8) which can vary from 4.5 to 6.5 mm, to at least one central rib (6), which can vary from 4.5 to 6.5 mm, the transverse ribs (9) varying from 4.5 to 6.5 mm, and between the transverse ribs (9), the thickness of the material (10) varies from 2 on the surface of the injected part (2) , 5 to 4 mm.

11 - SHOE ASSEMBLY INSOLE, according to claim 10, characterized by the thickness of the reinforcement ribs (8) being 6 mm and the at least one central rib (6) being 6.5 mm.

12 - SHOE ASSEMBLY INSOLE, according to claim 2, characterized by the front part (3), which can be produced in different designs, such as triangular, semicircular, rectangular, adapted according to the shoe model.

13 - SHOE ASSEMBLY INSOLE according to claim 6 characterized in that the front part (3) is joined by the edge (14) to the injected part (2) by means of over-injection processes in the mold or glue.

14 - SHOE ASSEMBLY INSOLE, according to claims 6 to 12, characterized in that said grooves (13) and holes (12) of the front part (3) are for adhesion and distribution of the polymer on the injected part (2) or the glue joining elements. 15 - SHOE ASSEMBLY INSOLE, according to claim 1, characterized by the mounting insole being applied to high-heeled shoes whose heel height varies from 40 to 100 mm.