RU2160025C2 - Shoe insole with model insert - Google Patents

Abstract

FIELD: light industry. SUBSTANCE: shoe insole has insole base and model insert attached to base. Model insert has multilayer structure composed of plastic layer covered at both sides with layers of textile fibers. Insole of such structure has improved forming and strength properties. EFFECT: simplified structure and convenient usage. 8 cl, 3 dwg

Description

 The invention relates to shoe insoles, including the base of the insole and a model insert attached to it. In addition, the invention relates to model inserts.

 An essential part of the design of the shoe is the insole, which provides a given shape of the inside of the sole of the shoe. Such insoles traditionally consist of an upper base of the insole made of a special material based on cellulose and attached to its underside of a special model insert. The model insert contains an elastic element in the interface plane with the bottom surface of the insole base, which gives the insole sufficient rigidity and the correct shape. Usually, solid cardboard processed using a special technology is used to make a model insert, and the cardboard blank has a bevel towards the front, forming the necessary deflection together with the insole base.

 Despite the fact that the cardboard from which the model insert is made is inside the shoe, it is nevertheless subject to external adverse long-term effects. Cellulose contained in cardboard tends to absorb moisture, which leads to loss of strength of both the insert and the shoe as a whole. In some cases, there is even a loss of the elastic element, which is mechanically attached to the model insert. In addition, when fixing the nail caps in the heel of the model insert, it becomes necessary to install a separate metal strip between the base of the insole and the model insert. The ability to form with sufficient stiffness of thin cardboard blanks is also very problematic.

 The technical result of the present invention is to eliminate the above disadvantages by offering insoles with a model insert, devoid of the negative sides of the structures of the considered technical level.

 The specified technical result is achieved by manufacturing a shoe insole with a model insert forming the inner surface of the sole of the shoe and including a base of the insole and a model insert attached to the bottom surface of the insole, so that the model insert has a multilayer structure including a layer of plastic coated with both sides with layers of textile made from fiber.

 In addition, the textile layers are made of non-woven material.

 The fiber forming the textile layers is made of synthetic plastics.

 Heel nails are attached directly to the material of the model insert.

 The shape of the model insert, which determines the stiffness of the insole, is set by a layer of plastic.

 The model insert has a multilayer structure, including a layer of plastic coated on both sides with layers of textile made of fibers.

 Layers of textile insert model made of non-woven material.

 The fiber forming the textile layers of the model insert is made of synthetic plastics.

 The plastic layer in the middle of the model insert gives the insole stiffness and strength. The presence of layers of textile on both surfaces of the model insert provides good properties for strong bonding and stitching with nails. The plastic layer allows you to securely fasten the means of mechanical fastening, such as heel nails, rivets or spikes of the elastic element in the model insert. Since the stiffness of such an insole is determined by the plastic layer of the model insert, it becomes possible to make the base of the insole of uniform thickness along its entire length. The plastic layer also allows forming a model insert of a given shape of sufficient rigidity to bend the sole of the shoe, while the model insert is formed in at least two planes: vertical and horizontal.

 Layers of textiles are made mainly of non-woven material with a surface that creates ease of use. Fiber for the manufacture of textile layers is selected mainly from synthetic materials with limited moisture absorption in relation to cellulose.

The invention is further described in more detail with reference to the accompanying drawings, in which:
FIG. 1 illustrates a vertical cross section of the claimed insole;
FIG. 2 shows a rear view from the heel side;
FIG. 3 shows a top view of the claimed insole.

 The insole is a base 2 with a model insert 1 attached to its bottom surface. The model insert consists of three layers, one of which is made of a plastic plate 1b, and the other two layers 1a and 1c are made of textile superimposed on both sides of the plastic layer, while one of these textile layers is adjacent to the base of the insole 2 in the plane of their mate. The upper textile layer 1c forms mainly the contact surface with the lower surface of the base of the insole 2, while the plastic 1b and the lower textile 1a layers are arranged stepwise in front of the model insert 1, because the model insert is usually narrowed in thickness at its front. The drawing also shows a metal elastic element 3 attached to the model insert with rivets or any other means of mechanical fastening 3a, while the elastic metal element 3 remains inside between the model insert 1 and the base of the insole 2, and the heel nails 4 piercing the model insert are indicated by a dashed line , with hats resting on the upper surface of the model insert 1 in the space between the model insert 1 and the base of the insole 2, and which remain there without additional gaskets, which ensures It is cured by the mechanical strength of the plastic plate.

 The base of the insole can be made of any previously known flexible material, such as "TEXON" or "BONTEX", tailored to the shape of the sole of the shoe.

 The textile layers 1a and 1c formed from fibers can be made in any suitable way, taking into account only the requirement for the forming fibers to have good bonding ability, for example when they are heated, or in any other way. Despite the fact that woven textile materials are also not excluded, preference is given to non-woven materials, which are relatively simpler to manufacture from fibers of the required quality, including mixtures thereof, and which are more technological in processing. The technological basis of the fibers used in the formation of textile layers is mainly synthetic plastic fibers, such as polyester. The plastic plate 1b can be made of any plastic having sufficient strength properties, mainly any thermoplastic material capable of thermoforming and which, after cooling, retains rigidity, which makes it possible to shape the back of the insole when paired with its base 2. In this case, only the front of the insole is subjected to bending in the region of the front joints of the consumer’s leg.

 Model inserts can be cut from comparatively large multilayer sheets that connect plastic plates in advance technologically and cover textile layers on both sides using any of the known methods.

 The following is an example of the manufacture of the claimed insole.

The insole is made by combining a model insert made in a special way with the materials commonly used in the manufacture of shoe insoles. Depending on the needs, the model insert is made of material with a thickness of:
2.5-3.0 mm;
3.0-3.5 mm;
3.5-4.0 mm or
4.0-4.5 mm.

 The thickness of the intermediate plastic layer is selected based on the specific requirements for the strength of the materials. The most likely choice is the thickness of such a layer from the range of 0.5-2 mm.

 Model inserts are usually cut by stamping. The blanks of the inserts are narrowed in thickness in their front part and, if necessary, along the edges. If necessary, a groove is chosen in each blank for the subsequent placement of the elastic element. The elastic element is fastened with rivets or protruding spikes on both sides. The model insert, as well as the base of the insole, is glued with polyurethane adhesive. The bonding surface of the model insert is dried by heat and ventilation. The model insert is softened by thermal exposure while activating polyurethane adhesive. A model insert, activated in this way, is placed on an appropriate place on the insole base and pressed together. In this case, a correspondingly molded mold is used, using an insole of a unified design, choosing the correct pressing time and the required pressure. After cooling the insoles thus obtained, its edges in the region of the model insert are beveled down with the appropriate tool. If necessary, the insole is additionally cleaned before packaging.

 It is not always necessary to use a separate elastic element, mainly in shoes with low heels, since the function of such an element can be performed by the plastic layer itself of a sufficient area.

 The inventive insole can be used in the usual way for shoe production. So, during the tightening operation, the upper part of the shoe is tightly tightened along the insole edges for its lower surface and fixed with nails (stitching the insole and bent over its upper part) or connected by gluing.

The inventive model insert has the following advantages:
good shape-forming ability under thermal influence;
the ability to maintain shape well under normal conditions;
maintain bending strength at low temperatures;
good torsional stiffness;
the possibility of making shoes with low heels without an additional elastic element;
good resistance to moisture in shoes for difficult weather conditions;
prevents the possibility of loss of elastic element or its damage;
safety for the user (lack of harmful technological components);
good properties for tightening at the same time both when fastening with nails and by gluing;
more reliable fixation of heel nails than in the well-known insoles made of cardboard (no special gaskets are required);
the possibility of using as an independent sole without imposing additional technological layers protecting the user.

Claims (8)

 1. A shoe insole with a model insert forming the inner surface of the sole of the shoe, including a base of the insole and a model insert attached to the bottom surface of the base of the insole, characterized in that the model insert has a multilayer structure including a layer of plastic coated on both sides with textile layers, made of fiber.  2. A shoe insole with a model insert according to claim 1, characterized in that the textile layers are made of non-woven material.  3. A shoe insole with a model insert according to claim 1, characterized in that the fiber forming the textile layers is made of synthetic plastics.  4. A shoe insole with a model insert according to claims 1, 2 or 3, characterized in that the nails of the heel part are attached directly to the material of the model insert.  5. A shoe insole with a model insert according to any one of claims 1 to 4, characterized in that the shape of the model insert, which determines the stiffness of the insole, is defined by a layer of plastic.  6. A model insert attached to the bottom surface of the insole base, giving a predetermined shape to the inside of the sole of the shoe, characterized in that the model insert has a multilayer structure comprising a layer of plastic coated on both sides with layers of textile made of fibers.  7. The model insert according to claim 6, characterized in that the textile layers are made of non-woven material.  8. The model insert according to claim 6 or 7, characterized in that the fiber forming the textile layers is made of synthetic plastics.

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