DE7032274U - SHOE SOLE. - Google Patents

Description

V 1004

DR. MOLLER-BORC DR. Kt '.MiTZ DR. DEUFEL

DIPL-ING. FINSTtfF.WALD ■ DlPL-ING. GRÄMKOW

8 MÖNCHEN 22, ROBERT-KOCH-STR. 1

VIBRAM S.p.A. - Via Donizetti 49, Milan / Italy.

Shoe sole.

The object of the innovation was a Gusuni for shoes; and relates in particular to such a new construction of such a sole that its weight compared to known Rubber soles is much lower, although their other characteristics, v. the mechanical strength, wear resistance and Flexibility, at least unchanged.

In the field of shoes, especially winter shoes, is it is common practice to have soles made of rubber or rubber-like soles To produce materials which are then generally used with the other shoe parts, i.e. essentially with the upper leather and are preferably connected by gluing. In the manufacture of shoes, the use of preferred by wooden strips, which, however, do not withstand the temperatures

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withstand, in which the vulcanization of the rubber is carried out becomes, so the most widely used way of connecting the sole with the upper leather is that of mutual gluing with the help of an adhesive.

The main disadvantage of such shoes is that the soles are heavy and to a certain extent also stiff, so that in particular wearing such shoes for long periods of time is uncomfortable and tiring.

Various attempts have been made to reduce the weight of rubber soles, these attempts being essentially aimed at based on replacing part of the solid rubber sole with foam rubber or a similar material which is suitable is to give the sole of the foot greater comfort and at the same time reduce the weight of the sole.

All previous attempts, such as the one in Italian Patent 350 453 and in the known German patent application M 1589 VIl / 71a described processes, saw in the essential before having an assumed part of the rubber sole a light, preferably sponge-like material, in particular with foam rubber, to be filled, with the Vulcanization of this material was carried out at the same time as that of the solid rubber forming the sole. The shoe upper leather was then glued directly to the sole attached to the foam rubber or by incorporating its edge therein during vulcanization. in the

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In the latter case, however, no wooden strips could be found use.

After the advent of the foam plasticο attempts were made to do the same to use to solve the problems mentioned above, where in particular the polyurethane foams were used, which are particularly suitable for the purposes made, especially because of the adaptability of the specific weight, their flexibility and the comfort of the shoes, as well their easy handling during processing.

First and foremost, attempts were made to produce foamed plastics directly to use as a substitute for the rubber in the manufacture of the soles, but the results in this regard are in view of the The problematic scuff resistance of these foams has so far been unsatisfactory.

It has also been proposed, instead of the foam rubber for filling the rubber soles that have been removed, the mentioned foams, in particular to use polyurethane foams. The shoe upper leather was of course then onto the foam plastic glued on, which led to serious defects, as the adhesive connection between the upper leather and the foam plastic only umi also only has a very low resistance A slight impact of the toe of the shoe against a hard obstacle caused the adhesive bond to break.

The problems and disadvantages briefly described so far are completely and advantageously due to the shoe sole according to the invention eliminated. The shoe sole according to the innovation includes

a pre-vulcanized rubber shell, its external shape and dimensions correspond to those of the sole to be produced and is characterized in that this shell has parts which are suitable for partially closing off the cavity defined by the shell at the top, said cavity is filled with a flexible plastic foam, whose Density is less than 0.50, preferably less than 0.20.

Said parts of the shell consist in particular of one bent horizontally radially inward from the upper edge of the shell Edge part, which is divided into a series of tongues by incisions.

The neuerungsgenäße sole actual "osit essentially by dL n upper zungenfCrmig divided rubber edge part in which no erankenmg only a fixed bond between the sole and the shoe uppers, but also a" of the cavity of the rubber shell filling plastic foam allows the the in the slots between Tongues of the edge part engages.

The neuerungsgemaß preferably plastic foam used is foamed polyurethane, which is not only particularly flexible and soft, but may be hardened in the final form at temperatures of the order of magnitude of 50 ⁰ C.

As part of the present innovation can also be inside the cavity of the pre-vulcanized rubber shell further anchoring elements can be provided in one piece with the shell,

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through which the solid connection between the rubber shell and the polyurethane foam filling is reinforced,

The main advantage achieved by the innovation is there in the lightness and comfort of the sole and thus of the shoe. Depending on the strength of the sole, namely through the innovation related to a reduction of their weight by 20-40 ^ to the weight of a solid rubber sole of the same dimensions.

Another equally important advantage is that the suppleness and performance of the with the innovation Shoes obtained from the sole are at least the same as from shoes provided with a conventional solid rubber sole are, the manufacturing techniques of the actual shoe are completely the same as they have been for the manufacture of Shoes with conventional rubber soles were used.

The innovation is explained in more detail below with reference to the drawing using an exemplary embodiment.

Fig.l shows a shoe sole according to the innovation partially cut in plan view,

Fig.2 is a longitudinal section through the sole along the line H-II of Fig.l,

Fig. 3 and 4 are cross-sections through the sole according to the lines HI-III or IV-IV of Fig.l,

5 is a further longitudinal section through the sole analogously jr.nem of Fig. 2 and

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6 and 7 are cross-sections along the lines VI-VI and VII-VII of Fig. 5.

Figs. 1-4 of the drawing show a shoe sole, «trl ^ -he from a shell 10, which has a bottom part 11 and a heel part 12 encompassed by an upright wall 13, which follows the total circumference of the sole. the Wall 13 ends at the top with an edge part 15, which is horizontal inside the cavity 14 formed by the shell 10 and divided into a plurality of tongues 16 by slots 17 is, wherein the slots extend over the entire width of the edge part 15. It should be noted that the seat 17 expand towards the center of the cavity 14.

Mushroom-shaped anchoring elements protrude from the bottom of the cavity 14 l8, the height of which is less than the depth of the cavity 14.

As is clear from the figures, the behaves on the ground side by the parts 11 and 12, laterally by the wall 13 and above by the edge part 15 limited cavity 14 of the shell 10 like a mold cavity in which the polyurethane mixture i '| is injected, which after an appropriate heat treatment

j ι forms a soft and flexible mass 19 to complete the reaction between the components and the foaming agent,

; which with the help of suitable means at the same level as the upper one

Edge part 15 is held.

The surface of the finished sole (see Fig. 1) is thus on the side limited by the tongues 16 and is through the foamed

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Polyurethane, ο 19 formed, which the anchoring elements 18 including

As a result of the special shape of the slots 17, the polyurethane foam penetrates also between the tongues 16, whereby its anchoring to the shell 10 is further improved.

The surface formed by the tongues 16 allows a perfect Gluing the upper leather to the sole.

In the embodiment shown in FIGS Wall 13 of the shell 10 beyond the re-entrant edge part 15 extended upwards (edge 20), whereby a sole is obtained that is suitable for shoes with a so-called plug-in frame, the 21 is designated, is suitable.

After a shoe is usually perpendicular to its longitudinal axis of symmetry is stressed on bending, the slots 17 are in the edge part 15 preferably offset in such a way that no two slots come to lie in any cross-section.

Performed fatigue bending tests, which rubber soles normally have have shown that the sole according to the innovation easily withstands these bending stresses. It is Finally, it should be noted that the edge part 15 », which is used to glue the upper leather to the sole, is also different from may have the shape shown in the drawing. For example, along the opposite sides of the top edge of the Shell an enclosure may be provided in association with a support and a block part.

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Claims (8)

Protection claims 1. S, sole consisting of ciaer pre-vulcanized rubber shell, the outer wall and dimensions are those of the ones to be produced The sole is characterized in that the shell (10) has parts (16) to which the shoe upper leather can be glued and which are arranged in such a way that they only partially open the cavity (I4) enclosed by the shell (10) at the top complete, wherein the cavity (I4) is filled with a flexible foam plastic (19), which has a density of less than 0.50. 2. Sole according to claim 1, characterized in that the cavity (14) of the shell (10) partially closes at the top Parts for gluing the Schuhoberlede ^ s consist of a horizontal edge part (15) that extends from the upper edge of the side wall (13) the shell (10) protrudes radially inward. 3. Sole according to claim 2, characterized in that the Edge part (15) is divided into a plurality of tongues (l6) by radial slots (17), the slots (l7) facing each other expand the interior of the cavity (14), 4. Sole according to claim 1, characterized in that from the bottom of the cavity (14) inwardly anchoring elements (l8) protrude, which consist of one piece with the öoden of the shell (10). -ö- 703227419.11.70 5. Sole according to claim 4, characterized in that
the anchoring elements (18) have a mushroom shape . 6. Sole according to claim 1, characterized in that the flexible foam plastic has a density of less than 0.20 . 7. Sole according to claim 1, characterized in that the foamed plastic consists of foamed polyurethane. 8. Sole according to claim 1, characterized in that the parts (l6) to which the shoe leather is glued protrude at a mean height of the side wall (13) of the shell (lO), so that the same is a so-called plug-in frame ( 20-21)
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