DE1100504B - Method for manufacturing a shoe with a vulcanized outsole - Google Patents

Description

GERMAN

The invention relates to a method for producing a shoe, in particular a work shoe, after which a trough bottom is formed "in situ" in a vulcanizing mold and at the same time at least with its edge part is vulcanized onto the listed upper shoe, with on the underside of the shoe upper a heat-insulating, cushioning insert made of lightweight material is placed on its free Surface is enclosed by the material of the outsole during the vulcanization process.

The purpose of the insert made of light material, which is fixed by the trough sole on the upper shoe floor, is that To improve the thermal insulation of the sole and at the same time the weight of the sole and thus the shoe to reduce.

A granulated rubber compound or a thermoplastic is usually used as the material for the trough bottom Plastic mixture of sufficient elasticity is used, which after conversion into the plastic state in the Molded press and vulcanization mold heated to about 150 ° C under pressure and finally through The effect of the heat is vulcanized or fully polymerized, whereby the "in situ" formed The sole is firmly connected to the upper.

If you look at the upper shoe - especially the edge of the upper leather - roughened before inserting the upper shoe into the pressing and vulcanization mold, results a very good adhesion between the trough sole and the upper shoe and also a perfect one waterproof connection.

The heat-insulating insert of the trough sole exists in the case of those previously produced by such a method Shoes made of felt, cardboard, cork or cork mixtures, which in turn can also contain rubber. The use of felt as an insert material has the disadvantage that with the high pressure inside the vulcanization mold, the softening material - from which the sole is formed - into the pores of the Felt penetrates and thereby makes the felt insert relatively hard and stiff. Cardboard inserts, cork sheets or cork mixtures usually have insufficient elasticity.

The use of a porous and highly elastic insert with a low volume weight is desirable, which on the one hand results in a soft bedding of the foot and on the other hand through periodic air displacement the "ventilation" of the foot in the shoe promotes when walking.

For shoes, the sole of which is prefabricated from rubber or plastic material as a hollow sole and then on The upper shoe is attached by gluing or welding, inserts are made of rubber or plastic foam material used, which has the desired high elasticity and which to achieve a ventilation emergency procedure for manufacturing a shoe with a vulcanized outsole

Applicant:

Dr. med. Klaus Maertens,
Seeshaupt (Obb.), St. Heinrichstrasse,

Dr.-Ing. Herbert Funck,

Munich-Pasing, Planegger Str. 83,

and Lupos shoe factory H. Lennartz K. G., Frankfurt / M., Kaiserstr. 16

Hubert Lennartz, Rheydt,
has been named as the inventor

Has agile porosity. Such porous inserts (Air cushion inserts) cannot be used with a method of the type described above, as the usual foam rubber or foam plastic material for the vulcanization of the sole material required temperatures and softens under the high pressure in the vulcanization mold is permanently squeezed, whereby the pores of the material close. This has the consequence that the elasticity and the ventilation effect of the insert can be greatly reduced.

Another disadvantage of shoes with vulcanized rubber soles or molded plastic soles and Inlays made of felt, cardboard or cork can be seen in the fact that the sole despite the elasticity of the sole material the internal tension present in the known air-cushioned soles with a highly elastic insert is missing, which pushes the outsole slightly convex outwards and together with the elasticity of the insert that Makes walking "softer" and more pleasant. This internal tension is absent even if it is somewhat elastic permanent inserts made of felt or cork.

The above-mentioned difficulties could be overcome according to the invention in that as cushioning insert a fully vulcanized or fully polymerized sole plate made of heat-resistant, highly elastic Foam rubber or foam plastic, in particular made of silicone rubber foam with a Heat resistance of about 150 ° C or above is used and that this insert when molding and vulcanizing the outsole in such a way that it is elastic

109 527/199

Claims (2)

is pressed together that the outsole after the end of the vulcanization process and after removal of the shoe from the mold under the effect of z. T. again relaxing insert bulges outwards. The heat-resistant insert material withstands the vulcanization temperature of around 150 ° C at relatively high pressure without permanent deformation and without closing its pores by sticking. When the pressure is released, an elastic expansion of the insert material takes place, which causes the desired internal stress state, which results in the resilient springiness of the sole, and the slightly spherical pressing out of the sole surface. When using the new method, the pressure required in the vulcanizing mold to form the sole made of plastomer material, which is usually around 8 atmospheres, but can also be significantly higher, is used to bring the cushioning material of the insert into a desired state of tension move, which then results in the desired slightly convex sole shape. The cushioning insert can only be arranged in the front part of the sole, in particular only in the ball of the foot, while the joint and heel part, in which particularly soft cushioning is not required, possibly even undesirable, remain without a cushioning insert. If necessary, a compact wooden insert can be provided in the shoulder to reduce the weight. In these parts of the sole, only the elasticity of the sole material itself is then effective. The present invention is not only limited to the use of vulcanizable rubber compounds as sole material, as described in the following exemplary embodiment, it can of course also be applied to shoes with elastic plastic hollow soles that are pressed or injected at above Softening temperature temperatures are molded directly onto an overshoe and at the same time firmly bonded to it, whereby the firm connection with the upper is favored by pretreating the adhesive surfaces of the overshoe with a liquid plastic solution that is partially absorbed into the upper material, in particular the edge of the upper can. It is important that the highly elastic porous insert essentially retains its high elasticity during the molding of the plastic sole onto the overshoe and that the sole, in particular the outsole surface, is slightly spherical after the shoe has been removed from the mold. In the drawing, the invention is shown by way of example; 1 shows a longitudinal section through the upper shoe bottom and the sole of a work shoe manufactured according to the new method, FIG. 2 shows a cross section along the section line II-II in FIG. the rubber molded soMe 2 vulcanized onto this upper and that between the upper and the. Heat-insulating elastic insert embedded in rubber sole 3. The section through the overshoe 1 shows the upper leather 4, the inner lining 5r an insole 6 <tttnd a line ^ fioMe 7. The insole 6- is in the usual way with the upper leather 4 and the: Lining 5 firmly connected, the insole 7 could for example be glued in with champagne. The insole and insole are provided above the insert 3 with ventilation holes (not shown in the figures). The heel part 2 α of the sole 2 contains a wood insert 8. According to the invention, the heat-insulating, elastic insert 3 consists of heat-resistant, highly elastic foam rubber or foam plastic, which is selected so that it is at temperatures of about 150 ° C, as when vulcanizing the Rubber sole 2 occur in the vulcanization form, retains its elasticity. There is an on in the joint of the work shoe. known, not shown in the drawing, incorporated the foot arch supporting insert. The molding of the rubber sole 2 and its simultaneous firm connection with the upper 1 takes place in a pressing and vulcanization mold, in which the upper, sitting on a last, is inserted together with the foam insert 3 and the amount of a granulated rubber mixture necessary for the production of the sole. The vulcanization mold is heated in the usual way and pressed together with high pressure, the rubber mixture assuming a plastic state. It fills the shape completely and connects firmly and watertight to the roughened or impregnated edge of the upper leather 4, which is roughened or impregnated in a known manner. When the pressure on the pressing and vulcanization mold is reduced after the vucanization of the solar material is completed, the elastic insert, which has remained highly elastic even at the vulcanization temperatures of around 150 ° C, expands in a resilient manner and thereby expresses the middle Part of the outsole (see. Fig. 2) slightly outwards, which creates the desired convex curvature of the outsole, which together with the high elasticity of the insert 3i results in the desired cushioning of the foot when walking. Foam rubber, for example silicone rubber, exist, but it can also be made from another elastic foam plastic that can withstand temperatures of at least 150 ° C. without losing its elastic properties. The elastic insert 3 can before inserting the upper i in the pressing and vulcanization mold on the shoe bottom of the Obersclrahes, for. B. by gluing, easily pinned or fixed; but you can also secure the position of this insert in the vulcanization mold by other means without connecting it over its entire surface with the shoe bottom. If no rubber is used for the production of the sole 2, but a rubber-like plastic, there is no significant change in the production method of the work shoe. It is only necessary to ensure, by appropriate pre-treatment of the connection point on the overshoe, that the plastic of the sole, which becomes plastic in the compression mold, becomes permanently hostile to the overshoe. P A T ENiT Λ N S E H: 0 CH ET: 1. Method for producing a shoe, in particular a work shoe, - according to which in a Vtäkamisierforni a trough sole "in situ" educated at the same time "at least with theirs Edge part on; vulcanized the listed overshoe becomes ,, with a heat insulating earth, cushioning on the underside of the shoe upper part Insert made of lightweight material is arranged, which is enclosed on its free surfaces during the vulcanization process by the material of the outsole, characterized in that the insert (3) is a fully vulcanized or polymerized sole plate made of heat-resistant, highly elastic foam rubber or foam plastic, in particular made of silicone rubber Foam with a heat resistance of about 150 ° C or above is used and that this insert (3) during the molding and vulcanization of the outsole (2) is so elastically compressed that the outsole (2) after the end of the vulcanization process and after removal of the shoe out of form under the action of itself partially relaxing insert (3) bulges outwards in a convex manner. 2. The method according to claim 1, characterized in that the insert (3) in per se known Way is only arranged in the front part of the sole, especially in the ball area, while in the paragraph part in a known manner, a relatively rigid insert (8) z. B. made of wood is provided. Considered publications:
French Patent No. 1,111,852;
Belgian Patent No. 495,374;
German interpretation document M 24564 VII / 7a (published on March 29, 1956). 1 sheet of drawings