SPORT SHOE SOLE STRUCTURE

Abstract: A sport shoe sole structure in which the anti-slip device is fixed to the sole from the inside with a flanged threaded shank (4) inserted through the sole and in which the top part of the anti-slip device (8) fits into a recess in the outer surface of the sole.

Description: Sport shoe sole structure This invention relates to the structure of the sole of a sports shoe that is fitted with anti-slip devices and espe¬ cially to the way in which the anti-slip devices are attached The structure is particularly well suited to football boots. The main part of a football boot stud nowadays is a threa ed steel shank. Fixed to the sole is a steel disc threaded in ternally to take the shank. A construction like this makes the boot very heavy. In or der to reduce the weight, attempts are being made to make the sole as thin as possible. This, however, is not recommended a the studs then hurt the soles of the feet. This method is also unpleasant because it is rigid. It does not allow the stud to absorb impacts. Modern-day studs also cause injuries to other players, particularly if the moulding over the steel shank has worn away. The modern-day construction is, in addition. Very expen¬ sive to produce. Other ways of attaching studs have also been suggested, no really successful solution has yet been found. Either the method has had the drawbacks mentioned above, or else the co struction has been too weak or too complicated. Patent specification GB 1 399 147, for example, describes a structure consisting of a pillar with internal and externa threads and adapted to extend through the sole. The external thread receives a retaining washer and the internal thread i adapted to receive the threaded steel shank of a stud. The stud has a moulded covering fitting into the retaining washe This construction is, however, very complicated and expensiv Patent specification SE 379 923 describes a structure in which the stud is screwed onto a threaded steel shank extend ing through the sole. On the outer sole there is a platform and washer to take the stud. Without the threaded steel shank this construction would not withstand powerful lateral impacts, which in football ca reach a force of nearly 200 kg. Also the stud platform and washer weaken the support reaction here. Another weakness of the models referred to above is the plurality of places for joints and grooves to which mud part- icles easily attach themselves. The number of particles stead ily increases until larger lumps are formed, which increase the weight of the boot and reduce grip. Patent application DE 25 42 116 describes a structure in which the inner face of the stud carries a cylindrical threa ed socket and in the middle of it a threaded shank extending above the cylinder. The sole of the boot has a corresponding threaded shank to take the cylinder and in the middle of it a threaded socket for the stud shank. In addition the inner fac of the stud may have a ringlike projection and on the sole of the boot a similarly shaped recess to take it. Being made of plastic, however, this model has not shown itself to be suf- ficiently durable. The purpose of this invention is above all tg achieve a construction for an anti-slip device that is lighter than those in use at the moment but at the same time offers " suf¬ ficient support. To this end, the essential feature of this invention is that the anti-slip device is attached to the sole with a threaded shank, the pillar of which is screwed through the so from the inside and into a corresponding seat in the anti- slip device, and on the outside of the sole there is a recess to take the inner surface of the anti-slip device, when the latter is in place. In addition the anti-slip device may have a collar-like lip that fits against the outside of the sole. To lock the anti-slip device into place, the surface in contact with the sole can carry a number of flexible, tongue-like projections and the sole seats for the projections, or alternatively the sole can have the.projections and the anti-slip device the seats. The sole structure described here is best made from some suitable plastic materials. This makes the boot much lighter than conventional football boots, which have steel supports, yet the sole of the boot can still be made thick enough to be comfortable. The structure described in this invention still gives sufficient support thanks to the flange on the threade shank and the recessing of the anti-slip devices into the sole. The strength of the structure has also been confirmed in actual games. The structure described here can be made to provide the right amount of flexibility. This makes the boots more com¬ fortable to play in and reduces strain on the feet. The abse of steel in the studs also reduces the danger of other playe being injured. The locking mechanism for the anti-slip device described in the invention ensures that the studs stay exactly in place. This is particularly advantageous with the highly ef¬ fective three-sided studs mounted so that one side faces di- rectly backwards towards the heel. The tongue also increases flexibility, particularly by reducing the force of impacts . coming from the side. The structure described in this invention is easy to pro duce. • The invention is illustrated in terms of one particular mode of performance in more detail by the accompanying draw¬ ings in which: Figures 1a and 1b show separate parts of the structure, Figure 2 is a plan view of the location of the stud and seating in the sole of the football boot, Figure 3 is a sectional view from Figure 2 taken at point A, Figure 4 is a sectional view from Figure 3 taken at point B, Figure 5 is a sectional view from Figure 2 taken at point C. The main parts of the sole structure (Figure 1a) are: th sole of the boot 1, the stud 2, and the stud seating 3. The parts are best made from suitable plastic materials. The stu are best made from a softer material than the sole. The stud seating (Figure 3) has a threaded shank 4, whic is inserted from inside through a threaded socket 5 of appro priate size for the shank 4 in the sole, and the flange 6 whi fits into a recess in the inner surface of the sole. The flan 6 is shaped in such a way that .the stud seating 3 cannot tur in the sole 1 (Figure 1b) . The inner part-of the sole is mad in the form desired. The stud has a threaded seat 7 for the threaded shank 4. The top part 8 of the stud is cylindrical and fits tightly into the recess 9 on the outside of the sole. The stud is shaped like a regular tetrahedron with one side facing direc ly backwards towards the heel when the stud is in place. The stud and seating are best designed in such a way tha a small gap remains between the end of the threaded shank 4 and the threaded seat 7 of the stud. In this way the top par of the stud is sure to fit tightly into the recess 9 in the sole. If the threading is very tight, it may be necessary to make a small air vent in the stud in order to make it easier to thread it into place. The flange 6 of the seating should be thicker towards th centre. This reduces the chance of it breaking. The edges of the stud carry projections 10 which fit tightly against the sole. On the underside of the projection 10 is a tongue 11 running perpendicular ' to the tongue. The sole has a locking place 12 for the tongue 11. When the stud is screwed into place, the sole yields slightly, becoming co cave, and the projection 10 also gives so that the tongue 11 can move from one locking place 12 to another. In order to m it easier to move the tongue its leading edge 13 tapers more gently than the back edge. When the foot presses down on the sole, the sole does not yield and the stud remains in place. The stud can be removed when. necessary using the appropriate tool. Between the flange of the stud seating 6 and the sole it is best to leave a small gap. This gives the sole 'some elas¬ ticity which makes it easier to move the tongue 11 from one locking place 12 to another. The elasticity also absorbs im¬ pacts '' striking the stud at right angles. The projections 10 also have a static effect, improving the stud's grip in all directions; they also give the lock greater flexibility against strong impacts. The sides of the stud also have a lip 14 which presses tightly against the sole. The sole has been rounded off by 2 - 6 mm where it meet the edge of the lip 14. Thanks to the lip and the rounding of mud does not easily cling to this point. The lip also in¬ creases flexibility in the vertical direction. A low platform with a gently tapering edge to take the stud has been made on the sole. In other respects the boot can be made as required for its intended purpose and the materials to be used.

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Inventors: KOSKELA TAUNO, KOSKELA, TAUNO
Applicants: KOSKELA TAUNO, KOSKELA, TAUNO
Application year: 1986
Main classification: A43C15
IPC codes: A43C15