JP2622266B2 - Sockets and studs and their combinations - Google Patents

Abstract

An internally screw-threaded socket (1) for incorporation in an article of footwear, such as a golf shoe, is provided on its outer surface with teeth (5). A stud for use with the socket includes a flange (12) and an externally screw-threaded spigot which projects upwards from the flange and can be screwed into the socket. Teeth (14) on the stud, spaced outwards from the spigot, interengage the teeth on the socket when the spigot is screwed into the socket and prevent the stud being freely unscrewed. The teeth on the stud and socket may be ratchet-shaped so as to make it easier to screw the stud to the socket than to unscrew it from the socket. The teeth on the stud are preferably frangible so that at least some of them break off when the stud is unscrewed for replacement. The teeth may be so spaced and located that, irrespective of the relative rotational positions of the stud and socket, at least some of the teeth on the stud are free to assume their natural shape rather than being deformed by contact with the teeth on the socket.

Description

The present invention relates to footwear with studs, that is to say footwear of the type with or capable of being provided with studs.

For the sake of narrative convenience, the term stud will be used herein to refer to any projection that engages the ground during use. Thus, the term encompasses both blunt protrusions and blunt protrusions of the type sometimes referred to as spikes.

Similarly, for the convenience of the description, footwear, studs, and their components are described as if they were in the direction they would normally be used.

(Prior Art) Ordinary footwear is provided with a plurality of threaded sockets inside the lower end of which is opened. The socket may be at the sole or heel of the footwear or at both the sole and the heel. Studs used in such footwear include an externally threaded spigot that can be screwed into a socket. Preferably, the socket is made of a plastic material rather than a metal. This is because, generally speaking, they are lighter than comparable metal sockets and, unlike metal sockets, do not tend to corrode. Nevertheless, it is necessary or desirable to take measures to prevent the socket from being damaged during use. In particular, each stud may be provided with a retaining means, such as an upright ring, spaced outwardly from the threaded spigot. The arrangement is such that when the spigot is screwed tightly into the socket, the retaining means resists the tendency of the lower end of the socket to expand outwardly to an extent where there is a danger of the socket breaking or cracking. ing. In addition, the presence of the retaining means causes the studs to be tightly screwed up and the middle portion of the socket to extend outwardly, making the socket slightly barrel-shaped. This results in a relatively high frictional force between the stud and the socket, which helps to reduce the risk of the screws coming off without the stud being used for use.

Studs and sockets of the above kind are available in UK Patent No. 8518677
No. (Publication No. 2163037A) is described in detail in the specification (Toriman).

Nevertheless, sometimes the stud may not be screwed well into its associated socket or the stud may work loosely. In such a case, there will be little resistance to the action of the stud gradually loosening the screw. Any loosening of the screws in the footwear studs can be dangerous to the person wearing the footwear. In addition, if lateral forces are applied to the protruding studs, the associated impact on the socket is detrimental. That is, not only is the small length of the spigot engaged within the socket, but also the moment of force applied to the socket is increased as a result of the increased length of that portion of the stud protruding from the socket. Therefore, it is desirable to provide a means to reduce the risk of loosening the screws without the studs being removed.

 It is an object of the present invention to provide such means.

SUMMARY OF THE INVENTION From one aspect, the present invention is a combination of a threaded inside socket and a stud having a threaded outside spigot that can be screwed into the socket in footwear. The studs are spaced outwardly from the spigot and include teeth that interengage with complementary teeth on the outside of the socket, such that during use the teeth interengage when the spigot is screwed into the socket so that the studs are in place. The danger of loosening the screw is prevented.

The teeth on the studs are easy to break, and the configuration is such that the action of the studs disengaging from the socket when the spigot of the stud is screwed into the socket and the teeth on the stud and the teeth on the socket interengage at least to a certain extent is at least the tooth It is desirable that some be broken.

The configuration is such that in any relative rotational position that the stud and the socket assume when the stud is screwed into the socket, at least some of the teeth on the stud are free from their natural shape without being deformed by contact with the teeth on the socket It is desirable to take something like this. This can be achieved by making the number of teeth on the socket different from the number of teeth on the stud for convenience. Preferably, the number of teeth on the socket is less than the number of teeth on the stud. Desirably, the teeth on the socket are evenly spaced around the socket, and similarly, the teeth on the studs are evenly spaced around the spigot.

Viewed from a second aspect, the present invention provides a stud having an externally threaded spigot that can be threaded into an internally threaded socket for footwear, wherein the stud is spaced outwardly from the spigot and the spigot is threaded into the socket. Sometimes it is provided with teeth engageable with complementary teeth on the outside of the socket, the inter-engagement of which serves to prevent the risk of the studs coming loose.

The teeth on the studs have less resistance to rotation than if the surface facing the teeth of the complementary socket is inclined with respect to the axis of rotation when the stud is screwed into such socket and the surface is parallel to the axis of rotation. On the other hand, when the torque is applied to the studs in the direction necessary to unscrew the studs from the socket, the surfaces they face against the teeth of the socket do not tilt with respect to the axis of rotation or It is desirable to have a ratchet shape so as to be either inclined or sharp. The teeth on the studs are preferably provided on a retaining ring which is spaced outwardly from the spigot and which stores the end of the complementary socket according to the method and purpose described above.

The spigot and stud teeth are preferably made of a plastic material as the same molded part. Preferably, the stud has an outwardly directed flange located below the spigot and the teeth, the flange being able to engage a lower portion of the footwear on which the stud is mounted during use. The lower surface of the flange is preferably convex, but could be flat or even concave if desired.

Viewed from a third aspect, the present invention is an inwardly threaded socket for footwear, the socket interlocking with complementary teeth on a stud having an outwardly threaded spigot threadable into the socket on its outer surface. It is characterized in that it has a plurality of teeth, the interlocking of which serves to prevent the risk of the thread of the stud coming free. The teeth on the socket should be ratchet-shaped and the obstacles they impede to the teeth of the complementary studs when it is screwed into engagement with the socket will give them against the teeth on such studs when they come off the socket Desirably, it is smaller than the obstacle. Preferably, the teeth on the socket are retracted from the lower end of the socket so that the end of the toothless socket can be stored by complementary holding means on the stud.

A socket could be composed of independently formed components that were not connected to any other socket and would be retained in the footwear, but the socket could be built into or integrated into the footwear. It is desirably one of a plurality of the same kind of sockets that constitute a part of the socket unit. The socket unit can be incorporated into the sole or heel of the footwear. The unit designed to be incorporated into the sole will be hereinafter referred to as a sole plate. The socket unit can be manufactured from preformed components, but is desirably integrally formed of a suitable plastic material or the like. The molding is desirably in the form of a sole plate so that a plurality of sockets protrude from below. It is desirable that the upper surface of the sole plate be flat. Similarly, the lower surface of the sole plate may be flat. However, if desired, certain areas of the soleplate, especially around the socket, can be shaped to be thicker than other areas. Preferably, the thicker regions of the soleplate form bands, each of which extends across the soleplate between a pair of associated sockets. It is desirable to have at least some of the bands extend laterally across the footwear rather than longitudinally when the unit is incorporated into the sole of the footwear.

Preferably, the outer surface of each socket flares up and down on the teeth. In use, when the socket unit is assembled into the shoe, the socket projects downwardly into a hole formed in the sole or bottom of the heel. The hole is large enough to accommodate the socket and the teeth on the socket. The flared portion of the outer surface of each socket engages and slightly deforms the upper end of the associated hole with that portion of the bounding sole or heel sole. Therefore, the sole plate is securely positioned with respect to the sole or the bottom of the heel.

The sole of the sole or heel is likely to consist of a single layer of leather or other material, such as a plastic material, but the sole of the sole or heel may be composed of two or more separate layers of the same or different materials. It could be composed of the flakes formed.

Viewed from a fourth aspect, the present invention is a third aspect of the present invention.
Footwear comprising a plurality of downwardly-opening sockets according to the aspect.

Viewed from a fifth aspect, the present invention provides a footwear according to the fourth aspect of the present invention, wherein a plurality of studs according to the second aspect of the present invention are combined with the socket.

 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

(Example) The sole plate shown in FIG. 1 is to be incorporated into the sole of a golf shoe as described in detail below. The soleplate is made of a single piece of a suitable plastic material, such as acetal resin. The upper side (not shown) of the sole plate is flat, while the lower side is shaped to obtain various shapes. The main ones among them are a plurality of sockets 1 and a plurality of bands 2. Although this particular example has eight sockets, it should be appreciated that a different number of sockets could be provided if needed. Similarly, the number of bands can be changed as needed. Since the sockets are all the same shape and size, only one of them will be described below. The lower end of the socket is open, but its upper end is closed by an integral closure disc which is relatively thin compared to the thickness of the rest of the sole plate. The socket is made integral with the thread 4.
The outer shape of the thread is similar to that described in the specification of British Patent No. 2115683 to Triman, and will not be described further here. A plurality of teeth 5 are formed on the outer wall of the socket. The teeth are not shown in FIG. 1 for clarity. Although the embodiment shown in FIGS. 2 and 3 has five such teeth, a different number may be provided if necessary. The teeth 5 are evenly distributed around the socket and are all of the same shape and size. As is evident from FIG. 4, each tooth is ratchet-shaped and has on one side a surface 6 inclined with respect to the socket axis and on the other side a surface 7 parallel to that axis. The faces 6, 7 are connected at their lower ends by short end faces 8 perpendicular to the axis. The outer surface of each socket flares up and down at the top of the tooth as shown at 9.

Each of the bands 2 constitutes an area of increased thickness of the sole and extends between two associated sockets. The central portion of each band is bordered on each side by a wedge-shaped portion of uniform thickness. This avoids sudden thickness changes. The end of each band surrounds the socket and enhances the support effect on the socket. Since the band 2 extends transversely across the width of the soleplate as a whole, the band does not significantly interfere with the transverse deflection of the soleplate that is expected to occur during use. FIG. 2 clearly shows that the closing discs 3 at each upper end are thinner than the main part of the sole plate. That is, this allows the axial length inside the socket to be as long as possible.

The socket 1 is for receiving a stud. Each stud is composed of a support 10 composed of a plastic material such as acetal resin and metal pin elements (not shown). The support 10 comprises an outwardly threaded sleeve 11 forming a spigot which is screwed into one of the sockets 1. The support also comprises an outwardly facing flange 12. The pin element comprises a stem and a ground engaging head. In manufacture, the stem is inserted into the sleeve 11 and deformed after insertion to permanently fix the support and the pin element together. One such stud is Triman's UK Patent No. 20
The subject of 08102, the structure of which is not described further here. The annular holding ring 13 protrudes upward from the flange 12. The ring is spaced outwardly from sleeve 11 and is coaxial therewith. In use, when the spigot is screwed into the socket, the lower end of the socket below the teeth 5 enters the ring. The function of the retaining ring has been described in the previously mentioned UK Patent Application No. 8518677 (publication No. 2163037) and will not be described further here.

A plurality of teeth 14 project upward from the top of the retaining ring 13. In the illustrated example, there are ten such teeth, but a different number can be provided if necessary. Nevertheless, it is desirable to provide twice as many teeth on the stud as there are teeth on the socket for the following reasons. As can be seen from FIG. 7, the teeth 14 each have a ratchet-shaped, curvilinear front face 15, of which the upper part is substantially inclined with respect to the axis of the stud, and the rear face 16 is almost parallel to that axis. .

The flange 12 is generally saucer shaped and has a convex lower side and a concave upper side. A blind hole 17 is provided on the underside of the flange and serves to receive the pin on a face spanner used to screw the stud into and out of the socket. The blind holes 17 can be replaced with through holes if necessary. However, it is usually desirable to provide blind holes because the through holes may provide a path for mud to enter and clog the flange with the seat of the footwear. The flange rim has a different shape from that of the conventional design of the stud in that its upper side is inclined upwards. Taper is the outermost cylindrical surface 19 Frustoconical surface 18 extending above
Given by Providing an upwardly inclined rim on the flange of the stud is a common application and is not limited to certain studs that are the subject of the present invention.

Of course, the rim of the flange may take any other desired shape. For example, it may have a relatively sharp or rounded edge. Instead, it may be provided with upstanding peripheral ribs that seal tightly against the sole or heel of the footwear during use.

The soleplate and its associated studs work as follows.

(Function) The sole of the sole is incorporated into a golf shoe with the sole incorporated therein, and the sole of the sole is made of a piece of leather. During manufacture, the leather pieces are perforated with a substantially uniform thickness and circular holes are positioned and drilled so that each hole can accommodate an associated one of the soles 1 of the soleplate. The diameter of each hole is large enough to allow the teeth 5 on the associated socket to just enter the hole. If necessary, the size of the hole can be such that the soleplate must be held in place by friction by lightly pressing the socket into the hole. The leather near the lower end of each hole is milled to provide a shallow countersink of a slightly smaller diameter than that of the cylindrical outer surface 19 of the flange 12 of the stud. When the sole plate is assembled with the socket 1 projecting downward into the leather strip or hole, the lower end of each socket below the tooth 5 is further leveled with the upper end of the hole or protrudes into the dish for a short distance. The flare portion 9 of each socket engages and slightly compresses that portion of the leather bordering the upper end of the associated hole. The central portion of the band 2 rests on the upper surface of the piece of leather, leaving a gap between the rest of the sole plate and the leather. If necessary, those gaps can be filled with a suitable packing material, which is not usually considered necessary.

After the shoe is completed, the stud spigot is screwed into the socket. As each stud is screwed into place, teeth 14 on the studs will soon begin to contact teeth 5 on the socket. When the front face 15 of the tooth 14 comes into contact with the inclined surface 6 of the tooth 5, the tooth 14 first tends to elastically flex and ride over the tooth 5. However, as the spigots progressively rise in the socket, the teeth 14 tend to spread outwardly as they pass through the teeth 5. In doing so, they have a tendency to press into the leather part of the sole that borders the hole in which the socket is stored. If there is no leather,
There is also a tendency for the teeth 5 to deform. However, the presence of leather tends to prevent such a situation in which it abuts the partially cylindrical outer surface of the teeth.

When the stud is completely screwed into place, the lower end of the socket abuts the upper surface with the flange 12 inside the retaining ring 13. There will then be a strong frictional force that resists the stud unscrew. On the other hand, the rim of the flange 12 enters the countersink in the sole portion of the sole, and the frusto-conical surface 18 of the rim lightly and elastically crushes the leather bounding the countersink.
This configuration has several advantages.

(Effect) One is that the rim of the flange that enters the counterbore tends to pull the counterbore into a shape closer to roundness. This is because the leather may have become slightly elliptical during manufacture due to its slightly curvilinear shape. Another advantage is that the extent to which the flange 12 projects beneath the shoe is much smaller and the generation of indentations on the golf lawn on which the user walks is correspondingly smaller. In fact, only the central part of the flange projects below the level of the adjacent part of the underside of the shoe. Finally, another advantage is that when the sole flexes during use of the shoe, any slight relative movement that occurs between a portion of the sole and a portion of the flange 12 usually results in the rim of the flange being countersunk. It is not enough to leave. Thus, there is no gap between the flange and the sole where soil or grass enters during use.

As mentioned above, there are often a series of advantages to providing countersinks on the underside of the footwear to accommodate the outer portions of the stud flanges. Nevertheless, the provision of countersinks is not an essential feature of the invention and may be omitted if necessary. In such a case, the lower end of the socket may be at the same level as the lower side of the footwear or may project downward.

Similarly, when the studs are completely screwed into place, the end faces 8 of the teeth 5 will be only a short distance above the upper edge of the retaining ring 13. 5 teeth 5 are 5 of teeth 14
It is highly likely that the teeth 14 will engage outwardly and tilt outwardly into the leather. However, the other five teeth 5 do not engage and return to their original shape.

If, for some reason, the studs begin to loosen, the rear face 16 of the tooth 14 located between the teeth 5 will soon be
Further rotation of the stud relative to the socket due to the start of abutment with the surface 7 is prevented. There is considerable resistance to the danger of further loosening of the stud thread when the tooth abutment surface is substantially parallel to the axis of rotation. Nevertheless, if the studs are to be completely removed, for example if the ground engaging head of the pin element is worn, the studs can be unscrewed with a suitable surface wrench. When the studs rotate, the teeth protrude outward and project into the leather
The 14's pop out and are embedded in the leather, while the rest of the teeth also snap against the teeth 5 and pop out. When the studs are finally removed, their teeth 14 embedded in the leather fall quite easily and freely. When the stud teeth 14 are removed, the stud becomes unsuitable for re-use, making it easier to distinguish a discarded stud from a new unused stud.

If the stud happens to not be completely screwed into the socket during its installation, there is little frictional force serving to hold the stud in place. However, the interlocking of the teeth, as described above, usually serves to prevent loosening of the threads of the studs, either completely or partially.

In the above operating method, when the tooth 14 passes through the tooth 5,
It has a tendency to spread outward and into the surrounding leather.
It is therefore expected that a permanent annular groove will be formed in the leather, but in practice this does not occur and it can be seen that the leather gradually returns to its initial form. This is believed to be the result of the fibrous nature of the leather. This helps in snapping off the teeth as described above. Nevertheless, if a plastic material is used instead of leather (and that is a possible alternative), a more permanent groove can be formed by the teeth 14 while the stud is screwed into place. .
However, this is not critical to the operation of the present invention because the non-spreading teeth 14 prevent inadvertent loosening of the studs as described above. In addition, when the studs are actively forcibly unthreaded, the unexpanded teeth 14 snap off upon engagement with the teeth 5, while the expanded teeth quickly restore their initial shape and the teeth 5 It comes off in a snap type by colliding with. Even if some of the widened teeth remain outside the teeth 5 and on the studs, the lack of remnants is immediately apparent.

Slightly unpredictable, when using the above type of shoes, the sole (or other) portion of the sole below the soleplate is pushed up between the bar 2 of the soleplate to represent an uneven surface It turned out that there was little or no tendency. In fact, the bottom of the shoe tends to be unaffected by the presence of the ribs 2 and the gap between them.

It is desirable to avoid or overcome the tendency of the bottom hole of the footwear to open outward during use. In the above embodiment, for example, it is contemplated that the rim of the flange 12 sits tightly in the associated countersink at the bottom of the sole or heel, but avoids or overcomes the tendency of the countersink to open outward with its associated hole. It is desirable. Furthermore, in the above embodiment, the provision of a flared portion 9 on each socket tends to displace that portion of the bottom of the footwear directly adjoining the hole downward, so that the lower end of the hole flares outward.

To overcome or mitigate such problems and trends, structures are provided on the lower side of or within the socket units extending around each socket, each of which has a somewhat larger extent than the flanges on the associated studs therein. By providing an upwardly extending recess, the flange may have a tendency to drive an adjacent portion of the footwear bottom into the recess when the stud is clamped in place during use. The above structure can be formed only by providing a recess such as a circular recess in the socket unit. However, it is preferred that the structure comprise an annular rib concentric with the associated socket and somewhat larger in diameter than that of the rim of the associated stud. An uninvented embodiment in which such ribs are assembled is shown in FIG. 8, in which a part of the sole plate 20 is shown, and the socket 21 is the socket 1 shown in FIGS. Is similar to However, the sole plate 20 differs from that of FIG. 1 in that its lower surface is not provided with the band 2 and is flat for most of its area. The stud support 22 is shown fully engaged with the socket 21. Support 10 shown in Figs. 5 and 6
It is the same design as that of No. Portions of the socket 21 and the support 22 are given the same reference numerals as the corresponding portions of the socket 1 and the support 10. On the lower surface of the sole plate 20, an annular rib 23 is formed. The rib has a semicircular cross section and is concentric with the socket 21. Similar ribs are formed around each socket of the sole plate.

The sole of the sole is indicated by a dashed line 24. Initially, it forms a hole 25 for receiving the socket 21 with a uniform thickness. The hole has a countersink 26 at its lower end for receiving the rim of the support 10 flange 12. As mentioned above, the portion bordering the top of the hole 25 is slightly deformed by the flared portion 9 of the socket, while the rim of the flange lightly compresses the portion bordering the countersink. In use, when the stud is completely screwed into place in the socket, the rim of its flange 12 is pushed up against the sole of the shoe.
That portion of the sole adjacent to the socket unit vertically above the rim is located just inside the annular rib on the unit.
The upward force exerted on this portion of the sole by the rim of the flange, as indicated by arrow 27, has a tendency to push the sole upwardly against the socket unit just inside the annular rib. The ribs 23 therefore exert a downward force on the sole of the sole, as indicated by arrow 28. as a result,
That part of the sole between the annular rib 23 and the hole 25 suffers a couple,
Since the same couple takes a shape inward in the radial direction, the lower end of the hole 25 becomes smaller in size with the countersink 26, and the upper end of the hole is driven radially outward. The height of the annular rib 23 does not need to be large to obtain the desired effect.

Although the embodiments of the present invention described above with reference to the drawings relate mostly to sole plates, it should be understood that the embodiments may be applied to a socket unit and incorporated into the heel of a golf shoe or other footwear. The provision of annular ribs 23 or other structures which perform a similar function can be applied to other types of socket units, especially in the case of socket units in which the socket cooperates with studs without teeth and without teeth. Has value.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a bottom view of a sole plate for incorporation into a golf shoe, but a part of the sole plate is omitted for easy understanding. FIG. FIG. 3 is an enlarged cross-sectional view of the socket taken along line 2, FIG. 3 is a view of the socket of FIG. 2 from below, FIG. 4 is a detail of the teeth on the socket and FIG. 2 is a side view of a portion of the socket shown in FIG. 2, FIG. 5 is a bottom view of a support or stud body for use with a socket of the type shown in FIG. 2, and FIG. FIG. 7 is a side view of a portion of the stud of FIG. 6 when viewed in the direction of arrow B, with details of the teeth on the stud, FIG. In the scrap sectional view of the broken socket, the socket constitutes a deformed portion of the sole plate. 1 ... socket, 11 ... spigot, 10 ... stud, 5 ... complementary teeth, 14 ... teeth, 15 ... face, 13 ... retaining ring, 12 ... flange, 24 ... lower side.

Claims (12)

(57) [Claims] 1. A combination of an internally threaded socket (1) for footwear and a stud (10) having an externally threaded spigot (11) screwable into the socket. Has teeth (14) spaced outwardly from said spigod;
Said tooth is a complementary tooth (5) provided outside said socket.
To prevent interlocking of the teeth of the stud with the teeth of the socket when the spigot is screwed into the stud during use, thereby preventing the screw of the stud from loosening freely. The combination as described above. 2. The stud when the teeth of the stud are brittle and the spigot of the stud is screwed into the socket such that the teeth of the stud interlock with the teeth of the socket at least to a predetermined extent. 2. The combination of claim 1 wherein the action of unscrewing the stud from the socket is such that at least some of the teeth of the stud are broken. combination. 3. At least some of the teeth of the stud and the teeth of the socket, regardless of the relative rotational position of the stud and the socket when the stud is screwed into the socket. 3. A combination of a socket and a stud according to claim 1 or 2, characterized in that it can freely take its natural shape without being deformed by contact of the socket. 4. A stud (10) for footwear having an externally threaded spigot (11) that can be screwed into an internally threaded socket (1) and spaced outwardly from said spigot. A plurality of teeth (14) which are engaged with complementary teeth (5) provided outside the socket when the spigot is screwed into the socket. Wherein said interlocking of the teeth of the stud with the teeth of the socket prevents the threads of the stud from loosening freely. 5. A toothed surface of said stud, said tooth of said stud being ratchet-shaped, said tooth of said stud facing said tooth of said socket when said stud is screwed into a complementary socket.
Is tilted with respect to the axis of rotation and is adapted to provide less resistance to rotation than would be provided if parallel to the axis of rotation, while unscrewing the stud. The stud tooth surface (16) facing the socket tooth when the torque is applied to the stud in the direction required to disengage it from the socket is not inclined or initially inclined Surfaces mentioned in (15)
5. The stud according to claim 4, wherein the stud has a steeper slope. 6. The stud teeth are provided on a retaining ring (13) spaced outwardly from said spigot, said retaining ring receiving a complementary socket end. A stud according to claims 4 or 5, characterized in that the stud is adapted to resist the tendency of the socket to expand outward during use. . 7. The footwear according to claim 1, wherein said stud has an outwardly directed flange (12) located below said spigot and said teeth of said stud, said flange being used in a footwear to which said stud is mounted. A stud according to any one of claims 4 to 6, characterized in that it is engageable on the lower side (24). 8. An inner threaded socket (1) for footwear, the outer surface of which is provided with a plurality of teeth (5) which can be screwed into said socket. Is interengageable with a complementary tooth (14) provided on a stud (10) having an externally threaded spigot (11), by interengagement between the socket tooth and the stud tooth; The socket, wherein the studs are prevented from loosening freely. 9. The socket teeth (5) are ratchet-shaped so that when the complementary stud is screwed into the socket, the socket teeth impede the stud teeth. Wherein the teeth of the socket are less than the obstruction to the teeth of the stud when the thread of the stud is loosened and removed from the socket. Item 9. The socket according to Item 8. 10. The socket tooth (5) is located recessed from the lower end of the socket, whereby the end of the socket without the tooth is provided on a complementary stud provided on the stud. 10. Socket according to claim 8 or 9, characterized in that it is adapted to be received by a holding means (13). 11. A footwear socket unit comprising a plurality of sockets according to any one of claims 8 to 10, wherein the footwear socket unit comprises a plurality of sockets according to any one of claims 8 to 10. 12. A footwear comprising the socket according to any one of claims 8 to 10, comprising a plurality of sockets that are opened downward.