JPH0352962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to footwear that can be removably equipped with a grounding stud. This type of footwear is often used by people who play sports. The stud is
Their general purpose is to firmly engage footwear with the ground, and they come in a variety of shapes. For example, some have flattened or rounded ends, and others have pointed ends, like spikes.
However, in this specification, for convenience of description, these are collectively referred to as studs.

Removable or replaceable studs typically include an externally threaded spigot. Each spigot is threaded into a socket in the underside of the footwear with complementary internal threads. Several methods have been proposed for providing these sockets in footwear. For example, in one example, sockets may be made individually and attached to the footwear, or may be integrated into the footwear. If the sole or heel of the footwear is made by molding plastic material, a plurality of pre-made sockets are placed in the mold and the sole or heel of the footwear is molded around them. It's okay. The socket includes a locking portion for engaging the sole or heel portion of the footwear surrounding the socket. This lock prevents the socket from becoming detached or loosening from the sole or heel during use. When the user runs or walks, the stud is subject to large stresses and these stresses are transferred to the socket, making it susceptible to loosening. Furthermore, when the stud is screwed into or removed from the socket, rotational force is applied to the socket, and this rotational force can loosen the socket and sometimes destroy part of the sole or heel of the footwear. Distort it. This causes the socket to rotate relative to the sole or heel of the footwear about the axis of rotation of the internal thread. These problems may be overcome by using sockets of improved design. However, attempts have been made to solve these problems by applying an insert having a relatively large area and having a plurality of integrated sockets to the sole or heel of the footwear to be molded. . The known insert includes a plate made of spring steel and a plurality of die-cast sockets, each having an integrated tag. The tag is inserted into the slot of the board and deformed,
Mounted on the board. These types of inserts are expensive to manufacture and reduce the flexibility of the footwear, making it less comfortable to wear. Furthermore, the board is prone to rust. Therefore, it was proposed that the insert be made into a single piece molded with plastic material. The insert includes a plurality of internally threaded sockets and support means interconnected with the sockets.

Ultimately, the major issue remaining is the bending stress generated in the stud spigot and transmitted to the socket due to the large lateral forces acting on the grounding end of the stud when the user runs or walks. The radial component of this causes the socket to expand.

The bending stress created in the spigot by a lateral force applied to the grounding end of the stud and transmitted to the socket tends to act upwardly on one side of the thread and downwardly on the other side. . By providing the stud with a flange that abuts the lower surface of the sole of the footwear, the stress that tends to act upwards is actually transmitted from the flange to the lower surface of the footwear, so that it does not substantially act on the screw. can do.

However, bending stresses that tend to act downward cannot be supported by the flange and the lower surface of the footwear, but are transmitted between the inclined support surfaces of the spigot and socket thread. The radially outward component of the bending stress thus transmitted to the socket causes the socket to widen and loosen the stud. If the socket becomes permanently deformed, a stud can no longer be attached to it and the footwear itself may have to be discarded.

Therefore, an object of the present invention is to solve such problems.

According to the invention, an insert for integration with footwear is constructed as a single molding of flexible plastic material and includes a plurality of sockets and support means interconnected with the sockets, The socket has internal threads for receiving an externally threaded spigot of a grounding stud, the internal threads having a bearing surface for transmitting axial forces from the spigot to the socket in use. of the bearing surfaces of the internal thread of each socket, the bearing surface facing towards the upper or inward end of the socket extends from the axis of the internal thread perpendicularly or substantially to the axis. An insert is provided which is characterized by a flat support surface defined by a generally vertically outwardly extending generatrix.

The flat support surface thus appears as a straight line perpendicular or substantially perpendicular to the axis of the internal thread when the socket is cut in a cross section that includes the axis.

When an axial bending force is applied to the stud such that the thread of the stud's spigot presses against the flat bearing surface of the corresponding thread of the socket, this force is transmitted axially to the socket. be done. In this case, no or only a small radial outward force occurs, which would occur if the flat support surface were an inclined or non-flat surface. In conventional sockets with conventionally shaped threads, both the upper and lower bearing surfaces of the screw are sloped. Thus, when a conventional stud is subjected to an axial bending force, the threads of the spigot are forced against the sloped support surface of the socket, forcing the socket to splay outwardly. in fact,
In such cases, the socket may crack due to the outward force. When such a situation occurs, the entire footwear becomes useless. Even if no cracks occur, the socket may have widened, either temporarily or permanently, so that it is no longer possible to grip the stud spigot as firmly as before. However, if a flat support surface is used as described above, when an axial force is applied to the stud due to bending,
This makes it possible to prevent or suppress the generation of outward forces.

In use, when the stud is subjected to a downward axial force due to bending, the threads of the stud's spigot are pressed with great force against the complementary flat support surface. The downward axial force experienced by the stud is a force that tends to dislodge the stud from its socket. This downward force tends to be strongly exerted by the stud on the socket, particularly when a lateral force is applied to the protrusion of the stud to bias the stud against the socket. If the generatrix of the flat support surface is relative to the axis of the screw
If the angle is other than 90°, the error should preferably be within 5°, with a typical preferred error of 3°.

It is possible that both the upper and lower bearing surfaces of each screw are flat, but preferably only one bearing surface is flat. The thread of each socket is preferably a single thread, but
A multi-thread thread can also be used within the scope of the invention.

Preferably, each of the insert sockets is shaped so that the stud can be completely replaced and removed.

Preferably, each socket or at least one group of sockets is closed at its upper end. This strengthens the socket and
It also provides a favorable flow of plastic material during the molding process. That is, it is preferable for the plastic material to flow primarily axially into the mold cavity for each socket rather than flow circumferentially. This is because if the flow is made to flow in the circumferential direction, the strength will be weakened at the point where the flows of the two plastic materials meet, and there is a possibility that a so-called hot water boundary may occur. Furthermore, when making soles and heels of footwear, the insert can be placed in the mold so that the plastic material used to make them flows over the closed end of the socket, allowing the plastic material to flow into the socket. Does not require any means to prevent it from collapsing. If the upper end of the socket were to be an open end, a flow prevention means would be necessary. However, within the scope of the invention, at least some of the sockets may have open ends at their upper ends. In this case, cylindrical sockets are used, each socket hole having an upper part extending inwardly into the support means. The upper part of this hole is
It may be internally threaded or adapted to fit over a portion of the stud's spigot in use. In this way, the thickness of the entire insert can be reduced.

Preferably, the support means is layered with first and second surfaces extending parallel to each other. Preferably, the first side is uninterrupted by a socket, and the socket projects from the second side. In use, the first surface will be the top surface and the second surface will be the bottom surface.

The layered support means may be a plate without holes;
Alternatively, it may be a plate with holes. In the latter case,
It can also be in the form of a strip.

Inserts according to the invention can be manufactured at relatively low costs. It is also more flexible than conventional spring steel plates. In particular, when a plate with holes is used, the resistance to bending is very low, and it can be bent in a variety of ways compared to a metal plate. It can also be designed to be flexible about both the transverse and longitudinal axes at the same time.

As an insert for a footwear sole, it is desirable to arrange a plurality of sockets adjacent to the outer periphery of the support means and spaced apart from each other. If the support means comprises a perforated plate, the socket is preferably supported by a peripheral strap forming at least part of the support means. The strap surrounds a central region that is either completely open or has one or more sub-straps. The insert can be manufactured in a molding process. In this case, the plastic material is poured into the mold at or near the center of the central region and defines the peripheral straps and sockets through channels that define the secondary straps extending radially from the inlet. Guide you to the part where you can achieve.

As an insert for the heel of a footwear, as for the sole of a footwear, it is preferred that the support means be perforated and include a peripheral strap supporting the socket. However, in this case the central region surrounded by the peripheral straps is usually open and does not have secondary straps. Alternatively, the support means may include an arrangement of radial straps supporting the socket. In yet another configuration, the support means is a plate without holes;
The plate may support a plurality of sockets spaced apart from each other adjacent the outer periphery of the plate.

Each socket is used with a stud having a threaded spigot having one or both flat bearing surfaces complementary to the flat bearing surfaces of the threads of the socket.

The spigot has a flat support surface facing toward the grounding end of the stud. Further, it is preferable that the generatrix line does not form an angle of 5° or more with respect to a plane perpendicular to the axis of the screw, and in a typical example, this angle is 3°.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The insert 1 shown in FIG. 1 includes an integral molding of high impact acetal resin, such as the material sold under the trade name Delrin 100 by DuPont. The molding member may also be made of rubbery nylon, such as ST (Super Tough) nylon, also sold by DuPont. The insert 1 includes a support plate 2 of uniform thickness. The support plate 2 is provided on one side with a plurality of sockets 3 arranged adjacent to the outer peripheral edge 4 and spaced apart from each other. The support plate 2 is not perforated and has a shape that roughly corresponds to the shape of the sole of the shoe. As discussed below, the insert is intended to be integrated with, for example, the sole of a golf shoe. Also, although the shape of the outer circumference of the insert is similar to the sole of a shoe, the length and width of the insert are somewhat smaller than those of the sole so that the sole extends slightly beyond the outer circumference of the insert. ing. As shown in FIG. 2, the outer peripheral edge 4 of the insert has a semicircular cross-sectional shape.

Each socket 3 has a substantially cylindrical shape and is closed at its upper end by an integral circular closing plate 5. The upper surface of the circular closing plate 5 has a height that coincides with the upper surface of the support plate 1. The advantages of closing the upper end of each socket have been described above. Each socket 3 is provided with a screw 6 on the inside. This screw 6 is a single-start screw with a special cross-sectional shape. As shown in Figures 7 and 9, the screws are 2
It has two main support surfaces 7 and 8. These support surfaces 7, 8 are surfaces along a generally axial spiral of the socket 3 and cooperate with complementary surfaces of the stud which will be described later. The generatrix of the support surface 7 is inclined with respect to the axis of the socket 3, indicated at 9 in FIG. However, the generatrix of the support surface 8 extends approximately perpendicular to the axis 9 of the socket. The angle between the generatrix of the support surface 8 and a plane perpendicular to the axis 9 is only about 3°. The support surface 8 can therefore be said to be a substantially flat support surface. The outer edges of the support surfaces 7 and 8 are
They are respectively connected to both side edges of the inner end surface 10 having a cylindrical shape. Between the threaded valley and another adjacent valley there is a cylindrical surface 11 of the hole of the socket 3 which remains unthreaded. As is clear from Fig. 7, the cross section of the socket thread is
It has a truncated shape with the tip of a regular screw cut off.

Another form of insert is shown in FIGS. 3 and 7. The shape of the outer periphery of this insert 12 is the same as that of the insert 1. Moreover, the insert body 12 is
It includes a plurality of sockets 13 having the same shape and arrangement as the socket 3 described above. However, the support plate of the insert 12, unlike the support plate 2 described above, is perforated and also includes a peripheral strap 14. Peripheral strap 14 supports socket 13 and surrounds a central area containing secondary strap 15. Secondary straps 15 extend radially from the central portion 16 of the insert 12. During the molding process, plastic material is injected into the portion of the mold corresponding to the central portion 16, flows along the portion corresponding to the secondary strap 15, and into the portion corresponding to the outer periphery 14 and socket 13. The sub-strap 15 divides the central region of the insert 12 (the region inside the peripheral strap 14) into a plurality of sub-regions or holes 17. The holes 17 do not communicate with each other. The edges of the peripheral strap 14 and the secondary strap 15 are marked 1
As shown at 8 and 18, the lower side is chamfered.

FIG. 5 shows an insert 19, also an embodiment of the invention. This insert 19 is intended to be assembled, for example, in the heel of golf shoes. Insert 19 includes a support plate 20 supporting four sockets 21 on its underside. Except for the shape, the support plate 20 is similar to the support plate 2 described above. Further, the socket 21 is similar to the socket 3 described above. The insert 19 is made as a single piece by molding. insert body 19
can be made of materials similar to those from which inserts 1 and 12 are made, as described above.

The support plate 20 has no holes, and the sockets 21 are spaced apart from each other adjacent to the outer peripheral edge 22 of the support plate 20. In another modification (not shown), a hole may be provided in the center of the support plate 20.

As mentioned above, the insert 1 shown in FIG. 1 is intended to be integrated into the sole of a golf shoe, for example. The sole is made of multiple layers that are glued together and then sewn around the edges. This seam will be located just outside the outer periphery of the insert. The sole layer is made of leather and one or more other materials. The support plate 2 is sandwiched between the two layers of the sole and glued to these layers. The sole layer (one or more layers) that will be the underside of the support plate 2
has a plurality of holes corresponding in shape, size and arrangement to the sockets 3 so that the sockets 3 of the support plate 2 can extend therethrough. The sole layer(s) on the upper side of the support plate 2 does not have holes. The layer below the support plate 2 is the socket 3
so that the lower edge is positioned above the bottom surface of the sole by a short distance, for example about 1 mm, i.e. where the socket 3 slightly does not reach the lower edge of the overlapping hole in the lower layer of the support plate 2. A predetermined number of sheets are provided so that the sheet extends up to .

Another manufacturing method is to combine the two by molding the sole with the insert 1 embedded therein, using plastic, rubber or similar materials as the molding material. In this case, the insert 1 would be placed in a suitably shaped mold around which the sole or part thereof would be molded. In the finished state, the molding element, the sole, surrounds the entire circumference of the insert except for the lower end surface of the socket 3. The lower end surface of the socket 3 is flush with or slightly above the bottom surface of the molding member (note that the material to be molded is of course prevented from entering the interior of the socket 3). FIG. 10 is a fragmentary cross-sectional view of the molded sole 23, showing one of the sockets 3 extending slightly above the bottom surface of the sole 23.

The insert 12 may similarly be assembled to the sole of a shoe using any of the methods described above for assembling the insert 1 to the sole of a shoe. However, in the case of insert 12, the material forming the sole of the shoe is
This method is better because it can flow through the holes 17 in the perforated support plate 2, so that it is integrated with the shoe being molded.

Insert 19 for the heel is similar to inserts 1 and 12
It may be combined with a molded heel in much the same manner as is combined with a molded sole. In fact, the sole and heel may be molded entirely together, with the inserts 1, 12, 19 embedded therein. However, in an alternative method of manufacture, the heel insert 19 may be sandwiched between layers made of leather or other suitable material and held together by nails adjacent the periphery. The nails are positioned beyond the outer periphery of the support plate 20. The heel layer and insert 19 may also be adhesively attached to each other. When assembling the heel, before nailing the periphery of the heel, place one or more tapered nails near the center of the heel for temporary fixation. This tapered nail will be removed later. This assembly method is one of the known methods. If this method were used to create a heel that would be combined with the heel insert 19, a tapered nail would be driven through the support plate 20, or a hole would be provided near the center for the tapered nail to pass through. I would use an insert.

Each of the inserts described above is intended for use with studs, such as those for golf shoes, having a suitably shaped threaded spigot at the top. A typical example of a stud is shown in FIG.
The stud consists of two parts, one being a central steel pin 24 and the other being an outer plastic molding member 25.
The lower part of the pin 24 forms a grounded end 26, while the upper part forms a rivet 27. An outwardly facing flange 28 is provided between the grounding end 26 and the rivet 27. The molding member 25 has a spigot 29 which is externally threaded.
The lower end is provided with an outwardly facing dish-shaped flange 30. In the manufacturing process, the pin 24 and the molding member 25 are made separately, the rivet 27 is inserted into the spigot 29, and the rivet is inserted so that the molding member 25 is held pressed against the flange 28 as shown in the figure. be stopped. This form is detailed in British Patent No. 2028102. Molding member 2
5 can be made of any suitable plastic material such as acetal resin.

The stud shown in FIG. 6 is characterized in that it has a special shape that is complementary to the thread of the spigot 29 or the thread 6 of the socket 3. The shape of this screw is 8th
This is shown in detail in the figure. One bearing surface 31 of the screw has a generatrix oblique to the axis of the stud, while the generatrix of the other bearing surface 32 extends outwardly from the axis of the stud and substantially perpendicular thereto. The angle of inclination with respect to the plane perpendicular to the axis is about 3°. The support surface 32 can therefore be said to be substantially flat. The inner edges of the support surfaces 31 and 32 are
They are respectively coupled to both side edges of the cylindrical inner end surface 33. Between the threaded valley and another adjacent valley there is a cylindrical surface portion 34 of the outer surface of the spigot 29 that remains unthreaded.

In use, the stud spigot 29 is screwed tightly into the socket and the molding member 25
It is desirable that the flange 30 of the shoe be pressed against the bottom surface of the sole or heel and be elastically deformed to the extent that the dish shape is hardly noticeable. The threads of the spigot 29 engage the threads of the socket, as shown in FIG. 9, and the flat support surfaces 8 and 32 are pressed together. When the shoe is in use, lateral forces will be applied to the protruding grounding end 26 of the stud. Such forces tend to tilt the stud within the socket. On the side of the stud that is forced upwards, the flange 30 will be pressed more firmly against the underside of the sole, creating a reaction force at a point away from the stud axis a distance equal to the radius of the flange 30. let However, on the side of the stud that is biased downward,
The engagement between the flat support surfaces 8 and 32 resists downward movement of the stud. Since these support surfaces 8, 32 are flat, no outward or substantially outward forces are applied from the stud to the socket. If the supporting surfaces 8, 32 were inclined surfaces like the supporting surfaces 7, 31, such a lateral force would be applied. However, by arranging the flat support surface as in the present invention, it provides resistance to downward movement of the stud within the socket, rather than upward movement.

In another embodiment, not shown, the sloped support surfaces 7, 31 described above may also be flat support surfaces.

The screws are not limited to single thread threads, but may be double thread threads or multiple thread threads.

The flat support surface concept described above can be applied to a wide variety of sockets and studs other than those exemplified in this specification.

[Brief explanation of drawings]

FIG. 1 is a bottom view of an insert according to one embodiment of the present invention for integration with the sole of a golf shoe. FIG. 2 is an enlarged cross-sectional view taken along line 2--2 in FIG. FIG. 3 is a bottom view of an insert according to another embodiment of the invention. FIG. 4 is an enlarged cross-sectional view taken along line 4--4 in FIG. FIG. 5 is a bottom view of an insert according to one embodiment of the present invention for integration with the heel of a golf shoe. FIG. 6 is a cross-sectional view of a stud that may be applied to any of the inserts shown in FIGS. 1, 3, and 5; FIG. 7 is an enlarged view of a part of FIG. 2, showing the shape of the screw in detail. Figure 8 is an enlarged view of a part of Figure 6,
The shape of the screw is shown in detail. Figure 9 shows the 6th
FIG. 8 is a cross-sectional view of the portion shown in FIGS. 7 and 8 when the stud shown in the figures is engaged with the insert shown in FIG. 1; FIG. 10 is a cross-sectional view of a portion of a shoe sole combined with an insert according to an embodiment of the present invention. 1, 12... Insert body, 2... Support plate, 3, 13
...Socket, 6...Inner screw, 7, 8...Support surface.

Claims (1)

Claims: 1. An insert for integration into footwear made as a unitary molding of flexible plastic material, comprising a plurality of sockets and support means interconnected with the sockets. , said socket having internal threads for receiving an externally threaded spigot of a grounding stud, said internal threads having a bearing surface for transmitting axial forces from said spigot to said socket in use. of the bearing surfaces of the internal thread of each socket, the bearing surface facing towards the upper or inward end of the socket extends from the axis of the internal thread perpendicularly to the axis or An insert characterized in that it is a flat support surface defined by a substantially vertically outwardly extending generatrix. 2 The generating line has an angle with a plane perpendicular to the axis.
The insert according to claim 1, characterized in that the angle is less than or equal to 5°. 3. An insert according to claim 1 or 2, characterized in that each of said sockets is closed at said upper end. 4. said support means are in the form of a layer with first and second sides extending parallel to each other, said first side being uninterrupted by said socket, said socket being connected to said second side; An insert according to any one of claims 1 to 3, characterized in that it protrudes from the surface of the insert. 5. An insert according to any one of claims 1 to 4, characterized in that the support means comprises a plate without holes. 6. Claims 1 to 4, characterized in that the support means is in the form of a strip.
An insert according to any of the paragraphs. 7. An insert according to claim 6, wherein said support means includes a peripheral strap supporting said socket and surrounding an at least partially open central region. 8. An insert according to any one of claims 1 to 7, characterized in that the sockets are arranged adjacent to the outer periphery of the support means and spaced apart from each other. 9. An insert according to any one of claims 1 to 8, characterized in that the inner thread of the socket has a truncated cross section.