EP2482943A1

EP2482943A1 - Multi-purpose shoe for walking and rolling, comprising laterally-folding wheels built into the sole

Info

Publication number: EP2482943A1
Application number: EP10778682A
Authority: EP
Inventors: Eddy Pennerath
Original assignee: Decathlon SE
Current assignee: Decathlon SE
Priority date: 2009-10-02
Filing date: 2010-10-01
Publication date: 2012-08-08
Anticipated expiration: 2030-10-01
Also published as: EP2482943B1; ES2522826T3; WO2011039435A1; US8915502B2; US20120222329A1; RU2012117793A; CN102648031B; FR2950818A1; RU2505333C2; PT2482943E; FR2950818B1; CN102648031A

Abstract

The invention relates to a shoe (1) comprising between one and four wheels (7, 8) which, for walking, are arranged horizontally in specific recesses in the sole (2) and which, for rolling, are pivoted about longitudinal axes (15) and locked in a vertical position using a single lock, such that they project downwards from the sole and convert the shoe into a roller skate.

Description

Versatile shoe for walking and running, with wheels integrated in the sole, foldable laterally. The present invention relates to a shoe having wheels incorporated in the sole and laterally unfoldable by means of a mechanism. This shoe can be used alternately for walking and driving.

The present invention relates more particularly to shoes which comprise one to four wheels, placed for walking horizontally in housing of the sole, and which for rolling, can be pivotally rotated about a longitudinal axis and locked in substantially vertical position projecting downward on each side of the sole and thus transforming the shoe roller skate.

In everyday life, we pass successively through places and moments where we must be able to walk easily, and others where it is interesting to be able to ride in good conditions, without having to change equipment or to transport accessories.

It is therefore useful to have shoes aesthetic and practical, but also versatile and to switch easily from one mode of use to another.

We know the shoes according to WO 01/85271 A1 which can be transformed into rollers but which are relatively heavy and complex. Due to the in-line layout of the wheels, these shoes must rise above the ankle to protect and maintain the foot. It is not easy to walk with this type of shoes, whose sole is also made rigid by the mechanism. The shoes according to CN 2306039 Y are also known. The soleplate is relatively rigid because of the metal plate and can not be deformed freely during walking. The mechanism under the soleplate can become dirty and the overall weight is relatively high.

The object of the invention is to provide transformable shoes, light but robust, with a thin and flexible sole that can deform freely during walking, with large diameter wheels and a single and simple control device. The invention can adapt to any type of shoes, with or without ankle support. The roller shoes according to the invention make it possible to move very quickly and easily from walking to rolling, and vice versa and they are ideal for both uses.

It is in particular possible to choose according to the intended use, the diameter and the width of the wheels, their spacing and their position relative to the heel, the height of the soleplate with respect to the ground in the rolling position, the fixing mechanism and the wheel lock, etc. Preferably, the soleplate equipped with the rollers presents to the ground only closed surfaces coated with rubber offering only a low risk of fouling.

The mechanism according to the invention, used to attach the casters to the boot, allows effective and safe locking of the casters in the rolling position and in the running position, without play or vibration, and a quick passage, without effort and without tools. one position to another.

To solve this technical problem, the invention teaches a versatile shoe intended alternately for walking or driving, comprising a sole in which are provided housing; casters, which for walking are retracted in a horizontal position in the housing of the sole and for rolling are deployed under the sole in vertical position; and a mechanism for actuating the rollers for moving the rollers alternately from one position to the other by lateral pivoting.

According to the invention, in the vertical rolling position, the rollers are disposed on either side of the sole in the manner of a roller skate.

In addition, the mechanism for actuating the rollers comprises:

- Two longitudinal axes each arranged on one side of the shoe and attached to the sole by means of bearings allowing them to pivot on themselves, these longitudinal axes bearing firmly in rotation the rollers on the same side of the shoe;

two rotating elements placed at the rear of the shoe, each being integral in rotation with one of the longitudinal axes and being capable of pivoting between two limit positions corresponding to the horizontal running position of the wheels and for the other at the vertical rolling position of the rollers;

- An angular locking device of the rotating elements, which when unlocked releases the rotating elements and allows their free rotation under the effect of weight or a force exerted on the rollers, longitudinal axes or rotating elements and which when locked simultaneously blocks the rotating elements in one of their limit positions.

Other features and advantages of the invention will appear on reading the detailed description which will follow. The equivalent elements represented in the different figures will bear the same numerical references.

The description will be made with reference to the accompanying drawings, which show a preferred embodiment of the invention in the form of a shoe equipped with four wheels, and in which:

. Figure 1 is a perspective view of the shoe, on the inside, with the rollers positioned horizontally for walking.

. Figure 2 is a perspective view of the shoe, on the inside, with the rollers positioned vertically for rolling.

. Figure 3 is a top view without the sole and without the shoe. Inner side 13, the rollers are in a horizontal position for walking. Outside side 14, the wheels are in a vertical position for rolling.

For simplicity, the locking mechanism has not been fully represented in FIGS. 1, 2 and 3.

. Figure 4 is a perspective view of the rear and inner side of the locking mechanism according to a first variant of the invention. For simplicity, not all components of the mechanism have been represented.

. Figure 5 is a cross section through the sole and the wheel 7, in a horizontal position.

. Figure 6 is a section through the locking mechanism according to a second variant of the invention.

. Figure 7 is a rear view of the locking mechanism according to a third variant of the invention. . Figure 8 is a rear view of the locking mechanism. The left side corresponds to a fourth and the right side to a fifth variant of the invention.

. FIG. 9 is a sectional view, taken along the sectional plane IX-IX of FIG. 8, showing details of the mechanism according to the fourth and fifth variants of the invention,

. FIG. 10 is a schematic simplified schematic view of a variant with steerable wheels,

. Figure 11 is a simplified schematic mixed view in longitudinal section of the variant with adjustable castors.

A versatile shoe 1 according to the invention will now be described in detail with reference to the figures.

The shoe 1 comprises a sole 2 in the outer edge of which are formed housing 3, 4, 5 and 6, each for receiving a wheel 7, 8, 9 or 10. The example shown in the figures relates to a fitted shoe four casters, two of which referenced 7 and 8 are placed on the inner side 13 of the shoe 1 and two casters 9 and 10 are placed on the outer side 14 of the boot 1. But other variations on the number or disposition of the casters are possible. One can imagine for example a shoe with an inner roller and two outer casters, or 1 reverse.

According to the invention, longitudinal axes 15 and 16, placed one on each side of the boot and preferably above or above the sole 2, support the rollers located on the same side, that is to say respectively 7, 8 for the axis 15 and 9, 10 for the axis 16 in the example shown, through their respective hubs 21, 23, 25 and 26. The axes 15 and 16 are in the form of bars whose general orientation is longitudinal with respect to the boot and preferably generally parallel to the outer and inner edges of the boot 1.

The longitudinal axes 15 and 16 can pivot on themselves and drive with them the rotation of the wheels that they support. The connection in rotation between the hubs 21, 23, 25, 26 and the axes 15, 16 is made by grooves, striations, keys or any other known means.

The axes 15 and 16 are guided in rotation at the rear 12 by bearings 18 and 20 which are preferably connected to a rear plate 60 integral with the sole 2. This rear plate 60 can be attached to the sole 2 or be directly integrated into it. It comprises a substantially vertical wing 27 disposed at the rear edge of the sole 2 and preferably a substantially horizontal wing 43 disposed under the sole 2 in its rear portion.

The axes 15 and 16 are guided at the front 11 by bearings 17 and 19, preferably also connected to a plate 28 integral with the sole 2 and disposed under the sole 2 in its front portion.

The bearings 17, 18, 19 and 20 preferably each comprise a ball joint so as to allow the angular displacement of the pins 15 and 16 relative to the bearings 17, 18 and 19, respectively. These ball joints can be replaced by flexible links between the bearings 17, 19 and the plate 28 and between the bearings 18, 20 and the plate 60. This angular movement of the axes 15, 16 advantageously provides great flexibility to the sole and allows it to free deformed when walking, without exercising constraints on the axes and their bearings. Thus the rotation of the axes 15 and 16 simultaneously tilts the casters which are integral therewith, and the ball bearings 17, 18, 19, 20 guarantee a good operation regardless of the deformation of the sole 2.

Since the shoe is conventionally wider at the front than at the rear, the axes 15 and 16 are generally wider at the front than at the rear, as shown in FIG. the connections between the rims 22 and the hubs 21, 23, 25, 26 are made so that the rollers are parallel to each other, and parallel to the front / rear direction 11-12 when in the vertical rolling position. To compensate for this difference in parallelism between the rollers 7, 8 and 9, 10 and the axes 15 and 16, the caster housings preferably have a bottom 59 inclined relative to the ground 41 and to the sole 2.

The plate 60 is preferably made in one piece. The plate 28 may also be integral or consist of two independent elements right and left, separately attached to the sole.

The plates 60 and 28 are made for example of pressed sheet metal, molded metal or injected plastic, and overmolded during the production of the sole 2. They can also be integrated with the sole 2, that is to say , molded in one piece with the sole in a suitable plastic material.

Figures 1 and 2 show the substantially vertical portion called wing 27 of the rear plate 60. This vertical portion is located in an area of the boot 1 which is protected from impacts and contact with the ground 41. It can advantageously serve as a support to the angular blocking device rotating sets.

Rotating elements 30 and 31 are integral in rotation respectively with the axes 15 and 16. The rotational connection can be made by any known means, such as streaks, splines, keys, pins, etc. According to the first variant of the invention, each rotating element 30 or 31 is of substantially elongate shape. It is directed upwards when the rollers 7, 8, 9, 10 are in a horizontal position as shown in FIG. 1. It is located substantially horizontally when the rollers are in the vertical rolling position (FIG. 2). . In this horizontal position, each rotating element 30, 31 abuts against an abutment element 34 preferably integral with the wing 27.

Figure 4 shows a first preferred variant of the angular locking device, with the inner side 13 the rolling position, and the outer side 14 the running position. A latch 33 is articulated at its base, via a hub 53 which is secured thereto, about an axis 54 connected to the plate 60. The latch 33 is pressed against the flange 27 by a spring 36. represented on this view. The lock 33 comprises on each side a lateral bearing surface, respectively 56 and 44, substantially vertical coming to bear against one of the rotating elements 31 or 30. The latch 33 also comprises on each side a lower bearing surface , respectively 55 and 58, for blocking each of the rotating elements 31, 30 in horizontal position.

Other angular positions of the rotating elements 30, 31 are possible according to the invention, provided that the difference between the running position and that of rolling is substantially equal to 90 °.

According to a preferred embodiment of the invention, the bearing surfaces 56, 55, 44 and 58 of the lock 33 and the corresponding edges of the rotating elements 30, 31 may comprise chamfers or spokes intended to facilitate the engagement of the lock 33 in each of the positions and to delete the games.

Figure 3 shows that according to a preferred embodiment of the invention the front rollers 7 and 10 are located at least partially at the rear of the line 40 which is the bending line of the sole 2. When walking, the sole remains substantially flat at the rear of this line, while the portion of the sole located at the front of this line 40 undergoes significant bending.

The rollers 7 and 10 located under the front part of the sole 2 will be slightly spaced from each other, to be able to leave in the sole 2 an intact central zone 32, between the housings 3, 5 intended for the front rollers 7, 10, which connects the deformable zone of the sole 2 located at the front of the bending line 40 of the shoe 1 to the rear zone of the sole 2, which may be more rigid, located at the rear of this flexion line 40. This zone 32 is intended to give the sole 2 a homogeneous bending behavior, and to compensate for the weakening caused by the housings 3 and 5 of the rollers 7 and 10. This central zone 32 will also support a portion of the weight of the user, when walking.

To allow the use of large diameter wheels, it is possible to superimpose them partially. This arrangement may be advantageous for the rear wheels 8, 9 located under the heel which is narrower than the front of the sole. Thus, at least two of the casters can be placed partially one above the other in horizontal walking position. Figure 5 shows a section through the roller 7 in the horizontal position. The rollers 7, 8, 9, 10 preferably have a hollow rim 22. According to a preferred embodiment of the invention, a sole member 39 integral with the sole 2 and preferably substantially cylindrical, may advantageously pass through the rim 22 of the wheel 7 and bear on the ground 41 when the wheels are in position horizontal walk.

In this way the presence of the rollers reduces only slightly the contact surface of the sole with the ground.

Each wheel preferably comprises a tread 42 and a cheek 38 directed towards the ground and intended to protect the wheel. These elements 42 and 38 are for example made of an elastic material of the rubber or polyurethane type.

Each rim 22 is secured to the hub 21, 23, 25 or 26 of the wheel concerned. In FIG. 5, the rim 22 is integrally connected to the hub 21.

Preferably, the cheek 38 of each wheel is elevated relative to the ground when the rollers are in a horizontal position. Thus the casters and the mechanism that supports them do not undergo efforts during normal walking but only occasional efforts for example on sandy soil.

FIG. 6 shows a second variant of the angular locking device of the rotating elements 30, 31. The lock 33 is pushed towards the flange 27 of the plate 60 by the spring 36. According to the invention, the lock 33 comprises a blade spring 24 which is attached to it. This leaf spring 24 has a free position 24 'shown in dashed lines. Under the action of the spring 36, the spring blade 24 is compressed and its end 37 pushes the rotating member 30 in a vertical position. The position of the end 37 of the leaf spring 24 is defined so that the wheel 7 is pressed against the bottom 59 of the housing of the sole 2. In this way, thanks to the elastic thrust of the leaf spring 24, the games are eliminated and the casters 7, 8, 9, 10 are elastically pressed against the bottom of their respective housing in a horizontal position, which avoids noises and clicks during walking or running.

Advantageously, a flexible envelope (not shown) can cover the angular locking device comprising in this case the lock 33 as well as its hinge 53 and hub 54 and its spring 36. It can also cover one or more other elements such as the plate 60 , the rotating elements 30, 31, the longitudinal axes 15, 16 and / or the bearings 17, 18, 19, 20. This envelope allows movement of the movable elements and the lock 33, but protects the assembly against dirt and grease. shocks.

All the characteristics that have just been described allows the sole equipped to deform freely in flexion and torsion during walking without these deformations cause constraints on the mechanical components. On the other hand, the mechanical components such as the axes 15, 16, the bearings 17, 18, 19, 20, the rotating elements 30, 31, 45, 49 and the angular locking device 33, 47, 50, 52 are placed above the wheels 7, 8, 9, 10 and at the top of the sole 2, and the wheels do not touch the ground 41 in normal condition. Thus there is no risk of wear or dirt.

These features are a significant improvement over art prior.

FIG. 5 shows that the center of gravity of the wheel 7 is offset with respect to the longitudinal axis 15. Thus, according to the invention, when the angular locking device has been unlocked, for example by action on the lock 33 which releases the rotating elements 30 and 31, the longitudinal axes 15 and 16 are rotated by the off-axis weight of the rollers 7, 8, 9, 10. Such a pivoting could also be caused by an elastic element acting on the rotating elements, the longitudinal axes or casters. Casters 7, 8, 9 and 10 are then found, by gravity or elastic effect, in an intermediate position. The angle of inclination of the rollers in this intermediate position is between the vertical and the horizontal.

In this intermediate position, a vertical push of the shoe 1 on the wheels

7, 8, 9, 10 will cause a plating thereof under the sole 2 in the horizontal operating position, then an automatic locking of the angular locking device under the action of the spring 36 and the latch 33. Conversely, a lateral friction a roulette wheel 7,

8, 9 or 10 towards the outside of the shoe will cause a rotation of the corresponding rotating assembly in the vertical rolling position and an automatic locking of the angular locking device in this position.

In the case where one would like to obtain an inclination of the wheels, different from that obtained by simple gravity, it is possible to place springs for example between the longitudinal axes 15, 16 and the fixed plates. These springs will cause the rotating assemblies in their equilibrium position corresponding to the desired angular position. Figure 7 shows a third variant of the angular locking device of the rotating elements, seen from the rear. On the left side there is shown the device blocking the rollers 9, 10 in the horizontal position. Right side, the device locks the casters 7, 8 in the vertical position. Each rotating element 45 has substantially the shape of a quarter disc centered on the longitudinal axis 15 or 16 corresponding and integral thereof. A spring 47, preferably double and symmetrical, integral with the flange 27 of the plate 60 abuts radial surfaces of the rotating member 45 to block the rotation. The rotating element 45 is limited in rotation in the other direction by a pin 46 secured to the flange 27. Thus it is sufficient to press down on the spring 47, more precisely on its two symmetrical branches, to release the rotation of the rotating assemblies and rotate the rollers 7, 8, 9 and 10 in the intermediate position.

This support can be performed by means of several rods or cables such as 48, preferably actuated by a common button to act simultaneously on each of the springs 47.

In general and whatever the nature of the angular locking device, the multipurpose shoe according to the invention preferably comprises a lever or a single actuating button which allows to unlock the angular locking device.

This lever or actuation button can be operated manually, for example by typing against a sidewalk or preferably by pressing a specially equipped area of the other shoe.

If necessary, the double and symmetrical spring 47 can be replaced by levers articulated in the center of the wing 27 and pushed against the rotating elements 45 by springs.

FIG. 8 shows two other technical solutions making it possible to produce an angular locking device for the rotating elements:

- Left side, according to a fourth embodiment of the invention, the rotating member 31 has a substantially elongate shape. It is locked in position by a disc 52 guided in translation in the flange 27 of the plate 60 by means of a guide element 51 visible in FIG. 9.

By sliding the disk 52 upwards, the rotation of the rotating element is released. A not shown spring automatically pushes the disc 52 to the locked position. The locking disk 52 may have a chamfered edge to facilitate engagement or substantially conical shape in order to eliminate the clearance between the wheels and the bottom 59 of the housing of the sole.

- Right side, Figure 8 shows a fifth variant of the invention wherein the rotating member 49 has substantially the shape of a quarter disc. A locking element 50, guided in horizontal translation on the flange 27 of the plate 60, is pushed by a spring against the rotating element 49.

By sliding the right and left blocking elements 50 horizontally towards the middle of the wing 27, the rotation of each rotary assembly is released. The rotating elements 49 each have a lug 57 which limits the rotation of the rotating assemblies as soon as the vertical position of the rollers 7, 8, 9, 10 is reached, bearing against the corresponding blocking element 50.

In Figure 3, the longitudinal axes 15 and 16 are shown straight. According to a variant of the invention, the central portion of these axes, located between the bearings 17, 19 and the hubs 23, 26, can follow the curvature of the sole. In this way the axes 15 and 16 are close to the sole 2 and can be supported under it.

It is also possible, to improve the flexibility of the fitted sole, to place joints such as universal joints on the pins 15 and 16, near the bearings 17, 19 and the hubs 23, 26.

To improve safety, we can add an additional lock that locks the casters 7, 8, 9, 10 in the horizontal position. This locking can consist of locks, actuated simultaneously by the lock 33 or by a separate lever, and which act for example directly on the rims 22.

Figures 10 and 11 illustrate a variant with rotatable castors couples in turns. The aim is to obtain oblique geometric axle lines and if possible at least for one of them and in particular the geometric axle before being radiating or approximately radiating, that is to say say in the extension or approximately in the extension of a radius of the turn circle or the average circle of turn.

The wheels are thus oriented correctly during the turn. In this way wear is limited and the balance of the wearer is improved in the curves.

In the variant shown in Figures 10 and 11, the inclination of the sole 2 causes the correct orientation of the two pairs of pairs of casters torque and any variation in inclination corresponds to a variation of orientation of the pairs of wheels or to less than a couple of wheels. The curving becomes more comfortable and safer.

We can make orientable only one pair of wheels, preferably the front couple.

To do this, we add a device for pivoting the front plates 28 and rear 60 or only one of them. These plates becoming mobile 28 and 60 or only one of them, are or is connected (s) kinematically to the sole 2 by an axis inclined at approximately 45 ° respectively to 1 'front for the rear inclined axis 61 and towards the rear for the inclined axis before 62. The connection is purely functional. It can be a simple push. These axes are carried respectively by a fixed rear plate 63 and a fixed front plate 64. These inclined axes are located in the median plane of the sole 2 as visible in Figures 10 and 11.

The inclined axes 61 and 62 each carry at the end a bearing member 65 and 66 acting by rotating on itself and being in contact with the corresponding pivoting plate to rotate in the desired direction that is to say that determined by the inclination of the sole 2, resulting for each inclined axis simultaneous pivoting of the two wheels of the same pair of wheels.

Thus, when one inclines the foot and thus the sole 2, each plate is driven in motion for example by pivoting about its own axis by the effect of the piece of land of the corresponding inclined axis.

The turntables 28 and 60 are then no longer parallel to each other but their front and rear edges are directed towards the center of the turn and the shoe inclined to the right or left will automatically describe a turn in the same direction. Due to the orientation of the casters of the same pair of casters in the manner of a pivoting axle for each pair of casters, the distances between the front and rear casters become variable and it is necessary to provide a freedom of movement by longitudinal axes 15 and 16 of variable length for example extensible. By way of example, a system of grooves can be cited which provides torsional stiffness while allowing the bearings of the rollers on the same rolling line to move closer or further away.

In addition, to allow angular deflections caused by the pivoting of the rear plates 60 and before 28, the ends of the axes 15 and 16 are articulated, preferably by a multidirectional hinge.

An example of extensible axes is illustrated in FIG. 10 on which telescopic axes 15 and 16 made in two parts 67, 68 and 69, 70 can be seen and at their ends articulated joints of the cardan type 71, 72 to the rear and 73, 74 at the front.

As these angular deflections may be limited, it is possible to envisage, from the technological point of view, a gimbal equivalent by elastic deformation of two parts or by deformation of intermediates or interleaves providing a flexible connection.

Obviously, the invention is not limited to the preferred embodiments described above and shown in the various figures, the skilled person can make many modifications and imagine other variants without departing from the scope and of the scope of the invention defined by the claims.

Claims

1. Multipurpose shoe (1) intended alternately for walking or driving, comprising a sole (2) in which are formed housing (3 4, 5, 6), wheels (7, 8, 9, 10) which for the step are retracted in a horizontal position in the recesses (3, 4, 5, 6) of the sole (2) and for rolling are deployed under the sole (2) in the vertical position, and a mechanism for actuating the wheels allowing passing the rollers (7, 8, 9, 10) alternately from one position to the other by lateral pivoting, characterized

in that, in vertical running position, the rollers (7, 8, 9, 10) are arranged on either side of the sole (2) in the manner of a roller skate; and

in that the mechanism for actuating the rollers comprises:

- two longitudinal axes (15, 16) each disposed on one side of the shoe (1) and fixed to the sole (2) by means of bearings (17, 18, 19, 20) allowing them to pivot on them likewise, these longitudinal axes bearing in rotation the rollers (7, 8, 9, 10) situated on the same side of the boot (1);

two rotating elements (30, 31, 45, 49) placed at the rear of the shoe (1), each being integral in rotation with one of the longitudinal axes

(15, 16) and being capable of pivoting between two limit positions corresponding for one to the horizontal running position of the rollers (7, 8, 9, 10) and for the other to the vertical rolling position of the rollers ( 7, 8, 9, 10); - An angular locking device of the rotating elements (33, 47, 50, 52), which when unlocked releases the rotating elements (30, 31, 45, 49) and allows their free rotation under the effect of weight or an effort exerted on the wheels

(7, 8, 9, 10), the longitudinal axes (15, 16) or the rotating elements (30, 31, 45, 49), and which when locked simultaneously locks the rotating elements (30, 31, 45). , 49) in one of their limit positions.

2. Multipurpose shoe (1) according to the preceding claim, characterized in that the bearings (17, 18, 19, 20) are ball bearings or flexible connection.

3. Multipurpose shoe (1) according to any one of the preceding claims, characterized in that the longitudinal axes (15, 16), the bearings (17, 18, 19, 20), the rotating elements (30, 31, 45 , 49) and the angular locking device (33, 47, 50, 52) are placed above the rollers (7, 8, 9, 10) and at the top of the sole (2).

4. Multipurpose shoe (1) according to any one of the preceding claims, characterized in that it comprises a rear plate (60) attached to or integrated with the sole (2), which comprises a substantially vertical wing (27) arranged at the rear edge of the sole (2) and serving as support for the angular locking device (33, 47, 50, 52).

5. Multipurpose shoe (1) according to any one of the preceding claims, characterized in that the rollers (7, 8, 9, 10) comprise a cheek (38) and a hollow rim (22); and in that when the rollers (7, 8, 9, 10) are in the horizontal operating position, the hollow rims (22) are traversed by a sole member (39) for supporting the ground and the cheeks (38) are raised relative to the ground (41).

6. Multipurpose shoe (1) according to any one of the preceding claims, characterized in that it comprises an elastic means (24) which allows to press elastically under the rollers (7, 8, 9, 10) against the bottom (59) of their respective housing (3, 4, 5, 6) in horizontal walking position.

7. Multipurpose shoe (1) according to any one of the preceding claims, characterized in that the sole (2) comprises between the housings (3, 5) for the front rollers (7, 10) an intact central area (32). which connects the deformable zone of the sole (2) located at the front of the bending line (40) of the shoe (1) to the rear zone of the sole (2) situated at the rear of this flexion line (40) and which supports a portion of the weight of the user when walking; and in that the front rollers (7, 10) are placed at least partially behind this bending line (40).

8. versatile shoe (1) according to any one of the preceding claims, characterized in that it comprises a single lever or actuating button which allows to unlock the angular locking device (33, 47, 50, 52).

9. Multipurpose shoe (1) according to any one of the preceding claims, characterized in that, when the angular locking device (33, 47, 50, 52) is unlocked, the rollers (7, 8, 9, 10) are driven into an intermediate position by their own weight or by a elastic element; and in that a vertical thrust on the rollers (7, 8, 9, 10) or a lateral friction of the rollers (7, 8, 9, 10) towards the outside of the shoe (1) causes the casters to pass (7, 8, 9, 10) respectively in the horizontal operating position or in the vertical rolling position and the automatic locking of the angular locking device (33, 47, 50, 52).

10. versatile shoe (1) according to any one of the preceding claims, characterized in that it comprises a flexible envelope which covers at least one of the following elements: the rotating elements (30, 31, 45, 49), the device angular locking (33, 47, 50, 52), the longitudinal axes (15, 16), the bearings (17, 18, 19, 20), to protect them from dirt and shocks.

11. Shoe according to claim 1 characterized in that it comprises at least a pair of steerable wheels according to the inclination of the sole (2).

12. Shoe according to the preceding claim characterized in that the pair of steerable wheels is the front torque.

Shoe according to claim 11 or 12, characterized in that:

. at least one of the plates (60) or (28) is pivotable,

at least one rear fixed platen (63) and / or front (64) is provided integral with the sole (2) in the median region of the area or the pairs of wheels,

. on each fixed plate (63) and (64) is mounted an inclined axis, namely a rear inclined axis (61) inclined towards the front, and a forward inclined axis (62) inclined towards the rear,

. each inclined axis (61) and (62) cooperates with the corresponding movable plate in order to orient the rollers,

the connecting pins (15) and (16) are extensible,

the connecting pins (15) and (16) are connected to the corresponding hubs by multidirectional joints.

14. Shoe according to claim 13 characterized in that the inclined axis or axes (61),

(62) is or are inclined substantially at 45 °.

15. Shoe according to claim 13 characterized in that the extensible connecting pins (15) and (16) are telescopic.

16. Shoe according to claim 13 characterized in that the multidirectional joints connecting the shafts (15) and (16) to the hubs of the rollers are of the cardan type.

17. Shoe according to claim 13 characterized in that only the front plate (28) is pivotable and that there is only one axis inclined at the front.