WO2003097188A1

WO2003097188A1 - Roller skate

Info

Publication number: WO2003097188A1
Application number: PCT/JP2003/005815
Authority: WO
Inventors: Mitetsu Sano
Original assignee: Mitetsu Sano
Priority date: 2002-05-15
Filing date: 2003-05-09
Publication date: 2003-11-27
Also published as: JP3732156B2; EP1541202A1; US20060038361A1; JP2003325725A; EP1541202A4; AU2003235914A1

Abstract

Roller skates (1) comprise a pair of shoes (3) having a shoe main body (7) and a sole (9), a roller section (5) disposed on each shoe, the roller section (5) having an axle (17) obliquely downwardly extending inwardly of the shoe main body (7), and a wheel (51) rotatably mounted on the axle (17). The diameter of the wheel (51) is greater than the distance between the sole (9) and the ground, and the wheel (51) is obliquely installed to extend from the inside of the shoe main body (7) to below the sole (9) so that the point at which the wheel contacts the ground is substantially in the middle of the sole (9).

Description

Specification

Roller skates Technical field

The present invention relates to mouth-to-mouth skating. Background art

Conventional roller skates have a structure in which a plurality of rollers are arranged in a plane on a shoe sole and fixed to the sole of a running shoe. On the other hand, in recent years, an inline schedule in which a plurality of rollers are arranged in a line in the front-back direction of a shoe sole has become mainstream.

In open-mouth skating, including all-in-line skating, all mouth skates are located below the soles of the shoes, and the roller diameter must be much larger to emphasize stability. Can not. Therefore, there is a limit to the speed, and there are certain limits to how to play with it. Disclosure of the invention

An object of the present invention is to provide a roller skate which has a completely different structure from a roller skate which has existed conventionally, and has a larger wheel than the conventional roller skate.

In order to achieve the above object, a roller skate according to a first aspect of the present invention includes a pair of shoes having a use body portion and a shoe sole portion, and a mouth portion provided on each shoe. The roller portion includes an axle portion that extends obliquely below the inside of the shoe body portion, and front and rear wheels rotatably provided on the axle portion. The diameter of the wheel is between the shoe sole portion and the ground. The wheel is provided obliquely from inside the shoe body to below the shoe sole so that the ground contact point of the wheel is larger than the distance and the ground point of the wheel is substantially at the center of the shoe sole. According to the first aspect, since wheels having a larger diameter can be employed as compared with the conventional mouth-to-mouth skate, roller-skate can be enjoyed at a high speed. In addition, since the wheels are installed diagonally, you can experience a softer sliding feeling than conventional roller skates.

Further, according to a second aspect of the present invention, in the first aspect, the wheel has a bowl-shaped or mortar-shaped shape in which the case body portion side is formed in a concave shape and the opposite side is formed in a convex shape. It is characterized by having a shape. According to the second aspect, the wheel can be attached so as to cover the portion protruding inside the shoe body, so that the ground contact portion of the wheel is positioned near the center of the shoe sole without tilting the wheel too much. It becomes possible.

Further, according to a third aspect of the present invention, in the first aspect or the second aspect, the roller unit includes a frame fixed from the shoe body to the shoe sole, and an axle provided on the frame. A fixed portion, wherein the axle portion is formed so as to protrude from the fixed portion with the axle, the axle portion has a screw hole formed with an internal thread on an inner peripheral surface, and a male screw is formed on an outer peripheral surface. A hub bracket is provided around the axle, and a plurality of poles roll between a bearing surface formed on the fixed portion with axle and a bearing surface formed on the hub bracket. Around the axle portion, a pole holding bracket is provided so as to overlap with the hub bracket and is screwed to a male screw on an outer peripheral surface of the axle section, on a side opposite to a bearing surface of the hub bracket. Other formed A plurality of pawls are rotatably arranged between a bearing surface and a bearing surface formed on the pole holding bracket, and a metal fixing screw is screwed into a female screw of the screw hole of the axle part, The ball holding bracket is prevented from being detached, and the wheel is fixed to the bracket.

According to the third aspect, the hub fitting can rotate by the pole bearing action, and accordingly, the wheels can rotate.

Further, according to a fourth aspect of the present invention, in the third aspect, the fitting fixing screw is provided. Is characterized in that a metal fitting contact portion is formed, and the metal fitting contact portion is in contact with an end face of the ball holding metal to prevent the ball holding metal from being detached. According to the fourth aspect, during the process of screwing the metal fitting fixing screw into the screw hole of the axle, the metal fitting contact portion abuts on the end face of the pole holding metal to prevent the ball holding metal from being detached. You.

Further, according to a fifth aspect of the present invention, in the third aspect, a plurality of slits are formed on an outer end side of the screw hole of the axle portion to form an expandable end, The screw-in hole is provided with a screw portion and an enlarged-diameter portion formed on the opposite end side of the screw portion and gradually becoming thicker toward the end portion. It is assumed that

According to the third aspect, in the process of the screw being screwed into the screw hole, the extended end gradually expands outward, and the male screw formed on the outer surface of the axle portion is formed on the inner surface of the ball holding bracket. It becomes strongly locked to the formed female screw, so that the screwed state between the axle and the ball holding metal can be kept constant.

In a sixth aspect of the present invention, in any one of the third to fifth aspects, the axle-mounted fixing portion is separately attached to the frame corresponding to front and rear wheels. One or both of the front and rear axle-mounted fixing portions are slidable in the front-rear direction so that the distance between the front and rear axle-mounted fixing portions can be changed.

According to the sixth aspect, the distance between the front and rear wheels can be changed by moving one or both of the front and rear fixed portions with axles in the front and rear direction. Therefore, it is possible to appropriately change the distance between the wheels according to the size of the case and the sliding comfort of the user. Further, according to a seventh aspect of the present invention, in any one of the third to sixth aspects, the axle-attached fixing portions are separately attached to the frame corresponding to front and rear wheels, respectively. One or both of the front and rear fixed parts with axles can be angled to the frame so that the direction of the wheels with respect to the running direction of one skate can be finely adjusted. It is characterized by being attached to.

According to the seventh aspect, the angle of the wheel with respect to the traveling direction of the roller skate can be finely adjusted by slightly changing the angle of the fixed portion with the axle. This makes it possible to fine-tune the straight-line uncertainty due to the oblique wheels provided from the inside of the shoe body to the bottom of the shoe sole, and to adjust to the sliding comfort of the user. Of the wheels can be adjusted.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the direction in which the bracket is rotated when the roller skate advances forward is the threaded engagement of the ball holding bracket. It is characterized by the direction of release. According to the eighth aspect, it is possible to prevent the pawl holding member from being screwed in while the roller skating is in progress and the pole is pressed more than necessary and locked. According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the direction in which the bracket is rotated when the roller skate advances forward is determined by a screw in which the bracket fixing screw is screwed. It is characterized in that it is screwed deeper into the hole. ADVANTAGE OF THE INVENTION According to this invention, since a metal fitting fixing screw is screwed so that it may be tightened further while a roller skate is in progress, it is possible to avoid the possibility that the metal fixing screw is accidentally detached and the pole holding metal is detached. be able to.

In a tenth aspect of the present invention, in any one of the first to ninth aspects, the inclination of the wheel is from 10 ° to 35 °. is there. If the inclination of the wheels is between 10 ° and 23 °, the center of gravity will be higher because the wheels are tilted so as to be relatively vertical, but it will be easier to increase the speed, so it will be easier for the roller-skate for competition. This is the optimal angle. If the inclination of the wheel is between 23 ° and 35 °, the wheel is tilted so that it is relatively horizontal, so it has good stability and is the optimal angle for the general mouth-to-mouth scale. .

According to a eleventh aspect of the present invention, in any one of the first to tenth aspects, a tire is detachably or non-removably fixedly mounted on an outer peripheral portion of the wheel. It is characterized by having been done.

According to the eleventh aspect, by mounting a tire on the outer peripheral portion of the wheel, the contact friction with a running road surface such as the ground increases, the drip property increases, and the impact due to small unevenness or the like increases. Absorbs water and can slide smoothly. In addition, tires that are configured to be detachable by using attachment / detachment brackets or the like can be replaced with tires adapted to the road surface condition according to the condition of the traveling road surface, and thus optimal running can be ensured. Furthermore, it is possible to provide a variety of choices in fashion, for example, by attaching colorful tires according to the user's preference.

According to a twelfth aspect of the present invention, in any one of the first to eleventh aspects, a reinforcing portion made of a relatively strong material is provided inside the shoe body. Are formed. According to the twelfth aspect, it is possible to prevent deformation of the shoe body and prevent the shoe body from rubbing due to the wheel contacting the shoe body when the roller rotates. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an exploded perspective view showing a roller portion of the roller skate (only for right foot) of the present invention.

FIG. 2 is a side view of the mouth skating skate (for right foot only) of the present invention. FIG. 3 is a plan view of the roller skate (for right foot only) of the present invention. FIG. 4 is a rear view of the roller skate of the present invention.

FIG. 5 is a cross-sectional view showing a roller portion of the roller skate of the present invention. FIG. 6 is a rear view showing an embodiment according to the present invention, in which a mounting bracket with an axle can be slidably attached to the front and rear of a frame.

FIG. 7 is a rear view of the frame according to the present invention.

FI G. 8 relates to the present invention. It is a rear view showing a form.

FIG. 9 is a cross-sectional view showing another embodiment of the present invention for fixing the pole holding bracket to the axle. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a roller portion of the mouth skating skating 1 according to the present invention. FIG. 2 and FIG. 3 are side views and a top view of the roller skating of the present invention, respectively. FIG. Note that the roller skate 1 of the present invention is composed of left and right feet for symmetry with each other, but FIG.:! To FIG.3 shows only the right foot for simplicity.

The roller skate 1 includes a shoe 3 and a roller section 5. The shoe 3 includes a shoe body 7 and a sole 9. These components are basically the same as those of the athletic shoe, and will not be described in detail here. Inside the shoe body 7 (on the left side for the right foot, on the right side for the left foot) is formed a reinforcing portion 11 made of a relatively rigid material. In addition to preventing the deformation of the shoe 7, the rotation of the roller 5 prevents the wheels described later from contacting the shoe body 7 and the shoe body 7 from being rubbed.

As shown in FIG. 5, the roller portion 5 is a metal (specifically, aluminum) frame whose cross section is bent to match the shape from the shoe body 7 to the shoe sole 9. In contrast to 13, a circular plate-shaped fixing bracket 15 with an axle is fixed, and a cylindrical axle section 17 stands up from the center of the fixing bracket 15 with an axle. A screw hole 19 in which a female screw is formed is formed inside the axle portion 17. A ring-shaped groove 21 is formed on the outer peripheral edge of the axle-mounted fixing bracket 15, and a concave bearing surface 23 is formed in the groove 21.

A hub fitting 25 is provided outside the axle 17. As shown in FI G. 5 A concavely curved bearing surface 27 is formed inside the hub bracket 25 and facing the groove 21 of the axle-mounted fixing bracket 15, and a concavely curved bearing is formed on the opposite side. Surface 28 is formed. A plurality of poles 29 are interposed between the bearing surface 23 of the axle mounting bracket 15 and the bearing surface 27 of the hub bracket 25, and the poles 29 are the bearing surfaces 2 of the hub bracket 25. By virtue of the presence of the restricting projection 31 formed in a ring shape on the outside of 7, it is held rotatably between the two bearing surfaces 23, 27.

The axle portion 17 is provided with a ball holding member 33 so as to overlap with the hub member 25. A sleeve 35 that penetrates the inside of the hub fitting 25 in a non-contact state is formed inside the ball holding fitting 33, and a female screw formed on the inner surface of the sleeve 35 is attached to the axle 17. Screwed into a male screw formed on the outer surface of the.

A concavely curved bearing surface 37 is formed in the pole holding bracket 33 at a position facing the bearing surface 28 of the hub bracket 25, and the bearing surface 37 and the bearing surface 28 of the hub bracket 25 are formed. Between them, a plurality of poles 39 are held in a rollable state.

Here, the screwing direction of the female screw of the sleeve 35 to the male screw of the axle 17 will be described. The screwing direction of the female screw of the sleeve 35 is such that the rotation direction of the hub bracket 25 when the roller skate 1 advances forward is the rotation direction of the screwing of the female screw of the sleeve 35, that is, The direction in which the ball holding bracket 33 moves away from the hub bracket 25 is set. By using such a screwing direction, it is possible to prevent the ball holding member 33 from being screwed while the roller scale 1 is in progress, and to prevent the ball 39 from being pressed more than necessary and locked. it can.

Further, a metal fixing screw 41 is provided outside the pole holding metal 33. The bracket fixing screw 41 has a substantially T-shaped cross section as shown in FIG. 5, and a screwing convex portion 43 having a male screw formed around the center is formed in the center. In addition, the peripheral edge of the bracket fixing screw 41 extends in the same direction as the threaded projection 43, and the end face of the ball holding bracket 33 is formed. A metal fitting abutment 45 is formed to prevent the ball holding metal 33 from coming off by abutting the metal 46. The male screw of the screwing projection 43 is screwed into the female screw of the screw hole 19 until the metal fitting contact part 45 comes into contact with the end face 46 of the ball holding metal 33, thereby holding the pole. The state where the bracket 33 and the hub bracket 25 are attached to the axle 17 is maintained.

The screwing direction of the male screw of the screwing projection 4 3 with the female screw of the screw-in hole 1 9 is determined by the direction in which the bracket 25 rotates when the roller gate 1 moves forward. Is the same as the direction of deep screwing. With such a screwing direction, the bracket fixing screw 41 is screwed so as to be further tightened while the roller skate 1 is in progress. It is possible to reliably avoid the possibility that the pole 41 comes off and the pole holding bracket 33 comes off.

A flange 47 is formed on the peripheral surface of the hub fitting 25, and a plurality of screw holes 49 formed with female threads are formed in the flange 47. The wheel 51 is provided so that the axle 17 is the center of rotation so that a part of the wheel 51 overlaps the flange 47. At the inner edge of the wheel 51, a through hole 53 is formed at a position corresponding to the screw hole 49 of the flange portion 47, and the screw hole 4 of the flange portion 47 is formed through the through hole 53. By screwing a screw 55 to 9, the wheel 51 is fixed to the hub bracket 25.

The wheel 51 has a bowl-like shape in which the side facing the shoe body 7 is formed in a concave shape, and the opposite side is formed in a convex shape. Instead of such a shape, a mortar-shaped shape in which the side facing the shoe main body 7 is curved in a relatively nearly straight shape may be adopted. Since the wheel 51 has a bowl-shaped or mortar-shaped shape, a portion protruding into the shoe body 7 (a portion corresponding to the arch as a recess and a portion most protruding forward inside from the recess is viewed as a recess). ) So that the wheel 5 1 can be attached so as to cover the wheel 5 without leaning the wheel 5 1 too much. It is possible to position the ground contact portion 1 near the center of the sole 9. In this case, the inclination a of the wheel 51 (see FIG. 4) can be changed for general use and competition use. For general use, 23 ° to 35 °, for competition use, Is preferably set to 10 ° to 23 °.

A rubber tire 57 is provided on an outer peripheral edge of the wheel 51. The tire 57 may be fixed to the wheel 51 by a plurality of screws 6 3 for holding the metal fittings 64, or may be formed integrally with the wheel 51. The contact point 6 1 (see FIG. 4) of the tire 57 is positioned near the center of the sole 9.

The roller skate 1 as described above can be used basically in the same manner as a conventional roller skate. That is, when the wearer of the roller skates 1 kicks the ground surface with one foot to apply forward propulsive force and grounds the other foot forward, the hub bracket 25 to which the wheel 51 is attached is attached. Rotates around the axle 17 between the ball 29 and the pole 39, and the tire 57 rotates while continuously changing its ground contact portion. This allows the wearer of the roller skates to move forward.

Next, another embodiment of the roller skate of the present invention will be described. In the embodiment shown in FIG. 6, separate fixing brackets 15 a and 15 b with axles are attached to the frame 13 corresponding to the front and rear wheels 51. Each bracket with axle 15a and 15b is formed with four long holes 65 extending long in the traveling direction of the roller skate, and corresponds to four long holes 65 on the frame 13 side Screw holes 67 are formed at positions (see Fig. 7).

In such an embodiment, as shown in FIG. 6, when the flanged screw 69 is screwed into the screw hole 67 of the frame 13 through the four long holes 65 and tightened, each axle The fixing brackets 15a and 15b can be positioned at arbitrary positions before and after in the traveling direction of the roller skates. Therefore, the distance between the front and rear wheels 51 can be changed by changing the distance between the mounting brackets 15a and 15b with axles. The distance between the front and rear wheels can be changed according to the size, and the appropriate wheel distance can be changed according to the sliding comfort of the user. As a modified example of this example, only one of the fixing brackets 15a and 15b with axles can be moved back and forth, and the other can be fixed to the frame 13.

In the embodiment shown in FIG. 8, similarly to the embodiment of FIG. 6, separate fixing brackets 15 a and 15 b with axles are attached to the frame 13 corresponding to the front and rear wheels 51. Have been. Each of the fixing brackets 15a and 15b with an axle in this example has a fulcrum hole 71 serving as a swing fulcrum and a direction which is disposed before and after the fulcrum hole 71 and is substantially perpendicular to the traveling direction of the roller skate. Two first guide slots 73 extending longer than the fulcrum holes 71 (the side where the little finger of the foot is located at the time of mounting), and the second guide slots 73 extending longer in an arc in the traveling direction of the roller skate. A guide slot 75 is formed. Also, on the frame 13 side, as in the embodiment of FIG. 6, the fulcrum hole 71, the two first guide slots 73 and the second guide slots 75 are located at positions corresponding to FIG. A screw hole 67 as shown in FIG. 7 is formed.

In such an embodiment, as shown in FIG. 8, a flanged screw 69 is inserted through a fulcrum hole 71, two first guide slots 73 and a second guide slot 75, respectively. It is screwed into the screw hole 67 of the frame 13. At this time, the axle mounting bracket 15a, 1 is rotated slightly around the fulcrum hole 71 clockwise or counterclockwise. 5 b can be fixed to frame 13. Therefore, fine adjustment can be performed by selectively inclining the directions of the front and rear wheels 51 by a predetermined angle with respect to the traveling direction of the roller skates. This makes it possible to correct the uncertainty of the straightness due to the oblique wheels provided from the inside of the shoe main body to the bottom of the shoe sole with fine adjustment, and it is possible to appropriately adjust to the user's sliding comfort. Of the wheels can be adjusted. Note that, in this example as well, only one of the axle-mounted fixing brackets 15a and 15b may be adjustable in angle, and the other may be fixed to the frame 13.

Next, FI G. 9 applies other measures to secure the pole holding bracket 33 to the axle 1 mm. The embodiment is shown. In this example, a screw hole 19 with a female screw is formed inside the axle portion 17, and a plurality of slits 79 are formed at the outer end side of the screw hole 19, so that the outside is formed. An extensible end 80 is formed which can be extended to Outside the axle 17, a pole holding bracket 33 with a sleeve 35 is screwed in the same manner as in the embodiment of FIG. A screw 81 is screwed into the screw hole 19. The potato screw 81 has a screw portion 83 and an enlarged portion 85 formed on the opposite end side of the screw portion 83 and gradually becoming thicker toward the end portion. A hexagonal hole 87 for engaging a hexagonal wrench is formed inside.

By screwing a potato screw 81 of this form into the screw hole 19 of the axle 17 using a hexagon wrench, the extended end 80 gradually expands outward, and the axle 17 The male screw formed on the surface strongly engages with the female screw formed on the inner surface of the ball holding member 33. In the description of the embodiment of FIG. 1, the relationship between the screwing direction of the female screw of the sleeve 35 and the traveling direction of the roller skate 1 has been described, but by adopting the configuration as in this example, In the case where the roller skate 1 runs backwards, which was not considered in the embodiment of FIG. 1 so much, the screwed state of the axle 17 and the ball holding bracket 33 must be kept constant. Therefore, the wheels 51 can rotate smoothly and stably. Industrial applicability

According to the present invention, it is possible to adopt a wheel having a diameter of about 14 cm, which cannot be considered with a conventional roller skate, so that it is possible to enjoy roller skating at a speed comparable to ice skating faster than before. . In addition, since the wheels are provided diagonally, you can experience a soft sliding feeling unlike conventional roller skates.

In addition, by forming the wheels into a bowl-shaped or mortar-shaped shape, the wheels can be attached so as to cover a portion protruding inside the shoe body, so that the wheels can be loosened. It is possible to position the ground contact portion of the wheel near the center of the shoe sole without tilting.

Furthermore, the roller-skate according to the present invention can be expected to have the following advanced uses.

Roller skates, as described above, are capable of running at the same speed as ice skating, which is different from flat rinks for ice skating. With a mortar-shaped link, it is possible to implement a dynamic speed competition that takes advantage of the height difference. In addition, this roller skating can run on only one heel or one toe, can run on a curved surface, and can slide like figure skating or ice dancing. In other words, a new type of skates can be born that has both the speed of ice skating and smooth running and the ease of roller skating. Therefore, it is thought that this roller skating has the power to revitalize society by creating new ways of playing and competition, like skateboarding.

Claims

The scope of the claims

1. A pair of shoes having a shoe body and a shoe sole, and a roller provided on each shoe, wherein the roller comprises an axle extending obliquely downward inside the shoe body, Front and rear wheels rotatably provided on the axle portion, the diameter of the wheels being greater than the distance between the sole and the ground, such that the ground point of the wheels is substantially at the center of the sole. Roller skates, characterized in that wheels are provided diagonally from the inside of the shoe body to the bottom of the shoe sole.

2. The mouth according to claim 1, wherein the wheel has a bowl-shaped or mortar-shaped shape in which the shoe body side is formed in a concave shape and the opposite side is formed in a convex shape. One skate.

3. In Claim 1 or 2, the roller portion is

A frame fixed from the shoe body to the shoe sole,

An axle-attached fixing portion provided on the frame,

The axle portion is formed to project from the axle-attached fixed portion,

The axle portion has a cylindrical shape with a screw hole formed with an internal thread on the inner peripheral surface, and a male screw formed on the outer peripheral surface,

A hub bracket is provided around the axle, and a plurality of pawls are rotatably disposed between a bearing surface formed on the axle-fixed portion and a bearing surface formed on the hub bracket.

Around the axle portion, a ball holding fitting is provided so as to be screwed onto a male screw on the outer peripheral surface of the axle portion so as to overlap the hub fitting, and another bearing formed on a side of the hub fitting opposite to a bearing surface. A plurality of poles are arranged so as to be able to roll between the surface and a bearing surface formed on the ball holding metal,

A metal fixing screw is screwed into the female screw of the screw hole of the axle portion to prevent the pole holding metal from being detached, A roller skeleton, wherein the wheel is fixed to the hub fitting.

4. In claim 3, a metal fitting contact portion is formed on the metal fitting fixing screw, and the metal fitting contact portion abuts on an end surface of the ball holding metal to prevent the pole holding metal from being detached. Roller skates characterized by being.

5. The axle portion according to claim 3, wherein a plurality of slits are formed at an outer end side of the screw hole of the axle portion to form an expandable expansion end. A roller skate, characterized in that it is provided with an enlarged-diameter portion that is formed on the opposite end side of the diaper portion and becomes gradually thicker toward the end portion, and that a screw can be screwed into the roller skate.

6. In any one of claims 3 to 5, wherein the fixed portions with axles are separately attached to the frame corresponding to front and rear wheels, and the distance between the fixed portions with front and rear axles can be changed. One or both of the front and rear axle-attached fixing portions are slidable forward and rearward so as to be able to operate.

7. The axle-mounted fixing portion according to any one of claims 3 to 6, wherein the fixed portion with the axle is separately attached to the frame corresponding to front and rear wheels, and finely adjusts the direction of the wheels with respect to the running direction of the roller skate. One or both of the front and rear axle-attached fixing portions are attached to the frame so as to be angle-changeable so that the angle can be changed.

8. The roller according to any one of claims 1 to 7, wherein the direction in which the hub bracket rotates when the roller skate advances forward is the direction in which the pawl holding bracket is unscrewed. One skating.

9. In any one of claims 1 to 8, a direction in which the hub bracket rotates when the roller skate advances forward is a direction in which the bracket fixing screw is screwed deeper into the screw-in hole. A roller skate characterized by the following.

10. The mouth skating skate according to any one of claims 1 to 9, wherein the inclination of the wheel is 10 ° to 35 °.

11. The roller-one skate according to any one of claims 1 to 10, wherein a tire is fixed to a peripheral portion of the wheel so as to be detachable or non-removable.

12. The roller-floor according to any one of claims 1 to 11, wherein a reinforcing portion made of a highly rigid material is formed inside the shoe body.