MECHANISM FOR EASY AND SAFE INSTALLATION, LOCKING AND REMOVING OF WHEELS ON FOOTWEAR

Abstract

Mechanism for easy and safe installation, locking and removal of the wheels on the footwear, belongs to the area of objects for personal use or leisure, characteristic in appearance and use. They can be used as roller skates and also for walking. The mechanism is installed in the supports, and consists of an elastic ball that is inserted into the holes made in the supports. The ball has the function of a spring. The sleeve is firmly tied in the holes of the support by means of a pin. The axle on which the wheels are slidably and rotatably mounted is inserted into the sleeve. With the help of the projection on the axles and the flat seat, under the action of the force from the elastic ball, the wheels are firmly and separable attached to the sole of the footwear.

Claims

1. Mechanism for easy and safe installation, locking and removal of wheels on footwear (1), consisting of wheels (4) with support (15) for the bearings (14) of the width (b), shoelaces (3) connected to the face (2) and the inner layer (5) which are firmly connected to the sole (6) into which a support (10) is inserted at one end, whose axes (10, 10) of the ends (10.1, 10.2) are made at a distance (x) from each other, and at the other end a support (20) is inserted whose ends (20.1, 20.2) are in the same axis (20), characterized in that a two-stage hole (10.1.1, 10.1) is drilled in the axis (10) of the end (10.1), wherein a two-stage hole (10.2.1, 10.2.2) is drilled in the axis (10) of the end (10.2), wherein a two-stage hole (20.1.1, 20.1.2) is drilled in the axis (20) of the end (20.1), wherein a two-stage hole (20.2.1, 20.2.2) drilled in the axis (20) of the end (20.2), wherein the holes (10.1.1, 10.2.1, 20.1.1, 20.2.1) of the diameter (d) are drilled at a depth (k1) from the ends (10.1, 10.2, 20.1, 20.2) of the supports (10, 20), wherein the holes (10.1.2, 10.2.2, 20.1.2, 20.2.2) of the diameter (d1) are drilled at the depth (k2) in the extension of the depth (k1), wherein at the bottom (10.3.1, 10.3.2, 20.3.1, 20.3.2) of the holes (10.1.2, 10.2.2, 20.1.2, 20.2.2) elastic balls (11) are inserted of the diameter (D), wherein in the holes (10.1.1, 10.2.1, 20.1.1, 20.2.1) of diameter (d), sleeves (12) of diameter (d) are inserted, wherein the sleeves (12) are firmly connected to the ends (10.1, 10.2, 20.1, 20.2) of the supports (10, 20) by means of pins (7) which are inserted into the openings (10.4.1, 10.4.2, 20.4.1, 20.4.2), drilled at a distance (k3) from the ends (10.1, 10.2, 20.1, 20.2) of the supports (10, 20), and into the semicircular groove (12.2) provided on the sleeve (12), wherein the axle (8) is inserted into the wheel (4) with the end (8.2) and rotatably and slidingly connected with the wheel (4), and wherein the axles (8) are inserted into the sleeves (12) with the end (8.2) and firmly and detachably connected with the sleeves (12).

2. Mechanism according to claim 1, wherein the axle (8) consists of a body (8.4) in which a steel pin (9) is firmly connected to one end (8.1) of the body (8.4) in the hole (8.3), wherein in the same hole (8.3) in the continuation of the pin (9) a plug (13) is firmly connected and wherein the flat circular surface (13.1) of the plug (13) is in the same plane as the end (8.1) of the body (8.4) of the axle (8).

3. The mechanism according to claim 1, wherein the body (8.4) of the axle (8) of length (f) is stepped on the outside, wherein at one end (8.1) of the body (8.4) in the axis of the body (8.4) the hole (8.3) of depth (f6) and diameter (d7) is drilled, wherein on the same side of the body (8.4) diameter (d8) of the body (8.4) of the length (f2) is the largest, wherein the central part of the body (8.4) of the diameter (d4) is smaller than the diameter (d8), wherein the body (8.4) has the diameter (d8) and length (f1), wherein the length (f1) of the body (8.4) is the greatest, wherein the body (8.4) of diameter (d4) after the length (f1), is reduced at an acute angle (p) to the diameter (d5) of the length (f4), wherein the diameter (d4) in the continuation of the length (f5) is reduced, and the reduction was made along the circumference of the body (8.4) covered by the angle (360)), the radius (r1), which has one common point (8.7) with the diameter (d4) on the half of the angle () and the tangents (8.6) that join the circles of the diameter (d5) and radius (r1), wherein the projection (8.5) is formed by the angle (), the radius (r1) and tangents (8.4), and wherein, in the continuation at the other end (8.2), the diameter (d6) of the length (f3) is the smallest, and the end (8.2) of the axle is cut at a sharp angle ( )).

4. Mechanism according to claim 1, wherein the diameter (d1) is smaller than the diameter (d), wherein the depth (k2) is at most of the depth (k1), wherein the diameter (D) of the elastic ball (11) is smaller than the diameter (d1) of the hole (10.1.2, 10.2.2, 20.1.2, 20.2.2) at the bottom (10.3.1, 10.3.2, 20.3.1, 20.3.2) and wherein the diameter (D) of the elastic ball (11) greater than or equal to the depth (k2) of the hole (10.1.2, 10.2.2, 20.1.2, 20.2.2).

5. Mechanism according to claim 1, wherein on one end (12.1) of the sleeve (12) with an outer diameter (d) and length (j), on the outside of the sleeve (12) at a distance (j4), a semicircular groove (12.2) is provided whose axis (12.3) is at the right angle to the longitudinal axis of the sleeve (12), wherein the distance (4) is the distance between the axis (12.3) of the groove (12.2) and the end (12.4) of the sleeve (12), wherein the maximum depth (g) of the groove (12.2) is less than or equal to half the diameter of the pin (7), wherein at the same end (12.1) inside the sleeve (12), a crown (12.5) of internal diameter (d3) is provided at a distance (j3) from the end (12.4), wherein the crown (12.5) from the end (12.1) of the sleeve (12) is burrowed at the depth (h2) along the circumference of the circle with the diameter (d2) covered by the angle (), wherein the beginning of the crown (12.5) is in one leg of the angle (), wherein the end of the crown (12.5) is on the second leg of the angle (), whereby the surface (12.6) is created, in the form of a part of a circular ring, wherein the recessed flat seat (12.7) is provided on the second leg of the angle () on the surface (12.6) in the form of an isosceles triangle, with the depth (g1), which is the vertex in which the legs of the isosceles triangle are joined, rounded with the radius (r), wherein the seat (12.7) is bordered by the radius (r) and tangents (12.8), that are also the legs of an isosceles triangle and by which the circle of radius (r) and the circle of diameter (d3) are connected, wherein the circle of radius (r) and the circle of diameter (d2) touch at one common point (12.10) with the common axis and wherein opposite the recessed flat seat (12.7), covering the height (j1) of the crown (12.5) and the depth (h2), the depression (12.9) is provided, which corresponds to the seat (12.7) as a mirror image and wherein the circle of radius (r) and the circle of diameter (d2) touch at one point (12.10) with a common axis.

6. Mechanism according to claim 1, wherein the outer diameter (d) of the sleeve (12) and the inner diameter (d) of the hole (10.1.1, 10.2.1, 20.1.1, 20.2.1) form an assembly especially well guided, wherein the inner diameter of the crown (d3) of the sleeve (12) is smaller than the diameter (D) of the elastic ball (11), wherein the length (j) is less than or equal to the depth (k1) and wherein the distance (j4) and the distance (k3) are equal.

7. Mechanism according to claim 4, wherein the outer diameter (d) of the sleeve (12) and the inner diameter (d) of the hole (10.1.1, 10.2.1, 20.1.1, 20.2.1) form an assembly especially well guided, wherein the inner diameter of the crown (d3) of the sleeve (12) is smaller than the diameter (D) of the elastic ball (11), wherein the length (j) is less than or equal to the depth (k1) and wherein the distance (j4) and the distance (k3) are equal.

8. Mechanism according to claim 5, wherein the outer diameter (d) of the sleeve (12) and the inner diameter (d) of the hole (10.1.1, 10.2.1, 20.1.1, 20.2.1) form an assembly especially well guided, wherein the inner diameter of the crown (d3) of the sleeve (12) is smaller than the diameter (D) of the elastic ball (11), wherein the length (j) is less than or equal to the depth (k1) and wherein the distance (j4) and the distance (k3) are equal.

9. Mechanism according to claim 1, wherein the diameter (d4) of the body (8.4) of the axle (8) and the diameter (d2) of the sleeve (12) make the assembly particularly well guided, wherein the diameter (d6) of the end (8.2) is smaller than the diameter (d1) of the hole (10.1.2, 10.2.2, 20.1.2, 20.2.2), wherein the radius (r) of the recessed flat seat (12.7) is greater than the radius (r1) of the projection (8.5) and wherein the maximum value of the angle () is 180.

10. Mechanism according to claim 2, wherein the diameter (d4) of the body (8.4) of the axle (8) and the diameter (d2) of the sleeve (12) make the assembly particularly well guided, wherein the diameter (d6) of the end (8.2) is smaller than the diameter (d1) of the hole (10.1.2, 10.2.2, 20.1.2, 20.2.2), wherein the radius (r) of the recessed flat seat (12.7) is greater than the radius (r1) of the projection (8.5) and wherein the maximum value of the angle () is 180.

11. Mechanism according to claim 3, wherein the diameter (d4) of the body (8.4) of the axle (8) and the diameter (d2) of the sleeve (12) make the assembly particularly well guided, wherein the diameter (d6) of the end (8.2) is smaller than the diameter (d1) of the hole (10.1.2, 10.2.2, 20.1.2, 20.2.2), wherein the radius (r) of the recessed flat seat (12.7) is greater than the radius (r1) of the projection (8.5) and wherein the maximum value of the angle () is 180.

12. Mechanism according to claim 4, wherein the diameter (d4) of the body (8.4) of the axle (8) and the diameter (d2) of the sleeve (12) make the assembly particularly well guided, wherein the diameter (d6) of the end (8.2) is smaller than the diameter (d1) of the hole (10.1.2, 10.2.2, 20.1.2, 20.2.2), wherein the radius (r) of the recessed flat seat (12.7) is greater than the radius (r1) of the projection (8.5) and wherein the maximum value of the angle () is 180.

13. Mechanism according to claim 5, wherein the diameter (d4) of the body (8.4) of the axle (8) and the diameter (d2) of the sleeve (12) make the assembly particularly well guided, wherein the diameter (d6) of the end (8.2) is smaller than the diameter (d1) of the hole (10.1.2, 10.2.2, 20.1.2, 20.2.2), wherein the radius (r) of the recessed flat seat (12.7) is greater than the radius (r1) of the projection (8.5) and wherein the maximum value of the angle () is 180.

14. Mechanism according to claim 1, wherein the length (f1) of the body (8.4) of the axle (8) is greater by 0.5 mm to 0.7 mm than the sum of the distance (3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14) and the length (f1) of the body (8.4) is most preferably greater by 0.6 mm than the sum of the distance (j3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14).

15. Mechanism according to claim 2, wherein the length (f1) of the body (8.4) of the axle (8) is greater by 0.5 mm to 0.7 mm than the sum of the distance (3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14) and the length (f1) of the body (8.4) is most preferably greater by 0.6 mm than the sum of the distance (j3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14).

16. Mechanism according to claim 3, wherein the length (f1) of the body (8.4) of the axle (8) is greater by 0.5 mm to 0.7 mm than the sum of the distance (3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14) and the length (f1) of the body (8.4) is most preferably greater by 0.6 mm than the sum of the distance (j3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14).

17. Mechanism according to claim 4, wherein the length (f1) of the body (8.4) of the axle (8) is greater by 0.5 mm to 0.7 mm than the sum of the distance (3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14) and the length (f1) of the body (8.4) is most preferably greater by 0.6 mm than the sum of the distance (j3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14).

18. Mechanism according to claim 5, wherein the length (f1) of the body (8.4) of the axle (8) is greater by 0.5 mm to 0.7 mm than the sum of the distance (3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14) and the length (f1) of the body (8.4) is most preferably greater by 0.6 mm than the sum of the distance (j3) of the sleeve (12) and the width (b) of the support (15) of the bearings (14).

Description

A BRIEF DESCRIPTION OF THE FIGURES

[0027] For better understanding of the invention and its realization in practice, the author refers to the attached drawings where:

[0028] FIG. 1 shows roller skates in axonometric view;

[0029] FIG. 2 shows a top view of the sole with the incorporated mechanism and wheels;

[0030] FIG. 3 shows the C-C section of the FIG. 2;

[0031] FIG. 4 shows a side view of the front support;

[0032] FIG. 5 shows the section R-R of the FIG. 4;

[0033] FIG. 6 shows a side view of the rear support;

[0034] FIG. 7 shows the section S-S of the FIG. 6;

[0035] FIG. 8 shows a side view of the sleeve with a groove;

[0036] FIG. 9 shows the view P of the FIG. 8;

[0037] FIG. 10 shows the section A-A of the FIG. 8;

[0038] FIG. 11 shows a side view of the axle with the projection;

[0039] FIG. 12 shows the section U-U of the FIG. 11;

[0040] FIG. 13 shows the view P1 og the FIG. 11;

[0041] FIG. 14 shows a section along the longitudinal axis of the axle;

[0042] FIG. 15 shows a side view of the front mechanism

[0043] FIG. 16 shows the section L-L from the FIG. 15 and the axles prepared for mounting;

[0044] FIG. 17 shows the L-L section of FIG. 15 and locked axles in the support sleeve;

[0045] FIG. 18 shows the detail N of the FIG. 16;

[0046] FIG. 19 shows the detail N of the FIG. 17;

[0047] FIG. 20 shows the section L-L of the FIG. 15 and the axles prepared dismounting from the sleeve;

[0048] FIG. 20 shows the section L-L from the FIG. 19;

[0049] FIG. 21 shows the detail N from the FIG. 20;

[0050] FIG. 22 shows a section along the longitudinal axis of the rear support with axles and wheels prepared for mounting;

[0051] FIG. 23 shows detail K from the FIG. 22;

[0052] FIG. 24 shows a section along the longitudinal axis of the rear support with the mechanism and wheels locked;

[0053] FIG. 25 shows detail K from the FIG. 24;

[0054] FIG. 26 shows a section along the longitudinal axis of the rear support with the mechanism and wheels in the position ready for unlocking;

[0055] FIG. 27 shows detail K from the FIG. 26;

[0056] FIG. 28 shows a section of the wheel along the longitudinal axis.

DETAILED DESCRIPTION

[0057] The present invention relates to a mechanism for easy and safe installation with locking, and removal of wheels 4 with axles 8 on footwear 1. Footwear 1 consists of a face 2 and an inner layer 5 which are connected to the sole 6, and are fixed to the user's foot by laces 3. The front support 10 and the rear support 20 are inserted into the sole 6 of the footwear 1. The support 10, 20 from the state of the art, by the same applicant (RS63851B1) is used, wherein the supports 10, 20 are modified for this mechanism. The length of the support 10 is u. The length u is variable and depends on the width of the sole 6 in the area of the toes. The length of the support 20 is u1. The length u1 is also variable and depends on the width of the sole 6 in the area of the heel. The mechanism that is incorporated in the modified supports 10, 20 consists of an elastic ball 11 inserted into the holes 10.1.2, 10.2.2, 20.1.2, 20.2.2 made in the supports 10, 20. The ball 11 is trapped in the holes 10.1.2, 10.2.2, 20.1.2, 20.2.2 using the sleeve 12. The ball 11 has the function of a spring. The sleeve 12 is firmly tied in the holes 10.1.1, 10.2.1, 20.1.1, 20.2.1 of the supports 10, 20 by means of the pin 7 which is inserted into the openings 10.4.1, 10.4.2, 20.4.1, 20.4.2 and at the same time, it passes through the groove 12.2 made on the sleeve 12. In the sleeve 12, the axle 8 is slidably inserted, on which the wheels 4 are slidably and rotatably mounted. With the help of the axle 8, the wheels 4 are firmly and detachably attached to the footwear 1.

[0058] In the axes 10, 10 of the front support 10, which are separated from each other by a distance x, the existing holes with cut threads, whose axes 10, 10 are parallel to the sole 6 of the footwear 1, are modified into two-stage holes 10.1.1, 10.1.2, 10.2.1, 10.2.2. The holes 10.1.1, 10.1.2 are drilled in the axis 10 at the end 10.1 of the support 10. The holes 10.2.1, 10.2.2 are drilled in the axis 10 at the end 10.2 of the support 10. The diameter of the holes 10.1.1, 10.2.1 is d and their depth is k1, measuring from the end 10.1 and the end 10.2, respectively. The diameter of the holes 10.1.2, 10.2.2 is d1 and their depth is k2 and are a continuation of the holes 10.1.2, 10.2.2, and the depth k2 is an extension of the depth k1. The diameter d is greater than the diameter d1, and the total depth k of the two-stage hole 10.1.1, 10.1.2, 10.2.1, 10.2.2 is equal to the sum of the depths k1, k2. On the support 10, there are openings 10.4.1, 10.4.2 provided whose longitudinal axis passes through the circle of the hole with a diameter of d. The axes of the openings 10.4.1, 10.4.2 are perpendicular to the axes 10, 10 of the holes 10.1.1, 10.2.1 Openings 10.4.1, 10.4.2, of the diameter d9, are made at a distance of k3 from the end 10.1, 10.2. The distance k3 is smaller than the depth k1, so the openings 10.4.1, 10.4.2 are made in the region of the holes 10.1.1, 10.2.1. On the support 10, behind the two-stage holes 10.1.1, 10.1.2, 10.2.1, 10.2.2, perpendicular to the axes 10, 10, technical openings 10.5.1, 10.5.2 are provided in order to reduce the mass of the support 10.

[0059] In the axis 20 of the rear support 20, which is parallel to the sole 6 of the footwear 1, at both ends 20.1, 20.2, the existing threaded holes were modified into two-stage holes 20.1.1, 20.1.2, 20.2.1, 20.2.2. The holes 20.1.1, 20.1.2 are drilled in the axis 20 at the end 20.1 of the support 20. The holes 20.2.1, 20.2.2 are drilled in the axis 20 at the end 20.2 of the support 20. The diameter of the holes 20.1.1, 20.2.1 is d and their depth k1, measuring from the end 20.1, and 20.2, respectively, and the diameter of the holes 20.1.2, 20.2.2 is d1 and their depth is k2 and are a continuation of the holes 20.1.1, 20.2.1. The diameter d is greater than the diameter d1, and the total depth k of the two-stage holes 20.1.1, 20.1.2, 20.2.1, 20.2.2 is equal to the sum of the depths k1, k2. The depths k1, k start from the ends 20.1, 20.2, and the depth k2 is in the extension of the depth k1 of the holes 20.1.1, 20.2.1. On the support 20, there are openings 20.4.1, 20.4.2 provided, whose longitudinal axis passes through the circle of the hole with a diameter d. The axis of the opening 20.4.1, 20.4.2 is perpendicular to the axis 20 of the holes 20.1.1, 20.2.1. Openings 20.4.1, 20.4.2, of the diameter d9, are provided at a distance k3 from the end 20.1, 20.2. The distance k3 is smaller than the depth k1, so the openings 20.4.1, 20.4.2 are provided in the region of the holes 20.1.1, 20.2.1.

[0060] Depth k2 of the holes 10.1.2, 10.2.2, 20.1.2, 20.2.2, of both supports 10, 20, is at most of the depth k1 of the holes 10.1.1, 10.2.1, 20.1.1, 20.2.1.

[0061] The mechanism is incorporated in two-stage holes 10.1.1, 10.1.2, 10.2.1, 10.2.2 of the front support 10 and two-stage holes 20.1.1, 20.1.2, 20.2.1, 20.2.2 of the rear support 20. Elastic ball 11 and the sleeve 12, as part of the mechanism, are permanently installed in the two-stage holes 10.1.1, 10.1.2, 10.2.1, 10.2.2, 20.1.1, 20.1.2, 20.2.1, 20.2.2. First, elastic balls 11 are inserted into holes 10.1.2, 10.2.2, 20.1.2, 20.2.2. Then sleeves 12 are inserted slidably into holes 10.1.1, 10.2.1, 20.1.1, 20.2.1. Then, the pins 7 are inserted into the openings 10.4.1, 10.4.2, 20.4.1, 20.4.2 provided on the supports 10, 20 and in the groove 12.2 provided on the sleeve 12. The firm connection of the sleeve 12 with the supports 10, 20 is realized by means of a pin 7, so that the sleeves 12 with the balls 11 remain permanently in the sole 6 of the footwear 1. The supports 10, 20 are then inserted into the holes made in the sole 6. The holes are provided in the area under the toes and under the heel. The support 10 is inserted into the hole on the sole 6 under the toes, and the support 20 is inserted into the hole under the heel. It is important to point out that the surfaces 10.10, 20.10 of the supports 10, 20 are in the same plane as the surface 6.1 in the sole 6.

[0062] The sleeve 12 is in the form of a hollow tube with an outer diameter d and length j, and it is made of polyamide with glass fiber filler. The outer diameter d of the sleeve 12 and the diameter d of the hole 10.1.1, 10.2.1, 20.1.1, 20.2.1 constitute an assembly which is particularly well guided. At one end 12.1 of the sleeve 12, on the outside, at a distance of j4 from the other end 12.4 of the sleeve 12, a semicircular groove 12.2 is provided, its greatest depth being g. The axis 12.3 of the groove 12.2 is at right angle to the longitudinal axis of the sleeve 12. The greatest depth g of the semicircular groove 12.2 is less than or equal to half of the diameter of the pin 7. The distance j4 and the distance k3 are of the same length, so that the end 12.4 of the sleeve 12 does not protrude from the ends 10.1, 10.2, 20.1, 20.2 of the supports 10, 20.

[0063] At the same end 12.1, but inside the sleeve 12, a crown 12.5 is provided, distal to the other end 12.4 at a distance j3 at an acute angle to the longitudinal axis of the sleeve 12. The inner diameter d3 of the crown 12.5 is smaller than the diameter D of the elastic ball 11, so that the ball 11 after insertion of the sleeve 12 does not fall out of the hole 10.1.2, 10.2.2, 20.1.2, 20.2.2. The crown 12.5 is burrowed at a depth of h2 from the end 12.1 of the sleeve 12, along the circumference of a circle with a diameter d2, covered by the angle . The beginning of the burrow of the crown 12.5 with depth h2 is on one leg of the angle , and the end of the burrow of the crown 12.5 is on the other leg of the angle . The maximum value of the angle is 180 so that the locking and unlocking of the axle 8 with the sleeve 12 can be done as quickly as possible. With this burrow, a flat surface 12.6 in the form of a part of a circular ring of height j1 was formed on the crown 12.5. On the other leg of the angle , on the flat surface 12.6, a recessed flat seat seat 12.7 is provided, in the form of an isosceles triangle, with a depth of g1 in relation to the flat surface 12.6. The seat 12.7 is in the form of an isosceles triangle whose vertex is rounded with a radius r at the junction of the legs of the triangle. Tangents 12.8, which are also the legs of an isosceles triangle, connect a circle with radius r and a circle with diameter d3. A circle with radius r and a circle with diameter d2 touch at point 12.10 with a common axis.

[0064] Opposite the seat 12.7, along the crown 12.5, a depression 12.9 with a depth of h2 and a height of j1 is provided, which, as a mirror image, corresponds to the seat 12.7 and is used for the passage of the projection 8.5, which is provided on the body 8.4 of the axle 8.

[0065] Axle 8 consists of a body 8.4, which is stepped on the outside, and is made of polyamide with glass fiber filler. The length of the body 8.4 is f, which at one end 8.1 has the largest diameter d8 and length f2. The diameter d8 is smaller than the diameter d14 of the wheel 4, and larger than the diameter d13 of the support 15. This is necessary and has a purpose of keeping the wheel 4 on the axle 8. Further, the diameter d8, along the body 8.4, is reduced to the diameter d4 of the length f1. The diameter d4 of the body 8.4 of the axle 8 and the diameter d2 of the sleeve 12 render the assembly particularly well guided. The diameter d4 is further along the body 8.4 at an acute angle to the longitudinal axis of the body 8.4, reduced to a diameter d5 which is smaller than the diameter d3 of the sleeve 12, and whose length is f4. The length f4 of the body 8.4 is bigger than the height j1 of the crown 12.5 so that the projection 8.5 on the body 8.4 could rotate above the surface 12.6 in the sleeve 12, when the ball 11 is most deformed. Further along the body 8.4, the diameter d4 is reduced, at the length f5, so that the reduction is covered by: the angle 360, the radius r1 which has one common point 8.7 with the diameter d4, at the half of the angle , and the tangents 8.6 that join the circle of diameter d5 and a circle of radius r1. In the continuation of the axle 8, at the other end 8.2, the body 8.4 has the smallest diameter d6. Length f3 with the diameter d6 is cut at the end of 8.2 at a sharp angle .

[0066] In the axis of the body 8.4, at the end 8.1, a hole 8.3 of depth f6 and diameter d7 is provided. A steel pin 9 is inserted into the hole 8.3, the steel pin 9 being firmly connected to the body 8.4. The pin 9 has a smaller length than the depth f6 of the hole 8.3, so after inserting the pin 9 into the hole 8.3, a plug 13 is inserted whose outer circular surface 13.1, after insertion into the hole 8.3, is in the plane of the end 8.1 of the body 8.4. The pin 9 is inserted into the body 8.4 because that part of the body 8.4 of the axle 8 suffers the greatest strain during use. In the assembly with the sleeve 12, one part of the pin 9 in the body 8.4 is in the sleeve 12, and the wheel 4 is placed on the other part. The wheel 4 is slidably and rotatably connected to the axle 8 on the part of the body 8.4 which has the diameter d4.

[0067] If the axle 8 is made of steel, it is in the shape of the body 8.4, but without the hole 8.3. The wheel 4 is an integral part of the footwear 1, when the footwear is used for rolling, and together with the support 15 of the bearings 14, has the width b. The support 15 has an internal diameter of d13. The diameter d13 of the support 15 and the diameter d4 of the body 8.4 form a loose assembly, so that the wheel 4 can turn and slide on the part of the body 8.4 of the length f1.

[0068] The length f1 of the body 8.4 is equal to the sum of the width b of the support 15 and the distance j3 from the end 12.4 of the sleeve 12 increased by 0.5 mm to 0.7 mm, preferably by 0.6 mm. This is necessary in order to ensure the movement of the axle 8 in the sleeve 12 for the purpose of locking, i.e. that the projection 8.5 is above the surface 12.6, i.e., the unlocking of the axle 8 in the sleeve 12.

[0069] The placement of the axles 8 in the sleeve 12 is done by first pulling the wheels 4 on the body 8.4 over the end 8.2. At the same time, holding the axle 8 by the end 8.1, together with the mounted wheel 4, the axle 8 is manually inserted into the sleeve 12 and tightly connected or separated from the sleeve 12. In order for the axle 8 to come to the position that ensures locking, it is necessary to rotate the axle 8 so that the projection 8.5 on the body 8.4 passes through the depression 12.9 above the crown 12.5. By manually pressing one end 8.1 of the axle 8, the end 8.2 deforms the elastic ball 11. In this way, the projection 8.5 comes above the surface 12.6. Then the axle 8 is rotated until the projection 8.5, under the action of the force from the elastic ball 11, falls into the seat 12.7 of depth g1. After that, the wheels 4 with the axle 8 are firmly connected to the sleeve 12, i.e. the supports 10, 20.

[0070] When taking off the wheels 4 is desired, that is, use of the footwear for walking, the axle 8 is slightly pushed axially in the sleeve 12, the ball 11 is additionally deformed, so that the projection 8.5 comes out of the groove 12.7. After that, the axle 8 is moved by a circular motion to the depression 12.9 and under the action of the elastic force from the ball 11, it is removed from the sleeve 12 together with the wheels.

[0071] The supports 10, 20, sleeve 12, body 8.4 and plug 13 are made of plastic with filler, and it is most preferable to make them of polyamide with 30% of glass fibers. Elastic ball 11 is made of polyurethane 305 ShA.

[0072] For better storage and easier carrying of wheels 4 and axles 8, wheels 4 are removed from axle 8 and placed in a specially made case, next to each other, and axles 8 are placed one above the other next to the wheels 4.