The subject of the invention is a shoe sole - pedal body system for increasing the efficacy of transfer of force while propelling bicycles, which system allows an improved transfer of force applied for propelling bicycle through the crank of the bicycle, and also allows a quick and simple disengaging of the cycling shoe from the pedal with the help of the shoe sole forming a part of the system, which shoe sole is suitable also for general walking thanks to its configuration.

It is a very important objective to ensure that the motive force is transferred with high efficacy to the driving mechanism of bicycles, primarily for cyclists participating in races, but nowadays also for the general public travelling with bicycles. It is a well know fact, that the driving of the bicycle has a best efficacy, when the shaft of the pedal is beneath the transverse arch of the foot, so that all muscles of the leg can participate in the pedalling action.

A number of solutions have been developed for the bicycle racers, which also utilize the horizontal component of the rotating moment occurring during driving, thus increasing the efficacy. However, these solutions have two disadvantages. One of the disadvantages is that a special shoe is required, which cannot be used in normal everyday life, and on the other hand, these solutions are often rather dangerous and could lead to accidents, if the cyclist is not able to disengage the shoe quickly enough from the special pedal configuration.

According to the state of art the European patent EP 2 292 505 makes known a shoe positioning system for bicycles, wherein positioning blocks are fixed to both surfaces of the pedal by means of screws, and each of them is provided with three small spherical positioning units. The spherical positioning units can be placed in any of the many recesses formed in the shoe sole. The spherical positioning units are placed and fixed through the bottom openings of the recesses, so that the spherical positioning units are fixed at the narrowed end parts of the recesses.

The US patent US 4 662 090 makes known a bicycle shoe, in the sole of which recesses are formed directly below the transverse arch of the foot in a parallel zone, so that they accurately fit into the serrated parts formed on both sides of the pedal, and the serrated part formed in the sole has a size accurately fitting the pedal.

The French patent FR2612868 makes known a device, which allows fixing of shoes to the bicycle pedals without the use of toe strap. This device is a pedal, which is provided with a rear opening. There is a small plate on the pedal with a sheet, which is inserted in the opening, with the help of which the device blocks the feet on the pedal, and it basically serves the cycling sport.

The Taiwanese patent TWM271809 makes known a bicycle pedal having no heel spring, and describes a holding plate for bicycle shoes. The Hungarian patent HU 122594 makes known bicycle pedal, where rubber parts are used for transferring the treading movement, characterised by that, the rubber parts are rubber cylinders or prisms which preferable can be rotated relative to the supporting and fixing metal parts, so that they protrude from the side plates and middle parts of the pedal, therefore, they extend beyond the edges or covers of these metal parts, as a result of which the shoe touches only the rubber parts while pedalling.

The disadvantages of the above solutions is that they do not allow for the cyclist to snap on and at the same time position the shoe on the pedal in a simple way, while ensuring that the force transfer surface is directly beneath the traverse arch of the foot, i.e. in the line of the metatarsal bones (knuckles). Also, these solutions do not allow for the cyclist to remove, i.e. disengage the shoe from the pedal with a simple instinctive movement.

While developing the solution according to the invention we had the aim to create a solution, which ensures the efficient transfer of motive force exerted by the cyclist to drive the bicycle, and furthermore which allows the general use of the cycling shoe, and makes sure that the cyclist could dismount the bicycle in a very simple way quickly and safely.

While creating the solution according to the invention we recognised that, if one force transfer element formed from sphere, having radius r, featuring spherical-cap shaped recesses having two rounded edges, aligned in parallel with the flat surface formed with rounded edge and the surface of the connecting element, is placed on one or both ends of one but preferably on both surfaces of the connecting element having axis t2, in parallel with the surfaces of the connecting element, and perpendicularly to the supporting element, having axis tl, connected to the crank of the bicycle, which force transfer element(s) interlock precisely within the coupler hole(s) formed in the shoe sole with flat surface in parallel with the walking plane of the shoe sole, and having two spherical caps aligned perpendicularly to it, and furthermore, the force transfer surface of the supporting element of the pedal body interlocks precisely within the recess created in the shoe sole between the coupler holes, the set out aim can be achieved.

The invention is a shoe sole - pedal body system for increasing the efficacy of transfer of force while propelling bicycles, which system consists of a pedal body and a shoe sole configuration matching the pedal body. It is characterised by that, one force transfer element formed from sphere, having radius r, featuring spherical-cap shaped recesses having two rounded edges, aligned in parallel with the flat surface formed with rounded edge and the surface of the connecting element, is placed on one or both ends of one but preferably on both surfaces of the connecting element having axis t2, in parallel with the surfaces of the connecting element, and perpendicularly to the supporting element, having axis tl , connected to the crank of the bicycle, which force transfer element(s) are fitted in a shape closing manner in the coupler hole(s) formed in the shoe sole with flat surface in parallel with the walking plane of the shoe sole, and having two spherical caps aligned perpendicularly to it, and furthermore, the force transfer surface of the supporting element of the pedal body is fitted in a shape closing manner in the recess created in the shoe sole between the coupler holes. In a preferred embodiment of the solution according to the invention the radius of the spherical-cap shaped recesses of the force transfer element is identical to the radius of the spherical caps formed in the shoe sole.

In another preferred embodiment of the solution according to the invention the smallest width of the coupler hole is identical to the smallest width at the spherical-cap shaped recesses of the force transfer element, i.e. SI = S2.

In a further preferred embodiment of the solution according to the invention the smallest width of the coupler hole is located at a distance Ml from the flat surface, while the smallest width at the spherical-cap shaped recesses of the force transfer element is located at a distance M2 from the flat surface, and Ml = M2.

In a further preferred embodiment of the solution according to the invention the flat surface of the force transfer element formed from a sphere, having a radius„r", is located at a distance K from the centre of the spherical shell surface, where K > r/2, and the connection between the spherical shell surface and the flat surface is prepared with a rounded edge.

In a further preferred embodiment of the solution according to the invention the supporting element is a truncated spherical body, the force transfer surfaces of which are parallel with the surfaces of the connecting element, which force transfer surfaces in this case are in contact with the flat surface between the coupler holes of the shoe sole.

In a further preferred embodiment of the solution according to the invention the shoe sole in the vicinity of the coupler holes is made from harder base material, while the rest of the shoe sole is made from more flexible material.

In a further preferred embodiment of the solution according to the invention the radius of the spherical shell surface of the force transfer elements is r = 1.8 - 2.2, preferably 2 cm.

In a further preferred embodiment of the solution according to the invention two connecting elements are formed in parallel with each other on supporting element, at the end of which 1 - 8 pieces of force transfer elements are placed.

The solution according to the invention is furthermore set forth by the enclosed drawings:

Fig. 1 show a possible preferred embodiment of the shoe sole - pedal body system 1 according to the invention.

Fig. 2 shows a possible preferred embodiment of the pedal body 4 according to the invention.

Fig. 3 shows the enlarged version of section A-A introduced in Fig. 2.

Fig. 4 shows the top view of the pedal body 4 according to the invention configured as shown in Fig. 2. Fig. 5 shows the lateral view of the pedal body 4 according to the invention configured as shown in Fig. 2, as seen from the direction of the crank.

Fig. 6 shows the lateral view of the pedal body 4 according to the invention configured as shown in Fig. 2.

Fig. 7 shows the cross sectional view of shoe sole - pedal body system 1 according to the invention in coupled condition.

Fig. 8 shows the partial longitudinal cross section of shoe sole - pedal body system 1 according to the invention in coupled condition.

Fig. 9 shows the cross section of the shoe sole - pedal body system 1 according to the invention in a condition before coupling, together with the enlarged image of this cross section.

Fig. 10 shows the cross section of a possible embodiment of the shoe sole - pedal body system 1 according to the invention in fitted condition, with foot placed in the shoe. Fig. 11 shows the cross section of another possible embodiment of the shoe sole - pedal body system 1 according to the invention in fitted conditions, when the foot is placed in the shoe.

Fig. 1 show a possible preferred embodiment of the shoe sole - pedal body system 1 according to the invention. In the figure it is possible to see the pedal body 4, which is fixed to the crank 2 of the bicycle in a known manner, as well as the shoe sole 3 of the shoe sole - pedal body system 1. A connecting element 12, having an axis t2, is attached to the supporting element 11, having an axis tl, of the pedal body 4, and there are, in this case, two force transfer elements 13 on each of the opposite surfaces 20,21 of the connecting element 12, which are provided with spherical-cap shaped recesses 15 and flat surfaces 16.

Additionally, the figure shows the two coupler holes 6 formed in the bottom of the shoe sole 3 with flat surface 18 and spherical caps 19, as well as the recess 8 created between the two coupler holes 6. The recess 8 is necessary to make sure that the top surface of the supporting element 1 1, i.e. the force transfer surface 23 could lay upon the shoe sole 3 during use.

Fig. 2 shows a possible preferred embodiment of the pedal body 4 according to the invention. The supporting element 1 1, having axis tl, can be seen in the figure, which is provided with a shaft with threaded end 10, and the connecting element 12, having axis t2, of the pedal body 4 can be seen in the figure. The shaft with thread end 10 is connected to the supporting element 11 in a known manner using bearing, so that the pedal body 4 can rotate around the shaft.

Force transfer elements 13, two in this case, are located on both opposite surfaces 20, 21, of the connecting element 12, and they are provided with spherical-cap shaped recesses 15 and flat surfaces 16.

It is well visible in the figure, that the force transfer elements 13 have been formed from spherical shell surface 14 so that their flat surfaces 16 are parallel with surfaces 20, 21 of the connecting element 12, while rounded edge 17 was prepared between the spherical shell surface 14 and the flat surface 16. The two spherical-cap shaped recesses 15 created in each of the force transfer elements 13 are aligned in parallel with surface 22 of the connecting element 12.

The force transfer surface 23 can also be seen on the supporting element 1 1 at the side towards surfaces 20, 21, which in this case is a section of the cylindrical supporting element 11.

Fig. 3 shows the enlarged version of section A-A introduced in Fig. 2. In the figure it is possible to see the force transfer elements 13 formed with spherical shell surface 14 on the connecting element 12, together with its spherical-cap shaped recesses 15 and rounded edges 17.

Fig. 4 shows the top view of the pedal body 4 according to the invention configured as shown in Fig. 2. Fig. 5 shows the lateral view of the pedal body 4 according to the invention configured as shown in Fig. 2, as seen from the direction of the crank. Fig. 6 shows the lateral view of the pedal body 4 according to the invention configured as shown in Fig. 2. The components that can be seen in the figures include the pedal body 4, its supporting element 1 1, which is provided with shaft with threaded end 10, and also its connecting element 12 aligned perpendicularly to it. Force transfer elements 13, two in this case, are located on both opposite surfaces 20, 21, of the connecting element 12, and they are provided with spherical-cap shaped recesses 15 and flat surfaces 16. It is well visible in the figures, that the force transfer elements 13 have been formed from spherical shell surface 14 so that their flat surfaces 16 are parallel with surfaces 20, 21 of the connecting element 12, and rounded edge 17 was prepared between the spherical shell surface 14 and the flat surface 16. The two spherical-cap shaped recesses 15 formed in each of the force transfer element 13 are aligned in parallel with the surface 22 of the connecting element 12.

Fig. 5 also shows also the force transfer surfaces 23 on the supporting element 11.

Fig. 7 shows the cross sectional view of shoe sole - pedal body system 1 according to the invention in coupled condition. Fig. 8 shows the partial longitudinal cross section of shoe sole - pedal body system 1 according to the invention in coupled condition. The components that can be seen in the figures include the pedal body 4, as well as its supporting element 1 1, which is provided with shaft with threaded end 10, together with its connecting element 12 aligned perpendicularly to it. It can be seen that force transfer elements 13, two in this case, are located on both opposite surfaces 20, 21, of the connecting element 12, and they are provided with spherical -cap shaped recesses 15 and flat surfaces 16. The two coupler holes 6 can also be seen, which are formed in the shoe sole 3 with flat surface 18 and spherical caps 19. It is well visible in the figures that in this case the force transfer elements 13 of the pedal body 4 are snapped into the coupler holes 6 of the shoe sole 3. As a result of this, the flat surfaces 16 of the force transfer elements 13 contact the flat surface 18 formed in the coupler hole 6 of the shoe sole 3, and at the same time, the spherical-cap shaped recesses 15 of the force transfer elements 13 interlock precisely with the spherical caps 19 of the coupler hole 6.

Fig. 8 also shows one of the force transfer surfaces 23 of the supporting element 11, which in this case is a section of the cylinder wall of the cylindrical supporting element. As a result of this, the supporting elements 1 1 interlocks precisely with the recess 8 formed in the shoe sole 3.

Fig. 9 shows the cross section of the shoe sole - pedal body system 1 according to the invention in a condition before coupling, together with the enlarged image of this cross section. The pedal body 4 can be seen in the figure, with shaft with thread end 10, together with the force transfer elements 13, as well as the coupler holes 6 in the bottom of the shoe sole 3.

It can be well seen in the enlarged image, that the shape and size of the coupler hole 6 match the shape and size of the force transfer element 13. Accordingly, the radii R of the spherical cap 19 formed in the shoe soles are equal to the radii R of the spherical-cap shaped recesses 15 of the force transfer element 13, which has a width T.

Furthermore, the smallest width SI of the coupler hole 6 is identical to the smallest width S2 at the spherical-cap shaped recesses 15 of the force transfer element 13. Also, the part of the coupler hole 6 having the smallest width SI is formed at a distance Ml from the flat surface 18, and at the same time, the smallest width of the spherical-cap shaped recesses 15 of the force transfer element 13 is located at a distance M2 from the flat surface 16, and Ml = M2.

The function of the rounded edge 17 of the force transfer element 13 can also be seen well in the figure. When the shoe sole 3 of the shoe is placed on the pedal body 4, then the rounded edge touches the edge of the spherical cap 19, and in response to the force exerted on the shoe sole, the rounded edge 17 facilitates guiding the force transfer element 13 so that it can snap into the coupler hole 6. This snapping in occurs, if the width T of the force transfer element is over the width SI of the coupler hole SI, i.e. T > SI , where the preferred values are T= 20 mm and Sl= 16-18 mm during implementation.

However, the precise interlocking, therefore, the strength of the joint or its releasing ability, i.e. the force required to snap on and releasing the pedal body 4, is determined by the resilience of material of the shoe sole 3. Hard base materials ensure a stronger bond, while softer materials provide a weaker bond. In this way, the binding force can be influenced by selecting the material of the shoe sole 3.

In order that the shoe 24 having shoe sole of the shoe sole - pedal body system 1 according to the invention could ensure a comfortable feeling also when walking on the ground, a harder material should be used for the shoe sole 3 in the vicinity of coupler holes 6 formed in the shoe sole 3, while the rest of the shoe sole 3 could be made from more flexible material.

Fig. 10 shows the cross section of a possible embodiment of the shoe sole - pedal body system 1 according to the invention in fitted condition, with foot placed in the shoe. The pedal body 4 and shoe sole 3 of the shoe sole - pedal body system 1 can be seen in the figure in fitted condition.

The figure shows the connecting element 12, having axis t2, aligned perpendicularly to the supporting element 11, having axis tl, of the pedal body, and the two force transfer elements 13 placed on each of the opposite surfaces 20, 21 of the connecting element 22. The figure also shows the two cylindrical coupler holes 6 formed in the bottom of shoe sole 3 with flat surface 18, as well as the recess 8 created between the two coupler holes 6. The recess 8 is necessary, so that the top surface of the supporting element 1 1, i.e. the force transfer surface 23, which in this case is a part of a cylinder, could blend into the shoe sole 3.

It can be well seen in the figure, that the supporting element 1 1, having axis tl, and the recess 8 formed in the shoe sole 3 are created in a precisely interlocking manner. Furthermore, the supporting element 1 1, having axis tl, and the recess 8 are aligned beneath the transverse arch 26 (metatarsal bone head, knuckle) located on the sole of the foot 25. It can also be seen well, that the flat surfaces 16 of the force transfer elements 13 are below parts of the sole of the foot 25, where the sole of the foot 25 does not touch the shoe sole 3.

This ergonomic configuration greatly contributes to the comfortable use as opposed to other known solutions.

When using the shoe sole - pedal body system 1 , the cyclist exerts the drive force by the muscles of the thigh and the shin through the transverse arch 26, actually at the metatarsal bone head of the sole of the foot 25. This is why it is very important to align the transverse arch 26 of the foot 25, the recess 8 of the shoe sole 3 and the supporting element 11 of the pedal body 4 accurately in a single plane on top of one another, i.e. in the plane determined by axes tl and t2, in a perpendicular plane containing axis 3.

The distance H between the supporting element 11 of the pedal body 4 and the flat surface 16 is indicated in the figure. The distance L between the recess 8 formed in the shoe sole 3 and the flat surface 18 of the coupler hole 6 is also shown. The condition L = H shall be met in order to ensure the most efficient working of the shoe sole - pedal body system 1.

Fig. 1 1 shows the cross section of another possible embodiment of the shoe sole - pedal body system 1 according to the invention in fitted conditions, when the foot is placed in the shoe.

This figure essentially shows the arrangement according to Fig. 10, except that no recess 8 is formed in the shoe sole 3 between the two coupler holes 6. Furthermore, a cylinder section is removed from the cylindrical supporting elements 11 of the pedal body 4, thus creating a horizontal force transfer surface 23.

It can be seen well in the figure, that the transverse arch 26 of the foot 25 is positioned directly above the surface of the force transfer element 23 in a single plane, i.e. in the plane determined by the axes tl and t2, in a perpendicular plane containing axis 3.

In case of a preferred actual embodiment of the solution according to the invention the pedal body is produced in a way, that a shaft with threaded end 10 is fixed to one end of the supporting element 1 1, which is joined in known manner with bearing to the supporting element 1 1. The pedal body 4 is connected to the crank 2 of the bicycle with the help of the shaft with threaded end 10. The connecting element 12 is formed with surfaces 20, 21, having axis t2, at the middle of the supporting element 1 1 perpendicularly to axis tl. The force transfer elements 13 are mounted on the connecting element 12. This could have various versions as follows:

- A force transfer element 13 is formed at one of the ends of surface 20 of the connecting element 12, and in this case no force transfer element 13 is formed on surface 21.

- There is a force transfer element 13 on the ends of surfaces 20, 21 of the connecting element 12.

- A force transfer element 13 is formed on both ends of the one surface 20 of the connecting element 12. No force transfer element 13 is formed on surface 21 in this case.

- One force transfer element 13 is formed on both ends of surfaces 20, 21 of the connecting element 12.

Two connecting elements 12 running in parallel may be formed in the given case to the supporting element 1 1 in case of an embodiment according to the invention. In this case the force transfer elements 13 can be placed in any variation according to the above configurations. In case of this configuration, 1-8 pieces of force transfer elements 13 can be placed in different variations, and 1 -4 pieces of coupler holes 6 can be formed in the shoe sole 3 in this case.

In case of the solution according to the invention, preferably one or two force transfer elements 13 are placed on each surfaces 20, 21 of the connecting element 12, because the pedal body 4 can rotated around its axis tl relative to the shoe sole 3 during use, therefore, surface 20 or surface 21 of the pedal body 4 may be in the top position. In this way it is made sure that the cyclist can place the coupler hole 6 formed in the shoe sole easily on the force transfer element 13 actually being in the top position.

The force transfer elements 13 placed on the connecting element 12 are formed preferably from a spherical shell surface 14 in a way, that a flat surface 16 is created at the top part of the spherical shell surface 14 in parallel with surfaces 20, 21 at a distance K from the centre of the spherical shell, the connection of which flat surface 16 and the spherical shell surface 14 is established with a rounded edge 17, where K > r/2.

The purpose of this rounded edge 17 is to make sure that the cyclist could guide the coupler hole 6 created in the shoe sole 3 onto the force transfer element 13 more easily. I addition to that, spherical-cap shaped recesses 15 are formed in the spherical shell surface 14 of the force transfer element 13 at opposite sides in parallel with the surface 22. The connection of the spherical-cap shaped recesses 15 and the spherical shell surface 14 is established with a rounded edge 17.

Coupler holes 6 are formed in the shoe sole 3 of the shoe sole - pedal body system 1 for receiving and fixing the force transfer element 13 of the pedal body 4. The coupler hole 6 is formed as a negative shape of the force transfer element 13, so that a shape closing connection is created. Accordingly, a flat surface 18 is created in parallel with the walking surface of the shoe sole 3 in the cylindrical coupler hole 6, the size of which is matched to the flat surface 16 of the force transfer element 13. Furthermore, there are two spherical-cap shaped recesses 19 positioned opposite to each other, which have size and locations matching the spherical-cap shaped recesses 15 of the force transfer element 13.

In case of a further possible embodiment of the solution according to the invention the coupler hole 6 is formed in a separately produced bushing, and this bushing is installed in the shoe sole 3.

In case of the solution according to the invention, a recess 8 is preferably created in the shoe sole 3 at the part between the coupler holes 6, the shape and size of which shoe sole 8 is determined in a way, that it fits to the force transfer surface 23 in a shape closing manner, i.e. it is the negative shape of the surface.

The recess 8 in the shoe sole 3 is created at a location, where it is accurate positioned beneath the transverse arch 26 of the foot 25, i.e. accurately in parallel with the line of head of metatarsal bone (knuckle). In this case of the shoe sole - pedal body system 1 the force transfer surface 23 of the pedal body is exactly below the transverse arch 26, which propagates a significant force, and in this way the force is directly transferred to the pedal 4.

Furthermore, the coupler holes 6, together with flat surfaces 16 of the force transfer elements 13 installed in them are located beneath a part of the foot 25, where the sole of the foot 25 does not touch the shoe sole 3.

The supporting element can have a cylindrical shape, and in this case both the shape and size of the recess 8 formed in the sole 3 are matched to this geometrical form,meaning that the recess 8 is formed as a negative of the part of the cylinder wall. In this case the force transfer surfacess 23 formed as part of a cylinder wall are situated at both sides of the of the supporting element 1 1 towards the surfaces 20, 21, which fit in the recess 8 in a shape closing manner.

The supporting element 11 may be a truncated cylinder, when cylinder sections are cut from the cylindrical supporting element in parallel with the plane determined by axes tl and t2, and also in parallel with surfaces 20, 21 , thus creating flat force transfer element 23 on the supporting elements 11. In this case the recess 8 is not created in the shoe sole 3, instead, the force transfer surface 23 directly touches the shoe sole.

The supporting element 1 1 can have square or rectangular cross section also, and then its planar surface aligned in parallel with surfaces 20, 21 provide the force transfer surfaces 23. In this case the recess 8 is not created in the shoe sole 3, instead, the force transfer surface 23 directly touches the shoe sole.

In case of an advantageous preferred application of the solution according to the invention the cyclist wears a shoe having a shoe sole 3, and places the coupler holes 6 of the shoe sole 3 on the force transfer elements 13 of the pedal body 4, and then exerts a slight push to snap the coupler holes 6 of the shoe sole on the force transfer elements 13. The rounded edges 17 formed on the force transfer element 13 make this process easy. In case of this operation, the force transfer element 13 is snapped on with the help of the rounded edge 17, when a slight pressure is applied on the spherical caps 19 of the coupler hole 6, and the spherical-cap shaped recess 15 of the force transfer element 13 fits to the spherical caps 19 of the coupler hole 6, while the flat surface 16 of the force transfer element 16 meets the flat surface 18 of the coupler hole 6.

When the cyclist intends to take off his/her leg from the pedal, then a slight pull is to be applied and the above process takes place in reversed sequence.

In case of the solution according to the solution a bicycle driving arrangement is created between the pedal body 4 and the shoe sole 3 through a rigid mechanical (joint) bond.

The contact between the force transfer element 13 and the coupler hole 6 makes sure that the driving force coming from the horizontal component of the force exerted by the cyclist is added more efficiently and in a more uniform manner to the torque occurring on the shaft of the drive gear.

The shape closing connection between the spherical-cap shaped recess 15 of the force transfer element 13 and the spherical-cap 19 of the coupler hole 6 makes sure that the crack 2 can be rotated opposite to the travel direction (lifted), so that the cyclist could align the pedal body 4 to the desired position easily.

In case of the shoe sole - pedal body system 1 according to the invention, the larger portion of the force exerted by the cyclist is transferred through the force transfer surface 23 located beneath the transverse arch 26 of the foot 25. The vertical transfer of force also occurs at the flat surfaces 16 of the force transfer elements 13. At the same time, the horizontal component of the exerted driving force is transferred with the help of the spherical shell surface 14 of the force transfer element 13.

In case of an embodiment according to the invention, the force transfer elements 13 are formed from a sphere having radius r. The size of radius r should be selected in a way, that the coupler holes 6 in the shoe sole 3 are not too large, and provide a comfortable shoe sole 3, and at the same time, the transferred force should be proportional to the surface where the force is transferred.

Accordingly, the selection of r = 2 cm can ensure the optimum embodiment as indicated by our experiences.

The pedal body 4 according to the invention may be made from metal or plastic. The material of the shoe sole 3 is plastic having suitable hardness and resilience.

The flat surface 16 of the force transfer element 13 formed from sphere of radius r according to the invention has a distance K from the centre of the spherical shell surface 14, where K > r/2.This allows the formation of spherical-cap shaped recesses 15 in the force transfer element 13, so that they can perform their fixing function.

The radius r of the spherical shell surface 14 of the force transfer element 13 according to the invention is r= 1.8 - 2.2 cm, preferably 2 cm. The advantages of the solution according to the invention include the outstanding adhesion and transfer of force between the shoe of the cyclist and the pedal body of the bicycle. The production of shoe provided with the shoe sole according to the invention is inexpensive, and the shoe can be used all through the day not just during cycling, and it also ensures the proper positioning of the leg during cycling.

A further advantage of the invention is that the force transfer elements are beneath parts of the foot, where the foot does not touch the shoe sole, so these points of the foot are not affected by the pressure directly.

List of references:

1 - shoe sole - pedal body system

2 - crank

3 - shoe sole

4 - pedal body

6 - coupler hole

8 - recess (groove)

10 - shaft with threaded end (screw)

11 - supporting element

12 - connecting element

13 - force transfer element

14 - spherical shell surface

15 - spherical cap recess

16 - plane surface

17 - rounded edge

18 - flat surface

19 - spherical cap

20 - surface

21 - surface

22 - surface

23 - force transfer surface

24 - shoe

25 - foot

26 - transverse arch (knuckle)

R - radius

r - radius

Ml - distance

M2 - distance

51 - width

52 - width

K - distance