DE19908000A1 - Brake for bicycles comprises two brake blocks fastened to the fork to slide in one direction - Google Patents

Abstract

The brake has two brake blocks (2), fastened to the fork (4) to slide in one direction. This direction is at an acute angle to the tangent of the wheel (3) in the area of the contact face of brake shoes on wheel. At least part of the friction surface of each brake block is located between fork and wheel. The brake blocks are wedge-shaped, with a wedge angle mainly the same as the acute angle, which is less than 45 deg , especially less than 30 deg .

Description

The invention relates to a wheel brake, in particular for two-wheelers with at least least two brake shoes, each on two opposite sides to one Contact surface of a wheel to generate one of the rotation of the wheel counteracting braking force can be adjusted via an actuating means, the Brake shoes on a friction surface substantially parallel to the contact surface point and the wheel on one, in particular a handlebar fork or one Frame area formed wheel fork is mounted.

Wheel brakes of this type are particularly preferred for two-wheelers Bicycles or light motor-driven two-wheelers used. From the German patent application DE 38 28 715 is such a wheel brake as a front derradbremse known for a bicycle. In this configuration, the wheel brake se the brake shoes are attached to a lever gear, which via an upper half of the wheel arranged axis with the actuator designed as a cable pull means is connected. To pull the cable into a lateral Adjusting the movement of the brake shoes against the rim edges of the wheel zen, the wheel brake has two laterally arranged force deflections that cause a scissor-like structure of the lever mechanism.

The lateral force redirection in the form of two axes of rotation, however, hide that Risk in itself that the bearings required for this different Rei Exercise losses, so that on the one hand, by the rider of the bike applied braking force is distributed unevenly between the two brake shoes and on the other hand the resetting of the brake shoes after releasing the brake done unevenly. However, the latter often means that after loosening the Brake a brake shoe is very far from the rim while the ge Opposite brake shoe still rubs on the rim. This is not just with increased noise but also associated with a residual braking effect that the driver feels uncomfortable.

Furthermore, only limited braking forces can be exerted on such constructions be brought because the shear force acting on the individual brake shoes  completely via side levers and one regarding torque transmission unfavorable leverage ratio of the pulling force of the cable on the Bremsbac ken must be transferred. Finally, the lever gear is proportional elaborately constructed, so that in addition to correspondingly high manufacturing costs and the increased risk of failure, a large space requirement arises, which some Possible uses are not available.

The object of the invention is therefore an effective, as inexpensive as possible and low-maintenance wheel brake to create a symmetrical rear position of the brake shoes.

This object is achieved according to the invention in that the brake shoes in a sliding direction on the wheel fork are slidably mounted, the Direction of displacement at an acute angle α to the tangent of the wheel in the loading extends the contact area.

Due to the design of the wheel brake according to the invention, a Displacement of the brake shoes in one direction along the direction of travel of the with the wheel brake equipped vehicle the individual brake shoe between rule the wheel fork and the contact surface, the The friction surface of the brake shoes transmits the braking force. A side selection The brake shoes are ver due to the massive construction of the wheel fork prevents the actuating means from pressing or pulling cause the brake shoes in the gap between the wheel and the wheel fork.

The new wheel brake is preferred as the front wheel brake of a bicycle or light motorcycle used. However, it can also be used as a rear wheel Brake of such vehicles are used, in which case the Brake shoes, for example, on the frame part holding the rear wheel, the can also be stored in the form of a (non-steerable) wheel fork. Also one Use with other vehicles, such as wheelchairs, luggage or strollers or similar is possible. It is also possible to use the Kon to provide tact areas on the side walls of the rim flange, as with for example, the case with the known bicycles. But it can also  Brake shoes act on the tires or on a separate brake disc is attached to the wheel.

With a suitable mounting option, the brake shoes can be attached to any win kelpposition of the rim are arranged. For the embodiment according to the invention tion are the brake shoes, which can be arranged on a carrier plate NEN, preferably wedge-shaped, so that the contact surface of the wheel and the friction surface of the brake shoes are arranged parallel to each other. This is the wedge angle β of the brake shoes is equal to the angle α, ie the angle around the direction of displacement of the brake shoes relative to the plane of the wheel rotation is angled.

The angle α is preferably less than 45 °, in particular less than 30 °, since with the actuation path of the actuating means increases at a smaller angle, the brake response also becomes less toxic. To quickly To be able to build up a minimum braking effect, the angle α should be 5 ° to 10 ° do not fall below. Of course, this also depends on how large the gap between the friction surface and the contact surface at ent tensioned wheel brake.

The brake shoes can be in the gap between the wheel and the wheel fork be arranged, but do not have to be for the function of the invention. she can also be arranged in front of or behind the wheel fork, with in In this case, an unfavorable torque transmission will occur, which is why this arrangement can only be selected in some special applications becomes.

Depending on the application, the wheel brake can be used as a self-releasing brake or as self-locking brake be formed. In the first case, the brakes after the actuating force ceases to automatically return to the non-braking position reset if the direction of displacement of the brake shoes of the direction of rotation of the wheel is opposite, the actuating force of the brake so the friction must counteract force. This will be the preferred design for everyone Vehicle brakes for vehicles of the conventional type, while Si  security vehicles, such as luggage trolleys, prams, and medical elevators len or similar a so-called "dead man circuit" may be desired can. In this, the brake could be designed so that the braking force and the frictional force act in the same direction, so that the frictional force not only braking also causes further tightening of the Brake, which then leads to further reinforcement of the braking effect.

Suitable configurations of a self-releasing brake have, for example an actuating means in the form of a lever on the in the case of a bicycle Brake is placed in front of the fork and the brake shoes from front to back into the gap between the wheel and the wheel fork. For this, the Operating lever in turn be pivotally attached to the fork, about un below the brake shoes and extend to an upper attachment, which is arranged above the brake shoes. At the top of the actuator The control lever can then attack a cable, which in the case of the front wheel brake se of a bicycle, for example, via a force deflection on the wheel fork can be led to the handlebar and there in the usual handling in shape can be operated by handles or the like.

Due to the special design of the brake according to the invention Force to be applied by the driver is significantly lower than before. This has to Consequence that the brake lever on the handlebars of a bicycle lighter and more delicate can be designed or even replaced by a new component can. So an operating lever can be provided, the only can be triggered via the thumb pressure and thus a considerable security winn, because then the hands and fingers are no longer removed from the steering wheel must be taken to brake the bike. This is particularly so when cornering, when turning, if a hand anyway for direction indication must be removed from the handlebar, or with older unsafe bicycles important to drivers.

The lever for actuating the brake transmits the braking force, for example by pressing the brake shoes in the direction of displacement. With appropriate The arrangement of the functional parts can of course also be done by a tensile force  happen so that the lever by pivoting the brake shoes in the Gap.

In the case of a front brake on a bicycle, for example, they are actuated a brake is provided on both sides of the wheel fork. The two levers are preferably connected to one another above the wheel, so that an actuating means in the form of a redirected cable uniform force can be applied. In this case, the lever has the shape of a one-piece bracket, the lower ends of which pivot on the Wheel fork can be stored. A preferred material for the temple can be Be spring steel, because then a resilient property of the bracket the Bremswir additional smoothing.

So that the wheel brake is not solely due to the possibly existing self-releasing property is relaxed or even by hand in the rest must be returned, it preferably rejects one or more returns springs on. This return spring can act on all parts of the brake be moved due to the actuation of the actuating means. Works preferentially the return spring on the lever or the bracket or on the shift bar mounted brake shoes immediately. In both cases the reset be designed as a tension or compression spring.

The brake shoes can for example in a guide rail with the side edges bent by 180 ° in the manner of a tongue and groove connection be annoyed. The elastic brake shoes can be attached to a carrier plate be ordered that guided longitudinally displaceable within the guide rail is. Grease lubrication can prevent dirt or moisture from entering prevent. In this embodiment, the return spring can be used as a compression spring be formed and with one end on the support plate and with the other attack the end of the guide rail so that when inserting the Brake shoes is pressed into the gap. Also an embodiment as a tension spring is possible here, in which case the spring is usually no longer in the Displacement of the brake shoes will be arranged.  

In a further embodiment of the invention, the lever or Bü takes over the reset function itself partially or completely. This can the lever or the ends of the bracket as a cantilevered bend beams are executed, whereby an elastic deformation of the lever instead the pure pivoting bearing occurs. To material fatigue should avoid in this case the lever or the bow made of spring steel be and can also in the range between the clamping of his En the or its ends and the brake shoe have an eyelet-like loop, which forms a resilient predetermined bending point. This spring characteristic can additionally to be provided for a separate return spring or the complete form the return spring because the spring force to reset the wheel brake does not have to be very large. Another possibility for a return spring is a torsion spring attached directly to the pivotable mounting of the lever is arranged and also a reset of the lever and thus the wheel brake causes.

The actuating means can be hand-operated or foot-operated, the force being can be carried out, for example, using a cable system. On a lever drives, especially in wheelchairs or other vehicles with larger Chassis, possible. A lever mechanism can even be swiveled by the He be formed to move the brake shoes, for example is guided to the handlebars of a bicycle and directly by hand can be done. The brake shoes are preferably each on one Direction of rotation of the wheel arranged conically, firmly connected to the fork Guide rail in the form of the guide rail described above. A kinematic reversal, that is, the carrier plate with the brake shoe then around the smooth guide rail is of course also possible.

In a preferred embodiment, the brake shoes are displaceable tion directly or via a push rod on the trained as a bracket Lever mounted. To achieve the necessary mobility, the brake shoes are set in the direction of displacement while moving in the direction of the temple's longitudinal axis can be moved a short distance to avoid jamming. This can be done, for example, using two retaining pins that are perpendicular to  Bracket from an end region of the carrier plate of the bracket facing the bracket Jump out brake shoes in front of and behind the bracket and as a Mit function for the brake shoes.

Further features and advantages of the invention result from the Unteran say and from the following description of preferred embodiment examples based on the drawings.

In the drawings:

Fig. 1 is a front view of a wheel fork with a first embodiment of the wheel brake,

Fig. 2 is a side view of the wheel of Fig. 1,

Fig. 3 is a plan view of the embodiment illustrated in FIGS. 1 and 2, the wheel brake in section,

Fig. 4 is a front view of a wheel fork with a second embodiment of the wheel brake,

Fig. 5 is a side view of the wheel of Fig. 4,

Fig. 6 is a plan view in FIGS. 4 and 5 the wheel brake shown in section,

Fig. 7 is a side view of a wheel fork with a third embodiment of the wheel brake,

Fig. 8 is a plan view of the embodiment shown in Fig. 7 wheel brake in section,

Fig. 9 is a side view of a wheel fork with a fourth embodiment of the wheel brake and

Fig. 10 is a plan view of the wheel brake shown in Fig. 9 in section.

In Fig. 1 designed as a bicycle fork wheel fork 4 is shown with a wheel brake inventions to the invention. Figs. 2 and 3 show the same embodiment in a side view and a plan view in section. The wheel brake is essentially formed by two brake shoes 2 which can be pressed by the driver for braking via an actuating device 1 into a gap between the wheel fork 4 and the wheel 3 of the bicycle and have a friction surface which is used to brake the wheel 3 Contact surface of a rim of the wheel can be pressed. The actuating device 1 here has a bracket 7 , which is pivotably mounted with two lower ends on one branch of the wheel fork 4 and can be pulled up to the wheel fork 4 with its upper end via a cable pull 9 . The brake shoes 2 are arranged between the upper, over the wheel and, if present, the fender led end of the bracket 7 and fixed with the bracket 7 of the type that this presses the brake shoes 1 into the gap when pulling the end.

The bracket 7 is in the case of the embodiment shown as an almost rigid component which is pivotally mounted against a return spring 5 . The return spring 5 is formed here by a coil spring, which is set as a compression spring. The return spring 5 causes on the one hand that the functional parts are under tension even when released ner wheel brake and thus an unstable, possibly noisy condition is avoided and on the other hand that the brake shoes 2 when releasing the brake by the restoring force again to a defined Point that can be predetermined, for example, by a stop, are pulled out of the gap and a sufficiently large gap between the contact surface of the rim and the friction surface of the brake shoes 2 is formed. This is particularly important in the case of soiling, so that the freedom of movement of the wheel 3 remains guaranteed even when dirt particles become loose and get between the contact surface and the friction surface.

The brake shoes 2 are verbun via a bolt connection to the yoke 7, wherein the bracket 7 has an elongated hole in which the bolt is longitudinally displaceably guided gellängsachse Brushes the. This guide enables the necessary movement of the brake shoes 1 relative to the bracket 7 during the bracket movement, which results from the fact that the bracket 7 is pivoted while the brake shoes 2 are longitudinally displaced.

The braking effect is achieved by a contact force between the brake shoe 2 and the contact surface of the rim. For this purpose, as can best be seen from FIG. 3, the brake shoe 2 is guided in a slide rail 6 which is angled from above by an angle α relative to the plane of rotation of the wheel 3 . This causes that with increasing displacement in the gap, the brake shoes 2 are brought ever closer to the rim or are pressed more and more to the contact surface Kon. So that the brake shoes are loaded as evenly as possible, they are preferably designed as a wedge, the wedge angle β of the brake shoes 2 then corresponding to the angle of attack α, so that the inclined position is compensated again. This results in a largely uniform loading of the brake shoes, which in turn leads to a uniform surface pressure and thus to an optimal implementation of the lever force of the bracket 7 . The result is not only reduced wear of the brake shoes 2, but also a low ironing force.

In the illustrated embodiment the wheel brake, the wheel 3 rotates in the drawn in Figs. 2 and 3 arrow. To operate the brake, the brake shoes 2 are pressed against the direction of rotation in the gap between the wheel fork's 4 and the rim, so that the frictional force of the movement direction of the brake shoes 2 is opposed when braking. This again means that the release force is oriented in the same direction as this friction force, which leads to a self-releasing brake, since the brake shoes 2 are automatically pushed out of the gap by the operator after the brake force is released by the operator. This is a typical application for example for the front brake of a bicycle.

By clamping the brake pads 2 between the individual rails of the wheel fork 4 and the rim of the wheel 3 is a lateral migration of the brake shoes 2 due to the contact force impossible, and ensures effective use of the operating force of the strap. 7 As a result, very low actuation forces are required by the operator, which in turn represents a significant gain in safety. For example, new forms of brake actuation can be selected, for example by means of a brake lever which can be actuated via the thumb and which makes it possible to avoid releasing the handlebar of the bicycle. Furthermore, the application of the brake is made significantly easier, which enables physically weaker people to brake effectively.

In the illustrated embodiment of the wheel brake, the wedge angle β of the brake shoes 2 is equal to the angle between the displacement direction of the brake shoes 2 and the direction of rotation of the wheel 3 . As already mentioned, this leads to a parallelism of the contact surface and the friction surface, whereby the wear of the brake shoes is minimized. If desired, however, the braking behavior can also be modified by choosing the angle β to be somewhat larger or somewhat smaller than the angle α. With a suitable elastic material, for example, a progressive increase in the braking force relative to the displacement path of the brake shoes 2 can be realized.

In Figs. 4, 5 and 6, another embodiment of the wheel brake is shown. In this embodiment, the bracket 7 is designed as a retaining spring 5 . For this purpose, it is clamped with its lower ends in the manner of a bending beam on the wheel fork 4 and has an eyelet-like spring turn in the area between the brake shoes 2 and the lower clamping. The bracket 7 is made of spring steel so that a spring-loaded pivoting in the direction of the wheel plane is possible due to the eyelet-like spring turn. In order to achieve a sufficient actuation path without too much displacement of the brake shoes 2 , the bracket 7 is kinked in the area of the connection with the brake shoes 2 , so that a sufficient path for the cable 9 is available.

In this embodiment, the brake shoes 2 are connected to the bracket 7 via retaining pins 8 . In the direction of the displacement of the brake shoes 2 , a holding pin 8 is arranged in each case in front of and behind the bracket 7 , between which a bolt is mounted, which in turn is firmly connected to a carrier plate for the brake shoe 2 . This results in guidance in the longitudinal direction of the brake shoes 2 and freedom of movement at right angles to this longitudinal direction. This ensures the necessary degree of freedom in order to allow the rotary movement of the bracket 7 on the one hand and the translatory displacement movement of the brake shoes 2 on the other hand with simultaneous connection of the two components.

The brake shoe 2 is guided in a sliding guide 6 , which in turn, for example via a welded connection, is connected to the spar of the wheel fork 4 . In large-scale production, it is possible to provide a flat surface in the area of the slide guide 6 on this spar of the wheel fork 4 , for example by correspondingly reshaping the tube from which the spar is made in order to create a defined contact surface for the slide guide 6 . This enables a safe and easy setting of the required angle α.

The sliding guide 6 is tilted relative to the tangential direction of the wheel 3 by the angle α out of the wheel plane, so that the corresponding direction of movement of the brake shoe 2 results. In the exemplary embodiment shown, the sliding guide 6 is formed by a flat plate, the edge regions of which are flanged in a U-shape. The brake shoe 2 is in turn arranged on a flat carrier plate which is guided in the U-shaped flanged edge regions of the sliding guide 6 in the manner of a tongue and groove connection. This carrier plate is extended in the direction of the bracket 7 beyond the area of the elastic brake pads and has the bolt for connection to the bracket 7 in this extended area. This bolt can be screwed te to facilitate replacement of the brake shoes 2 in the event of wear in the Trägerplat te, so that after unscrewing the bolt, the brake shoe 2 can be easily pulled out of the sliding guide 6 and renewed.

In Figs. 7 and 8 or 9 and 10, further embodiments of the wheel brake according to fiction, are shown, in which the function of the return spring 5 is supported by a further return spring 5 '. In detail, these configurations are similar to those described above, but here the return spring 5 is arranged between the carrier plate and the brake shoes 2 . The return spring 5 is designed as a tension / compression spring and attached at one end to an extension of the slide rail 6 and with the other end to the brake shoe 2 . By moving the brake shoe 2 , this spring is compressed or pulled apart, whereby the spring force is built up. In addition to this return spring 5 , the exemplary embodiments shown have a further return spring 5 'which further supports this return function. This additional return spring 5 'is formed in the case of the embodiment shown in FIGS . 7 and 8 by a tension / compression spring, as is known in connection with the embodiment described in FIGS . 1 to 3, while in the case of as it was in connec together with the embodiment according to FIGS. 4 through 6 9 and 10, the zusätz Liche retainer spring 5 is formed 'by the bracket 7 itself embodiment of FIG..

Of course, a further embodiment of the wheel brake according to the invention can also have only the return springs 5 in the area of the brake shoes 2 , provided the spring force is sufficient. However, since this force does not have to be very high, this will usually be possible. Instead of the coil springs shown, torsion springs can also be used in the case of a pivotably mounted bracket 7 , which can be arranged in the region of the pivot bearing for the bracket 7 . An elastic mounting, for example in a rubber bearing of the bracket 7 , the reset function can be be. Finally, it is possible to design the sliding guide 6 so that the displacement movement of the brake shoes 2 is only possible against the elastic spring due to a rubber or rubber-like component which is arranged at the end of the displacement path of the brake shoes 2 .

Reference list

1

Actuating means

2nd

Brake shoe

3rd

wheel

4th

Wheel fork

5

,

5

'' Return spring

6

Slide rail

7

hanger

8th

Retaining pin

9

Cable
α Angle between the direction of displacement and the direction of rotation of the wheel
β wedge angle of the wedge-shaped brake shoe

Claims (21)

1. Wheel brake with at least two brake shoes ( 2 ), each on two opposite sides to a contact surface of a wheel ( 3 ) for generating a rotation of the wheel ( 3 ) counteracting braking force can be set via an actuating means ( 1 ), the Brake shoes ( 2 ) have a friction surface which is essentially parallel to the contact surface and the wheel ( 3 ) is mounted on a wheel fork ( 4 ), in particular formed by a handlebar fork or a frame area, characterized in that the brake shoes ( 2 ) are in a direction of displacement the wheel fork ( 4 ) are slidably mounted ver, the direction of displacement at an acute angle (α) to the tangent of the wheel ( 3 ) in the region of the contact surface ver. 2. Wheel brake according to claim 1, characterized in that the Bremsbac ken ( 2 ) are arranged at least with part of the friction surface between the wheel fork ( 4 ) and the wheel ( 3 ). 3. Wheel brake according to claim 1 or 2, characterized in that the brake shoes ( 2 ) are wedge-shaped with one of the wedge angles (β), the wedge angle (β) in its amount being substantially equal to the angle (α) and the angle (α) is less than 45 °, in particular less than 30 °. 4. Wheel brake according to one of claims 1 to 3, characterized in that to form an automatically releasing brake which is parallel to the plane of the wheel ( 3 ) component of the displacement direction of the brake shoes ( 2 ) of the direction of rotation of the wheel ( 3 ). 5. Wheel brake according to one of claims 1 to 3, characterized in that to form a self-locking brake to the level of the wheel ( 3 ), the brake shoes ( 2 ) are mounted such that the parallel component of the direction of displacement of the brake shoes ( 2 ) in Direction of rotation of the wheel ( 3 ). 6. Wheel brake according to one of the preceding claims, characterized in that the actuating means ( 1 ) from a substantially in the direction of shift pivotable on the wheel fork ( 4 ) arranged lever gebil det, which is connected to the brake shoes ( 2 ) and via a Handle or a manually or foot-operated lever gear is pivotable against the force of a return spring ( 5 ). 7. Wheel brake according to claim 6, characterized in that the lever is designed as the wheel ( 3 ) encircling bracket ( 7 ), the two ends are each pivotally mounted on a branch of the wheel fork ( 4 ) and bake with the brake ( 2 ) interacts on both sides of the wheel ( 3 ). 8. Wheel brake according to one of the preceding claims, characterized in that the brake shoes ( 2 ) are each guided on a conically arranged to the direction of rotation of the wheel, firmly connected to the fork slide rail ( 6 ). 9. Wheel brake according to claim 8, characterized in that the guide of the brake shoes ( 2 ) in the slide rail ( 6 ) is formed by a tongue and groove connection. 10. Wheel brake according to one of claims 6 to 9, characterized in that the return spring ( 5 ) is designed as a tension or compression spring, with one end on the slide rail ( 6 ) and with the opposite end on one of the brake shoes ( 2nd ) is attached in such a way that a potential spring force is built up by the displacement of the brake shoes ( 2 ) in the displacement direction and this spring force is reduced again by displacement in the opposite direction. 11. Wheel brake according to claim 7 or according to claim 7 and one of Ansprü che 8 to 10, characterized in that the brake shoes ( 2 ) directly or via a push rod on the bracket ( 7 ) in the direction of displacement gela Gert. 12. A wheel brake according to claim 11, characterized in that the mounting of the brake shoes ( 2 ) on the bracket ( 7 ) is formed by two retaining pins ( 8 ) ge, which is perpendicular to the bracket ( 7 ) from one of the bracket ( 7 ) protrude the end of the brake shoes ( 2 ) in front of and behind the bracket ( 7 ). 13. Wheel brake according to one of claims 7 to 12, characterized in that the return spring ( 5 ) is arranged between the bracket ( 7 ) and the wheel fork ( 4 ) or a frame of the vehicle to be braked with the wheel brake and directly on the bracket ( 7 ) works. 14. Wheel brake according to one of claims 7 to 13, characterized in that the bracket ( 7 ) below the brake shoes ( 2 ) on the wheel fork ( 4 ) is gela gert and the actuating means ( 1 ) in the upper region of the bracket ( 7 ) takes hold. 15. Wheel brake according to one of the preceding claims, characterized in that the actuating means ( 1 ) is formed by a cable ( 9 ). 16. Wheel brake according to one of claims 6 to 14 and claim 15, characterized in that the cable ( 9 ) at one of the pivot bearing abge facing point is connected to the lever and the wheel fork ( 4 ) has a force deflection for the cable ( 9 ) , The lever being pullable against the force of the return spring ( 5 ) against the wheel fork ( 4 ) via the cable pull ( 9 ) and movable back into its initial position by the return spring ( 5 ) when the cable pull ( 9 ) is relaxed. 17. Wheel brake according to one of claims 1 to 5 and claim 15, characterized in that the wheel fork ( 4 ) has at least one, arranged essentially in the plane of the displacement direction on the first force deflection and the deflected by the first force deflection cable ( 9 ) un acts indirectly on the brake shoes ( 2 ). 18. Wheel brake according to claim 17, characterized in that the wheel fork ( 4 ) has at least a second force deflection, each of the brake shoes ( 2 ) in the direction of displacement at each of the two ends with egg nem end of the cable ( 9 ) and the return spring ( 5 ) acts on the actuating means ( 1 ) interacting with the cable ( 9 ). 19. Wheel brake according to one of claims 7 to 18 and claim 6, characterized in that the return spring ( 5 ) is formed by the bracket ( 7 ) which is designed as an elastic bending element. 20. Wheel brake according to claim 19, characterized in that the bracket ( 7 ) at its point of application of the actuating means ( 1 ) applied En de to define the bending area has an eyelet or loop-like loading area with one or more spring windings and is made of spring steel ge is. 21. Wheel brake according to claim 19 or 20, characterized in that it has in addition to the first return spring ( 5 ) at least a second return spring ( 5 ') which acts directly on the brake shoe ( 1 ).