WO2014198312A1

WO2014198312A1 - Braking and immobilizing brake device for a wheeled chair frame such as a children's pushchair

Info

Publication number: WO2014198312A1
Application number: PCT/EP2013/062185
Authority: WO
Inventors: Bernd Fischer
Original assignee: Abc Design Gmbh
Priority date: 2013-06-12
Filing date: 2013-06-12
Publication date: 2014-12-18
Also published as: DE112013007164A5

Abstract

The invention relates to a braking and immobilizing brake device for a wheeled chair frame (10) such as a children's pushchair, comprising a drum brake (26) and a brake actuation handle (20) for moving a control element (60) of said drum brake (26). The brake shoe (44) of the drum brake (26) can be moved in a radially outward-pointing first direction proceeding from a central position, until a braking position is reached where a frictional surface (54) frictionally engages with the inner circumferential surface (50) of the drum wall (40), and can be moved in a second direction counter to said first direction, until an immobilizing position is reached in which a brake shoe inner toothing (76) that may be brought into engagement with the outer toothing (80) of a blocking element (42) in order to stop said blocking element (42) causes immobilization.

Description

Abbrems- and parking brake device for a sliding carriage rack, such. B. a stroller

The invention relates to a braking and parking brake device for a sliding carriage frame. This sliding carriage can be, for example, a child or doll carriage, a wheelchair, a golf cart, a luggage or shopping cart, a walker (rollator), a hand-wheeled device with wheels, a hand-portable industrial truck or the like. act to slide small vehicle. The main application of the braking and parking brake device according to the invention, however, is a stroller. In the aforementioned sliding carriage racks, it is known to provide braking systems. Here, in addition to braking systems and parking brake systems are generally used, distributed on different units, which are arranged on the sliding carriage rack. From DE 20 2010 015 238 U and GB 690 303 A stroller with, for example, drum brakes are known, without additionally parking brake systems would be available. Another example of a brake for a stroller with friction lining is known from DE 203 08 670 U and GB 2 433 968 A. Manually or automatically actuated parking brakes for prams or the like. Slide carriage racks are each known from EP 2 106 986 A, EP 1 627 794 A, DE 199 13 293 A, DE 10 2008 050 946 A, DE 299 01 834 U, and DE 20 2012 100 949 U.

The known sliding carriage racks thus have either braking devices or parking brake devices or both, wherein in the latter case various separately executed Bremssyteme for Use come. This increases the engineering and assembly costs, which makes the sliding carriage racks more expensive to produce.

The object of the invention is to provide a braking device for a Schiebewagenge- stell, in particular for a stroller, which allows the realization of the Abbrems- and the locking function using the same brake elements.

To solve this problem, a deceleration and fixed parking brake device for a sliding carriage frame such. B. a stroller, proposed, which has:

a drum brake, which in turn is provided with

a cylindrical drum wall which can be coupled to a wheel of the sliding carriage frame and has an inner circumferential surface and a rotational axis,

at least one brake shoe arranged on a fixed carrier element and inside the drum wall, which outer side has a friction surface and an inner side facing the inner circumferential surface of the drum wall,

- The brake shoe, starting from a center position, in a radially outwardly facing first direction to a Abbremsposition for frictional engagement of the friction surface with the inner peripheral surface of the drum wall and in a direction opposite to the first direction, radially inwardly facing second direction to a solid Stellposition is movable and

wherein the brake shoe is biased in the locking position with a biasing force,

a control applied to the brake shoe, movable in two opposite directions control for movement of the brake pad against the biasing force in the Abbremsposition and release of the brake shoe for movement as a result of the biasing force in the locking position, one between the axis of rotation and the brake shoe arranged also coupled to the wheel of the sliding carriage frame blocking element with an outer side facing away from the axis of rotation, which faces the inside of the brake shoe and has an external toothing,

wherein the brake shoe has on its inner side engageable with the external teeth of the blocking element in engagement internal teeth for locking the blocking element in the locking position of the brake shoe, and

- One with the control in kinematic operative connection brake operating handle for moving the control.

In the deceleration and parking brake device according to the invention, the at least one brake shoe of a drum brake is used both for the deceleration function and for the parking brake function. For this purpose, the at least one brake shoe on two opposite sides, of which one with a friction surface and the other with a toothing or the like. Surface structure is provided. In the following it is assumed that the friction surface on the outer side of the brake shoe and the toothing of the brake shoe on the inside (internal toothing) is arranged.

The device according to the invention comprises a drum brake with a drum rotating with the wheel to be braked, within which drum wall at least one brake shoe is arranged. Within the drum wall there is also a blocking element which also rotates with the wheel. Between the blocking element and the drum wall so there is at least one brake shoe. Typically, the drum brake of the device according to the invention is designed with two brake shoes.

The brake shoe is connected via a cam control element starting from a middle position in the direction of the drum wall and in frictional engagement with the inner side of the brake shoe. nenseite the drum wall movable. This movement takes place upon actuation of a brake actuation handle which is arranged on the sliding carriage frame (as a rule on the slide bracket itself) and which is in kinematic operative connection with the control element (usually via a Bowden cable). When the brake operating handle is actuated (for example, in the direction of the slider bar) starting from an initial position in one of two opposite directions, the friction surface of the at least one brake shoe frictionally engages the drum wall. When the brake operating handle is released, the brake shoe automatically returns to its center position due to a preload. If the brake operating handle is then released in such a way that it can be moved in the other direction starting from its starting position, then the at least one brake shoe moves away from the drum wall in the direction of the blocking element and into meshing engagement therewith, for which purpose the blocking element toothing of the at least one brake shoe opposite outer toothing. The control is correspondingly movable for this purpose to allow the movement of the brake shoe in meshing engagement with the blocking element. In the event that the sides of the brake shoe with the friction surface and the toothing are reversed, so the outside of the brake shoe (outer) toothing and thus the inside has the friction surface, according to the invention, the drum wall of the drum brake inside, so closer to the rotation axis as the blocking element, which is arranged outside of the brake shoe. This according to the principle of kinematic reversal representing alternative embodiment of the braking device according to the invention is encompassed by the invention.

In the inventive concept, therefore, the brake shoe or each brake shoe is used for two functions, namely for the Abbrems- and for the parking brake function. As a result, the combination brake device According to the invention, a reduced number of items, which has a positive effect on the manufacturing costs and assembly.

In an advantageous embodiment of the invention, it is provided that the brake senvorgang handle between a starting position and a Abbremsposition is movable and that an unlockable and automatically re-lockable locking unit is provided, the brake operating handle in the locked state in the starting position against an automatic movement opposite to the deceleration over holds the starting position out, the brake operating handle upon unlocking the locking unit is automatically converted by a movement opposite to the Abbremsposition in a locked position, and that the locking unit automatically assumes its locked state upon movement of the brake operating handle from the locking position to the starting position. Furthermore, it may be provided that the locking unit must be unlocked (and, for example, manually), when the brake operating handle is to be transferred from the locking position back to the starting position, the parking brake function is thus canceled. In a further advantageous embodiment of the invention can be provided that the brake operating handle is biased toward its locking position. This is done by an integrated in the brake lever handle spring element. Further, the bias may be assisted in the locked position by the biasing force acting on the at least one brake shoe.

In a further advantageous embodiment of the invention, the kinematic operative connection of the brake actuating handle is realized with the control by a Bowden cable with a soul and a guide sleeve. Other kinematic active compounds such as, for example, a linkage and hydraulic or pneumatic designs are also conceivable. Also, electrical variants with the result that the brake device then works electromechanically, electropneumatically or electro-hydraulically, are also conceivable. Conveniently, the brake shoe is arcuate and has the brake shoe on two opposite ends, wherein the brake shoe is pivotally mounted at its first end and wherein the control for pivoting the brake shoe against the biasing force and to release an automatic pivoting of the brake shoe as a result of the biasing force on the second end of the brake shoe is applied. It should be noted that the at least one brake shoe or the brake shoes can also be moved linearly or moved and guided.

As already mentioned above, it is typically the case that the brake device has two opposing brake shoes (which can be biased against each other with biasing force). In this case, a biasing force element (one or more springs) between two brake shoes act directly.

In a further advantageous embodiment of the invention, the blocking element is designed as a particular closed, circumferential cylinder wall with an external or internal toothing. In this case, the cylinder wall of the blocking element extends in particular concentrically to the drum wall.

As already mentioned above, the brake device according to the invention has a cam control element for moving the at least one brake shoe or the two opposite brake shoes. This control expediently has a cam in the form of a distance rod element with two longitudinal side surfaces facing away from each other and two rounded opposite ends, wherein the spacer rod element is arranged at the second end of the brake shoe or between the second ends of the two brake shoes, wherein the control about a between the two rounded ends of the distance-rod member and the two Längsseiten- surfaces and parallel to this axis of rotation is rotatable, depending on the rotational position of the distance-rod member a longitudinal side surface or the transition of a longitudinal side surface to a rounded End or even a rounded end even at the second end of the brake shoe or in each case a longitudinal side surface or a rounded end abuts the second ends of both brake shoes or abut.

An embodiment of the invention will be explained in more detail with reference to the drawing. In detail, they show:

Fig. 1 shows a perspective view of an exemplary pushcart frame in the form of a stroller frame with a braking system according to the invention,

Fig. 2 shows a vertical section through the braking device on one or each rear wheel of the stroller frame according to FIG. 1, the braking device being shown in its position in which it neither slows down nor determines the wheel;

Fig. FIG. 3 shows a representation of the function of the brake actuation grip when the function of the brake device according to FIG. 2,

Fig. FIG. 4 shows a vertical section through the brake device on one or each rear wheel in the function for braking the rear wheel, FIG.

Fig. FIG. 5 shows the position of the brake actuation handle for realizing the deceleration function, a vertical section through the brake device on each rear wheel, in its parking brake function, FIG.

Fig. 7 shows the associated position of the brake operating handle according to the braking function of FIG. 6 and Fig. 8 shows a section through the brake device on each rear wheel of the baby carriage according to FIG. 1 according to the line XIII-XIII of FIG. 2. In Fig. 1 is a perspective view of a stroller (sliding carriage) frame 10 ge ^¬ shows that has a lower frame 12 with rear wheels 14 and front wheels 16. The preferably collapsible sliding carriage frame 10 has a handlebar 18 with a Bremsenbetätigungsg riff 20, which has a protruding from the handlebar 18 housing 22 with a pivotable (hand) lever 24. The Bremsenbetätig ungsg riff 20 is operatively connected via Bowden cables with drum brakes 26 on both rear wheels 14. In Fig. 1 is on the shown from the Schiebewagengestel l led out En ^¬ de of the guide sleeve 28 with core 30 of the Bowden cable 32 one of the two rear wheels 14, the guide sleeve 28 of impact on a Festan- rests 33 and the core 30 of the Bowden cable 32 on a lever 34 of the drum brake 26 attacks.

The structure of a drum brake 26 is shown in FIGS. 2, 4, 6 and 8 shown in more detail, wherein the brake in the Fign. 2, 4 and 6 in different Stel lungs and functions is shown, while Fig. 8 shows a section through the drum brake 26.

In the representation according to FIG. 2, the drum brake 26 is in its inactive state, in which it neither slows down nor fixes the rear wheel. The drum brake 26 has a drum 14, which rotates with the rear wheel 14 and has a cylindrical drum wall 40 which is concentric with the axis of rotation 38 of the rear wheel 14 is. Near the axis of rotation 38, the Trom ^¬ mel brake 26, an at least partially hollow-cylindrical blocking member 42. The blocking element 42 is concentric with the drum wall 40. Between the blocking element 42 and the drum wall 40 there are two brake shoes 44, which are of arcuate design. Each brake shoe 44 has a carrier body 46 with a held by this Friction lining 48 on which the inner peripheral surface (inside) 50 of the drum wall 40 facing Au ßenseite 52 has a friction surface 54. The two arcuate brake shoes 44 are pivotally mounted at one of its ends about a pivot axis 56 on a support member 57 (see FIG. 8), while between the two other, opposite ends 58 of the two brake shoes 44, a cam control element 60 is rotatable about an axis 61 and connected to the lever 34 on which the core 30 of the Bowden cable 32 engages. The cam control element 60 has, as a cam, a distancing rod element 62 which, upon rotation of the cam control element 60, acts on the ends 58 of the brake shoes 44 (with respect to rotation in the clockwise direction - relative to the representation in FIG Fig. 2) move apart (with pivoting of the two brake shoes 44 to the pivot axis 56) to allow the brake shoes 44 at Verd counterclockwise rotation to move toward each other (due to the Vorspannfe- 64). The spacer bar element 62 has two longitudinal side surfaces 66 and two preferably rounded ends 68.

In the non-braking function shown in FIG. 2, the brake operating handle 20 assumes the starting position as shown in FIG. 3, in which the hand lever 24 is in a position in which it can be grasped when detecting the handlebar 18 by hand with your fingers. Is now pulled on the hand lever 24, d. H . If the hand lever 24 is moved towards the push bar 18 (see FIG. 5), then the Bowden cable 32 is pulled, with the result that the lever 34 is pivoted in the direction of the arrow 70 via the core 30, whereby the cam Control 60 is rotated and the brake shoes 44, starting from their center positions shown in FIG. 2, be disengaged. The friction surfaces 54 48 come into frictional engagement of the friction with the inner circumferential surface 50 of the drum wall 40, the rear wheel is wod urch 14 abge ^¬ brakes. The more lever 24 is pulled on the hand, the stronger the braking effect. Subsequently, the hand lever 24 is released, it takes automatic ^¬ table again to its initial position of FIG. 3 again and the brake is released, so that the rear wheel 14 can run free again. The Rückbewe ^¬ tion of the hand lever 24 in the starting position d urch by the biasing spring 64 between the two brake shoes 44 and d urch by a (not shown) additional biasing spring (eg, leg spring) in the housing 22 of the Bremsenbetätigungsg 20 riffs supported.

To Ü the transfer of the drum brake 26 in their parking brake function, a locking unit 72 is actuated, in which d in this embodiment, a release button 73 (see Fig. 1) of the brake operating handle 20 down ^¬ ged is moved or al very outwardly withdrawn hand lever 24 is unlocked so that he is aware of his starting position as shown in Figs. 1 and 4 also automatically in a Feststel lposition shown in FIG. 7 moves (see Fig. 7). In this position, the lever 34 has from its position shown in FIG. 2 in the direction of arrow 74 in the position shown in FIG. 6 moves. As a result, the cam control element 60 has ver so that its rod-shaped spacer rod member 62 flat between the gegenüberlieving ends 58 of the two brake shoes 44 ie, the brake shoes so on the two longitudinal side surfaces 66 of the spacer rod member 62 anl hey , Thus, the distance between the two ends 58 of the brake shoes 44 is minimal, so that the two brake shoes are moved towards each other maximum, which in turn is caused by the biasing spring 64, the hitherto (due to the addition of length of the core 30 of the Bowden cable 32nd ) on the brake shoes 44 d the Verd tion of the cam control element 60 and thus the pivoting of the lever 34 has "allowed". In this situation, an internal gear 76 engages the inner sides 78 of the carrier body 46 of the brake shoes 44 in a corre sponding external teeth 80 on the outside 82 of the blocking element 42 and locks the relevant rear wheel 14. Thus, the drum brake 26 is in its locking position. The Innenverzahn 76 does not necessarily have to be formed on both brake shoes 44; it is enough for the detection function, if only one of the brake shoes 44 cooperates via an internal toothing 76 with an external toothing 80 of the blocking element 42.

By swinging the hand lever 24 backward out of the locking position, FIG. 7 to the starting position according to FIGS. 1 and 3 (possibly depressing the release button 73), the drum brake 26 returns to its free-running state shown in FIG. 2, in which the brake shoes 44 are in their middle positions. As soon as the hand lever 24 returns to its initial position according to FIGS. 1 and 3, the unlocking button 73 locks automatically, so that the hand lever 24 can not unintentionally move back into the locking position. Now the drum brake can be used again in its function to decelerate the rear wheel 14.

Fig. 8 shows the drum brake 26 in longitudinal section.

List of prizes Stroller (sliding table) frame, sliding carriage frame

rear wheels

front wheels

push bar

Brake actuation handle

Housing of the brake operating handle

Hand lever of the brake operating handle

drum brake

guide sleeve

soul

Bowden

fixed stop

hand lever

drum

axis of rotation

Drum wall of the drum

blocking element

brake shoe

Carrier body for friction lining

friction lining

Inner peripheral surface of the drum wall

Outside of the drum wall

friction surface

Swivel axis of the brake shoes

support element

Ends of the brake shoes

Cam control

axis

Distance rod member

biasing spring

Longitudinal side surfaces of the distance rod element

Ends of the distance bar element

movement arrow

blocking unit

release button

movement arrow

internal gearing

inside

external teeth

outside

Claims

claims

1. Abbrems- and parking brake device for a sliding carriage frame (10), such as. As a stroller, with

a drum brake (26) provided with

a cylindrical drum wall (40) which can be coupled to a wheel (14) of the sliding carriage frame (10) and has an inner peripheral surface (50) and an axis of rotation (38),

at least one brake shoe (44) arranged on a fixed support element (57) and inside the drum wall (40), which outer side (52) facing the inner peripheral surface (50) of the drum wall (40) has a friction surface (54) and an inner side (78 ) having,

wherein the brake shoe (44), starting from a center position, in a radially outward first direction to a Abbremsposition for frictional engagement of the friction surface (54) with the inner peripheral surface (50) of the drum wall (40) and in a direction opposite to the first direction, radially inwardly facing second direction is movable to a locking position and wherein the brake shoe (44) is biased in the locking position with a biasing force,

one on the brake shoe (44), movable in two opposite directions (60) for movement of the brake shoe (44) against the biasing force in the Abbremsposition and release of the brake shoe (44) for movement as a result of the biasing force in the locked position,

one between the rotational axis (38) and the brake shoe (44) also arranged with the wheel (14) of the sliding carriage frame (10) coupled to the blocking element (42) with an axis of rotation (38) facing away from the outside (52), the inside of the brake shoe ( 44) faces and has an outer toothing (80), wherein the brake shoe (44) on its inner side (78) with the outer toothing (80) of the blocking element (42) engageable internal toothing (76) for locking the blocking element (42) in the locking position of the brake shoe (44), and

a brake operating handle (20) in kinematic engagement with the control member (60) for movement of the control member (60).

A braking and parking brake device according to claim 1, characterized in that the brake operating handle (20) is movable between a home position and a braking position and that an unlockable and automatically re-lockable locking unit (72) is provided, the brake operating handle (20) in the locked state in the initial position against an automatic movement opposite to the Abbremsstellung beyond the initial position holds, the brake operating handle (20) upon unlocking the locking unit (72) automatically by a movement opposite to the Abbremsposition in a locked position can be transferred, and that the locking unit (72) at a Movement of the brake operating handle from the locking position to the starting position automatically assumes its locked state.

Braking and locking device according to claim 2, characterized in that the brake operating handle (20) is biased in its initial position and in its locking position.

Braking and locking device according to one of claims 1 to 3, characterized in that the brake actuating handle (20) with the control element (60) by means of a Bowden cable (32) with a core (30) and a guide sleeve (28) is coupled. Deceleration and locking device according to one of claims 1 to 4, characterized in that the brake shoe (44) is arcuate and has two opposite ends (58), wherein the brake shoe (44) is pivotally mounted at its first end and wherein the control (60) at the second end (58) of the brake shoe (44) for pivoting the brake shoe (44) against the biasing force and for releasing an automatic pivoting of the brake shoe (44) rests in consequence of the biasing force.

Braking and locking device according to one of claims 1 to 5, characterized in that two opposite brake shoes (44) are provided, which are biased against each other with biasing force.

Abbrems- and locking device according to one of claims 1 to 6, characterized in that the blocking element (42) has a particular closed circumferential or partially cylindrical wall with an outer toothing (80).

Deceleration and locking device according to claim 7, characterized in that the cylinder wall of the blocking element (42) is concentric with the drum wall (40).

Braking and locking device according to one of claims 1 to 8, characterized in that the control element (60) has a cam in the form of a distance rod member (62) with two longitudinal side surfaces (66) facing away from each other and two rounded opposite ends (68), in that the distance rod element (62) is arranged at the second end of the brake shoe (44) or between the second ends (68) of the two brake shoes (44) and in that the control element (60) extends around one of the two rounded ends (68 ) of the spacer rod element (62) and the two longitudinal side surfaces (66) and parallel to this axis of rotation (38) is rotatable, wherein in dependence from the rotational position of the distance rod member (62) has a longitudinal side surface (66) or the transition of a longitudinal side surface (66) to a rounded end (68) or a rounded end (68) even at the second end of the brake shoe (44) or in each case a longitudinal side surface (66) or the transition of a longitudinal side surface (66) to a rounded end (68) or a rounded end (68) at the second ends of both brake shoes (44) rests or abut.