EP3609451B1 - Wheelchair device for actively moving a seat unit of a wheelchair - Google Patents

Description

State of the art

The invention relates to a wheelchair device for actively moving a seat unit, in particular a seat part and / or a backrest part of the seat unit, of a wheelchair according to claim 1.

In DE 10 2012 021 592 A1 a wheelchair device has already been proposed for an active movement of a seat unit, in particular a seat part and / or a backrest part of the seat unit, of a wheelchair, which comprises at least one movement conversion unit which can be arranged at least partially on at least one drive wheel of the wheelchair and which is provided to a movement of the to convert at least one drive wheel into a movement of the seat unit.

In JP 2016 106875 A a wheelchair device for an active movement of a footrest has already been proposed, the wheelchair device comprising at least one movement conversion unit which is provided to convert a movement of at least one drive wheel into a movement of the footrest.

It is also off US 2010/090436 A1 a wheelchair device for actively moving a footrest of a wheelchair is already known, the wheelchair device comprising at least one movement conversion unit which can be arranged at least partially on at least one drive wheel of the wheelchair and which is intended to convert a movement of the at least one drive wheel into a movement of the footrest. The movement conversion unit is designed as a cam gear unit, the movement conversion unit having at least one movably mounted cam gear element which can be arranged on the footrest and which has at least one contact surface that can be arranged on the footrest, at least for an action on the footrest at least one motion guide track of at least one further cam gear element of the motion conversion unit, which is designed as a cam disk and on which at least one drive wheel can be arranged.

Furthermore are off WO 2014/000115 A1 and EP 2 727 568 A1 also already known wheelchair devices.

The object of the invention is in particular to provide a generic wheelchair device with improved properties with regard to a structurally simple design and / or convenient retrofitting. The object is achieved according to the invention by the features of claim 1, while advantageous configurations and developments of the invention can be found in the subclaims.

Advantages of the invention

The invention is based on a wheelchair device for an active movement of a seat unit, in particular a seat part and / or a backrest part of the seat unit, of a wheelchair, with at least one movement conversion unit which can be arranged at least partially on at least one drive wheel of the wheelchair and which is provided to a movement of the to convert at least one drive wheel into a movement of the seat unit, the movement conversion unit being designed as a cam gear unit, the movement conversion unit having at least one movably mounted cam gear element which can be arranged on the seat part and which has at least one contact surface that connects with at least one Motion guide track of at least one further cam gear element of the movement conversion unit interacts, the movement conversion unit having at least the further cam gear element, which is designed as a cam disk et is and on which at least one drive wheel can be arranged.

It is proposed that the movement guide path of the further cam gear element is arranged on an inside of the further cam gear element facing a hub of the at least one drive wheel. A "cam gear unit" is to be understood in particular as a unit which is provided to implement a rotary drive or a translational drive of a further cam gear element that is rotatably or translationally mounted depending on the scanning of at least one rotatably mounted or translationally mounted cam gear element. “Provided” is to be understood in particular to be specially designed and / or specially equipped. The fact that an element and / or a unit is provided for a specific function should be understood in particular to mean that the element and / or the unit fulfills and / or executes this specific function in at least one application and / or operating state. The movement conversion unit, in particular at least one cam gear element of the movement conversion unit, can preferably be arranged, in particular arranged, at least partially on a frame or on a frame of the wheelchair. The movement conversion unit, in particular at least one further cam gear element of the movement conversion unit, can preferably be arranged, in particular arranged, at least partially on the at least one drive wheel of the wheelchair. The A movement conversion unit is preferably provided to convert a rotational movement of the at least one drive wheel into a movement of the seat unit about a movement axis of the seat unit which is at least substantially perpendicular to an axis of rotation of the at least one drive wheel. The The term "essentially perpendicular" is intended here to define in particular an alignment of a direction relative to a reference direction, the direction and the reference direction, particularly viewed in a projection plane, enclosing an angle of 90 ° and the angle including a maximum deviation of, in particular, less than 8 ° , advantageously less than 5 ° and particularly advantageously less than 2 °. The axis of movement of the seat unit can run at least substantially perpendicularly or at least substantially parallel to a seat surface of the seat unit. "Essentially parallel" is to be understood here in particular as an alignment of a direction relative to a reference direction, in particular in a plane, the direction having a deviation from the reference direction of in particular less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 °. The movement conversion unit is preferably provided to drive the seat unit in an oscillating manner about the axis of movement, in particular as a function of a rotational movement of the at least one drive wheel about the axis of rotation of the drive wheel. The wheelchair device is preferably attachable to the wheelchair when a wheelchair is manufactured. However, it is also conceivable that the wheelchair device is designed as a retrofit kit that can be mounted on an already existing wheelchair, in particular in order to equip the existing wheelchair with the wheelchair device according to the invention after manufacture. By means of the configuration according to the invention, a structurally simple configuration of the wheelchair device can advantageously be implemented in order to actively drive the seat unit. A rotational movement of the at least one drive wheel can advantageously be used in a structurally simple manner in order to realize an active movement of the seat unit. A convenient retrofitting of a wheelchair with the wheelchair device according to the invention can advantageously be realized, in particular with little effort.

The cam gear element is preferably movably mountable on the frame or on the frame of the wheelchair, in particular mounted. Preferably, the cam gear element can be pivoted, in particular mounted, on the frame or on the frame of the wheelchair. A pivot axis of the cam gear element preferably runs at least substantially parallel to the axis of rotation of the at least one drive wheel. However, it is also conceivable for the cam gear element to be movable in translation on the frame or on the frame of the wheelchair can be stored, in particular stored. In the case of a translationally movable mounting of the cam gear element on the frame or on the frame of the wheelchair, it is conceivable that a linear movement axis of the cam gear element runs at least substantially perpendicular to the axis of rotation of the at least one drive wheel. The cam gear element preferably comprises at least one seat contact surface, by means of which the cam gear element can be placed, in particular, on the seat unit, in particular on the seat part. The seat contact surface is preferably provided to lie against the seat part on a side of the seat part facing away from a seat surface of the seat part. Alternatively or additionally, the cam gear element can be fixed, in particular fixed, in particular by means of a form-fitting and / or force-fitting connection, at least one end to the seat unit, in particular to the seat part of the seat unit. The further cam gear element can preferably be arranged, in particular arranged, in a rotationally fixed manner on the at least one drive wheel. The further cam gear element is preferably rotatable together with the at least one drive wheel about the axis of rotation of the drive wheel. The movement guide path preferably forms an outer surface of the further cam gear element. The movement guide track of the further cam gear element is preferably arranged on an inside of the further cam gear element facing a hub of the at least one drive wheel. However, it is also conceivable that the movement guide track is designed as a groove that is introduced into the further cam gear element or is designed as a rib-shaped guide extension that is attached to the further cam gear element, in particular is designed in one piece with the further cam gear element. By means of the embodiment according to the invention, a rotational movement of the at least one drive wheel can advantageously be used in a structurally simple manner in order to realize an active movement of the seat unit. A convenient retrofitting of a wheelchair with the wheelchair device according to the invention can advantageously be realized, in particular with little effort.

Furthermore, it is proposed that the movement conversion unit has at least one cam gear element on which at least one friction-reducing element, in particular a rolling element, of the movement conversion unit is arranged, which interacts with a movement guide path of the movement conversion unit, in particular at least one other Cam gear element of the motion conversion unit is provided. The friction-reducing element can form the contact surface of the cam gear element, which interacts with the movement guide path of the further cam gear element. The friction-reducing element can be designed as a sliding surface element which is provided to slide along the motion guide path when the further cam gear element moves relative to the cam gear element, or the friction-reducing element can be a movably mounted rolling element, such as a roller, a roller, an outer ring of a rolling bearing or the like The like, which is provided to roll on the movement guide path when the further cam gear element moves relative to the cam gear element. The friction-reducing element is preferably arranged at a further end of the cam gear element which faces away from the end of the cam gear element with which the cam gear element can be fixed, in particular fixed, on the seat unit, in particular the seat part. By means of the embodiment according to the invention, low-friction scanning of the movement guide path for an active movement of the seat unit can advantageously be implemented. A rotational movement of the at least one drive wheel can advantageously be used in a structurally simple manner in order to realize an active movement of the seat unit.

It is also proposed that the movement conversion unit have at least one, in particular further, cam gear element which can be arranged, in particular, is arranged on the at least one drive wheel and has at least one movement guide path which has a non-circular, in particular oval or elliptical course. The term "non-circular" is intended to define, in particular, a geometric configuration that is different from an exact circle and is at least substantially free of edges or corners, such as an ellipse, an oval or the like. The further cam gear element is preferably configured in the shape of a circular ring, wherein an inner edge and / or inner surface of the further cam gear element, in particular at least partially delimiting and / or forming the movement guide path, has a non-circular, in particular oval or elliptical, course. The inner edge and / or the inner surface of the further cam gear element is also on the side facing the hub of the at least one drive wheel Cam gear element arranged. The inner edge and / or the inner surface of the further cam gear element preferably delimits a recess which has a non-circular, in particular oval or elliptical, outer contour. The recess is preferably delimited by the movement guide path. The inner surface of the further cam gear element preferably runs at least substantially parallel to the axis of rotation of the at least one drive wheel. By means of the embodiment according to the invention, a curved path can be implemented in a structurally simple manner, which can be used to control the cam gear element for an active movement of the seat unit. A rotational movement of the at least one drive wheel can advantageously be used in a structurally simple manner in order to realize an active movement of the seat unit.

It is further proposed that the movement conversion unit has at least one rocker element which forms at least one cam gear element of the movement conversion unit. The rocker element preferably forms the cam gear element, which can be fixed, in particular fixed, with one end to the seat unit, in particular to the seat part of the seat unit. The rocker element is preferably movable around the pivot axis of the cam mechanism element, in particular in an oscillating manner around the pivot axis, as a function of a rotational movement of the at least one drive wheel and of an interaction between the friction reducing element arranged on the cam gear element designed as a rocker element and the movement guide track of the further cam gear element arranged on the at least one drive wheel of the cam gear element movably mounted. The oscillating movement of the cam gear element can preferably be transmitted to the seat unit, in particular the seat part, as a result of the cam gear element being fixed on the seat unit, in particular on the seat part. By means of the configuration according to the invention, a rotational movement of the at least one drive wheel can be used in a structurally simple manner in order to realize an active movement of the seat unit. An oscillating movement of the seat unit can advantageously be brought about.

It is also proposed that the movement conversion unit have at least one cam gear element which has at least one movably mounted pick-up element. The movably mounted pick-up element is preferably movable mounted rolling element, in particular as a roller, as a wheel, as a ball bearing or the like. The movably mounted pick-up element is preferably designed as a movably mounted rolling element which is rotatably mounted on the cam gear element designed as a rocker element. The pick-up element is preferably arranged on the other side of the cam gear element which faces away from the side of the cam gear element with which the cam gear element can be fixed, in particular fixed, on the seat unit, in particular on the seat part of the seat unit. The pick-off element is preferably rotatably mounted on the cam gear element by means of the friction-reducing element designed as a roller bearing. The pick-off element preferably forms the contact surface of the cam gear element. It is also conceivable that the pick-off element and the friction-reducing element are at least partially formed in one piece. By means of the embodiment according to the invention, a component-friendly scanning of the movement guide path of the further cam gear element can advantageously be implemented. A rotational movement of the at least one drive wheel can be used in a structurally simple manner in order to realize an active movement of the seat unit. An oscillating movement of the seat unit can advantageously be brought about.

The further cam gear element can preferably be arranged, in particular fixed, on the at least one drive wheel together with a fixing unit fixing a hand rim of the at least one drive wheel. The further cam gear element designed as a cam disk can preferably be arranged on a side of the at least one drive wheel facing the frame or the frame of the wheelchair. By means of the configuration according to the invention, a compact arrangement of the further cam gear element on the at least one drive wheel can advantageously be made possible. Components that are already present and / or installation space that is already present can advantageously be used for an arrangement of the further cam gear element. A convenient retrofitting of a wheelchair with the wheelchair device according to the invention can advantageously be realized, in particular with little effort. Constructively it can be a simple one Rotational movement of the at least one drive wheel can be used to realize an active movement of the seat unit.

It is further proposed that the movement conversion unit has at least one spring element which is provided to apply a spring force to at least one cam gear element of the movement conversion unit. The spring element is preferably provided to apply a spring force to the cam gear element designed as a rocker element. The spring element is preferably provided to act on the cam gear element with a spring force acting in the direction of the further cam gear element. A "spring element" is to be understood in particular as a macroscopic element that has at least one extension that can be changed elastically in a normal operating state by at least 10%, in particular by at least 20%, preferably by at least 30% and particularly advantageously by at least 50% , and which in particular generates a counterforce which is dependent on a change in the extent and preferably proportional to the change and which counteracts the change. An “extension” of an element is to be understood as meaning, in particular, a maximum distance between two points of a perpendicular projection of the element onto a plane. A “macroscopic element” is to be understood in particular as an element with an extension of at least 1 mm, in particular of at least 5 mm and preferably of at least 10 mm. The spring element is preferably designed as a helical compression spring. However, it is also conceivable that the spring element has another configuration that appears sensible to a person skilled in the art, such as a configuration as a helical tension spring, as an evolute spring, as a plate spring, as a leg spring or the like be realized on the further cam gear element. It can advantageously be made possible for the pick-up element arranged on the cam gear element to rest securely on the movement guide path.

Furthermore, it is proposed that the wheelchair device comprises at least one activation unit, which is provided for the action of the movement conversion unit on the seat unit, in particular the seat part and / or the backrest part, in particular as a result of manual actuation by a Operator to activate or deactivate. The activation unit is preferably designed as a mechanical activation unit that can be operated manually by an operator. Preferably, at least one activation element, such as an activation lever or the like, can be manually operated, in particular moved, by an operator. The activation element is preferably provided, as a result of an actuation by an operator, to enable or block a transmission of movement of the cam mechanism element to the seat unit, in particular the seat part and / or the backrest part, in particular to allow the movement conversion unit to act on the seat unit, in particular the seat part and / or the backrest part to activate or deactivate. The activation element can be provided to enable or block a possibility of movement of the cam gear element. The activation element can alternatively or additionally be provided to enable or block a possibility of movement of the seat unit, in particular of the seat part and / or the backrest part. The activation element can be provided to actively move the cam gear element, in particular along and / or around an activation axis that is different from a movement axis, in particular a pivot axis, of the cam gear element along and / or around which the cam gear element acts on the seat unit , in particular on the seat part and / or the backrest part, is movably mounted. However, it is also conceivable that the activation unit is at least partially electronic and has at least one electronic component, such as an electronic actuator or the like. It is also conceivable that the activation unit has a communication unit which is provided for, in particular wirelessly, data with an external unit, such as a smartphone, a tablet, a PC or the like. to be exchanged, in particular via an application installed on the external unit, by means of which the electronic activation unit can be controlled. Further configurations of the activation unit that appear sensible to a person skilled in the art are also conceivable. By means of the embodiment according to the invention, an activation or deactivation of an active movement of the seat unit, in particular of the seat part and / or the backrest part, can advantageously be achieved. A high level of operator comfort can advantageously be made possible since an individual deactivation or activation of a function of the wheelchair device can be made possible.

In addition, a wheelchair, in particular a manually operated wheelchair, with at least one wheelchair device according to the invention is proposed. The wheelchair preferably comprises at least two rotationally movably mounted drive wheels, at least one drive unit which has at least one movably mounted lever element, in particular at least two movably mounted lever elements, which is / are provided at least for a manual drive of the drive wheels. The wheelchair preferably comprises at least one brake unit for acting on the drive wheels and at least one actuation unit which has at least one movably mounted steering actuation element, in particular arranged on the lever element, which is provided to trigger the brake unit in such a way that the drive wheels can be braked independently of one another , in particular to implement a steering function. The at least one lever element is preferably provided to drive the drive wheels by interacting with at least one gear unit of the drive unit. The gear unit and the at least one lever element preferably work together in such a way that a pivoting movement, in particular a reciprocating movement, of the at least one lever element can be converted into a rotational movement of the drive wheels by means of the gear unit. The wheelchair very particularly preferably comprises the at least one drive wheel on which at least the movement conversion unit of the wheelchair device is arranged, the movement conversion unit being designed separately from the gear unit for a rotating drive of the at least one drive wheel. The drive unit preferably comprises at least two movably, in particular pivotably, mounted lever elements. The at least two lever elements are preferably provided to drive the drive wheels by interacting with the gear unit. A movement of a single lever element of the at least two lever elements is preferably sufficient for a movement of the drive wheels via the gear unit. However, it is also conceivable that the gear unit is alternatively or additionally designed such that a, in particular alternating and / or counter-rotating movement of the at least two lever elements can be used for a synchronized movement of the drive wheels. The transmission unit preferably comprises at least one freewheel element which is provided to decouple the at least one lever element or the at least two lever elements from a movement of the drive wheels, in particular in order to return the at least one lever element or the at least two lever elements to an initial position realize. One of the at least two lever elements is preferably arranged on different sides of the wheelchair, in particular a seat part or the frame of the wheelchair. The at least two lever elements are preferably movably coupled to one another, in particular coupled to one another movably in opposite directions, preferably by means of the gear unit of the drive unit. When at least one of the lever elements is moved in one direction, at least another one of the lever elements can be moved in an opposite direction. The manually operated wheelchair is preferably designed to be operated by muscles. However, it is also conceivable that the wheelchair is decoupled from the at least one movably mounted lever element and can only be driven by the action of an operator force on the handrims arranged on the at least one drive wheel, or that the wheelchair has an electric drive unit to drive the drive wheels. By means of the configuration according to the invention, a structurally simple configuration of the wheelchair device can advantageously be implemented in order to actively drive the seat unit. A rotational movement of the at least one drive wheel can advantageously be used in a structurally simple manner in order to realize an active movement of the seat unit.

The wheelchair device according to the invention and / or the wheelchair according to the invention should / should not be limited to the application and embodiment described above. In particular, the wheelchair device according to the invention and / or the wheelchair according to the invention can have a number of individual elements, components and units that differs from a number of individual elements, components and units mentioned herein in order to fulfill a mode of operation described herein. In addition, in the case of the value ranges specified in this disclosure, values lying within the stated limits should also be deemed disclosed and can be used in any way.

drawings

Further advantages emerge from the following description of the drawings. In the drawings, an embodiment of the invention is shown. The drawings, the description and the claims contain numerous features in combination. The A person skilled in the art will expediently also consider the features individually.

Fig. 1

eine Frontansicht eines erfindungsgemäßen Rollstuhls mit einer erfindungsgemäßen Rollstuhlvorrichtung, wobei Stütz- und/oder Lenkräder des erfindungsgemäßen Rollstuhls nicht dargestellt sind, in einer schematischen Darstellung,

Fig. 2

eine Detailansicht einer Bewegungswandlungseinheit der erfindungsgemäßen Rollstuhlvorrichtung in einer schematischen Darstellung,

Fig. 3

eine Detailansicht der zumindest teilweise an einer Sitzeinheit des erfindungsgemäßen Rollstuhls angeordneten Bewegungswandlungseinheit in einer schematischen Darstellung,

Fig. 4

eine Detailansicht der Bewegungswandlungseinheit an dem erfindungsgemäßen Rollstuhl, wobei die Sitzeinheit abgenommen ist, in einer schematischen Darstellung und

Fig. 5

eine Detailansicht der zumindest teilweise an einem Gestell oder an einem Rahmen des erfindungsgemäßen Rollstuhls angeordneten Bewegungswandlungseinheit in einer schematischen Darstellung.

Show it:

Fig. 1

a front view of a wheelchair according to the invention with a wheelchair device according to the invention, wherein support and / or steering wheels of the wheelchair according to the invention are not shown, in a schematic representation,

Fig. 2

a detailed view of a movement conversion unit of the wheelchair device according to the invention in a schematic representation,

Fig. 3

a detailed view of the movement conversion unit arranged at least partially on a seat unit of the wheelchair according to the invention in a schematic representation,

Fig. 4

a detailed view of the movement conversion unit on the wheelchair according to the invention, wherein the seat unit is removed, in a schematic representation and

Fig. 5

a detailed view of the movement conversion unit arranged at least partially on a frame or on a frame of the wheelchair according to the invention in a schematic representation.

Description of the embodiment

Figure 1 shows a wheelchair 18 with at least one wheelchair device 10 for active movement of a seat unit 12 of the wheelchair 18, in particular a seat part 14 and / or a backrest part 16 of the seat unit 12. The wheelchair 18 is preferably designed as a manually operated wheelchair. However, it is also conceivable that the wheelchair 18 is designed as a motor-driven wheelchair. The wheelchair 18 is preferably designed such that an operator can drive the wheelchair 18 with the action of muscle power. The wheelchair 18 comprises at least two rotationally movably mounted drive wheels 20, 22, at least one drive unit 46, which has at least one movably mounted lever element 48, 50 which at least to a manual drive of the drive wheels 20, 22 is provided, in particular as a result of the action of muscle strength of the operator. The drive unit 46 preferably comprises at least two movably mounted lever elements 48, 50.

Furthermore, the wheelchair 18 comprises at least one brake unit 52 for acting on the drive wheels 20, 22 and at least one actuation unit 54, which has at least one movably mounted steering actuation element 56, 58, in particular arranged on the lever element 48, 50, which is provided for to trigger the braking unit 52 in such a way that the drive wheels 20, 22 can be braked independently of one another, in particular for realizing a steering function. The actuation unit 54 of the wheelchair 18 comprises at least one, in particular arranged on the lever element 48, 50, brake actuation element 60, 62 for actuation of the brake unit 52, with the drive wheels 20, 22 jointly by means of the brake unit depending on an actuation of the brake actuation element 60, 62 52 can be braked, in particular to reduce the speed of the drive wheels 20, 22 to a standstill.

The steering actuation element 56, 58 is rotatably and / or pivotably mounted on the lever element 48, 50. A movement axis 64, 66 of the at least one lever element 48, 50 runs transversely, in particular at least substantially perpendicularly, to a main axis of extension of the at least one lever element 48, 50. The at least one brake actuation element 60, 62 is arranged on the at least one steering actuation element 56, 58 and is rotatably and / or pivotably mounted together with the at least one steering actuating element 56, 58, in particular about the movement axis 64, 66 of the at least one steering actuating element 56, 58. The at least one brake actuating element 60, 62 is preferably designed as a brake lever that is pivotably mounted. A pivot axis 68, 70 preferably runs transversely, in particular at least substantially perpendicularly, to the movement axis 64, 66 of the at least one steering actuation element 56, 58. In particular, the pivot axis 68, 70 forms one, in particular with respect to the movement axis 64, 66 of the at least one steering actuation element 56, 58, further axis of movement of the at least one brake actuation element 60, 62, preferably for actuation of the brake unit 52 by a movement of the at least one brake actuation element 60, 62.

The actuation unit 54 has at least one coupling unit 72, by means of which the brake elements 74, 76 of the brake unit 52 assigned to the drive wheels 20, 22 are operatively connected to the brake actuation element 60, 62 and / or with the steering actuation element 56, 58. The brake elements 74, 76 are preferably designed as movably mounted brake shoes. The brake elements 74, 76 are preferably provided to act on a brake disk 78, 80 of the brake unit 52. However, it is also conceivable that the brake elements 74, 76 have a different configuration that appears sensible to a person skilled in the art, such as a configuration as brake pads, as brake shoes, as brake shoes or the like, which are intended for this purpose, already for a person skilled in the art to act directly on the drive wheels 20, 22 in a known manner. A brake disk 78, 80 is preferably assigned to each of the drive wheels 20, 22. One of the braking elements 74, 76 is preferably assigned to each of the drive wheels 20, 22. The brake disks 78, 80 are assigned to the drive wheels 20, 22 in a manner known to a person skilled in the art.

The wheelchair 18 has at least one frame 82, the at least one seat unit 12, the two drive wheels 20, 22 and two support and / or steering wheels (not shown here, but in FIG Figure 5 at least one bearing point of one of the support and / or steering wheels is shown). The seat unit 12 comprises the at least one seat part 14 and the at least one backrest part 16. The support and / or steering wheels are each mounted on the frame 82 in a manner already known to a person skilled in the art so that they can be rotated about a vertical axis not shown separately here. The drive wheels 20, 22 each include a hand rim 84, 86, which has a configuration and / or arrangement on each of the drive wheels 20, 22 that is already known to a person skilled in the art. The handrims 84, 86 arranged on the drive wheels 20, 22 are preferably provided for an alternative manual drive of the drive wheels 20, 22. The drive wheels 20, 22 are preferably rotatably mounted on the frame 82 by means of a common wheel axle element 88 of the wheelchair 18 in bearing bushes (not shown in detail). The seat unit 12 of the wheelchair 18 defines a seating direction of the wheelchair 18 in particular by an arrangement of the seat part 14 and the backrest part 16 relative to one another and relative to the frame 82. The seating direction preferably coincides with a forward straight-ahead driving direction.

The drive unit 46 is at least partially arranged on the frame 82. The at least one lever element 48, 50 is preferably provided to drive the drive wheels 20, 22 by means of cooperation with at least one gear unit 44 of the drive unit 46. The gear unit 44 and the at least one lever element 48, 50 preferably work together in such a way that a, in particular a reciprocating, pivoting movement of the at least one lever element 48, 50 can be converted into a rotational movement of the drive wheels 20, 22 by means of the gear unit 44. The at least two lever elements 48, 50 are preferably provided to drive the drive wheels 20, 22 by means of cooperation with the gear unit 44. The wheelchair 18 preferably comprises the at least one drive wheel 20, 22, on which at least one movement conversion unit 24 of the wheelchair device 10 is arranged for an active movement of the seat unit 12 of the wheelchair 18, the movement conversion unit 24 being separate from the gear unit 44, which is provided for that purpose at least one drive wheel 20, 22 is designed to rotate as a result of the action of an operator force on at least one of the lever elements 48, 50.

The gear unit 44 preferably comprises at least one freewheel element (not shown in detail here), which is provided to decouple the at least one lever element 48, 50 or the at least two lever elements 48, 50 from a movement of the drive wheels 20, 22, in particular for a return to realize the at least one lever element 48, 50 or the at least two lever elements 48, 50 in an initial position. One of the at least two lever elements 48, 50 is preferably arranged on different sides of the wheelchair 18, in particular the seat part 14 or the frame 82 of the wheelchair 18. The at least two lever elements 48, 50 are preferably movably coupled to one another, in particular coupled to one another movably in opposite directions, preferably by means of the gear unit 44 of the drive unit 46. When at least one of the lever elements 48, 50 is moved in one direction, at least one other of the lever elements 48, 50 is movable in an opposite direction. The wheelchair 18 is preferably designed to be operated by muscle strength. It is also conceivable that, in an alternative embodiment, the wheelchair 18 is decoupled from the drive unit 46 and / or the gear unit 44 and can be driven solely by the action of an operator's muscle strength on the handrims 84, 86.

The wheelchair device 10 for an active movement of the seat unit 12, in particular the seat part 14 and / or the backrest part 16 of the seat unit 12, comprises at least the at least partially arranged, in particular arranged, movement conversion unit 24 which can be arranged on at least one of the drive wheels 20, 22 of the wheelchair 18 provision is made to convert a movement of the at least one drive wheel 20, 22 into a movement of the seat unit 12. The movement conversion unit 24 is preferably designed as a cam gear unit. The movement conversion unit 24 has at least one movably mounted cam gear element 26 that can be arranged on the seat unit 12 and has at least one contact surface 28 that interacts with at least one movement guide track 30 of at least one further cam gear element 32 of the movement conversion unit 24 (cf. Figures 2 to 5 ). The movement conversion unit 24 has at least the movably mounted cam gear element 26, which can be arranged on the seat part 14, at least to act on the seat part 14 and which has at least the contact surface 28 which interacts with at least the movement guide track 30 of at least the further cam gear element 32 of the movement conversion unit 24. The cam gear element 26 preferably comprises at least one seat contact surface, by means of which the cam gear element 26 can be placed on the seat unit 12, in particular on the seat part 14, in particular rests. The seat contact surface is preferably provided to lie against the seat part 14 on a side of the seat part 14 facing away from a seat surface of the seat part 14. The further cam gear element 32 is preferably arranged on at least one of the drive wheels 20, 22, in particular fixed in a rotationally fixed manner on one of the drive wheels 20, 22. At least one further cam gear element 32 is preferably arranged on each of the drive wheels 20, 22. Preferably, each of the drive wheels 20, 22 is assigned at least one single cam gear element 26, which is provided to interact with the further cam gear element 32 arranged on the corresponding drive wheel 20, 22. However, it is also conceivable that only one of the drive wheels 20, 22 is assigned a single cam gear element 26 and a single further cam gear element 32.

The cam gear element 26 is preferably designed as a rocker element 38. The cam gear element 26 is preferably movably supported on the frame 82 by means of a bearing element 90 of the movement conversion unit 24. That is preferred Cam gear element 26 is pivotably mounted on frame 82. The cam gear element 26 has a pivot axis 92 which runs at least substantially parallel to a rotation axis 94 of the at least one drive wheel 20, 22. However, it is also conceivable that the cam gear element 26 in an alternative embodiment of the movement conversion unit 24 is mounted translationally on the frame 82 for an active movement of the seat unit 12, for example a translation axis of the cam gear element 26 at least substantially perpendicular to the axis of rotation 94 of the at least one drive wheel 20, 22 runs, in particular at least substantially parallel to a longitudinal axis of a frame element of frame 82, which comprises a guide track for linear guidance of cam gear element 26.

The cam gear element 26 is fixed with at least one end on the seat unit 12, in particular on the seat part 14, in particular for a movement of the seat part 14 depending on a movement of the cam gear element 26. The cam gear element 26 is preferably on a seat surface 36 of the seat part 14 The side facing away from the seat part 14 is fixed to the seat part 14. It is also conceivable that the cam gear element 26 is provided decoupled from a fixation on the seat part 14 to act on the seat part 14, for example by striking and / or resting against the seat part 14.

The motion conversion unit 24 has at least the cam gear element 26, on which at least one friction-reducing element 34, in particular a rolling element, of the motion conversion unit 24 is arranged, which is intended to interact with the motion guide track 30 of the motion conversion unit 24, in particular at least the further cam gear element 32 of the motion conversion unit 24 . The friction-reducing element 34 is preferably arranged on an end of the cam gear element 26 facing the further cam gear element 32, in particular the movement guide track 30. The friction-reducing element 34 is preferably designed as a roller bearing, in particular as a ball bearing.

The movement conversion unit 24 has at least the cam gear element 26, which has at least one movably mounted pick-up element 40. The pick-off element 40 is preferably rotatable by means of the friction-reducing element 34 mounted on cam gear element 26. The pick-off element 40 is preferably designed as a rolling element, in particular as a roller, a wheel, a roller or the like, which is provided to roll on the movement guide track 30. The friction-reducing element 34 is preferably provided, in particular indirectly, to interact with the movement guide path 30 via the pick-up element 40. It is also conceivable, however, that the motion conversion unit 26 is designed to be decoupled from the pick-up element 40 in an alternative embodiment and the friction-reducing element 34 is provided to interact directly with the motion guide track 30, in particular to form the contact surface 28 of the cam gear element 26 and to lie against the motion guide track 30 . In the alternative embodiment of the movement conversion unit 26, it is also conceivable that the friction-reducing element 34 is alternatively designed as a sliding element that has a sliding surface that can be placed against the movement guide path 30, in particular that it rests.

The movement conversion unit 24 has at least the further cam gear element 32, which is designed as a cam disk and on which at least one drive wheel 20, 22 is arranged. The further cam gear element 32 preferably has an annular configuration, an outer contour of the further cam gear element 32 having a configuration that deviates from an inner contour of the further cam gear element 32. The outer contour of the further cam gear element 32 preferably has a circular course. The inner contour of the further cam gear element 32 preferably has a non-circular course. The outer contour of the further cam gear element 32 is preferably formed by a circular line. The inner contour of the further cam gear element 32 is preferably designed to differ from a circular line. The further cam gear element 32 forms the movement guide track 30 with which the cam gear element 26, in particular the contact surface 28 of the cam gear element 26, interacts. The movement guide track 30 is preferably formed by the inner contour of the further cam gear element 32. The movement conversion unit 24 has at least the further cam gear element 32, which can be arranged, in particular arranged, on the at least one drive wheel 20, 22 and has at least the movement guide track 30, which has a non-circular, in particular oval or elliptical course (cf. Figure 5 ).

The inner contour of the further cam gear element 32 is arranged on a side of the further cam gear element 32 facing a hub of the at least one drive wheel 20, 22.

The movement conversion unit 24 has at least one spring element 42 which is provided to apply a spring force to at least the cam gear element 26 of the movement conversion unit 24. The spring element 42 is preferably provided to act on the cam gear element 26 with a spring force in the direction of the further cam gear element 32. The spring element 42 is preferably designed as a helical compression spring. However, it is also conceivable that the spring element 42 has a different configuration that appears sensible to a person skilled in the art, such as a configuration as a leg spring, as an evolute spring, as a tension spring or the like. The spring element 42 is preferably supported with at least one end on the frame 82 from. With a further end, the spring element 42 is preferably supported on the cam gear element 26. Reliable abutment of the cam gear element 26 on the movement guide track 30 for an active movement of the seat unit 12 can advantageously be implemented.

The seat part 14 and / or the backrest part 16 are preferably mounted on the frame 82 by means of a seat suspension device not shown here in such a way that the seat part 14 and / or the backrest part 16 can be laterally deflected around a seat part center position and / or a backrest part center position. The seat part 14 is preferably mounted so as to be movable about a horizontal axis 96. The seat part 14 is preferably mounted pivotably about the horizontal axis 96. The horizontal axis 96 preferably runs at least substantially parallel to a seat surface 36. Alternatively or in addition, the seat part 14 could advantageously be movably mounted about a vertical axis 98 which runs at least substantially perpendicular to the horizontal axis 96 and / or to the seat surface 36, so that the seat part 14 would oscillate, for example, in a horizontal plane. The backrest part 16 is preferably connectable, in particular connected, to the seat part 14 and / or to the movement conversion unit 24 via a transmission unit (not shown). The backrest part 16 is preferably connected to the seat part 14 and / or to the movement conversion unit 24 by means of the transmission unit in such a way that the backrest part 16 is laterally deflectable in an oscillating manner when the seat part 14 is deflected about the vertical axis 98 from its central position of the backrest part.

For an active movement of the seat unit 12, in particular the seat part 14 and / or the backrest part 16 of the seat unit 12 by means of the movement conversion unit 24, a movement of the at least one drive wheel 20, 22 is preferably converted into a movement of the seat unit 12. As a result of a non-rotatable arrangement of the further cam gear element 32 on the at least one drive wheel 20, 22, the further cam gear element 32 is driven to rotate together with the at least one drive wheel 20, 22, in particular by the action of a muscle force of an operator via the handrims 84, 86 or via the Lever elements 48, 50. The cam gear element 26 interacts with the movement guide track 30 of the further cam gear element 32 in such a way that the cam gear element 26 is pivotable about the pivot axis 92 of the cam gear element 26 as a result of a rotation of the further cam gear element 32, in particular is pivoted, in particular as a result of a non-circular, in particular oval or elliptical design of the movement guide track 30. The oscillating pivoting movement of the cam gear element 26 caused by the interaction of the cam gear element 26 and the movement guide track 30 is transmitted to the seat units it 12, in particular the seat part 14, can be transferred. The seat unit 12 can be actively moved in a particularly structurally simple manner by means of the movement conversion unit 24 as a function of a rotation of the at least drive wheel 20, 22.

The wheelchair device 10 comprises at least one activation unit 100, which is provided to activate or deactivate an action of the movement conversion unit 24 on the seat unit 12, in particular the seat part 14 and / or the backrest part 16, in particular as a result of manual actuation by an operator ( see. Figure 2 ). The activation unit 100 is preferably designed as a mechanical activation unit that can be manually operated by an operator. Preferably, at least one activation element (not shown in more detail here), such as an activation lever or the like, can be manually actuated, in particular moved, by an operator. The activation element is preferably provided, as a result of an actuation by an operator, a transmission of movement of the cam gear element 26 to the seat unit 12, in particular the seat part 14 and / or the backrest part 16, to release or lock, in particular to activate or deactivate an action of the movement conversion unit 24 on the seat unit 12, in particular the seat part 14 and / or the backrest part 16. The activation element can be provided to enable or block a possibility of movement of the cam gear element 26. The activation element can alternatively or additionally be provided to enable or block a possibility of movement of the seat unit 12, in particular the seat part 14 and / or the backrest part 16. The activation element can be provided to actively move the cam gear element 26, in particular along and / or around an activation axis that is different from a movement axis, in particular the pivot axis 92, of the cam gear element 26 along and / or around which the cam gear element 26 to one Action on the seat unit 12, in particular on the seat part 14 and / or the backrest part 16, is movably mounted. The activation element can alternatively or additionally be provided to actively move the further cam gear element 32, in particular to move it away from the cam gear element 26, for example by moving the further cam gear element 32 along an at least substantially parallel to the axis of rotation 94 or the like However, it is also conceivable that the activation unit 100 is at least partially electronic and has at least one electronic component, such as an electronic actuator or the like, which is provided for the action of the movement conversion unit 24 on the seat unit 12, in particular the seat part 14 and / or to activate or deactivate the backrest part 16. It is also conceivable that the activation unit 100 has a communication unit which is provided for, in particular wirelessly, data with an external unit (not shown in detail here), such as a smartphone, a tablet, a PC or the like. to be exchanged, in particular via an application installed on the external unit, by means of which the electronic activation unit can be controlled. Further configurations of the activation unit 100 that appear sensible to a person skilled in the art are also conceivable. The activation unit 100 is preferably provided to act synchronously on the cam gear elements 26 assigned to the individual drive wheels 20, 22 and / or the further cam gear elements 32. However, it is also conceivable that each of the individual drive wheels 20, 22 associated cam gear elements 26 and / or the further cam gear elements 32 are assigned their own activation element which can be actuated independently of the respective other activation elements.

Reference number

10

Wheelchair device

12th

Seat unit

14th

Seat part

16

Backrest part

18th

wheelchair

20th

drive wheel

22nd

drive wheel

24

Motion conversion unit

26th

Cam gear element

28

Contact area

30th

Motion guideway

32

Cam gear element

34

Friction reducing element

36

Seat

38

Rocker element

40

Pick-off element

42

Spring element

44

Gear unit

46

Drive unit

48

Lever element

50

Lever element

52

Braking unit

54

Actuation unit

56

Steering actuator

58

Steering actuator

60

Brake actuator

62

Brake actuator

64

Axis of motion

66

Axis of motion

68

Swivel axis

70

Swivel axis

72

Coupling unit

74

Braking element

76

Braking element

78

Brake disc

80

Brake disc

82

frame

84

Push rims

86

Push rims

88

Wheel axle element

90

Bearing element

92

Swivel axis

94

Axis of rotation

96

Horizontal axis

98

Vertical axis

100

Activation unit

Claims (9)

1. Wheelchair device for actively moving a seat unit (12), in particular a seat part (14) and a backrest part (16) of the seat unit (12), of a wheelchair (18), comprising at least one movement-converting unit (24) that can be arranged at least in part on at least one drive wheel (20, 22) of the wheelchair (18) and is provided to convert a movement of the at least one drive wheel (20, 22) into a movement of the seat unit (12), wherein the movement-converting unit (24) is designed as a cam-mechanism unit, wherein the movement-converting unit (24) comprises, at least for having an effect on the seat part (14), at least one movably mounted cam-mechanism element (26) that can be arranged on the seat part (14), which element has at least one contact face (28) which interacts with at least one movement guideway (30) of at least one additional cam-mechanism element (32) of the movement-converting unit (24), wherein the movement-converting unit (24) comprises at least the additional cam-mechanism element (32), which is designed as a cam disc and can be arranged on the at least one drive wheel (20, 22), characterised in that the movement guideway (30) of the additional cam-mechanism element (32) is arranged on an inner face of the additional cam-mechanism element (32) that faces a hub of the at least one drive wheel (20, 22).
2. Wheelchair device according to claim 1, characterised in that the movement-converting unit (24) comprises at least the cam-mechanism element (26), on which at least one friction-reducing element (34), in particular a rolling element, of the movement-converting unit (24) is arranged, which friction-reducing element is provided for interacting with a movement guideway (30) of the movement-converting unit (24), in particular at least of the additional cam-mechanism element (32) of the movement-converting unit (24).
3. Wheelchair device according to any of the preceding claims, characterised in that the movement-converting unit (24) comprises at least one, in particular the additional, cam-mechanism element (32), which can be arranged on the at least one drive wheel (20, 22) and comprises at least the movement guideway (30), which has a non-circular, in particular oval or elliptical, shape.
4. Wheelchair device according to any of the preceding claims, characterised in that the movement-converting unit (24) comprises at least one rocker element (38), which forms at least the cam-mechanism element (26) of the movement-converting unit (24).
5. Wheelchair device according to any of the preceding claims, characterised in that the movement-converting unit (24) comprises at least the cam-mechanism element (26), which comprises at least one movably mounted tapping element (40).
6. Wheelchair device according to any of the preceding claims, characterised in that the movement-converting unit (24) comprises at least one spring element (42), which is provided to apply a spring force at least to the cam-mechanism element (26) of the movement-converting unit (24).
7. Wheelchair device according to any of the preceding claims, characterised by at least one activation unit (100), which is provided to activate or deactivate an effect of the movement-converting unit (24) on the seat unit (12), in particular the seat part (14) and/or the backrest part (16), in particular due to a manual actuation by a user.
8. Wheelchair, in particular a manual wheelchair, comprising at least one wheelchair device according to any of the preceding claims.
9. Wheelchair according to claim 8, characterised by at least one drive wheel (20, 22), on which at least the movement-converting unit (24) of the wheelchair device is arranged, wherein the movement-converting unit (24) is designed to form a rotating drive of the at least one drive wheel (20, 22) separately from a mechanism unit (44).

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