EP1437114B1 - Pivotable leg support with automatic length adjustment for a wheelchair - Google Patents

Pivotable leg support with automatic length adjustment for a wheelchair Download PDF

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Publication number
EP1437114B1
EP1437114B1 EP03028738A EP03028738A EP1437114B1 EP 1437114 B1 EP1437114 B1 EP 1437114B1 EP 03028738 A EP03028738 A EP 03028738A EP 03028738 A EP03028738 A EP 03028738A EP 1437114 B1 EP1437114 B1 EP 1437114B1
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EP
European Patent Office
Prior art keywords
wheelchair
leg support
legrest
frame part
lever
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Expired - Lifetime
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EP03028738A
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German (de)
French (fr)
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EP1437114A1 (en
Inventor
Veit Müller
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Meyra Wilhelm Meyer GmbH and Co KG
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Meyra Wilhelm Meyer GmbH and Co KG
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Publication of EP1437114A1 publication Critical patent/EP1437114A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • A61G5/128—Rests specially adapted therefor, e.g. for the head or the feet for feet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G2203/00—General characteristics of devices
    • A61G2203/70—General characteristics of devices with special adaptations, e.g. for safety or comfort
    • A61G2203/74—General characteristics of devices with special adaptations, e.g. for safety or comfort for anti-shear when adjusting furniture

Definitions

  • the invention relates to a wheelchair leg rest for a wheelchair, which comprises a frame part, on which the leg rest is pivotally storable.
  • the angular adjustability of the legrest results from therapeutic, anatomical and / or personal requirements of the wheelchair user.
  • leg support design is suitable for the particular patient or wheelchair user should be decided by healthcare professionals. It is particularly crucial where the axis of rotation of the pivoting legrest is located to allow the user not only a comfortable storage of his leg, but also to allow entry into the wheelchair or leaving the wheelchair. Another important aspect is the length of the leg support. This must be adaptable to the anatomical conditions of the user.
  • the lateral freedom of movement of the wheelchair user, in relation to its seating position, is of great importance in order not to hinder easy lateral exiting or climbing the wheelchair, for example when changing over to another seat.
  • the upper edge of the leg support is located below the lower leg of the user.
  • the front edge of the legrest must be behind the knee of the leg of the wheelchair user to be supported. Otherwise, this would be disturbed when leaving or climbing the wheelchair with his leg or lower leg through the footrest. Apart from inconvenience this also results in a non-negligible risk of accidents.
  • legrest does not coincide with the anatomical knee pivot axis.
  • the result of the movement geometry is that the legrest shortens when lifting from the sitting position to the horizontal position relative to the lower leg of the user, so that its leg is narrowed in the extended state in its length.
  • Another disadvantage is that due to unfavorable leverage ratios of the known adjustment mechanisms often sufficient forces can not be realized in order to adequately ensure the angular adjustment of the loaded legrest.
  • US 5 711 580 A shows a wheelchair with a pivoting legrest.
  • the legrest is designed so that either by manually pivoting the foot plate itself or with the aid of an additional operating lever, the legrest is movable up and down. Since the leg support each comprises two struts, it is necessary for the hinge mechanism that one of these struts, which acts neither as a tension rod nor as a push rod, telescopically designed.
  • the telescopic strut merely serves to effect the angular alignment of the footplate.
  • the invention has for its object to provide a legrest of the type mentioned, which has a simple design and simple, cost manufacturability while avoiding the disadvantages of the prior art, an automatic length adjustment.
  • the legrest according to the invention is characterized by a number of significant advantages.
  • the underlying principle of the leg support realized according to the invention provides for the connection of a 4-joint mechanism with a 3-joint mechanism.
  • this construction according to the invention causes a change in length of the support arm, which is pivotally mounted on the frame part and whose length is variable servo motor, automatically raising or lowering the legrest. This means that the legrest automatically becomes longer when pivoting from the substantially vertical seating position into a substantially horizontal position, so that a correspondingly automatic length compensation results.
  • the legrest according to the invention comprises a telescopic support arm, which comprises a main part and a push rod, it is possible to realize the adjustability in the smallest space. This results in a very compact construction of the legrest.
  • the double-sided rocker arm according to the invention in conjunction with a push rod which extends from a first lever part of the rocker arm (hinged on both sides) to the frame part and by the use of a pull rod, which (hingedly connected) from the second lever part of the rocker arm to extends the free end portion of the push rod, the above-described combination of a 3-joint mechanism is realized with a 4-joint mechanism with very simple means.
  • the leg rest according to the invention Due to the possibility to store the push rod and / or the tension rod at different articulation points of the double-sided rocker arm, according to the invention also provides the opportunity to adjust the legrest in a very simple manner with regard to their automatic length compensation. A further adjustment can be made by the choice of the lengths of the tie rod and / or the push rod, so that the leg rest according to the invention can be used for both adult wheelchairs and children's wheelchairs without having to change the basic construction.
  • the carrier arm comprises a linear drive.
  • This linear drive includes commercially available components, so that the overall manufacturing cost of the legrest can be very low.
  • a 24V DC motor is used which drives a drive spindle which meshes with a nut fixedly connected to the push rod. By the mother, the rotational movement of the motor is converted into the required translational movement of the push rod.
  • Such a structure is simple and inexpensive to produce and is characterized by a high degree of robustness.
  • All components of the drive unit according to the invention can be stored and / or guided in a common housing. As a result, damage to the drive unit can be avoided by contamination. At the same time it is prevented that the user of the wheelchair undesirably comes into contact with the drive elements and may damage them if necessary.
  • the frame part can be mounted pivotably on a wheelchair frame about a substantially vertical axis.
  • the legrest according to the invention can be attached to existing wheelchair constructions without them having to be fundamentally changed. It is particularly advantageous if the frame part is detachably mounted on the wheelchair. As a result, the legrest according to the invention, for example, to transport the wheelchair, or to adapt to the particular circumstances of the user quickly and easily be mounted.
  • two leg supports can be provided on a wheelchair. However, it may also be provided only one legrest for supporting the respective required leg of the wheelchair user.
  • the legrest according to the invention makes it possible to mount conventional foot plates or foot plate constructions on the push rod, so that there is also a great compatibility with existing wheelchair concepts.
  • legrest according to the invention is designed very compact. In the sitting position, all movable components are arranged in close association with each other, so that the freedom of movement of the user is hardly limited.
  • the inventive design results in a structure in which the legrest has its greatest length in the horizontal position, as required by the anatomical conditions of the wheelchair user.
  • the servo-motor drive performs four basic functions: on the one hand it serves as a drive, on the other hand it forms the load-bearing system of the legrest according to the invention. Furthermore, it leads to the desired automatic length compensation. In addition, it allows the recording or storage of the foot plate, which is itself infinitely adjustable.
  • the design chosen according to the invention results in a very large length compensation, which may be 85 mm or more, for example, in conventional gear ratios of the lever mechanism described.
  • legrest extends over wide areas, in particular the legrest can be used on a wide variety of wheelchair constructions. It is removable and swiveling and thus adapts to the respective conditions of use.
  • the figures initially show a section of a wheelchair frame 8 with a seat cushion 10 shown schematically.
  • a frame part 1 is pivotally mounted about a vertical axis 9.
  • the frame part 1 is thus pivotable laterally, as can be seen from the representation of FIG. 2. Furthermore, the frame part 1 can be lifted upwards and thus separated from the wheelchair frame 8.
  • a support arm 2 is mounted pivotably about a substantially horizontal pivot axis 12, comprising a main part 3 and a push rod 4 mounted telescopically thereon.
  • the main part 3 comprises a linear drive, not shown in detail, for example with a spindle and a nut and a DC motor. By actuating the linear drive, the push rod 4 is extended or retracted relative to the main part 3.
  • a double-acting rocker arm 5 is mounted by means of a pivot axis 13, which comprises a first lever part 5a and a second lever part 5b.
  • a pressure rod 6 is pivotally mounted via a pivot axis 14, the other end of which is pivotally mounted on the frame part 1 via a pivot axis 15.
  • the second lever part 5b supports, pivotable about a pivot axis 16, a tension rod 7, which is coupled at its other end via a pivot axis 17 with the push rod 4.
  • the legrest according to the invention thus forms a virtual fulcrum, which is brought to coincide with the pivot point or the axis of rotation of the knee of the user of the wheelchair by placing the legrest on the wheelchair. As a result, a relative movement between the leg support and the lower leg of the leg to be supported is prevented.
  • the legrest according to the invention extends over the adjustment angle, thus a superposition of a rotational movement and a translational movement of the base plate takes place.
  • the inventive design of the drive is self-locking, so that the lever mechanism formed by the leg support forms a statically determined system in the unactuated state. An unwanted lowering of the legrest is thus prevented.
  • the push rod 4 has a bearing head 19 at its free end. This can be suitably adapted to the respective structural requirements.
  • a calf pad 18 is provided laterally to support the calf of the wheelchair user accordingly. It is understood that, according to the invention, protective devices and / or padding can be provided in order to cover in particular variable cross sections of the pressure rod 6 and the tension rod 7 and the rocker arm 5 and to eliminate the risk of pinching the leg of the wheelchair user.
  • the electrical connection of the legrest according to the invention can take place via contact pins, for example in the region of the mounting of the frame part 1 on the wheelchair frame 8 can be provided. However, it is also possible to provide additional electrical cable or plug.
  • legrest according to the invention thus has a low and short construction, which does not hinder the freedom of movement of the wheelchair user. Furthermore, there is an automatic length compensation, which fully meets the anatomical requirements, for example, at an adjustment angle of 115 ° to 180 °.
  • the handling of the legrest according to the invention is greatly facilitated, so that both the wheelchair user and escorts can handle this easily.

Abstract

A leg support has a supporting arm (SA) (2) on bearings so as to swivel on a frame part (FP) (1). A slide rod (4) can operate like a telescope in relation to a main part (3). On a free end area, the SA has a double-sided rocker lever (5) to swivel on bearings with its first lever part (5a) linked with an articulated joint by means of a compression bar (6) on the FP.

Description

Die Erfindung bezieht sich auf eine Rollstuhlbeinstütze für einen Rollstuhl, welcher ein Rahmenteil umfasst, an welchem die Beinstütze schwenkbar lagerbar ist.The invention relates to a wheelchair leg rest for a wheelchair, which comprises a frame part, on which the leg rest is pivotally storable.

Aus dem Stand der Technik ist es bekannt, bei Rollstühlen, insbesondere bei Elektrorollstühlen, winkelverstellbare Beinstützen vorzusehen, die zwischen einer Sitzposition und einer im Wesentlichen horizontalen Position verstellbar sind, um auf diese Weise den Unterschenkel des Rollstuhlbenutzers zu lagern.It is known from the prior art to provide angle-adjustable legrests in wheelchairs, in particular electric wheelchairs, which are adjustable between a sitting position and a substantially horizontal position in order to support the lower leg of the wheelchair user in this way.

Die Winkelverstellbarkeit der Beinstütze ergibt sich aus therapeutischen, anatomischen und/oder persönlichen Erfordernissen des Rollstuhlbenutzers.The angular adjustability of the legrest results from therapeutic, anatomical and / or personal requirements of the wheelchair user.

Ob eine spezifische Beinstützen-Konstruktion für den jeweiligen Patienten oder Rollstuhlbenutzer geeignet ist, ist durch medizinisches Fachpersonal zu entscheiden. Dabei ist insbesondere ausschlaggebend, wo sich die Drehachse der verschwenkbaren Beinstütze befindet, um dem Benutzer nicht nur eine bequeme Lagerung seines Beines zu ermöglichen, sondern auch das Einsteigen in den Rollstuhl bzw. das Verlassen des Rollstuhls zu ermöglichen. Ein weiterer, wesentlicher Aspekt liegt in der Länge der Beinstütze. Diese muss an die anatomischen Gegebenheiten des Benutzers anpassbar sein.Whether a specific leg support design is suitable for the particular patient or wheelchair user should be decided by healthcare professionals. It is particularly crucial where the axis of rotation of the pivoting legrest is located to allow the user not only a comfortable storage of his leg, but also to allow entry into the wheelchair or leaving the wheelchair. Another important aspect is the length of the leg support. This must be adaptable to the anatomical conditions of the user.

Weiterhin ist zu beachten, dass die seitliche Bewegungsfreiheit des Rollstuhlbenutzers, bezogen auf seine Sitzposition, von großer Bedeutung ist, um ein problemloses seitliches Verlassen oder Besteigen des Rollstuhls, beispielsweise beim Umsteigen auf einen anderen Sitz, nicht zu behindern. Hierzu ist es wünschenswert, wenn die Oberkante der Beinstütze sich unterhalb des Unterschenkels des Benutzers befindet. Weiterhin muss sich die Vorderkante der Beinstütze hinter dem Knie des abzustützenden Beins des Rollstuhlbenutzers befinden. Anderenfalls würde dieser beim Verlassen oder Besteigen des Rollstuhls mit seinem Bein oder Unterschenkel durch die Fußstütze gestört werden. Abgesehen von Unannehmlichkeiten ergibt sich hierbei auch eine nicht zu vernachlässigende Unfallgefahr.Furthermore, it should be noted that the lateral freedom of movement of the wheelchair user, in relation to its seating position, is of great importance in order not to hinder easy lateral exiting or climbing the wheelchair, for example when changing over to another seat. For this purpose, it is desirable if the upper edge of the leg support is located below the lower leg of the user. Farther the front edge of the legrest must be behind the knee of the leg of the wheelchair user to be supported. Otherwise, this would be disturbed when leaving or climbing the wheelchair with his leg or lower leg through the footrest. Apart from inconvenience this also results in a non-negligible risk of accidents.

Daraus folgt, dass sich die Schwenkachse der Beinstütze nicht mit der anatomischen Kniegelenk-Schwenkachse deckt. Aus der Bewegungsgeometrie ergibt sich damit, dass sich die Beinstütze beim Anheben aus der Sitzposition in die horizontale Position relativ zum Unterschenkel des Benutzers verkürzt, so dass dessen Bein im gestreckten Zustand in seiner Länge eingeengt wird.It follows that the pivot axis of the legrest does not coincide with the anatomical knee pivot axis. The result of the movement geometry is that the legrest shortens when lifting from the sitting position to the horizontal position relative to the lower leg of the user, so that its leg is narrowed in the extended state in its length.

Die aus dem Stand der Technik bekannten Konstruktionen für elektrisch winkelverstellbare Beinstützen zeichnen sich insgesamt durch eine Vielzahl von Nachteilen aus.The known from the prior art constructions for electrically adjustable angle legrests are characterized by a number of disadvantages.

Um die Problematik der Länge der Beinstütze in der Sitzposition bzw. der horizontalen Position zu kompensieren, zeigt der Stand der Technik Konstruktionen, die einen sehr hohen und weit vorstehenden Aufbau aufweisen. Hierdurch wird das seitliche Ein- und Aussteigen sowie das Umsteigen des Rollstuhlfahrers auf einen anderen Sitz stark behindert.To compensate for the problem of the length of the legrest in the sitting position or the horizontal position, the prior art shows constructions which have a very high and far protruding structure. As a result, the lateral entry and exit and the transfer of the wheelchair user to another seat is severely hampered.

Ein weiterer Nachteil besteht darin, dass aufgrund ungünstiger Hebelverhältnisse der bekannten Verstellmechanismen vielfach keine ausreichenden Kräfte realisiert werden können, um die Winkelverstellung der belasteten Beinstütze ausreichend sicherzustellen.Another disadvantage is that due to unfavorable leverage ratios of the known adjustment mechanisms often sufficient forces can not be realized in order to adequately ensure the angular adjustment of the loaded legrest.

Andere, vorbekannte Konstruktionen mit einem automatischen und körpergerechten Längenausgleich weisen den Nachteil auf, dass sie sehr schwer sind und sehr viel Bauraum in Anspruch nehmen, wodurch sich die Handhabung der Beinstützen sehr erschwert. Hinzu kommt ein hoher fertigungstechnischer Aufwand, der mit hohen Herstellungskosten verbunden ist.Other, prior art designs with an automatic and ergonomic length compensation have the disadvantage that they are very heavy and take up a lot of space, which makes handling the legrests very difficult. In addition, there is a high production outlay, which is associated with high production costs.

Wieder andere, vorbekannte Konstruktionen umfassen einen Verstellmechanismus, welcher fest mit dem Rollstuhl-Rahmen verbunden ist, so dass ein individueller Einsatz und eine individuelle Anpassung an die Erfordernisse des Rollstuhlbenutzers nicht möglich sind.Still other, previously known constructions include an adjustment mechanism which is fixedly connected to the wheelchair frame, so that an individual use and an individual adaptation to the needs of the wheelchair user are not possible.

Die US 5 711 580 A zeigt einen Rollstuhl mit einer verschwenkbaren Beinstütze. Die Beinstütze ist so ausgebildet, dass entweder durch manuelles Verschwenken der Fußplatte selbst oder Zuhilfenahme eines zusätzlichen Bedienungshebels die Beinstütze auf und ab bewegbar ist. Da die Beinstütze jeweils zwei Streben umfasst, ist es für den Gelenkmechanismus erforderlich, dass eine dieser Streben, welche weder als Zugstab noch als Druckstab wirkt, teleskopartig ausgestaltet ist. Die Teleskopstrebe dient lediglich dazu, die winkelmäßige Ausrichtung der Fußplatte zu bewirken.US 5 711 580 A shows a wheelchair with a pivoting legrest. The legrest is designed so that either by manually pivoting the foot plate itself or with the aid of an additional operating lever, the legrest is movable up and down. Since the leg support each comprises two struts, it is necessary for the hinge mechanism that one of these struts, which acts neither as a tension rod nor as a push rod, telescopically designed. The telescopic strut merely serves to effect the angular alignment of the footplate.

Vergleicht man die Konstruktion mit der vorliegenden Erfindung, so ergeben sich keinerlei Übereinstimmungen, insbesondere, da keine servomotorisch verlängerbare Strebe vorgesehen ist.Comparing the construction with the present invention, there are no matches, in particular, since no servo-motor extendable strut is provided.

Aus der GB 2 330 299 A ist eine andere Beinstützenkonstruktion bekannt.From GB 2 330 299 A another legrest construction is known.

Insgesamt ist aus dieser Druckschrift somit ein gänzlich anderes technisches Grundprinzip vorbekannt.Overall, from this document thus a completely different basic technical principle is already known.

Der Erfindung liegt die Aufgabe zugrunde, eine Beinstütze der eingangs genannten Art zu schaffen, welche bei einfachem Aufbau und einfacher, kostengünstiger Herstellbarkeit unter Vermeidung der Nachteile des Standes der Technik eine automatische Längenanpassung aufweist.The invention has for its object to provide a legrest of the type mentioned, which has a simple design and simple, cost manufacturability while avoiding the disadvantages of the prior art, an automatic length adjustment.

Erfindungsgemäß wird die Aufgabe durch die Merkmalskombination des Hauptanspruchs gelöst. Die Unteransprüche zeigen weitere vorteilhafte Ausgestaltungen der Erfindung.According to the invention the object is achieved by the feature combination of the main claim. The subclaims show further advantageous embodiments of the invention.

Die erfindungsgemäße Beinstütze zeichnet sich durch eine Reihe erheblicher Vorteile aus.The legrest according to the invention is characterized by a number of significant advantages.

Das erfindungsgemäß verwirklichte, zugrunde liegende Prinzip der Beinstütze sieht die Verknüpfung eines 4-Gelenk-Mechanismus mit einem 3-Gelenk-Mechanismus vor. Durch diesen erfindungsgemäßen Aufbau bewirkt eine Längenänderung des Trägerarms, der schwenkbar an dem Rahmenteil lagerbar ist und dessen Länge servomotorisch veränderbar ist, automatisch ein Anheben oder Absenken der Beinstütze. Das bedeutet, dass die Beinstütze bei einer Verschwenkung von der im Wesentlichen vertikalen Sitzposition in eine im Wesentlichen horizontale Position automatisch länger wird, so dass sich ein entsprechend automatischer Längenausgleich ergibt.The underlying principle of the leg support realized according to the invention provides for the connection of a 4-joint mechanism with a 3-joint mechanism. By this construction according to the invention causes a change in length of the support arm, which is pivotally mounted on the frame part and whose length is variable servo motor, automatically raising or lowering the legrest. This means that the legrest automatically becomes longer when pivoting from the substantially vertical seating position into a substantially horizontal position, so that a correspondingly automatic length compensation results.

Da die erfindungsgemäße Beinstütze einen teleskopierbaren Trägerarm umfasst, der ein Hauptteil sowie eine Schubstange umfasst, ist es möglich, auf kleinstem Bauraum die Verstellbarkeit zu realisieren. Hierdurch ergibt sich ein sehr kompakter Aufbau der Beinstütze. Durch die Verwendung des erfindungsgemäßen doppelseitigen Kipphebels in Verbindung mit einem Druckstab, der sich von einem ersten Hebelteil des Kipphebels (beidseitig gelenkig verbunden) zu dem Rahmenteil erstreckt und durch die Verwendung eines Zugstabs, der sich (gelenkig verbunden) von dem zweiten Hebelteil des Kipphebels zu dem freien Endbereich der Schubstange erstreckt, wird mit sehr einfachen Mitteln die oben beschriebenen Kombination eines 3-Gelenk-Mechanismus mit einem 4-Gelenk-Mechanismus realisiert. Durch die Möglichkeit, den Druckstab und/oder den Zugstab an unterschiedlichen Anlenkpunkten des doppelseitigen Kipphebels zu lagern, ergibt sich erfindungsgemäß auch die Möglichkeit, die Beinstütze in sehr einfacher Weise hinsichtlich ihres automatischen Längenausgleichs anzupassen. Eine weitere Anpassung kann durch die Wahl der Längen des Zugstabs und/oder des Druckstabs erfolgen, so dass die erfindungsgemäße Beinstütze sowohl für Erwachsenen-Rollstühle als auch für Kinder-Rollstühle verwendbar ist, ohne die Grundkonstruktion ändern zu müssen.Since the legrest according to the invention comprises a telescopic support arm, which comprises a main part and a push rod, it is possible to realize the adjustability in the smallest space. This results in a very compact construction of the legrest. By using the double-sided rocker arm according to the invention in conjunction with a push rod which extends from a first lever part of the rocker arm (hinged on both sides) to the frame part and by the use of a pull rod, which (hingedly connected) from the second lever part of the rocker arm to extends the free end portion of the push rod, the above-described combination of a 3-joint mechanism is realized with a 4-joint mechanism with very simple means. Due to the possibility to store the push rod and / or the tension rod at different articulation points of the double-sided rocker arm, according to the invention also provides the opportunity to adjust the legrest in a very simple manner with regard to their automatic length compensation. A further adjustment can be made by the choice of the lengths of the tie rod and / or the push rod, so that the leg rest according to the invention can be used for both adult wheelchairs and children's wheelchairs without having to change the basic construction.

Erfindungsgemäß besonders vorteilhaft ist es, wenn der Trägerarm einen Linearantrieb umfasst. Dieser Linearantrieb umfasst handelsüblich erhältliche Bauelemente, so dass die Gesamt-Herstellungskosten der Beinstütze sehr niedrig sein können. So wird beispielsweise ein 24 V-Gleichstrom-Motor verwendet, welcher eine Antriebsspindel antreibt, die mit einer Mutter kämmt, welche fest mit der Schubstange verbunden ist. Durch die Mutter wird die rotatorische Bewegung des Motors in die erforderliche translatorische Bewegung der Schubstange umgewandelt. Ein derartiger Aufbau ist einfach und kostengünstig herstellbar und zeichnet sich durch eine hohe Robustheit aus.According to the invention, it is particularly advantageous if the carrier arm comprises a linear drive. This linear drive includes commercially available components, so that the overall manufacturing cost of the legrest can be very low. For example, a 24V DC motor is used which drives a drive spindle which meshes with a nut fixedly connected to the push rod. By the mother, the rotational movement of the motor is converted into the required translational movement of the push rod. Such a structure is simple and inexpensive to produce and is characterized by a high degree of robustness.

Sämtliche Bauteile der erfindungsgemäßen Antriebseinheit können in einem gemeinsamen Gehäuse gelagert und/oder geführt werden. Hierdurch werden Beschädigungen der Antriebseinheit durch Verschmutzung vermieden. Gleichzeitig wird verhindert, dass der Benutzer des Rollstuhls in unerwünschter Weise mit den Antriebselementen in Kontakt kommt und diese gegebenenfalls beschädigen kann.All components of the drive unit according to the invention can be stored and / or guided in a common housing. As a result, damage to the drive unit can be avoided by contamination. At the same time it is prevented that the user of the wheelchair undesirably comes into contact with the drive elements and may damage them if necessary.

Besonders günstig ist es, wenn der Rahmenteil um eine im Wesentlichen vertikale Achse schwenkbar an einem Rollstuhlrahmen lagerbar ist. Die erfindungsgemäße Beinstütze kann an bestehende Rollstuhl-Konstruktionen angebaut werden, ohne dass diese grundsätzlich geändert werden müssen. Besonders vorteilhaft ist es dabei, wenn der Rahmenteil abnehmbar an dem Rollstuhl lagerbar ist. Hierdurch kann die erfindungsgemäße Beinstütze, beispielsweise zum Transport des Rollstuhls, oder zur Anpassung an die jeweiligen Gegebenheiten des Benutzers schnell und einfach montiert werden.It is particularly favorable when the frame part can be mounted pivotably on a wheelchair frame about a substantially vertical axis. The legrest according to the invention can be attached to existing wheelchair constructions without them having to be fundamentally changed. It is particularly advantageous if the frame part is detachably mounted on the wheelchair. As a result, the legrest according to the invention, for example, to transport the wheelchair, or to adapt to the particular circumstances of the user quickly and easily be mounted.

Es versteht sich, dass erfindungsgemäß zwei Beinstützen an einem Rollstuhl vorgesehen sein können. Es kann jedoch auch nur eine Beinstütze zur Abstützung des jeweils benötigten Beines des Rollstuhlfahrers vorgesehen sein.It is understood that according to the invention two leg supports can be provided on a wheelchair. However, it may also be provided only one legrest for supporting the respective required leg of the wheelchair user.

Die erfindungsgemäße Beinstütze ermöglicht es, übliche Fußplatten oder Fußplatten-Konstruktionen an der Schubstange zu montieren, so dass auch hier eine große Kompatibilität zu vorhandenen Rollstuhlkonzepten vorliegt.The legrest according to the invention makes it possible to mount conventional foot plates or foot plate constructions on the push rod, so that there is also a great compatibility with existing wheelchair concepts.

Aus oben stehenden Ausführungen ergibt sich, dass die erfindungsgemäße Beinstütze sehr kompakt ausgestaltet ist. In der Sitzposition sind sämtliche beweglichen Bauteile in engster Zuordnung zueinander angeordnet, so dass die Bewegungsfreiheit des Benutzers kaum eingeschränkt wird.From the above statements it follows that the legrest according to the invention is designed very compact. In the sitting position, all movable components are arranged in close association with each other, so that the freedom of movement of the user is hardly limited.

Durch die erfindungsgemäße Ausgestaltung ergibt sich ein Aufbau, bei welchem die Beinstütze ihre größte Länge in der horizontalen Position aufweist, so wie dies durch die anatomischen Gegebenheiten des Rollstuhlbenutzers gefordert wird.The inventive design results in a structure in which the legrest has its greatest length in the horizontal position, as required by the anatomical conditions of the wheelchair user.

Erfindungsgemäß übernimmt der servomotorische Antrieb vier Grundfunktionen: Zum einen dient er als Antrieb, zum anderen bildet er das tragende System der erfindungsgemäßen Beinstütze. Weiterhin führt er zu dem gewünschten automatischen Längenausgleich. Zudem ermöglicht er die Aufnahme oder Lagerung der Fußplatte, welche selbst stufenlos einstellbar ist.According to the invention, the servo-motor drive performs four basic functions: on the one hand it serves as a drive, on the other hand it forms the load-bearing system of the legrest according to the invention. Furthermore, it leads to the desired automatic length compensation. In addition, it allows the recording or storage of the foot plate, which is itself infinitely adjustable.

Durch die erfindungsgemäß gewählte Konstruktion ergibt sich ein sehr großer Längenausgleich, welcher bei üblichen Übersetzungsverhältnissen der beschriebenen Hebelgetriebe beispielsweise 85 mm oder mehr betragen kann.The design chosen according to the invention results in a very large length compensation, which may be 85 mm or more, for example, in conventional gear ratios of the lever mechanism described.

Erfindungsgemäß ergibt sich eine große Hubkraft, wobei bei einem größer werdenden Verstellwinkel eine günstigere Krafteinleitung erfolgt, so dass gewährleistet ist, dass die Beinstütze auch bei Erreichen der horizontalen Position über ausreichende Kraftreserven verfügt.According to the invention results in a large lifting force, wherein at a larger adjustment angle a more favorable introduction of force, so that it is ensured that the legrest has sufficient power reserves even when reaching the horizontal position.

Der Einsatzbereich der erfindungsgemäßen Beinstütze erstreckt sich über weite Bereiche, insbesondere ist die Beinstütze an unterschiedlichsten Rollstuhl-Konstruktionen verwendbar. Sie ist abnehmbar und verschwenkbar und passt sich somit den jeweiligen Einsatzbedingungen an.The area of use of the legrest according to the invention extends over wide areas, in particular the legrest can be used on a wide variety of wheelchair constructions. It is removable and swiveling and thus adapts to the respective conditions of use.

Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels in Verbindung mit der Zeichnung beschrieben. Dabei zeigt:

Fig. 1
eine schematische Teilansicht eines Ausführungsbeispiels der erfindungsgemäßen Beinstütze, und
Fig. 2
eine Draufsicht auf die in Fig. 1 gezeigte Anordnung.
In the following the invention will be described by means of an embodiment in conjunction with the drawing. Showing:
Fig. 1
a schematic partial view of an embodiment of the legrest according to the invention, and
Fig. 2
a plan view of the arrangement shown in Fig. 1.

Die Figuren zeigen zunächst einen Ausschnitt aus einem Rollstuhlrahmen 8 mit einem schematisch dargestellten Sitzkissen 10. Über Lagerelemente 11, die einen Drehzapfen aufweisen, ist um eine vertikale Achse 9 schwenkbar ein Rahmenteil 1 gelagert. Das Rahmenteil 1 ist somit seitlich wegschwenkbar, so wie sich dies aus der Darstellung der Fig. 2 ergibt. Weiterhin kann das Rahmenteil 1 nach oben abgehoben und somit von dem Rollstuhlrahmen 8 getrennt werden.The figures initially show a section of a wheelchair frame 8 with a seat cushion 10 shown schematically. About bearing elements 11, which have a pivot, a frame part 1 is pivotally mounted about a vertical axis 9. The frame part 1 is thus pivotable laterally, as can be seen from the representation of FIG. 2. Furthermore, the frame part 1 can be lifted upwards and thus separated from the wheelchair frame 8.

An dem Rahmenteil 1 ist um eine im Wesentlichen horizontale Schwenkachse 12 verschwenkbar ein Trägerarm 2 gelagert, der ein Hauptteil 3 sowie eine teleskopisch an diesem gelagerte Schubstange 4 umfasst. Der Hauptteil 3 umfasst einen im einzelnen nicht gezeigten Linearantrieb, beispielsweise mit einer Spindel und einer Mutter sowie einem Gleichstrommotor. Durch Betätigung des Linearantriebes wird die Schubstange 4 relativ zu dem Hauptteil 3 ausgefahren bzw. zurückgezogen.On the frame part 1, a support arm 2 is mounted pivotably about a substantially horizontal pivot axis 12, comprising a main part 3 and a push rod 4 mounted telescopically thereon. The main part 3 comprises a linear drive, not shown in detail, for example with a spindle and a nut and a DC motor. By actuating the linear drive, the push rod 4 is extended or retracted relative to the main part 3.

An dem Hauptteil 3 ist mittels einer Schwenkachse 13 ein doppelt wirkender Kipphebel 5 gelagert, der ein erstes Hebelteil 5a und ein zweites Hebelteil 5b umfasst.On the main part 3, a double-acting rocker arm 5 is mounted by means of a pivot axis 13, which comprises a first lever part 5a and a second lever part 5b.

An dem ersten Hebelteil 5a ist über eine Schwenkachse 14 schwenkbar ein Druckstab 6 gelagert, dessen anderes Ende schwenkbar über eine Schwenkachse 15 an dem Rahmenteil 1 gelagert ist.On the first lever part 5a, a pressure rod 6 is pivotally mounted via a pivot axis 14, the other end of which is pivotally mounted on the frame part 1 via a pivot axis 15.

Das zweite Hebelteil 5b lagert, um eine Schwenkachse 16 verschwenkbar, einen Zugstab 7, welcher an seinem anderen Ende über eine Schwenkachse 17 mit der Schubstange 4 gekoppelt ist.The second lever part 5b supports, pivotable about a pivot axis 16, a tension rod 7, which is coupled at its other end via a pivot axis 17 with the push rod 4.

Die erfindungsgemäße Beinstütze bildet somit einen virtuellen Drehpunkt, der mit dem Drehpunkt bzw. der Drehachse des Knies des Benutzers des Rollstuhls durch Anordnung der Beinstütze an dem Rollstuhl zur Deckung gebracht wird. Hierdurch wird eine Relativbewegung zwischen der Beinstütze und dem Unterschenkel des abzustützenden Beins verhindert. Die erfindungsgemäße Beinstütze verlängert sich über den Verstellwinkel, somit findet eine Überlagerung einer rotatorischen Bewegung und einer translatorischen Bewegung der Fußplatte statt.The legrest according to the invention thus forms a virtual fulcrum, which is brought to coincide with the pivot point or the axis of rotation of the knee of the user of the wheelchair by placing the legrest on the wheelchair. As a result, a relative movement between the leg support and the lower leg of the leg to be supported is prevented. The legrest according to the invention extends over the adjustment angle, thus a superposition of a rotational movement and a translational movement of the base plate takes place.

Durch die erfindungsgemäße Ausgestaltung des Antriebs erfolgt eine Selbsthemmung, so dass das durch die Beinstütze gebildete Hebelgetriebe im unbetätigten Zustand ein statisch bestimmtes System bildet. Ein ungewolltes Absenken der Beinstütze wird somit verhindert.The inventive design of the drive is self-locking, so that the lever mechanism formed by the leg support forms a statically determined system in the unactuated state. An unwanted lowering of the legrest is thus prevented.

Um an der erfindungsgemäßen Beinstütze eine Fußplatte anzuordnen bzw. um ein Trägerrohr der Fußplatte aufzunehmen, weist die Schubstange 4 an ihrem freien Ende einen Lagerkopf 19 auf. Dieser kann in geeigneter Weise an die jeweiligen baulichen Anforderungen angepasst werden.In order to arrange a foot plate on the legrest according to the invention or to receive a support tube of the foot plate, the push rod 4 has a bearing head 19 at its free end. This can be suitably adapted to the respective structural requirements.

Weiterhin ist seitlich ein Waden-Polster 18 vorgesehen, um die Wade des Rollstuhl-Benutzers entsprechend abstützen zu können. Es versteht sich, dass erfindungsgemäß Schutzeinrichtugnen und/oder Polsterungen vorgesehen sein können, um insbesondere veränderliche Querschnitte des Druckstabs 6 und des Zugstabs 7 sowie des Kipphebels 5 abzudecken und die Gefahr eine Quetschung des Beins des Rollstuhl-Benutzers auszuschließen.Furthermore, a calf pad 18 is provided laterally to support the calf of the wheelchair user accordingly. It is understood that, according to the invention, protective devices and / or padding can be provided in order to cover in particular variable cross sections of the pressure rod 6 and the tension rod 7 and the rocker arm 5 and to eliminate the risk of pinching the leg of the wheelchair user.

Der elektrische Anschluss der erfindungsgemäßen Beinstütze kann über Kontaktstifte erfolgen, die beispielsweise im Bereich der Lagerung des Rahmenteils 1 an dem Rollstuhlrahmen 8 vorgesehen sein können. Es ist jedoch auch möglich, zusätzlich elektrische Kabel oder Stecker vorzusehen.The electrical connection of the legrest according to the invention can take place via contact pins, for example in the region of the mounting of the frame part 1 on the wheelchair frame 8 can be provided. However, it is also possible to provide additional electrical cable or plug.

Es ergibt sich, dass die erfindungsgemäße Beinstütze somit einen niedrigen und kurzen Aufbau aufweist, der die Bewegungsfreiheit des Rollstuhlfahrers nicht behindert. Weiterhin erfolgt ein automatischer Längenausgleich, der beispielsweise bei einem Verstellwinkel von 115° auf 180° den anatomischen Anforderungen in vollem Umfang gerecht wird.It follows that the legrest according to the invention thus has a low and short construction, which does not hinder the freedom of movement of the wheelchair user. Furthermore, there is an automatic length compensation, which fully meets the anatomical requirements, for example, at an adjustment angle of 115 ° to 180 °.

Durch die Abschwenkbarkeit und Abnehmbarkeit ist ein bequemes Ein- und Aussteigen sowie ein Heranfahren an Objekte ohne Unterfahrmöglichkeit gewährleistet.The Abschwenkbarkeit and removability is a comfortable entry and exit and approaching objects without Unterfahrmöglichkeit guaranteed.

Durch die kleine Baugröße und das geringe Gewicht wird die Handhabung der erfindungsgemäßen Beinstütze sehr erleichtert, so dass sowohl der Rollstuhlfahrer als auch Begleitpersonen diese problemlos handhaben können.Due to the small size and low weight, the handling of the legrest according to the invention is greatly facilitated, so that both the wheelchair user and escorts can handle this easily.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Rahmenteilframe part
22
Trägerarmsupport arm
33
HauptteilBulk
44
Schubstangepushrod
55
Kipphebelrocker arm
5a5a
erstes Hebelteilfirst lever part
5b5b
zweites Hebelteilsecond lever part
66
Druckstabpressure bar
77
Zugstabtension rod
88th
RollstuhlrahmenWheelchair frame
99
Achseaxis
1010
Sitzkissenseat cushions
1111
Lagerelementbearing element
1212
Schwenkachse - BeinstützeSwivel axis - legrest
1313
Schwenkachse - KipphebelSwivel axis - rocker arm
1414
Schwenkachse - Druckstab/KipphebelSwivel axis - push rod / rocker arm
1515
Schwenkachse - Druckstab/RahmenteilSwivel axis - pressure bar / frame part
1616
Schwenkachse - Zugstab/KipphebelSwivel axle - tie rod / rocker arm
1717
Schwenkachse - Zugstab/LagerkopfSwivel axle - tie rod / bearing head
1818
Polsterpad
1919
Lagerkopfbearing head

Claims (5)

  1. Wheelchair leg support for a wheelchair provided with a frame part (1), on which the leg support is mounted such that it can be pivoted,
    the leg support comprising a carrier arm (2) that can be pivotably mounted on the frame part (1),
    it being possible for the length of the carrier arm (2) to be varied and it comprising a main part (3) and a thrust rod (4) that can be telescoped relative thereto, the carrier arm (2) being provided in the free end region of its main part (3) with a pivotably mounted, double-sided rocking lever (5), whose first lever part (5a) is connected in an articulated manner to a compression rod (6) that can be mounted in an articulated manner on the frame part (1), and the free end region of the thrust rod (4) being connected in an articulated manner to the second lever part (5b) of the rocking lever (5) via a tension rod (7) mounted in an articulated manner on the said rocking lever (5),
    characterized in that the carrier arm comprises the drive and its length can be varied by means of this drive in the manner of a servomotor.
  2. Wheelchair leg support according to Claim 1, characterized in that the drive (2) comprises a linear drive.
  3. Wheelchair leg support according to Claim 1 or 2, characterized in that the frame part (1) can be mounted on a wheelchair frame (8) such that it can pivot about a substantially vertical axis (9).
  4. Wheelchair leg support according to one of Claims 1 to 3, characterized in that the frame part (1) can be mounted on the wheelchair such that it can be removed.
  5. Wheelchair leg support according to one of Claims 1 to 4, characterized in that a foot plate is mounted on the thrust rod (4).
EP03028738A 2003-01-13 2003-12-12 Pivotable leg support with automatic length adjustment for a wheelchair Expired - Lifetime EP1437114B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10300945A DE10300945B3 (en) 2003-01-13 2003-01-13 Angle-adjustable leg rest with automatic length compensation for a wheelchair
DE10300945 2003-01-13

Publications (2)

Publication Number Publication Date
EP1437114A1 EP1437114A1 (en) 2004-07-14
EP1437114B1 true EP1437114B1 (en) 2006-11-02

Family

ID=32478221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03028738A Expired - Lifetime EP1437114B1 (en) 2003-01-13 2003-12-12 Pivotable leg support with automatic length adjustment for a wheelchair

Country Status (6)

Country Link
EP (1) EP1437114B1 (en)
AT (1) ATE343996T1 (en)
DE (2) DE10300945B3 (en)
DK (1) DK1437114T3 (en)
ES (1) ES2275060T3 (en)
NO (1) NO325039B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2833850B1 (en) * 2012-04-05 2016-04-27 4 Power 4 SPRL Foot-rest for a wheelchair
US20220313523A1 (en) * 2019-09-12 2022-10-06 Fuji Corporation Assistance device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3043150A1 (en) * 1980-11-15 1982-09-09 Meyra - Krankenfahrzeugfabrik Wilhelm Meyer GmbH & Co. KG, 4973 Vlotho LEGREST FOR AN EMERGENCY ELEVATOR
US5033793A (en) * 1990-03-29 1991-07-23 Invacare Corporation Extendable elevating leg rest for a wheelchair
US5711580A (en) * 1996-09-13 1998-01-27 Advanced Mobility Systems Corporation Extendible and elevating footrest for wheelchair
GB2330299B (en) * 1997-10-07 2002-02-27 Sunrise Medical Ltd Leg support for wheelchair

Also Published As

Publication number Publication date
ES2275060T3 (en) 2007-06-01
DK1437114T3 (en) 2007-03-12
DE10300945B3 (en) 2004-07-29
EP1437114A1 (en) 2004-07-14
NO325039B1 (en) 2008-01-21
NO20040130L (en) 2004-07-14
DE50305563D1 (en) 2006-12-14
ATE343996T1 (en) 2006-11-15

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