Bages express wholesale clothing

EP0312961B1 - Wheelchair mountable to an endless-track vehicle - Google Patents

Wheelchair mountable to an endless-track vehicle Download PDF

info

Publication number
EP0312961B1
EP0312961B1EP88117252AEP88117252AEP0312961B1EP 0312961 B1EP0312961 B1EP 0312961B1EP 88117252 AEP88117252 AEP 88117252AEP 88117252 AEP88117252 AEP1EP 88117252AEP0 0312961 B1
Authority
EP
European Patent Office
Prior art keywords
wheelchair
vehicle
endless
track
adapter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88117252A
Other languages
German (de)
French (fr)
Other versions
EP0312961A1 (en
Inventor
Max Lehner
Original assignee
Max Lehner
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to AT2764 / 87ApriorityCriticalpatent / AT393251B / en
Priority to AT2764 / 87priority
Application filed by Max LehnerfiledCriticalMax Lehner
Publication of EP0312961A1publicationCriticalpatent / EP0312961A1 / en
Application granted granted Critical
Publication of EP0312961B1publicationCriticalpatent / EP0312961B1 / en
Anticipated expirationlegal-statusCritical
Expired - Lifetimelegal-statusCriticalCurrent

Left

  • 238000010168 coupling processMethods0.000claimsdescription24
  • 238000005859 coupling reactionMethods0.000claimsdescription23
  • 230000001808couplingEffects0.000claimsdescription21
  • 230000005484gravityEffects0.000claimsdescription10
  • 230000000875correspondingEffects0.000claimsdescription8
  • 238000003780insertionMethods0.000claims2
  • 230000001276 controlling effectEffects0.000claims1
  • 230000000750 progressiveEffects0.000claims1
  • 240000001307 Myosotis scorpioidesSpecies0.000description25
  • 241001325166Phacelia congestaSpecies0.000description10
  • 238000000034methodMethods0.000description8
  • 238000010276constructionMethods0.000description4
  • 230000001419dependentEffects0.000description3
  • 239000000463materialSubstances0.000description2
  • 210000000474HeelAnatomy0.000description1
  • 210000001503JointsAnatomy0.000description1
  • 210000003205MusclesAnatomy0.000description1
  • 206010033307OverweightDiseases0.000description1
  • 239000000969carrierSubstances0.000description1
  • 230000002493climbingEffects0.000description1
  • 230000023298 conjugation with cellular fusionEffects0.000description1
  • 230000000694effectsEffects0.000description1
  • 238000009434installationMethods0.000description1
  • 230000013011matingEffects0.000description1
  • 230000003387muscularEffects0.000description1
  • 235000020825overweightNutrition0.000description1
  • 239000004033plasticSubstances0.000description1
  • 230000001105regulatoryEffects0.000description1
  • 230000036633restEffects0.000description1
  • 230000000630risingEffects0.000description1
  • 230000014616translationEffects0.000description1
  • 230000021037unidirectional conjugationEffects0.000description1

Images

Classifications

    • 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 / 06 — Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, curbs or steps
    • A61G5 / 061 — Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps for climbing stairs
    • 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 / 06 — Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, curbs or steps
    • A61G5 / 066 — Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, curbs or steps with endless belts
    • 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 / 1054 — Large wheels, e.g. higher than the seat portion
    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B62 — LAND VEHICLES FOR TRAVELING OTHERWISE THAN ON RAILS
    • B62D — MOTOR VEHICLES; TRAILERS
    • B62D55 / 00 — Endless track vehicles
    • B62D55 / 06 — Endless track vehicles with tracks without ground wheels
    • B62D55 / 075 — Tracked vehicles for ascending or descending stairs, steep slopes or vertical surfaces
    • Y — GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10 — TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S — TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S180 / 00 — Motor vehicles
    • Y10S180 / 907 — Motorized wheelchairs
    • Y — GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10 — TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S — TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S280 / 00 — Land vehicles
    • Y10S280 / 10 — Stair climbing chairs

Description

  • The invention relates to a caterpillar undercarriage that can be coupled to a wheelchair, in particular for driving up stairs and ramps, the undercarriage part of which has the motor-driven caterpillars and fits between the main wheels of the wheelchair with an adapter for securing the wheelchair in a backward-tilted driving position in which the The invention relates to a caterpillar chassis that can be coupled to a wheelchair, in particular for driving up stairs and access ramps, the chassis part of which has the motor-driven caterpillars and fits between the main wheels of the wheelchair with an adapter for fastening the wheelchair in a tilted-back driving position in which the wheelchair bikes are lifted off the ground.
  • Such a wheelchair / crawler chassis combination is known from CH-A 608 436. It has the advantage that the connection between the two elements is only made when necessary and the wheelchair user has the opportunity to use the wheelchair for himself. The wheelchair user does not need to leave the wheelchair when coupling and uncoupling to and from the chassis. Preferably, caterpillars with highly profiled caterpillars made of rubber or rubber-like plastic material are used, two caterpillars being provided which can be driven separately via electric motors and gears, the travel speed and direction of travel being adjustable separately and together. One or more rechargeable batteries are usually used for the energy supply. The use of appropriate crawler tracks gives the wheelchair user greater mobility than the use of an always stationary, i.e. H. Elevators or stairlifts tied to stairs or buildings, the subsequent installation of which in existing buildings is also problematic. Since the tracked vehicle usually only covers short distances, it can be built lightly and the achievable travel speed is not critical either. Such a wheelchair-crawler chassis combination is known from CH-A 608 436. It has the advantage that the connection between the two elements is only made when necessary and the wheelchair user has the opportunity to use the wheelchair on his own. The wheelchair user does not have to leave the wheelchair when coupling and uncoupling to or from the chassis. Preferably, crawler tracks with strongly profiled caterpillars made of rubber or rubber-like plastic material are used, two caterpillars being provided which can be driven separately via electric motors and gears, the driving speed and direction of travel being separately and jointly adjustable. One or more rechargeable batteries are usually used for the energy supply. The use of appropriate crawler tracks gives the wheelchair user greater mobility than the use of a stationary or lift or stair lift that is always bound to stairs or buildings, the subsequent installation of which is also problematic in existing buildings. Since the caterpillar vehicle usually only covered short distances, it can be built easily and the achievable driving speed is also not critical. Carriage in motor vehicles is also possible.
  • In a known crawler undercarriage of the type in question, offered under the name "stair cooler", the entire adapter is mounted on the undercarriage so as to be pivotable about a transverse axis and can be locked in various pivoting positions. The backrest of the wheelchair is brought up to the adapter, which is in an approximately vertical position, and connected to the adapter via clamps or the like. By tilting the adapter with the attached wheelchair it is achieved according to a corresponding arrangement of the tilt axis that the wheelchair wheels lift off the ground in the tilted position, so that the wheelchair is only supported on the crawler chassis via the adapter. The adapter is preferably pulled up over the backrest to about the height of the head of the wheelchair user and equipped with handles that allow it to be pivoted, with control elements for switching the drive motors on and off and for regulating the drive speed being provided in the area of ​​these handles. Tilting the wheelchair is necessary so that the seat of the wheelchair does not lean forward when climbing stairs or any other steep incline. Regardless of whether they are going up or down a flight of stairs, the wheelchair user looks down the stairs. The known caterpillar chassis can only be coupled to the wheelchair by an assistant and it is also fundamentally provided that this auxiliary person operates and controls the chassis. This means that the wheelchair user is basically dependent on outside help for the use of the crawler track. When steering the chassis there are also problems for the auxiliary person, since the crawler chassis rests on the ground during the steering process and the auxiliary person has to stand behind the tipped wheelchair in order to be able to operate the handling. For these reasons, it is often impossible to use the known undercarriage of the kind described under the name "stairs cooler", the entire adapter on the undercarriage is pivotally mounted about a transverse axis and can be locked in different pivoting positions. The wheelchair is moved with the backrest to the approximately vertical position of the adapter and connected to the adapter via clamps or the like. By tilting the adapter with the attached wheelchair, according to a corresponding arrangement of the tilting axis, the wheelchair wheels are lifted off the ground in the tilted position, so that the wheelchair is only supported on the crawler chassis via the adapter. The adapter is preferably pulled up to about the head height of the wheelchair user beyond the backrest and equipped with handles by means of which it can be pivoted, control devices for switching the drive motors on and off and for regulating the drive speed being provided in the area of ​​these handles. Tilting the wheelchair is necessary so that the seat of the wheelchair does not lean forward when driving up stairs or another steep incline. Regardless of whether a person climbs or descends a staircase, the wheelchair user looks down the stairs. The known crawler chassis can only be coupled to the wheelchair by an auxiliary person and it is also fundamentally provided that this auxiliary person actuates and controls the chassis. This means that the wheelchair user is dependent on outside help for the use of the crawler chassis. When steering the chassis, problems also arise for the auxiliary person, since the crawler chassis lies on the ground during the steering process and the auxiliary person has to stand behind the tilted wheelchair for steering in order to be able to actuate the handling. For narrow stairs or stairs with only small heels For these reasons, it is often impossible to use the known undercarriages.
  • The object of the invention is to create a caterpillar chassis that can be coupled and uncoupled and controlled by the wheelchair user without having to leave the wheelchair, so that the wheelchair user is no longer dependent on outside help. A partial object of the invention is to create a construction which, compared to the known design, has a significantly increased maneuverability. The object of the invention is to provide a caterpillar chassis which can be coupled and uncoupled and controlled by the wheelchair user himself without having to leave the wheelchair, so that the wheelchair user is no longer dependent on outside help. A partial object of the invention is to create a construction which has a significantly increased maneuverability compared to the known embodiment.
  • A crawler undercarriage according to the invention is characterized in that the adapter, which has a retractable coupling for a corresponding mating coupling attached to the wheelchair, is connected to the chassis part via a lifting device, which is operated by the wheelchair user via actuating or control elements, either in the sense of lifting the wheelchair relative to the chassis and A caterpillar undercarriage according to the invention is characterized in that the adapter which has a retractable coupling for a corresponding mating clutch attached to the wheelchair is connected to the undercarriage part by means of a lifting device, which the wheelchair user can select via actuating or control elements in the sense of lifting the wheelchair relative to the undercarriage and in the sense of lifting the underca carriage with wheelchair wheels remaining on the ground, can be actuated both in the normal and in the tilted driving position.
  • A conventional wheelchair is much more manoeuvrable than a crawler track, unless you want to accept a very complicated drive and control device for the crawler track, which increases the total weight and the price significantly. The inventive design, it is now possible for the wheelchair user to selectively lift the crawler chassis and make tight turns or changes of direction around tight bends or around corners by controlled operation of the wheelchair himself. Even if only shorter journeys are to be covered between two uses of the crawler undercarriage, the arrangement according to the invention is advantageous because the wheelchair user has the option of covering such shorter journeys either with the crawler undercarriage or with the crawler undercarriage remaining on the wheelchair by operating the wheelchair wheels. The increased maneuverability in connection with an easily operated or automatically engaging retraction clutch enables the crawler chassis to be operated by the wheelchair user alone, who is no longer dependent on outside help. A conventional wheelchair has a much greater maneuverability than a crawler chassis, unless you want to accept a very complicated drive and control device for the crawler chassis, which increases the overall weight and the price significantly. The design according to the invention now makes it possible for the wheelchair user to selectively raise the crawler chassis and to carry out tighter turns or changes in direction of travel around tight curves or around corners by controlled actuation of the wheelchair itself. The arrangement according to the invention is also advantageous if only shorter travel distances have to be covered between two uses of the crawler chassis, since the wheelchair user has the option of such shorter travel distances optionally with the caterpillar undercarriage or with the caterpillar undercarriage remaining on the wheelchair by actuating the wheelchair wheels. The increased maneuverability in conjunction with an easy-to-use or automatically engaging retractable coupling enables the caterpillar chassis to be operated by the wheelchair user alone, who is therefore no longer dependent on outside help.
  • Pneumatic, hydraulic or electrical auxiliary drives can be provided for the functions of tilting the wheelchair in both directions, actuating the clutch in the coupling and disengaging direction, lifting the chassis and lifting the wheelchair, with auxiliary drives preferably equipped with electric motors when using an electrically driven crawler chassis, carry out the necessary adjustments via spindle drives, are foreseeable and to control the selected function within reach of the wheelchair user z. B. Push button switches are attached.Corresponding designs are naturally complex and are therefore only sensibly provided if the wheelchair user is so severely handicapped that manual operation cannot be expected of him. In the interests of a construction that is as simple and inexpensive as possible, efforts will be made to allow all or most of the functions mentioned to be performed by the wheelchair user using his or her muscular strength. Appropriate translations in the respective adjustment or drive branch can make things easier. Accordingly, a preferred embodiment consists, among other things, in that actuating levers are provided for the lifting device of the chassis within reach of the wheelchair user. The lifting device can be designed as a lever mechanism that can be fixed or secured in the two lifting positions (extended and raised chassis) via a locking mechanism. The locking mechanism is advantageously designed as an over-center locking mechanism having two over-center positions. Pneumatic, hydraulic or electrical auxiliary drives can be provided for the functions tilting the wheelchair in both directions, actuating the clutch in the direction of engagement and disengagement, lifting the undercarriage and lifting the wheelchair , with auxiliary drives, preferably equipped with electric motors when using an electrically driven crawler chassis, who make the necessary adjustments, for example via spindle drives, are predictable and to control the selected function within reach of the wheelchair user. B. Pushbutton switches can be attached. Corresponding explanations are of course complex and will therefore only be sensibly provided if the wheelchair user is so severely disabled that manual operation cannot be expected of him. In order to make the construction as simple and inexpensive as possible, efforts will be made to have all or most of the functions mentioned performed by the wheelchair user using his or her muscular strength. Corresponding translations in the respective adjustment or drive branch can make things easier. Accordingly, a preferred embodiment is, inter alia, that actuating levers are provided for the lifting device of the chassis within the reach of the wheelchair user. The lifting device can be designed as a lever mechanism, which can be locked or locked in the two lifting positions (extended and raised undercarriage). The locking mechanism is advantageously used as an over-center locking device having two over-center positions executed.
  • The tilt adjustment of the wheelchair can also be carried out by a wheelchair user with muscular strength who is not overly handicapped in the use of his hands and arms. You can provide at least one approximately horizontally protruding laterally over the seat area of ​​the wheelchair in the normal driving position, possibly removable holding rod on the adapter, on which the wheelchair user holds on and tilts his wheelchair or tilts back. A construction is possible in which the adapter, in contrast to the known in its entirety pivotable design, has a fixed, inclined support frame to support the wheelchair in the tilted position, on which support frame self-locking fuse holders for the wheelchair backrest or counter brackets are provided so that the wheelchair is secured in this tipping position at the end of the tipping process. The tilt adjustment of the wheelchair can also be carried out by a normally strong wheelchair user who is not overly disabled in the use of his hands and arms with muscle strength. It can be provided on the adapter at least one, possibly removable, handrail that protrudes approximately horizontally laterally to above the seat area of ​​the wheelchair in the normal driving position, to which the wheelchair user holds on and tilts or tilts his wheelchair back. There is a construction possible in which the adapter, in contrast to the known swiveling version in its entirety, has a fixed, oblique support frame for supporting the wheelchair in the tilted position, on which support frame automatically locking securing brackets for the wheelchair back or Counterholders provided there are provided so that the wheelchair is secured in this tilted position at the end of the tipping process. It is also possible to provide a step-by-step presetting of the inclination of the support frame to adapt to different stairs or terrain gradients.
  • This stop comes into permanent engagement with the guideway both when the wheelchair is tilted and when the chassis is lifted relative to the wheelchair, so that a reliable connection between the wheelchair and chassis is established with the simplest means, which can be released again simply by extending the wheelchair from the chassis .This stop comes with the guideway both when tilting the wheelchair and when lifting the chassis relative to the wheelchair in continuous intervention, so that a reliable connection between the wheelchair and chassis is established with the simplest of means, which can be easily released from the chassis by extending the wheelchair.
  • In order to ensure the maneuverability of the wheelchair-chassis unit, the total length of the chassis is not chosen to be significantly larger than the usual length of a wheelchair with a footrest, with the tilted backrest resting with its upper end approximately above the assigned chassis end. At this end of the chassis, the caterpillars will be led diagonally outwards / upwards so that they can safely grip the edges of stairs. According to a further development of the invention it is now provided that on the chassis or adapter in front of the end of the chassis lying under the backrest of the tilted wheelchair or under the end of the sloping caterpillar area, at least one support roller that can be adjusted to the ground via an actuator is attached. This support role can fulfill multiple functions. First of all, it gives the user the certainty that the chassis wheelchair unit will not gain excess weight to the rear if the wheelchair is quickly moved into the tilted position. An essential area of ​​application of the support roller is given when the wheelchair is tilted and the chassis is raised. In this situation, the wheelchair supported solely on its main wheels would be unstable. Apart from this, in the latter case, the support roller enables the wheelchair with the raised chassis to be turned practically in place by turning one main wheel forward and turning the other backward, without the need for complicated caterpillar controls for this turning process. When the wheelchair is tilted, the chassis is raised and the castor is extended, the wheelchair chassis unit is even more manoeuvrable than a wheelchair alone. This enables the user to maneuver the unit precisely and also to use narrow stairs with small steps. Maneuvering is facilitated by the fact that the support roller is mounted pivotably about a stationary axis in the manner of a spur or furniture wheel or is designed as a ball roller. In order to ensure the maneuverability of the wheelchair-chassis unit, the overall length of the chassis will not be significantly greater than the usual length of a wheelchair with footrest, with the tilted backrest with its upper end coming to lie approximately above the assigned chassis end. At this end of the undercarriage, the caterpillars will be guided diagonally outwards / upwards so that they can safely grip the edges of stairs. According to a further development of the invention, it is now provided that at least one support roller which can be set on the floor via an actuating drive is attached to the undercarriage or adapter in front of the undercarriage end under the backrest of the tilted wheelchair or under the end of the obliquely rising caterpillar area. This support role can perform multiple functions. First of all, it gives the user the certainty that the chassis wheelchair unit will not be overweight to the rear when the wheelchair is quickly moved into the tilted position. However, an essential area of ​​application of the support roller is when the wheelchair is tilted and when it is raised given chassis. In this situation, the wheelchair, which is supported solely on its main wheels, would be unstable. Apart from this, the support roller in the latter case makes it possible to turn the wheelchair with the raised undercarriage practically in place by turning one main wheel and turning the other main wheel backwards without the need for complicated caterpillar controls for this turning process. With a tilted wheelchair, raised chassis and extended roller, the wheelchair chassis unit is even more maneuverable than a wheelchair alone. This gives the user the opportunity to maneuver the unit precisely and to negotiate narrow stairs with small steps. Maneuvering is facilitated by the fact that the support roller is pivotably mounted about a standing axis in the manner of a spur or furniture wheel or is designed as a ball roller.
  • To simplify operation and to increase safety, provision can be made for the support roller to be forcibly extended in certain operating states and forcibly retracted in other operating states. For this purpose, the actuator of the support roller is drive-connected to the coupling pin or its own position sensor for the wheelchair that is sensitive to the tilting and raising or lowering of the chassis, so that it controls the support roller when tilting the wheelchair and / or lifting the chassis when the wheelchair is tilted and lifts off the floor when the wheelchair is in its normal driving position or when the chassis is lowered when the wheelchair is tilted. To simplify operation and to increase safety, it can be provided that the support roller is forcibly extended in certain operating states and forcibly retracted in other operating states. For this purpose, the actuator of the support roller is drive-connected to the coupling pin or its own position sensor for the wheelchair, which is sensitive to the tilting and raising or lowering of the chassis, so that it supports the support roller when the wheelchair is tilted and / or the chassis is raised when the wheelchair is tilted issues and lifts off the floor when the wheelchair is in its normal driving position or when the chassis is lowered when the wheelchair is tilted.
  • In the case of the known crawler tracks, the assistant who operates the chassis when driving up stairs has the option of pressing the adapter upwards, especially when driving downhill at the transition from the level route to the stairs, and thereby tilting the chassis in the direction of the stairs before the The overall focus of the wheelchair user, wheelchair and chassis was moved over the top edge of the stairs. Changes in position of the overall system that occur when the overall center of gravity is crossed over the edge mentioned are also softly intercepted by the assistant using force. Since the inventive design of the wheelchair user has the opportunity to drive alone, the aim is to avoid or mitigate the tilting processes mentioned when crossing the overall center of gravity over the edges leading from the flat to the slope. According to an embodiment, the crawler track has concave curved guide rails for the track stretches in contact with the ground, these track stretches either continuously following the rails or stretched over the arch with the help of their own tensioning devices, so that they are only attached to the arched ones in the event of punctiform loads Put on guide rails. In both cases it is achieved that the caterpillar gives way when driving over the mentioned edge leading from the level to the downward slope, so the chassis begins to adjust to the inclination of the stairs before the overall center of gravity has been moved over the edge. The same effect can be achieved if, according to another design, the chassis part is divided lengthwise into two or more separately drivable and articulated caterpillar groups connected to one another around a transverse axis, at least the caterpillar group pointing downhill can be pivoted downwards so that it In the known crawler tracks, the assistant who operates the landing gear when climbing stairs has the option of pushing the adapter upwards, in particular when driving downwards from the flat route to the stairs, and thereby tilting the undercarriage in the direction of the stairs before the latter total focus of wheelchair users, wheelchairs and chassis over the top of the stairs was moved. Changes in position of the overall system that occur over the aforementioned edge are also smoothly absorbed by the auxiliary person when force is exerted. Since the design according to the invention enables wheelchair users to drive alone, the aim is to avoid or mitigate the aforementioned tilting processes when crossing the center of gravity over the edges leading from the flat to the slope. According to one embodiment variant, the crawler track therefore has concavely curved guide rails for the caterpillar tracks which are in contact with the ground, these caterpillar tracks either being guided continuously along the tracks or being stretched over the curvature with the aid of their own tensioning devices so that they only engage the curved ones at point loads Place guide rails. In both cases it is achieved that when the mentioned caterpillar yields from the flat slope leading to the slope, the undercarriage already begins to adjust to the slope before the overall center of gravity has been moved over the edge. The same effect can be achieved if, according to another embodiment, the undercarriage part is divided longitudinally into two or more caterpillar groups which can be driven separately and are articulated about a transverse axis, at least the caterpillar group pointing down the stairs can be pivoted downwards so that it can be pivoted adapts to the incline of the stairs in advance.
  • Further details and advantages of the subject matter of the invention can be found in the following description of the drawings.
  • The subject matter of the invention is illustrated, for example, in the drawing. They show, each in a highly schematic representation in side view, in which a wheelchair is shown in dash-dotted lines and a chassis is shown in full,
  • Fig. 1
    a wheelchair / crawler track combination before the coupling connection is established,
    Fig. 2
    the combination according to FIG. 1 with the coupling produced, the wheelchair tilted, the chassis raised and the support roller extended,
    Fig. 3
    the combination when driving on a staircase,
    Fig. 4
    a first variant of the wheelchair-caterpillar chassis combination in a side view with a bottom guide rail for the caterpillars that is modified compared to the embodiment according to FIGS. 1 - 3,
    Figures 5-7
    Another variant of the wheelchair-caterpillar chassis combination in side view with a schematic representation of a device for damping the tilting movement of the chassis when driving over an edge leading from a plane to a slope or vice versa.
    The subject matter of the invention is illustrated in the drawing, for example. They show, each in a highly schematic representation in side view, in which a wheelchair is shown in full lines and a chassis,
    Fig. 1
    a wheelchair-crawler chassis combination before establishing the coupling connection,
    Fig. 2
    1 with the coupling manufactured, the wheelchair tilted, the undercarriage raised and the support roller extended,
    Fig. 3
    the combination when driving up a stair,
    Fig. 4
    2 shows a first variant of the wheelchair-crawler chassis combination in a side view with a bottom-side guide rail for the caterpillars which is modified compared to the embodiment according to FIGS. 1-3;
    5 - 7
    Another variant of the wheelchair-crawler chassis combination in side view with a schematic representation of a device for damping the tilting movement of the chassis when driving over an edge leading from planes to slopes or vice versa.
  • The crawler chassis-wheelchair combination consists of a wheelchair 1, a crawler chassis 2 and an adapter 3 for fastening and adjusting the wheelchair 1 relative to the chassis 2.
  • In the exemplary embodiment, a conventional, possibly collapsible wheelchair 1 has been shown in its outlines. The wheelchair 1 has a seat part 4, side armrests 5, a footrest 6, a backrest 7 with a pushing handle 8, main wheels with actuating rings 10 and support rollers 11. In the exemplary embodiment, a conventional, possibly collapsible wheelchair 1 was shown in its outlines. The wheelchair 1 has a seat part 4, side armrests 5, a footrest 6, a backrest 7 with a sliding handle 8, main wheels with actuating rings 10 and support rollers 11.
  • The chassis 2 has lower guide rails 12, 13 angled upwards at the right end and caterpillars 16 made of rubber or a rubber-like material, which are guided by drive and deflection wheels 14, 15, with electric motors with downstream gears being provided for the driven wheels, which are operated by a within the chassis 2 attached battery are supplied. Control units for switching the chassis on and off, for changing the speed and for reversing the direction of travel are attached at a point that can be reached by the wheelchair user, but have not been shown for the sake of clarity.