EP2403463B1 - Motorized wheelchair with anti-tip wheels - Google Patents
Motorized wheelchair with anti-tip wheels Download PDFInfo
- Publication number
- EP2403463B1 EP2403463B1 EP10708633.2A EP10708633A EP2403463B1 EP 2403463 B1 EP2403463 B1 EP 2403463B1 EP 10708633 A EP10708633 A EP 10708633A EP 2403463 B1 EP2403463 B1 EP 2403463B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- support arm
- wheelchair
- chassis
- wheelchair chassis
- holding structure
- 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.)
- Not-in-force
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Classifications
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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
- A61G5/08—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable
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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
- A61G5/08—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable
- A61G5/0875—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable dismountable, e.g. where the wheelchair can be disassembled for transportation or storage
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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
- A61G5/1089—Anti-tip devices
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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
- A61G5/04—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven
Definitions
- the present invention relates to the field of wheelchairs and in particular to a wheelchair chassis. More particularly, the present invention relates to a wheelchair chassis that can be stored in a space-saving manner.
- Wheelchairs, and in particular motorized wheelchairs are relatively encumbering devices. This characteristics stems from the fact that motorized wheelchairs, for example, are composed of a multitude of different parts that are arranged in a relatively narrow space in the chassis of the wheelchair.
- GB 2448110 discloses a foldable electric wheelchair.
- the problem of the high space requirements of wheelchairs is also important during transport of wheelchairs, for example to a maintenance workshop or due to travel of a wheelchair user. It is thus also an objective to provide a way to transport wheelchair or wheelchair chassis in a space-saving manner.
- the present invention also addresses the problem of providing a wheelchair chassis that can be partially dismounted and stored in a space-efficient way.
- the present invention further addresses the problem of a wheelchair or a wheelchair chassis that is transformable to a position of storage or transport, which covers less surface than when the wheelchair or wheelchair chassis is in a position of use.
- the present invention provides a wheelchair chassis comprising a pair of anti-tip wheels, wherein said wheelchair chassis has an horizontal position of use and a vertical position of storage, wherein each anti-tip wheel is provided on a curved support arm movably mounted with respect to said wheelchair chassis, and wherein, in said position of storage said curved support arm is in a position that is moved with respect to the position of use, in order to allow the wheelchair to be positioned in said vertical position.
- said curved support arm In said position of storage said curved support arm may be in a position that is rotated with respect to the position of use by an angle of about 90 to 270°.
- the wheelchair chassis may lie on motorized drive wheels and on said anti-tip wheels.
- Said anti-tip wheels may be provided on a rotable support arm, wherein in said position of storage the wheelchair chassis may lie on motorized drive wheels and on said anti-tip wheels.
- the curved support arm In a position of use, the curved support arm may be blocked against any rotation.
- Said curved support arm may be associated with a lock mechanism preventing rotation of said support arm in the position of use and/or in the position of storage.
- Said lock mechanism may be actuated and unlocked by hand.
- Said lock mechanism may comprise at least one pin, which, in a position of use and/or in a position of storage blocks any relative movement between said support arm and a holding structure provided on the chassis of the wheelchair.
- Said pin may engage said support arm and said holding structure in a position of use and/or in a position of storage and may be disengaged from one or both of said support arm and/or said holding structure by hand and/or without the need of a special tool.
- a disengagement of said pin from the support arm and/or said holding structure may allow the rotation of the support arm.
- One selected from said holding structure and the support arm may comprise a hollow cylindrical section and the respective other of said holding structure and the support arm may comprise a cylindrical or tubular section, wherein tubular section engages in said hollow cylindrical section.
- a hand-actuatable lock mechanism may prevent rotation of said tubular section in said hollow cylindrical section.
- Said support arm or said holding structure may comprise a limiting structure limiting transversal movement of the support arm with respect to said holding structure in at least one direction when the said lock mechanism is unlocked.
- Said support arm and said holding structure may both comprise an opening, wherein, in a position of use and/or in a position of storage, when relative movement between said support arm and said holding structure is blocked, the openings are aligned and said pin crosses said openings and thereby blocks said relative movement.
- the wheelchair chassis of the present invention may be the wheelchair chassis of a motorized wheelchair, wherein in said position of storage batteries are removed from the wheelchair chassis.
- the present invention also relates to a wheelchair comprising the chassis of the present invention.
- Figure 1 shows an embodiment of the wheelchair chassis 1 of the present invention. If compared to a completely assembled wheelchair, the chassis shown in Figures 1 differs in that the seat, arm and legrests of the complete wheelchair are removed.
- the perspective rear view of Figure 1 shows a pair of right and left motor wheels 6, 6', right and left rear anti-tip wheels 8, 8' and a right front castor wheel 7 (the left front castor wheel 7' not being visible in this view).
- the anti-tip wheels are connected at the end of right and left curved support arms 9, 9', respectively.
- a right motor 10 is visible, and together with a left motor (not visible), the motors are provided in order to propel the left and right motorized wheels 6, 6', respectively.
- the castor wheels 7, 7' and the motorized wheels 6, 6' are fixed to the chassis.
- the anti-tip wheels 8,8' are provided at the rear end of the left and right curved support arms 9, 9', said support arms being attached to swing arms being part of the chassis.
- the chassis 1 comprises a main, U-shaped frame element 11, the open end of the U being oriented towards the front.
- a horizontal frame element 12 is provided in a front area of the chassis.
- a pair of battery boxes 13, 14 is loaded on the chassis 1 at the rear of the wheelchair.
- the present invention concerns more specifically the arrangement of wheels other than the main drive or motorized wheels.
- the present invention is applicable to wheels such as idler wheels or anti-tip wheels of a wheelchair.
- Anti-tip wheels are typically provided as pairs of smaller wheels if compared to motorized or drive wheels. These pairs of smaller wheels are typically arranged towards the front or the rear end of a wheelchair and have, as a main purpose, the maintenance of the stability and/or maneuverability of a wheelchair. These smaller wheels are thus often provided at the rear-to-front extremities of a wheelchair and therefore determine the overall length and encumbrance of a wheelchair chassis.
- the present invention provides a possibility of change the orientation and/or position of such smaller wheels in order to allow a less encumbering, space-saving position of storage and transport for the wheelchair.
- situations and directions of elements of the wheelchair chassis of the present invention are determined by the perspective of a user seated in the completely assembled wheelchair. Accordingly, the left side of the wheelchair chassis 1 corresponds to the left side of Figure 1 .
- the situations or directions “up” or “top” and “down” or “bottom”, “rear” or “back” and “front”, “behind” and “in front”, “distal” and “proximal”, “lateral” and “central” follow the same rule.
- the principle of the present invention is illustrated at the example of the anti-tip wheels 8, 8' of the wheelchair chassis 1 shown in Figures 1 and 2 .
- Anti-tip wheels generally are not in touch with the ground on which a complete wheelchair moves, but may come in contact when a wheelchair is tipping over or runs on an obstacle. In these situations, the anti-tip wheels are provided to prevent falling over of the wheelchair.
- the left and right anti-tip wheels 8, 8' are mounted at the rear distal end of dedicated, left and right support arms 9, 9', which in turn are mounted at their front end to the chassis.
- FIG 2 is the same wheelchair chassis as shown in Figure 1 , with the battery boxes 13, 14 being removed, normally loaded on the rear end of the chassis 1 ( Figure 1 ).
- the embodiment of the wheelchair chassis shown in the figures of this specification is intended for storage or transport with the battery boxes being removed beforehand.
- the present invention also encompasses the possibility that the battery boxes stay on the wheelchair chassis when the wheelchair chassis is prepared or placed in a position for storage, as detailed further below.
- each anti-tip wheel support arm 9, 9' comprises a nearly horizontal, front profile section 20, a bent section 22 and a rear, nearly vertical anti-tip wheel carrying section 21.
- the angle ⁇ that the front profile section 20 deviates from horizontal is actually important for enabling storage of the wheelchair chassis in a space-saving manner.
- FIG. 3b In particular in Figures 3b and in the perspective, closer view of Figure 4 , of the right anti-tip wheel, it can be seen that the rear portion 20 of the support arm 9 is guided in a tubular element 25, which thus functions as a holding structure having a hollow cylindrical configuration.
- the holding structure 25 is rigidly connected to the chassis 1, for example by welding or screwing, and more particularly to a lateral frame bar 30, which carries, on its lower side, the motor of the motorized wheel.
- the right motorized wheel is removed in Figures 3b and 4 for the reason of clarity.
- the support arm 9 carries, at its lower, rear end, a fork 23, in which the anti-tip wheel 8 is turnably mounted.
- Figure 5 shows the support arm 9 of the right anti-tip wheel 8 being removed from the tubular element 25 and therefore also from the wheelchair chassis 1.
- a sleeve 28 provided on the front, substantially horizontal portion 20 of the support arm 9 can well be seen in Figure 5 .
- This sleeve abuts against the rear end of the tubular element 25 when the support arm 9 is inserted, as can be seen in Figures 3a, 3b and 4.
- Figure 5 further shows a clasp 32 comprising two pins 31.
- the clasp 32 is situated inside the front profile section 20 of the support arm 9.
- the pins 31 pass through holes 33 in the front profile section 20 and also through similar holes 29 in the tubular element 25 ( Figures 3a, 3b , 4 ).
- said clasp 32 thus achieves a rigid but detachable connection between the support arm 9 and the tubular element 25 and thus links the support arm 9 to the chassis 1.
- this mechanism functions as a lock mechanism and is capable of blocking any rotational movement of the support arm 9 in said tubular element 25 and also any transversal movement of the front profile section 20 of the support arm 9 in the tubular holding element.
- the pins 31 ( Figure 5 ) are accessible from the outside in a position of use of the wheelchair chassis, and even of the completely assembled wheelchair, as they pass through the hole 33 in the support arm 9 and also through hole 29 in the holding structure 25.
- a wheelchair user or any other person can push said pins back when grasping the holding structure 25, thereby disengaging the pins from the hole 29 of the holding structure 25.
- the support arm 9 becomes unblocked from the holding structure and is free to move transversally within said holding structure 25 towards the rear.
- the arrow in Figure 6 illustrates how the support arm 9 is transversally drawn in the rear direction while being guided in the tubular holding structure 25.
- the extent of movement can be recognized at the position of the retainer sleeve 28, which, in the positions of use shown in Figures 3a, 3b and 4 , abuts against the holding structure 25.
- the retainer sleeve 28 is situated at a distance of several centimeters away from the rear end of the tube of the holding structure 25.
- the support arm can, however, be blocked in the upward position of the anti-tip wheels by pushing the support arm transversally back into the holding structure 25, as is illustrated by the arrow in Figures 9a and 9b .
- the support arm 9 is pushed until the sleeve 28 on said support arm abuts again on the rear end of the tube of the holding structure 25. If, in this position, the support arm is rotated until an exact vertical position of the rear section 21 is obtained, the pins 31 ( Figure 5 ) in the support arm 9 will again pass through the holes 29 in the holding structure 25 and thereby block further rotational and transversal movement of the support arm 9.
- the clasp 32 shown in Figure 5 is such that two pins 31 are diametrically opposed with respect to each other (180°).
- the rear section 20 of the support arm 9 actually comprises two holes 33, a second hole being provided diametrically opposed (not visible in Figure 5 ).
- the holding structure 25 comprises two holes 29, of which the second one is diametrically opposed and cannot be seen in the figures. This arrangement is such that when the support arm is rotated by exactly 180°, the pins 31 can again be moved into the holes 33 and 29. Then the pins block the support arm in a position that is rotated by 180° with respect to the previously blocked position.
- FIGs 10 and 11 show a space-saving position of the wheelchair chassis shown in the previous figures. This position is useful for storage of the wheelchair chassis when not needed, for example in a maintenance workshop, or for transport. This position is obtained by tilting the front of the wheelchair chassis up-wards and rotating the wheelchair chassis around the main motorized wheels, until the longitudinal rear-to-front dimension of the wheelchair chassis is oriented vertically. The wheelchair chassis is then stabilized and supported on the main wheels 6, 6' and on the anti-tip wheels 8, 8'. As was mentioned above, the anti-tip wheels usually do not touch the ground when the assembled wheelchair is in a horizontal position of use. However, in the vertical position of storage of the wheelchair chassis shown in Figures 10 and 11 , the anti-tip wheels touch the ground and support the wheelchair chassis in this position.
- the front section 20 of the support arm 9 has a close to horizontal position, but is slightly skewed upwards towards the rear, thereby enclosing an angle ⁇ with respect to horizontal.
- the careful adjustment of this angle is important not only in order to assure the proper functioning of the anti-tip function of the anti-tip wheels in the assembled wheelchair, but also for assuring that the rear section 21 of the anti-tip wheels assumes a substantially vertical or close to vertical configuration following the up-ward pivoting of the support arm as shown in Figures 7 , 8, 9a, 9b .
- the angle ⁇ is thus related to the angle between the front and rear sections 20 and 21 of the curved support arm 9. More specifically, angle ⁇ corresponds to the angle enclosed between said front and rear sections 20 and 21 of the curved support arm 9 minus 90°.
- the length of the various elements of the support arm 9 is relevant as well as the position of attachment of the arm on the chassis with respect to the ground. The skilled person will be able to vary these elements when necessary or desirable for other reasons.
- the axis of pivoting of the support arm 9 in the holding structure 25 lies in a plane that is vertically extending in the longitudinal, rear to front direction of the wheelchair chassis. Deviations of this situation of the axis are possible.
- the support arms could be oriented slightly outwardly, in which case the axis of pivoting would be provided at an angle ⁇ (not shown) of about 0-70° from a vertical rear-to front longitudinal plane.
- the anti-tip wheels are provided in a rear position of the wheelchair chassis.
- the anti-tip wheels are constructed with the anti-tip wheels provided in the front of the wheelchair.
- the present invention analogously also applies to wheelchairs with front anti-tip wheels.
- the rear portion 20 of the support arms 9, 9' is not guided in a tubular element 25, but is mounted in articulation onto the chassis (or onto another element fixed to the chassis or to a swing arm being part of the chassis, such as for example the tube 25), for example through a universal or cardan joint, so as to be able to be pivoted to serve as support when the wheelchair chassis is in its vertical position of storage, so that the wheelchair chassis can be stabilised and supported on the main wheels 6, 6' and on the anti-tip wheels 8, 8'.
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Description
- The present invention relates to the field of wheelchairs and in particular to a wheelchair chassis. More particularly, the present invention relates to a wheelchair chassis that can be stored in a space-saving manner.
- Wheelchairs, and in particular motorized wheelchairs are relatively encumbering devices. This characteristics stems from the fact that motorized wheelchairs, for example, are composed of a multitude of different parts that are arranged in a relatively narrow space in the chassis of the wheelchair.
-
GB 2448110 - In wheelchair fabrication units and maintenance workshops a high number of wheelchairs and wheelchair chassis are generally stored. It is an objective of the present invention to provide a wheelchair or a wheelchair chassis that can be stored in space-saving manner.
- The problem of the high space requirements of wheelchairs is also important during transport of wheelchairs, for example to a maintenance workshop or due to travel of a wheelchair user. It is thus also an objective to provide a way to transport wheelchair or wheelchair chassis in a space-saving manner.
- The present invention also addresses the problem of providing a wheelchair chassis that can be partially dismounted and stored in a space-efficient way.
- The present invention further addresses the problem of a wheelchair or a wheelchair chassis that is transformable to a position of storage or transport, which covers less surface than when the wheelchair or wheelchair chassis is in a position of use.
- The present invention provides a wheelchair chassis comprising a pair of anti-tip wheels, wherein said wheelchair chassis has an horizontal position of use and a vertical position of storage, wherein each anti-tip wheel is provided on a curved support arm movably mounted with respect to said wheelchair chassis, and wherein, in said position of storage said curved support arm is in a position that is moved with respect to the position of use, in order to allow the wheelchair to be positioned in said vertical position.
- In said position of storage said curved support arm may be in a position that is rotated with respect to the position of use by an angle of about 90 to 270°.
- In said position of storage, the wheelchair chassis may lie on motorized drive wheels and on said anti-tip wheels.
- Said anti-tip wheels may be provided on a rotable support arm, wherein in said position of storage the wheelchair chassis may lie on motorized drive wheels and on said anti-tip wheels.
- In a position of use, the curved support arm may be blocked against any rotation.
- Said curved support arm may be associated with a lock mechanism preventing rotation of said support arm in the position of use and/or in the position of storage.
- Said lock mechanism may be actuated and unlocked by hand.
- Said lock mechanism may comprise at least one pin, which, in a position of use and/or in a position of storage blocks any relative movement between said support arm and a holding structure provided on the chassis of the wheelchair.
- Said pin may engage said support arm and said holding structure in a position of use and/or in a position of storage and may be disengaged from one or both of said support arm and/or said holding structure by hand and/or without the need of a special tool.
- A disengagement of said pin from the support arm and/or said holding structure may allow the rotation of the support arm.
- One selected from said holding structure and the support arm may comprise a hollow cylindrical section and the respective other of said holding structure and the support arm may comprise a cylindrical or tubular section, wherein tubular section engages in said hollow cylindrical section.
- A hand-actuatable lock mechanism may prevent rotation of said tubular section in said hollow cylindrical section.
- Said support arm or said holding structure may comprise a limiting structure limiting transversal movement of the support arm with respect to said holding structure in at least one direction when the said lock mechanism is unlocked.
- Said support arm and said holding structure may both comprise an opening, wherein, in a position of use and/or in a position of storage, when relative movement between said support arm and said holding structure is blocked, the openings are aligned and said pin crosses said openings and thereby blocks said relative movement.
- The wheelchair chassis of the present invention may be the wheelchair chassis of a motorized wheelchair, wherein in said position of storage batteries are removed from the wheelchair chassis.
- The present invention also relates to a wheelchair comprising the chassis of the present invention.
- The wheelchair chassis of the present invention will be described in further detail further below, when useful with reference to the drawings, which show an exemplary wheelchair according to the invention.
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Figure 1 is a rear perspective view showing the base or chassis of a wheelchair according to an embodiment of the invention. The base shows a motorized wheelchair chassis from which the seat construction including arm and legrests were removed. -
Figure 2 is a rear perspective view of the same wheelchair chassis as shown inFigure 1 , with battery boxes being removed. -
Figure 3a is a right side view to the embodiment of a wheelchair chassis shown inFigure 1 . -
Figure 3b is an extract ofFigure 3a showing in more detail the support arm of the anti-tip wheel and its connection the wheelchair chassis. -
Figure 4 is rear perspective view of the anti-tip wheel shown inFigure 3b and its connection the wheelchair chassis. -
Figure 5 is a front perspective view of the right support arm of the right anti-tip wheel, the support arm being removed from the chassis of the wheelchair shown in the previous figures. -
Figure 6 is the same lateral closer extract view asFigure 4 , with the right support arm of the anti-tip wheel being drawn in the direction of the arrow. -
Figure 7 is the same view asFigure 3 , with the right support arm being pivoted upwardly for preparing a position of storage. -
Figure 8 is an extract ofFigure 7 showing in more detail the rear right anti-tip wheel and the support arm on the position ofFigure 7 . -
Figure 9a is the same lateral view asFigures 3a andFigure 7 , with the support arm of the right anti-tip wheel being pushed back in a holding structure as indicated by the arrow. -
Figure 9b is an extract ofFigure 9a showing in a closer view the arrangement of the support arm and the structure by which it is attached to the chassis. -
Figure 10 is a right side view to the wheelchair chassis ofFigure 2 in a vertical position of storage, with the support arms of the anti-tip wheels being pivoted into the position shown inFigure 7 . -
Figure 11 is a rear perspective view of the wheelchair chassis as shown inFigure 10 . -
Figure 1 shows an embodiment of thewheelchair chassis 1 of the present invention. If compared to a completely assembled wheelchair, the chassis shown inFigures 1 differs in that the seat, arm and legrests of the complete wheelchair are removed. The perspective rear view ofFigure 1 shows a pair of right andleft motor wheels 6, 6', right and left rearanti-tip wheels 8, 8' and a right front castor wheel 7 (the left front castor wheel 7' not being visible in this view). The anti-tip wheels are connected at the end of right and leftcurved support arms 9, 9', respectively. A right motor 10 is visible, and together with a left motor (not visible), the motors are provided in order to propel the left and right motorizedwheels 6, 6', respectively. Thecastor wheels 7, 7' and the motorizedwheels 6, 6' are fixed to the chassis. Theanti-tip wheels 8,8' are provided at the rear end of the left and rightcurved support arms 9, 9', said support arms being attached to swing arms being part of the chassis. Thechassis 1 comprises a main, U-shaped frame element 11, the open end of the U being oriented towards the front. Ahorizontal frame element 12 is provided in a front area of the chassis. A pair ofbattery boxes chassis 1 at the rear of the wheelchair. - The present invention concerns more specifically the arrangement of wheels other than the main drive or motorized wheels. For example, the present invention is applicable to wheels such as idler wheels or anti-tip wheels of a wheelchair. Anti-tip wheels are typically provided as pairs of smaller wheels if compared to motorized or drive wheels. These pairs of smaller wheels are typically arranged towards the front or the rear end of a wheelchair and have, as a main purpose, the maintenance of the stability and/or maneuverability of a wheelchair. These smaller wheels are thus often provided at the rear-to-front extremities of a wheelchair and therefore determine the overall length and encumbrance of a wheelchair chassis. The present invention provides a possibility of change the orientation and/or position of such smaller wheels in order to allow a less encumbering, space-saving position of storage and transport for the wheelchair.
- For the purpose of the present specification, situations and directions of elements of the wheelchair chassis of the present invention are determined by the perspective of a user seated in the completely assembled wheelchair. Accordingly, the left side of the
wheelchair chassis 1 corresponds to the left side ofFigure 1 . The situations or directions "up" or "top" and "down" or "bottom", "rear" or "back" and "front", "behind" and "in front", "distal" and "proximal", "lateral" and "central" follow the same rule. - In the embodiment shown in the figures, the principle of the present invention is illustrated at the example of the
anti-tip wheels 8, 8' of thewheelchair chassis 1 shown inFigures 1 and 2 . Anti-tip wheels generally are not in touch with the ground on which a complete wheelchair moves, but may come in contact when a wheelchair is tipping over or runs on an obstacle. In these situations, the anti-tip wheels are provided to prevent falling over of the wheelchair. In the wheelchair chassis shown inFigures 1 and 2 , as mentioned above, the left and rightanti-tip wheels 8, 8' are mounted at the rear distal end of dedicated, left andright support arms 9, 9', which in turn are mounted at their front end to the chassis. -
Figure 2 is the same wheelchair chassis as shown inFigure 1 , with thebattery boxes Figure 1 ). The embodiment of the wheelchair chassis shown in the figures of this specification is intended for storage or transport with the battery boxes being removed beforehand. However, the present invention also encompasses the possibility that the battery boxes stay on the wheelchair chassis when the wheelchair chassis is prepared or placed in a position for storage, as detailed further below. - In the lateral views of
Figures 3a and 3b , the right side of the wheelchair chassis of the same embodiment is shown. The description of the right side also applies, as the skilled person will understand, also to the left side of the wheelchair chassis, where analogous structures are provided. It can be seen that each anti-tipwheel support arm 9, 9' comprises a nearly horizontal,front profile section 20, abent section 22 and a rear, nearly vertical anti-tipwheel carrying section 21. As will be discussed further below, the angle α that thefront profile section 20 deviates from horizontal is actually important for enabling storage of the wheelchair chassis in a space-saving manner. - In particular in
Figures 3b and in the perspective, closer view ofFigure 4 , of the right anti-tip wheel, it can be seen that therear portion 20 of thesupport arm 9 is guided in atubular element 25, which thus functions as a holding structure having a hollow cylindrical configuration. The holdingstructure 25 is rigidly connected to thechassis 1, for example by welding or screwing, and more particularly to alateral frame bar 30, which carries, on its lower side, the motor of the motorized wheel. The right motorized wheel is removed inFigures 3b and4 for the reason of clarity. Thesupport arm 9 carries, at its lower, rear end, afork 23, in which theanti-tip wheel 8 is turnably mounted. -
Figure 5 shows thesupport arm 9 of theright anti-tip wheel 8 being removed from thetubular element 25 and therefore also from thewheelchair chassis 1. Asleeve 28 provided on the front, substantiallyhorizontal portion 20 of thesupport arm 9 can well be seen inFigure 5 . This sleeve abuts against the rear end of thetubular element 25 when thesupport arm 9 is inserted, as can be seen inFigures 3a, 3b and4. Figure 5 further shows aclasp 32 comprising twopins 31. In the position of use of the wheelchair, as exemplified inFigures 3a, 3b and4 showing the wheelchair chassis (and also in the position of storage, as will be described below) theclasp 32 is situated inside thefront profile section 20 of thesupport arm 9. Thereby, thepins 31 pass throughholes 33 in thefront profile section 20 and also throughsimilar holes 29 in the tubular element 25 (Figures 3a, 3b ,4 ). By way of thepins 31, saidclasp 32 thus achieves a rigid but detachable connection between thesupport arm 9 and thetubular element 25 and thus links thesupport arm 9 to thechassis 1. As the skilled person will note, this mechanism functions as a lock mechanism and is capable of blocking any rotational movement of thesupport arm 9 in saidtubular element 25 and also any transversal movement of thefront profile section 20 of thesupport arm 9 in the tubular holding element. - In the following, we describe the unblocking of the lock mechanism provided by said
clasp 32, and the rotation of the anti-tip wheels for the purpose of achieving a space-saving position of storage and transport of the wheelchair chassis of the present invention. - As appears from the previously discussed figures, the pins 31 (
Figure 5 ) are accessible from the outside in a position of use of the wheelchair chassis, and even of the completely assembled wheelchair, as they pass through thehole 33 in thesupport arm 9 and also throughhole 29 in the holdingstructure 25. A wheelchair user or any other person can push said pins back when grasping the holdingstructure 25, thereby disengaging the pins from thehole 29 of the holdingstructure 25. In so doing, thesupport arm 9 becomes unblocked from the holding structure and is free to move transversally within said holdingstructure 25 towards the rear. - The arrow in
Figure 6 illustrates how thesupport arm 9 is transversally drawn in the rear direction while being guided in thetubular holding structure 25. The extent of movement can be recognized at the position of theretainer sleeve 28, which, in the positions of use shown inFigures 3a, 3b and4 , abuts against the holdingstructure 25. InFigure 6 , in contrast, theretainer sleeve 28 is situated at a distance of several centimeters away from the rear end of the tube of the holdingstructure 25. - In the position shown in
Figure 6 , the holes 33 (Figure 5 ) of thesupport arm 9 and theholes 29 provided in the holdingstructure 25 are no longer aligned, and the pins 31 (Figure 5 ), thus do no longer block the movement of thesupport arm 9 with respect to thechassis 1. Thanks to the tubular or cylindrical configuration of thefront section 20 of thesupport arm 9, which is housed in a hollow cylindrical bearing provided by thetubular holding structure 25, also a rotational movement of the support arm is now possible. - In
Figures 7 and8 , the rotation of the support arm by about 180° is shown. In this position, theanti-tip wheel 8 is directed to the top, and therear section 21 of thesupport arm 9 is oriented in a close to vertical position. Also in the upwardly rotated position shown inFigures 7 and8 , the support arm is not blocked and still free to further move and/or rotate. In particular, it can be seen that the position of thesleeve 28 still is removed from the rear end of the holdingstructure 25. - The support arm can, however, be blocked in the upward position of the anti-tip wheels by pushing the support arm transversally back into the holding
structure 25, as is illustrated by the arrow inFigures 9a and 9b . As can be better seen in the enlargedFigure 9b , thesupport arm 9 is pushed until thesleeve 28 on said support arm abuts again on the rear end of the tube of the holdingstructure 25. If, in this position, the support arm is rotated until an exact vertical position of therear section 21 is obtained, the pins 31 (Figure 5 ) in thesupport arm 9 will again pass through theholes 29 in the holdingstructure 25 and thereby block further rotational and transversal movement of thesupport arm 9. - As the skilled person will understand, the
clasp 32 shown inFigure 5 is such that twopins 31 are diametrically opposed with respect to each other (180°). Accordingly, therear section 20 of thesupport arm 9 actually comprises twoholes 33, a second hole being provided diametrically opposed (not visible inFigure 5 ). Similarly, the holdingstructure 25 comprises twoholes 29, of which the second one is diametrically opposed and cannot be seen in the figures. This arrangement is such that when the support arm is rotated by exactly 180°, thepins 31 can again be moved into theholes -
Figures 10 and 11 show a space-saving position of the wheelchair chassis shown in the previous figures. This position is useful for storage of the wheelchair chassis when not needed, for example in a maintenance workshop, or for transport. This position is obtained by tilting the front of the wheelchair chassis up-wards and rotating the wheelchair chassis around the main motorized wheels, until the longitudinal rear-to-front dimension of the wheelchair chassis is oriented vertically. The wheelchair chassis is then stabilized and supported on themain wheels 6, 6' and on theanti-tip wheels 8, 8'. As was mentioned above, the anti-tip wheels usually do not touch the ground when the assembled wheelchair is in a horizontal position of use. However, in the vertical position of storage of the wheelchair chassis shown inFigures 10 and 11 , the anti-tip wheels touch the ground and support the wheelchair chassis in this position. - With reference to
Figure 3b it is noted that thefront section 20 of thesupport arm 9 has a close to horizontal position, but is slightly skewed upwards towards the rear, thereby enclosing an angle α with respect to horizontal. The careful adjustment of this angle is important not only in order to assure the proper functioning of the anti-tip function of the anti-tip wheels in the assembled wheelchair, but also for assuring that therear section 21 of the anti-tip wheels assumes a substantially vertical or close to vertical configuration following the up-ward pivoting of the support arm as shown inFigures 7 ,8, 9a, 9b . The angle α is thus related to the angle between the front andrear sections curved support arm 9. More specifically, angle α corresponds to the angle enclosed between said front andrear sections curved support arm 9 minus 90°. - As the skilled person will understand, also the length of the various elements of the
support arm 9 is relevant as well as the position of attachment of the arm on the chassis with respect to the ground. The skilled person will be able to vary these elements when necessary or desirable for other reasons. - In the embodiment shown in the figures, the axis of pivoting of the
support arm 9 in the holdingstructure 25 lies in a plane that is vertically extending in the longitudinal, rear to front direction of the wheelchair chassis. Deviations of this situation of the axis are possible. For example, the support arms could be oriented slightly outwardly, in which case the axis of pivoting would be provided at an angle β (not shown) of about 0-70° from a vertical rear-to front longitudinal plane. - In the embodiment of the wheelchair chassis shown in the figures, the anti-tip wheels are provided in a rear position of the wheelchair chassis. There are many wheelchairs that are constructed with the anti-tip wheels provided in the front of the wheelchair. The present invention analogously also applies to wheelchairs with front anti-tip wheels.
- According to another embodiment of the present invention, not represented on the drawings, the
rear portion 20 of thesupport arms 9, 9' is not guided in atubular element 25, but is mounted in articulation onto the chassis (or onto another element fixed to the chassis or to a swing arm being part of the chassis, such as for example the tube 25), for example through a universal or cardan joint, so as to be able to be pivoted to serve as support when the wheelchair chassis is in its vertical position of storage, so that the wheelchair chassis can be stabilised and supported on themain wheels 6, 6' and on theanti-tip wheels 8, 8'.
Claims (16)
- A wheelchair chassis (1) comprising a pair of anti-tip wheels (8, 8'), wherein said wheelchair chassis has an horizontal position of use and a vertical position of storage, wherein each anti-tip wheel is provided on a curved support arm (9, 9'), characterized in that said curved support arm is movably mounted with respect to said wheelchair chassis, and in that, in said position of storage said curved support arm is in a position that is moved with respect to the position of use, in order to allow the wheelchair chassis to be positioned in said vertical position.
- The wheelchair chassis of claim 1, wherein in said position of storage said curved support arm (9, 9') is in a position that is rotated with respect to the position of use by an angle of about 90 to 270°.
- The wheelchair chassis of claim 1, wherein in said position of storage, the wheelchair chassis lies on motorized drive wheels (6, 6') and on said anti-tip wheels (8, 8').
- The wheelchair chassis of any one of the preceding claims, wherein said anti-tip wheels (8, 8') are provided on a rotable support arm (9, 9'), and wherein in said position of storage the wheelchair chassis lies on motorized drive wheels (6, 6') and on said anti-tip wheels (8, 8').
- The wheelchair chassis of any one of the preceding claims, wherein, in a position of use, the curved support arm (9, 9') is blocked against any rotation.
- The wheelchair chassis of any one of the preceding claims, wherein said curved support arm (9, 9') is associated with a lock mechanism (29, 32, 31, 33) preventing rotation of said support arm in the position of use and/or in the position of storage.
- The wheelchair chassis of claim 6, wherein said lock mechanism (29, 32, 31, 33) can be actuated and unlocked by hand.
- The wheelchair chassis of any one of claims 6 and 7, wherein said lock mechanism (29, 32, 31, 33) comprises at least one pin (31), which, in a position of use and/or in a position of storage blocks any relative movement between said support arm and a holding structure (25) provided on the chassis (5) of the wheelchair.
- The wheelchair chassis of claim 8, wherein said pin (31) engages said support arm (9, 9') and said holding structure (25) in a position of use and/or in a position of storage and can be disengaged from one or both of said support arm and/or said holding structure by hand and/or without the need of a special tool.
- The wheelchair chassis of claim 9, wherein a disengagement of said pin (31) from the support arm (9, 9') and/or said holding structure (25) allows the rotation of the support arm.
- The wheelchair chassis of any one of claims 8-10, wherein one selected from said holding structure (25) and the support arm (9, 9') comprises a hollow cylindrical section and the respective other of said holding structure and the support arm comprises a cylindrical or tubular section, wherein tubular section engages in said hollow cylindrical section.
- The wheelchair chassis of claim 11, wherein a hand-actuatable lock mechanism (29, 32, 31, 33) prevents rotation of said tubular section in said hollow cylindrical section.
- The wheelchair chassis of any one of claims 6-12, wherein said support arm (9, 9') or said holding structure (25) comprises a limiting structure (28) limiting transversal movement of the support arm with respect to said holding structure in at least one direction when the said lock mechanism (29, 32, 31, 33) is unlocked.
- The wheelchair chassis of any one of the preceding claims, wherein said support arm (9, 9') and said holding structure (25) both comprise an opening (29, 33), wherein, in a position of use and/or in a position of storage, when relative movement between said support arm and said holding structure is blocked, the openings are aligned and said pin (31) crosses said openings and thereby blocks said relative movement.
- The wheelchair chassis of any one of the preceding claims, which is the wheelchair chassis of a motorized wheelchair, and wherein in said position of storage batteries (13, 14) are removed from the wheelchair chassis.
- A wheelchair comprising a chassis according to anyone of the preceding claims.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10708633.2A EP2403463B1 (en) | 2009-03-02 | 2010-03-02 | Motorized wheelchair with anti-tip wheels |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09154153A EP2226049A1 (en) | 2009-03-02 | 2009-03-02 | Motorized wheelchair with anti-tip wheels |
PCT/IB2010/050895 WO2010100605A1 (en) | 2009-03-02 | 2010-03-02 | Motorized wheelchair with anti-tip wheels |
EP10708633.2A EP2403463B1 (en) | 2009-03-02 | 2010-03-02 | Motorized wheelchair with anti-tip wheels |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2403463A1 EP2403463A1 (en) | 2012-01-11 |
EP2403463B1 true EP2403463B1 (en) | 2014-10-22 |
Family
ID=40897690
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09154153A Withdrawn EP2226049A1 (en) | 2009-03-02 | 2009-03-02 | Motorized wheelchair with anti-tip wheels |
EP10708633.2A Not-in-force EP2403463B1 (en) | 2009-03-02 | 2010-03-02 | Motorized wheelchair with anti-tip wheels |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09154153A Withdrawn EP2226049A1 (en) | 2009-03-02 | 2009-03-02 | Motorized wheelchair with anti-tip wheels |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP2226049A1 (en) |
WO (1) | WO2010100605A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106901921B (en) * | 2017-04-25 | 2019-11-22 | 昆山奥仕达电动科技有限公司 | Detachable electric wheelchair |
JP6924680B2 (en) * | 2017-11-28 | 2021-08-25 | 本田技研工業株式会社 | Electric wheelchair |
GB2590895A (en) * | 2019-11-27 | 2021-07-14 | Porter Patricia | A device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007014680B4 (en) * | 2007-03-27 | 2009-06-18 | Pihsiang Machinery Manufacturing Co., Ltd., Sinfong | Folding, electric wheelchair |
-
2009
- 2009-03-02 EP EP09154153A patent/EP2226049A1/en not_active Withdrawn
-
2010
- 2010-03-02 EP EP10708633.2A patent/EP2403463B1/en not_active Not-in-force
- 2010-03-02 WO PCT/IB2010/050895 patent/WO2010100605A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP2403463A1 (en) | 2012-01-11 |
EP2226049A1 (en) | 2010-09-08 |
WO2010100605A1 (en) | 2010-09-10 |
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