Abstract
The present invention relates to an indoor and outdoor mobility system 1 forming a mobility device 10 for people with walking disability, the system comprising a base 20 two indoor front wheels 30, which can be attached to the base 20; two outdoor front wheels 40, which can be removably attached to the base 20, wherein the outdoor front wheels 40, when attached to the base 20 comprise a wider track width compared to the indoor wheels 30; indoor back wheels 52 which can be attached to the base 20; and outdoor back wheels 62 which can be removably attached to the base 20, wherein the outdoor back wheels 62, when attached to the base 20 comprise a wider track width compared to the indoor back wheels 30. The invention further comprises a method for the change of a mobility device for people with walking disability from an indoor to an outdoor use.
Claims
1. Indoor and outdoor mobility system forming a mobility device for people with walking disability, the system comprising: a. a base b. two indoor front wheels, which can be attached to the base; c. two outdoor front wheels, which can be removably attached to the base, wherein the outdoor front wheels, when attached to the base comprise a wider track width compared to the indoor front wheels; d. indoor back wheels, which can be attached to the base; and e. outdoor back wheels which can be removably attached to the base, wherein the outdoor back wheels, when attached to the base comprise a wider track width compared to the indoor back wheels.
2. Indoor and outdoor mobility system according to claim 1, wherein the outdoor front wheels and the outdoor back wheels comprise a longer wheel base compared to the indoor front wheels and indoor back wheels.
3. Indoor and outdoor mobility system according to claim 1, wherein the outdoor front wheels are attached to the base via simultaneously attached indoor front wheels.
4. Indoor and outdoor mobility system according to claim 3, wherein the outdoor front wheels are attached to the indoor front wheels by a quick release mechanism, which can be operated without the use of tools.
5. Indoor and outdoor mobility system according to claim 1, wherein the outdoor front wheels are attached to the base when the indoor front wheels are removed from the base.
6. Indoor and outdoor mobility system according to claim 1, wherein the indoor front wheels and indoor back wheels are solid tires and the outdoor front wheels and outdoor back wheels are pneumatic tires.
7. Indoor and outdoor mobility system according to claim 1, wherein the outdoor front wheels have a larger diameter than the indoor front wheels and/or wherein the outdoor back wheels have a larger diameter than the indoor tail wheels.
8. Indoor and outdoor mobility system according to claim 1, wherein when the outdoor front wheels and the outdoor back wheels are used, the ground clearance of the mobility device is larger than when indoor front wheels and indoor back wheels are used.
9. Indoor and outdoor mobility system according to claim 1, further comprising individually and electrically driven front axles for driving the indoor and outdoor front wheels.
10. Indoor and outdoor mobility system according to claim 1, further comprising: f. an indoor front or back tail element, removably attached to the base, wherein the indoor tail element supports the indoor back wheels or the indoor front wheels; and g. an outdoor front or back tail element, removably attached to the base, wherein the outdoor tail element supports the outdoor back wheels or outdoor front wheels.
11. Indoor and outdoor mobility system according to claim 10, wherein the outdoor tail element comprises a longer effective length than the indoor tail element.
12. Indoor and outdoor mobility system according to claim 1, further comprising a lifting device for lifting the wheels from the ground.
13. Method for the change of a mobility device for people with walking disability from an indoor to an outdoor use, the method comprising the following steps: a. attaching outdoor front wheels to the mobility device, wherein the outdoor front wheels, when attached to the mobility device comprise a wider track width compared to indoor front wheels; b. attaching outdoor back wheels to the mobility device, wherein the outdoor back wheels, when attached to the base comprise a wider track width compared to indoor back wheels.
14. Method for the change of a mobility device according to claim 13 further comprising the steps of: c. removing an indoor front or back tail element from a base of the mobility device, wherein the indoor tail element supports the indoor back wheels; and d. attaching an outdoor front or back tail element to the base, wherein the outdoor tail element supports the outdoor back wheels.
15. Method for the change of a mobility device according to claim 13, further comprising the step of: e. lifting the mobility device by means of a lifting device such that the wheels are lifted from the ground.
Description
4. SHORT DESCRIPTION OF THE DRAWINGS
[0048] In the following further preferred embodiments of the invention are described with respect to the drawings in which shows:
[0049] FIG. 1A a three-dimensional side view of an embodiment of a mobility device in indoor configuration;
[0050] FIG. 1B a three-dimensional side view of the mobility device of FIG. 1A in outdoor configuration;
[0051] FIG. 2A and 2B a three-dimensional view of an embodiment of an indoor tail element;
[0052] FIG. 2C and 2D a three-dimensional view of an embodiment of an outdoor tail element;
[0053] FIG. 3A to 3D three-dimensional side views of an embodiment of a mobility device showing the sequence of changing an indoor tail element to an outdoor tail element;
[0054] FIG. 4 a three-dimensional rear view of an embodiment of a mobility device with removed tail element showing the attachment point for the tail element;
[0055] FIG. 5 a three-dimensional rear view of an embodiment of a mobility device with an indoor tail element in the process of attachment;
[0056] FIG. 6A to 6C three-dimensional partial side views of an embodiment of a mobility device showing the sequence of attaching an outdoor front wheel to an indoor front wheel;
[0057] FIG. 7 a three-dimensional partial side view of the mobility device of FIG. 1 and an embodiment of a lifting device;
[0058] FIG. 8A and 8B a three-dimensional partial side view of the mobility device and the lifting device of FIG. 7 in a sequence of lifting the mobility device; and
[0059] FIG. 9 a schematic view showing a comparison of the dimensions of embodiments of an indoor and an outdoor mobility device.
5. DESCRIPTION OF PREFERRED EMBODIMENTS
[0060] In the following preferred embodiments of the invention are described with respect to to the accompanying figures.
[0061] The indoor and outdoor mobility system can comprise a regular manual or electrically driven wheelchair (not shown) as mobility device. On such regular wheelchair the switch from indoor to outdoor use, and vice versa, can be done preferably by changing the caster front wheels from indoor front wheels with a smaller track width to outdoor front wheels with a larger track width, and adding a second pair of bigger outdoor back wheels onto the regular drive back wheels. The base is the frame of the wheelchair. In this way, the mobility device can perform best to its ability in both environments.
[0062] FIG. 1A and 18 show an embodiment of a mobility device to of the indoor and outdoor mobility system 1. The mobility device to is electrically driven and can be used by a user to drive around in a standing position. The mobility device comprises a rigid base 20 which preferably comprises electric motors, batteries and control electronics for individually driven front axles 22. The mobility device to further comprises a pivot arm 12, which has a pelvis support 16 for fixing a user's belly and control elements 18 at the top end. The pivot arm 12 is pivotably connected to the base 20 at a pivot joint 13, so that the pivot arm 12 can be pivoted to the back of the mobility device to. This allows the user to easily enter the mobility device to from the back side of the mobility device to and out of a seated position. Further, the user can adopt a seated position during use of the mobility device to for reaching positions that are arranged on a lower level. The mobility device to further comprises two footrests 17, that are arranged at the base 20 at a low level of the mobility device to. For stabilizing the user's tibia, the mobility device to further comprises a tibia support 14.
[0063] By means of such mobility device 10 the user preferably can on its own change from a seated to a standing position in which he can drive around freely. The control of the mobility device is preferably done by electronic control elements 18 like a joystick or a remote control.
[0064] FIG. 1A shows the mobility device 10 in an indoor configuration with two indoor front wheels 30 and an indoor tail element 50 attached. The indoor tail element 50 has two indoor back wheels 52, which are preferably caster wheels, at the end thereof. The shown indoor tail element 50 is a back tail element as it is attached to the back side of the mobility device 10. However, the mobility device 10 can generally also be configured (not shown) such that the indoor and outdoor tail elements 50, 60 are front tail elements and are attached to the front side of the mobility device 10. Then, the driven wheels would be the back wheels.
[0065] The indoor front wheels 30 and the indoor back wheels 52 are preferably solid tires, preferably solid rubber tires. Due to this comparably hard configuration of the indoor wheels 30, 52 stability of the mobility device 10 is improved during indoor use. This is particularly important since the mobility device 10 in indoor configuration comprises a very compact shape with a small footprint 2 of preferably only 42 cm75 cm as it can be seen in FIG. 9. Thus, also the maximum track width TWi of the indoor front wheels 30 is preferably 42 cm. Further, as the indoor tail element 30 is comparably short, the wheelbase WBi of the mobility devices 10 is short and the overall length is preferably about 75 cm, only.
[0066] FIG. 1B shows the mobility device 10 in an outdoor configuration with two outdoor front wheels 40 and an outdoor tail element 60 attached. The shown outdoor tail element 60 is a back tail element as it is attached to the back side of the mobility device 10. The outdoor tail element 60 has two outdoor back wheels 62, which are preferably caster wheels, at the end thereof. The outdoor front wheels 40 and the outdoor back wheels 62 are preferably soft rubber tires, preferably pneumatic tires. Due to this comparably soft configuration of the outdoor wheels 40, 62 the suspension behavior and traction of the mobility device 10 is improved during outdoor use. Further, the outdoor wheels 40, 62 have a significant larger outer diameter compared with the outer diameter of the indoor wheels 30, 52. This increases the ground clearance 4 of the mobility device. As it can be seen in FIG. 9, in indoor configuration the ground clearance 4 is preferably about 5 cm, whereas in outdoor configuration the ground clearance is preferably about 8.5 cm.
[0067] For improving the stability of the mobility device 10 during outdoor use the outdoor tail element 60 comprises a wider track width TW0 of its wheels 62 than the track width TWi of the indoor tail element 50, see FIGS. 2A and 2C. Likewise, the track width of the outdoor front wheels 40 is wider than the track width of the indoor front wheels 30. Preferably, the maximum track width of indoor wheels 30, 52 is about 42 cm, whereas the maximum track width of the outdoor wheels 40, 62 is about 60 cm. In addition, for further improving the stability of the mobility device 10 during outdoor use, the outdoor tail element 60 is longer than the indoor tail element 50, such that, when attached, the wheelbase WB0 of the mobility device 10 in outdoor configuration is significantly longer than the wheelbase WBi in indoor configuration (see FIG. 9).
[0068] FIGS. 2A and 2B show an indoor tail element 50 in more detail. The indoor tail element 50 comprises a rigid Y-shaped tail frame 56 at which the indoor caster back wheels 52 are supported. The indoor tail element 50 further comprises a quick release mechanism 54 by which the indoor tail element 50 can be secured to a receptacle 24, 26 of the base 20. The quick release mechanism 54 can comprise a screw, splint, cam, catch, or similar element, which can be operated without the use of tools. The indoor tail element 50 further comprises a support pipe 58 that fits into a receptacle tube 26 at the base 20, see FIGS. 4 and 5 for providing a stable connection of the indoor tail element 50 to the other parts of the mobility device 10.
[0069] Similarly, FIGS. 2C and 2D show an outdoor tail element 60 in more detail. The outdoor tail element 60 comprises a rigid Y-shaped tail frame 66 at which the outdoor caster back wheels 62 are supported. The outdoor tail element 60 further comprises a quick release mechanism 64 by which the outdoor tail element 60 can be secured to a receptacle 24, 26 of the base 20. The quick release mechanism 64 can comprise a screw, splint, cam, catch, or similar element, which can be operated without the use of tools. The outdoor tail element 60 further comprises a support pipe 68 that fits into a receptacle tube 26 at the base 20, see FIGS. 4 and 5 for providing a stable connection of the indoor tail element 50 to the other parts of the mobility device 10.
[0070] FIGS. 3A to 3D show a sequence of changing the tail elements 50, 60 of a mobility device form an indoor to an outdoor configuration. The change from an outdoor configuration to an indoor configuration is done in a correspondingly reverse manner. As shown in FIG. 3A the mobility device 10 is initially lifted by a lifting device 70 which attaches the base 20. This lifts the wheels 30, 40, 52, 62 from the ground. In this condition the quick release mechanism 54 can be manually operated to unlock the indoor tail element 50 from the base 20. If unlocked, the indoor tail element 50 can be pulled to the back and removed from the base 20 until it is separate, as it is shown in FIG. 3B. Then, as shown in FIG. 3C the outdoor tail element 60 can be attached by first inserting the support pipe 68 into the corresponding receptacle tube 26 at the base 20. This allows a good guidance for the further insertion of the outdoor tail element 60 at the base. In this condition, see also FIG. 5 for the indoor tail element 50, the outdoor tail element 60 can be pushed to the front of the mobility device 10 until it reaches a stop of the receptacle 24, 26. FIG. 3D shows the final position of the outdoor tail element 60 after insertion into the receptacle 24, 26. In this condition the quick release mechanism 64 can be manually operated or automatically engages for locking the outdoor tail element 60 securely to the base 20 of the mobility device 10.
[0071] Details of the receptacle 24, 25 at the base 20 can be seen in FIG. 4. In this embodiment the receptacle 24, 25 comprises the receptacle tube 26, which preferably extends horizontally to the front of the mobility device 10 and centrally within the base 20. Further, the receptacle 24, 25 comprises a fastening plate 24, which on the one hand provides a positive engagement with the tail frames 56, 66, for accepting forces of the tail elements 50, 60 and on the other hand acts as counter element for the quick release mechanisms 54, 64 for securing the tail elements 50, 60 to the base 20. The fastening plate 24 is preferably plate shaped and extends in longitudinal direction of the mobility device 10 to the back of the mobility device. The fastening plate 24 is preferably arranged at the base above the receptacle tube 26. FIG. 5 shows further details of the receptacle 24 and a quick release mechanism 54 of an indoor tail element 50. In FIG. 5 the indoor tail element 50 is partially connected, wherein the support pipe 58 is partially inserted into the receptacle tube 26.
[0072] FIGS. 6A to 6C show a sequence of changing from indoor front wheels 30 to outdoor front wheels 40, when the mobility device 10 is lifted by a lifting device 70. In this embodiment the outdoor front wheels 40 are connected to the front axles 22 indirectly via the indoor front wheels 30, which remain attached to the front axles 22. For a 2 secure and centered connection, the indoor front wheels 30 comprise an annular groove 32 in the rim into which an annular extension 44 of the rim of the outdoor front wheels 40 can be inserted, when the wheels are attached to each other. For transmission of driving moments the indoor front wheels 30 comprise preferably four bore holes 34 into which four corresponding pins 46 of the rim of the outdoor front wheels 40 can engage. When the outdoor front wheel 40 is attached to the corresponding indoor front wheel 30, as shown in FIG. 6B, a quick release mechanism 42 can be manually actuated for securing the outdoor front wheel 40 at the indoor front wheel 30. Preferably the quick release mechanism 42 can be operated without the use of tools. Preferably, the quick release mechanism 42 comprises a screw that can be rotated manually for locking the outdoor front wheel 40 to the indoor front wheel.
[0073] FIG. 7 shows an embodiment of a lifting device 70 for lifting a mobility device 10 in order to change from indoor configuration to outdoor configuration or vice versa. The lifting device comprises an upper platform 72 that can be raised and lowered in parallel to the floor. This allows that the user can remain on the mobility device 10 during configuration change. The platform 72 is connected to a floor support 78 via a parallel linkage 76. The parallel linkage is manually pivotable via an actuation bar 74 for lifting the platform 72. The lifting device 70 further comprises rolls 79 such that it can be easily placed below the base 20 and in-between the front wheels 30, 40. FIGS. 8A and 8B show the process of lifting the mobility device 10 by means of the lifting device 70. Thereby, the actuation bar 74 is moved from an essentially vertical position of FIG. 8A to an essentially horizontal position of FIG. 8B. During this movement the parallel linkage 76 attached to the actuation bar 74 moves from an essentials horizontal position to a vertical position and beyond this vertical position into a slightly inclined vertical position. In this slightly inclined vertical position of the parallel linkage 76 the upper platform 72 remains stable in lifted position such that the configuration change can be performed safely.
[0074] The indoor and outdoor mobility system 1 of this preferred embodiment comprises the mobility device 10, two indoor front wheels 30, two outdoor front wheels 40, an indoor tail element 40, an outdoor tail element 50 and preferably a lifting device 70. However, the indoor and outdoor mobility system 1 may further comprise further front wheels and further tail elements for other special applications and uses.
[0075] The indoor and outdoor mobility system 1 described above allows for an easy and fast change of a single mobility device 10 from an indoor to an outdoor use. Preferably, the indoor and outdoor mobility system 1 in outdoor configuration increases the ground clearance make the mobility device wider and longer and all four indoor wheels are changed to softer outdoor wheels that have bigger dimensions. This allows the essentially same mobility device to be able to drive over higher curbs, climb to higher ramps in outdoor configuration while the user feels comfortable on uneven ground. Further, the switch can be preferably done by the user when he is out of the device, or by a helper when the user is still on the device.
LIST OF REFERENCE SIGNS
[0076] 1 indoor and outdoor mobility system
[0077] 2 footprint of indoor mobility device
[0078] 3 footprint of outdoor mobility device
[0079] 4 ground clearance
[0080] 10 mobility device
[0081] 12 pivot arm
[0082] 13 pivot joint
[0083] 14 tibia support
[0084] 16 pelvis support
[0085] 17 foot rests
[0086] 18 control elements
[0087] 20 base
[0088] 22 front axles
[0089] 24 fastening plate of receptacle
[0090] 26 receptacle tube
[0091] 30 indoor front wheels
[0092] 32 annular groove
[0093] 34 bore holes
[0094] 40 outdoor front wheels
[0095] 42 quick release mechanism
[0096] 44 annular extension
[0097] 46 pins
[0098] 50 indoor tail element
[0099] 52 indoor back wheels
[0100] 54 quick release mechanism
[0101] 56 indoor tail frame
[0102] 58 support pipe
[0103] 60 indoor tail element
[0104] 62 indoor back wheels
[0105] 64 quick release mechanism
[0106] 66 indoor tail frame
[0107] 68 support pipe
[0108] 70 lifting device
[0109] 72 upper platform
[0110] 74 actuation bar
[0111] 76 parallel linkage
[0112] 78 floor support
[0113] 79 rolls
