The present invention is directed to a tilt-in-space wheelchair that limits the shift of the center of a gravity of a wheelchair occupant during tilting. The wheelchair comprises a main frame adapted to be supported on a surface by wheels, a seat frame for supporting a occupant, and an arc plate for
The present invention is directed to a tilt-in-space wheelchair that limits the shift of the center of a gravity of a wheelchair occupant during tilting. The wheelchair comprises a main frame adapted to be supported on a surface by wheels, a seat frame for supporting a occupant, and an arc plate for slidably or rollably supporting the seat frame with respect to the main frame. The arc plate defines a first track and a second track that guide the tilting of the seat frame relative to the frame. The first track and second track may have non-constant curvatures. Further, the first track and second track may be arranged non-concentrically on the arc plate and may have different lengths.
대표청구항▼
1. A wheelchair comprising: a main frame;a plurality of wheels adapted to support the main frame relative to a supporting surface;a seat frame configured to support an occupant; andan arc plate attached to the seat frame, the arc plate having a first curved guide and a second curved guide positioned
1. A wheelchair comprising: a main frame;a plurality of wheels adapted to support the main frame relative to a supporting surface;a seat frame configured to support an occupant; andan arc plate attached to the seat frame, the arc plate having a first curved guide and a second curved guide positioned above a substantial portion of the first curved guide, the first and second curved guides configured to serve as rolling or sliding surfaces that allow the seat frame to tilt relative to the main frame, wherein the first and second curved guides each have a curvature that is non-concentric with respect to each other, such that, the first and second curved guides define a tilt path that limits shifting of the center of gravity of the occupant when the occupant is supported by the seat frame and the seat frame is tilted relative to the main frame along the tilt path. 2. The wheelchair of claim 1 further comprising: a support plate attached to the main frame, the support plate comprising a first roller or slider spaced apart from a second roller or slider, the first roller or slider engaged with the first curved guide and the second roller or slider engaged with the second curved guide. 3. The wheelchair of claim 2, wherein the main frame is elongate along an axis, and further includes a rear end and a forward end spaced from the rear end along the axis in a forward direction, wherein one of the plurality of wheels is a caster wheel attached to the main frame such that an axle of the castor wheel is spaced from a position where the support plate is attached to the main frame along the forward direction. 4. The wheelchair of claim 3, further comprising an axle plate configured to secure to the wheelchair one wheel of the plurality of wheels, and the axle plate is attached to the main frame at a position, wherein the support plate is attached to the main frame between the axle plate and the caster wheel. 5. The wheelchair of claim 1 further comprising: an axle plate configured to mount one of the plurality of wheels to the wheelchair, the axle plate having a plurality of holes that are adapted to align with a plurality of holes defined by the main frame, the axle plate being attachable to the main frame at a plurality of different locations along the main frame. 6. The wheelchair of claim 5, wherein another of the plurality of wheels is a caster wheel attached to the main frame at a position that is spaced apart from each of the plurality of different locations in a forward direction. 7. The wheelchair of claim 5, wherein a portion of the arc plate is disposed rearward of the axle plate when the axle plate is attached to the main frame at any one of the plurality of different locations along the main frame. 8. The wheelchair of claim 1, wherein the first curved guide and second curved guide each have a constant curvature. 9. The wheelchair of claim 8, wherein the constant curvature of the first curved guide is different from the constant curvature of the second curved guide. 10. The wheelchair of claim 1 further comprising: a support plate attached to the main frame; andtwo rollers disposed on the support plate, one of the two rollers engaged with one of the first and second curved guides, and the other of the two rollers engaged the other of the first and second curved guides. 11. The wheelchair of claim 1, wherein the arc plate is moveably coupled to the main frame and is attached to the seat frame. 12. The wheelchair of claim 1, wherein the seat frame includes a base component and a back component, and the base component extends along a plane, wherein a portion of the arc plate intersects the plane. 13. The wheelchair of claim 1, wherein the first and second curved guides curve with respect to and toward respective first and second points that are located above the main frame. 14. The wheelchair of claim 1, wherein the first curved guide and second curved guide have a curvature comprising two radii of curvature. 15. The wheelchair of claim 1, wherein the first curved guide and second curved guide comprise respective first and second tracks. 16. A wheelchair comprising: a main frame;a plurality of wheels configured to support the main frame relative to a support surface;a seat frame configured to support an occupant;an arc plate attached to the seat frame, the arc plate having a first curved guide and a second curved guide positioned above a substantial portion of the first curved guide along a vertical direction with respect to the support surface, the first and second curved guides configured to serve as rolling or sliding surfaces that allow the seat frame to tilt relative to the main frame, wherein the first and second curved guides each have a curvature that is non-concentric with respect to each other, such that, the first and second curved guides define a tilt path of the arc plate that limits shifting of the center of gravity of the occupant when the occupant is supported by the seat frame and the seat frame is tilted relative to the main frame along the tilt path;a support plate attached to the main frame, the support plate comprising a first roller or slider spaced apart from a second roller or slider, such that the first roller or slider is engaged with the first curved guide and the second roller or slider is engage with the second curved guide; andan axle plate configured to mount one of the plurality of wheels to the wheelchair, the axle plate having a plurality of holes that are configured to align with a plurality of holes on the main frame, such that, the axle plate is attachable to the main frame at a plurality of different locations along the main frame. 17. The wheelchair of claim 16, wherein one of the plurality of wheels is a caster wheel attached to the main frame such that an axle of the castor wheel is spaced apart from a position where the support plate is attached to the main frame along a forward direction. 18. The wheelchair of claim 16, wherein the support plate is attached to the main frame at a position that is 1) spaced apart from each of the plurality of different locations along the main frame in a forward direction, and 2) spaced apart from the caster wheel axle along a rearward direction that is opposite to the forward direction. 19. The wheelchair of claim 16, wherein the arc plate is disposed between the seat frame and an axle attached to the axle plate when the axle plate is attached to the main frame at any one of the plurality of different locations along the main frame. 20. The wheelchair of claim 16, wherein the arc plate is attached to the seat frame at two points along the seat frame. 21. The wheelchair of claim 16, wherein a portion of the arc plate is disposed rearward of the axle plate when the axle plate is attached to the main frame at any one of the plurality of different locations along the main frame. 22. The wheelchair of claim 16, wherein the first curved guide and second curved guide each have a constant curvature. 23. The wheelchair of claim 16, wherein the first and second curved guides curve with respect to and toward respective first and second points that are located above the main frame. 24. The wheelchair of claim 16, wherein the arc plate is moveably coupled to the main frame and attached to the seat frame by the support plate. 25. The wheelchair of claim 16, wherein the first curved guide and second curved guide have a curvature comprising two radii of curvature. 26. The wheelchair of claim 16, wherein the first curved guide and second curved guide comprise respective first and second tracks. 27. The wheelchair of claim 19, wherein the first roller or slider is spaced apart from the second roller or slider along a vertical direction that extends away from the support surface, and a horizontal direction that is perpendicular to the vertical direction.
Kramer, Kenneth L.; Dahneke, Marshall S.; Wilcox, Reed N.; Schwanemann, David T.; Biondo, John P.; Ganance, Francis C.; Schultz, Scott A.; Hardy, Russell L.; Acton, Troy D., Chair.
Schmitz,Johann Burkhard; Plikat,Claudia; Neubert,Nicolai; Zwick,Carola E. M.; Zwick,Roland R. O.; Aldrich,John F.; Hill,Christopher C.; Slagh,James D.; VanDeRiet,Douglas M., Tilt chair and methods for the use thereof.
Degonda Andre,CHX ; Wuthrich Thomas,CHX, Wheelchair for transporting or assisting the displacement of at least one user, particularly for handicapped person.
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