| 摘要 |
A foldable wheel chair or mobility base is disclosed that comprises a chair portion and a wheeled frame. The chair portion has a back hinged to a seat. The frame supports the chair portion, a spaced pair of front wheel caster assemblies and a spaced pair of rear wheels. A lower end of the back of the chair portion attaches to the frame via two spaced brackets which are slidably connected to upright curved rear support members such that they can be moved along the curved rear support members to permit adjustment of the chair tilt between predetermined stop positions along the curved rear support members without changing a seat to back angle. The chair portion is connected to the frame via front support members and diagonal struts connected to common pins fastened to each of the front wheel caster assemblies. The other end of each diagonal strut is hinged to one of the spaced brackets. The chair preferably provides a different distance between front and rear wheels at different seat to back angles and tilt positions of the chair portion. Further, the configuration permits virtually independent adjustment of chair portion tilt, seat to back angles and permits a separate dynamic movement of the seat to back angle to facilitate therapeutic exercise capability for a chair occupant.
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