Wheelchair having adjustable backrest

An attachment for the base frame of a wheelchair comprising:

• a seat frame having a front end and a rear end;
• a back assembly having a top end and a bottom end;
• means pivotally connecting the bottom end of said back assembly to said seat frame adjacent its rear end;
• said back assembly having a front panel and a rear panel, said rear panel being fixedly attached to said back assembly, said rear panel having a longitudinal axis;
• means for permitting reciprocal movement of the front panel of said back assembly along an axis parallel to the longitudinal axis of said rear panel comprising at least one slotted bearing block track and a rail member that matingly slides in said slotted bearing track, said slotted bearing block track being attached to the rear surface of said front panel and said rail member being attached to the front surface of said rear panel;
• and
• means for forcing reciprocal movement of said front panel of said back assembly with respect to said rear panel comprising a bracket attached to the rear surface of said front panel, a coupling member pinned to said bracket, a driven rod member having its one end connected to said coupling and its other end connected to one end of a flexible wire push pull cable, the opposite end of said wire cable being connected to a driven rod member whereby said axial travel of said driver rod member produces the identical amount of axial travel on said driven rod member which in turn produces longitudinal travel of said front panel.