Adjustable therapeutic exerciser for lower human extremities

A mechanism for actively and passively exercising the lower extremities of a person, comprising in combination:

• a base having a first means for attaching a primary support structure and for adjustable positioning in at least one plane relative to said primary support structure;
• a housing carried spacedly above the base by articulating linkage providing a second means for adjusting motion of the housing in three perpendicular directions relative to the base;
• a compound pedal crank journaled in the housing and extending laterally on both sides thereof, said pedal crank having a first medial shaft portion, a pair of second lateral shaft portions, wherein one end of each second lateral shaft portion extends perpendicularly at each end of the first medial shaft portion, and a pair of third pedal shaft portions, wherein one end of each third pedal shaft portion extends perpendicularly and outwardly from the other end of the second lateral shaft portion and parallel to the first medial shaft portion, each of said second lateral shaft portions and third pedal shaft portions being adjustably positionable for motion in two perpendicular directions relative to the compound pedal crank;
• a pair of pedal structures, wherein each of said pedal structures is carried by each of the third pedal shaft portions for rotary motion relative thereto, each of said pedal structures having a pedal adjustment means for selectively determining a pedal angle in three perpendicular planes relatively to the third pedal shaft portion supporting it;
• and
• pedal crank motion regulating mechanism including means of rotating the first medial shaft portion and brake means for adjustably limiting the rotary motion of the third pedal shaft portions.