Patent ID: 6938911

Claim:
A folding wheelchair comprising: two side frame units arranged in parallel at two sides, said side frame units each comprising a first four-bar linkage, a second four-bar linkage arranged at different elevations, a first guide rod, a second guide rod, and a pivot pin, said first four-bar linkage and said second four-bar linkage each comprised of a first horizontal bar, a second horizontal bar, a first vertical bar, and a second vertical bar, said first four-bar linkage and said second four-bar linkage having the same second horizontal bar, which has a longitudinal sliding slot, said first guide rod having a first end pivoted to the first horizontal bar of said first four-bar linkage and a second end, said second guide rod having a first end pivoted to the first horizontal bar of said second four-bar linkage and a second end, said pivot pin being inserted through the longitudinal sliding slot of the common second horizontal bar of said first four-bar linkage and said second four-bar linkage and pivotally connected between the second end of said first guide rod and the second end of said second guide rod, the second vertical bar of said first four-bar linkage extending upwards over a top side of the respective first horizontal bar; a first folding bar and a second folding bar respectively pivotally connected between front and rear ends of the first horizontal bar of the second four-bar linkages of said two side frame units; a third folding bar connected between the first vertical bars of the second four-bar linkages of said two side frame units on the middle; a fourth folding bar connected between the second vertical bars of the first four-bar linkages of said two side frame units; a stretcher connected between said first folding bar and said second folding bar; a fabric back panel connected between the second vertical bars of the first four-bar linkages of said two side frame units; a fabric seat panel connected between the first horizontal bars of the first four-bar linkages of said two side frame units; and four wheels respectively provided at front and rear ends of the first horizontal bars of the second four-bar linkages of said two side frame units.