Patent ID: 6889993

Claim:
A wheelchair comprising a seat frame having two transverse support rods, a sunk-type seat module mounted on the seat frame and located between the two transverse support rods, a backrest frame having two upright support rods, and a sunk-type backrest module mounted on the backrest frame and located between the two upright support rods, the sunk-type seat module including a rigid seat plate having four corners each provided with a combination body and a mating positioning body, the combination body of the seat module having a first section formed with a slotted fixing portion secured on a bottom of a respective one of the four corners of the seat plate of the seat module and a second section formed with a combination portion, the combination portion being formed with a plurality of first adjusting holes, the positioning body of the seat module having a flat section formed with a combination portion secured to the combination portion of the combination body of the seat module, the combination portion of the positioning body of the seat module being formed with a plurality of second adjusting holes, at least one second adjusting hole being selectively aligned with one of the first adjusting holes of the combination portion of the combination body of the seat module, the combination portion of the positioning body of the seat module having a distal end formed with a hook-shaped positioning portion for hooking on the transverse support rod of the seat frame.