Patent ID: 7988171

Claim:
A bi-folding wheelchair comprising: (a) a left side wheel frame assembly and a right side wheel frame assembly, each supporting a wheel assembly, interconnected by a plurality of pivot arms and actuating arms, and having spanning there between a seat portion and a backrest portion; (b) one or more locking arms foldably extending between said right frame member and said left frame member enabling said bi-folding wheelchair to lock securely in the open position for use, and unlock to be folded; (c) a front over center locking mechanism further comprising a right side looking arm, a left side locking arm, a hand knob and a stop pin; (d) a back over center locking mechanism further comprising a right side locking arm, a left side locking arm, a hand knob and a stop pin; (e) one or more backrest locking assemblies integral to said left and right wheel frame assemblies enabling said backrest portion of said bi-folding wheelchair to lock securely in the open position for use, and unlock to be folded; and further wherein said backrest locking assemblies comprise right and left locking plates having upright locking orifices and collapsed locking orifices integrated therein, and release rings enabling manual locking and unlocking of the backrest locking assemblies; whereby when in the open position for use said bi-folding wheelchair is secure from accidental collapse and when in the folded position is compressed into a compact space-saving, readily lifted and transportable configuration.