Patent ID: 7641276

Claim:
A frame structure for a foldable chair comprising: an front interconnecting supporting unit having a front leg unit, a crisscrossed supporting unit installed thereon, wherein each of said front leg unit is composed of a upper portion of said front leg unit, a lower portion of said front leg unit, a front base cap, receiving joint and a front gliding sleeve; a rear interconnecting supporting unit being installed with a rear leg unit, an arc-shaped supporting unit, wherein each of said rear leg unit is installed with a rear base cap, a first rear gliding sleeve, a second rear gliding sleeve, a rod-bracket track, and a rear leg rod; wherein said front leg unit and said rear leg unit are parallel to each other and perpendicular to the ground where it is allowed to be folded and extended longitudinally; a lateral interconnecting supporting unit being composed of two board members pivotally connected with each other between said front leg unit and said rear leg unit; a transverse supporting rod having a connecting plate, a rod and a connecting joint installed thereon; a seat supporting unit and an armrest unit being installed between said front and rear leg unit respectively, wherein said seat supporting unit is provided for a seat unit to engage through; wherein said seat supporting unit is composed of a curved front portion and straight rear portion engaged with said second rear gliding sleeve positioned on said rear leg unit; wherein each of said receiving joint of said front leg unit is suitably engaged with the front portion of said seat supporting unit allowing said seat supporting unit being positioned between said front leg unit and said rear leg unit; beneath said armrest unit, a connecting member protruding there from and a gliding rod extending along the bottom of said armrest unit which can be pivotally engaged with said receiving joint of said front leg and sliding through said rod-bracket track respectively allowing said armrest unit being positioned on the top of said seat supporting unit.