Foldable support frame and foldable chair using same

A foldable support frame, comprising a first rear support block, a second rear support block, a second front support block, a first front support block, a first rotating assembly, and a second rotating assembly, wherein two ends of a first side rod are connected to the first rear support block and the first front support block respectively, and two ends of a second side rod are connected to the second rear support block and the second front support block respectively;

• two ends of a first front rod are connected to the first front support block and the first rotating assembly respectively, and two ends of a second front rod are connected to the second front support block and the second rotating assembly respectively;
• the first rotating assembly is connected to the second rotating assembly, and the first rear support block and the second rear support block are connected to different support rods, are pivotally coupled to each other via a hinge structure to define a common hinge axis;
• such that the first side rod and the second side rod are configured to rotate relative to each other about the common hinge axis during folding and unfolding of the support frame.