Patent ID: 6926356

Claim:
A portable folding chair, comprising: a chair support frame, a surface fabric, a backrest, arms, and shoes, wherein said chair support frame includes seating frame tubes, back-rest tubes, arm front support tubes, front support legs, front cross tubes, rear support legs, connection sliding blocks, locking sliding blocks, arm sliding blocks, rear cross tubes, locking fixtures, fixing elements, sliding locating blocks, rotating support blocks, and U-shaped hinging pieces, said rear support legs are connected to said front support legs via said rotating support blocks, each of said seating frame tubes and each of said back-rest tubes are connected to one of said rear support legs via one of said connection sliding blocks and can slide freely along said rear support legs, a middle portion of each of said seating frame tubes is connected to a middle portion of one of said front support legs, an upper end of each of said front cross tubes is connected to one of said fixing elements of each of said seating frame tubes via one of said U-shaped hinging pieces, and a lower end of each of said front cross tubes is connected to one of said locking fixtures on one of said front support legs via one of said U-shaped hinging pieces, an upper end of each of said rear cross tubes is fixed to one of said sliding locating blocks on one of said back-rest tubes via one of said U-shaped hinging pieces, and a lower end of each of said rear cross tubes is connected to one of said rear support legs via one of said U-shaped hinging pieces, a lower end of each of said arm front support tubes is connected to one of said locking sliding blocks sleeved on one of said front support legs, a middle portion of each of said arm front support tubes is connected to one of said fixing elements, and a front end of each of said arms is connected to an upper end of one of said arm front support tubes, and a rear end of each of said arms is connected to an upper portion of one of said front support legs via one of said arm sliding blocks slidably mounted in a sliding groove located under each of said arms.