Portable folding chair

摘要

A folding chair having cylindrical devices for supporting the back-support part of the chair. The folding chair comprises a seat-base part having a seat cloth and two loop-shaped frames pivotedly connected to each other and two joint members each having two extended arms for hingedly connecting the back-support part to the seat-base part. The back-support part includes a back cloth and two supporting tubes. A cylindrical device having a concave surface with two slightly protruded edges on one end is plugged and locked into the bottom opening of each of said supporting tubes. The supporting tubes sit firmly on the upper sections of the frames of the seat-base part by means of matched surface curvature when the back-support part is hingedly opened.