Patent ID: 7887138

Claim:
An integrally formed base arrangement of an office chair integrally made by plastic material, comprising: a) a middle axle seat having a conic axle hole in a longitudinal direction; b) a first U-shaped seat perpendicular to the middle axle seat, the first U-shaped seat having an opening directed aback, the first U-shaped seat being provided with longitudinal grooves at both internal walls thereof, a locating portion being formed at a bottom of the longitudinal grooves; c) a claw member having a plurality of arched supporting arms extending in angularly spaced manner from an external rim of the middle axle seat upward; d) a base frame disposed at a top of the supporting arms of the claw member, an annular groove being positioned at a surface of the base frame; e) two second U-shaped seats symmetrically formed at both sides of a bottom of the base frame with openings directed aback and positioned parallel to the first U-shaped seat, each of the second U-shaped seats having a through hole extended laterally therein; and f) two hand rest supports extended from both sides of the base frame and the claw member outward, thereby creating a connection surface directed upward at an external end thereof.