Patent ID: 7104604
Filing Date: 2006-09-12
Classification: A47C

Abstract:
1. Waist supporting structure of a dual-layer chair back, comprising a waist support sandwiched between a board-shaped part and a frame of a mesh member of a dual-layer chair back; the board-shaped part of the dual-layer chair back having a plurality of guide grooves on a front side thereof; the mesh member of the dual-layer chair back including the frame, and a mesh secured over a space encompassed by the frame; the mesh member being positioned right in front of the board-shaped part with a plurality of sleeves being sandwiched between the board-shaped part and the frame thereof; a plurality of threaded connecting elements being passed through the board-shaped part, the sleeves, and the frame of the mesh member to secure the mesh member to the board-shaped part; the waist support being sandwiched between the mesh member and the board-shaped part with such a tightness as to be adjustable in position; the waist support having a plurality of guide protrusions on a rear side, which are fitted in the guide grooves; the waist support having two grip portions extending from two ends thereof and sticking out from two lateral edges of the chair back.