US 6,981,742 B1
Cushion for backrest of chair
Jin-Long Hsiao, Taichung (Taiwan)
Assigned to Chen Hsing Enterprise Co., Ltd., Zhuchi Hsiang (Taiwan)
Filed on Jun. 19, 2004, as Appl. No. 10/871,779.
Int. Cl. A47C 3/025 (2006.01); A47C 3/00 (2006.01); A47C 7/02 (2006.01)
U.S. Cl. 297—284.4 8 Claims
OG exemplary drawing
 
1. A cushion, comprising:
a flexible curved main body having a first end formed with a fixed portion and a second end formed with a movable portion; and
an elastic mechanism mounted on the main body and biased between the fixed portion and the movable portion of the main body; wherein
the elastic mechanism includes a tensile spring having a first end secured on the fixed portion of the main body and a second end secured on the movable portion of the main body;
the fixed portion of the main body is formed with a support plate mounted on the first end of the tensile spring of the elastic mechanism;
the support plate of the fixed portion has a distal end formed with a planar support face to support the first end of the tensile spring of the elastic mechanism;
the support face of the support plate is formed with a through hole, the first end of the tensile spring is provided with a threaded rod extended through the through hole of the support face, and the elastic mechanism further includes a nut screwed onto the threaded rod of the first end of the tensile spring and rested on a side of the support face of the support plate.