Patent ID: 6981742

Claim:
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.