US Patent 6857166 Cushion

A cushion body of a rubber-like elastic element having cushioning function in which engagement holes including a cave and a pit are formed. The cave is formed so that a horizontal head of a T-shaped clip is inserted into a space provided at the side of a bottom surface portion. The pit is formed so as to extend in a direction perpendicular to the cave, and to be opened in the bottom surface portion, permitting a vertical shaft of the clip to be inserted thereinto. The clip is formed with a plastic material and T-shaped and has a plurality of engaging claws flared toward the root portion from an end part of the vertical shaft of the T-shaped portion. The clip is engaged with the engagement holes of the cushion body.