| 主权项 |
1. A chair comprising:
a seat/back assembly which includes a cushion assembly for supporting one of a seat and back of a chair occupant, said cushion assembly including a cushion, a cover and an attachment structure for securing said cover in overlying covering relation to said cushion; said cushion assembly further comprising a horizontally enlarged, inner shell which has a bottom surface and an upper surface which is covered with said cushion, said cushion being resiliently-compressible, and extending outwardly to an outer peripheral shell edge of the inner shell, said cushion being enclosed by said cover which said cover is enlarged widthwise and in the front-to-back direction so as to hang over the sides of the cushion and wrap about the outer peripheral shell edge of the inner shell, wherein a peripheral cover edge of the cover is able to wrap about and extend partially underneath the bottom surface of the inner shell, said inner shell in the edge region of the outer peripheral shell edge including an edgewise-extending securement channel defined by parallel, downwardly-projecting inner and outer channel walls, wherein said inner channel wall includes spaced-apart first teeth for securing said cover; said cushion assembly further including an outer shell which mounts to the inner shell from the bottom surface thereof and extends along the outer peripheral shell edge, said outer shell including said attachment structure thereon which comprises an upstanding rib that extends edgewise about an outer periphery of the outer shell, a free end of said rib including spaced-apart second teeth so that when said outer shell is fitted onto the inner shell, the peripheral cover edge follows a convoluted path by wrapping about the outer peripheral shell edge of the inner shell and overlapping the bottom surface of the inner shell, and then turning into the securement channel as it wraps over the free end of the rib, and then turns downwardly out of the securement channel and finally extends over and terminates beyond the inner channel wall and the first teeth thereof; and wherein said cover is pinched at first and second pinch points as said cover passes cross-wise through said convoluted path, wherein said second pinch point is located between the second teeth at the upper end of the rib and the opposing bottom surface of the securement channel, and said first pinch point is located at the first teeth on the inner channel wall which presses the cover against an opposing inside surface of the outer shell. |
