| 摘要 |
<p>A seat-back unit for a chair utilizes pre-flexed sheets of sinuous spring wire material (29) connected to relatively rigid side support members which afford flexibility, but provide a frame for the unit. The two L-shaped side support members (26) are held apart by a rigid cross stretcher member (28) positioned in the seat portion, near the back. The seatback unit is connected to a chair frame at only four points in a "cradling" arrangement, by means of a pair of hooks (33) extending back from the tops of the relatively rigid members, received in slots (34) of the chair frame, and by bolted connections (36, 60) of the relatively rigid members at the front of the seat portion to the chair frame. The seat-back unit, and particularly the relatively rigid frame members, are put into a pre-stressed condition as the seat portion is connected to the chair frame. Covering material, which may be removable, is positioned over the seat-back unit. A simple chair frame structure is preferably used, with an X-shaped bracing configuration at the bottom and four upright legs. This may be accomplished with two tubular members, each formed into a front and a rear leg, and an angled portion of a brace, with the portions connected together centrally. </p> |
