| 摘要 |
Chairs and other seating units are made with seats and, where present, backs, each comprising a plurality of sinuous spring wires secured to rigid frame members of the seating units, these rigid frame members being themselves held apart by one or more other rigid frame members. The sinuous spring wires are in their natural state shaped in circular or cylindrical arcs which are partially but not completely flattened in the completed seats and backs, to place the springs in tension and to aid in their retention by the frame. The spring wires touch or come quite close to each other at least once per cycle, and a thin sleevelike plastic coating surrounds the wires and follows their sinuous shape. It also surrounds the rigid frame members to which they are secured and links the wires and frame together and links the wires to each other wherever they touch, to provide a unitary seat or back assembly. The springs are, however, secured firmly to the frame, and the plastic is not relied on for rigid attachment. In preferred forms of the invention, the plastic coating has a Shore A durometer between 45 and 90, so that the assembly is held together by the plastic coating without substantially restraining the flexing of the spring wires, and the coating itself provides a spring action between adjacent wires by stretching and contracting, thereby giving a two-way stretch action. |
