| 摘要 |
The core 1 of a seat back, which is upholstered to form a complete back, is a moulded plastics sheet bowed forwardly and with attachment points 12 near the top and bottom for securing to a rigid support. The core is constructed to be stiffer over its upper portion the lower, thus when secured, to be able to ripple or alter its curvature between the attachment points. The differential flexibility is achieved by stiffening ribs 15 and/or grooves 9. It may have wings 2 inclining forwardly at each side with closed end slots 3 between the wings and the central zone 8 of the core. The wings can be divided into generally horizontal sections carried by integrally moulded transverse ribs 4 spanning the slots, the division between sections being slots 13 or narrow membranes 6. The top of the core may also be divided into side-by-side sections, the division being by slots 14 or membranes 11.
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