| 摘要 |
A foundation unit which can be relaxed in a compact configuration for shipping and which can be then elevated to an expanded state for completion. The foundation unit includes a rectangular grid wire top bearing structure, a rigid bottom substructure, and a series of spaced, parallel intermediate rows of wire supports. The wire supports are oriented in pairs, with the bottom attachment segments of the wire supports being adjacent one another and secured to the bottom substructure. The top attachment segments of the wire supports are spaced from one another such that the wire supports of each pair form a generally V-shaped configuration. The wire supports are sandwiched between spaced longitudinal grid wires of the top bearing structure so that, prior to being secured to the bottom substructure, the wire supports are pivotally secured to the top bearing structures so that the foundation unit can be selectively relaxed for storage or shipping.
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