| 摘要 |
A pivotally articulated, foldable load-support device, comprising two oppositely inclined, intersecting leg frames, being joined by aligned pivotal connections at two pairs of upper pivot-points above the intersection of the leg frames to an upper load-bearing structure, and being joined by aligned pivotal connections at two pairs of lower pivot-points below the intersection of the leg frames to a lower load-bearing structure. Each load-bearing structure is divided, by relative placement of the paired pivot-points joining such load-bearing structures to the leg frames, into mutually co-responsive, load-distributing, balancing, load-reapportioning, and counterbalancing front, intermediate, and rear load-sharing portions thereof. Dimensions of leg frames and of load-bearing structures, and relative positions of the four paired pivot-points are proportioned so that, when not in operation, the device can be folded substantially flat, the rear leg frame nesting within the upper and lower load-bearing structures, the upper and lower load-bearing structures nesting within the front leg frame, and all leg-frame side-elements, all load-bearing structure side-elements, and all pivot-points thereby substantially occupying a single plane. In table form, the upper load-bearing table-top structure cooperates and counterbalances in load-sharing relationships and in reciprocating pivotal actions with the lower load-bearing footrest structure. Similarly, in chair form, the upper load-bearing seat structure cooperates and counterbalances in reciprocating, load-sharing, counterbalancing relationships with the lower load-bearing footrest structure and cooperates in direct load-support relationships with the backrest. Variant configurations of chair and table embodiments are also disclosed.
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