| 摘要 |
A pair of support brackets (36, 38) are spaced along and interconnect a pair of spaced and parallel support members (16, 18) and a pair of support legs (20, 22) are pivotally connected (28) to each support bracket (36, 38) for pivotal movement between a support position extending downwardly from said support members (16, 18) and a closed position underlying said support members (16, 18). A pair of wheels (48) may be removed from a pair of legs and rotatably supported on one of the support brackets (36, 38) for transport of the assembly in the folded position. Each of a pair of transverse rails (60) includes a C-shaped channel (71) facing the opposite rail (60) for supporting the opposite edges of a board (73). A support bar (107) is disposed in telescoping relationship within each of the support members (16, 18) for vertically supporting (106) a horizontal guide member (110).
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