Importance

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Abstract

A device (10) is disclosed including a shelf (80) mounted to a lift tube (76) of a lift sub-assembly (74). An adjustment cone (88) is secured to the lower end of a rod (86) having its upper end pivotably secured to a handle (82) in turn pivotably secured adjacent the upper end of the lift tube (76). The lift tube (74) is slideable in cylindrical inner surfaces (58) of top and bottom bushings (50, 68) separated by positional spacers (66) having inner surfaces spaced from the lift tube (76). Indexing spacers (26) are slideably received and stacked end-on-end inside a vertical tube (18) below the bushings (50, 68) and the positional spacers (66). The lower ends of flexible fingers (92) of the adjustment cone (88) abut with an annular shoulder portion (36) formed in each of the indexing spacers (26) when the adjustment cone (88) is in its extended position relative to the lift tube (76) to prevent vertical movement therebeyond and allowing the ends of the fingers (92) to move in a circular path on the annular shoulder portion (36). In the retracted condition of the adjustment cone (88), the fingers (92) are pulled partially inside the lift tube (74) to a size which passes through the annular shoulder portions (36) without abutment. In the preferred form, the fingers (92) have a size which prevents passage through the cylindrical inner surface (58) of the bottom bushing (50) to prevent removal of the lift sub-assembly (74) from the vertical tube (18).

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First Claim