| 摘要 |
An adjustable height table assembly consists of a table top (12) and an adjustable leg (20) and base (14) structure to which the table top is mounted. The leg and base structure includes a leg to which the table top (12) is mounted, and a base (14) to which the leg (20) is mounted for vertical movement. The base (14) includes a pair of vertical guide shafts (52, 54), and a bearing assembly (73) is secured to the leg and mounted to the guide shafts for providing vertical movement of the leg relative to the base. An adjustment mechanism includes a lead screw (86) extending through the leg and threadedly engaged with a lead nut (70) secured to the base between the guide shafts, and a chain (108) and sprocket (90, 92) system selectively imparts rotation to the lead screw upon manual operation of a crank (106). The spaced guide shafts (52, 54) provide a high degree of stability to the leg and table top, even when the table top is raised to its upward most position. The chain (108) and sprocket mechanism (90, 92) for imparting rotation to the lead screw enables the drive sprocket to be positioned in any location relative to the top.
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