| 摘要 |
<p>A load-supporting structure such as a table, seat, bench, shelf and the like, including at least one stationary member carrying a slidably adjustable surface which is adapted to support a load. The adjustable load-supporting surface has channel means associated therewith in which the stationary member is slidably disposed. A latching mechanism, pivotally carried by the load-supporting surface, is provided to frictionally engage the stationary member in the channel in order to hold the loadsupporting surface in position on the stationary member. The latching mechanism has a positive clamping mechanical advantage so that the frictional pressure exerted by the latching mechanism on the stationary member is directly proportional to the amount of weight placed on the adjustable load-supporting surface. The latching mechanism is so constructed and arranged that upon the application of only a small amount of weight on the load-supporting surface, the frictional pressure of the latching mechanism on the stationary member is so great as to prevent disengagement of the latching mechanism and preclude movement of the adjustable loadsupporting surface.</p> |
