Trolley base with height adjuster

Claim 1

In combination, a foldable trolley base having a folded position and an unfolded, erected working position, and comprising a base means, a load supporting means and two side members adjustable in height and connecting the base means and the load supporting means, the side members each having a lower portion and an upper portion, each upper portion forming part of the load supporting means and being movable vertically relative to its lower portion to effect height adjustment of the side member, the lower portions of the side members being connected to one another by cross members having central portions pivotally connected to one another by a pivot member, the side members being adjacent one another when the trolley base is in the folded condition and spaced apart from one another when the trolley base is in the unfolded, erected working position, and a completely detachable lifting attachment for lifting the load support means with respect to the base means, the lifting attachment comprising an expansible guide column and an extensible strut means connected with the guide column such that extension of the strut means expands the column, the guide column having a lower portion and an upper portion and a bridging member connected to the upper portion, the lifting attachment having detachable fastening means for attachment to and detachment from the trolley base, whereby the lifting attachment is attachable to the trolley base in its unfolded, erected working position with the bridging member connected to the guide column and detachably connected to each of the side members.