Abstract: A gravel delivery truck is disclosed, which carries a moving belt conveyor, on a boom that can swing over the delivery site. The boom is foldable for stowage on the truck. The boom includes a foldable extension, hinged to the main length of the boom. For stowage, the extension is doubled over the main length, and the main length is placed lengthwise, behind the driver's cab, down one side of the truck, and over the rear wheels. The folded-over extension fits into the space ahead of the rear wheels, underneath the main length. The layout of the hinge joint is such that, during folding of the boom, the total length of the run of the belt remains the same. The belt can be kept running, and delivering, at all angles of fold of the boom, and even while the boom is being folded.

Abstract: A telescopic mast for a fork lift truck is disclosed. The telescoping sections of the mast are arranged with the innermost section as the base section, which remains attached to the frame of the truck. The telescoping hydraulic tubes or cylinders are arranged so that the innermost tube is associated with the outermost mast-section. This outside-to-inside arrangement makes it possible for the mast sections to be provided with cross-braces and rails, and still to be telescope-able. The resulting mast-sections are very rigid and stable, yet are light in weight. As the sections are raised, the area exposed to hydraulic pressure becomes progressively less, with the result that the height to which a load can be raised is automatically limited.