Abstract: A user propelled vehicle comprises a seat frame, a back pivotally connected to the rear of the seat frame about a first pivot axis and a leg support pivotally connected to the front of the seat frame about a second pivot axis parallel to the first. A support surface engaging roller is provided on each of the seat frame and the leg support. The leg support and the seat frames can rollingly approach and retreat from one another along a floor or other support surface between a contracted position, in which the seat frame extends forwardly upwardly and the leg support extends sharply forwardly downwardly from the seat frame, and an extended position, in which the seat frame extends approximately horizontally and the leg support inclines relatively gently to the frame. A hydraulic linkage is provided for maintaining the vehicle in the contracted and extended positions and for maintaining the back in positions extending sharply upwardly from or relatively gently inclining with respect to the seat frame.

Abstract: A security device for personal computers, computer peripherals and similar valuable but readily portable units of equipment includes a tray secured to a working surface by bolts on which the unit is to be used, the tray being of a size to accommodate the unit and having front and back flanges and upward extension from its side walls to restrain the unit from horizontal movement without interference with its functions, the extensions being linked by a normally locked releasable cross bar placed so as to retain the unit in the tray covering the bolts, again without frictional interference with the unit. The tray of one device may be bolted to the cross bar of another security device, as when a monitor is stacked on a computer. The cross bar is preferably hinged to one upward extension and secured to the other by a tamper resistant screw, access to which is through a housing blocked by a removable lock plug and having an axis which is not coincident with that of the screw.