thereby cancelling their braking function and allows easy movement of the carrier forward and rearward through movement of the rear wheels 30 in fig3 the upper carrying frame 6 includes an upper lift protruding surface 26 which raises the upper carrying frame 6 which is pivotally connected at its rear to the lower base member 10 by pivots 24 as this is happening a series of stepped cantilevered plates 18 suspended on a cantilever suspension means 34 begins to drop relative to the height to which the front of the upper carrying frame is lifted when the upper carrying frame 6 reaches a desired angle or height the dropped cantilevered plates 18 engage in notches 20 formed in a slotted resting member 22 which is attached to the lower base member 10 the notches 20 are formed by a plurality of parallel slots but the holding effect on the cantilevered plates could be achieved with a roughened surface as a result the upper carrying frame 6 with the computer display 4 is 34 locked 34 into place at the desired height or angle the angle of the upper carrying frame 6 may be changed by lifting the upper carrying frame 6 and raising the upper lift protruding surface 26 to free the cantilevered plates 18 from the slotted member 22 the larger cantilevered plates 18 may now be freed to be positioned in the notches 20 and hold the upper carrying frame at a larger viewing angle if downward movement is desired the upper carrying frame 6 is lifted slightly with the upper lift protruding surface 26 to release the engaged cantilever plate which is.