the bottom plate 90 of the hinge 39 s bottom component 88 makes it possible to slide the screen assembly back and forth along arrows e thus clearing the vents for the free passage of air conditioning or defroster air to the windshield another advantage derived from the use of the hinge 20 described in this application is that it provides a suitable piece of hardware for spring loading the screen assembly to facilitate its opening over the windshield by placing a spring 112 either compressively wound around the axle 80 or as illustrated in fig4 in compression between the top plate 92 and the blade 100 the hinge would provide a simple mechanism for partially raising the back portion of all panels of the invention from their substantially horizontal position so that the process of completely raising the panels to their final screen position becomes easier and more functional for a user of course in order to keep the screen assembly in a closed position spring loaded hinges would also require the addition of at least one strap 114 attached to the edge 30 of the bottom panel 14 for connection with fastening means 116 located on the dashboard of the vehicle and capable of releasable engagement with the strap while the embodiments shown in the figures feature the specific shapes therein described the invention can obviously take other shapes with equivalent functionality and utility in.