Sawing jigs for cutting building panels

Claim 1

A SAWING JIG FOR CUTTING BUILDING PANELS OF MAJOR SIZE TO SHAPE AND FOR CUTTING RECTANGULAR OPENINGS INTO THE SAME, COMPRISING AN UPRIGHT FRAME CONSISTING OF A HORIZONTAL FRAME MEMBER AT THE BOTTOM PROVIDED WITH FORWARDLY PROJECTING CARRIERS FOR SUPPORTING THE PANEL THAT IS TO BE CUT, A ROLLER CARRIAGE GUIDED ALONG A HORIZONTAL FRAME MEMBER AT THE TOP, SAID CARRIAGE CARRYING A GUIDE BEAM EXTENDING VERTICALLY DOWNWARDS AND PERMITTING THE SAME TO BE HORIZONTALLY TRAVERSED, A SLIDE ON SAID GUIDE BEAM PROVIDED WITH LOCATING MEANS AND CARRYING A DEFLECTABLY MOUNTED MOTOR-DRIVEN CIRCULAR SAW IN SUCH A MANNER THAT THE SAW CAN BE TILTED FROM A POSITION FOR MAKING A VERTICAL CUT INTO A POSITION FOR MAKING A HORIZONTAL CUT, AND SUPPORT MEANS ON THE FRONT FACE OF THE FRAME FOR SUPPORTING A PANEL RESTING ON THE CARRIERS, CHARACTERISED IN THAT SAID SUPPORT MEANS IS IN THE FORM OF AN ELEVATIONALLY MOVABLE TRELLIS COMPRISING HORIZONTAL BATTENS, TRELLIS BY MOTION TRANSMITTING MEANS OPERABLE BY THE THE TRELLIS BY MOTION TRANSMITTING MEANS OPERABLE BY THE INWARD DEFLECTION OF THE MOTOR-DRIVEN CIRCULAR SAW FOR MAKING A HORIZONTAL CUT, WHENEVER THE BLADE OF THE CIRCULAR SAW HAPPENS TO BE IN ELEVATIONAL ALIGNMENT WITH A BATTEN OF THE TRELLIS AND COULD DAMAGE THE SAME WHEN MAKING THE INTENDED HORIZONTAL CUT.