Reinforced cab construction with adjustable closure panel arrangement

Claim 1

A DEMOUNTABLE CAB BODY FOR TRACTORS AND THE LIKE, SAID CAB BODY COMPRISING A RELATIVELY THIN UNITARY SHEET METAL SIDEWALL SECTION AND A RELATIVELY THIN SHEET METAL TOP SECTION SECURED TO THE UPPER PORTION OF THE SIDEWALL SECTION TO FORM A FLEXIBLE CAB BODY OF EXTREMELY LIGHTWEIGHT, SAID SIDEWALL SECTION BEING RECESSED TO FORM TWO OPPOSITE ACCESS OPENINGS, A PAIR OF ARCHED CHANNELED FRAMING MEMBERS SECURED TO THE INNER SURFACE OF THE TOP SECTION IN SPACED APART RELATION TO ONE ANOTHER TO CONSTITUTE ROOF FRAMES FOR IMPARTING RIGIDITY TO SAID TOP SECTION AND SOLIDILY JOINING THE TOP SECTION TO THE SAID SIDEWALL SECTION, SAID CHANNELED FRAMING MEMBERS EXTENDING VERTICALLY DOWNWARDLY OVER THE EDGES OF THE RACCESS APERTURES IN SNUGLY FITTED RELATIONSHIP THEREWITH AND PRESENTING OUTER U-SHAPED FRAME PORTIONS WHICH OVERLAP THE OUTER SURFACE OF THE ACCESS OPENINGS TO PROVIDE EXTERNAL SIDEWALL SECTION STIFFENING, SAID CHANNELED FRAMING MEMBERS ALSO EXTENDING INTERNALLY ALONG THE INSIDE OF THE SIDEWALL SECTION MEMBERS FOR AN APPRECIABLE DISTANCE TO PROVIDE RELATIVELY WIDE INNER WALL STIFFENING AREAS, SAID CHANNELED FRAMING MEANS BEING STILL FURTHER FORMED WITH ANCHORING FLANGES AND FASTENINGS DRIVEN THROUGH THE AHCHORING FLANGES AND ADJACENT SIDEWALL SECTIONS TO SOLIDLY LOCK THESE PARTS TOGETHER AND SAID CHANNELED FRAMMING MEMBERS BEING RECESSED TO PRSENT TWO PARALLEL GUIDEWAYS EXTENDING ALL THE WAY