Adjustable screen cloth stretcher

Claim 1

APPARATUS FOR STRETCHING SCREEN CLOTH COMPRISING: A FRAME HAVING SPACED VERTICAL SIDEWALLS EXTENDING ALONG OPPOSITE SIDES THEREOF, SAID SIDEWALLS HAVING A SERIES OF APERTURES EXTENDING ALONG THE LENGTH THEREOF; A SCREEN CLOTH EXTENDING ALONG SAID FRAME IN A GENERALLY HORIZONTAL PLANE, SAID SCREEN CLOTH COMPRISING LONGITUDINAL WIRED AND CROSS WIRES, SAID CROSS WIRES HAVING UPWARDLY BENT HOOKS AT EACH END THEREOF; A PAIR OF ELONGATED SCREEN CLOTH CLAMPS, EACH CLAMP HAVING A PAIR OF SPACED PARALLEL EDGES, IN DIFFERENT PLANES, ONE OF WHICH IS SLIDABLY MOUNTED ON THE INNER FACE OF A RESPECTIVE ONE OF SAID SIDEWALLS AND ANOTHER OF WHICH IS ADAPTED TO ENGAGE THE HOOKS ON A RESPECTIVE MARGIN TO SAID SCREEN CLOTH; A PLURALITY OF THREADED TENSIONING BOLTS EXTENDING OUTWARDLY FROM EACH OF SAID CLAMPS BETWEEN THE EDGES THEREOF AND ADAPTED TO EXTEND THROUGH THE APERTURES IN SAID SIDEWALLS; A FIRST PARTI-CYLINDRICAL SURFACE FORMED IN THE OUTER FACE OF EACH OF SAID SIDEWALLS GENERATED ABOUT A HORIZONTAL AXIS OF GENERATION SPACED A SUBSTANTIAL DISTANCE OUTSIDE SAID SIDEWALL AND PARALLEL TO SAID SERIES OF APERTURES; A PLURALITY OF ADAPTERS ONE FOR EACH BOLT AND EACH HAVING A SECOND PARTI-CYLINDRICAL SURFACE ENGAGEABLE WITH SAID FIRST PARTI-CYLINDRICAL SURFACE; AND THREADED TENSIONING MEANS ENGAGEABLE WITH RESPECTIVE BOLTS AND ADAPTERS AND EFFECTIVE TO PULL THE CLOTH ENGAGING EDGE OF SAID CLAMP IN A DOWNWARDLY AND OUTWARDLY CURVED PATH TOWARD A RESPECTIVE SIDEWALL.