System for cutting fiberglass duct board

Claim 1

A DEVICE FOR USE IN CUTTING FLAT FIBERGLASS DUCT BOARD HAVING A LONGITUDINAL EDGE TO PROVIDE IN ONE SIDE OF THE BOARD A PLURALITY OF GROOVES EXTENDING PARALLEL TO AND OVER THE FULL LENGTH OF SAID EDGE, WHEREBY THE BOARD MAY THEREAFTER BE FOLDED ALONG SAID GROOVES INTO A POLYGONAL CROSS-SECTION DUCT, COMPRISING A FRAME HAVING MEANS FOR THE RECEPTION OF A FLAT DUCT BOARD OF PREDETERMINED MAXIMUM NOMINAL LENGTH AND WIDTH, A PLURALITY OF ELONGATE GUIDE MEANS, MEANS ON THE FRAME PROVIDING A STOP ENGAGEABLE WITH SAID EDGE OF A DUCT BOARD TO LOCATE THE SAME IN A PREDETERMINED POSITION RELATIVE TO THE FRAME, AND MEANS LOCATING EACH OF SAID GUIDE MEANS ON THE FRAME IN A SELECTED ONE OF A PLURALITY OF POSITIONS SPACED APART LATERALLY OF THE GUIDE MEANS, AND GUIDE MEANS EXTENDING OVER SAID MEANS FOR THE RECEPTION OF A DUCT BOARD SO AS TO BE IN CLOSELY OVERLYING RELATION TO A BOARD RECEIVED THEREIN AND EACH HAVING MEANS FOR THE GUIDING OF A CUTTING TOOL IN ITS MOVEMENT LONGITUDINALLY OF THE GUIDE MEANS, SAID GUIDE MEANS BEING SPACED APART A DISTANCE WHICH IS A FUNCTION OF THE DESIRED CROSS-SECTIONAL DIMENSIONS OF A DUCT TO BE FORMED FROM A BOARD CUT USING SAID DEVICE, SAID GUIDE MEANS AND SAID MEANS ON THE FRAME FOR RECEPTION OF A DUCT BOARD HAVING A LENGTH SUBSTANTIALLY IN EXCESS OF SAID MAXIMUM NOMINAL LENGTH, AND ADDITIONAL TOOL-ENGAGEABLE GUIDE MEANS COOPERABLE WITH A TOOL TO PROVIDE A JOINT CUT EXTENDING PARALLEL TO THE GROOVES, SAID ADDITIONAL GUIDE MEANS BEING DISPOSED ON THE SIDE OF SAID FIRST-MENTIONED GUIDE MEANS OPPOSITE SAID STOP, AND MEANS FOR LOCATING SAID ADDITIONAL GUIDE MEAS IN A SELECTED ONE OF A PLURALITY OF POSITIONS IN EACH OF WHICH SAID ADDITIONAL GUIDE MEANS EXTENDS IN PARALLEL CO-PLANAR RELATION TO SAID FIRST-MENTIONED GUIDE MEANS.

Claim 2

A DEVICE FOR USE IN CUTTING FLAT FIBERGLASS DUCT BOARD HAVING A LONGITUDINAL EDGE TO PROVIDE IN ONE SIDE OF THE BOARD A PLURALITY OF GROOVES EXTENDING PARALLEL TO AND OVER THE FULL LENGTH OF SAID EDGE, WHEREBY THE BOARD MAY THEREAFTER BE FOLDED ALONG SAID GROOVES INTO A POLYGONAL CROSS-SECTION DUCT, COMPRISING A FRAME HAVING MEANS FOR THE RECEPTION OF A FLAT DUCT BOARD OF PREDETERMINED MAXIMUM NOMINAL LENGTH AND WIDTH, A PLURALITY OF ELONGATE GUIDE MEANS, MEANS ON THE FRAME PROVIDING A STOP ENGAGEABLE WITH SAID EDGE OF A DUCT BOARD TO LOCATE THE SAME IN A PREDETERMINED POSITION RELATIVE TO THE FRAME, AND MEANS LOCATING EACH OF SAID GUIDE MEANS ON THE FRAME IN A SELECTED ONE OF A PLURALITY OF POSITIONS SPACED APART LATERALLY OF THE GUIDE MEANS, AND GUIDE MEANS EXTENDING OVER SAID MEANS FOR THE RECEPTION OF A DUCT BOARD SO AS TO BE IN CLOSELY OVERLYING RELATION TO A BOARD RECEIVED THEREIN AND EACH HAVING MEANS FOR THE GUIDING OF A CUTTING TOOL IN ITS MOVEMENT LONGITUDINALLY OF THE GUIDE MEANS, SAID GUIDE MEANS BEING SPACED APART A DISTANCE WHICH IS A FUNCTION OF THE DESIRED CROSS-SECTIONAL DIMENSIONS OF A DUCT TO BE FORMED FROM A BOARD CUT USING SAID DEVICE, SAID GUIDE MEANS AND SAID MEANS ON THE FRAME FOR RECEPTION OF A DUCT BOARD HAVING A LENGTH SUBSTANTIALLY IN EXCESS OF SAID MAXIMUM NOMINAL LENGTH, AND ADDITIONAL TOOL-ENGAGEABLE GUIDE MEANS COOPERABLE WITH A TOOL TO PROVIDE A JOINT CUT EXTENDING PARALLEL TO THE GROOVES, SAID ADDITIONAL GUIDE MEANS BEING DISPOSED ON THE SIDE OF SAID FIRST-MENTIONED GUIDE MEANS OPPOSITE SAID STOP, AND MEANS FOR LOCATING SAID ADDITIONAL GUIDE MEAS IN A SELECTED ONE OF A PLURALITY OF POSITIONS IN EACH OF WHICH SAID ADDITIONAL GUIDE MEANS EXTENDS IN PARALLEL CO-PLANAR RELATION TO SAID FIRST-MENTIONED GUIDE MEANS.