Patent ID: 6727457
Filing Date: 2004-04-27
Classification: B08B,B23K,B23Q

Abstract:
In a metal cutting table having a perforated work surface supported on a frame, ends and sides on the frame defining a chamber below the work surface, a cutting head moveable relative to the work surface, and a ventilation system including a suction source for drawing air downwardly through the work surface, a draft control and debris collection apparatus comprising:a) one or more partitions positioned beneath the work surface and dividing the chamber into a plurality of suction zones, each of said suction zones communicating with the suction source; b) a plurality of dampers, each of said dampers being positioned beneath the work surface within a respective one of said suction zones and including a damper flap, each said damper flap having a proximate end pivotally connected to the frame and a distal end opposite said proximate end, each said damper flap being moveable between an open position and a closed position so as to selectively control airflow through said respective suction zone between the suction source and the work surface, said distal end extending downwardly from said proximate end in said open position; and c) means for opening selected ones of said damper flaps when the cutting head is moved proximate the respective suction zone and closing said damper flaps when the cutting head moves away from the respective cutting zone; and d) a plurality of debris collection receptacles, one of said receptacles being positioned beneath each of said damper flaps such that when said dampers are in said open position debris falling through the work surface is directed into said receptacles by said damper flaps.