Machine for extruding hollow cored concrete sections

Claim 1

A MACHINE FOR FORMING HOLLOW CORED CONCRETE SECTIONS ON A LONGITUDINALLY EXTENDING SUPPORTING SURFACE, COMPRISING IN COMBINATION A MAIN FRAME, SAID MAIN FRAME INCLUDING A PAIR OF SPACED AND PARALLEL LONGITUDINAL MEMBERS, MEANS TO SUPPORT AND GUIDE SAID MAIN FRAME ALONG SAID SUPPORTING SURFACE, A SOURCE OF POWER MOUNTED ON SAID MAIN FRAME, A PRODUCT FORMING ASSEMBLY MOUNTED BETWEEN SAID LONGITUDINAL MEMBERS, SAID PRODUCT FORMING ASSEMBLY INCLUDING A FEEDING SECTON, A MOULDING SECTION, AND A TROWELLING SECTION IN LINE WITH ONE ANOTHER, A FEED HOPPER MOUNTED ON SAID MAIN FRAME AND LEADING INTO SAID FEEDING SECTION, AT LEAST ONE AUGER SUPPORTED FOR ROTATION AT ONE END THEREOF ADJACENT SAID FEEDING SECTION AND EXTENDING THROUGH SAID FEEDING SECTION AND SAID MOULDING SECTION SUBSTANTIALLY PARALLEL TO SAID SUPPORTING SURFACE AND SPACED THEREFROM AND LYING SUBSTANTIALLY PARALLEL WITH THE LONGITUDINAL AXIS OF SAID MACHINE, SAID AUGER BEING CONNECTED FOR ROTATION TO SAID SOURCE OF POWER, AND A TROWELLING MANDREL ON THE OTHER END OF SAID AUGER WITHIN SAID TROWELLING SECTION, SAID AUGER ADAPTED TO CONVEY PRODUCT FORMING MATERIAL FROM THE BASE OF SAID HOPPER, THROUGH SAID MOULDING SECTION AND INTO SAID TROWELLING SECTION, AND MEANS ON SAID AUGER, WHICH IN CONJUNCTION WITH SAID MOULDING SECTION, ARE ADAPTED TO COMPRESS SAID MATERIAL RADIALLY WHEREBY THE REACTION OF SAID COMPRESSION WITH THE INERTIAL OF THE FINISHED PRODUCT THEREBEHIND, SELF PROPELS SAID MACHINE ALONG SAID SUPPORTING SURFACE AND AWAY FROM THE PRODUCT FORMED BY SAID MOULDING SECTION THEREBY DRAWING SAID TROWELLING SECTION OVER SAID FORMED PRODUCT, SAID AUGER INCLUDING AN AUGER SHAFT AND AN AUGER FLIGHT FORMED THEREON, THE OUTER DIAMETER OF SAID AUGER FLIGHT BEING SUBSTANTIALLY CONSTANT, THE PORTION OF SAID SHAFT IN SAID FEEDING SECTION HAVING A SUBSTANTIALLY CONSTANT DIAMETER, SAID LAST MENTIONED MEANS ON SAID SHAFT INCLUDING THE PORTION OF SAID SHAFT IN SAID MOULDING SECTION, SAID LAST MENTIONED PORTION GRADUALLY INCREASING IN DIAMETER TO THE DIAMETER OF SAID TROWELLING MANDREL WHEREBY THE DEPTH OF SAID AUGER FLIGHT DECREASES TO ZERO ADJACENT THE AREA JOINING SAID TROWELLING MANDREL AND THE END OF SAID AUGER SHAFT, AND A VIBRATOR ABOVE SAID MOULDING SECTION, A SOURCE OF POWER FOR SAID VIBRATOR, SAID VIBRATOR ADAPTED TO VIBRATE SAID MOULDING SECTION.