Patent ID: 8568121
Filing Date: 2013-10-29
Classification: B28B,B29C,B33Y

Abstract:
1. An extrusion construction system comprising: an extrusion nozzle configured to extrude a bead of construction material onto an external surface as the extrusion nozzle traverses the external surface; an imaging device configured to capture images of excess construction material which flows out of the extrusion nozzle; and a controller configured to make adjustments to the rate at which the extrusion nozzle extrudes the bead of construction material based on the images so as to cause the flow of the excess construction material to be substantially constant during the traversing, wherein the extrusion nozzle includes a tube having a substantially rectangular cross-section formed by a fixed first, second, third, and fourth wall, wherein the end of the tube is formed by an ending edge of each wall and wherein the ending edges of the first and the second walls lie in a first plane, the ending edge of the third wall lies in a second plane that is substantially different than the first plane, and the ending edge of the fourth wall lies in a third plane that is substantially different than the first and the second planes, and wherein the walls of the nozzle form an opening through which the excess construction material flows.