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US 4,528,832 AGranted
Methods and apparatus for increasing the efficiency of tubing extrusion
OwnerFrancis J. Fuchs, Jr.inventor
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OwnerFrancis J. Fuchs, Jr.inventor
Estimating the term…
Extrusion apparatus wherein a hollow cylindrical workpiece is advanced over the outer surface of a mandrel and through an extrusion die by motive force applied to the outer surface of the workpiece by an advancing drive member having an inner surface in operative engagement with the outer surface of the workpiece to produce a hollow cylindrical product of reduced diameter, and wherein a first moving force is required to produce relative movement between the mandrel and the workpiece and wherein a second moving force is required to produce relative movement between the drive member and the workpiece, the improvement wherein various structure are provided for reducing the first moving force relative to the second moving force to enhance the extrusion process and thereby increase its efficiency.
In extrusion apparatus wherein a hollow cylindrical workpiece having inner and outer surfaces is advanced over the outer surface of a stationary cylindrical mandrel and through an annular extrusion die by motive force applied to the outer surface of the workpiece by an advancing drive member having an inner surface in operative engagement with the outer surface of the workpiece to produce a hollow cylindrical product of reduced diameter, and wherein a first moving force is required to produce relative movement between the mandrel and the workpiece and wherein a second moving force is required to produce relative movement between the drive member and workpiece, the improvement comprising
In apparatus including groups of trains of gripping elements for moving in endless paths in continuous operative engagement with the entire outer surface of an elongated hollow cylindrical workpiece to continuously apply motive force to said workpiece to continuously advance said workpiece over the outer surface of a mandrel and through an extrusion die to continuously produce elongated hollow cylindrical product of reduced diameter and indefinite length, and wherein a first moving force is required to produce relative movement between the outer surface of the mandrel and the inner surface of the workpiece and wherein a second moving force is required to produce relative movement between the outer surface of the workpiece and said trains of gripping elements, the improvement comprising:
Dependencies are inferred from the claim text.