Patent ID: 8061173

Claim:
Continuous extrusion apparatus, comprising: a) a plurality of spaced apart circumferential grooves; b) arcuate tooling with a shoe portion bounding radially outer portions of respective grooves provided with exit apertures extending in a generally radial direction from the respective grooves to a chamber; c) abutments displaced in the direction of rotation from the exit apertures extending into the grooves; d) the chamber extending around an extrusion mandrel assembly, and the exit apertures discharging axially of the extrusion mandrel assembly through a die orifice intermediate the extrusion mandrel assembly and an extrusion die body wall; e) the extrusion mandrel assembly including: i) a lobed, mushroom shaped, dolly formed with a central spacing stem located in the chamber adjacent a pair of discharge ports connecting respective exit apertures into an internal cavity in the chamber; ii) a pair of shaped lobes having rear faces extending from the central spacing stem; iii) outer edge portions and front faces merging into a collar around a neck co-acting with an annular shoulder on the extrusion die body to form an annular extrusion gap; and iv) each of the lobes being profiled such that frictional surface drag on extruding material is substantially uniform around the lobed dolly.