Patent ID: 6024557
Filing Date: 2000-02-15
Classification: B29C

Abstract:
An extrusion head for a blow-molding apparatus, the extrusion head comprising:an annular and relatively rigid outer housing centered on a housing axis;a rigid ring axially fixed in the housing and shiftable radially of the housing axis in the housing;a sleeve generally coaxially received in the housing and having an upstream end secured to the ring and a downstream end radially elastically deflectable transversely of the housing axis relative to the upstream end;a rigid core coaxially received within the sleeve in the housing and having an outer surface defining an annular passage with an inner surface of the sleeve; andpassage-adjusting means includinga main actuator braced between the ring and the sleeve downstream end for deforming the sleeve downstream end radially of the housing axis relative to the ring, anda secondary actuator braced between the ring and the housing for shifting the ring and sleeve radially of the housing axis relative to the housing, whereby radial dimensions of angularly offset portions of the passage can be locally controlled by combined action of the actuators.