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US 4,309,161 AGranted
Apparatus for the injection molding of radial endless tire-tread rings
AssigneeFried. Krupp Gesellschaft mit beschrankter Haftung
InventorsGerd Krebs, Rainer Friedrich, Hans-Peter Saul
Life of this patent
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Abstract
An apparatus for the injection molding of tire treads on reinforcing belts (tire-tread rings) comprises a belt support which is substantially incompressible but is yieldably mounted on a back-up structure and defines a mold cavity with a pair of half shells which close around the support. When the injection-molded tread is released by opening of the half shells, the support can be relaxed and the tread structure picked up by a transfer ring.
Claims16
An apparatus for the forming of tread rings, e.g. for pneumatic tires, comprising:
- an elastic mandrel of substantially incompressible material having a generally cylindrical portion for widening of a belt thereon;
- at least two shells adapted to enclose said mandrel and defining a mold cavity therewith;
- means for injecting an elastomer into said cavity;
- and
- a metal ring-shaped backing member supporting said mandrel,
- said backing member and said mandrel being mounted upon a core, said core being formed with a pair of annular cylinders provided with respective cones engaging opposite sides of said mandrel for sealing said sides of said mandrel against said shells.
3 more elements
Dependencies are inferred from the claim text.