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US 4,541,978 AGranted
Extrusion-fill method of producing an elastomeric spring
AssigneeThe Firestone Tire & Rubber Company
InventorsJ. Robert Dieckmann, Michael L. Lauber, Mark R. Roodvoets
Life of this patent
Estimating the term…
Abstract
An elastomeric spring is formed by extruding a rubbery material into a reinforcing sleeve in a mold during relative motion between the mold and nozzle, and thereafter vulcanizing.
Claims3
In the method of producing an elastomeric spring having an outer reinforced sleeve, the steps of
- (1) providing a reinforced elastomer layer against the inner wall of a mold having a closed end;
- (2) placing the mold coaxially with and surrounding a filler means;
- (3) filling the mold from its closed end with elastomer while
- (4) causing the mold and filler means to separate progressively axially;
- (5) severing the fill at the open end of the mold;
- (6) capping the mold;
- and
- (7) vulcanizing the fill and layer.
5 more elements
In the method of producing a rubber spring having a cylindrical outer sleeve, the steps of
- (1) inserting a rubberized fabric sleeve against the inner cylindrical wall of a mold having a closed end;
- (2) moving the mold coaxially about the exterior of an extruder nozzle to surround it;
- (3) filling the mold from its closed end with extruded rubber while
- (4) causing the mold to separate axially from the nozzle;
- (5) severing the fill at the open end of the mold;
- (6) capping the open end of the mold;
- and
- (7) vulcanizing the elastomer and sleeve.
5 more elements
In the method of producing an elastomeric spring having a cylindrical outer sleeve, the steps of
- (1) inserting a cord-reinforced elastomer layer into a mold having a closed end and against its cylindrical inner wall;
- (2) moving the mold over an extrusion nozzle to a position surrounding it and with the nozzle near the closed end;
- (3) extruding elastomer into the mold to fill it from its closed end while
- (4) causing the mold to move axially away from the nozzle;
- (5) capping the mold;
- and
- (6) vulcanizing the extrudate and layer.
4 more elements
Dependencies are inferred from the claim text.