Molding an elastomeric ring while bonding it to a metal case and

Details Molding an elastomeric ring while bonding it to a metal case and Molding an elastomeric ring while bonding it to a metal case and

1984-03-12

1985-11-26

Weston, Caleb

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

294695, 295271, 156245, 156500, 264268, 425DIG47, B29D 300

Patent

active

045553769

ABSTRACT:
Method and apparatus for molding an elastomeric component of a shaft seal while bonding it to a fluorocarbon seal lip member. The lip member is initially shaped as a flat washer, and a radially outer portion is flexed during molding to a frustoconical shape. Positive retention of the fluorocarbon washer during molding is assured. Radially inner portion of the fluorocarbon washer rests on a planar annular mold ledge, its radially outer portion overhanging a frustoconical mold surface. A ring of uncured elastomer is located above that radially outer portion and radially inwardly from the outer periphery of the ledge. The radially inner portion has a horizontal toothed mold portion with a series of concentric sharp tooth edges. This directly engages the upper surface of the washer and clamps it firmly and immovably against the ledge. When the mold is closed, the elastomer flows and forces the outer portion of the washer down on frustoconical mold surface while bonding elastomer to washer.

REFERENCES:
patent: 3841809 (1974-10-01), Tucker
patent: 3985487 (1976-10-01), Clark
patent: 3993420 (1976-11-01), Haas et al.
patent: 4171561 (1979-10-01), Bainard et al.
patent: 4406847 (1983-09-01), O'Neal et al.
patent: 4464322 (1984-08-01), Butler

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