Plastic article or earthenware shaping or treating: apparatus – Dipping type shaping means – Dipping form per se
Patent
1989-01-03
1990-07-24
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Dipping type shaping means
Dipping form per se
249177, 249183, 264305, 425274, 425DIG44, B29C 4114
Patent
active
049432257
ABSTRACT:
A one-piece mandrel for making elastomeric articles by a dipping process has a one-piece body which includes at least one opening extending therethrough. A split extends from the opening through a cross-section of the one-piece body. At least a portion of the body adjacent the split is formed of an elastically resilient material to allow the split to open for removal of the elastomeric article after formation, and to cause the split to self-close after removal of the article from the mandrel. Closure of the split forms a substantially continuous molding surface in the immediate vicinity of the split. Proper alignment of the mating surfaces of the split is assured by irregular (non-linear) design of the split surfaces, or by use of an alignment element embedded in the mandrel. An especially advantageous material for forming the mandrel of the present invention is a silicon rubber molding compound. In an alternative embodiment, a cavity is formed in the body portion of the mandrel, and a rigid element is inserted into the cavity to produce a force on the cavity sidewalls. This force is transmitted through the mandrel body ot the mating, facing surfaces of the split, and assists in maintaining the split in a closed position. The mandrel is preferably formed by a molding process. An inner surface of the mold cavity is acid-etched to produce a textured surface on the mandrel.
REFERENCES:
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patent: 2605505 (1952-08-01), Ruhland
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patent: 2824407 (1958-02-01), Ebel
patent: 3436366 (1969-04-01), Modic
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