Plastic article or earthenware shaping or treating: apparatus – Dipping type shaping means – Dipping form per se
Patent
1987-03-10
1989-01-10
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
Dipping type shaping means
Dipping form per se
249177, 249183, 425DIG44, B29C 6724
Patent
active
047970812
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 immediately vicinity of the split. Proper alignment of the mating surfaces of the split is assured by irregular (non-planar) design of the split surfaces, or by use of an alignment element embedded in the mandrel. In embodiments where a ferro-magnetic alignment element is used, a separate magnetized element may also be embedded in the mandrel to assist in holding the split closed during the dipping process. If necessary or desired, both elements may be magnetized.
REFERENCES:
patent: 1841886 (1932-01-01), Gammeter
patent: 1948608 (1934-02-01), Abbott, Jr.
patent: 1997784 (1935-04-01), Beal
patent: 2053372 (1936-09-01), Lee
patent: 2298101 (1942-10-01), Beal
patent: 2801897 (1957-08-01), Fry
patent: 3436366 (1969-04-01), Modic
patent: 3847848 (1974-11-01), Beers
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