Plastic article or earthenware shaping or treating: apparatus – Reshaping – resizing or vulcanizing means for tire – tire... – Internal mold – form or support for toroid
Patent
1978-03-20
1979-12-04
Tillman, Murray
Plastic article or earthenware shaping or treating: apparatus
Reshaping, resizing or vulcanizing means for tire, tire...
Internal mold, form or support for toroid
264317, B29H 518
Patent
active
041770277
ABSTRACT:
Apparatus includes a rigid mold body and an expandable bladder associated therewith. The bladder is inflatable and expandable to form and press sand core material between itself and the mold body while exerting uniform compressive force over the total surface area of the core material thereby forming a portion of a hollow core of precise external dimension and uniform overall strength. Roll-restraining hoop members can be molded into the sand core at the surface facing the axis of the annulus. A pair of such cores forms a hollow core with two sets of hoops on which a tube-tire is formed.
REFERENCES:
patent: 867688 (1907-10-01), Waldron
patent: 1704538 (1929-03-01), Hatfield
patent: 2973562 (1961-03-01), Miller
patent: 3156958 (1964-11-01), Miller et al.
patent: 3606921 (1971-09-01), Grawey
Ball Glenn A.
Grawey Charles E.
Zook Donald G.
Caterpillar Tractor Co.
Grant John W.
Koeckert Arthur H.
Tillman Murray
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