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
Patent
1994-11-15
1996-07-16
Thurlow, Jeffery R.
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
156140, 264236, 264347, 425 281, 425 342, 425343, 425384, 425446, B29C 3504, B29C 3304
Patent
active
055364640
ABSTRACT:
The present invention provides novel apparatus and a novel method for manufacturing an endless rubber track for large vehicles such as tractors or earth-moving machines. A plurality of sprocket-engaging core bar inserts are disposed in the inner portion or inner diameter of the endless rubber track to engage the power drive mechanism of the vehicle. Rubber tread is disposed on the outer portion or external diameter of the rubber track. Although the rubber track is made in segments, it is completely vulcanized, and does not have discontinuous, unvulcanized regions between vulcanized segments. Rubber track is formed using at least two different mold assemblies. In the first mold assembly, the interior and exterior portions of the rubber track are molded onto a green belt to form a first segment, and a central portion of the segment is vulcanized. In the second mold assembly, the interior and exterior portions of the rubber track are molded onto an adjacent section of the green belt to form a second belt segment, and the second segment along with the adjacent unvulcanized first segment is vulcanized.
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Bridgestone/Firestone Inc.
Santa Maria Carmen S.
Thurlow Jeffery R.
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