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US 4,229,341 AGranted
Method of making thermally expansible rubber tubes for use in self-closing gas pipes and pipe joints
AssigneesToho Gasu Kabushiki Kaisha, Kabushiki Kaisha Togowa Gomu Seizosho
InventorsYukio Yamaguchi, Kenji Ishihara, Kikuo Yonekura
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Abstract
A method of manufacturing a thermally expansible rubber tube for use in gas pipes and gas pipe joints. About 2 to 30 parts by weight of oxidized, thermally expansible graphite powder is mixed with 100 parts by weight of raw rubber, and a predetermined quantity of a curing agent and a cure accelerator are added to the rubber and graphite mixture, followed by its formation into a tubular shape.
Claims7
A method of manufacturing thermally expansible rubber tube, comprising:
- mixing about 2 to 30 parts by weight of oxidized, thermally expansible graphite powder with 100 parts by weight of raw rubber;
- adding a predetermined quantity of a curing agent and a cure accelerator to cure the mixture of said rubber and graphite;
- and
- forming said mixture into a tubular shape, said rubber tube being thermally expansible from 10 to 500 times in size when heated to between 180.degree. C. and 260.degree.C.
1 more element
Dependencies are inferred from the claim text.