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1. 发明专利

JPH0742884A RUBBER RING FOR COATING CITY WATER PIPE JOINT 失效
公开(公告)号：JPH0742884A
公开(公告)日：1995-02-10
申请号：JP20712293
申请日：1993-07-28
申请人： KURIMOTO LTD , INOUE MTP KK
发明人： KITAGAWA MASAYOSHI , MICHIURA YOSHISADA , SUGIMURA SEIJI , KATO YOSHIKI , KUWABARA HISANOBU
IPC分类号： F16L21/02
摘要： PURPOSE:To prevent degradation of water quality by covering the surface of the rubber of a water-sealing rubber ring for use in the joints of a variety of city water pipes with a flexible resin coating harm less to human, at least over an area where the surface of the rubber could make contact with water passing through a pipe. CONSTITUTION:In a joint where a spigot 2 is fitted into the socket 1 of a cast iron pipe with a bolt and nut 4 tightening a retaining ring 3 and a socket flange together, a rubber ring 5A is interposed between the portion of the spigot 2 pressed by the end of the retaining ring 3 and the retaining ring 3 inside the socket 1, thus sealing water passing through a pipe so that it does not leak outside. In this case, the surface of rubber used in the rubber ring 5A is covered with a flexible coating 6A of a resin harmless to human, at least over an area where the surface could make contact with the water passing through the pipe. The coating 6A is preferably made of an olefine resin such as fluororesins and polyamide resins, so that even if trace amounts of toxic substances are added to the rubber, the coating prevents the toxic substances from dissolving into the water.

2. 发明专利

JPH06322161A METHOD FOR SURFACE TREATMENT OF WATER-SWELLABLE RUBBER 失效
公开(公告)号：JPH06322161A
公开(公告)日：1994-11-22
申请号：JP13688093
申请日：1993-05-13
申请人： INOUE MTP KK , KURIMOTO LTD
发明人： KATO YOSHIKI , KITAGAWA MASAYOSHI , MICHIURA YOSHISADA
IPC分类号： C08J7/00
摘要： PURPOSE:To obtain a method for subjecting water-swellable rubber to surface treatment without especially limiting a water-swellable resin to be used and readily reducing consumption of potassium permanganate in extracting water. CONSTITUTION:In a method for surface treatment, unvulcanized rubber (EPDM) is mixed with water-swellable rubber (e.g. crosslinked polyacrylate-based resin), molded, then vulcanized to produce water-swellable rubber, which is oxidized at least on the surface. The oxidation can be carried out by immersing the water-swellable rubber in an aqueous solution of a peroxide, chlorine or a chlorine compound (sodium hypochlorite). Consequently, consumption of potassium permanganate based on dissolution examination shown by JIS K6,353 can be readily reduced to

3. 发明专利

JPH07317979A PIPE CONNECTION STRUCTURE 失效
公开(公告)号：JPH07317979A
公开(公告)日：1995-12-08
申请号：JP14122694
申请日：1994-05-30
申请人： INOUE MTP KK
发明人： KATO YOSHIKI , HISAJI TETSUYA
IPC分类号： F16L21/08 , F16L33/00 , F16L33/22 , F16L33/28
摘要： PURPOSE:To provide the pipe connection structure which is made up of less components in number, can simply and quickly make pipe connection, and concurrently can make a part of its components common even when one pipe is changed of its size or kind. CONSTITUTION:The pipe connection structure is made up of a cylindrical joint main body 11 where a waved pipe mounting hole formed with a spiral groove in its inner surface is formed at its one side, an attachment mounting hole is formed at the other end, and both the holes are communicated with each other, and of a cylindrical attachment 31 where its outer diameter is roughly identical to the inner diameter of the attachment mounting hole, and a pipe mounting hole is formed through its inside. The end section of a waved pipe 51 formed with a spiral projected section on its outer surface is mounted in the waved pipe mounting hole at one side of the joint main body, and another pipe 53 the end of which is mounted in the pipe mounting hole of the attachment 31, is mounted in the attachment mounting hole at the other side via the attachment.

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