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1. 发明专利

JPH09273678A MECHANICAL PIPE COUPLING 失效
公开(公告)号：JPH09273678A
公开(公告)日：1997-10-21
申请号：JP8276096
申请日：1996-04-04
申请人： NIPPON KOKAN KK , N K K SOGO SEKKEI KK
发明人： MUROTA KAZUMASA , TANAKA TOSHIYA , YAMADA TAKAHISA , ARAI HIDETOSHI , SUZUKI NORIKAZU
IPC分类号： F16L21/08
摘要： PROBLEM TO BE SOLVED: To improve watertightness by a packing as well as to reliably perform pipe connection in a short time. SOLUTION: When an inserting pipe 11 is inserted into a socket 3, a stopper 4 projecting into the inside of the socket 3 by the action of a spring is pressed by a projecting part 1 and projected to the outside of the socket 3 against spring force. When the insertion of the inserting pipe 11 is progressed after the stopper 4 is further turned, the engagement of the projecting part 1 and the stopper 4 is released, the stopper 4 is again projected to the inside by the spring, a protrusion 8 is brought in contact with the outer peripheral surface of the socket 3, and the rotation is stopped. Since the projecting part 1 is brought in contact with the stopper 4 even if drawing force is generated on the projecting part 1, the inserting pipe 11 is prevented from slipping off from the socket 3. A packing 2 provided on the pipe end of the inserting pipe 11 is sealed in an approximately cylindrical space formed of a parallel part (a) of a receiving pipe 12 provided with the socket 3, the inserting pipe 11, and a seal stopper 13 provided on the inserting pipe 11.

2. 发明专利

JPH04165177A JOINT CONNECTOR FOR RIBBED RESIN TUBE 失效
公开(公告)号：JPH04165177A
公开(公告)日：1992-06-10
申请号：JP28833090
申请日：1990-10-29
申请人： NIPPON KOKAN KK
发明人： NEMOTO MINORU , HAGIO AKIRA , NAKAJIMA TAKASHI , OBATA YASUO , TANAKA TOSHIYA , YAMADA NAOKI
IPC分类号： F16L1/00
摘要： PURPOSE:To facilitate joint connecting work and prevent local stress from acting upon tubes and ribs by placing a connector on a leveled base, and providing the connector with circular grooves for fitting the tube ribs therein and circular support faces for supporting the tube outer face. CONSTITUTION:After rolling compaction and leveling are performed to the floor bases 50 of a place for burying ribbed large bore resin tubes 1, a part 53 for installing the socket 12 of a joint 10 is digged further deeper, and connectors 20 are placed on the floor bases 50. The resin tubes 1 are placed on the connectors 20, and the ribs 3 of the tubes 1 are fitted into the circular grooves 22 of the connectors 20 so as to support the outer faces of bodies 2 on the circular support faces 21. The alignment of the tubes 1 to be connected to each other can be thus performed, and a spigot 11 is moved together with the connector 20 toward the socket 12 to connect a joint 10. Since gaps among the floor base 50, the body 2, the ribs 3 are completely buried by the connector 20, such work as to fill sand into the gaps and harden it can be omitted, and stress acting upon the body part 2 and the ribs 3 becomes uniform.

3. 发明专利

JPH04185991A PROTECTOR FOR RESIN PIPE WITH RIB 失效
公开(公告)号：JPH04185991A
公开(公告)日：1992-07-02
申请号：JP31133490
申请日：1990-11-19
申请人： NIPPON KOKAN KK
发明人： NEMOTO MINORU , NAKAJIMA TAKASHI , OBATA YASUO , TANAKA TOSHIYA , NAKANO TAKASHI , AOKI MASANORI
IPC分类号： F16L21/00 , F16L21/02
摘要： PURPOSE:To prevent leakage so as to further improve earthquake resistance by forming a protector, which is provided with a thickness of rib height or more further with a smooth external surface to cover a main unit except a spigot part of a joint part, with a light weight foaming material, in the case of the protector of a rib-provided resin pipe for a water intake pipe or the like. CONSTITUTION:A mold for covering a part of ribs 12 of a rib-provided large bore resin pipe 1 is provided and charged with foaming styrene heated by the method of internal mold to integrally form a protector 2. In the protector 2, only a part of a spigot 14 in a joint part 10 is not covered and also molding the protector to a thickness of height or more of the rib 12 to smoothly form an external surface 21 by burying a part between the ribs 12. A socket 13 may be covered or not, but by covering the socket, a space mutually between the protectors 2, when the pipe is connected, can be eliminated.

4. 发明专利

JPH04160288A COUPLING FOR RESIN PIPE OF LARGE BORE 失效
公开(公告)号：JPH04160288A
公开(公告)日：1992-06-03
申请号：JP28341990
申请日：1990-10-23
申请人： NIPPON KOKAN KK
发明人： NEMOTO MINORU , NAKAJIMA TAKASHI , OBATA YASUO , TANAKA TOSHIYA , NAKANO TAKASHI , YAMADA NAOKI
IPC分类号： F16L27/12
摘要： PURPOSE:To make a packing always fastened by providing a projection with a diameter the same as the bore of a spigot in the inner part of a faucet, and a projection at the outer part of the spigot, arranging a packing to seal a clearance between the spigot and the faucet, and providing a stopper at the inner surface of the faucet. CONSTITUTION:In a coupling 20, a spigot 11 and a faucet 12 are connected by a packing 14, and the coupling 20 can move freely in the axial direction between a projection 21 and a stopper 22 coping with a deformation of the ground to some extent, and the surface pressure of the packing 4 is scarcely changed from the setting time. When the deformation is of a tension operation, the projection 23 of the spigot 11 and the stopper 22 of the faucet 12 hit, and the slopes 26 and 27 formed at the hitting surface are engaged each other, to contract the faucet 12 in the radial direction. On the other hand, when the deformation is of a contraction operation, a slope 24 of the end face of the projection 21 and a slope 25 of the end face of the spigot 11 hit each other to expand the spigot 11 in the radial direction. In such a way, the packing 14 is fastened constantly either to the tension or the contraction, and thereby a good sealing property is exercised to a large deformation of the ground owing to an earthquake and the like, and no leakage is generated.

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