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1. 发明专利

JPH11248078A BRANCH PIPE FOR POLYOLEFIN PIPE 失效
公开(公告)号：JPH11248078A
公开(公告)日：1999-09-14
申请号：JP5404498
申请日：1998-03-06
申请人： KUBOTA KK
发明人： SAKAGUCHI MASAYUKI , UJIIE MITSUHARU , KAKEHASHI KOICHIRO
IPC分类号： F16L41/08
摘要： PROBLEM TO BE SOLVED: To prevent a tensile force from acting on a bored part by receiving a tensile force generated at piping operations. SOLUTION: A branch pipe is composed of a trunk part 3 to be mounted on a polyolefin piping 1 and a body part 4 branching, and a sealing material 7 installed on the inner surface of the trunk part 3 to form a seal with respect to the outer surface of the piping 1 is installed as surrounding an opening 8 bored in the piping 1 in such a way as mating with the body part 4. A groove 9 formed at the inner surface of the trunk part 3 as stretching in the circumferential direction is provided outside the sealing material 7, and teeth to be fitted on the outer surface of the piping 1 are formed on a locking member 10 installed in the groove, and an abutting surface of the groove 9 to the locking member 10 is formed as a taper surface 9a with diameter reducing outward about the axial direction of the piping 1.

2. 发明专利

JPH10132179A SCREWING-TYPE POLYOLEFIN SPIGOT 失效
公开(公告)号：JPH10132179A
公开(公告)日：1998-05-22
申请号：JP28382996
申请日：1996-10-25
申请人： KUBOTA KK
发明人： KAKEHASHI KOICHIRO , UJIIE MITSUHARU
IPC分类号： F16L57/00 , F16L37/24
摘要： PROBLEM TO BE SOLVED: To omit labor for after-inserting (pressing) a reinforcing material into a spigot, so as to improve workability, by integrally molding the spigot and the reinforcing material (a stiffener). SOLUTION: A stiffener 26 as a reinforcing material for supporting a pipe wall is arranged on the inner peripheral surface of a spigot 10 in relation to an external thread part 12. The stiffener 26 is formed of metal such as stainless steel into an approximately cylindrical shape. The spigot 10 and the stiffener 26 are integrally molded by a known injection-molding method. That is, a core mold to which the stiffener 26 is attached is arranged in a main mold, and polyolefin synthetic resin is injected into the main mold.

3. 发明专利

JP2003130265A SOCKET WITH BUILT-IN RELEASE PREVENTOR AND RELEASE PREVENTIVE RING 审中-公开
公开(公告)号：JP2003130265A
公开(公告)日：2003-05-08
申请号：JP2001327481
申请日：2001-10-25
申请人： KUBOTA KK
发明人： KAKEHASHI KOICHIRO , SAKAMOTO HIROAKI , NAKAMURA AKIRA , INAI TOMOAKI , NAKAMURA RYOICHIRO
IPC分类号： F16L21/08
摘要： PROBLEM TO BE SOLVED: To easily inspect the rolling of a rubber ring since a recessed part is formed in a ring, and re-connect by extracting an insertion port from a socket since a release preventive ring can be easily diametrally expanded. SOLUTION: The release prevention ring 34 and the rubber ring 28 are installed in the socket 16 in this order from an opening edge 16a side, and four recessed parts 42 are formed in the inner surface of the ring 34. When the rubber ring 28 is checked for its rolling, a check gauge 56 is inserted from the opening edge side of the socket 16, and the tip thereof is pressed against the side surface of the rubber ring 28 through the recessed parts 42. When the ring 34 is diametrally expanded, the tip of a first diameter increasing tool is inserted from the opening edge side of the socket 16, and the projected part at the tip thereof is pressed into the recessed parts 42.

4. 发明专利

JP2002039461A REMOVAL PREVENTIVE FITTING 失效
公开(公告)号：JP2002039461A
公开(公告)日：2002-02-06
申请号：JP2000222653
申请日：2000-07-24
申请人： KUBOTA KK
发明人： NAKAMURA AKIRA , KAKEHASHI KOICHIRO
IPC分类号： F16L21/08 , F16L27/12
摘要： PROBLEM TO BE SOLVED: To correspond to plural types of pipe joints. SOLUTION: An arm 28 has a first ring portion 48a and a second ring portion 48b as socket engagement portions and a first engagement portion 50a and a second engagement portion 50b as spigot engagement portions. Distances between the first ring portion 48a and the second engagement portion 50b, between the first ring portion and the first engagement portion 50a and between the second ring portion 48b and the first engagement portion 50a are set to be lengths La, Lb, Lc, respectively, corresponding to other types A, B, C of pipe joints to be mounted. Therefore, the arm 28 serves for plural types A, B, C of pipe joints.

5. 发明专利

JPH11344142A POLYOLEFIN RESIN VALVE 失效
公开(公告)号：JPH11344142A
公开(公告)日：1999-12-14
申请号：JP15344498
申请日：1998-06-03
申请人： KUBOTA KK
发明人： SAKAGUCHI MASAYUKI , KAKEHASHI KOICHIRO , UJIIE MITSUHARU
IPC分类号： F16K27/00
摘要： PROBLEM TO BE SOLVED: To reduce the creep strain of a valve casing by an inexpensive means by reinforcing a peripheral surface on a tube axial of the valve casing and a peripheral surface on a valve axial of the valve casing by a reinforcement body, and to obtain the high sealability by keeping the resilience of the seal rubber between a valve seat and the valve casing for a long time. SOLUTION: A reinforcement body 3 is formed by integrally connecting an upper end of a U-shaped reinforcement band 3a to an intermediate portion of a bisected ring 3b by welding, adhesion or the like. The U-shaped reinforcement band 3a is contacted with an outer periphery 2a on the tube axial P of a valve casing 2, the bisected ring 3b is wound on the outer periphery on a valve axial V of the valve casing 2, the joint pieces 3d are fastened by the bolt nuts 4 to contact the joint pieces 3d to the outer surfaces of the outer peripheries 2a, 2b of the valve casing 2 without a gap. Accordingly the valve casing 2 is reinforced by the reinforcement body 3, and the deformation can be prevented even when the pressure in the valve casing is increased, or the pressure contact force of the seal is continuously added in the opening and closing of the valve for a long time.

6. 发明专利

JP2002276877A INNER CORE 失效
公开(公告)号：JP2002276877A
公开(公告)日：2002-09-25
申请号：JP2001077756
申请日：2001-03-19
申请人： KUBOTA KK
发明人： KAKEHASHI KOICHIRO , BAI HIDEKI , MURAKAMI KEISHI , HARADA TAKATOMO
IPC分类号： F16L33/22
摘要： PROBLEM TO BE SOLVED: To surely fix an inner core at a tube end with preventing misalignment of the inner core to a direction of falling off from a tube without being affected by variation of inner diameters of tubes and to easily detach the inner core from the tube end and to reduce manufacturing cost by utilizing external thread and internal thread. SOLUTION: A internal thread part 34 is formed on a tube wall of a short tube part 28 of the inner core 10 and is threadedly engaged with an external thread part 36. The external thread part 36 is threadedly engaged with the internal thread part 34 formed on the short tube part 28 and fastened under a condition that the short tube part 28 of the inner core 10 is inserted into a tube end of a tube 14 and a tip thereof is pressure-contacted on an inner surface 14b of the tube 14. Accordingly, the inner core 10 can be fixed at the tube end of the tube 14 by adjusting a threadedly engagement position of the external thread part 36 to the internal thread part 34 even if the tube 14 has variation of inner diameter.

7. 发明专利

JP2002228064A PUSH RING FOR PIPE JOINT, AND PIPE JOINT 失效
公开(公告)号：JP2002228064A
公开(公告)日：2002-08-14
申请号：JP2001024085
申请日：2001-01-31
申请人： KUBOTA KK
发明人： KAKEHASHI KOICHIRO , BAI HIDEKI , MURAKAMI KEISHI , HARADA TAKATOMO
IPC分类号： F16L21/04
摘要： PROBLEM TO BE SOLVED: To provide a push ring for a pipe joint, and the pipe joint in which an expansion part is formed and a lock ring is built in the push ring, and the expansion part and the lock ring can be integrated with each other, the cost of parts can be reduced, the pipe joint and a resin pipe can be easily joined with each other in a short time as scheduled without requiring any working skill. SOLUTION: In the pipe joint 10, the push ring 20 is tightened to a flange 32 of a flanged body 14 by a bolt 26 and a nut 28, and the push ring 20 is provided with a lock ring accommodation part 56 having first and second tapered surfaces 44 and 46 with an expansion part 42 for compressing a packing 22 fitted to an end of the body 14 and the lock ring 24 biting in the resin pipe 12 inserted from the end of the body which are built therein and for contracting the lock ring 24.

8. 发明专利

JPH10325492A SCREW COUPLING JOINT FOR POLYOREFIN PIPE 失效
公开(公告)号：JPH10325492A
公开(公告)日：1998-12-08
申请号：JP13644597
申请日：1997-05-27
申请人： YANO GIKEN KK , KUBOTA KK
发明人： YANO MASATOSHI , KAKEHASHI KOICHIRO , UJIIE MITSUHARU
IPC分类号： F16L15/04 , F16L9/12
摘要： PROBLEM TO BE SOLVED: To prevent breakage of the joint of a line and to improve connection reliability. SOLUTION: The screw heights H of a male screw part 18 formed on the outer surface of one end part of a short pipe 12 and a female screw part 24a formed in the inner surface of a socket 24 are set to 5 mm of more. The root diameter ϕD1 of the male screw part 18 is set to a value higher than the outside diameter ϕD2 of a short pipe 12. Further, a screw coupling length L when the male screw part 18 is joined in a screwed-in state with the female screw part 24a of a socket 24 is set to a value higher than a value two times or more as large as the thickness T of the short pipe 12. In which case, the tensile and compression strength of a joining part between the short pipe 12 and the socket 24 is increased to a value higher than that of the short pipe 12.

9. 发明专利

JPH0320183A MANUFACTURE OF FIBER REINFORCED PLASTIC VALVE BOX FOR BUTTERFLY VALVE 失效
公开(公告)号：JPH0320183A
公开(公告)日：1991-01-29
申请号：JP15324589
申请日：1989-06-15
申请人： KUBOTA KK
发明人： KAKEHASHI KOICHIRO
IPC分类号： F16K27/02 , B29C43/02 , B29K105/06 , B29L31/00
摘要： PURPOSE:To improve strength of a hole peripheral part for a valve stem by setting up each cloth impregnated with a thermosetting resin material before its press forming, in a position equivalent to the circumference of the valve stem hole. CONSTITUTION:Prior to press forming, each cloth 7 impregnated with a thermosetting resin material is set up in a position equivalent to the surroundings of valve stem holes 4, 5 in an inner surface of at least a valve box 1 whereby the cloth 8 is solidly formed an and around these valve stem holes 4, 5 in the valve box inner surface. When the valve box 1 suchlike is actually used, even if stress concentration is produced in each peripheral part of these valve stem holes 4, 5 by what water pressure acts on a valve stem 3, since the cloth 8 is solidly formed on an inner surface of the valve box in respective peripheral parts of the valve stem hole 4, 5 being in a most dangerous state or a possible cause of crack occurrence, any occurrence of a crack or the like is obviable owing to reinforcement action to a two-dimensional direction at valve stem shaft center directional view most efficiently and effectively.

10. 发明专利

JP2002005356A DETACHMENT PREVENTIVE METAL FITTING 失效
公开(公告)号：JP2002005356A
公开(公告)日：2002-01-09
申请号：JP2000192403
申请日：2000-06-27
申请人： KUBOTA KK
发明人： NAKAMURA AKIRA , KAKEHASHI KOICHIRO
IPC分类号： F16L21/08 , F16L27/12
摘要： PROBLEM TO BE SOLVED: To eliminate a possibility of damage to a socket pipe and generation of a crack due to fatigue and to improve durability of a pipe. SOLUTION: When thrust load due to water pressure and external force due to ground displacement such as an earthquake are applied as extracting force to a pipe coupling part, an insertion pipe 16 is drawn from the socket pipe 12. When an insertion pipe 16 is drawn by a prescribed length, an insertion saddle 26 is locked by an arm 28 and the arm 28 is pulled in an extracting direction. Since the arm 28 is locked by the socket saddle 24, force displaced in the extracting direction is applied to the socket saddle 24 and the socket saddle 24 is locked by a tapered external surface 18 of the socket pipe 12. At this time, force is applied from the socket saddle 24 to the tapered external surface 18 and the force is mitigated by a buffer material 34 provided on a tapered internal surface 32 of the socket saddle 24. Therefore, stress concentration is not generated on the tapered external surface 18 of socket pipe 15.

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