Patents Assigned to Waterworks Technology Development Organization
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Patent number: 6305426Abstract: An expansion tube joint of the present invention comprises a first cylindrical body, a second cylindrical body inserted along an axis of the first cylindrical body, a seal member mounted between the first and second cylindrical bodies closer to an insertion port of the first cylindrical body, a lock mechanism provided at a position deeper than the seal member for restricting a relative movement range along the axis of the first and second cylindrical bodies, and a coming-out preventing member for preventing the seal member from coming out from the insertion port of the first cylindrical body, wherein after a member constituting the lock mechanism is mounted, the seal member can be mounted.Type: GrantFiled: September 9, 1999Date of Patent: October 23, 2001Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Publication number: 20010024037Abstract: A flexible pipe joint apparatus for use in a fluid (e.g., water) transport pipe system for maximally absorbing an external force such as a compression or tensile force applied to a pipe of the fluid transport system due to an earthquake, differential settlement, thermal expansion or contraction of the pipe per se, thus preventing resultant damage at a weak portion of the pipe. The apparatus includes a receiving tubular member and an inserting tubular member insertable into and connectable with the receiving tubular member along a tube axial direction. A stopper portion is formed in an outer peripheral face of the inserting tubular member, the stopper portion projecting radially outward from the outer peripheral face.Type: ApplicationFiled: March 16, 2001Publication date: September 27, 2001Applicant: WATERWORKS TECHNOLOGY DEVELOPMENT ORGANIZATION., LTD.Inventors: Hideki Yoneyama, Akihito Totsugi
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Patent number: 6250690Abstract: An expansion flexible tube joint comprising a first cylindrical body having a pair of spherical surface ring materials each formed with partially spherical outer surface, a second cylindrical body comprising a sleeve inserted into the first cylindrical body for relative movement thereof from an axial direction thereof, the sleeve provided at its end portion with stopper means for limiting extending and contracting movement relative to the first cylindrical body, and third cylindrical bodies fitted over both outer peripheral surfaces and comprising a pair of casing tubes each having slidable spherical inner peripheral surfaces and connection portions at opposite ends thereof, wherein an end inner peripheral surface of each of third cylindrical bodies at the thereof to which second cylindrical body is inserted is chamfered, and the chamfered angle is 16° or greater, and the stopper means is mounted to an outer peripheral surface of the second cylindrical body and is formed into a closed ring shape.Type: GrantFiled: August 26, 1999Date of Patent: June 26, 2001Assignee: Waterworks Technology Development Organization Co., Ltd.Inventor: Kosuke Sakai
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Patent number: 6203073Abstract: A tube joint comprises: a pushing ring provided at its outer periphery with a projection and fitted to an outer periphery of one end of a joint tube; a tube or a joint body provided at is side opposed to the pushing ring with a projection opposed to the projection of the pushing ring, the tube or the joint body having a receiving portion which is widened toward the pushing ring and the tube or the joint body being fitted to an outer periphery of the joint tube with a peripheral gap left therebetween; a fastening tool capable of moving the pushing ring in a direction of the tube or the joint body; a packing provided between inner and outer side of the tube or the joint body and the joint tube, and fitted through the receiving portion by its own resilient deformation by operation of the fastening tool; and a spacer inserted between the pushing ring and the tube or the joint body to limit a distance between the pushing ring and the tube or the joint body to a constant value.Type: GrantFiled: September 9, 1999Date of Patent: March 20, 2001Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Koichi Shirakawa, Kosuke Sakai
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Patent number: 6161878Abstract: An external cover pipe is adapted to be fixedly fitted over a fluid transport pipe made of synthetic resin via an elastic seal. The cover pipe includes a plurality of split pipe members divided in the peripheral direction of the pipe which cooperate to compress the elastic seal in association with a fastening operation of a fastener for fastening and joining together the split pipe members disposed adjacent each other in the peripheral direction. Each split pipe member includes, in an inner peripheral face thereof, a deformation limiting face for coming into contact with an outer peripheral face of the fluid transport pipe in association with the fastening operation of the fastener so as to limit radial deformation of the fluid transport pipe. This deformation limiting face is provided at a portion in the inner peripheral face of the split pipe member located at a position axially offset toward an extreme axial end of the external cover pipe away from a portion thereof where the elastic seal is attached.Type: GrantFiled: August 26, 1998Date of Patent: December 19, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Kazuhiro Atsumi, Kikuo Saito, Yasushi Shimonaka, Tamotsu Maenishi
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Patent number: 6131957Abstract: A construction for fixing a pipe joint is disclosed. The construction includes a pipe joint body within which a fluid transport pipe is connected and engaged in a sealed state via an elastic seal, a press ring fitted on the fluid transport pipe, the press ring being peripherally divided to provide a plurality of press-ring segments, a fastener for fasting each press-ring segment to a connecting portion of the pipe joint body along a pipe axis direction, and a retainer member interposed between an outer peripheral face of the fluid transport pipe and an inner peripheral face of the press ring, the retainer member being capable of radially biting into the outer peripheral face of the fluid transport pipe. A cam surface formed in the inner peripheral face of the press ring is operable to reduce the retainer member radially with a relative movement between the pipe joint body and the press ring along the pipe axis direction in association with a fastening operation by the fastener.Type: GrantFiled: March 17, 1999Date of Patent: October 17, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Kikuo Saito, Tamotsu Maenishi
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Patent number: 6056329Abstract: A telescopic pivotal pipe joint for use in a fluid transporting pipe system such as water transporting pipe system installed under the ground is disclosed. The joint has a first pipe member including a semi-spherical inner peripheral face, a second pipe member including a semi-spherical pipe portion projecting radially outward and sidable along the semi-spherical inner peripheral face of the first pipe member, the second pipe member being slidably engaged within the first pipe member, and a third pipe member telescopically sidable in an axial direction and engaged on a straight pipe portion co-extensive with the semi-spherical pipe portion of the second pipe member. The semi-spherical pipe portion of the second pipe member defines an annular groove, into which one end of the third pipe member comes into engagement along the axial direction when the second pipe member and the third pipe member are contracted maximally relative to each other.Type: GrantFiled: April 1, 1998Date of Patent: May 2, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Kenji Kitani, Shintaro Suzuki, Kosuke Sakai
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Patent number: D453552Type: GrantFiled: April 4, 2000Date of Patent: February 12, 2002Assignee: Waterworks Technology Development Organization, Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D424916Type: GrantFiled: October 1, 1999Date of Patent: May 16, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D424917Type: GrantFiled: October 1, 1999Date of Patent: May 16, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D424918Type: GrantFiled: October 1, 1999Date of Patent: May 16, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D425406Type: GrantFiled: October 1, 1999Date of Patent: May 23, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D425782Type: GrantFiled: October 1, 1999Date of Patent: May 30, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D426143Type: GrantFiled: October 1, 1999Date of Patent: June 6, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D426144Type: GrantFiled: October 1, 1999Date of Patent: June 6, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D426455Type: GrantFiled: October 1, 1999Date of Patent: June 13, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D426457Type: GrantFiled: October 1, 1999Date of Patent: June 13, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D427508Type: GrantFiled: September 10, 1999Date of Patent: July 4, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D428805Type: GrantFiled: October 1, 1999Date of Patent: August 1, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita
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Patent number: D429145Type: GrantFiled: September 10, 1999Date of Patent: August 8, 2000Assignee: Waterworks Technology Development Organization Co., Ltd.Inventors: Taichi Sato, Yasushi Fujita