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A separation prevention device for a pipe joint has disengagement prevention members and a press member. The disengagement prevention members are disposed at a plurality of locations in a circumferential direction of the pipe, on an inner peripheral surface of an engaging tool or of a receiving open

A separation prevention device for a pipe joint has disengagement prevention members and a press member. The disengagement prevention members are disposed at a plurality of locations in a circumferential direction of the pipe, on an inner peripheral surface of an engaging tool or of a receiving opening itself and which are formed with claws. The press member presses the disengagement prevention member radially inward of the pipe and which engages the claw with the outer peripheral surface of an inserting opening. The claw of the disengagement prevention member and the claw of the disengagement prevention member which is adjacent to the former disengagement prevention member in the circumferential direction of the pipe are arranged so as to overlap on each other in the axial direction of the pipe in a state where the claws are engaged with the outer peripheral surface of the inserting opening.

대표청구항 ▼

1. A separation prevention method for a pipe joint, that connects a first pipe having a receiving opening and a second pipe having an inserting opening, comprising: fitting an engaging tool over the second pipe, said engaging tool comprising a plurality of disengagement prevention members disposed a

1. A separation prevention method for a pipe joint, that connects a first pipe having a receiving opening and a second pipe having an inserting opening, comprising: fitting an engaging tool over the second pipe, said engaging tool comprising a plurality of disengagement prevention members disposed at a plurality of locations in a circumferential direction, such that claws formed on the disengagement prevention member face an outer peripheral surface of the inserting opening, and a claw of at least one of the disengagement prevention members and a claw of an adjacent disengagement prevention member, which is adjacent in the circumferential direction of the pipe, are arranged so as to overlap each other when viewed in an axial direction of the pipe in a state where the claws are engaged with the outer peripheral surface of the inserting opening;inserting the inserting opening of the second pipe into the receiving opening of the first pipe;engaging the engaging tool with the first pipe; andpressing the disengagement prevention members radially inward of the pipe joint,wherein the disengagement prevention members disposed at the plurality of locations in the circumferential direction of the pipe are accommodated in an annular groove which opens toward the inserting opening in the inner peripheral surface of the engaging tool or the receiving opening itself. 2. The separation prevention method according to claim 1, wherein a contact region of the claw is formed on an entire region of the inserting opening in the circumferential direction of the pipe joint. 3. The separation prevention method according to claim 1, wherein the disengaging prevention member has an inclined surface and said disengagement prevention member is pressed on the inclined surface, whereby the disengagement prevention member is pressed radially inward of the pipe joint by wedge effect so as to enhance an engagement effect caused by the claws, when an external force separating the first pipe and the second pipe from each other in the axial direction of the pipe joint is applied. 4. A separation prevention method for a pipe joint, that connects a first pipe having a receiving opening and a second pipe having a inserting opening, comprising: inserting the inserting opening of the second pipe into the receiving opening of the first pipe, said first pipe comprising a plurality of disengagement prevention members disposed at a plurality of locations in a circumferential direction, such that claws formed on the disengagement prevention member face an outer peripheral surface of the inserting opening, and a claw of at least one the disengagement prevention members and a claw of an adjacent disengagement prevention member, which is adjacent in the circumferential direction of the pipe, are arranged so as to overlap each other when viewed in an axial direction of the pipe in a state where the claws are engaged with the outer peripheral surface of the inserting opening; andpressing the disengagement prevention members radially inward of the pipe joint,wherein the first pipe comprise an annular groove on the inner peripheral surface at the receiving opening which opens in a direction radially inward of the first pipe, and the disengagement preventers are disposed at the plurality of locations therein. 5. The separation prevention method according to claim 4, wherein a contact region of the claw is formed on an entire region of the inserting opening in the circumferential direction of the pipe joint. 6. The separation prevention method according to claim 4, wherein the disengaging prevention member has an inclined surface and said disengagement prevention member is pressed on the inclined surface, whereby the disengagement prevention member is pressed radially inward of the pipe joint by wedge effect so as to enhance an engagement effect caused by the claws, when an external force separating the first pipe and the second pipe from each other in the axial direction of the pipe joint is applied. 7. A plurality of disengagement prevention members which are disposed at a plurality of locations in a circumferential direction of a pipe, each disengagement prevention member comprising a claw capable of biting into an outer peripheral surface of the pipe, wherein the claw of at least one of the disengagement prevention members and a claw of an adjacent disengagement prevention member, which is adjacent in the circumferential direction of the pipe, are arranged so as to overlap each other to form an overlapped portion when viewed in an axial direction of the pipe in a state where the claws are engaged with the outer peripheral surface of the pipe, wherein portions of both ends of the inner peripheral surface of each of the disengagement prevention members in the circumferential direction of the pipe where the claws are formed are provided substantially in parallel to the axial direction of the pipe. 8. A plurality of the disengagement prevention members according to claim 7, wherein the overlapped portion in which the claws are overlapped with each other viewed in the axial direction of the pipe is formed at all of locations where the disengagement prevention members are adjacent to each other in the circumferential direction of the pipe. 9. A plurality of the disengagement prevention members according to claim 7, wherein two of the claws extending in the circumferential direction of the pipe are formed on an inner peripheral surface of each of the disengagement prevention members, and one of the claws is disposed at a distance from the other claw in the axial direction of the pipe and whose both ends are deviated in position in the circumferential direction of the pipe.