Title:
LOCK RING DIAMETER-EXPANSION RETAINING METHOD AND DEVICE FOR PIPE JOINT
Document Type and Number:
Japanese Patent JP3853242
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a diameter-expansion retaining method fulfilling a function of retaining diameter-expansion of a lock ring during joining operation of a joint, having a feature of losing the diameter-expansion retaining function after completion of the joining of the joint, and unnecessary to be removed even after the completion of the joining of the joint.
SOLUTION: The method is for the pipe joint adapted to have a retaining condition with the lock ring 5 and a projection 8 by receiving the one-split lock ring 5 via a centering rubber 4 in a lock ring groove 3 formed in an inner peripheral surface of a socket 2 and by inserting an insert 7 with the projection 8 at an end into the socket 2 and is for retaining the lock ring 5 to be used with the pipe joint in a diameter-expansion condition. The diameter-expansion condition is retained by interposing a spacer 24 formed of ice transforming from solid with time between extended opposite ends of the lock ring 5, and the lock ring 5 is returned to an original diameter through melting of the ice spacer 24 with the lapse of time.
Inventors:
Masazumi Konaka
Shoichi Hirata
Yoshinori Yoshida
Naoki Tomita
Shoichi Hirata
Yoshinori Yoshida
Naoki Tomita
Application Number:
JP2002095872A
Publication Date:
December 06, 2006
Filing Date:
March 29, 2002
Export Citation:
Assignee:
Kurimoto Iron Works Co., Ltd.
International Classes:
F16L21/08; (IPC1-7): F16L21/08
Domestic Patent References:
| JP2000304176A | ||||
| JP51076625A |
Attorney, Agent or Firm:
Bunji Kamada
Higashio Masahiro
Torii Kazuhisa
Higashio Masahiro
Torii Kazuhisa