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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:
小仲 正純
平田 祥一
吉田 義徳
冨田 直岐
Application Number:
JP2002000095872
Publication Date:
December 06, 2006
Filing Date:
March 29, 2002
Export Citation:
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Assignee:
株式会社栗本鐵工所
International Classes:
F16L21/08; (IPC1-7): F16L21/08
Domestic Patent References:
JP2000304176A
JP51076625A
Attorney, Agent or Firm:
鎌田 文二
東尾 正博
鳥居 和久



 
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