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Title:
MECHANICAL JOINT
Document Type and Number:
Japanese Patent JPH02309086
Kind Code:
A
Abstract:

PURPOSE: To easily connect a pipe by inserting an in-core, which is inserted into a joint main body and a pipe and made of a shape memory alloy and expanded in diameter by heating or cooling, into the pipe, and heating or cooling it.

CONSTITUTION: A groove 16 buried with an O-ring 18 is formed on the connection face 14 of a pipe 20 to a joint main body 12. A nearly cylindrical in-core 22 is inserted in the pipe 20 of the connection face 14 in advance. The in-core 22 is formed with a thin plate made of a unidirectional shape memory alloy, for example, a stopper 24 preventing the insertion into the pipe 20 is formed at one end, and a slant slit 26 facilitating the shape change in the shrinkage or expansion direction is provided on the side face. The in-core 22 is heated and expanded in diameter by being passed in hot water. As a result, piping can be performed in a narrow space, and the reduction of water-tightness due to unsatisfactory construction can be prevented.


Inventors:
HIRAOKA HIROFUMI
Application Number:
JP12947089A
Publication Date:
December 25, 1990
Filing Date:
May 23, 1989
Export Citation:
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Assignee:
KUBOTA KK
International Classes:
F16L13/00; F16L13/14; (IPC1-7): F16L13/00; F16L13/14
Attorney, Agent or Firm:
Yoshito Yamada



 
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