PURPOSE: To obtain a constant insertion rate of a pipe and an excellent watertightness by providing a coupling main body in which an elastic substance layer is provided along the inner wall surface of a groove, and a holding means to hold the peripheral surface of the pipe and to prevent a removal from the groove, which can be released freely, in a U-shape section of groove where the end of the pipe is inserted.
CONSTITUTION: A coupling 1a has a coupling main body 2 and a housing 3 which has a grasping means. The coupling main body 2 is made by forming a synthetic resin pipe 22 in a metal pipe 21. In the synthetic resin pipe 22, a U-shape section of groove 23 to which a pipe 4 is inserted is formed in a ring form, and an elastic substance layer 24 is provided on the inner wall surface of the groove 23. In the housing 3, a pawl 34 as a grasping means which is fitted to a projection line 25 of the metal pipe 21 and prevents the pipe 4 from removing from the coupling 1 by a fluid pressure is formed. As a result, the coupling is contacted closely to the inner surface and the end surface of the pipe, the water preventive property and the anticorrosive property of the pipe end are increased, and a removal of the pipe from the coupling main body can be prevented.
UBAGAI TSUTOMU
YOSHIKAWA HIDEYO
