To easily form a projected part without degrading the strength of a spigot even when an opening is made in a resin pipe.
A toothed ring 26 having a biting tooth 26a and a pressing ring 28 on which a second tapered surface 28a to be abutted on the outer surface of the toothed ring 26 is formed, are arranged on an outer surface of a spigot 16. When the force of detachment from a socket 14 is applied to the spigot 16, the pressing ring 28 is engaged with a lock ring 22, the toothed ring 26 pressed against the second tapered surface 28a of the pressing ring 28 is contracted, and the biting tooth 26a is bitten in the outer surface of the spigot 16 and fixed thereto. The toothed ring 26 and the pressing ring 28 are functioned as a projected part to be engaged with the lock ring 22.
| JPH04101885 | [Title of the device] Secession prevention tube fitting |
| WO/2012/008953 | MOUNTING APPARATUS AND SYSTEM THEREOF |
AKAISHI YORINOBU
YAMADA YOSHIKI
MAKI ATSUSHI
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