| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem with a conventional water heater, wherein when fall prevention means for gasket is formed by carrying out special processing on a male pipe side, a connection part structure becomes complicated and the price rises to reach failure in mass-production, and also to solve the problem that when one rib is provided in a radial direction of a male pipe to stop the gasket from falling, the rib is not surely strong enough when the pipe thickness is thin, and the male pipe is apt to be biased around a gasket part as a fulcrum and so on. <P>SOLUTION: In a water heater etc., having a connection structure such that the male pipe with the gasket is inserted into a female pipe and connected, the gasket is held between a bent part provided to a tip end of the male pipe and a plurality of rib aggregates, which are raised in radial directions of ribs to form vertical surfaces so that the ribs may be perpendicular to the pipe. <P>COPYRIGHT: (C)2013,JPO&INPIT |
