Patent ID: 6302148
Filing Date: 2001-10-16
Classification: F16L,Y10T

Abstract:
A coupling device for communicating flow passages with each other by connecting the flow passages to each other, comprising:a plug provided with a main flow passage and a sub flow passage;a socket, which is provided with a main flow passage and a sub flow passage, and which is able to be fitted together with the plug at an arbitrary angle of torsion, and which forms an annular flow passage with the plug when fitted together with the plug, wherein,when the plug and socket are fitted together, the main flow passage on the plug side and the main flow passage on the socket side communicate with each other, and the sub flow passage on the plug side and the sub flow passage on the socket side communicate with each other via the annular flow passage; andthe main flow passage is provided in the central portion of the plug and a plurality of the sub flow passages are provided surrounding the main flow passage.