Patent ID: 7494161
Filing Date: 2009-02-24
Classification: F01N,F02M,F16L

Abstract:
1. A coming off preventing device for a joining part of an air supply and exhaust pipe arrangement comprising first and second air supply and exhaust pipes being joined by inserting an entry end of an entry of said first air supply and exhaust pipe into a socket of said second air supply and exhaust pipe, and said coming off preventing device comprising a cut out window provided at a socket side of said second air supply and exhaust pipe, and a metal stopper provided at an outer side of the cut out window, said metal stopper having a lock unit comprising first and second ends, a center part, a push part on an upper surface of said first end, a rectangular shaped lock part on a lower surface of said second end, and a bearing part on an upper surface of said center part, said lower surface of said lock unit having one end of a plate spring welded thereto, said plate spring being bent to have an obtuse angle to bias said lock part into said cut out window, a joint cover being provided which covers said lock unit and rotatably supports said lock unit by said bearing part so as to fix said lock unit in an axial position relative to said joint cover and said second air supply and exhaust pipe, a circumferential groove being provided on an entry side of said first air supply and exhaust pipe which stops coming off by receiving the rectangular shaped lock part of said lock unit in said groove, said groove being formed in said entry in the opposite direction to the entry end and between said entry end and an entry stopper which cooperates with said socket to limit insertion of said entry into said socket.