| 摘要 |
A pipe coupling of the type comprising a body member A, a nut member B screwing onto the body member A, and front and rear ferrules C, D for mounting on a pipe between the body and nut members, has a convexly tapering leading end 5 of the front ferrule C contacting a straight tapered converging wall 2 in the body member A, a convexly tapering leading end 7 of the rear ferrule D contacting a straight tapered mouth 6 in the trailing end of the front ferrule C, and a convexly tapering trailing end 8 of the rear ferrule D contacting a straight bevel 9 in the inner end of the nut member. The angle of the converging wall 2 in the body member is between 12 DEG and 20 DEG to the axis, preferably 15 DEG , the angle of the tapering mouth 6 in the front ferrule is 45 DEG to the axis, and the angle of the bevel 9 in the nut member is between 75 DEG and 80 DEG to the axis, preferably 77 DEG . The front ferrule is thickened around the tapering mouth, being stepped up from the larger end of the leading end, which curves to a flat annular front end face the inner edge of which bites into an inserted pipe. The rear ferrule is stepped up between the larger end of the leading end and the larger end of the trailing end, and the leading end curves to an edge which bites into an inserted pipe. <IMAGE> |
