Fitting, ferrule, and ferrule manufacturing method

A fitting to be connected to a pipe, comprising:

• a first member having a through hole constructed and arranged to receive the pipe;
• a second member having a through hole constructed and arranged to receive the pipe, the second member being coupled by screw coupling with the first member, with a central axis of the through hole being aligned with a central axis of the through hole of the first member;
• and
• a ferrule having a through hole extending from a first end portion of the ferrule to a second end portion of the ferrule constructed and arranged to receive the pipe, the ferrule including a portion having a greater inner diameter than the first end portion and the second end portion between the first end portion and the second end portion, and the ferrule being placed in an accommodation space formed by an inner circumferential surface of the first member and an inner circumferential surface of the second member, with a central axis of the through hole being aligned with the central axes of the first member and the second member, wherein
• the ferrule includes a rising portion including the first end portion, a pressed portion located closer to the second end portion than the rising portion, and an intermediate portion including a portion where an inner diameter is greater than the first end portion and the second end portion, the intermediate portion connecting together the rising portion and the pressed portion;
• the first member includes a first tapered inner circumferential surface having a tapered shape, constructed and arranged to be in contact with the first end portion of the ferrule;
• the second member includes a pressing portion for pressing at least a portion of the pressed portion of the ferrule;
• the accommodation space includes a first clearance space constructed and arranged to accommodate the ferrule therein and to allow the rising portion to rise so as to increase an angle of the rising portion with respect to the outer circumferential surface of the pipe;
• and
• as the screw coupling between the first member and the second member is tightened, the rising portion of the ferrule rises with an outer circumference of the first end portion serving as a fulcrum of the principle of leverage and an inner circumference of the first end portion serving as a point of load of the principle of leverage, causing the inner circumference of the first end portion to rotate to be driven to bite into an outer circumference of the pipe.