Pipe joint

10:

• A pipe joint comprising a joint body (1) that itself includes an extraction preventing tooth part (36) as an integral part that comes into a state of tightly contacting an outer peripheral surface (10A) of a connection target pipe (P) under pressure to generate pipe extraction resistance (Z) in response to threaded movement of a cap nut (2) toward the joint body (1).

11:

• A pipe joint comprising a joint body (1) that itself includes an extraction preventing tooth part (36) as an integral part that comes into a state of tightly contacting an outer peripheral surface (10A) of a connection target pipe (P) under pressure to generate pipe extraction resistance (Z) in response to threaded movement of a cap nut (2) toward the joint body (1), wherein
• the extraction preventing tooth part (36) is formed at a tip of a substantially cylindrical thin part (35) of a projecting shape provided at a tip of the joint body (1),
• the extraction preventing tooth part (36) includes a back tooth (36B) and a front tooth (36F) arranged at a tiny interval (W36), the back tooth (36B) has a trapezoidal or substantially trapezoidal sectional shape with a linear first tip side (41) as an upper side, the front tooth (36F) has a trapezoidal or substantially trapezoidal sectional shape with a linear second tip side (42) as an upper side, and as the cap nut (2) threadedly moves forward, the first tip side (41) of the back tooth (36B) and the second tip side (42) of the front tooth (36F) of the joint body (1) come into a state of tightly contacting the outer peripheral surface (10A) of the connection target pipe (P) under pressure to generate pipe extraction resistance (Z).

13:

• The pipe joint according to claim 11, wherein
• while the back tooth (36B) and the front tooth (36F) are in the state of tightly contacting the outer peripheral surface (10A) of the pipe (P) under pressure, the pipe extraction resistance (Z) is distributed equally to the back tooth (36B) and the front tooth (36F).

14:

• The pipe joint according to claim 11, wherein
• while the substantially cylindrical thin part (35) is in a free state, the first tip side (41) of the back tooth (36B) and the second tip side (42) of the front tooth (36F) are arranged parallel to each other in such a manner that the first tip side (41) is placed radially inwardly from the second tip side (42), and
• a slope angle at a tip of the tapered section (17) with reduced-diameter tip, and the shape and dimension of the tip head (37) are set in such a manner that, in the tightly pressure-contacting state, the second tip side (42) projects further in a radially inward direction than the first tip side (41) or the second tip side (42) and the first tip side (41) are at the same position as viewed in a radial direction.

15:

• The pipe joint according to claim 11, wherein
• the substantially cylindrical thin part (35) with a tip provided with the back tooth (36B) and the front tooth (36F) has a conical cylindrical shape increased in diameter toward the tip.

16:

• The pipe joint according to claim 11, wherein
• a small projection (33) for preventing the substantially cylindrical thin part (35) from being increased in diameter and deformed excessively in a pressure-receiving state is provided at an outer peripheral surface of the substantially cylindrical thin part (35), and the small projection (33) is configured to abut on an inner surface of a hole part (11) of the cap nut (2).

17:

• The pipe joint according to claim 11, wherein
• a back portion (31) of a pipe insertion hole part (28P) of the joint body (1) is formed into a tapered shape with diameter reduced backward and is configured to cause the pipe outer peripheral surface (10A) to contact an inner peripheral surface (27) of the pipe insertion hole part (28P) under pressure in a pipe insertion finished state.

18-39. (canceled)