Patent ID: 6435569
Filing Date: 2002-08-20
Classification: F16L

Abstract:
Pipe connecting structure comprising: a first pipe having a female end including an annular flange at the outer end thereof, a first internal inwardly tapered annular surface on said annular flange, a second internal inwardly tapered annular surface spaced axially inward from the first internal annular surface, a continuous internal thread extended between the first and second internal surfaces, a second pipe having a male end of a size to fit into the female end of the first pipe, said male end having a sleeve at the outer end thereof, said sleeve having a first external surface with a size and taper for surface engagement with the second internal surface, a second external surface spaced axially inward from the first external annular surface, said second external surface having a size and taper for surface engagement with the first internal surface, a continuous external thread extended between the first and second outer annular surfaces, said internal and external threads have the same taper as said annular surfaces, and said external thread being complementary to the internal thread whereby when the internal and external threads fully engage each other the adjacent internal and external tapered annular surfaces are in surface engagement with each other.