Pipe joints or couplings – Particular interface – Annular socket
Reexamination Certificate
2006-01-31
2006-01-31
Nicholson, Eric K. (Department: 3679)
Pipe joints or couplings
Particular interface
Annular socket
C285S423000, C285S354000
Reexamination Certificate
active
06991266
ABSTRACT:
The invention provides a pipe joint made of resin in which a predetermined pressing force in the axial direction corresponding to a fastening torque of a union nut can be obtained, and the strength of threads can be enhanced. Each of the threads of an external thread portion of a joint body and an internal thread portion of a union nut is formed asd an asymmetrical trapezoid, an inclined angle α1of first flanks of the asymmetrical trapezoidal threads which contact with each other by fastening the union nut is set to 70 to 90°, and an included angle α2of the flanks opposite to the first flanks is set to 40 to 80°, and wherein the joint body defines a sealing portion the angle and direction of taper of which is defined by an angle θ0, said external thread is defined by an angle θ1, where θ1=α1and wherein θ0<θ1and |cos θ0|>|cos θ1|.
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Bacon & Thomas
Nicholson Eric K.
Nippon Pillar Packing Co. Ltd.
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