Patent ID: 6155613
Filing Date: 2000-12-05
Classification: F16L,Y10S

Abstract:
A pipe joint, comprising:a sleeve including a sleeve end face and an internal threaded section having sleeve thread teeth, said threaded section terminating at a sleeve thread end position located a first distance from said sleeve end face so that said sleeve has an internal unthreaded section between said end of said sleeve and said sleeve thread end position; anda spigot including a spigot end face and an external threaded section having spigot thread teeth and for threaded engagement with said sleeve thread teeth to provide a threaded connection between said sleeve and spigot for forming said pipe joint, said external threaded section terminating at a spigot thread end position located at a second position from said spigot end face so that said spigot has an external unthreaded section between said end face of said spigot and said spigot thread end position;said sleeve thread teeth defining guide flanks and load flanks and sleeve thread gaps and a constant first lead between adjacent ones of said guide flanks;said spigot thread teeth defining guide flanks and load flanks and spigot thread gaps and a constant second lead between adjacent ones of said spigot teeth guide flanks, said second lead being smaller than said first lead by a predetermined difference and said spigot thread gaps being wider than said sleeve thread teeth by approximately said predetermined difference, said spigot guide flanks facing said sleeve guide flanks and said spigot load flanks facing said sleeve load flanks when said sleeve internal threaded section and said spigot external threaded section are threadedly connected to form said pipe joint, wherein said predetermined difference between said first lead and said second lead causes said guide flanks at said sleeve thread end position to be braced against said load flanks at said spigot thread end position to provide maximized bracing proximate terminating ends of said threadedly connected internal and external threaded sections and decreased bracing toward central portions between said terminating ends of said threadedly connected internal and external threaded sections.