Patent ID: 6585299
Filing Date: 2003-07-01
Classification: F16L

Abstract:
A pipe joint comprising: a sleeve element which has an internal thread; and a spigot element which has an external thread which can be screwed into said internal thread, a first one of the elements having a constant pitch throughout and a second one of the elements having more than two sections with a pitch which is constant within the section but has a difference from the pitch of the first element, the pitch difference at least of one of the sections being opposite in sign to a remainder of the sections and the pitch difference of another of the sections being at least double the pitch difference of two sections adjacent the another section, the second element being configured so that when screwed into the internal thread of the first element thread play and thread tolerances are compensated in the double pitch difference section and a load flank of one corner tooth of the double pitch difference section produces a basic bracing with a guide flank of another corner tooth of the section, the two adjacent sections being configured to have load and guide flanks that build up thread bracing until a desired thread torque has been reached,wherein one of the spigot element and the sleeve element has a constant pitch throughout and a respectively other of the spigot element and the sleeve element has four sections with a pitch which is different, the pitch of one section of the four sections of the other element being opposite in sign to three remaining successive sections of the four sections, and a central section of the three successive sections having a pitch difference at least twice that of the adjacent sections.