Separable connecting devices, especially for components of tubular braces

Claim 1

Joint comprising a threaded sleeve and two elongated members having threaded end portions which abut each other when connected by said sleeve, the threads on each end portion being cylindrical and having at least those flanks facing away from the ends of said elongated members perpendicular to the axis of said joint; the depth of the threads on said end portions increasing progressively toward the end of said members until they reach a depth which remains Constant for at least part of the remainder of said end portions, and the crests of each of the threads of increasing and constant depth lying in the locus of a cylinder; said sleeve having two cylindrically threaded sections in which at least those flanks facing away from the ends of said sleeve are perpendicular to the axis of said joint, with the threads in each section progressively increasing in height from the end of said sleeve until they reach a height which remains constant over at least part of the rest of said section, and the roots of each of said threads of increasing depth and constant depth lying in a cylindrical locus; the threads of increasing depth on said elongated members being screwed into said threads of increasing height on said sleeve, and the threads of constant depth on said elongated members being screwed into said threads of constant height on said sleeve, so that the flanks of the threads on said elongated member which are perpendicular to the axis of said joint are in contact with the flanks of the threads on the sleeve which are perpendicular to the axis of said joint, but a clearance is left between the crests of said threads and the bottoms of the grooves in which said threads engage.