Expansion nut for T-joint of pipes

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...

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Details

411510, 411913, 403252, F16B 1900, F16B 3704

Patent

active

053102983

ABSTRACT:
Disclosed is a one-piece expansion nut for a T-joint of pipes, including an internal thread hole at the center thereof and a plurality of long expanding pieces and short expanding pieces alternatively disposed around the outer periphery thereof, wherein the outer diameters formed by the long and short expanding pieces the same, but slightly larger than the inner diameter of one pipe to be jointed, upon putting the expansion nut into the pipe and passing a bolt through another pipe to screw onto the internal thread hole for a T-joint, the long and short expanding pieces being respectively expanded to exert force against the inner wall of the one pipe in two stages, so as to firmly hold the expansion nut in place and effectively complete the T-joint as required. Further, each long expanding piece can, during the manufacturing processes, be further punched to form a catch tab at the inner side of the upper part thereof, making the outer diameter formed by the catch tabs slightly smaller than that formed by the long or short expanding pieces; the catch tabs being expanded as well to exert another force against the inner wall of the one pipe, so as to help complete the T-joint as required more effective.

REFERENCES:
patent: 1083697 (1914-01-01), Neptune
patent: 2640219 (1953-06-01), Becker
patent: 4518293 (1985-05-01), Pleickhardt et al.
patent: 4704059 (1987-11-01), Nakama et al.
patent: 4810144 (1989-03-01), Martelli

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