Patent ID: 6016843
Filing Date: 2000-01-25
Classification: B21D,F16L,Y10T

Abstract:
A flanged pipe unit comprising:a metal pipe including:a larger expanded portion, a smaller expanded portion and a raised portion which are axially aligned so that said smaller expanded portion is located between said larger expanded portion and said raised portion;a first part extending axially outward in one direction from said larger expanded portion of said pipe; anda second part extending axially outward in an other direction from said raised portion of said pipe; anda metal flange having a through bore through which said pipe passes, said through bore including a larger diameter portion, a smaller diameter portion, and a tapered end portion which are axially aligned, with said smaller diameter portion located between said larger diameter portion and said tapered end portion,wherein said larger expanded portion, said smaller expanded portion, and said raised portion of the pipe are intimately engaged with said larger diameter portion, said smaller diameter portion, and said tapered end portion of the through bore, respectively, to establish a dove-tail coupling between said pipe and said flange,wherein the first part extends beyond one side of the flange and the second part extends beyond the other side of the flange, andwherein said larger and smaller expanded portions of said pipe are produced by radially expanding given portions of said pipe, and said raised portion is produced by axially compressing a given portion of said pipe.