Abstract: A method of forming a dual tube conduit having a predetermined outer tube dimension, a predetermined inner tube dimension, and a predetermined gap between the tubes. A dual tube workpiece may be initially bent in one or more zones to a desired nonlinear configuration, the inner and outer tubes are hydroform expanded simultaneously to obtain the selected inner tube dimension, and the outer tube is then hydroform expanded to the desired outer tube dimension and to the desired gap therebetween, while the inner tube is held constant.

Abstract: An injection line connection for internal combustion engines having for each pressure connection a connecting fitting which hitherto was upset out of the material of the injection line but which is still defective and which can be pressed by a cap nut, by way of a pressure ring, against an internal taper portion of a connecting member which carries the cap nut, is also suitable for thinner injection lines, free of disadvantages, by virtue of the following features, some of which are known and which are reproduced here by way of abstract:(a) the injection line (1) is a wall thickness in the range of from 1/5 to 1/3 of its outside diameter (D);(b) each pressure ring (6) is provided with a support projection (10) which is rounded off at the end towards the connecting fitting and which is of a tapered configuration along its outside periphery, while the associated connecting fitting (3) comprises the end of the injection line (1) which is flanged over outwardly about the support projection (10) and there forms th

Abstract: An orifice fitting for a gas pressure differential-measuring system is constructed of a fabricated body. In the fabrication, two lengths of flared or flanged pipe are inserted through the internal bores of respective orifice blocks and circumferentially welded on the outside. A U-member, which may be assembled of three straight pieces, is welded between the two blocks joining them and leaving a slot at the top. An orifice holder dependingly secured to a cover is provided with an orifice plate rimmed within a gasket and inserted through the slot. The cover is removably, sealingly mounted on the body. The outer face of the upstream face of the gasket is radially notched to equalize pressure in the orifice chamber.

Abstract: Collar sleeves lined with bearing material are manufactured by axially upsetting a prepared cylindrical sleeve in a die assembly tool that permits and controls axial thickening of the sleeve wall in the region of the desired collar.

Abstract: The method is performed on a cylinder having at least one end opening for receiving a flange forming tool. An annular shoulder is formed extending from the outside of the cylinder substantially perpendicular to the axis of the cylinder. Also, an annular extension is provided on the cylinder having an outside surface extending from the inside of the annular shoulder to the end of the cylinder. The length of the outside surface is formed to be greater than the radial width of the annular shoulder. A flange forming tool is then applied against the free end of the annular extension to move the annular extension until its formerly outside surface is against the annular shoulder to provide an end flange extending substantially perpendicularly to the axis of the cylinder.