Abstract: A first tube has an end portion with a socket that is tapered by, a frustoconical wall that ends with a radially extending land. A copper brazing ring is disposed on the land. An end portion of a second tube having a knurled surface is press fitted into the socket to provide a coupling assembly. Upon heating the coupling assembly, the copper brazing ring melts and flows through the grooves in the knurled surface to weld the second tube to first tube and to seal the interface therebetween.

Abstract: A metal collar which is used to construct a coupling for a flexible pressure hose includes a plurality of inner annular beads which are formed by a single stamping operation. Each inner bead is formed to define an annular flat surface facing one end of the collar, and which assists in gripping the hose end. When formed, the collar will also include a plurality of corresponding outer annular grooves opposite the inner annular beads. The stamping operation is performed by a forming apparatus which includes a collapsible, segmented outer die assembly and a coaxially positioned expandable inner die assembly. Due to the segmented construction of the die assemblies, the annular flat surfaces of each of the beads are not continuous, but are formed with a plurality of circumferentially spaced interruptions.

Abstract: A metallic hose coupling assembly provides an improved coupling insert for flexible elastomeric hose. The insert contains a series of external barbs defined by repeating asymmetrical axially inversely oriented pairs of frustoconical segments spaced apart by and contiguous with cylindrical segments positioned therebetween. Each mated pair of frustoconical segments interfaces with a cylindrical segment in a manner which defines rounded interface edges having radii which fall within a range of 15 to 25 thousandths of an inch. The latter configuration of barb provides an effective means of preventing fracture of elastomer hose ends when subjected to relatively high pressure hydraulic applications.