A clamping ring for use in pipe joints has an inside surface which is formed with generally peripherally extending indentations for axially fixing a pipe. In order to prevent an occurrence of dangerous stress concentrations in pipes in contact with such clamping rings and to permit such rings to be manufactured economically, the clamping ring is formed on its inside surface with a multiplicity of generally peripherally extending indentations, each of which extends only along part of the periphery of said inside surface, and said indentations are offset from each other in said peripheral directions and adjoin or overlap.

A system for assembling a high-pressure fluid tube on a tubular pin, is part of a fitting element provided to be used in particular on motor-vehicles, for example for the production of pipes intended for manufacturing braking circuits or other circuits, in which high-pressure oil or other fluids flow. The system has a first inner layer made of plastic, a second layer made of a steel plait or other suitable material such as fibers or the like, a third coating layer of plastic material and a bush made of steel, alloy or other material, fitted into an end of the tube. The tube is fitted on the pin and locked by crimping of a metallic bush having a radial flange extending into an annular groove of the pin and distorting an O-ring in the groove between the flange and the pin.

A hose construction for conveying water under pressure, a stem therefor and methods of making the same are provided, the hose construction comprising a flexible tubular hose having opposed ends, a metallic stem having opposed ends and having one of the ends thereof disposed in one of the ends of the hose, and a metallic tubular ferrule telescoped on the one end of the hose and being radially inwardly crimped toward the stem to compress the end of the hose between the ferrule and the stem, the one end of the stem having a plurality of annular spaced apart projections thereon and respectively having external peripheral surfaces embedded into the one end of the hose, the stem having an opening passing therethrough and defining an internal peripheral surface thereof, the one end of the stem terminating at an end edge thereof that is defined by the internal peripheral surface joining with the external peripheral surface of an adjacent annular projection the end edge defining a relatively large rounded end part on the stem that prevents the end part of the stem from being razored by water flow and from cutting into the hose when the hose is being bent relative to the stem adjacent the end part thereof.

The invention pertains to a hose fitting particularly suitable with hose having a helical convoluted inner tube, and wherein the hose is formed of a synthetic plastic material. The fitting includes a tubular nipple having a helical projection upon which the hose inner tube is threaded, and a socket crimped upon the hose supported upon the nipple includes serrations for compressing the hose at predetermined locations. The nipple configuration aids in maintaining the hose upon the nipple in a fluid tight manner, and a socket tang receiving groove defined in the nipple axially maintains the socket in predetermined relationship to the nipple.

Two substantially similar metal parts are connected by forming a male configuration at the end of the first metal part forming a complementary female configuration at the end of the second substantially similar metal part; flaring the female configurated end of the first part to accept the male configurated end of the second part; positioning the two parts so that they are disposed female end to male end, and also so that they are axially aligned; inserting the male configurated end of the first part into the female configurated end of the second part, while maintaining axial alignment of the parts, whereby the two configurated ends are releasably engaged; and, squeezing the flared female end, whereby the two configurated ends are mated. As a result, a positive, permanent, and interlocking joint is formed, and the two substantially similar metal parts are permanently and reliably connected inexpensively, simply, and quickly. This method is exceptionally well-suited for use during the manufacture of a spherical bomblet, which comprises two similar metal hemispheres which are filled with explosive, in connecting the respective free and open end of each of the two similar and explosive-filled metal hemispheres, and thereby preventing the pinching, and the subsequent inadvertent and unintended detonating, of the explosive.