Abstract: The invention concerns a cylindro-parabolic reflector for focusing solar rays on the focal axis of the cylinder.The reflector comprises modular elements which are assembled by means of tubes which are interengaged strictly in alignment with each other. The complementary male and female ends of the tubes have been formed by the tubes previously having been forcibly engaged into each other. This makes it possible to provide reflectors of substantially perfect parabolic shape, in spite of their substantial length.The invention will be used primarily in the construction of solar steam generating stations.

Abstract: A process for the thermal treatment of wrought products made of an aluminum alloy of the 2000 series comprising by weight from 3.5 to 5% copper, from 0.2 to 1% magnesium, from 0.25 to 1.2% silicon, with a Si to Mg ratio greater than 0.8 comprising solution heat treatment, quenching treatment, ageing and tempering wherein the tempering treatment comprises at least two stages: (1) a main tempering treatment at a temperature higher than 225.degree. C. and lower than 280.degree. C. lasting between 6 seconds and 60 minutes and (2) a complementary tempering treatment at a temperature between 120.degree. and 175.degree. C. lasting between 4 and 192 hours. This process allows the compromise between the mechanical tensile characteristics and the resistance to intercrystalline and stress corrosion to be improved.

Abstract: The invention relates to a method for quickly joining pipes by chamfering the end of a thin pipe, forcefully socket jointing this pipe in a pipe of the same diameter, dismantling the two pipes by traction. The two pipes can thereafter be rejoined easily and quickly by socket-jointing.

Abstract: A method for the production of a composite hollow body formed of aluminum alloys and composed of two layers having differing structure. One layer of the hollow body is intended to operate in contact with a mobile surface and is produced by extruding a mixture of particles of a hypereutectic silicon alloy having fine grains and an addition product. The other layer is selected from among alloys having certain particular properties and has the structure of a cast and wrought product. The present method particularly consists of the step of joining the two layers by coextrusion on a mandrel in an inverse extrusion press. The composite hollow bodies so produced are used in the production of linings for internal combustion engines or for jacks.

Abstract: A process for the spark erosion machining of a workpiece having a cylindrical orifice, formed of any desired cross-section, the invention utilizes an electrode which is moved relative to the workpiece. According to the invention, a first rapid rough shaping pass is performed by descent of the electrode parallel to the generatrices of the orifice. On raising, the electrode is then translated perpendicularly to the generatrices by a distance r and then is lowered at a slower speed and is raised again before performing a circular translation of radius r. The electrode is again lowered and raised, and the operation is repeated n times so as to perform a complete revolution. The present process allows efficient machining of dies for metal extrusion.

Abstract: An aluminum alloy for use in the production of enameled articles or articles subjected to elevated temperature having the following composition (% by weight):______________________________________ Mn 0.9 to 1.5 Si 1.0 to 1.5 Cr 0.05 to 0.2 Mg < 0.2 Cu < 0.2 Fe .gtoreq. 0.4 Ni .gtoreq. 0.05 Fe + Ni + Co 0.8 to 2 ______________________________________remainder aluminum and normal impurities.

Abstract: The invention relates to a process for the thermal treatment of aluminum alloys containing zinc, magnesium and copper as main alloying elements, and the products manufactured by this process and having an average particle diameter of Al-Mg-Cr phase of between 800 A and 1000 A. This process involves carrying out a treatment at high temperature for a sufficiently short period to prevent coalescense into particles which are too large. This treatment is preferably carried out at the homogenization stage for thin products and at the final dissolution stage for thick products. The invention is applied, in particular, to the manufacture of thin or thick sheets for the aeronautical industry.

Abstract: A process for the thermal treatment of thin products made of 7000 series aluminum alloys comprising a solution heat treatment, quenching treatment and a tempering treatment in three stages:pretempering between 100.degree. and 150.degree. C. for 5 minutes to 24 hours;intermediate tempering; and,final tempering between 100.degree. and 160.degree. C. for 2 to 48 hours.Intermediate tempering comprises a rapid rise in temperature to 190.degree. C. followed by a treatment at a temperature .theta.(t) between 190.degree. and 250.degree. C. for a total duration T in such a way that the function: ##EQU1## is comprised between 0.5 and 1.5; and T and t being expressed in seconds and .theta.(t) in .degree.K.This tempering treatment imparts to the products treated both high mechanical characteristics and a high resistance to stress corrosion.

Abstract: The invention relates to balls for sports, for example, a football, consisting of an external wear layer surrounding a bladder which also forms the body of the ball and is made from a powdered or liquid elastomeric resin comprising a polycondensation product of at least one compound of the group consisting of the dicarboxylic acids and esters of the dicarboxylic acids having a molecular weight of less than 300 with a polyalkylene-oxyglycol whose molecular weight is between 400 and 6000, and at least one diol having a molecular weight of less than 250. The external layer, suitably of rubber or leather, is secured directly to the bladder/body by, preferably, a polyurethane-base adhesive.

Abstract: The present invention relates to a novel pedal bin comprising a receptacle forming the actual bin, a jacket adapted to slide along the receptacle, the relative movement of the jacket with respect to the receptacle being controlled by a pedal, a lid hinged to said jacket, and possibly means for returning said lid into closed position after the bin has been opened.

Abstract: A compressor for a refrigerant gas wherein a rotor acts on a rocking plate to effect rocking thereof and reciprocation of pistons in cylinder bores to produce suction and exhaust strokes for refrigerant gas. A lubricant is contained in a sump in the compressor casing and it is atomized and mixed with refrigerant gas which leaks past the pistons. A duct is formed in the casing for conveying the mixture of refrigerant gas and lubricant from the casing under the action of the suction stroke of the pistons. The mixture is delivered at the inlet for refrigerant gas and the total mixture now flows to a separator where the lubricant is separated from the refrigerant gas. The refrigerant gas is then supplied into the cylinder bores during the suction stroke and the lubricant is delivered into a reservoir where it is forceably delivered back into the casing to the sump.

Abstract: This heating apparatus includes an air flow chamber having outer and inner, generally cylindrical and parallel walls within which a combustion chamber is nested. The combustion chamber includes means for burning a fuel and has outer and inner parallel, generally cylindrical heat conducting walls. It is coupled to an exhaust duct which has at least a portion thereof surrounded by the inner wall of the air flow chamber. In one form air is driven by an electric fan through the air flow chamber around the combustion chamber and out to a distribution duct. The fan also blows air into the combustion chamber for combustion of the fuel. In another form, a fan is driven by th combustion exhaust gases thereby propelling air through the air flow chamber and into the combustion chamber via a compressor wheel. Other forms include heat-conductive members placed into contact with the exhaust duct or with the air chamber to further heat the air before it enters the distribution duct.

Abstract: Drawn and hemmed metal parts, such as vehicle body panels, are made from an aluminum based alloy containing 1.5-2.5% copper, 0.5-1.0% magnesium and 0.4-0.8% silicon and in addition may contain up to 0.2% chromium, 0.4% manganese, 0.2% titanium, 0.2% zirconium and 0.5% iron.

Abstract: The method of and apparatus for the production of bars or machine wire from alloys of aluminum or copper by continuous casting of the rough shape in a grooved casting wheel closed by a band or chain and the subsequent steps of rolling and scalping the rough shape in a series of successive operations.