Abstract: A pinion 9 attached to a door meshes with two parallel racks 10, 11 which face each other. A piston 14, connected by rods 29 to a rotatable lever 25 of a restoration assembly 4 which has a return spring 26 and a shock absorber 27, has an L-shaped pivotable hook 21 behind which a pin 12 of one of the two racks catches at the beginning of the opening. At the end of the closing, immobile stop 17 raises hook 21 to free pin 12. The same process occurs with the other rack to open the door in the other direction. The parts assemble in such a way that the door closure is not very thick and can be mounted directly inside a section of the door.

Abstract: Plastic bottle blanks (1) are rotated and conveyed neck down through a rotary thermal heating station (3), and neck up to a transfer station (5) and through a blow molding station (4), thus making it possible to simultaneously hold the blanks by their necks during the entire treatment and to easily remove the finished hollow bottles by gravity.

Abstract: Concave rails 17, upon which a pipe which is to be treated by at least partial immersion can be placed, are fixed in the bottom of a furnace 1 which contains a treatment bath M. In order to guarantee that the pipe is immersed over the whole of its cross section and in order to eliminate the risk of it becoming oval, the furnace is subjected to alternating rotation about its axis XX, which compels the pipe to turn on itself by rolling on the rails 17. The handling of the pipe is achieved by arms 12 which are assembled in a pivoting manner on the external wall of the furnace and controlled by an actuator 15.

Abstract: Tubes and method of manufacturing tubes from alloyed steel adapted to be welded for underwater hydrocarbon pipelines having high ductility at low temperatures. A low carbon alloyed steel containing less than 0.08% carbon and with at the most 0.30% silicon, also containing manganese and a metal generating special carbides such as molybdenum, niobium, vanadium and like-acting substances, is cast in a centrifugal casting mould after which the centrifugally cast tube is subjected to controlled cooling and a thermal treatment. Tubes so constructed may be used for drilling tubes, tubes for underwater pipelines and tubes for the construction of drilling platforms at sea in cold regions and applications requiring high ductility at low temperature.

Abstract: An injection molding installation includes a box-like mounting base 1 on which are disposed a molding press 2 and a pressure injection apparatus 3. The press 2 includes fixed opposite end plates 4 and 7 mounted directly on the base 1 and an intermediate movable plate 5 slidably bearing on the base via an adaptor wedge A. The injection apparatus includes a motor driven rotary screw conveyor 18 and a plastics material feed funnel 19, and is removably mounted on the base 1 via an interchangeable support rail 22 clamped by internal cross bars 25 to the base or to intermediate spacer inserts 26 mounted thereon. The use of the adaptor wedge and interchangeable support rails enables the accommodation and mounting of molding presses and injection apparatuses having different sizes and configurations on a common and thus standardized mounting base.

Abstract: A pipe or similar tubular member of ductile cast iron having an end casing. The thin walled casing has a curved profile at its entrance divided into two sections, of which one is formed by centrifugal casting, whereas the other, of lesser curvature, is made by hot or cold forming with a simultaneous axial compression and a radial bending directed towards the axis of the pipe. The invention is useful for forming fluid tight seals in pipelines using radial compression packings.

Abstract: The pipe has on its cylindrical wall (2) at least one corrugated circular projection (9) having the same thickness (e) as this wall. This circular projection has meridian section in the shape of an isosceles triangle having an obtuse apex angle (x) and a radiused apex (10). This triangle is connected to the cylindrical wall by wide portions (11) having a radius (R) which exceeds the radius (r) of the apex (10) and is a plurality of times greater than the thickness (e) of the wall (2).

Abstract: Two voussoirs forming part of a tunnel lining have their adjacent longitudinal sides in mutual contact, each side having a convex radial profile. The voussoirs are rigidly locked relative to each other by circumferential bolts 10 and by wedges 15 and 16 wedged into opposing recesses in the adjacent sides by radial bolts 17. In comparison to the 180.degree. relative angular position of the voussoirs which occurs when the radius of the lining is equal to that of the voussoirs, an angular position, higher or lower than 180.degree., can be used in order to obtain a lining radius larger or smaller than that of the voussoirs.

Abstract: In a centrifugal casting apparatus, the rate of flow of molten iron poured into the mold is controlled by varying the inclination of the feed channel. In particular, at the end of the casting operation, the supply of liquid to the feed channel is cut off and the upstream end of the feed channel is progressively raised. This can be controlled automatically by a cast iron level detector adjacent the pouring spout. In this manner, localized thickness defects in a series of pipes can be corrected. Furthermore, pipes of constant thickness throughout their length can be provided without the need to vary the translational speed of the feed channel or vary the rate of pivoting of the ladle of molten liquid.

Abstract: A large diameter pipe joint in which the male end and the female mouth end have respective opposite load bearing surfaces 5, 22 between which are arranged bracing means capable of evenly distributing tensile forces over the whole periphery of the joint by means of an incompressible mass 27 of an initially fluid filler material. The mass is contained in a space sufficiently closed on all sides by an annular component 23 disposed between the two support surfaces 5, 22 to be impermeable to said filler material. This joint is particularly suitable for large diameter pipes laid in trenches, where the axes of adjacent pipe sections lie at a small acute angle to each other after installation.

Abstract: Tubular members of lightly alloyed weldable steel are utilized as a stiffening member for pipelines to prevent buckling and the spread of cracks in pipelines laid off the coast, either under or above water. The tubular member (R, R1) is constructed of centrifugally cast steel and is adapted to be connected to another similar member or to a standard pipe (T) of the pipeline. The member has a substantially increased thickness (2, 15) and is subjected to thermal treatment in order to obtain a homogeneous ferritic structure.

Abstract: A profile strip 1 is composed of a rectangular cross-sectional body 2 having on each edge a recessed fastening means 3, 4, one male and the other female. Each fastening means 3-4 comprises an axial support flange 10, 13 which lengthens one of the exterior and interior surfaces 5, 6 of the body 2. The two adjacent flanges are abutting, and the two fastening means when engaged define, with the adjacent sides 7 of the body, a U-sectioned space which is filled by a border insert 16 having a complementary cross-section. The invention enables large diameter tubes of plastic material to be formed without any internal or external projections.

Abstract: An extractor carriage is furnished on each side with an elbow bracket projecting towards its lower portion. To each of these brackets is attached the end of a cable which moves the carriage in its forward direction towards the centrifuging machine. Each cable is protected at its upper portion from sand debris by lateral wings extending from the upper portions of a trough which receives the debris. These cables, as well as a third cable for returning the carriage, are wound around a single motor drum driven by hydraulic motors which are capable of operating at several speeds. The invention may be applied to centrifuging equipment for cast iron pipe.

Abstract: Mechanical control carried by a floating caliper 3 with friction pads 9a, 9b around a brake disc 1.A system A of drum cams 16-17 with four helicoidal inclined faces joined in pairs to transform a rotation movement of a control lever 11 into a translation movement imparted to friction pads 9a, 9b so that they clamp on disc 1.The drum cams make it possible to transform and amplify the rotation drive movement imparted by the control lever. Application to heavy vehicles, tractors, road equipment, etc.

Abstract: The coupling of two tubular elements is achieved by welding them together by energization of an electrical resistance element, the one element comprising a male end, the other a socket end. The coupling operation is carried out by means of a composite connecting piece comprising two rings which are fitted on one another, one acting as a support for a bifilar electrical resistance element and the other as a sheath. The electrical resistance element is thus uniformly coated in plastic material and is accurately centered, thereby ensuring uniform heating and welding. This coupling method is for use in coupling discharge pipelines for waste water and rain water and for conduits for industrial fluids.

Abstract: This support is adapted to support pouring spouts at the upstream end of two pouring channels which are mounted on a common carriage which is movable transversely. It comprises a platform mounted on the movable carriage by a device which is adjustable in height. This device is disposed between the two pouring channels and provided with actuating means including motion direction changing means such as bevel gears. This platform is slidable on two guide pillars carried by the carriage on each side of the device adjustable in height and between the two pouring spouts.

Abstract: The process comprising supplying an electric arc furnace with ferrous products and fluxes so as to form a bath of metal and slag and adding carbon to the bath of metal. The ferrous products are pre-reduced ores which are continuously introduced into the furnace between the electrodes of the furnace in the course of the formation of the bath. A carburizing agent is introduced to bring the carbon content of the bath to a value between 1.7 and 6.7%. Thereafter, the slag is removed. If desired, the carbon content of the cast iron can be brought to the desired value by adding further carburizing agent. The cast iron is then poured from the furnace.

Abstract: The process is particularly intended for the casting of thin tubes of iron in a vertical annular die defined by a mould and a core. It comprises maintaining in the liquid state metal under pressure poured into the die and in contact with the core so as to create a substantially frustoconical solidification front which extends from a point of the wall of the mould in the vicinity of the input end of the die and reaches practically the lower end edge of the core. The installation for carrying out this process comprises a heating device inside the core and a liquid metal jacket under pressure which surrounds the mould and is surrounded by a water cooling jacket.

Abstract: In this butterfly valve structure having an elastic sleeve, an outer projection of the sleeve in the free state has the same sectional shape as a groove in the body of the valve. The radial thickness of the seat is at least equal to ten times the depth to which the valve member, when closed, penetrates into the seat. The depth of the groove is at least equal to 4/10 of the minimum radial thickness of the seat. The axial length of the bottom of the groove is of the same order of magnitude as that of the seat. The corners of the groove are rounded. This valve structure is of particular advantage for high temperature and/or when the valve member remains closed for a prolonged period.

Abstract: An aseptic packing machine comprising an enclosure defining a space swept through by a stream of sterile air and means for producing said stream of air. A station for producing containers, a filling station, a closing station and a transfer device cooperating with said stations are disposed inside the enclosure. The moving mechanical parts of said stations and said transfer device which are capable of being contaminating are located outside the part of said space which is maintained non-contaminating by said stream of sterile air.