Abstract: A method of manufacturing and using a resinous concrete in the production of forming tools for stamping, trimming and other treatments of sheet metal parts. The process includes first mixing at least one resin and hardening agent and then adding a siliceous pulverulent grain filler so that the gravimetric ratio between the resin and hardening agent and the filler when mixed for a time depending on the working temperature at a work site will result in a mixture of filler grains and resin essentially free of macromolecules and having remaining spaces between the grains filled with the essentially macromolecular free resin thereby eliminating the formation of bending bridges. The final mixture is then poured into a casing containing working parts and moulding elements to create forming tools useable after the mixture polymerizes.

Abstract: Forming tools are arranged inside a metallic caisson formed by means of open boxes provided with nesting portions. The forming tools are connected to a microwave generator and are made of a material with a small absorption capacity for the microwaves and adapted for supporting pressure within the range of 50 to 200 bars. The forming tools have working faces of a shape mating that of a work piece to be obtained.

Abstract: For reinforcing the connection between the tubes of a heat exchanger and the tube end plate in which they are engaged, the tube end plate is formed by punching for delimiting collars having a bevelled end and forming bulged bottoms between the collars, then a small plane plate is applied on the bulged bottoms, the small plane plate being brazed in the same time as the tubes and the tube end plate.

Abstract: The heat exchanger comprises tubes engaged into fins and tube plates connected to header boxes. The header boxes form on their smaller sides stirrups between the legs of which are defined inner edges on which are crimped the ends of platens formed by the tube plates. Moreover, the lugs of the side flanges are bent over on the sides of the stirrups.

Abstract: The connection device between a tube end plate and a header box of a heat exchanger comprises at least one clamp bearing underneath bottom of a peripheral groove of the tube end plate and on top of a peripheral bearing flange of the header box by means of lugs separated by notches. The clamp is preformed for defining upper lugs and lower lugs, said upper end lower lugs being separated by a measure for which a gasket mounted between the tube end plate and the header box is deformed in a regular manner, and said clamp having at least one lower lug of a greater length than width of the bottom of the peripheral groove of the tube end plate and being bent over beyond said bottom.

Abstract: The connecting device for housing-shaped elements and the application thereof to the making of housings for air conditioning systems for vehicles is characterized in that one of the elements has a projecting lip (8) thereon, while the other element has a receiving flange for the projecting lip (8) bearing (14) and retaining (19, 21) means being provided alternately between the projecting lip (8) and the receiving flange.

Abstract: The heat exchanger comprises a tubular core having tubes engaged into perforations of fins inside which they are inflated. The tubes are designed for being tightly connected to tube-plates by means of deformable gaskets. The tube-plates comprise resilient interlocking elements cooperating with mating portions of the core.

Abstract: In a method for crimping a tube end plate of a heat exchanger on a header box, there is provided a peripheral upright edge for enclosing an extra thickness defined by the header box. Portion of the upright edge of the tube end plate which has to extend, when assembled, at least in part above a flange of the header box is stiffened. The stiffened portion of the upright edge of the tube end plate is folded at least partly back onto the flange of the header box.

Abstract: The tube end plate for a heat exchanger having tubes engaged into collars of the tube end plate which is covered by a water box is provided with a peripheral groove cooperating with a lower portion of the water box to which it is rigidly connected for forming therewith a hollow beam. There is provided a bottom portion of tube end plate in which are made tube passages defined by collars to which are brazed the tubes and between which are provided transverse slots extending transversely up to an inner wall defining the peripheral groove.

Abstract: The device comprises a screw driven by a motor for raising and lowering a nut supporting a pivotally mounted arm onto which is fixed a platform able to pass through an opening of a door, and which is then placed on the vehicle floor. A load, for example a trolley, may be fixed on the platform by an anchoring device.

Abstract: A method of brazing heat exchanger cores in a cell inside which two heat exchangers are subjected to a gas flux flowing first through one heat exchanger in a first direction, then to a gas flux flowing through other heat exchanger in an opposite direction.

Abstract: A seat, which is transformable into a berth for a vehicle comprises a horizontal seat member and a seat back connected to the support of the seat member by an articulated linkage. The linkage maintains the lower portion of the seat back in permanent contact with the rear portion of the horizontal seat member during the pivoting movement of the seat back, from an upstanding position to a position in which the surface of the seat and member of the seat back are in alignment.

Abstract: Device for mutual assembly of two parts which have to be occasionally disassembled, said two parts being produced from a synthetic material by moulding. There is provided on the outer wall of said parts at least one assembling group comprising a male portion on one of the parts and a female portion on the other part, the female portion defining a member for freeing the male portion and each of the two parts being formed with protrusions or noses for the subsequent engagement of resilient clips should there be a deterioration, even partial, of the assembling group during disassembly.

Abstract: A method for the manufacture of heat exchangers where tubes of rectangular section are assembled with dissipators for forming a plane core which is curved by applying a bending force on the small sides of the tubes, thereby making cores. These cores are assembled by engaging the ends of the tubes into tubular plates which are part of boxes.

Abstract: The tube has an oblong shape in cross-section with smaller sides rounded. The two ends of the tube are shaped so that the larger sides are formed with concavities making that in cross-section said two ends have a figure 8 shape over a portion of height corresponding at least to height of insertion of the tube in a tube plate.

Abstract: An industrial cooling exchanger used for cooling air or another gas comprises an inlet collector and a return collector connected by heat exchanger elements dismountably assembled to said collectors by insertable parts. The collectors are floatingly mounted and a tight assembly between the collectors and the heat exchanger elements is provided by interposing therebetween at least one deformable gasket.

Abstract: The outlet header tank forms two compartments separated by a partition wall provided with a hole in its lower portion and causing a pressure loss at least equal to the head of water in the header tank so that air possibly existing in the compartment is expelled via a pipe.

Abstract: The heat exchanger comprises a core of tubes engaged into tubes plates defining a peripheral groove bounded outwardly by a raised edge with a sealing gasket being placed in the bottom of the groove in order to be clamped by under side of an edge of a header box maintained by gripping means. The header box is thin walled and the edge of said header box has a top portion with a small bar interposed between said top portion and said gripping means.

Abstract: The device for resiliently mounting a radiator in a frame of a vehicle, particularly a heavy-truck vehicle, comprises a cradle surrounding the radiator, and resilient means urgingly mounted between headers of the radiator and corresponding portions of the cradle for exerting a permanent compression effort onto the radiator.

Abstract: To prevent the erosion caused by cavitation phenomena between a turbulence member and a tube of a tubular heat exchanger, as well as the corrosion by differential aeration in thin intervals between the tube of aluminum containing alloy and an elastomeric gasket, aluminum silicon platings are provided on the two walls of the tube.