Abstract: The heat-exchanger reactor comprises a cylindrical metal containment (1) intended for receiving a chemical substance, this containment (1) having passing axially through it a metal tube (2) intended for the circulation of a heat-exchange fluid. The tube (2) possesses radial fins (3) extending substantially over the entire height of the cylindrical containment (1) and over the entire radial distance between the tube (2) and the inner lateral face of the cylindrical containment (1). The invention is used particularly in devices for the generation of cold or heat by solid/gas reaction.

Abstract: A device for producing cold between +10.degree. C. and -40.degree. C., particularly in transport vehicles comprises at least one reactor (R), a condenser (C), a gas collector (Co) and an evaporator (E). The following simultaneous reactions are produced in the reactor (R): ##EQU1## the symbols < >; [ ] and ( ) denoting the solid, liquid and gaseous states respectively, X being chosen from ZnCl.sub.2, CuSO.sub.4, CuCl, LiBr, LiCl, ZnSO.sub.4, SrCl.sub.2, MnCl.sub.2, FeCl.sub.2, MgCl.sub.2, CaCl.sub.2, and NiCl.sub.

Abstract: A rotational-locking member such as an endless screw for actuating a sliding door by means of a nut is locked in position by rotational displacement of the nut and is unlocked by means of a device comprising a pulley coupled to the endless screw and rigidly fixed to a clutch-disk. A second clutch-disk slidably mounted on a square sleeve of a bevel-pinion can be rotated by means of a pair of bevel-pinions and a lever. A lug of the second disk cooperates with a helical groove of a stationary cam in order to subject the disk to a helical movement, the rotational motion component of which is imparted to the endless screw after engagement of the disks in order to unlock the screw.

Abstract: A device for suspending and guiding an oblique-displacement sliding door, especially for railroad cars, comprises a rolling element which is attached to the door by means of a connecting member (4) and comprises two rollers (Gs, Gi) mounted within a tubular guide track (6). The rolling surfaces (6a, 6b, 6c, 6d) of the guide track (6) are located in oppositely-facing relation on each side of the connecting member (4) and at an oblique angle with respect to this latter. The profiles of the two rolling surfaces and of the two rollers are adapted to each other so as to prevent translational displacement of the rolling element (2) in a plane transverse to the guide track (6).

Abstract: Balls such as table tennis balls or tennis balls are continuously fed to two pairs of adjacent flanged rollers of a ball-throwing head by a blower and two transfer ducts. Balls hit by the player are collected by a net and a trough, then fed back to the head. The rollers have separately variable speeds of rotation, a gap being provided between each pair of rollers and adapted to the diameter of the balls. The balls are directed alternately into each transfer duct, the opening of which is located opposite to each gap.