Abstract: The synchronizer comprises: a hub, an actuating sleeve, two synchronizing rings each having a conical surface, two inner rings each having a conical surface, two intermediate rings each having a first radially outer conical surface arranged to be brought into contact with the conical surface of the associated synchronizing ring and a second radially inner conical surface arranged to be brought into contact with the conical surface of the associated inner ring, two engagement ring gears intended to be torsionally coupled each to a respective idle gearwheel. According to the invention, the synchronizer further comprises two spacer rings which are each interposed between the respective engagement ring gear and the respective inner ring and each free to rotate relative to these two components so as to prevent the respective opposite axial surfaces from coming into contact with each other.

Abstract: This invention concerns a device for regulating a tundish stopper, whereby the stopper (I2) submerged in the tundish (I0) is connected rigidly (I3) to a substantially parallel shaft (I5) moving parallel to said stopper (I2), and whereby the substantially parallel shaft (I5) has a tract with a rack (I8) cooperating with a toothed sector (I9) having a lever (20), and whereby a reaction slide block (25) cooperates in a coordinated manner with the toothed rack tract (I8), and whereby there is present an axially movable sleeve (27) which can be clamped (33) to said shaft (I5) and which cooperates with a threaded ring nut (34) performing axial adjustment, and whereby it is possible to mechanise either the toothed sector (I9) or the movable sleeve (27) or both of them (I9-27).