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according the invention; FIG. 7 is another perspective view of the carriage of FIG. 6. The carriages according to the invention shown in the drawings each have a carriage support 1,1’ that can run along frames or tracks 2,2’ of a respective sorting apparatus carriage on freely-rotatable wheels, rollers or the like 3,3’. At opposite, front and rear ends of each carriage ends of support 1,1’ there is a pair of uprights 4,4’, on which respective hinges 4a, 4a’ tiltably support plate supports 5,5’ for a plate 6,6’ therebetween. Below the plate 6 and between the supports 5 in the carriage according to FIGS. 1 to 5 is a motor-reducer unit, which makes plate 6 tilt. Its motor 7 will be, prefer ably, of the self-braking electric kind, and its reducer 8 will be, preferably, axially in line with motor 7. Electric feed to the motor 7 takes place through con ducting rods 9 (only one shown) spaced along one of the tracks 2 for the carriageand a sliding contact 10 therefor ?xed to the carriage support 1. Particularly ?t is a permanent magnet direct current motor 7 having distinct acceleration characteristics allowing precise control of plate rotation. One of the supports 5 for the plate 6 has an opening 11 (FIG. 2) with a seat 11a for a pin 12 (or the like) for locking the plate in an horizontal position. There are also, therefore, devices (not shown) of known type, e.g. an electromagnetic, for unlocking the support for tilting the plate. Having the motor 7 and reducer 8 in line saves space to a certain extent, and allows both to be held inside a single preferably cylindrical container 13. The con tainer protects these parts against dust or other foreign bodies. To stop tilting the plate, micro-switches 14 or the like spaced on one upright 4 are actuated by cams 15 se cured to one of the supports 5 for the plate. In the carriage of FIGS. 5 and 6, a step-by-step motor 16 is used in place of motor 7 and reducer 8. It is di rectly linked to place 6’ by an arc of a pinion-coopera tive hoop 17 secured to the plate 6' and a pinion 18 mounted on a shaft of motor 16. Operation of either carriage (with reference, too, to a few further details) takes place as follows The carriage is dragged along frames or tracks 2,2’ of the sorting machine by a chain 19 (FIG. 3) or a belt 20 (FIG. 6) driven by a central motor (not shown). As each carriage passes before loading and coding zones (not shown), the operator lays the article to be sorted down on plate 6,6’ and makes a known coding for directing the object towards a thereby selected collecting zone. A microprocessor (not shown) programs the whole apparatus, sending electric feed to the conducting rod 9 (not shown for the carriage of FIGS. 6 and 7) when the carriage passes that selected collecting zone. The motor 7, 16 then takes current from the conduct ing rod 9 through sliding contact 10, causes the plate 6,6’ and supports 5,5’ to tilt and, thus, unloads the ob ject. At the end of such a tilting stroke with the carriage of FIGS. 1 to 5, a cam 15 acts on a microswitch 14 to stop the stroke and automatically control reverse tilt until plate 6 is brought back to the horizontal position shown. This is checked by a photocell 21 or an analogous known system connected to control the motor 7, too. In the case of the step-by-step motor 16 of the carriage of FIGS. 6 and 7, the cell 21 is obviously unnecessary, as this kind of motor permits exact tilting rotation. The advantages of the particular arrangements of the parts of the carriages according to the described above are clearly visible. First of all, electrically tilting the plate makes the structure considerably lighter and al lows the carriage to reach much higher speeds