Spreader for granulated products by forced projection

A spreader for granulated products by forced projection, comprising:

• a carrying chassis (62', 62') on which is mounted at least one element for the transmission (65', 66') of a movement of rotation which is meant to be coupled to a motor,
• a hopper (1) mounted on the chassis and destined to contain the load of granular products (2) capable of flowing through at least one opening (3) at the base of the hopper (1),
• means of raising to speed and of forcibly projecting granular products, which are secured onto the chassis and fed with granular products from at least one opening (3) at the base of the hopper (1), and means (18) for the distribution of the projected granular products, the said means of distribution (18) being also secured on the chassis, and
• in which the said means of speeding up and of forced projection (10) are arranged in at least one caster group, comprising a first cylindrical roller (11) mounted in rotation on the chassis around its fixed axis (12), and the external lateral surface of which forms a first mobile endless surface delimiting, with a second mobile endless surface, a projection spout having an inlet (15) and an outlet (16) which have a passage section progressively and respectively decreasing and increasing, one at least of the endless surfaces being positively driven from the said transmission element and forming a driving surface, which drives the granular products introduced into the inlet (15) of the projection spout to the outer (16) of the latter so that these products receive, between the two mobile endless surfaces, a linear speed which ensures their projection outside the projection spout, characterized in that the second mobile endless surface is also formed by the outer lateral surface of a second cylindrical roller (13), mounted in rotation on the chassis around its axis (14) and in such a position that the first (11) and the second (13) rollers, one of which at least is coated with a peripheral coating of a deformable elastic material, are substantially externally tangent to one another, so that the granular products are projected out of the projection spout (15,16) in a thin sheet centered on the tangent plane shared by the two rollers (11,13) the axes (12,14) of the rollers are substantially parallel to one another and substantially horizontal;
• means of injection of the granular products (2) into the projection spout (64,65) of at least one caster group, the said means of injection comprising an injection spout (62, 63), having an input (62) and an output (63) the sections of passage of which are progressively and respectively decreasing and increasing, and which is situated between the base (6) of the hopper (1) and the projection spout (64,65) of each corresponding caster group, and delimited by the outer lateral surfaces of two cylindrical rollers (55,59) substantially externally tangent to one another and mounted in rotation on the chassis each around its axis (56,60) substantially parallel with the axis (58) of the second roller (57) of each corresponding caster group, one at least of the two rollers (55,59) which delimit the injection spout (62,63) being positively driven in rotation from the said element of transmission, to constitute a driving roller driving away the granular products introduced from the base of the hopper (1) into the input (62) of the injection spout up to the outlet of the latter (63) while transmitting to them a linear speed such that the granular products leave the outlet (63) of the injection spout in a thin sheet centered on the tangent plane shared by the two rollers (55, 59) delimiting the said injection spout, the said means of injection also comprising, for each corresponding caster group, an injection deflector (61) carried by the chassis and which is curved, with the concave face turned towards the first roller (55) and which guides the sheet of granular products leaving the outlet (63) of the injection spout to the inlet (64) of the projection spout.