Agricultural tool unit for rapid conversion of a combination seed drill having a trailed or fine-grain seed dispenser to an on-demand supply system and vice versa

An agricultural implement assembly for rapid transformation of a seed drill combined with a dragging or drilling seed dosing device to a supplier on demand comprising:

• at least one hopper containing a granular input and a delivery device arranged below and in communication with said hopper, said delivery device comprising a delivery box having respective side walls delimiting its width, a bottom wall, a top wall in communication with a seed chamber from the hopper, a rear wall having an inlet of an air current, and a front partition establishing at least one outlet for at least one granulated input dragging air current from said delivery box, wherein attached against said front partition and at least part of said top wall of the delivery box is arranged a removable seed injection chamber, using holding and linking means and copying a profile of the front partition and top wall, said removable seed injection chamber having two interchangeable and distinct injection chamber construction variants;
• a first variant of the two interchangeable and distinct injection chamber construction variant comprises at least a first chamber wall attached to the front partition of the delivery box, a second chamber wall separated from the first chamber wall by establishing a passage between both the first and second chamber walls and a bottom, said first chamber wall being formed by a blind wall that copies a profile of the top wall of the delivery box, and portions of side walls;
• in at least part of a roof or vault of the first injection chamber providing a communication of an interior of said first injection chamber with the delivery box which in turn communicates with the bottom of the hopper, establishing an entry of the inputs from the hopper to said seed chamber and from there to the injection chamber;
• in portions of the side wall of the delivery box and above a top wall thereof there are seats of a respective end of the axis of a cylindrical body, with fastening and holding means, said cylindrical body being rotatable about its axis inside the seed chamber, and interposed and facing the communication between said hopper and seed chamber, said cylindrical body providing mechanical dragging means of the inputs towards said seed injection chamber and forming a drilling delivery device therewith;
• a second variant of the two interchangeable and distinct injection chamber construction variant comprises a first chamber wall attached to the front partition of the delivery box, a second chamber wall spaced from the first chamber wall establishing a passage between both walls and a bottom, said first chamber wall being at least partly permeable to the passage of a second air current from an air chamber into the seed chamber, which copies a profile of the top wall of the air chamber, having a roof or vault of the injection chamber of the second injection chamber wall and portions of side walls;
• a partition being disposed adjacent to the top end of the first chamber wall of the injection chamber projecting towards the roof or vault of said injection chamber, establishing a passage between a free edge of said partition and said roof or vault, the partition defining a retention slope by overflow of the granulated inputs, forming a supply device on demand;
• between said first and second walls, at least one communication is substantially aligned with the at least one outlet of a main air current of the delivery box, the second wall of the seed injection chamber having at least one air outlet in communication with the granulated inputs to the ground.