Agricultural machines with improved foldability of its lateral frames

An agricultural machine with improved foldability of its lateral frames, comprising a central frame (9) and lateral frames (10, 10′) articulated adjacent at each end thereof, wherein the central frame is linked perpendicularly to a central fixed tongue (2) secured to said central frame and a telescopic tongue (2′) able to be displaced axially with respect to said fixed tongue portion;

• wherein the central frame sits supported on wheels while free ends of said lateral frames are supported on corresponding end wheels (7);
• wherein each lateral frame is articulated to an end of an inextensible brace (5), while another end of each brace is articulated at the same distance on a stretch of the telescopic tongue (2′), forming a deformable rhomboid kinematics;
• wherein each lateral frame is subjected to a reciprocal angular displacement of opposite sign with respect to the central frame from its extended working frame position substantially aligned with the central frame section, until it is folded against the sides of said tongue, configuring the travel folded position thereof, parallel to said tongue;
• wherein at least the central frame and/or the lateral frames have seeds and/or fertilizers deposition devices (14, 14′) provided by at least one container or hopper (4) carried by said agricultural machine and conducted from said container to said deposition devices;
• wherein the agricultural machine comprises corresponding arms (12) articulated by means of a first articulation (18) on one end of each arm at both sides of the fixed tongue (2) adjacent to its attachment to the central frame and independently of the central frame, being said arms (12) coplanar to the central frame;
• wherein each one of said arms (12) has its other end articulated by means of a fourth articulation (12a) to the adjacent end of the corresponding lateral frame (10, 10′), and between the ends of each of said arms there is a further second articulation (16) on which the end of a corresponding hydraulic piston (15) is connected;
• wherein each of said hydraulic pistons (15) is arranged obliquely on each side of the fixed tongue (2) and by means of a third articulation (17) the rod of each cylinder is connected to said stationary portion of the fixed tongue (2) at a same distance thereof;
• wherein the length of said arms being such that in the unfolded machine condition (operative position), the lateral frames (10, 10′) are adjacent and aligned to the ends of the central frame;
• wherein in said deployed and operative position of the agricultural machine, said first pair of articulations (18) is placed between the third pair of articulations (17) and the second pair of articulations (16), being this second pair of articulations (16) placed closer to the central frame, while the fourth pair of articulations (12a) linking each arm (12) to its the lateral frame is placed at a greater distance from the central frame with respect to said second articulations (16), but at a lesser distance in relation to said first articulations (18);
• wherein said arms (12) when folding each of the lateral frames describes an arc of circumference of a magnitude greater than the distance from the central portion of the frame to the wheels (31, 32) and means of suspension thereof and of their attachment to the central tongue;
• and
• wherein the telescopically displaceable tongue (2′) is housed within said fixed portion (2) of the tongue, while said central section of the frame and fixed portion of said tongue defines an area within which it is placed the wheels train (31, 32) supporting said structure.

An agricultural machine, comprising:

• a central frame (9) comprising a first end and a second end, and comprising two or more wheels;
• a first lateral frame (10) comprising first and second ends, wherein the first lateral frame is supported on said second end by an end wheel (7);
• a second lateral frame (10′) comprising first and second ends, wherein the second lateral frame is supported on said second end by an end wheel (7);
• a central fixed tongue (2) secured to said central frame;
• a telescopic tongue (2′) configured to be displaced axially with respect to said fixed tongue portion, wherein the telescopic tongue is configured to be reversibly housed within said central fixed tongue;
• a first extensible brace (5) articulated at a first end to the first lateral frame, and articulated at a second end to a portion of the telescopic tongue;
• a second extensible brace (5) articulated at a first end to the second lateral frame, and articulated at a second end to a portion of the telescopic tongue;
• a hopper (14) configured to carry seeds and/or fertilizer for deposition;
• one or more seed and/or fertilizer deposition devices (14, 14′) configured to receive seeds and/or fertilizer from the hopper for distribution;
• a first corresponding arm (12) connected by a first articulation (18) to a first end to a first side of the central fixed tongue, and connected by a second articulation (12a) to a second end to the first end of the first lateral frame;
• a second corresponding arm (12) connected by a first articulation (18) to a first end to a second side of the central fixed tongue, and connected by a second articulation (12a) to a second end to the first end of the second lateral frame;
• a first hydraulic piston (15) connected at a first end to the first corresponding arm via a third articulation (16), wherein said first hydraulic piston is connected via a second end to said central fixed tongue via a fourth articulation (17);
• and
• a second hydraulic piston (15) connected via a first end to the second corresponding arm via a third articulation (16), wherein said second hydraulic piston is connected via a second end to said central fixed tongue via a fourth articulation (17).