Seatback-seat linkage mechanism

A seatback-seat linkage mechanism being provided for use in combination with a seatback and arranged on a plurality of seat pipes, the seatback-seat linkage mechanism comprising:

• a plurality of connecting rod assemblies connected to the seatback;
• a seat movably disposed on the two seat pipes, wherein the connecting rod assemblies are connected to the seat, the seat includes two seat supports, two rear pin support assemblies and two front pin support assemblies, each of the seat supports includes a first end and a second end, each of the seat supports is provided with a first slide slot and a second slide slot which is located closer to the second end than the first slide slot, and the first slide slot is located closer to the first end than the second slide slot;
• each of the two rear pin support assemblies is disposed on one side of a corresponding one of the two seat supports, located adjacent to the first slide slot of the corresponding one of the two seat supports, and includes a first groove portion and a first pin portion, the first groove portions are provided for engaging with the seat pipes, the first pin portions are inserted into the first slide slots;
• each of the two front pin support assemblies is disposed on the one side of the corresponding one of the two seat supports, located adjacent to the second slide slot of the corresponding one of the two seat supports, and includes a second groove portion and a second pin portion, the second groove portions are provided for engaging with the seat pipes, and the second pin portions are inserted into the second slide slots.