Abstract: A seatback-seat linkage mechanism includes two connecting rod assemblies and a seat. The connecting rod assemblies are connected between the seat and the seatback. The seat is mounted on the seat pipes and includes two seat supports, two rear pin support assemblies and two front pin support assemblies. Each of seat supports is provided with a first slide slot and a second slide slot. The rear and front pin support assemblies are mounted on the seat pipes in such a manner that the first pin portion of each of the rear pin support assemblies is inserted in the first slide slot, the second pin portion of each of the front pin assemblies is inserted in the second slide slot, so that, when the connecting rod assemblies drive the seat to move, the seat is able to reciprocate stably along the extending directions of the first and second slide slots.

Abstract: A conveying apparatus capable of ascending or descending stairways and carrying goods consists of a frame, a transmission mechanism and a driving mechanism located on a lower section of the frame. The transmission mechanism includes a planetary gear set and is with two degrees of freedom. When moving on the floor, the driving mechanism may drive a driving wheel in the transmission mechanism to deliver output of the conveying apparatus based on floor conditions, thereby to ascend or descend the stairways, or moving on the plain floor.