Tiering device, comprising an arm (1) having a lower end section where it connects a tilling element (2), and an upper end section that is coupled, by means of a connection mechanism, to two plates (4) supporting a frame (5) that is part of a step； wherein said connection mechanism includes an articulated connection (28) and a spring (6) that works in compression, the ends of which rest on a first articulated stop (7a) and on a second articulated stop (7b)； characterized in that: - the second articulated stop (7b) is coupled on two recesses (9) of two opposed extensions (10) integral with the arm (1), while the first articulated stop (7a) is coupled on two other recesses (8) located on the two plates (4) integral with the frame (5)； - the articulated connection comprises a tubular body (14) integral with the arm (1), in combination with a screw (11) that is inserted into the interior of the tubular body (14) with the interposition of intermediate bushes (13)； where end sections of said screw (11) are fitted in bottoms of opposite grooves (15) located in the plates (4) integral with the frame (5). (Machine-translation by Google Translate, not legally binding)1. Dispositivo de grada, que comprende un brazo (1) que tiene un tramo extremo inferior donde conecta un elemento de laboreo (2), y un tramo extremo superior que se acopla, mediante un mecanismo de conexión, a dos placas (4) solidarias a un bastidor (5) que forma parte de una grada； donde dicho mecanismo de conexión incluye una conexión articulada (28) y un resorte (6) que trabaja a compresión, cuyos extremos asientan sobre un primer tope articulado (7a) y sobre un segundo tope articulado (7b)； caracterizado por que: - el segundo tope articulado (7b) está acoplado sobre dos rebajes (9) de dos extensiones contrapuestas (10) solidarias al brazo (1), mientras que el primer tope articulado (7a) está acoplado sobre otros dos rebajes (8) ubicados en las dos placas (4) solidarias al bastidor (5)； - la conexión articulad
