Siderail assembly especially for a hospital bed (1) for keeping the patient in horizontal position, comprising Load-bearing support bracket (16) of the Siderail mechanism (12) that is firmly attached to a part of the rest area (4), a side arm (15) and a main arm (9) of the siderail that is rotationally connected to the load-bearing support bracket (16) for supporting the siderail mechanism (12) and siderail body (8), a pawl (19) rotationally connected to the main arm (9) of the siderail, a dampening element (20) rotationally connected to the main arm (9) of the siderail and a load-bearing support bracket (16), and a handle (11) interconnected with the locking mechanism, wherein the mechanism allows for a smooth and dampened lowering and lifting of the siderail body (8).
