A boom, particularly a spreading boom for suspensionon an outer frame (1) of an agricultural tool and of thetype in which the suspension device comprises springsuspension and shock absorbing devices in the form of atrapezoidal suspension with two substantially parallel beams ofwhich one is connected to the outer frame (1). Accordingto the invention the upper beam of the trapezoidal suspensionis linked, each of the links (6, 7) being pivotallyconnected to the outer frame (1) and springs (12) beingarranged on both sides of the linkage (20, 21), but on theother side of the centre of suspension (8, 9), The individualspring (12) is arranged between one of said links (6,7) and a separate beam fastened to the outer frame (1).
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