Rotorrive

The rotary rake (24) comprises an elongated running frame (2) designed at one end to be connected to a tractor. At least one arm (1) is fastened to the running frame (2) through a pivot joint so as to be pivotal about a pivot axis (3) so that the arm (1) is able to swing between a lowered working position and a raised transport position. The arm (1) is connected to a rotor (25) with a chassis (5), the arm (1) comprising a number of arm members which are pivotally interconnected through intermediate pivot joints the pivot axes of which are substantially vertical in the working position so that the rotor (25) is movable between an outermost position in which the arm (1) presents a longest effective arm length (A) and an innermost position in which the arm (1) presents a shortest effective arm length (a). The arm (1) comprises at least two elongated arm members (11, 13) and at least three of the said intermediate pivot joints, a first elongated arm member (11) being pivotal about a second pivot axis (10) relative to the running frame (2), a second elongated arm member (13) being pivotal relative to the first elongated arm member (11) about a third pivot axis (12), and the chassis (5) of the rotor being pivotal relative to the second elongated arm member (13) about a fourth pivot axis (14).