Patent ID: 6062321
Filing Date: 2000-05-16
Classification: A01B,B60D

Abstract:
A front lifting device for an agricultural tractor, allowing an implement to be hitched up at two lateral bottom points and a central top point, comprising:a backframe intended to be fixed to a chassis of the tractor and equipped at its bottom with a pair of arms which is articulated to the backframe;lifting means provided between the pair of arms and the backframe;two forearms, one mounted on each side of the pair of arms on an articulation spindle borne by the pair of arms, each forearm comprising an attachment bracket at a first end distant from the pair of arms and, at an opposite second end to the attachment bracket, an extension beyond the articulation spindle, said extension coming to bear, in a working position, against a stop connected to the pair of arms, each forearm structured and arranged to be folded relative to the pair of arms when the device is not in use and is in a folded position;wherein:an end of the extension of each forearm away from the attachment bracket comprises a recess which is open in a direction away from the attachment bracket;the stop connected to the pair of arms comprises a transverse spindle engaged in a housing in the pair of arms, said transverse spindle being equipped, over part of its length and of its periphery, with a radial bulge consisting of at least one part attached to the transverse spindle which is a cylindrical bar;whereby when the bulge is housed in the recess, the edge of this recess is substantially in contact with the bulge and a region opposite of the transverse spindle so that each forearm is immobilized relative to the pair of arms, whereas in an angular position in which the bulge is out of the recess, a limited angular excursion of each forearm relative to the pair of arms is possible, due to a clearance between the transverse spindle and an outline of the recess.