초록 ▼

Lifting device (D) comprising a frame (4) for fixing to a tractor chassis, the frame being fitted, on its lower part, with lower securing member (A), articulated about a transverse axis and extending towards the front, with its ends capable of being coupled to the two lower fastening points of a too

Lifting device (D) comprising a frame (4) for fixing to a tractor chassis, the frame being fitted, on its lower part, with lower securing member (A), articulated about a transverse axis and extending towards the front, with its ends capable of being coupled to the two lower fastening points of a tool, and on its higher part, with a median upper securing members (16); lifting members (14) are provided between the frame (4) and lower securing members. The lower securing members (A) comprise, firstly, a lower primary structure (19), articulated at its rear part on a transverse axis (18) carried by the frame (4), and provided on the front with two longitudinal lateral extensions (21) in which a transverse bearing (26) is provided, and secondly, a forearm (29) associated with each longitudinal extension 921) and articulated about an axis (34) carried by the bearing. The forearms are independent; each (29) when in a work position, comes to rest by means of its rear part, under a stop integral with the structure (19), so as to block itself on lifting of the structure or on load raising. When the forearm (29) is free of its load, it can be folded upwards in relation to the frame (4), for a storage position. The forearm is provided, in a high position of the frame (19), with a stationary locking device to prevent both the structure and forearms from dropping, and to prevent the latter from rotating in relation to said structure.

대표청구항 ▼

Front lifting device, for an agricultural implement of the type having a chassis and a front, for hitching a tool to the front of the implement to be raised or lowered, comprising: a framework for attachment to the chassis and having a bottom having a transverse axis and lower securing means articul

Front lifting device, for an agricultural implement of the type having a chassis and a front, for hitching a tool to the front of the implement to be raised or lowered, comprising: a framework for attachment to the chassis and having a bottom having a transverse axis and lower securing means articulated about said transverse axis, said lower securing means extending forwardly relative to the front of the implement and having ends for attachment of a first and a second attachment point of a tool; said framework having a top to which is attached a middle upper securing means for connection with a third attachment point of the tool, hydraulic lifting means operable between said framework and said lower securing means to effect raising and lowering movements, said lower securing means including a primary lower structure having a rear part articulated on a transverse spindle coextending with said transverse axis and carried on said framework, said primary lower structure having a forward part including two lateral extensions each having a transverse bearing, a forearm associated with each lateral extension, an articulation spindle carried in each said bearing, each forearm having a forward and rear end and, intermediate said forward and rear ends, being articulated on a said respective articulation spindle carried in a said respective transverse bearing such that said rear end extends beyond said articulation spindle; each said hydraulic lifting means being joined to said primary lower structure and to said framework, said rear ends of said forearms bearing against a limit stop provided on said primary lower structure so as to be engaged with said limit stop during lifting of said primary lower structure and raising of a load while, when free of a load, each said forearm is movable independently of the other forearm about said articulation spindle to a folded, storage position, for locking on said framework and to prevent said primary lower structure and said forearms from rotating relative to said primary lower structure.