Coupling and lifting system for an implement, in particular an agricultural implement, that can be mounted on the front of a tractor
First Claim
1. A coupling and lifting system for an agricultural implement of the type to be attached to a three point hitch on the front of a tractor to be pushed thereby and comprising a pair of horizontally spaced arms each having one end articulated to a lower hitch point of the three ponit hitch to allow said arms to rise and descend, each said arm having an arm opposite end, each said arm opposite end having an arm hitching point, said system including an upper arm having one end and an opposite end, said one end of said upper arm being articulated to an upper hitch point of the three point hitch, said upper arm being located vertically above and between said pair of arms, said opposite end of said upper arm having an upper arm hitching point thereon, said system further including means for controlling the rise and descent of said pair of arms and said upper arm, a rigid intermediate support frame means for connection between the implement and said arms, said support frame means including two lateral bottom connection members and one middle top mounting member for hitching the implement to said support frame means, said support frame means having two lateral top connection sites spaced generally equidistant from said middle top mounting member for connection to said upper arm hitching point by arm members of variable length, said pair of arms of said system being movable independently of one another to assume different inclinations relative to a horizontal plane, said two lateral bottom connection members of said support frame means being hitched to the arm hitching points of said pair of arms, said means for controlling the rise and descent of said pair of arms comprising an hydraulic jack for each of said arms of said pair of arms, each jack having one end connected to an arm of said pair of arms and an opposite end connected to said tractor, each said jack having a chamber with the chamber of one of said jacks being connected to the chamber of the other jack by a conduit and each said chamber being supplied in parallel with fluid under pressure through conenction valve means to control flow through said conduit, said connection valve means being movable between an open and a closed position so that, with said connection valve means in said closed position, fluid may pass through said conduit from one chamber to the other chamber to allow said pair of arms to move inversely relative to each other whereby the implement and support frame means can oscillate about a virtual longitudinal axis which is equidistant from said hitching points of said pair of arms
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Accused Products
Abstract
A system includes two lower articulated longitudinal arms (6, 7) provided on their front ends with two bottom hitching points (8, 9), and an upper arm (10) in the middle, for hitching an implement at a third point; valves for controlling the rise and descent of the two lower arms and of the upper arm are provided, and the implement (3) is equipped with hitching members (11) corresponding to the three point hitch of a tractor; a rigid intermediate support frame (12) is provided for connection between the implement and the arms (6, 7, 10); the frame includes two bottom lateral points (13, 14) and one top middle point (15) for hitching the implement, and two lateral top points (16, 17) intened to be connected to the third top hitching point (10) of the tractor by connection jacks of variable length; the two lower arms (6, 7) are independent and can assume different inclinations, and the two lower lateral portions (22, 23) of the frame (12) are hitched to the two bottom points (8, 9), the assembly being such that the implement (3) and the frame (12) can oscillate about a virtual longitudinal axis (B).
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Citations
10 Claims
- 1. A coupling and lifting system for an agricultural implement of the type to be attached to a three point hitch on the front of a tractor to be pushed thereby and comprising a pair of horizontally spaced arms each having one end articulated to a lower hitch point of the three ponit hitch to allow said arms to rise and descend, each said arm having an arm opposite end, each said arm opposite end having an arm hitching point, said system including an upper arm having one end and an opposite end, said one end of said upper arm being articulated to an upper hitch point of the three point hitch, said upper arm being located vertically above and between said pair of arms, said opposite end of said upper arm having an upper arm hitching point thereon, said system further including means for controlling the rise and descent of said pair of arms and said upper arm, a rigid intermediate support frame means for connection between the implement and said arms, said support frame means including two lateral bottom connection members and one middle top mounting member for hitching the implement to said support frame means, said support frame means having two lateral top connection sites spaced generally equidistant from said middle top mounting member for connection to said upper arm hitching point by arm members of variable length, said pair of arms of said system being movable independently of one another to assume different inclinations relative to a horizontal plane, said two lateral bottom connection members of said support frame means being hitched to the arm hitching points of said pair of arms, said means for controlling the rise and descent of said pair of arms comprising an hydraulic jack for each of said arms of said pair of arms, each jack having one end connected to an arm of said pair of arms and an opposite end connected to said tractor, each said jack having a chamber with the chamber of one of said jacks being connected to the chamber of the other jack by a conduit and each said chamber being supplied in parallel with fluid under pressure through conenction valve means to control flow through said conduit, said connection valve means being movable between an open and a closed position so that, with said connection valve means in said closed position, fluid may pass through said conduit from one chamber to the other chamber to allow said pair of arms to move inversely relative to each other whereby the implement and support frame means can oscillate about a virtual longitudinal axis which is equidistant from said hitching points of said pair of arms
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3. The system as defined in calim 2, characterized in that the support frame means (12) has the form of an inverted U.
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10. A coupling and lifting system for an agricultural implement of the type to be attached to a three point hitch on the front of a tractor to be pushed thereby and comprising a pair of horizontally spaced arms each having one end articulated to a lower hitch point of the three point hitch to allow said arms to rise and descend, each said arm having an arm opposite end, each said arm opposite end having an arm hitching point, said system including an upper arm having one end and an opposite end, said one end of said upper arm being articulated to an upper hitch point of the three point hitch, said upper arm being located vertically above and between said pair of arms, said opposite end of said upper arm having an upper arm hitching point thereon, said system further including means for controlling the rise and descent of said pair of arms and said upper arm, a rigid intermediate support frame means for connection between the implement and said arms, said support frame means including two lateral bottom connection members and one middle top mounting member for hitching the implement to said support frame means, said support frame means having two lateral top connection sites spaced generally equidistant from said middle top mounting member for connection to said upper arm hitching point by arm members of variable length, said pair of arms of said system being movable independently of one another to assume different inclinations relative to a horizontal plane, said two lateral bottom connection members of said support frame means being hitched to the arm hitching points of said pair of arms, said means for controlling the rise and descent of said pair of arms comprising an hydraulic jack for each of said arms of said pair of arms, each jack having one end connected to an arm of said pair of arms and an opposite end connected to said tractor, each said jack having a chamber with the chamber of one of said jacks being connected to the chamber of the other jack by a conduit and each said chamber being supplied in parallel with fluid under pressure through conenction valve means to control flow through said conduit, said connection valve means being movable between an open and a closed position so that, with said connection valve means in said closed position, fluid may pass through said conduit from one chamber to the other chamber to allow said pair of arms to move inversely relative to each other whereby the implement and support frame means can oscillate about a virtual longitudinal axis which is equidistant from said hitching points of said pair of arms, said intermediate support frame means having an upper crossbar and the lateral top connection sites of the intermediate support frame means being provided on an independent bar affixed to said upper crossbar of said intermediate support frame means.
Specification