[미국특허]
Three-point front hitch mountable to the frame of an agricultural tractor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A01B-059/04
E02F-003/00
출원번호
US-0959464
(2010-12-03)
등록번호
US-8555995
(2013-10-15)
발명자
/ 주소
Harris, Jerry
출원인 / 주소
Harris, Jerry
대리인 / 주소
Fox, III, Angus C.
인용정보
피인용 횟수 :
5인용 특허 :
22
초록▼
A three-point hitch mountable to the front frame of an agricultural tractor includes a main backing member, an upper hitch-point anchor bracket having four sets of securing pin anchoring positions that is welded to the main backing member, a pair of spaced-apart pivot anchors welded to the main back
A three-point hitch mountable to the front frame of an agricultural tractor includes a main backing member, an upper hitch-point anchor bracket having four sets of securing pin anchoring positions that is welded to the main backing member, a pair of spaced-apart pivot anchors welded to the main backing member, an A-frame assembly pivotably installed between the pivot anchors, and a hydraulic cylinder which raises and lowers the A-frame assembly operably coupled to one of the middle sets of pin anchoring positions and the A-frame assembly. An implement can be connected to the upper-most anchoring position and the distal ends of the A-frame assembly. The three-point hitch can be converted to a ball hitch by re-pinning the hydraulic cylinder to the uppermost anchoring position, raising the A-frame assembly about ninety degrees and pinning it to the anchor bracket.
대표청구항▼
1. A three-point front hitch mountable to a front portion of a frame of an agricultural tractor, said three-point hitch comprising: a main backing member securable to said front portion;an upper hitch-point anchor bracket formed from a first pair of parallel, spaced-apart plates, which are secured t
1. A three-point front hitch mountable to a front portion of a frame of an agricultural tractor, said three-point hitch comprising: a main backing member securable to said front portion;an upper hitch-point anchor bracket formed from a first pair of parallel, spaced-apart plates, which are secured to the main backing member, said upper hitch-point anchor bracket providing an upper hitch attachment point for the securing of an upper implement attachment link;an A-frame assembly pivotally coupled to the main backing member, said A-frame assembly having a pair of arms which distally diverge, each arm having an implement pivot bushing at its distal end, the implement pivot bushing of each arm being coaxial with the implement pivot bushing of the other arm, said arms having a generally horizontal position when a three-attachment-point implement is secured to the hitch;a hydraulic cylinder coupled between the upper hitch-point bracket and the A-frame assembly, said hydraulic cylinder operable to rotate the A-frame assembly through an arc, thereby raising or lowering the implement pivot bushing thereof; anda hitch receiver affixed to said A-frame assembly, said hitch receiver projecting downwardly when said A-frame assembly is in a generally horizontal position;wherein at least one coupling end of said hydraulic cylinder is pinned to at least one oblong aperture, which provides an amount of play for the A-frame assembly so that an implement mounted to the hitch has a degree of float for accommodating a certain amount of non-planarity of soil over which the mounted implement travels. 2. The three-point front hitch of claim 1, wherein an upper end of said hydraulic cylinder can be pinned to the upper hitch attachment point when an implement is not coupled to the A-frame assembly so that the A-frame assembly can be rotated to a generally vertical position, thereby elevating the hitch receiver to a generally horizontal position for reception of a hitch. 3. The three-point hitch of claim 2, which further comprises a hydraulic cylinder mounting bracket to which the distal end of a slidable piston rod of the hydraulic cylinder is attached and to which the hitch receiver is also secured. 4. The three-point front hitch of claim 3, wherein said hydraulic cylinder mounting bracket can be pinned to the upper hitch-point anchor bracket when the A-frame assembly is in a generally vertical position. 5. The three-point front hitch of claim 1, wherein said A-frame assembly comprises: a pivot tube to which each of the arms is welded;a brace plate, which is spaced from the pivot tube and welded to each of the arms; anda hydraulic cylinder mounting bracket, which is welded to both the pivot tube and to the brace plate. 6. The three-point hitch of claim 5, wherein said A-frame assembly further comprises a receiver mounting plate that is welded to the hydraulic cylinder mounting bracket and to the pivot tube; and wherein said hitch receiver is welded to the receiver mounting plate, the pivot tube and to the brace plate; andwherein said hitch receiver is positioned generally orthogonal to a plane passing through an axis of the pivot tube and each of the implement pivot bushings. 7. The three-point hitch of claim 5, which further comprises a pair of spaced-apart pivot anchors welded to the main backing member, the pivot tube of said A-frame assembly being rotatably pinned between said pivot anchors by an A-frame assembly pivot rod. 8. The three-point hitch of claim 1, wherein said main backing member is fabricated from a main plate provided with bolt holes for securing the main backing member to the front frame portion of a tractor, a top plate, and a bottom plate, said backing member forming a channel which fits over the front frame portion. 9. The three-point hitch of claim 1, wherein an upper end of said hydraulic cylinder is pinned between a pair of oblong apertures in the spaced-apart plates forming the upper hitch-point anchor bracket. 10. The three-point hitch of claim 9, wherein said each of the spaced-apart plates forming the upper hitch-point anchor bracket if provided with multiple oblong apertures so that mounting of an upper end of the hydraulic cylinder is vertically adjustable. 11. A three-point front hitch mountable to a front portion of a frame of an agricultural tractor, said three-point hitch comprising: a main backing member securable to said front portion;an upper hitch-point anchor bracket formed from a first pair of parallel, spaced-apart plates, which are secured to the main backing member, said upper hitch-point anchor bracket providing an upper hitch attachment point for the securing of an upper implement attachment link;a pair of spaced-apart pivot anchors welded to the main backing member;an A-frame assembly having a pivot tube to which each of the arms is welded, a brace plate, which is spaced from the pivot tube and welded to each of the arms, and a hydraulic cylinder mounting bracket formed from a second pair of parallel, spaced-apart plates welded to both the pivot tube and to opposite ends of the brace plate; anda hydraulic cylinder coupled between the upper hitch-point bracket and the A-frame assembly, said hydraulic cylinder operable to rotate the A-frame assembly through an arc, thereby raising or lowering the implement pivot bushing thereof;wherein the arms of the A-frame assembly diverge as they distally extend from the pivot tube, each arm having an implement pivot bushing at its distal end, the implement pivot bushing of each arm being coaxial with the implement pivot bushing of the other arm, said arms having a generally horizontal position when a three-attachment-point implement is secured to the hitch, and said pivot tube being rotatably pinned between said pivot anchors by an A-frame assembly pivot rod; anda hitch receiver affixed to said A-frame assembly, said hitch receiver projecting downwardly when said A-frame assembly is in a generally horizontal position;wherein at least one coupling end of said hydraulic cylinder is pinned to at least one oblong aperture, which provides an amount of play for the A-frame assembly so that an implement secured to the hitch has a degree of float for accommodating a certain amount of non-planarity of soil over which the mounted implement travels. 12. The three-point front hitch of claim 11, wherein an upper end of said hydraulic cylinder can be pinned to the upper hitch attachment point when an implement is not coupled to the hitch in order to move the A-frame assembly to a generally vertical position, thereby elevating the hitch receiver to a generally horizontal position for reception of a hitch. 13. The three-point hitch of claim 11, wherein said A-frame assembly further comprises a receiver mounting plate that is welded to the hydraulic cylinder mounting bracket and to the pivot tube; and wherein said hitch receiver is welded to the receiver mounting plate, to the pivot tube and the brace plate; andwherein said hitch receiver is positioned generally orthogonal to a plane passing through an axis of the pivot tube and an axis of both implement pivot bushings. 14. The three-point front hitch of claim 13, wherein an upper end of said hydraulic cylinder can be pinned to the upper hitch attachment point when an implement is not coupled to the hitch in order to move the A-frame assembly to a generally vertical position, thereby elevating the hitch receiver to a generally horizontal position for reception of a hitch. 15. The three-point hitch of claim 11 wherein an upper end of said hydraulic cylinder is pinned between a pair of oblong apertures in the spaced-apart plates forming the upper hitch-point anchor bracket. 16. The three-point hitch of claim 15 wherein said each of the spaced-apart plates forming the upper hitch-point anchor bracket if provided with multiple oblong apertures so that mounting of an upper end of the hydraulic cylinder is vertically adjustable. 17. The three-point hitch of claim 12, wherein said hydraulic cylinder mounting bracket can be pinned to the upper hitch-point anchor bracket when the A-frame assembly is in a generally vertical position. 18. The three-point hitch of claim 11, wherein said main backing member is fabricated from a main plate provided with bolt holes for securing the main backing member to the front frame portion of a tractor, a top plate, and a bottom plate, said main backing member forming a channel which fits over the front frame portion.
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