IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0054581
(2005-02-09)
|
등록번호 |
US-7387314
(2008-06-17)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Cahill, von Hellens & Glazer, PLC
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
6 |
초록
▼
A tractor includes a motor, transmission, drive shaft and rear differential for driving the rear axles mounted on a main tubular frame of a variable configuration. Forwardly extendable telescoping tubular frame members are actuated by respective rams to selectively increase the wheel base between th
A tractor includes a motor, transmission, drive shaft and rear differential for driving the rear axles mounted on a main tubular frame of a variable configuration. Forwardly extendable telescoping tubular frame members are actuated by respective rams to selectively increase the wheel base between the front and rear wheels. The front and rear telescoping tubes supporting each of the wheels are selectively extendable to significantly increase the wheel width of the tractor; the axles for the rear wheels are commensurately extendable. A toolbar dependingly supported from the main frame in front of the cab permits the operator to view the operation of attached implements while driving. The toolbar may include a row guide causing the toolbar to move laterally as necessary to follow a row and the toolbar is connected to the steering mechanism to control the direction of travel of the tractor. The front wheels are pivotally mounted on the corresponding telescoping tubes to provide sufficient clearance to permit near 180�� pivotal movement. The steering mechanism is capable of pivoting each front wheel through an angle of about 180�� and establishes an appropriate geometric relationship between the front wheels to permit the tractor to turn about any center of rotation intersected by the common axis of rotation of the rear axle, including pivoting about either rear wheel, while maintaining the axis of rotation of each front wheel in intercepting relationship with the center of rotation. Moreover, the turn radius at the end of a row is minimal and can be further reduced by temporarily reducing the length of the frame. Various implements, including a toolbar, can be readily attached directly to the tubular frame at any location intermediate the front and rear axles, as necessary.
대표청구항
▼
I claim: 1. An agricultural tractor having first and second rear wheels and first and second front wheels, said tractor comprising in combination: a) a frame formed of square tubing; b) first and second square telescoping tubes extendible from said frame for housing an axle for each of the first an
I claim: 1. An agricultural tractor having first and second rear wheels and first and second front wheels, said tractor comprising in combination: a) a frame formed of square tubing; b) first and second square telescoping tubes extendible from said frame for housing an axle for each of the first and second rear wheels, respectively, to vary the width between the rear wheels; c) third and fourth square telescoping tubes extendible from a support secured to said frame for pivotally supporting each of the first and second front wheels, respectively to vary the width between the front wheels; and d) further telescoping tubes extendible from said frame to vary the wheel base of said tractor. 2. The agricultural tractor as set forth in claim 1 wherein said support is secured to the terminal ends of said further telescoping tubes. 3. The agricultural tractor as set forth in claim 2, including a length of square tubing pivotally secured to said support, said length of tubing being adapted to receive said third and fourth telescoping tubes. 4. An agricultural tractor having first and second rear wheels and first and second front wheels, said tractor comprising in combination: a) a frame formed of square tubing; b) first and second square telescoping tubes extendible from said frame for housing an axle for each of the first and second rear wheels, respectively, to vary the width between the rear wheels; c) third and fourth square telescoping tubes extendible from a support secured to said frame for pivotally supporting each of the first and second front wheels, respectively to vary the width between the front wheels; d) further telescoping tubes extendible from said frame to vary the wheel base of said tractor, said support being secured to the terminal ends of said further telescoping tubes; e) a length of square tubing pivotally secured to said support, said length of tubing being adapted to receive said third and fourth telescoping tubes; and f) hydraulic rams for controlling the pivotal relationship in a vertical plane between said support and said length of tubing. 5. The agricultural tractor as set forth in claim 1, including a pivot mechanism interconnecting said support with said frame for accommodating differences in elevation of said first and second front wheels. 6. An agricultural tractor having first and second rear wheels and first and second front wheels, said tractor comprising in combination: a) a frame formed of square tubing; b) first and second square telescoping tubes extendible from said frame for housing an axle for each of the first and second rear wheels, respectively, to vary the width between the rear wheels; c) third and fourth square telescoping tubes extendible from a support secured to said frame for pivotally supporting each of the first and second front wheels, respectively, to vary the width between the front wheels; d) a pivot mechanism interconnecting said support with said frame for accommodating differences in elevation of said first and second front wheels; e) hydraulic rams for causing pivotal movement of said support relative to said frame; and f) further telescoping tubes extendible from said frame to vary the wheel base of said tractor. 7. The agricultural tractor as set forth in claim 1, including a first pivot mechanism disposed at the terminal end of said third telescoping tube for supporting said first front wheel, a second pivot mechanism disposed at the terminal end of said fourth telescoping tube for supporting said second front wheel. 8. The agricultural tractor as set forth in claim 7 wherein said first and second rear wheels rotate about a common axis of rotation, wherein said first front wheel rotates about a first axis of rotation and said second front wheel rotates about a second axis of rotation and including a steering mechanism for said first and second front wheels, said steering mechanism being adapted to cause the first and second axis of rotation to intercept one another along said common axis of rotation whenever said first and second front wheels are turned left or right off dead center. 9. An agricultural tractor having first and second rear wheels and first and second front wheels, said tractor comprising in combination: a) a frame formed of square tubing; b) first and second square telescoping tubes extendible from said frame for housing an axle for each of the first and second rear wheels, respectively, to vary the width between the rear wheels; c) third and fourth square telescoping tubes extendible from a support secured to said frame for pivotally supporting each of the first and second front wheels, respectively, to vary the width between the front wheels; d) a first pivot mechanism disposed at the terminal end of said third telescoping tube for supporting said first front wheel, a second pivot mechanism disposed at the terminal end of said fourth telescoping tube for supporting said second front wheel; e) said first and second rear wheels rotating about a common axis of rotation, said first front wheel rotating about a first axis of rotation and said second front wheel rotating about a second axis of rotation and including a steering mechanism for said first and second front wheels, said steering mechanism being adapted to cause the first and second axis of rotation to intercept one another along said common axis of rotation whenever said first and second front wheels are turned left or right off dead center; f) said steering mechanism including a pivoting member, a first set of links attached to said pivoting member at a first location and interconnecting with said pivot mechanism of said first front wheel and a second set of links attached to said pivoting member at a second location and interconnecting with said second pivot mechanism of said second front wheel, said first and second locations being displaced from one another and coincident with different radials extending from the pivot axis of said pivoting member; and g) further telescoping tubes extendible from said frame to vary the wheel base of said tractor. 10. The agricultural tractor as set forth in claim 9 wherein said pivoting member is a triangular plate including three apices and having the pivot axis proximate one apex, each of said first and second sets of links being pivotally attached proximate one of the remaining apices. 11. An agricultural tractor having first and second rear wheels and first and second front wheels, said tractor comprising in combination: a) a frame formed of square tubing; b) first and second square telescoping tubes extendible from said frame for housing an axle for each of the first and second rear wheels, respectively, to vary the width between the rear wheels; c) third and fourth square telescoping tubes extendible from a support secured to said frame for pivotally supporting each of the first and second front wheels, respectively, to vary the width between the front wheels; d) first and second hydraulic rams for extending and retracting said first and second telescoping tubes and third and fourth hydraulic rams for extending and retracting said third and fourth telescoping tubes; and e) further telescoping tubes extendible from said frame to vary the wheel base of said tractor. 12. An agricultural tractor having first and second rear wheels and first and second front wheels, said tractor comprising in combination: a) a frame formed of square tubing; b) first and second square telescoping tubes extendible from said frame for housing an axle for each of the first and second rear wheels, respectively, to vary the width between the rear wheels; c) third and fourth square telescoping tubes extendible from a support secured to said frame for pivotally supporting each of the first and second front wheels, respectively, to vary the width between the front wheels; d) further telescoping tubes extendible from said frame to vary the wheel base of said tractor; and e) hydraulic rams for extending said further telescoping tubes. 13. The agricultural tractor as set forth in claim 12, including first and second hydraulic rams for extending and retracting said first and second telescoping tubes and third and fourth hydraulic rams for extending and retracting said third and fourth telescoping tubes.
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