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.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A field-sequential type display device for performing color display by switching a plurality of emission colors of a light source with passage of time and synchronizing light emission timing of each emission color with an input of pixel data of each emission color corresponding to an image to be displayed, comprising:
an adder unit for creating summed pixel data by adding addition data to pixel data of each emission color inputted according to the image to be displayed; and
a display unit for receiving an input of the summed pixel data from said adder unit and performing color display by synchronizing the light emission timing of each emission color with the input of the summed pixel data.
2. The display device of claim 1, further comprising a switching unit for performing switching between color display performed based on the pixel data inputted according to the image to be displayed and color display performed based on the summed pixel data obtained by said adder unit.
3. The display device of claim 2, further comprising:
a measuring unit for measuring ambient illuminance; and
a control unit for controlling switching performed by said switching unit, based on a result of measurement obtained by said measuring unit.
4. The display device of claim 2, further comprising:
a storage unit for storing a plurality of kinds of data of mutually different levels for use as the addition data; and
a selecting unit for selecting one kind of data from the plurality of kinds of data stored by said storage unit.
5. The display device of claim 4, further comprising:
a measuring unit for measuring ambient illuminance; and
a control unit for controlling selection performed by said selecting unit, based on a result of measurement obtained by said measuring unit.
6. The display device of claim 2,
wherein the addition data is substantially white achromatic data.
7. The display device of claim 2, further comprising an intensity control unit for controlling intensities of the plurality of emission colors of the light source.
8. The display device of claim 2, further comprising a converting unit for creating converted pixel data by converting the inputted pixel data, according to the addition data,
wherein the addition data is added to the converted pixel data by said adder unit.
9. The display device of claim 1, further comprising:
a storage unit for storing a plurality of kinds of data of mutually different levels for use as the addition data; and
a selecting unit for selecting one kind of data from the plurality of kinds of data stored by said storage unit.
10. The display device of claim 9, further comprising:
a measuring unit for measuring ambient illuminance; and
a control unit for controlling selection performed by said selecting unit, based on a result of measurement obtained by said measuring unit.
11. The display device of claim 9,
wherein the addition data is substantially white achromatic data.
12. The display device of claim 9, further comprising an intensity control unit for controlling intensities of the plurality of emission colors of the light source.
13. The display device of claim 9, further comprising a converting unit for creating converted pixel data by converting the inputted pixel data, according to the addition data,
wherein the addition data is added to the converted pixel data by said adder unit.
14. The display device of claim 1,
wherein the addition data is substantially white achromatic data.
15. The display device of claim 1, further comprising an intensity control unit for controlling intensities of the plurality of emission colors of the light source.
16. The display device of claim 1, further comprising a converting unit for creating converted pixel data by converting the inputted pixel data, according to the addition data,
wherein the addition data is added to the converted pixel data by said adder unit.
17. The display device of claim 1, further comprising a detecting unit for detecting whether a level of the pixel data to be inputted is not more than a predetermined level,
wherein, when the level of the inputted pixel data is not more than the predetermined level, addition of the addition data is not performed by said adder unit.