US3666178A

US3666178A - Field-treating device

Info

Publication number: US3666178A
Application number: US85529A
Authority: US
Inventors: Arthur G Crimmins; Donald B Doolittle
Original assignee: All American Industries Inc
Current assignee: All American Industries Inc
Priority date: 1970-10-30
Filing date: 1970-10-30
Publication date: 1972-05-30
Anticipated expiration: 1989-05-30

Abstract

An elongated canopy approximately 50 feet long and about 10 feet wide is driven widthwise over a field on wheels of adjustable height. Air circulating fans are mounted under the canopy along its longitudinal axis pointing in the direction of movement of the canopy. Crop-treating substances, such as wet or dry chemicals, are ejected under the canopy and intermixed with the circulating air currents. The canopy substantially confines the circulating mixture and applied substance to the portion of the field substantially under it. Adjustable auxiliary lift surfaces and air inlet means may be provided on the canopy to help support its weight above the ground or to responsively control the footprint pressure and attitude of the device. A dual canopy may thus be joined by an auxiliary lift surface. A control console is mounted on a longitudinal center of the canopy. It is rotatable for driving in both directions without turning the entire device around. A pair of tandem driving wheels are mounted in the center of the canopy and freely rotatable castered outrigger wheels are spaced on both sides of the center driving wheels.

Description

United States Patent Crimmins et al.

[151 3,666,178 [451 May 30,1972

[54] FIELD-TREATING DEVICE [73] Assignee: All American Industries, Inc., Wilmington,

Del.

[22] Filed: Oct. 30, 1970 [21] Appl. No.: 85,529

FOREIGN PATENTS OR APPLICATIONS 1,512,387 2/1968 France ..239/l72 1,096,027 12/1967 Great Britain ..239/ l 50 Primary ExaminerM. Henson Wood. Jr.

Assistant ExaminerEdwin D. Grant Attorney-Connolly and Hut:

[5 7] ABSTRACT An elongated canopy approximately 50 feet long and about 10 feet wide is driyen widthwise over a field on wheels of adjustable height. Air circulating fans are mounted under the canopy along its longitudinal axis pointing in the direction of movement of the canopy. Crop-treating substances, such as wet or dry chemicals, are ejected under the canopy and intermixed with the circulating air currents. The canopy substantially confines the circulating mixture and applied substance to the portion of the field substantially under it. Adjustable auxiliary lift surfaces and air inlet means may be provided on the canopy to help support its weight above the ground or to responsively control the footprint pressure and attitude of the device. A dual canopy may thus be joined by an auxiliary lift surface. A control console is mounted on a longitudinal center of the canopy. It is rotatable for driving in both directions without turning the entire device around. A pair of tandem driving wheels are mounted in the center of the canopy and freely rotatable castered outrigger wheels are spaced on both sides of the center driving wheels.

26 Claims, 16 Drawing Figures PATENTEDMAYBO 1972 3 666,178 sum 1 or a PATENTEDMAYBO 1972 SHEET 30F 3 BACKGROUND OF THE INVENTION This invention relates to a device for treating an agricultural field with chemical substances and more particularly relates to such a device with air circulating means. Various airborne devices have been proposed for treating fields and crops with chemical substances, such as pesticides and insecticides. Airplanes, helicopters and ground efiect vehicles have been accordingly used. These airborne devices spread chemicals quite rapidly but generate strong air current which disperse the chemicals widely throughout the surrounding area. These airborne devices are also relatively expensive to buy and operate and require licensed pilots. An object of this invention is to provide a device for treating fields and crops which is relatively inexpensive in structure and operation and which confines the treating substances to a predetermined area. Another object is to provide such a device which does not require a licensed operator.

SUMMARY An elongated canopy having a length extending over several rows of crops and a width of at least several feet is driven widthwise over a field of crops. A control unit (central for example) controls the direction and speed of movement of vertically adjustable wheels. Air circulators are mounted under the canopy for generating air currents which entrain the croptreating substance ejected under it and which are confined upon the portion of the field directly under the canopy. The canopy may be arranged to react against the air currents for generating lift to help support its weight or to responsively control the footprint pressure and attitude of the device. Alternative auxiliary lift surfaces and air inlets may thus be provided. A pair of tandem elongated canopies connected by a lift suface can generate substantial lift for soft fields. A bidirectional control console can drive the device in opposite directions without turning it around. The canopy may include several detachable sections to facilitate transportation from one location to another.

BRIEF DESCRIPTION OF THE DRAWINGS Novel features and advantages of the present invention will become apparent to one skilled in the art from a reading of the following description in conjunction with the accompanying drawings wherein similar reference characters refer to similar parts and in which:

FIG. 1 is a three-dimensional pictorial view of one embodiment of this invention;

FIG. 2 is a front view in elevation of the embodiment shown in FIG. 1 in conjunction with a field of crops being treated thereby;

FIG. 3 is a top plan view of the embodiment shown in FIGS. 1 and 2;

FIG. 4 is a right-hand end view of the embodiment shown in FIGS. 1-3;

FIG. 5 is a three-dimensional pictorial view of one portion of the embodiment shown in FIG. 1 with outer covering material removed;

FIG. 6 is a cross-sectional view taken through FIG. 2 along the line 6-6;

FIG. 7 is a front view in elevation of an adjustable driving wheel of the embodiment shown in F IG. 1;

FIG. 8 is a top plan view of the adjustably driving wheel shown in FIG. 7;

FIG. 9 is a front view in elevation of a portion of an adjustable outrigger wheel of the embodiment shown in FIG. 1;

FIG. 10 is a schematic diagram of the steering and driving hydraulic system for the embodiment shown in FIG. 1;

FIG. 11 is a three-dimensional pictorial view of another embodiment of this invention;

FIG. 12 is a cross-sectional view taken through a canopy portion of the embodiment shown in FIG. 1 1;

FIG. 13 is a three-dimensional pictorial view of a further embodiment of this invention;

FIG. 14 is a cross-sectional view taken through a canopy portion of the embodiment shown in FIG. 13;

FIG. 15 is a cross-sectional view of a modified canopy portion of the embodiment shown in FIG. 13; and

FIG. 16 is a schematic front view in elevation of a still further embodiment of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT In FIGS. l-4 is shown field-treating device 10 for applying to a field 12 of crops (such as corn shown in FIG. 2) a mixture 14 of air and chemicals such as insecticide. Device 10 includes an elongated canopy 16 about 50 feet long extending over several rows of crops 12 and a width of about 4 feet.

Device 10 includes mobile traction means 18 incorporating a pair of tandem steering and driving wheels 20 and two pairs of tandem free swivelling outrigger wheels 22. Wheels 20 are mounted on rotatable and vertically adjustable legs 24 in bearing assemblies 26, later described in detail in conjunction with FIGS. 7 and 8. Full castering outrigger wheels 22 are mounted on legs 28 which are vertically adjustable in support tubes 30 as later described in detail in conjunction with FIG. 9.

Canopy 16 includes an elongated frame 32 covered by an air-resistant sheet material 34, which is for example tightly woven canvas. Canopy 16 includes for example several sections 36 as shown in FIG. 5. Device 10 shown in FIG. 1 has four of such sections connected to each other at joints 38, which are detachable from each other to facilitate transportation of device 10 from one location to another. Sections 36 are for example connected to each other by suitable connectors such as nuts and bolts or quick coupling devices (not shown). Central sections 36 may fold upwardly for transportation as later described in conjunction with FIG. 16.

Control console 40 is mounted on a center portion of device 10 on top of control unit 42. Canopy sections 36 are connected on both sides of control unit 42. Control unit 42 includes a power unit 44 and a chemical storage tank 46. Power unit 44 includes an internal combustion engine and an electric generator (both not shown) and a hydraulic system 48 described in detail in FIG. 10. Control console 40 is bidirectional by virtue of turret 50 to permit device 10 to be driven back and forth without turning it completely around. An operator 52 can thus remain seated in control console 40, and alternately drive unit 10 in opposite directions without leaving his seat.

Distributing tube 54 is connected to storage tank 46 and it extends under canopy 16 as shown in FIGS. 5 and 6. Distributing tube 54 is mounted in front of air circulator 56 which includes fans 58 mounted along the longitudinal axis 60 of canopy 16. Fans 58 are disposed in a direction normal to axis 60 or in the widthwise direction of movement of device 10. Fans 58 are rotated by electrical motors 62, which may be connected to the generator and power unit 44 in a conventional manner (not shown).

FIG. 6 shows the circulation of air currents in the direction of arrows 64 in response to rotation fans 58 under canopy 16. Air currents symbolized by arrows 64 are substantially confined within the portion of field 66 substantially under canopy 16 to accordingly confine the chemicals applied under canopy 16.

FIGS. 7 and 8 show the details of control drive and steering leg 20 within bearing support 26. Leg 20 passes through bearing sleeves 80 having a slot 82 for receiving rack 84. Pinion 86 driven by hydraulic motor 88 moves rack 84 and leg 20 up and down through bearing sleeves to adjust the vertical disposition of leg 20. Motor 88 rotates together with one of bearing sleeves 80. Bearings sleeves 80 are mounted in fixed bearings supports 90 connected to frame 92 of control unit 42. The angular orientation of leg 20 is controlled by pinion 94 driven by hydraulic motor 95. Pinion 94 engages bevel gear 96 concentrically mounted on leg 20. Rotation of wheel 98 mounted in yoke 100 at the bottom of leg 20 is accomplished by hydraulic motor 102 connected by tubes 104 to hydraulic system 48 shown in FIG. 10.

FIG. 9 shows outrigger wheel assembly 22 including leg 28 mounted in support tube 30. Leg 28 is vertically adjustable relative to support tube 30 by movement of pinion 106 against rack 108 in response to rotation of hydraulic motor 110. Wheel 112 is mounted in full swivelling castered yoke 114 at the bottom of leg 28.

FIG. 10 shows hydraulic system 48 which includes a positive pressure pump 116 of a type suitable for hydraulic control operation, such as a gear pump. Pump 116 is driven by internal combustion engine 44 to supply hydraulic pressure to reservoir 118. Reservoir 118 supplies hydraulic fluid under pressure to motors 45, 1 10, 88, 95 and 102 for controlling the hydraulic motors for the various steering and adjustment functrons indicated in legends on FIG. 10. Actuation of these hydraulic motors, is controlled by

suitable valves

120, 122, 124 and 126. Valve 128 is relief valve. The one remaining valve 130D controls cylinder 132D (shown in FIG. 16) which helps fold the center canopy sections 36D upwardly on hinges 133D about center control section 42D to facilitate road transportation.

FIGS. 11 and 12 show a modified device 10A which differs from device 10 in that a portion of sheet material 34A is removed from front section 68A of canopy 16A to provide an air inlet means. Section 68A is uncovered by moving flap 70A from over it to cover lower section 72A of canopy 16A in front of fan 58A. Trailing flap 74A is also provided by folding it down from its retracted position shown in phantom outline against the rear section of canopy 16A.

Flaps

70A and 74A provide auxiliary lift surfaces or planes which react against air currents 64A to help support the weight of device 10A. This is particularly advantageous in a muddy field, which might not even support the weight of a person.

FIG. 13 shows another type 10B of crop-treating device including a tandem pair of canopy sections 16B connected by an auxiliary lifting flap 748. Device 108 is similar to device 10 in all other respects.

FIG. 14 shows the path of air currents 64B which react upwardly against auxiliary lifting surface or plane 748 to help support the weight of device 108.

FIG. 15 shows a modified device 10C similar to that shown in FIGS. 13 and 14 with the exception that inner canopy sections 76C are removed and folded over the front canopy sections to thus provide open air inlets 78C into the adjacent canopy sections of the tandem pair. Arrows 64C illustrate the air currents directed against the adjacent portion of ground 66C, which help support device 10C. The magnitude of these lifting forces will be later described in detail.

FIG. 16 is a schematic front elevational view of a still further form of this device 10D having hydraulic cylinder 132D for folding center canopy sections 36D upwardly about control section 42D on hinges 133D for transportation.

OPERATION Devices

10, 10A, 10B, 10C and 10D all are similar to device 10 with respect to application of a chemical to a field of crops 12 and such operation is thus described for all in conjunction with device 10 shown in FIGS. l-10. A chemical such as an insecticide is distributed under canopy 16 through distributing tubing 54 from storage container 46. The chemical is mixed with air by fans 58 which generate circulating air currents 64. Air currents 64, shown in FIG. 6, are confined substantially between canopy l6 and the portion 66 of field 12 under it. The normal downdraft provided by air currents 64 is approximately 20 miles per hour (30 feet per second) or even less. This is slow enough to avoid the likelihood of damage to the crops.

This confinement of the air currents increases the efficiency of the application and thus lowers the cost of chemical needed per acre and also reduces dispersion to the surrounding area to practically nothing. Environmental pollution is therefore greatly minimized. This reduces the cost of operation of this device to approximately 30 cents per acre in comparison to the cost of cenm and one dollar per acre for conventional ground application equipment and fixed wing aircraft.

Device 10 is extremely rapid in operation because it covers a swath as long as the canopy, for example 50 feet. It can travel at speeds up to 20 miles per hour in the illustrated 4 feet wide configuration. Unit 10 is fully ground supported and is thus stable even under windy conditions.

Unit 10A shown in FIGS. 11 and 12 is modified to provide some lift to help support the device over soft fields such as under muddy conditions. Its air velocity is increased over device 10, but is still effective at air velocities of less than 30 feet per second (20 miles per hour). The configuration of FIG. 11 is achieved from FIG. 1 by folding forward canopy flap 70A down under the front end of canopy 16 while the rear flap 74A is extended byfolding it down from its retracted phantom position against the rear of canopy 16A shown in FIG. 12.

Device 108 (shown in FIGS. 13 and 14) is a tandem unit providing substantial lift for very poor field conditions. The air velocity ranges up to 30 feet per second (20 miles per hour) similarly to unit 10A. A comparison of aerodynamic horsepower and footprint pressures for device 10 is shown in following Table A. The footprint area is the area of wheel contact.

Device 10C shown in FIG. 15 is formed from device 108 to augment its lift characteristics by folding flaps 76C from adjacent canopy portions 77G to provide air inlets 78C, which direct circulating currents 64C against the ground 66C under device 10C and outwardly therefrom.

Device 10D shown in FIG. 16 folds central canopy sections 36D upwardly about centrol control unit 42D to facilitate rotability of the folded center unit. Outer canopy sections 36D (not shown) are previously detached and are, for example transported on flat bed truck.

For purposes of Table A: Velocity (ZS/0.002378; and Hp V Perimeter Height X 5/550);

TABLE A S Wing loading Total Horse- Footprint V (velocity) (lbs. per lift power (lbs. per feet per sec. M.p.h. sq. ft.) (lbs) required sq. in.)

The above table is based on the conservative assumption that the 3,500 pound vehicle is operating at a 4 foot height over bare ground. This provides maximum horsepower requirement because the considerable resistance to the flow of air offered by the crops being treated is disregarded.

Because of the lift inherent in the design of the invention, device 10B can travel in fields that a man could only traverse with considerable difficulty. The footprint pressure with a downdraft of 20 mph is roughly half that of a walking may and about 75 percent of the average crawler type farm tractor. With application of full power, device 10B can reduce its footprint pressure to near zero for travel over particularly bad spots or ditches.

All controls, steering, drive and brakes are applied through the supporting wheels. No special talent other than the ability to drive a tractor is required. The quantity of chemical desired per acre is preset into the dispensing system prior to actual spreading. This adjustment is theoretically the same as adjusting the orifice of a common lawn spreader.

The actual metering and control system for chemical application may incorporate a small, very inexpensive analog computer (not shown) that will compute actual ground covered (as measured by wheel rotation) against the operator's control (set for the desired amount of chemical per acre). Thus, the only action then required of the operator is the setting of a knob to a number corresponding to the desired coverage per acre, and this amount of chemical will be automatically dispersed regardless of speed of the vehicle.

The illustrated design is completely modular. The basic machine consists of a power and control module, and two or more wing sections. A single wing module is shown in FIG. 5. FIGS. 11 through show various possible configurations to illustrate some of the ways the basic design can be assembled by the user to allow for changing conditions of operation.

When arranged as shown in FIGS. l-6, the maximum chemical application efficiency is obtained. When firm, dry field conditions exist permitting a footprint pressure of a normal tractor, this configuration re-ingests practically all of the chemical-laden air with a major increase in the efiiciency of application. Estimated savings range up to 50 percent of the cost of chemicals as compared to current practices.

As shown in FIGS. 11 and 12, a slight modification to the basic module provides a moderate lift, reducing the footprint pressure considerably for softer field conditions.

FIGS. 13 and 14 illustrate a double system, truly bidirectional, that provides considerable lift with the re-ingestion features of FIGS. 1-6. This design will allow a low footprint pressure for use in very poor field conditions. This design represents perhaps the best compromise.

The FIG. 15 configuration provides the most lift, but there is relatively little re-ingestion, so the application confinement will be lower than FIGS. 1-6, 11-12. The FIG. 15 configuration also does not attempt to control ground dust generation. The primary feature of FIG. 15 of benefit, is the added lift. This requirement might be needed over very muddy fields (where ground dust would not exist) and would permit use of the machine where even a walking man would find his progress painfully slow. It is certainly conceivable that the mechanical system could be arranged so that the operator could change from FIG. 14 to FIG. 15 while in full operation over the field as previously described. Thus, FIG. 14 would be normal, with FIG. 15 used only over ditches, muddy spots, or other cases where high lift and virtually zero footprint pressure would be required.

Under unstable conditions, such as in a high or gusty wind or on uneven terrain, it is advantageous to generate a negative lift to control the attitude of the device to hold it in position relative to the ground. This is easily accomplished by rotating air circulator 56 in reverse, which would reverse the direction of fans 58 and illustrated air currents 64. A negative lift or any desired degree of negative or positive lift can also be obtained by an adjustable attitude airfoil, such as airfoil 135C shown in solid outline in FIG. 15, rotatably mounted on pivot 137C in the path of air currents 64C. The illustrated solid outline position of airfoil 135C is neutral and does not generate any lift because it is substantially aligned with air currents 64C.

The phantom disposition of airfoil 135CX reacts with air currents 64C to generate a negative lift which urges canopy 16C towards the ground and thus helps control the attitude of device 10C. Quick operating controls, such as a stick control, can be provided to enable an operator to rapidly adjust airfoil 135C to counteract the effects of gusts of wind.

The general construction would combine rugged and familiar tractor systems with lightweight, easily repairable (or inexpensively replaceable) modules and fabric, with an estimated gross weight of 3,500 lbs. or slightly less.

Since this is a ground surface machine, 24-hour operations are possible. Its use at night would take maximum advantage of low wind conditions, the existence of dew on plants for even more efiective chemical application efficiency, more comfortable operating temperature and greatly decreased overall costs of operation.

General performance conditions would be approximately as follows:

Application Ground Speed mph maximum Application Control-Linked to drive system for direct area measurement.

What is claimed is:

l. A device for applying to a field mixtures of treating substances and air comprising a canopy extending over several rows of crops, mobile traction means connected below said canopy for traversing it over the ground, drive means connected to said device for causing it to move over the ground, a control unit connected to said drive means for guiding the direction and speed of movement of said device, distributing means for said treating substance connected to said device for ejecting said substance under said canopy, air propelling means on said device for generating air currents under said canopy and towards the portion of said field under said canopy for mixing and entraining said treating substance with said air for distribution and substantial confinement to the portion of said field substantially under said canopy, said mobile traction means being elongated to hold said canopy a substantial height above the ground, and said canopy and air propelling means being constructed and arranged for generating a substantial flow of air within and out of said canopy for causing a substantial force reaction by said canopy at said height on said mobile traction means whereby the footprint pressure and attitude of said canopy are responsively controlled.

2. A device as set forth in claim 1 wherein said canopy comprises an elongated frame and a substantially air resistant sheet material upon an upper portion of said frame.

3. A device as set forth in claim 1 wherein said canopy comprises an elongated frame, a substantially air resistant sheet material upon an upper portion of said frame, air inlet openings through portions of said sheet material whereby currents of air are directed relative to said canopy whereby a substantial force reaction is generated to help control the footprint pressure and attitude of said device.

4. A device as set forth in claim 1 wherein said control unit is connected to said canopy, and driving controls in said control unit whereby the speed and direction of movement of said device is controlled.

5. A device as set forth in claim 1 wherein said mobile traction means comprises wheels connected below said canopy on adjustable supports for holding said canopy an adjustable distance above said field.

6. A device as set forth in claim 5 wherein said supports comprise telescopic rods.

7. A device as set forth in claim 1 wherein said control unit is disposed substantially in the longitudinal center of said canopy with said canopy extending laterally on each side of said control unit, a pair of tandem outrigger wheels spaced below said canopy a distance on each side of said control unit to prevent lateral rocking of said device, and a pair of tandem driving wheels mounted beneath said control unit.

8. A device as set forth in claim 7 wherein said control means includes driving controls, swivelling means connected to said wheels and said driving controls being connected to said swivelling means by a control linkage.

9. A device as set forth in claim 8 wherein said control linkage is of the hydraulic type.

10. A device as set forth in claim 1 wherein said canopy includes several detachable sections whereby transportation from one location to another is facilitated.

11. A device as set forth in claim 1 wherein a control console is included in said control unit, a storage means for said crop-treating substance is mounted on said device, and a discharge control means on said storage means and operable from said control console.

12. A device as set forth in claim 1 wherein said control unit includes a control console, and said control console being two-directional to permit said device to be driven in opposite directions without turning it around.

13. A device as set forth in claim 1 wherein said canopy is elongated having a length extending over several rows of crops and a width of at least several feet.

14. A device as set forth in claim 13 wherein said drive means causes said device to move widthwise over the ground in a direction substantially perpendicular to its length.

15. A device as set forth in claim 1 wherein said air propelling means comprises air circulating means.

16. A device as set forth in claim wherein said air circulating means and said canopy means are constructed and arranged to recirculate a substantial amount of said mixtures.

17. A device for applying to a field mixtures of treating substances and air comprising a canopy extending over several rows of crops, mobile traction means connected below said canopy for traversing it over the ground, drive means connected to said device for causing it to move over the ground, a control unit connected to said drive means for guiding the direction and speed of movement of said device, distributing means for said treating substance connected to said device for ejecting said substance under said canopy, air propelling means on said device for generating air currents under said canopy and towards the portion of said field under said canopy for mixing and entraining said treating substance with said air for distribution and substantial confinement to the portion of said field substantially under said canopy, and said air propelling means comprises a number of fans vertically mounted within said canopy along its longitudinal axis, and the axes of said fans being disposed normal to said longitudinal axis of said canopy.

18. A device for applying to a field mixtures of treating substances and air comprising a canopy extending over several rows of crops, mobile traction means connected below said canopy for traversing it over the ground, drive means connected to said device for causing it to move over the ground, a control unit connected to said drive means for guiding the direction and speed of movement of said device, distributing means for said treating substance connected to said device for ejecting said substance under said canopy, air propelling means on said device for generating air currents under said canopy and towards the portion of said field under said canopy for mixing and entraining said treating substance with said air for distribution and substantial confinement to the portion of said field substantially under said canopy, and an auxiliary lift surface is connected to said canopy which is constructed and arranged for reacting with said air propelling means to generate a force reaction for helping control the footprint pressure and attitude of said device.

19. A device as set forth in claim 18, wherein said auxiliary lift surface comprises plane means upon a lower portion of said canopy.

20. A device as set forth in claim 19, wherein air inlet means is disposed in a portion of said canopy for causing a current of air to react against said plane means.

21. A device as set forth in claim 20 wherein said canopy includes movable sections which are constructed and arranged to form said air inlet and said plane means.

22. A device as set forth in claim 18 wherein a pair of said elongated canopies are disposed one behind the other in a direction substantially normal to said canopy, and said auxiliary lift means is disposed between said canopies.

23. A device as set forth in claim 22 wherein air inlet means is disposed in said canopy for reacting against said auxiliary lift surface.

24. A device for applying to a field mixtures of treating substances and air comprising a canopy extending over several rows of crops, mobile traction means connected below said canopy for traversing it over the ground, drive means connected to said device for causing it to move over the ground, a control unit connected to said drive means for guiding the direction and speed of movement of said device, distributing means for said treating substance connected to said device for ejecting said substance under said can py. air propelling means on said device for generating air currents under said canopy and towards the portion of said field under said canopy for mixing entraining said treating substance with said air for distribution and substantial confinement to the portion of said field substantially under said canopy, and said canopy and said air propelling means are constructed and arranged for generating a negative lifting reaction on said device to help control its attitude.

25. A device for applying to a field mixtures of treating substances and air comprising a canopy extending over several rows of crops, mobile traction means connected below said canopy for tranversing it over the ground, drive means connected to said device for causing it to move over the ground, a control unit connected to said drive means for guiding the direction and s eed of movement of said device, distributing means for said treating substance connected to said device for ejecting said substance under said canopy, air propelling means on said device for generating air currents under said canopy and towards the portion of said field under said canopy for mixing and entraining said treating substance with said air for distribution and substantial confinement to the portion of said field substantially under said canopy, and an auxiliary airfoil is mounted on said device relative to said air propelling means for helping control the attitude of said device by reaction with said air currents.

26. A device as set forth in claim 25 wherein said auxiliary airfoil is adjustable for varying its lift characteristics.

Patent No. 78 DateL y 1972 Crimmins, Arthur G. et a1 Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

E01. 1, line 11, "current" should be currents line 64, "adjustably" should be adjustable Col. 4, line 50, "requirement" should be requirements line 55, "may" should be man Col. 5, line 50, after "phantom" insert outline Signed and sealed this 30th day of January 1973.

(SEAL) Attest:

EDWARD M.FLETCHER, JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents

Claims

1. A device for applying to a field mixtures of treating substances and air comprising a canopy extending over several rows of crops, mobile traction means connected below said canopy for traversing it over the ground, drive means connected to said device for causing it to move over the ground, a control unit connected to said drive means for guiding the direction and speed of movement of said device, distributing means for said treating substance connected to said device for ejecting said substance under said canopy, air propelling means on said device for generating air currents under said canopy and towards the portion of said field under said canopy for mixing and entraining said treating substance with said air for distribution and substantial confinement to the portion of said field substantially under said canopy, said mobile traction means being elongated to hold said canopy a substantial height above the ground, and said canopy and air propelling means being constructed and arranged for generating a substantial flow of air within and out of said canopy for causing a substantial force reaction by said canopy at said height on said mobile traction means whereby the footprint pressure and attitude of said canopy are responsively controlled.

16. A device as set forth in claim 15 wherein said air circulating means and said canopy means are constructed and arranged to recirculate a substantial amount of said mixtures.

24. A device for applying to a field mixtures of treating substances and air comprising a canopy extending over several rows of crops, mobile traction means connected below said canopy for traversing it over the ground, drive means connected to said device for causing it to move over the ground, a control unit connected to said drive means for guiding the direction and speed of movement of said device, distributing means for said treating substance connected to said device for ejecting said substance under said canopy, air propelling means on said device for generating air currents under said canopy and towards the portion of said field under said canopy for mixing entraining said treating substance with said air for distribution and substantial confinement to the portion of said field substantially under said canopy, and said canopy and said air propelling means are constructed and arranged for generating a negative lifting reaction on said device to help control its attitude.

25. A device for applying to a field mixtures of treating substances and air comprising a canopy extending over several rows of crops, mobile traction means connected below said canopy for tranversing it over the ground, drive means connected to said device for causing it to move over the ground, a control unit connected to said drive means for guiding the direction and speed of movement of said device, distributing means for said treating substance connected to said device for ejecting said substance under said canopy, air propelling means on said device for generating air currents under said canopy and towards the portion of said field under said canopy for mixing and entraining said treating substance with said air for distribution and substantial confinement to the portion of said field substantially under said canopy, and an auxiliary airfoil is mounted on said device relative to said air propelling means for helping control the attitude of said device by reaction with said air currents.