U.S. patent number 3,666,178 [Application Number 05/085,529] was granted by the patent office on 1972-05-30 for field-treating device.
This patent grant is currently assigned to All American Industries, Inc.. Invention is credited to Arthur G. Crimmins, Donald B. Doolittle.
United States Patent |
3,666,178 |
Crimmins , et al. |
May 30, 1972 |
**Please see images for:
( Certificate of Correction ) ** |
FIELD-TREATING DEVICE
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.
Inventors: |
Crimmins; Arthur G. (Woodbury,
NJ), Doolittle; Donald B. (Wilmington, DE) |
Assignee: |
All American Industries, Inc.
(Wilmington, DE)
|
Family
ID: |
22192225 |
Appl.
No.: |
05/085,529 |
Filed: |
October 30, 1970 |
Current U.S.
Class: |
239/77;
239/172 |
Current CPC
Class: |
A01M
7/005 (20130101); A01M 7/0089 (20130101); B60G
2300/083 (20130101); B60G 2204/4232 (20130101); B60G
2204/62 (20130101); B60G 2500/30 (20130101); B60G
2202/42 (20130101) |
Current International
Class: |
A01M
7/00 (20060101); A01n 017/08 () |
Field of
Search: |
;239/77,78,150,151,172 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
|
1,512,387 |
|
Feb 1968 |
|
FR |
|
1,096,027 |
|
Dec 1967 |
|
GB |
|
Primary Examiner: Wood, Jr.; M. Henson
Assistant Examiner: Grant; Edwin D.
Claims
What is claimed is:
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.
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 15 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
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.
26. A device as set forth in claim 25 wherein said auxiliary
airfoil is adjustable for varying its lift characteristics.
Description
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 effect 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 crop-treating 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 FIG. 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. 11;
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. 1-4 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 80 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,
110, 88, 95 and 102 for controlling the hydraulic motors for the
various steering and adjustment functions 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 74B. Device 10B 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 74B to help support the
weight of device 10B.
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. 1-10. 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 16 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 90
cents 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 by folding it down
from its retracted phantom position against the rear of canopy 16A
shown in FIG. 12.
Device 10B (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 10B to augment
its lift characteristics by folding flaps 76C from adjacent canopy
portions 77C 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 = .sqroot.(2S/0.002378; and Hp =
V .times. Perimeter .times. Height .times. S/550). ##SPC1##
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
15 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. 1-6, 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 efficiency 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 bi-directional,
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 effective
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 20 mph maximum 10 mph normal Coverage
Width 50' (100% effective) Payload (Liquid Pesticide) 80 gallons
Maximum Operational Height 6 feet Application Control--Linked to
drive system for direct area measurement.
* * * * *