close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2127275

код для вставки
Aug- 16, 1938-
R. J. STREIF ET A1. ‘
, 2,127,275
DUSTING APPARATUS
Filed Aug. 51, 1937
4
‘ 6/
7-,”
W
J’7
46
‘5)
l
M
/7
_____________________________________ __
/2
1'9
Ii QLZ
INVENTOR5
ROBERT J .STPEIF
MILTON 5- EOBEET?UN
THE/2 ATTORNEY
Patented Aug. 16, 1938
2,127,275
UNITED STATES
H
_
PATN'i‘ orrlcs
2.127.275
DUSTING APPARATUS
Robert J. Streif, Modesto, and Milton S. Rob
' ' ertson, Campbell, Clali?, assignors to Independ
ent Crop Dusting, 1110., San Francisco, Calif., a
corporation of California
Application August 31, 1937, Serial No. 161,778
9 Claims. ‘ (Cl. 43-147)
Our invention relates to apparatus for dusting
crops from an airplane; and the broad object
of the invention is to provide a dust disseminat
ing unit by which the dust is given the desired
5. lateral and downward flow.
Another object of our invention is to provide
adjustable meansfor changing the ?ow char
acteristics of the unit.
The invention possesses other objects and fea
10 tures of advantage, some of which, with the fore
going, will be set forth in the following descrip
tion of our invention. It is to be understood that
we do not limit ourselves to this disclosure of
species of our invention, as we may adopt vari
l_5_ ant embodiments thereof within the scope of the
claims.
Referring to the drawing:
Figure 1 is a side elevational View, partly in
section, showing the dusting apparatus embody
20 ing our invention; and
Figure 2 is a rear elevational view of the same.
In terms of broad inclusion, the dusting ap
paratus embodying our invention comprises a
tube adapted to be' mounted longitudinally of
25 an airplane, so that a stream of air may ?ow
through the tube; and means are provided for
admitting dust into the air stream. The tube is
shaped to conform with the lower half section
of a Venturi tube, thus eliminating the reduced
00 pressure area along the top of the discharge
opening, and causing all of the dust to be direct
ed laterally and downwardly. A plate is also ad
justably mounted adjacent a trailing edge of the
tube, to further control the flow of dust from the
35 tube.
In greater detail, and referring to the draw
ing, the dusting apparatus embodying our in
vention comprises a tube 2 adapted to be mount
ed longitudinally on an exterior surface of an
‘1-0 airplane, such as on the under side of the fuselage
as indicated by the dot and dash line tin Figure
1. The tube so mounted provides a channel for
a stream of air, and the dust to be distributed by
the apparatus is admitted into the air stream in
1
5 the tube through a duct 4.
Any kind of ?nely
divided material may be dusted on a crop by
means of such apparatus, and when the plane
?ies over a ?eld the discharging dust travels
down upon the crop.
50
The important thing with this type of equip
ment is to get the dust to travel out in a fan
shaped ?ow which is directed downwardly, not
upwardly. Tubes used for this purpose have been
ordinary Venturi tubes, and the trouble with
these is that the dust is directed upwardly as
well as downwardly. The upwardly dispersed
dust travels around the body of the plane and
even upwardly over the stabilizer in some cases.
In- order to avoid this, our tube has the shape
of the lower .half section only of a Venturi tube. (it
The tube is preferably of rectangular shape, and
has a ?at top wall 6; the side walls I and bottom
wall 8 being concave to conform to the lower half
section of a Venturi tube. Duct 5 opens into the
tube through the top wall 6, and is positioned so 10
that the inlet is adjacent the throat of the tube.
By this shape of tube the reduced pressure area
along the upper part of the discharge opening,
which is characteristic of the ordinary Venturi
tube, is eliminated and the dust is all directed l5
laterally and downwardly.
In order to further control the discharging
dust from the tube, we preferably provide a plate
9 hingeably connected adjacent the lower trail
ing edge of the tube on a cross rod 1 I. This ?ow 20
control plate extends outwardly as a continua
tion of the bottom wall 8, and may be adjusted
to any desired position with respect to the dis
charge opening. For purposes of this adjustment
a curved rod i2 is fastened to each end of the 25
plate, on a reinforcing bar l3, and the rods are
held by suitable clamps l4 fastened to reinforc
ing bars l6 on the side Walls of the tube. By
this arrangement the plate is held in a selected
position of adjustment; and notches i1 provided 30
in the rods and engageable by the clamps insure
that the plate is positively held.
The action of this plate is to create a reduced
pressure area behind it, thus further reducing
the pressure at the lower trailing edge of the 3.
tube. This tends to further pull the discharg
ing dust downwardly, and the extent of this
downward directing action depends upon the po
sition of the plate. Thus in the position shown
in Figure 1 the dust is directed down a certain 40
amount, and if the plate is rotated further clock
wise the dust will be pulled down a still greater
amount. As the plate is adjusted further clock
wise the pressure behind it becomes reduced to a
point Where there is a violent turbulent or bur- 45
bling action imparted to the discharging dust.
These varying degrees of reduced pressure at
the trailing edge of the tube thus permit an op
erator to adjust the apparatus to best advantage
for disseminating the dust, to compensate for 50
the different slip stream characteristics of dif
ferent planes and the varying ?ow characteris
tics of different dusts.
Furthermore, the adjustable feature of the flow
control plate allows it to be set back in line with 55
2
2,127,275
the bottom wall 8, thereby reducing the drag on
the plane when the apparatus is not in operation
and the plane is being ferried from one job to an
other. If desired, a control mechanism may be
, provided for adjusting the plate 9 by a lever
a ?at top wall, the other walls being concave, and
an inlet for admitting dust into said air flow.
4. Dusting apparatus comprising a tube through
which a stream of air may ?ow, an inlet for ad
mitting dust into said air ?ow, and a flow con
in the pilot’s compartment, so that the pilot may
change the setting of the plate at any time during
trol plate adjacent a trailing edge of said tube.
5. Dusting apparatus comprising a tube through
?ight.
which a stream of air may ?ow, an inlet for ad
mitting dust into said air flow, and a flow control
It is further understood that flow control plates
10 similar to plate 9 may also be provided along the
trailing edges of side walls 1. These side plates
would have the effect of further reducing the
pressure at the sides of the discharge opening,
thus increasing the lateral dispersement of the
15 dust.
In the dust disseminating tube of our inven
tion the forward end of the tube is preferably
plate extending outwardly from a trailing edge 10
of said tube.
-
6. Dusting apparatus comprising a tube through
which a stream of air may ?ow, an inlet for ad
mitting dust into said air flow, a flow control
plate adjustably mounted adjacent a trailing edge 15
of said tube, and means for holding the plate in
a selected position of adjustment.
?ared out to provide a scoop for receiving air.
7. Dusting apparatus comprising a tube through
For this purpose all the walls may be ?ared out.
which a stream of air may ?ow, an inlet for ad
mitting dust into said air flow, and a ?ow control 20
20 In order to keep the top of the tube ?at however,
we prefer to ?are out only the bottom and side
walls.
We claim:
1. Dusting apparatus comprising a tube through
25 which a stream of air may ?ow, said tube in sec
tion having the shape of the lower half of a
Venturi tube, and an inlet for admitting dust
into said air ?ow.
2. Dusting apparatus comprising a tube through
which a stream of air may flow, said tube having
a ?at top wall, the other walls conforming to the
lower half section of a Venturi tube, and an inlet
for admitting dust into said air flow.
3. Dusting apparatus comprising a tube through
35 which a stream of air may ?ow, said tube having
plate pivotally mounted for adjustment adjacent
a trailing edge of said tube.
8. Dusting apparatus comprising a tube through
which a stream of air may ?ow, an inlet for ad
mitting dust into said air ?ow, said tube having 25
a rectangular discharge opening, and a ?ow con
trol plate adjacent said opening.
,
I
9. Dusting apparatus comprising a tube through
which a stream of air may ?ow, said tube in sec
tion having the shape of the lower half of a 30
Venturi tube, an inlet for admitting dust into said
air ?ow, and a ?oW control plate adjacent a
trailing edge of said tube.
ROBERT J. STREIF.
MILTON S. ROBERTSON.
35
Документ
Категория
Без категории
Просмотров
0
Размер файла
257 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа