close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2411613

код для вставки
Nov. I26, 1946.
F. LE G. BRYANT
2,411,613 I
METER‘ING DEVICE:
Filed naa-y 25. 1942
3 Sheets-Sheet 1
Iii
27
-
,
ì
INVENTOR
BY
ATTORNEY
'
Nov. 26, 1946.
|:-l |_E G, BRYANT
2,411,613
METERING DEVICE
Filed May 25, 1942
l‘?
ú` I° '1
>
3 Sheets-Sheet 2
INVENTOR
WX‘È ¿Mx 267mb!
<7*
BY
ATTORNEYS
I
Nov. 26, 1946.
ì
METERING DEVICE
Filed May 25, 1942
www,
.ví
QNX
2,411,613
F. |_E G. BRYANT
3 Sheets-Sheet 3
¿fig
y
lNvENToR
M1122 @uw
BY
ya
fd
ATTORNEYS
Paten-ted Nov. 26,1946
_.
2,411,613
_ UNITED ,s'rArl-:s I aus Nr
>oi-'rlcls
2.411.013
Maremma nevica
Forrest Le GrandBryant, NewYork,
signor to Jemen VMachinery Company,
Bloomfield, N.
a corporation of New
. i ¿apuestan Mey z5, 1942, semi No. 444,351
d Claims. (Cl. 'I3-231)
l
This invention relates to the art of metering
' spense to the variation in the intensity of :uuml
nation so that the counting means registers the
the flow of fluids or other i-lowable material and
has for its object the provision of a simple
and accurate apparatus for measuring such ilow.
An >additional object is the -provision of an
apparatus which ofl'er very little restriction to
volume of material flowing through the tube in
a given time.
the measurement of the flow of milk or other
the flow.
Another object is the provision oi’ an appara
tus which may be easily disassembled for clean
ing.
-
’
A further object of this invention is a meter
similar liquid.
Another object of this invention is a metering
device having provision to effect compensation
. for change in the specific gravity of the liquid
Certain characteristics of the
apparatus are definitely advantageous ¿to the
measurement'of milk flow, particularly since the
l0 transmission factor of milk for the passage of
ing device of simple structure which may be
easily taken apart for cleaning and which meets
all the requirements promulgated by the boards
.of health with respect to apparatus used in the 15
_handling of food products.
I
. , One field of use for the metering device isin
light is relatively low. Therefore, for milk
metering apparatus, the photo-electric cell is
mounted in close proximity to the light-transmit
ting tube and in relatively close proximity to the
point oi’ contact of the light beam with the
light-transmitting tube. The rotating member
preferably is of spiral form mounted on bearings
with its rotational axis intersecting the light
beam axis and lying in a plane with the axis
being metered due to temperature variation in 20 of the photo-electric cell and divides the column
the liquid during the metering operation. „
of liquid into two equal parts. During that por
' A still further object of the invention is a-
metering device in which the number of rota
tions of a metering member is registered through
tion of the rotation of said member that one
edge is in the arc between the light beam axis and
the plane of its rotational axis and the photo
the intermediary of variations in light intensity 25 electric cell axis, a st_ate of low illumination
effected by rotation of the metering member.
exists in that portion of the column oi’ liquid
In a preferred embodiment ofthe invention,
which supplies light to the photo-electric cell,
liquid or other material to be metered is passed
through a light-transmitting tube wherein it
while a high state oi’ illumination exists in the
remainder.of the liquid column. After the edge
causes a movably mounted member to rotate at 30 of the rotating member has left the end of said
a speed proportional to the rate of flow. The
arc. a state of high illumination exists in that
rotational member is arranged to be interceptive
of a light beam and causes the beam to be inter
portion 'of the column oi’ liquid which supplies
light to the photo-electric cell'until the remain
rupted in such a manner as to cause a state of
ing edge of said member passes across the light
high illumination in one part of the liquid and 35 beam axis. This, of course, occurs twice for
a relatively low state o_f illumination in another
each revolution of the member. With this ar
part of the liquid or an almost complete inter
rangement, advantage is taken of the light which
ruption of the beam or a reflection or refraction
is reflected from the solids and/or fat in the
. thereof. The rotation of the member causes a
milk and each time such light is reflected from
succession of periods when a relatively high or 40 the milk, the photo-electric cell is placed in a
relatively low state of illumination exists or a
state of relatively high conductivity for the pur
succession of interruptions or reflections or re
fractions of the light beam.
The interrupted
beams of light or the succession of high illumina
tions, reflections or refractions are supplied to
a photo-electric cell, thereby causing such cell
to becomecapable of conducting current pro
~ portional to or approximately proportional to
pose of actuating the indicating or counting
means. In the case of relatively transparent
liquid such, for example, as beer, a beam of light
may be directed straight or nearly straight
through the liquid, in which case, the photo
electric cell would be mounted on one side of the
light-transmitting tube and the light beam would
the state of illumination. Thus, the number of
enter the light-transmitting tube at a point less
rotations of the member is impressed on the 50 adjacent to the photo-electric cell and possibly.
photo-electric cell as periods of increased con
directly opposite to said cell.
ductivity of such cell, and usually there are two
In practice, it has been found that the most
periods for each complete revolution of the
effective light rays for use with milk are the
member. Electrically actuated counting means
infra-red rays. For this reason, a high wattage
are controlled by the photo-electric cell in re
tungsten filament lamp preferably is used as the
2,411,613
3
light source and is operated on a fraction of its
rated voltage. Such a lamp supplies an abund
ance of the infra-red rays and the use of the
low voltage greatly increases its life. Also, a
filter may be used to ñlter out approximately
all light rays except the infra-red. The opera
tion of the device is approximately as positive
using only the infra-red rays from the light
source as when using the total light.
This has ,
advantage in the case of voltage drop since the 10
member I6’. Each spider I9 snugly fits the tu
bular portion in which it is arranged and is re
movable therefrom ,while the bottom spider rests
upon an annular flange 20 provided in the tubular
portion |2, the ñange serving to locate the mem
ber I6' in proper relation to the windows |3a and
|3b of tube I3’.
Passage of a stream of liquid
or a stream of small solids through the tube I3'
effects rotation of the member I6’.
The bracket I0 is provided with >a platform
on which is supported a light source 22’ in com
decrease in total light would be approximately
bination with a condenser lens 23’ for directing
inversely proportional to the third power of the
a beam of light to the window I3a of the tube I3’.
`drop in voltage where the decrease in infra-red
Also, the table 2| supports a photo-electric cell
radiation would be inversely proportional to ap
proximately one-half one power of the drop in 15 24' so arranged as to have its cathode facing the
window |3b of the tube I3". A toothed disk I|0,
voltage.
rotated by a motor III, is arranged to modulate
It has been found when measuring milk with
the light beam to audio frequency range of about
the measuring device of this invention, that un
'100 c'ycles per second. Electrical renergy for the
der certain conditions, an extreme variation oc
curs in the light transmission factor of the milk 20 light source 22' and the motor ||| is supplied
from a power circuit L through conductors ||2.
due to varying percentage in its butter fat con
Preferably,
a casing (not shown) is provided for
tent. In the case of milk pumped from a large
enclosing the light source 22’ and photo-electric
tank in which stratification of the cream has
cell 24’ to exclude extraneous light from the
taken place, the milk from the lower part of the
tank and passing through the device ñrst may 25 photo-electric cell and make it responsive only
to light from the source 22’.
contain 1 or 2% butter fat and have a relatively
A transformer has its primary ||3a bridged
high light-transmission factor, whereas milk that
across the power line' L and is provided withwas originally in the top part of the tank and
several secondaries ||3b, ||3c, ||3d, ||3e, respec
which passes through the measuring device later
may have a butter fat content as high as 10% 30 tively. A conventional full wave rectifier ||4
has its two anodes ‘I Ill connected to opposite ter
and consequently a much lower light-transmis
minals of the secondary I|3c, the midpoint of
sion factor. It is therefore necessary to provide
which is grounded at IIB and has its cathode ||1
means for highly amplifying the signals from the
bridged across the secondary ||3d. The cathode
photo-electric cell in the case of high butter fat
|I1 is connected through an inductance ||8 to
content and relatively low light transmission fac-I
one terminal of a potential divider IIB from vari
tor and, to'provide that the amplification will be
ous points of which lead conductors |20, |2I, |22,
automatically reduced in the case of low butter
fat content and relatively high light-transmis
sion factor.
_
|23, |24, |25, with the last ñve leading through
inductances |2I’, |22', |23', |24', |25', and con
>
Preferably, the counter is calibrated to register 40 ductor |26.
A second full wave rectifier |21 has its two an
the amount ofl liquid metered in weight units
odes |23 connected to opposite ends of the sec
rather than in volume units and, therefore, varia
ondary ||3b and has its cathode |29 grounded
tion in the speciilc gravity of the liquid being
at>
|30. The center point of the secondary ||3b
pumped must be taken into consideration. For - is connected
by conductor |3| to ground through
this reason, means are provided connected in
such a manner that electrical adjustment may be
made either automatically or manually so that
the count registered on the counter may bear
any desired relation to the number of revolutions
of the rotatable member.
Other objects, novel features and advantages
of this invention will become apparent from the
a relay coil |32 and resistance |33 and a grounded
condenser |3|a is connected to the conductor |3|
ahead of the relay coil |32. The nxed'contact
|34 of the relay is connected by conductor |35 to
one side of the power line L_and the movable con
following specification and accompanying draw
ings, wherein:
'
Fig. 1 illustrates partly in section and partly
in elevation the mechanical portion of an appa
ratus embodying the invention;
Fig. 2 is a plan view of Fig. 1;
tact |36 of the relay is connected through con
ductor |31 to one terminal of a transformer pri
mary |38a, the other terminal of which is con
nected through conductor |39 to the remaining
side ’of the power line L.
'
The conductor |24 leads to the anode of the
photo-electric cell 24’ while the conductor |23
leads through the cathode heater of the rectifier
|21 and resistances |40 and |40' to the cathode
Figs. 3 and ‘i together are a wiring diagram of
00 of the photo-,electric cell 24'. A grounded con
the electrical portion, and
'
denser |24a is connected to the conductor |24 and
Fig. 5 is a further modification.- Y
a grounded condenser |26a is connected between
In the embodiment disclosed in Figs. 1 to 4, a
the resistances |40 and |402
y
metal bracket I0 is provided with two spaced
A
pentode
voltage
amplifier
electron
discharge
alined tubular portions || and I2 which are pro
device
|4|
is
connected
to
photo-electric
cell cir
86
vided with exterior threads. A glass tubev |3'
cuit as an impedance transformer.- The cathode
coated with opaque material is'interposed be
of the photo-electric cel1 24’ is connected through
tween the adjacent ends of the tubular portions
conductors |23 and |26’ to the control electrode
|| and I2 and is held in placeby nuts |4 with
of |4| while the anode of |4| is connected to the
suitable packing I5 provided to form fluid-tight
joints. The tube I3' is equipped with windows 70 conductor |24. The suppressor electrode and
|3a and |3b and within said tube is provided a
member I6' consisting of a spirally twisted metal
ribbon provided at its opposite ends with axial
studs I'I. The axial studs I1 cooperate with pins
I8 carried by spiders I9 to rotatably support the „ 75
cathode of |4| are connected together and are
grounded through the resistance |4|' and the
screenL electrode of |4| is connected to the con
ductor |25 to which is connected a grounded con
denser I25a.
9,411,111.11
5
The cathode and‘suppressor electrode> of |4|
are connected through a condenser -|42 to the
control electrode of a pentode voltage amplifier
electron discharge device |48. The` anode of |48
is connected to the conductor |28 to which is con
nected a grounded condenser |28a, through in
ductance |44, across which is bridged a condenser
|45 to form a tuned circuit. The suppressor elec
trode and the cathode of |48 are connected
through resistance |48 to ground. The screen
electrode of |48 is connected to conductor |28 to
which is connected a’grounded condenser |28a.
'I'he heaters for |4| and |48 are supplied with
energizing current through thel conductor |28
and branch conductor |28a.
«
'
’I'he anode- of |48 is connected through a con
denser |41 to the control electrode of a beam
power amplifier electron discharge device |48 and
Preferably, the blades |88a and |84a are inter
connected for simultaneous movement so that
the blade |88a closes the circuit between con
ductors |88 and |88b only when the blade |8411
engages the contact connected to the coil |85.
The ilrst 36 contacts of the bank |88 are divid
ed into 8 groups of four contacts each and the
alternate groups are connected to conductors |15
-and |18 in such manner that one set oi' groups
contains 20 contacts while the other set contains
16 contacts and the 1li-contact set is connected to
the 14 remaining contacts. Thus, the wiper |88
in each half revolution makes nine changes in
contact between the two sets of contacts. The
contacts oi' the bank |81 are all open except the
40t.h,‘4 1st and 42nd contactsl which are grounded
at 8 .
A secondary rotary switch has an operating coil ,
|85, one end of which is grounded at |88. This
so switch has a single bank of contacts |81 >and a
wiper |88 which is grounded at | 88. The first 12
grounded condenser |2|a, through transformer
contacts
|81 are alternately connected to a first
primary |58a which is bridged by the condenser .
conductor | 11 and a second conductor |18 and
|8| to form a tuned circuit. The screen electrode '
I8 to 25 are connected to the first con
of |48 is connected to the conductor |22 to which 25 >contacts
ductor
while
contacts 28 to 85 are alternately
is connected a grounded condenser | 22a.
connected to the two conductors andthe remain
The terminals of the transformer secondary
ing contacts are connected to the second con
|881) are connected to the anodes |58 of the fullv
ductor. The conductors |15 and |18 are con-y
wave rectifier |54 and the midpoint of trans
nected
respectively to conductors |11 and |18.
former secondary |58b is connected through a 30 A transformer
primary 28811 is bridged across
condenser |55 and resistance |58 to the cathode
the transformer -primary |88a by conductors 28|
|51 of |54. A pair of resistances |58 and |58 are
and 282. The transformer secondary 28812 has its
bridged across the condenser |85, the positive
terminals
connected to the anodes of ygas-filled
terminal of which is grounded at |88. A con
tetrodes 288 and 284, the suppressor electrodes and
-ductor |8| leads from the connection between re 35 cathodes of which are grounded at 285 and 288
v sistances |58 and |58 through a resistance |82 to
respectively. The control electrodes of tetrodes
the control electrode of |48.
,
`
288 and 284 are connected through the resistances
'I'he negative terminal oi' condenser |55 is con
281 and 288 and conductor .288 to the rotary
nected through conductor | 88 and equal resist
switch wiper |88 and are connected through re-` _
. ances |84 and |85 respectively to the control elec 40 sistance 2 | 8 to conductor |8817.
trodes of gas-filled tetrodes | 88 and |81, the cath
A second transformer primary 2||a isv
odes and shield electrodes of which are grounded
bridged across the transformer primary | 88a by
respectively at |88 and | 88. One terminal of the
conductors 28| and 282. The opposite terminals
‘ transformer secondary |58b is connected through
oi’ the transformer secondary 2||b are connected
the conductor |18 and condensers |1| and |12 re 45 lto the anodes of gas-ñlled tetrodes 2|2 and 2| 8
spectively to the control electrodes of the tetrodes
respectively, the suppressor grids and cathodes
|88 and |81. The anodes of |88 and |81 are con
of which are grounded respectively at 2|4 and
nected through resistances | 18 and |14 to oppo
2|8. The control electrodes’of 2|2 and 2|8 are
site terminals of the transformer secondary |8811.
said control electrode is connected to ground
through a resistance |48. The anode of '|48 is
connected to conductor |2| to which is connected
connected respectively through resistances 2|8
'I'he heaters for the cathodes of |54, |88 and |81- 50 and 2|1 to the rotary switch wiper |88 and
are furnished with current from the transformer
through resistance 2|8 to conductor |88b. The
secondary | |8e by conductors |18 and |88.
midpoint of transformer secondary 2| |b_ is con
A conductor |88 leads from the connection be
nected through resistance 2 | 8 to the second switch
tween the coil |82 and the resistance |88 to the
actuating coil |85. The ñlaments of 288, 284, 2| 2
blade | 88a of a single blade single-throw switch,
and 2|8 are ysupplied with current from trans
the contact of which is connected to conductor
former secondary ||8e through conductors |18
|88b. The center point of the transformer sec
and |88.
ondary |88b (the midpoint oi' the transformer
The midpoint oftransformer secondary 288b is
- secondary |8811) is grounded at |88c through a
connected through conductor 228 and resistance
resistance |88d and a switch |88e and also is ccn 60 22| to the blade of a single blade double-throw
nected through conductor |84 to the blade | 84a
switch 222 having two contacts 228 and 224'. A
of a single blade two-throw switch having twol
conductor 228 leads from the contact 224 to one
contacts, one of which is connected to the con
terminal of the actuating coil 228 of a magnetic
ductor |88b and the other of which is connected
counter and the remaining terminal of said coil
to one terminal of the operating coil |85 of a 65 is grounded. The contact 228 is connected
lio-point rotary switch having two banks of con
through conductor 221 to the wiper 2280i a ro
tacts |88 and |81 and wipers |88 and |88 respec
tary switch having two banks oi' contacts 228 and
tively i'or said banks, the remaining terminal of
288. The wiper 228 is advanced by a stepping
the coil |85 being connected to ground through
coil (not shown) but similar to the stepping coils
the resistance |88. The resistance |88 is bridged 70 |85 and |85 for the wipers |88 and |88 of the two
by a condenser |8| and a circuit including a sta
tionary contact |82 and a movable contact | 88,
the former of which normally engages the latter
but is caused to move out of engagement there
with upon flow of current through the coil |85. 75
previously described rotary switches. The wiper
228 is of such construction that one arm engages
only the contacts of the bank 228 and the other
arm engages only the contacts of the bank 288.
and is advanced one step for each impulse flowing
9,411,613
through the conductor 220 in the usual manner for
switches 'pf this type. The contacts of the two
banks 223 and 230 are progressively connected to
contacts supported by a panel 23| of insulating
material, al1 of which panel contacts except four
are in turn connected to a bus bar 232 having one
end connected through the conductor 233 to one
tor |I|,» and light source 22' from the other` parts
of the mechanism. Also, it eliminates possible in
stability in electron discharge device |43 which
might develop if the high resistance |40' were
connected directly into the grid circuit of |43.
The voltage across resistance |4|' is impressed
through the conductor |42a on the control grid of
|43 and a constant positive potential is impressed
terminal of the actuating coil 228 of the counter
on the screen electrode of |43 through the con
228'. (Inorder to avoid a confusing multiplicity
of lines. only four switch contacts are shown as 10 ductor |23. The cathode and suppressor electrode
of |43 are connected to ground through resist
ance -|48 to provide self-bias for the control elec
trode. Anode voltage is supplied through con
ductor |20 and the inductance |44.
The output voltage of |43 is fed through con
are connected to contacts 234 and a wiper 235 is 15
denser |41 to the control> electrode of |48. A
provided to engage the contacts 234 successively
constant potential ig provided on the screen elec
so as to be in engagement with one to four of said
trode of |48 through conductor |22 and the cath
contacts, depending upon the position of the wiper.
ode of |43 is connected to ground through the
A conductor 235 leads from the wiper 235 to the
conductor 233. The wiper 235 is actuated by a 20 resi-stance |48a to provide self-bias for the con
trol grid of |43. Plate voltage is supplied to |43
thermostat 231 having its bulb 233 arranged in the
through conductor |2| and the tuned transformer
liquid stream. By propel` manipulation of the
primary I50a.
switch 222, the midpoint of the transformer sec
The output of the amplifier is rectified by the
ondary 200|) can be connected to the operating
coil 226 either through merely the resistance 22| 25 rectifier |54 and is impressed upon condenser |55
through the resistance |58 to charge the con~
or through the resistance 22|, rotary' switch and
connected to panel contacts, but it is to be under
stood that all of the switch contacts are connected
to panel contacts.) The four panel contacts above
mentioned as not being connected to the bus bar
panel contacts.
denser. The resistances |58 and |59 are of such
to maximum and minimum illumination once for
of an automatic volume control circuit to com
value as to give the condenser resistance net
In the operation of the device, the light trans
work a time constant considerably lower than the
mitted through the tube I3' to the photo-electric
cell 24' is dependent upon the position of the 30 slowest rotation of the member I8'. By the con
ductor ISI there .is provided a control bias to
rotor IB' which is rotated by dow of liquid through
regulate the gain of the amplifier in the manner
the tube I3'. The photo-electric cell is subjected
pensate for fluctuation in the light-transmission
each half revolution of the rotor I8'. The current
flowing from the anode to the cathode of photo 35 factor of the liquid being metered. The poten
tial on the control grids of |88 and |81 is supplied
electric cell 24' fiuctuates as the illumination
respectively from successive half-waves of the
changes. The output of the photo-electric cell
alternating current by resistances I 84 and |85
has an alternating current component of the Asame
from condenser |55 and through condensers |1|
frequency as the light interruption produced by
and |12 from transformer secondary |5017. The
the wheel I I0.
`The rectiñer |21 supplies a negative potential to . ‘ potential from condenser |55 is a negative po
tential which is self-regulating in magnitude to
the conductor |83 and energizes the coil |32 to
compensate for the varying strength of the signal
move the contact |36 into engagement with the
from -the transformer secondary |5017. Thus, as
contact |34 after the filament of rectifier tube I |4
and the cathode of |21 have successively been 4; the fluctuating light flux that falls on the en
trance window of |3' is modulated by the mem'
heated to emitting temperature.
Positive potential is supplied to the anode of
ber I6', the tetrodes |88 and |81 become alter
nately conducting and non-conducting as the
the photo-electric cell 24' through conductor |24
alternating current potential from the trans
while the cathode of 24’ is connected through con
ductor |26 and resistances |40' and |40 to the least
former secondary |5011 becomes greater or less
positive terminal of the voltage divider I I3. Con»
than average potential on condenser |55.
stant positive potential is impressed on the anode
With the blade |33a in circuit-open position
of I4| through conductor |24 and on the screen
and the blade |34a in position to close-circuit the
electrode of I4| through conductor |25. A posiconductors |84 and |8317 and the switch |33e
tive bias is supplied to the control electrode of |4| 5." closed, the midpoint potential of the transformer
'through the conductor |28' by the resistances
secondary |33b is impressed on the control elec
trodes of the tetrodes 203 and 204.` This poten
|40' and |40.
'I_jhe alternating current component oi' the pho
tial fiuctuates between two values, one of which
to-electric cell current iiows through a circuit
is more positive than the other, thereby render
consisting of grounded condenser |24a, conductor 80 ing the tetrodes 203 and 204 alternately conclue->
|24, photo-electric cell 24', conductor |26, re-tive and non-conductive. Upon the tetrodes 203
sistance |40' and grounded condenser I25a. Thus,
and 204 becoming conductive, current flows
there is across resistance I 40' a potential that has
through the transformer secondary 20012 to pro
an alternating current component of a frequency
vide impulses for actuating the counter, such
controlled by the toothed disk | I0 and modulated
impulses being in one to one ratio with the half
by the member I8'. This alternating current po
revolutions
of the rotor I8’.
tential is amplified by the three-stage amplifier
The
rotary
switches in combination with the
consisting of the electron discharge Vdevices I4|,
tetrodes 2|2 and 2I3 provide means for securing
|43 and |48. The alternating current component
of the voltage across the resistance |40' appears 70 an adjustable ratio between the number of half
revolutions of the member I5’ and the number
across resistance I4 I ' which is only a small irac
of counter-actuating impulses. Such means is
tion (l/iooo) of resistance |40' thereby making it
rendered operative by opening the switch |33e
possible for the conductor |42a to be considerably
and by moving the blade |3311 into circuit-closing
l lengthened to permit separation of the ampliiler
|4l, tube I3', photo-electric cell 24', lens 23', mo»> 76 position, thereby simultaneously moving the blade
2,411,818
|84a into position to close the circuit from |84
to |88.
g
»
10
When the metering device above described is
utilized to measure cream, the percentage of but-ter i'at in the cream can be determined by the
Power from transformer secondary |881» con
trolled by the tetrodes |88 and |81 is fed
through the conductor |84 to the operating coil
|88 oi' the two-bank rotary switch and the wipers
magnitude of the photo-electric cell output
through the medium of known equipment not
here shown. With this arrangement, the inten
sity of the light supplied to the photo-electric
|88 and |88 are advanced one step for each cur
rent impulse in the- well-known manner. In
order to provide an adjustable ratio between the
‘ cell is varied in timed relation to the rotational
speed of the member. I8' and the ysame circuit
revolutions of the member I8' and the number 10 arrangements can be used to actuate the count
shown on the counter, the connections shown on
the drawings are provided. The wiper |88 canground either conductor |11 or |18 and contacts
ing means as above described. If desired, a syn
chronous motor may be -used as the counter
actuating means.
In the embodiment of Fig. 5, the tube 24' and
|88 connected thereto as the wiper moves over
successive contacts |81 while the wiper |88 can 15 the amplifying system consisting of the electron
connect either conductor to the control electrodes
discharge devices |4|, |43 and |48 are replaced
of gas-filled tetrodes 208 and'284. Thus, if wipers
by a multiplier phototube 248 having a light
|88 and |88 are both connected to the same
responsive element, such last-named tube being ~
group oi' contacts |88, then the tetrodes 208 and
a commercial product put out by Radio Corpora
284 will conduct respectively forvsuccessive half 20 tion of America. Light from the tube i3’ is di
waves of the alternating current. If, however,
rected to the photo-cathode 24| which is con
the wipers |88 and |88 are not connected to the
nected to one terminal of a transformer second
same group of contacts |88, negative potential
ary 242b and the anode 243 is connected to the
from |83 to the' control electrodes will cause the
remaining terminal of 24212 through the tuned
tetrodes 208 and 284 to become non-conductive 25 circuit consisting of> |58a and |5l. Power is sup
respectively i'or successive half-waves of the al
plied to 24| through the transformer primary
ternating current. Thus, if either wiper |88 or
242a and the dynodes of the tube 248 are connect
|88 moves from connection with one group of
ed to intermediate points of 242b. The output of
contacts |88 to connection with the other group
24| corresponds to the output of |48 in Figs. 6
of contacts and then back to connection with the 30 and '7.
‘
.
first group, it will cause the addition of one digit
on the counter 228. ’I'he wiper |88 by engage
ment with the grounded contacts |81 causes en
Furthermore, it is to be understood that-vari
ous modifications may be made in the above
described device without in any way departing
ergizing current to ilow through the coil |88
from the spirit ofthe invention as defined in the
thereby moving wiper |88 ahead one contact on 35 appended claims.
bank |81 through operation of the tetrodes 2|2
This application is a continuation-in-part of
and 2 i8 for every ñfty contacts which switch |85
applicant’s- .co-pending application, Ser. No.
makes. The connections of the contacts as shown y
' in Fig. 4 provide a ratio between each half revo
363,238, illed October 29, 1940,l Metering devices.
I claim:
'
lution of the member |6' and the actuating im 40
v1. In combination, a conduit, means controlled
pui-ses of the counter so that the counter will be
by ilow of material through said conduit for pro
advanced corresponding to the half turns of the
ducing electrical impulses, a step by step switch
member I8’ if the coil 228 is connected directly.
having a plurality of contacts and a movable
to the resistance 22|.
wiper, means for imposing said electrical impulses
In the event that the metering device is being 45 on
said wiper, counting means actuatable by elec
used for liquid such as milk or cream, the density
trical impulses, means electrically _connecting
of which remains substantially constant over a
certain switch contacts to said counting means,
wide range of temperatures, the blade of the
and
means responsiveto the temperature of the
switch 222 is engaged withithe contact 224 so that
material
in the conduit for selectively connect
impulses from the transformer secondary 28817 60
ing the remaining switch contacts tosaid count
are supplied directly to the coil 228 of the counter.
ing means.
However, in the event that the liquid being me
tered is gasoline or the like in which a change
of density results from a slight change in tem
perature, the blade oi’ the switch 2221s engaged
with the contact 223 so that the impulses from
the transformer secondary 20Gb are supplied to
the wiper 228 of the rotary switch and to its
stepping mechanism. The number of impulses
transmitted to the counter depend upon the posi
tion of the wiper 235 which in turn depends upon
the temperature of the liquid being metered.
With the liquid at one temperature, the wiper
285 engages all the auxiliary contacts 234 so that
all the impulses from the transformer secondary
228D are supplied from the switch contacts, panel
contacts and auxiliary contacts to the coil 228.
However, with the liquid at a higher temperature
with a resulting .decrease in the density of the
2. In combination, a photo-electric cell, means
to_ illuminate said photo-electric cell at prede
termined frequency,'means to vary the intensity
of illumination of said photo-electric cell inde
pendently of the frequency of illumination to
-cause said photo-‘electric ce11 to produce an out
put voltage'having an alternating current com- '
ponent, an amplifier, means for impressing the
60 alternating current output voltage of the photo
electric cell upon the input of said ampliñer, a
rectifier, means for impressing the output voltage
of said amplifler'on the input of said rectifier, a
tetrode, means for impressing direct current
voltage from the output of said rectifier on the
input of said tetrode to bias negatively the tetrode
„control electrode, means for impressing alternat
ing current output potential from said amplifier
liquid, the thermostat 231 is operated to disen 70 on the input of said tetrode periodically to re- vduce the negative bias of the tetrode control elec
gage the wiper 235 from one or more of the auxtrode, an electron discharge relay, and means for
illary contacts, thereby correspondingly reducingimpressing the output of said tetrode on the in
the number of `impulses which are- transmitted
put of said relay to control the latter.
i
giz'càm the transformer secondary 2201) to the coil
3. In combination, a photo-electric cell, means
75 to illuminate said photo-electric cell» at prede
2,411,618
11
termined rrequency,means to vary the intensity
of- illumination of said photo-electric cell inde
pendently of the frequencybf'illumination to
cause said photo-electric cell to produce an out
put voltage having an alternating current com
ponent, an amplifier, means for impressing the
12
,
alternating current output voltage of the phölto
electric cell upon the input of said amplifier, a
rectifier, means for impressing the output voltage
of said amplifier on the input of said rectifier, a '
tetrode, means for impressing direct current
voltage from the output oi said rectifier on the
input of said tetrode to bias negatively the
alternating current output voltage of the photo
tetrode
control electrode, means for impressing
electric cell upon the input of said amplifier, a
alternating current output potential from said
rectifier, means for impressing the output volt
amplifier on the input of said tetrode periodically
age of said amplifier on the input of said recti l0 to reduce the negative bias of the tetrode control
fier, a tetrode, means for _impressing direct cur
electrode, a first step by step switch having a
rent voltage from the output of said rectifier on _
first and a second set of contacts and a movable
the input of said tetrode to bias negatively the
wiper for each set. actuating means for said
tetrode control electrode, means for impressing
wipers controlled by the output of said tetrode,
alternating current output potential from said
amplifier on the input of said tetrode periodically
to reduce the negative bias of the tetrode con- .
a-first and a second conductor connected alter
nately to successive contacts of said first group.
means grounding a contact of said second set, a
trol electrode, a step by step switch, operating
second step by step switch having a plurality
means therefor controlled by the output of said
of contacts and a movable wiper, actuating means
tetrode, two conductors connected’to the con 20 for said second switch wiper operable upon en
tacts of said switch dividing said contacts into
gagement >of the second wiper of the first switch
alternate groups, an electron discharge relay
with
the grounded contact of said second set of
having a control electrode connected to the wiper
the first switch contacts, means connecting said
of said switch, means for intermittently ground
and second conductors with selected con
ing said switch contacts, and means normally 25 iirst
tacts
of said second switch, a second tetrode
applying negative potential to said control elec
having its control. electrode connected to the
trode.
second wiper of--the first switch and its output
4. In combination, a- photo-electric cell, means
circuit connected tothe operating means for the
to illuminate said photo-electric cell at predeter
mined frequency, means to vary the intensity of 30 second switch, an electron discharge relay, means
electrically connecting the first wiper of the first
switch to the control electrode of said relay. and
means- for impressing negative potential on the
control electrode of said relay.
voltage having an alternating current com
6. In combination, a photo-electric cell, means
ponent, an amplifier, means for impressing the 35
to illuminate said photo-electric cell at predeter
alternating current ouput voltage of the photo
mined frequency, means to vary the intensity of
electric cell upon the input of said amplifier, a
illumination of said photo-electric cell independ
' rectiiier', means for impressing the output voltage
ently of the frequency of illumination to cause
of said amplifier on the input‘of said rectifier, a
photo-electric cell to produce an output
tetrode, means for impressing- direct current 40~ said
voltage having an alternating current component,
illumination of said photo-electric cell independ
ently of the frequency of illumination to cause
said photo-electric cell to produce an output
voltage from the output of said rectifier on the
input of said tetrode to bias negatively the
tetrode control electrode, means for impressing
alternating current output _potential from said
an amplifier, means for impressing the alter
nating current output voltage of the photo-elec
tric cell upon the input of said amplifier, a
amplifier on the input of said tetrode periodically
to reduce the negative bias of the >tetrode con
trol electrode. a step by step switch having a
plurality of contacts and a movable wiper. op
erating means for ~said wiper controlled by the
rectifier, means for impressing the output voltage
output of said tetrode, a ñrst and a second con
ductor connected alternately to groups of suc
ing current output potential from said amplifier
on the «äinput of said tetrode periodically to reduce
the negative bias of the tetrode control electrode,
cessive contacts, an electron discharge relay,
means electrically connecting said wiper to the
control electrode of said relay, means for im
pressing negative potential on the control elec
trode of said relay, and means for intermittently
grounding said groups of contacts individually.
5. In combination, a photo-electric cell, means
of said amplifier on the input of said rectifier, a
tetrode, means for impressing directl current
voltage from the output of said rectifier on the
input of said tetrode to bias negatively the tetrode
control electrode, means for impressing alternat
an electron discharge relay controlled by the
output of said tetrode, a step byl step switch
having a plurality of contacts and a movable
wiper, means controlled by said relays for sup
to illuminate said photo-electric cell at predeter
plying current impulses to said wiper, a counter.
electro-magnetic actuating means therefor,
said photo-electric cell to produce an output
the remaining switch contacts to said actuating
mined frequency, means to vary the intensity of 60 means electrically connecting selected switch
contacts to said actuating means, and tempera
illumination of said photo-electric cell independ
ture-responsive means for selectively connecting
ently of the frequency of illumination to cause
voltage having an alternating current com
ponent, an amplifier. means for impressing the .65.
means.
FzORREST LE GRAND BRYANT`
i
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 164 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа