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Патент USA US2404757

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July 23, 1946..
Filedv June 6‘, 1942
5 Sheets-Sheet 1
James/7’3522/10”. \‘
Ed” d/l'" Goodyear
‘may 23, 1946» I
Filed-June e, 1942
s Sheets-Sheet 2'
j“ Fig/=0
PLUG P417?’
sLowme 54’
‘t > TEST
' :
' -. '5,
e?mesh" Starr f
July 232 1946-
Filed June 6, 1942
5 Sheets-Sheet s
July 23, 1945-
- 2,404,757
Filed June 6,/1942
5 Sheets-Sheet 4 ‘
‘34.9v 5654"
Patented July 23, 1946
’ 2,404,157
James HKStarr, La Grangé, and Edward A.
Goodnow, Glenview, Ill., assignors to Electro-
Chemical Engineering Corporation, Chicazgm.
111., a‘corporation of Delaware
Application J une 6, 1942, “Serial ‘N0. 446,144
5 Claims. (01. ‘177-311)
‘This invention relates to an instrument box
or terminal ‘box forvanelectric control circuit.
‘More speci?cally the invention relates to‘ a
-box—like unit suitable for mounting in the en
gineer’s cab of a steam locomotive and contain
ing electrical devices adapted to indicate and
movable panel adapted to be completely sepa
rated from‘the box; ‘-
A still further object of the invention lisyto
provide ‘an instrument box ‘with a ‘sub-panel
mounting for various electric control units which
areplaced-in proper circuit relation by the mere
fact ofinser'ting the panel in position in the box.
‘the locomotive boiler.
A still iurther‘object of the invention is to
The box or unit' of this invention will be here
provide an improved ‘instrument ‘box ‘for vauto
inafter speci?cally described and illustrated in 10 matic foam control ‘systems.
‘connection ‘with an automatic foam blow-01f
Still another object of the invention ‘is 'to
system‘ for a locomotive boiler, but his not lim
provide an ‘instrument box adapted “for ‘mount
ited to such preferred ‘use ‘since, ‘for example, the
ing in the‘ engineer’s cab of a steam locomotive
illustrated electrical devices invthe box can ‘be
to not only house control units ‘for an automatic
rearranged or ‘replaced to control a different
locomotive‘ boiler vblow-off system but for also
type (of- system. The invention; therefore, in
visually indicating to ‘the engineer the condition
cludes, within its ‘scope, many different forms
of the boiler water in ‘the locomotive boiler.
:of ‘units in addition to ‘the illustrated unit for
Another object of the invention is to provide
controlling many different forms of electrical
a‘ standard instrument box unit for automatic
.syste‘mstin addition‘to the illustrated system.
blow-off ‘control systems which ‘contains readily
A. feature ‘of the unit of this invention is its
shiftable conductor links or bus bars which can
compactness .and‘the arrangement of the‘parts‘
be arranged as desired to adapt the 'unit‘for use
automatically control‘ “ foam conditions within
therein for quick accessibility.
> i
with different types of systems;
.A further feature of ‘the unit is its adaptability
forv'use-with different types of systems which is
made. possibleiby rearrangement of readily shift
' will 'be apparent to those skilled in the ‘art from
the following detailed description of ‘the annexed ‘
.able ‘bus bars or conductor links mounted in the
sheets of drawings which‘, by way of preferred
Other and further- objects of the invention
example, illustrate one embodiment of the ‘in
strument box and one embodiment of a foam
control system in which the box is useful.
On the drawings:
Figure 1 is a ‘fragmentary side elevational
view, with parts ‘broken away in vertical cross
section, to illustrate underlying parts of a 110cc
motive equipped with a three-electrode foam
‘Another, feature of‘ the 'box is the readily re
movable panelatherein which carries electrical
devices adapted‘. to be placed in proper circuit
relation ‘withlother parts or devices in the box
by the mere seating of the panel in the box.‘ The
panel can be removed ‘to expose all underlying
parts for devices in the box and to give free ac
_cessitoallparts or devices mounted on the panel.
The panel, when lifted out of the box, is com
blow-off system automatically controlled from
the instrument ‘box of this ‘invention which is
‘illustrated ,in dotted lines‘ as mounted in the
Vengineer’s cab of the locomotive.
Figure @2 is a side ‘elevational View of the in
,pletelyseverecl .from all connection therewith,
since no pwiresl'needextend between. the box
‘mounted'parts and thecpanel mounted parts“
, 1 A still; furtherfeature :of the. invention is its '
strument. box.
readilyopenable "spare partscarrying cover and
the light transmitting ports in the’ cover as well
an opening of the box.
‘Figure 5 is a plan view ‘of the front face of “the
removed ‘panel.
rality of control devices in compact but acces
with the detachable panel removed from the box.
.yide‘a unit, such asaterminal box, having a‘plu
:. strument box‘w'ith the cover in open ‘position and I
_It is, then, an object of‘thisinven‘tion to pro
strumen‘tl box .With the cover ‘in "closed position.
‘Figure 14 is a front felevational view of the ‘in
the wording on .the ‘cover which .rev‘eal‘lat a
. glance the‘conditionof the ‘system without neces
t ‘Figure 3 is a, front elevational view. *of the ‘in
Afurther object :of the invention .is the pro
;vision of an instrument box for an electrical con
trol circuit which has control devices mounted
therein in'compact relationship .for ‘coopera
tion with other control devices mounted on are- ‘
Figure 6 is ‘a plan .viewof the rear face ‘of ‘the
removed panel.
Figure '7 is a side elevational view of the remov
able or detachable panel, shown in Figures ‘5 and‘6.
Figure 8 ‘is a longitudinal cross-sectional view,
, with parts in elevation, taken along ‘the line VIII——
VIII of Figure 4,
. I'll
f' f
on the locomotive for supplying the compressed
air to a pipe line 26a which, as will be hereinafter
Figure 9 is a view similar to Figure 8 but with
the panel of Figure '7 mounted in position in the
explained, furnishes the compressed air to a sole
noid operated valve which valve in turn can be
CA opened to supply the air to the pipe line 26 and
then to the blow-off valve 2|.
Figure 10 is an enlarged longitudinal cross-sec
tional view, with parts in elevation, of the sole
noid valve taken along line X—X of Figure 8.
Figure 11 isj'a ‘horizontal cross-sectional view
taken along the line'XI-XI of Figure 10.‘
Three electrodes 21',- 28, and '29; project from
the top ofthe boiler shell H‘ into-theysteam space
S. S. of. the boiler. The electrode 21 is quite short
Figure 12 is a wiring diagram of the part
?xedly mounted in the instrument box and illus-i 10 and depends into the steam space to terminate a , short distance beneath the boiler shell. The
trating said parts somewhat diagrammatically,
- electrode 28 is somewhat longer than the elec
' Figure 13 is a wiring diagram of the parts on
trode 21 and depends into the trough l9 prefer-1
‘ the detachable panel and illustrating such parts ,
ably to a level-just beneath the top of the trough.
in somewhat diagrammatic form.
As shown on the drawings:.
In Figure 1 the reference numeral l0 designates.
15 The electrode 29 is quite long and extends’ into
. the bottom portion of the trough I9.
generally a locomotive having the usual boiler
The instrument box 30 of this invention is
A'?re box
' mounted on the‘ rear wall I la of the boiler in the
_ shell I! de?ning a boiler course l2.
engineer’sv cab i5, and contains electrical control
I3 is provided in'the rear end of the boiler and
?re tubes such as M project forwardly from the 20 devices in circuit arrangement with the electrodes
21, 28, and 29 and with an electric generator, bat
?reboxnthrough the. boiler course.‘ The usual
‘engineer’s cab I5 is mounted around the rear
endjof theboilen. j
tery, or other source of electriccurrentjh If
desired a steam operated turbo‘l-generator can be
usedto supply the electricity to the circuit. Such '
@Anopening I76 is provided in the top of the
boiler shell Hjand theopening is covered with 25 a generator can be conveniently driven by steam
the, usual steam, dome l1. 1 A steam throttle pipe
The control devices in the box 3?/not only give
18, _or_-_main outlet pipe to the operating cylinders
the engineer a visual indication of foam condi
of they locomotive-extendsupwardlyat its inlet
tions in the boiler butalso automaticallyeffect
end intothe steamdome'l'l.
the opening and closing of [the blow-01f valve 2|
The locomotive boilencont'ainsboiler water B.
generated in the
‘ .
to discharge the foam out of the trough l9 when
ever it is collected therein in su?icient amounts
. to a, level L. Aste'am space S. S. is provided
above the boiler water and this steam space ex-_
tends into the dome, l'l. , Steam can thus flow
above predetermined levels.
As best shown in Figurelli, the instrument box
3i! comprises a rectangularmetal housing having
side walls 32 and
a,» top wall Ell,v a bottom wall
through the upper portion, of the boiler along the
steam space S. S. into the dome l7 and thence
into‘ the upper end of the throttlepipe l8.
Anopen topped elongated box or trough I9 is
35 and a rear wall 3t.v The metal housing,.as in,
dicated in Figures 1 and 2, is mounted‘in-upright,
position on the rear wal1 I la of the boiler and for
this purpose apertured mounting. ?anges 34' and
suspended in the upper portionof the boiler and
extends‘ forwardly from the hottest’portion of
the-g-boiler' adjacent‘the ?re box 13, under the
steamoutlet opening l6, toja point forwardly of
35' are ‘formed on, the rear end. of the box to
the steam outlet.- .The box or trough l9 has a
project above the top ‘wall 34' and below the bot
bottom, side walls and end walls which cooperate
tom wall 35 respectively.
One of the'side-walls suchasithe wall 32 has
' .to‘provide an elongated channel or non-steam
generating course in‘ the steam space of the boiler.
hinge bosses>31 and 38 projecting laterally. there?
'IZheside and endwalls project into the steam
7 “space S. S.’ but terminate in spaced'relation below '
from near the top and bottom ends thereof. The
other side wall, suchas ‘the wall 33,.carries a
the top of the boiler shell so as to place the entire
bracket 3!) ‘with laterally extending spaced aper
interior ofrtheboxi along its length in communica
tured ears 39’ receiving. therethrough a swivel’
tionwith the steam space.
pin 4t and receiving therebetweena swing bolt 4 I.
As foam or light water develops'above the level
Lil/1i theboiler, it v will be intercepted by the
.troughfandispill into the trough so as to prevent
entrainment with vthe steam entering the steam
dome. {Asa resultof this collection of foam or
' A cover 42 having a pair'of. apertured ears 43,
straddling the boss 3'5, and a sec'ond'pair of aper
turedears G4 straddling the bo'ss.33,~is hingedly
connected to the box by meansof pintles or
bolts 45 extending through the ears and bosses.
The cover, 42 is'adapted to close.the open front
of the ,box andthe hinge 'arrang'ementis such
that, when the cover is swung to vopen position,
the entire. front'of theibox .will be ‘exposed as
shown inFlgure .4: The cover has‘ a'ifurcated
‘light water in thetrough, a higher quality steam
is delivcredto the throttle pipe and foaming to a .
,leve1 su?icient to enter. the throttle pipe is‘ pre
. A The bottom‘ portion of the trough l 9 communi
cates with a drain pipe 20 discharging into an
.air pressure,‘ operated blow-off valve 2|. The
' ?ange 46 .on the free side-thereof. adapted to
receive. the swing " bolt ..4l "forjfholding__ the cover
blow-off. valve ‘is :mountedbn top of the boiler
in closed positionj‘ f
shell-‘H; and discharges through a pipe 22 into a
steamvandwater separator 23 ‘also mounted on
top.v of‘the .boiler shell in front of the engineer’s
cabfl5; ,Water freed from steam, is drained from
the separator to the road bed beneath the locomo
tive through a drain pipe 24. Steam ?ashed from
the blow-off water is discharged from ‘the sep
arator through a steam‘ outlet 25 in the top of the
The inner face of the ‘cover ‘hasr'a peripheral
groove 41 bounded by flanges which straddlethe
side and end walls of the box was to seal the
box when 'the'cover isiinclosed position.- If de
sired, a gasket. could be mounted in this groove
_-,Air under pressure is'supplied to the blow-off
.valve 24 for‘ actuating: the same through a pipe
line '26. A compressed air tank T can be mounted 75
A somewhat thickened transverse portion 4V8 is
also provided on the inner wall‘ of the cover 41
to carry brackets“ and 50 with spring arms so
'thatspare fuses Elf and spare Pbulbs§52 can be‘
carriedzin the cover; The cover thus‘ serves as
parts'carrier. ~ T
. {M
w The cover is‘ also apertured at three different
"housing ‘and loan ‘be quic'klylremoved from ‘the
locations to receive bull’s-e-yellenses 53, 54, and 155
for transmitting light from bulbs mounted in the
housing by mere ‘removalof the nuts '11".
A ground strap '12, ‘as shownin Figure ‘5-, can
be vsecured to the panel?!) to surround ‘one of the’
‘box as will be hereinafter ‘described to visually
indicate to .the engineerithe ‘foam condition in the
boileras well as the functioningof thefoam con
threaded» mem'bers'?-‘l and to receive the-nut ~11’
tightly thereagai-nst ‘for grounding »-the entire
panel to the box.
‘ J l ..
The top wall £315 of the housing has a :boss. 55
Anglestrips ‘l3 and “can be Welded or soldered
in which is secured the end ‘of a pipe or. conduit
to the :f-rontlfaoe ‘of the panel 110 to‘act as light
51 for aicable I) containing wires-27’, 28'; 29' and 10 barriers toprevent light from any of the lamps
Bi’- Ifrom the electrodes and .batterylas shown in
‘8.0, .81! and 82 from showing through any of the I
Figurel. This cable .enterst'he topwall‘34 ofithe
bull’s-eyes 53,54 and 55 not‘ associated with the
housing as best shown in Figure island the various
lamp which may at the tinreloe-‘lig-hted. ‘ a
wires‘thereof are connected as indicated to- the
As also shown in Figure 5 the ‘front or ‘outer
varioilsposts of a binding post panel. 58‘, mounted 15 iacelof the panel ‘It ‘carries a ‘fuse "bracket 15 with
in the box at ‘the upperend thereof.
spring ‘clips receiving ‘a fuse 76. The panel'lis
'A‘sibest shown in Figures'lél,‘ 8 ‘and 19, the hind
apertured .as at 1'3 and 18 to receive insulation
inlgtpost' panel'SB is carried on‘ standards-or sup
‘grommets ‘l9 permitting the passage of wires bee
ports ‘59 from the rear ‘wall ??lof the box. This
tween the front ‘and? rear face of the‘panel. ‘ The
panel 58 is made of Bakelite 1or other insulating 20 panel 'isalso apertur'ed alt $6.1M’ and >32 to receive
material and mounts eight ‘binding posts ?ll.
some of the pairs ‘of binding posts .61}, as shown
in Figure 4, are connected by means :of‘links such
therein the socket collars of lamp sockets $83; 84
and 85. .A still further ‘aperture 35 is provided
in .the panel to receive the upper end of the male
member of the plug 63.. This male plug member
as ‘61! and some-of the binding posts ?ll are ground
ed to the metal housing by means of a link such
as $2. wThese‘ linlrsibl‘ and t2 can :be ‘switched
.' can be held in the aperture 85 by means of two
Astrap 'SL'secured
through to
panel 1i}.we,
> candoe
.. _. used
around to adapt the lboxvfor‘iuse. indifferent cir
as. a-handle to assist in removing panel .16) from
cuits as will be hereinafter morenfullyzdescribed.
e'gIl'helpanel-éia also mounts the female member
of aneight-circuit plug ‘63.
theinstrument box 30;,
l _
.Asoshown in Figures ‘6 and 7, time delay :switch'
W: is mounted on the] rear .‘face of :thepaheliil
Alfluse bracket 6'4 is also .mounted‘on the panel
58 for carrying ‘a fuse 65 inithe spring arms there
together with threerelay switches v.cs‘l, ill;v and 93.
Seven binding .posts 96 are.a'lso mounted \onxt'he
A switch S1 ‘is mounted on the inner .f ace of the
panel 13 andprojectfromthe rear face thereof. ~
sidewall 33 and this side walllis iapertured to 3-5 . Links or bus barsksuch as E35~can be used to
join‘ various binding posts all for adapting the
permitthe switch handle Hpto project ‘there'
instrument box to. various circuits. , _
through for manual operation‘,- As will be here
As indicated in Figures T7 to 9, when the panel
inafter more fully explained, the switch S1 is an
H is mounted in the housing on‘ the supporting
on and o? switoh'to'throw the circuit into and‘
40 pins 61 and 68, the male member of‘ the plug ‘83
out-of operation.
L ‘
A second switch 1S2 is mounted on‘thelinner face
of the side wa'1l32 and this Wallis likewise aper
tured to receive'theret-hrough the operating han
dle H2 of the vswitch. ' This switch S2,‘ aslwill 'be
hereinafter more ‘fully explained, is a testing
switch for the long and short electrodes ‘28 and
will have the eight prongs thereof ‘fitting into the
corresponding‘receptaclessin the female meme
ber of the plug 63 carried by the ‘binding post
panel 53. Thertimedelay switch ti’! and the reg
lay switches SI will ?t into amplespace provided
in‘ the housing as shown in Figure 9 so-as?not to
interfere with the switches or binding‘post' panel
in any manner._ Likewise the binding. posts 94,
1 As best shown in Figures 8 ‘and '9,~the bottom
wall 350i the housing-has an apertured‘boss 35a 50 and the links ‘85 of the panel 10 will clear the
solenoid valve projecting into‘the housing;
‘ thereon ‘receiving a solenoid ‘valve S.‘ V. The
As shown in Figures 10 and 11 the solenoid
solenoid actuator for the ‘valve proje'cts‘through
valve S. V. includes a cylindrical casing ‘ Hill
the boss into the interior of ‘the housing while the
projects into the housing as shown in Fig
valve proper depends from the bottom of the
ures 8 and 9 and which contains a sleeve It“. A
housing and serves to control ‘the ‘?ow of com
As shown ‘in Figure 4, and as also shown in
Figures -'8 and 9, the lower corners of the housing .
solenoid operating coil 192 is disposed. in the eas
ingilull around the sleeve H3]. 1 A base I83 is pro
vided for mounting the casing and sleeve. _ This
have supporting blocks 56 formed therein and exe
tending‘ to a level beneath the openface of the
lug... A top wall member m4 covers the leasing ‘
pressed air to the blow-oft" valve 2!. i
housing. Threaded pins 51 projec't‘from the up?‘
per-ends of these supports ‘66.
' >
base=can be secured to‘the boss 35a ‘of the'hous
and is apertured‘to receive aplunger [05 with a
threaded shank H36 projecting upwardly there-_
The‘lower pair of ‘supportstti'for the panel‘ ' from. )‘A capmember I67 receives the shank. I95
58 havev threaded rods 68 projecting" therefrom
and carryinglspacer sleeves 69 therearound. The
spacer sleevest? terminateat the same level with
the ends of the supporting 'iblOCkS or bosses 66.‘
As shown in’ Figures 5, >6, ‘7 and 9,‘ a removable
panel 10 has apertures ‘H in the corners thereof
adapted to receive the threaded members v6'! and
68 respectively so that the panel will rest on the
supporting bosses 68 and the sleeves ‘69 respec
tively ‘in the housing. ‘ Nuts "H" are threaded on
these members 61" and 68.. In thismanner. the
panel ‘10 is readily“ mounted in‘posltion inlth'e
inthrea‘ded relation therewith and a locking‘ nut ’
I03 can be disposed above the cap around the
shankllll?' to lock the plungerat a ?X6d level,‘ ‘ :
The inner end'of the plunger carries a plug I69
for seating the end of a coil spring I Ill.‘ The coil
spring acts against a movable plunger H! con
trolled by excitation of the coil l02.. The lower
end of this movable plunger I'll projects into a
valve casing H2 depending from the’ ‘mounting
basel03. The casing H2 has three ports H3, H4,
and VI ‘[5. The port H3 receives the pipe line ‘26a
from the compressed air tank T.‘ The port 114
receives the pipe line 26 to the blow-‘off ‘valve 2‘l‘;
The port II 5- is a bleeder port adapted to exhaust
shown in Figure 3 and need not be operated for
compressed air from the pipe line 26.
automatic functioningof the system.
‘ provided with a second valve seat 120 having a
The wiring diagram of Figure 12 illustrates the
connections to the female plug member 63 on the
binding post panel 58 of the instrument box.‘ As
therein shown, one link 6| connects the post
wired to the positive side 3I"of the battery 3I
with the post wired to the positive side of the
generator. A second link'BI connects the post
passageway therethrough in‘ alignment with the
passageway in the port In and also communi
wired to'the groundwithithe: post wired, to the
negative side of, the battery.» Another. post,
_ Air from the pipe line 26a enters a chamber
,IIB of the casing H2. This chamber contains a
valve seat I H with a bore therethrough commu
nicating with a second chamber H8 having the
,A third chamber H9 containing the port I I5 is
cating with the chamber H8.
‘ '
marked “Gen.—,” as shown, is wired throughthe
A valve I2I is carried by the movable plunger
fuse 65 with the last mentioned post ontheneg:
,I II and is adapted to seat. on the seat III for
ativeside of the battery. All electrical energy is
closing the passageway therethrough. A second 15 supplied from the generator when the links GI
valve I22 ,is mounted in the chamber. I I9 and is
are in place. 'When the links BI are removed the
adapted to seat on ‘the seat I20 for closing the
battery is used to supply energy for the coils of
passageway of thisseat. The valve “I22 can be
relays 9|, 92 and 93 while the generator is used
.carried on a spring urged plunger I23 seated in
to supply energy for the coils of the delay‘ switch
20 90 and the solenoid valve S. V., as Well as for the
an endrcap I24 at the, bottom of the casing.
A ribbed or longitudinally grooved spacer. pin
lights 80, 8| and 02.
I25 is slidably mounted in the aligned bores or
The various wires. from the electrodes and
from the battery and ground are connected to,
the binding posts as indicated. The wires from
' passageways of the seats H1 and I20 for en
gaging the valves VIII and I22.
When the solenoid coil I02 is energized the 25 the binding posts are all combined in acable and
plunger III is drawn against the spring pressure
lead‘to the switches S1 and ‘S2. The “On” posi
i I 0'into the sleeve IOI therby unseating the valve
tion of theswitch S1 connects the binding post
I2I.‘.. This permits the spring acting on the valve
panel with the. solenoid Valve. The “Short”v
I22 to close the valve I22 so that communication
and “Long” positions of the switch S2 connect
‘will .existrbetween the pipes’ 26a. ‘and. 26 thereby 30 various circuits to effect a testing operation
permitting the flow of compressed air to the blow
oil valve and opening the/valve to discharge the
of the “Short” and “Long? electrodes aswell as
the operation of the solenoid valve.
collected light Water and foam out of the trough '
As shown in the removable panel wiring diae.
,I9. .When the coil I02 is ole-energized, the spring
gramvof Figure 13, themale member of the plug
I I0 will seat the valve I2I thereby forcing the pin 35 63 has all of‘ the prongs connected with wires
I 25 against the valve I22 to openthis latter valve.
from a cable and the various control devices re-v
The pipe line 29 will thereby‘ be in communica
ceive; corresponding.v wires from this cable.
tion withv the bleeder chamber H9 and port H5
Various bindingposts 94 are connected through
to "exhaust air from the blow-off'valve and per
the links 95 for proper circuit arrangements of
40 the illustrated three-electrode system. If] a
mit-the valve to close.
- 7'
The supply of air under pressure to open the
two'relectrode system is used, the connecting links
blow-off valve, the shutting off of this supply,
are rearranged to disengage the corresponding
and the venting of the air in the valve to the at
control devices for the eliminated electrode.
mosphere, is thus automatically accomplished by
When foam or light water spills into the trough
I79 and reaches a level sufficiently high to contact
. -' vAs shown in Figure 3, the-outer face of ‘the
the extra long electrode 29, no current flows, as
cover ‘42 can have a name plate I30 bolted there
a relay switch contained in relay 93 is open. As
on and apertured in alignment with the apertures
the foam level rises into contact‘ with the long
in the. cover to expose the various bull's eyes 50 electrode 2'8’current will "?ow through relay'92
thereinl The plate I30 preferably bears legends
to close its switch thereby causing. current to
such as “Unsafe foam” under the bull’s-eye 55;
flow through the heater coil of time-delay switch
“Blowing” above the bull’s-eye 54; “On” and
90. After a time delay, contacts of time-delay
“Oil”; opposite the switch handle Hi; “Test
switch 90 ‘will close, causing current to flow
switch”‘opposite the switch handle ‘H2; “Short” 55 through relay 93 to close two of its switches and
above the switch handle H2; and “Long” below '
open one of its switches, thereby feeding cur
the switch handle H2. The bull’s-eye 53 can have
the legend “On” directly’ thereon.
rent to, the solenoid coil for opening the valve
and to thelight for bull’s-veye 54 to indicate that
the system is discharging foam, feeding current
The switch handle H1, when moved to the"‘On"
positionplaces the system in operation. With 60
the switch handle H1 in‘ “On” position the bull's:
eye '53 will light up.
_ The “Test switch” handle H2 is fbr haidytest '
ing the circuit, to" heater coil of time-delay
switch 90, thereby causing its contacts ‘to open.
ingof the apparatus to determine whether ‘or not
‘Current will continue to ?ow through relay 93
the system is in proper working conditionhWhen
the switch handle H2 is moved to the “Short” po
sitiomboth bull’s-eyes 54 and55 shouldv light up
and the blow-off valvevshould open. Whenjthe
switch handle Hzis moved to the “Long” posi
through relay 93 and the extra long electrode to
act as a holding circuit forrelay 93,‘ and break
until therlevel ‘of: foam ‘in: trough vIii-subsides
below the end of electrode 29, thereby breaking
the holding circuit of relay 93 and permitting
relay 93 to open, thereby breaking the’ circuit
to the'solenoid .toclose thevalve and ‘opening
tion, the bull’s-eye 54, after a time delay, should 70 the circuit through the light for bull’s-eye 54; j
light up andthe blow-off ,valve should also open,
This gives the engineera quick check ‘on the op:
erationiof the system "to determine'vvhether or
not it_is_ in prop'er'working' order. H The switch
When foam rises to a level su?icient to con
' tact the short electrode 21 a third relay 9I is
energized. This relay when closed effects the
energizing of relay 93 and lighting of the light
handle"l-I2 isnormally in themiddlejpositionas 75 for bull’s-feye 55, thereby indicatingtothe engi-fi
near‘ that the foam-‘has reached an unsafe level
2'. A terminal box for an electrical ‘system
in the ‘boiler. The‘energizing' of‘ relay 93 causes
comprising a rear wall; peripheral walls extend
the closing‘ of two of its switches and the ‘open
ing around a margin of said rear wall to define
ing of one'of' its switches, thereby causing open
an ‘open front housing; an apertured“ cover for
ing ‘of the solenoid valve; lighting of light- for 5 closingthe open front‘ of said housing‘; a first
bull’s-eye 54, closing of‘ a holding circuit for
panel in said housing in spaced‘ relation to said
relay 93, and opening of the time-delay switch
rear wall‘ with one edge adjacent a peripheral
heater circuit, all as hereinbefore described;
wall; a second panel‘ removably mounted in said; ,
If bull’s-eye 55 remains-lighted for an. appre
housing with one end‘ portion overlying the'l?rst
ciable length of time, the: engineer should blow 10 panel and its other end adjacent
off, the ‘boiler through the‘ manual means usually7
peripheral wall-;'coacting devices on the‘ overly;
provided on a locomotive. When the foam level
ing portions of said panels for removably sup
subsides away from the short electrode 2'! relay
porting said second panel; supports‘ for remov
9| will be deenergized, thereby shutting off the
mounting the other portion of said second
light -to bull’s-eye 55. However, the solenoid v15 ably
panel; separable plug parts on proximate por
valve will not be closed because it will be receiv
tions of said panels adapted for disengagement
ing current through relay 93 and will remain open
upon removal of the second panel ;' and indicators
and light the bull’s-eye 54 will remain lighted
the second panel registered with the cover'
until relay 93 is de-energized by foam level sub
siding beneath long electrodes 29, thereby open 20 apertures to be visible therethrough.
ing holding circuit of relay 93.
In a three-electrode system, therefore, the
foam, light water and other impurities in the
collecting trough ?rst contact the extra long
electrode 29 and, upon rising into contact with
the long electrode 28 after a time delay, the
closing of a circuit is effected to open the blow
off valve and to light the bull’s-eye 54 thereby in
dicating that the system is blowing off. If foam
development is quite rapid and rises to a still 30
higher level so as to contact the short electrode
21, an additional circuit is energized to light up
the bull’s-eye 55 and thereby indicate to the
engineer that bad foaming conditions exist in
the boiler. If the top bull’s-eye 55 remains lit
for an appreciable time, the engineer may open
a manually controlled blow-off for effecting a
more rapid subsiding of the foaming conditions.
The top electrode, or short electrode, is useful
3. A terminal box for an electrical system com
prising a rear wall, top and bottom walls, and
side walls, said walls together de?ning an open
" front housing; an apertured cover for closing
the open front of said housing; ar?rst panel in
the upper portion of said housing in spaced rela
tion to the rear wall; electrical devices mounted
on said first panel; a second panel removahly
mounted in said housing to extend below said
?rst panel to the bottom of the housing thereby
to divide the interior of the housing into separate
front and rear sections; coacting devices on prox
imate portions of said panels for removably
mounting the upper portion of said second panel
on said ?rst panel; and supports in the lower por
tion or the housing for removably mounting the
lower portion of said second panel; separable plug
parts on confronting proximate portions of the
respective panels adapted for disengagement upon
as a safety device in the event that the long 40 removal of the second panel; indicators on the
front of said second panel registered with the
apertures in said cover; and means in the bottom
portion of the housing for receiving a device that
has separable members one of which members is
accessible for removal from the exterior of the
electrode 28 does not initiate the blow—o?‘. Once
the blow-off has been started by either or both
the short and long electrodes, the blow-off will
continue until the foamy water subsides below
the level of the extra long electrode. Upon drop- ‘in. on
ping away from the extra long electrode, the
circuits will all be broken and the blow-off valve
will close, but the level of impurities in the trough
,4. A terminal box for an electrical system com
prising a rear wall; peripheral walls extending
around the margin of said rear wall to define
clear steam channel is provided to the steam out 50 an open front housing; an apertured cover for
closing the open front of said housing; a ?rst
It will, of course, be understood that various
panel in the upper portion of said housing
details of the invention may be varied through
mounted upon supports projecting forward from
a wide range without departing from the princi
the rear wall thereof to position said first hous
will be near the bottom of the trough so that a
ples of this invention and it is, therefore, not the
purpose to limit the patent granted hereon other
wise than necessitated by the scope of the ap
pended claims.
We claim as our invention:
1. An instrument box for an automatic elec
trode-actuated foam control system which com
prises a housing, a binding post panel ?xedly
mounted in said housing, binding posts on said
panel adapted to be placed in electrical connec
tion with the electrodes of the system and with
a source of electrical current, conductor links
adapted to connect various of said binding posts
in accordance with the particular foam control
system with which the box is used, a removable
panel, electrical system controlled units mount
ed on said‘ removable panel, and shiftable con
ductor links on said removable panel for varying
the connections between the electrical control
units in accordance with the particular foam con
trol system.
ing in spaced relation thereto; electrical devices
on front'and rear faces of said ?rst panel; a
second panel removably mounted in said housing
to extend below said ?rst panel to the bottom
of said housing thereby to divide the-interior of
the housing into separated front'and rear sec- ‘
tions; the upper portion of said removable panel
mounted on supports projecting forward from
the lower portion of the ?rst panel; electrical
devices on the front and rear faces of said second
panel and extending into the respective front
and rear sections of the housing; supports for
removably mounting the lower portion of‘ said
second panel; separable plug parts on proximate
portions of the respective panels adapted to be
disengaged upon removal of said second panel;
indicators on the front of said second panel reg
istered with apertures in the cover; and means
in the bottom of said housing for receiving a
device having a separable portion that is accessi
ble for removal from the exterior of said housing.
5. A terminal box for an electrical system com
prising a plurality of walls providing an open
front housing; an apertured cover normally clos
ing the open front of the housing; separate front
‘ and‘rear panels mounted in said housing in spaced
relation to each other, one of said panels being
?xedly mounted in the upper portion of the
housing, the second panel being removably
mounted in overlying relation to the other panel
and supported at one end by said ?rst panel;
supports in an opposite portion of said housing
for mounting the adjacent end of the removable
panel; separable plug parts on proximatev PQT'
tions of thelrespective panels ‘adapted vfor dis;
engagement upon the removal of vthe second
panel; electrical devices on the removable panel
adapted for removal with said panel; and indi-'
cators on one of said panels registered with the
apertures in said cover.
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