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Патент USA US2048318

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July 21, 1936-
Filed June 12, 1934
'FigJ ‘
6 2
4% ffTORNE
Patented July 21, 1936
7 1
George W. Baughman, Edgewood, Pa.,"a‘ssignor
to The Westinghouse Air Brake Company, Wil
merding, Pa., a corporation of Pennsylvania
Application June 12, 1934,"S_erial‘No.,’l'30,229
26 Claims. (01. 303-44)
Fig. 1 is a schematic view of apparatus and.
r "Y My invention relates to ?uid pressure brakes
for vehicles, and more particularly to such, circuits comprising one preferred embodiment
equipment‘in which a selected rate of retarda-_,
tion is automatically decreased in the event of ‘
(.vslipping of the wheels upon the rails. ,
of my invention, and—.
' In the'operation of high speed trains and sim
ilar, vehicles, it is desirable to provide a brake
Figs. 2 and 3am detail views of an axle re
Referring to the drawing, a brake switch or
I is provided for closing circuits
equipment having ample braking capacity to through the contact members of a retardation
take care of the most rigid requirements that controller 2, which may be of the pendulum type,
, for actuating application and release. magnet 10
10, ,the requipmentlwill be called upon to meet.
It is well known that, for a given braking pres- , valve devices 3 and 4 for controlling, respec
sure, friction type brakes are less effective in tively, the ?ow of air under pressure from the
retarding the motion of avehicle at high speeds reservoir 5 to the brake cylinder 6, and from
than at low speeds, because the coe?icient of the brake cylinder. 6 to the atmosphere.
Switches 1, 8,9, ll, l2, I3, l4, and I5 are pro
10-, friction between the rubbing parts is lower at
”“high speeds than ‘at low speeds. In order
to ‘ vided, associated with the several axles of the
bring a vehicle to a stop quickly it has been the vehicle and ‘adapted upon movement of the ve
usual practice for an operator to apply the
hicle in either direction to close a circuit from
brakes with a high degree of braking ‘pressure a source of power through the conductor I6, the
20 at the high speeds, and, as the’ speed of the ve _, several axle responsive switches 1 to l5,’ con 20
‘hicle decreases, toVso operate the brakes as to ductorl'l, the coil l8 of the relay l9, and con
cause the braking pressure to decrease in such ductor 26 to the source of power. It is assumed
a manner that the vehicle is broughtto atstop in» Fig. 1 that the vehicle there illustrated is ‘
quickly and smoothly without dangerous shock, provided with eight axles or pairs of wheels, but
‘or skidding of the wheels. ,It has been proposed obviously any number may be provided. Upon
25,' -to
accomplish such varying of the braking pres
closure of the above traced circuit, the several
sure automatically by employing retardation contact members‘ 2|, 22, 23, and 24 of the
control aparatusfor varying ‘the braking pres-_ relay l9 are actuated to their upper or illus
sure in accordance with a preselected rate of ‘ tratedposition' for closing circuits to be later
30, .
' This apparatus may comprise an inertia respon
» sive device, such as a pendulum device that as
sumes varying positions in accordance with varia
. described.
The axle responsive switches ‘I to 15 inclusive
areresponsive to the direction of rotation ofthe
several axles of the vehicle. 'A suitable structure
tions ‘in the decelertion of the vehicle, and is ' for such switches is illustrated in Figs. 2 and 3 in
which -a shaft‘25 is provided that may be the 35
‘to control the’ degree of brake’ application.
axle connecting a pair of vehicle wheels or a
If a retardation controller is provided as above ’motor shaft driven in accordance with the axle,
35 adaptedyby means of electric circuits or otherwise
described, and ‘is so arranged that the operator
may select any one of a number of different
40. rates of retardation‘ for the vehicle, it may
“happenthat theselected rate of retardation is,
under specific conditions of operation, so great
as to cause sliding of the wheels upon the rails.
It is. an object of this invention to provide
means'for detecting when one or more pairs of
45,"wheels in a train or vehicle are sliding.
A further object of this invention is to provide
a braking system in whicha selected rate of
retardation of‘ the vehicle is reduced automati
50 cally in the event that the wheels slide.
' Further advantagesand objects of my inven
tion " will appear from the ‘following description
and upon which a metallic ring 26 of magnetiz
able material is provided. A permanent magnet
21- is pivotally mounted in the trunnions 28 and
29, ‘and is so~positioned that an air cap at its
upper‘ren’d accommodates the 'metal ring 26 .on'
the shaft 25. Contact ?ngers 3| and 32 normally‘
bias the member 21 to its mid position cor
responding to the open circuit position of the
switch. Upon rotation of the shaft 25, in the
one, or in the other direction, the ring 26 cor
respondingly rotates and creates eddy, currents
in the U-shaped magnet 21 tending to operate 50
it‘in the one, or in the other direction. Such
junction with ‘ the accompanying drawing in
movement of the magnet 21 causes the contact
?nger 3| to be operated to'engage the contact
member 33, or'the contact ?nger 32 to be oper
ated to engage the contact member 34,}thus 55
of aspeci?c embodiment thereof taken in con
' 2,048,318
completing a circuit between the conducting
members 35 and 36.
The controller I comprises movable contact
segments 31, 38 and 39 and ?xed contact mem
5 bers 4| 'to 46 inclusive. The contact members
4|, 42 and 43 are adapted to be engaged by the
contact segment 31, the contact segment 38 is
winding of the release magnet valve device 4, and
back to the source of power. The energization of
this circuit causes the release valve 16 to be actu
ated downwardly to its closed position against the
pressure of the spring 18 thus preventing escape 5
of pressure from the brake cylinder 6 to the at
adapted to engage the contact member .44, and Upon engagement of the contact members 38
the contact segment 39 isadapted to engage the and 44*,‘anotl1er circuit is completed through these
10 contact members 45 and 46.
members and through conductors H4, “5, con
The retardation controller 2 comprises a... tact 2| of the relay IS in its illustrated position, 10
pendulum 41 mounted upon a pivot 48 and car; the operating winding 85 of the relay 8|, thus
rying, at its upper end, a contactii'membén; 49-‘ energiz'ingL-the relay 8| and moving its contact
that is adapted to engage one of the application ., members 81v and 88 upwardly to their circuit clos
15 contact members 5|, 52, 53,'“54*‘or 55;“for cone‘ in'g ipositions. The contact member 81, in its
trolling the operation of the application magnet
upper or circuit, closing position, energizes the
valve device 3. A second movable'contact mem
holding coil 86 of the relay 8| which has a time
ber 56 is carried by pendulum; 4'|=?and»'is~adapted‘=‘~ delay-‘release characteristic so that the relay will
to engage one of the release contactrmemberse notimmed-iately open the circuit through its con
'20 57, 58, 59, 6|, or B2 to control the operationbfw tact members 81 and 88 upon deenergization of 20
the ,sreleasermagnet: valve device:- 4;;
the'holding'coil 86.»? The- contact member 88 pre
The : application a magnet "zvalve 8. device ::3 :come
pare'sea ‘~circuit1=fo'r~ energizing- the- winding ~ 89 of“ '
prises a casing 63 that enclosesea.valvechamber.. the relay 82~upon movement ofv the'contact‘ meme
‘64,=c0nnected by port andipipez?ito the reservoir
and contains a valve 66 that is normally biased
upwardly ;by.;a :springg?‘li to: .close ‘a ~iport 68 icon
chamber 69,--:connected<by;the port and pipe 1 |~-to\
With the controller>1| mats ?rst operative-posh 25'
tionr- the-eretardation- controller "2 » will ' efI-ect'a
nectingzrthecvalve "chamber; 64' with an. outlet ~
theibrake cylinder :6.
ber" 2 |i "of the-relay Ll 91w its'llowerposi-tion;
30o; .The release magnet-:valviex-déviceA "comprises a‘
degree-10f iapplication- ofv the’ brakedependin’g"
upon ithe-'-position-'-of ‘the pendulum 41 required '
toicause separation between‘ the cooperative pairs '
of contact ‘members 49‘and 53;" and 5?iandt'59: '30
casing:,-'|2 enclosingcaniirilet chamber\;‘|3,~1that1is : Upon separation- of the 4pair' of contact members
connected .by a port“ to. avalve chamber 15 that‘ I 49Tiand %'53-' the» winding of ‘the application "mag
'contains~a-ivalve~:‘|6,uandlis.iconneoted to the at
mosphere through an exhaustiportx'l'l. The-valve
‘ gs'cfi?-isbiased upwardly toits unseated or illustramd
netivalve device 3 is deenergized,‘permitting'the ‘
valve-'to-seatandshut-“off further ?ow ‘of air ‘
from -‘-the"- reservoir 5 ‘to-‘the brake cylinder15335“v
Uponeseparat-ion of the contact members'56 and
Upon starting'theyehicle and energizing the re- i 59lltheewinding~ofhthe release magnet valve de-"
. positionabya spring ‘18. »,
lay {winding ; |8,-. the contact ‘member .22z-is actu- ' vice-4 is deenergized-‘permitting'the valve to open “
ated: upwardly; BIIdzClOSGS a signal: circuit, through
V ‘imgalamp 19, indicatingmhattherelay |9iis 'enere -
gizedhand that .all the‘wheels of athezlvehicle ore
train are rolling on-the rails. -. 'I'he:relay |9 con-~
trolsra group 'of relays 8|,=82~, 83-land184 ford-pur
poses to -_be~.later~described»: The relay-8| com-.
4515prises§an operating‘ coil 85, attime' delay holding
andiireleasewairunderpressure -from the‘ brake"
cylinder 16*to~the1—atmosphere,~ thus releasing the 40'»
Ifi-the operator *desires- a greater-degree of re
tardation~ofthe/vehicle, the controller I is moved'
to itssecond-operative position,‘ indicated'byjthe '
dotted ‘line - »‘B~' thus causing" engagementv ‘ of ‘the
coil?iil?,v and contact members ->8'|»and 88. The ~ contact <segment>31 with the ‘contact ‘member '42,
‘relay 82 comprises an operating coil-89, a time de
whichlcompletes-a?circuit through conductor I I8,’
a lay .holdingacoil 9|, and contact members 92, 93, .1 contact kmember"||l4 'iof‘the relay 84;‘conduct0r "
94-and 95. ' The-relay 83-compris'esfan'operating.I ||"9*to—the=conducting segments'52 and 5,4 of the
563%’0011 95, a time delay holding coil 91, andfcontact'i. retardationcontroller. If now the retardation
members 98 and 99.: 'l'herelayiakcomprises an controller moves :the‘ contact ‘member ‘49 "beyond
operating :coil I fit, - a time ~delay-2h0lding1coiI1.:| 02, a position whereby it will be in engagement with '
andcontactmembers I03, |||4.and.|?5. '
the'conta‘cbsegment 53; it will not interrupt the f
'Upon-Qperation of the ‘controller I Fto= it~?rstxu circuit‘through‘the-winding of ‘the application '
, r?z‘fébperative position-,- indicated by athe -' dotted :line .
magnetwalve device 3 since'this'circuit will now
“A”, the icontactrmember 4 |;- engagesrthe. contact
be comple‘tedth'rough' the " contact segment’52,
segmenting closing-aqcircuitifrom-a+source of ~ or' the'contact' segment 54.‘ 'In the second‘posi‘~ ._
power through conductor |08,-contact member 23 tion’of" the ’ controller" | ,“the ‘contact ‘segment 39
of’) the. relay. v1| 9, , conductor 1 | U'TyCOIIIB/Ct members ., engagesthecontactisegment 45,'thus completing '
760$?!’ and‘ 4|, conductor vI08 to .thecontact segment a circuit‘from'a ‘source of :powerfthrough con- 60"
. 53‘onthe retardation-controller, the movable con;
du'ctor' |‘2|“; the contact member 24"of the relay l9,‘
tact member. 49, conductorlnil, and through the conductor‘ |22,'"contact‘members39 and 45, con
winding. of the. ap'p‘alicationmagnet valve 7 device - 3 ~ ductdr I23, ‘contact member ||l5 of the relay 84;
backito" ‘the source-of power; This energization of
655%3the ‘magnet valve‘ device movesthevalve 66 ‘down
. wardly'lthus permitting the flo‘woftair under pres
and 'c'onducto? 24' to‘ the contact segments 58 ‘and
6 |'- of“ thé~retardation"controller? Should the: re
tradation cohtrollertnow move the contact‘ mem
sure item the reservoir; 5 through pipe and port. ber'58 beyond its'point‘iof engagement‘ with ‘the
65,"app1ication valve. chamber 64','port 68',’ch'am.
. ber1i_9,“port'~'and..pipe' ‘||,'to' the brake cylinder
TOQEAtIth'e ‘same. time the contact'segment 38 engages.
thevcontact?inger 44;“..clo’sing {a circuit from a
contact "segment 59; ‘it‘fwould engage the contact
segment 58',’ or the contact‘ segment 6 I‘, thus main
taining the circuit'through the winding of the re
lease 'magnetva'lve .device'4 venergized. In the
sou'rce‘of power ‘throughlconductor .| | |,' contact A se'cond'position‘of the controller | ‘it is;therefore '
members 38' "and'44," conductor f||2"“to the con- ‘ necessary for theiretarda‘tion controller‘ to' move ,
' ducting segment 59'ofthe‘retardation‘controller; 2,1" the‘co'ntactmem‘ber'49‘beyond engagementwith'f , _
V75“through"contact"-member"56, conductor? l3‘, the‘ the contact segment 52 or 54 and the contact 75“v
member 56 beyond ‘engagement with‘the contact
relay 82, thus energizing relay 82 and causing it
segment .58 or 6| on order tosrelease the brakes.
A' greater rate of retardation is. therefore pro
vided in ‘the second controller position than in the
wardly; The contact member 92 completes a
circuit through the holding coil 9| of relay 82,
?rst controller
and thecontact member 93 prepares a circuit for
~1 It the operator desires a still greaterrate of
energizingtth'e operating winding 96 of relay 83
retardation of the vehicle, the controller I is
through conductors I I1 and 133 when the con
placed in-its thirdoperative position indicated
tact member 2| of the relay I9 is again actuated
to its upper circuit closing position. The con
tact. member 94, when actuated upwardly, in
terrupts the circuit to the. conducting segments
by the letter C. -»In this position of the controller,
10 the contact segment 31 engages the contact mem-.
ber 43 and connects it through conductor I25,
contact member 94 of the relay 82, :and con;
ductor I26 to the segments 5I>and 55 of the re
tardation controller. At the same time the con
15 tact segment 39-engages the contact/member 46
connecting it through conductor I2‘I, contact
member 95 of the relay 82, and conductor I28 to
the segments. 51 and 62 on the retardation con
The contact segments 5| to 55, con
20 trolling the application magnet vvalve device '3,
are su?iciently close together so that the contact
member 49 in passing from-one segment to the
nextivvould engage the segment toward ‘whichit
is passing before separating from the segment
that it is leaving. This is true also of the move
ment of the contactmemberr56: over the release
contact segments 51, 58, 59, 6| and 62. > While
three positions only of the' controller I are shown
with the appropriate number of conducting seg
30 ments on the retardation controller 2', obviously
any‘ number of controller steps,‘ corresponding to
different rates of retardation may be employed,
with the corresponding circuits from the manual
ly operated controller to the retardation con
to move its contact members 92, 93, 94 and 95 up
‘ The width of the contact: segments‘engaged
by the contact member 49 of the retardation con
troller, and also of the segments engagedrby the
contact member 56, are such as to correspond
with the desired rates of retardation controlled
by the several steps of the retardation controller;
For example, with the three steps of retardation
provided in controller 2, the ‘width of-the con
tact segment may be so selected. as to provide for
a rate of retardation of 3, 4 and 5 miles per hour
per second, respectively.
If the operator places the controller I in its
third position, e?ecting a maximum rate of re
tardationof the vehicle, the brake will be oper
50 ated in the manner above described by circuits
extending through the ‘contact members of the
manually operated controller I and the contact
members of the retardation controller 2, unless
anduntil one pair of wheels of the vehicle re
55 ducesiits speed, as by slipping on the'vrailsi suf
?ciently so that the magnetic drag existingbe
tween the ring 26 and the U-shapedimagnet 21
‘becomes’ insuf?cient to maintain. saidsswitch
in its circuit closing position.- Upon'operation
60. of any. of the switches ‘I to. I5. to their ‘circuit
‘interrupting positions, the relay I9 becomes de
energized and the several contact members 2|,
22, 23, and 24 thereof drop to their lower posi
tions. The contact members 23 and 24 interrupt
65 the‘ circuits through the retardation controller
.to .the1 application magnet valve device and ‘re
lease magnet valve device, respectively, thus re
leasing the brakes. The contact member 22 in
terrupts the circuit through the signal lamp ‘I9
notifying the operator that the circuit .to the re
lay . I9 has been interrupted.
‘the contact‘ member 2| of the relay ‘I9 to:its
lower position completes a circuit through con
ductor I29, contact member 88 of relay 8|, con,
ductor I3I. and the operating winding 89.0f the
5| and 55 of the retardation controller for con
trolling the application magnet valve to main
tain the highest step of retardation, and the
contact member 95 interrupts the circuit to the
segments 51 and 82 on the retardation controller
which control the operation of the release mag
net valve ,for the highest rate of retardation.
The highest rate of vehicle retardation now per
mitted by the'controller 2 is that which is‘ ef
fected by engagement of the contact member
49 with the contact members 52 and 54 and en
gagement of the contact member 56 with the con
tact members 58 and 8|. A swing of the pendu
mm 41 beyond the position required to maintain
engagement between above enumerated cooper-\
ating contact members causes deenergization of
the‘ application magnet valve device 3 and of the
release magnet valve device 4, since the contact
segments 5|, 55, 51 and 62 on the retardation 00 0
controller are now dead.
» Since interruption of the circuit to the relay
I9 by operation of one of the axle driven switches
1 to I5 causes the circuit to the application mag‘
net. valve. device 3 and to the release magnet 35,
valve device 4 to be interrupted through contact
members 23 and 24, respectively, of the relay I9,
the wheels will again roll on the rails. The axle
driven switches are again closed and the coil I8
of the'relay I9 is again energized, causing the 40
relay to operate its several contact members 2|,
22, 23, and 24 to their upper positions. The
brakes are, therefore, again applied at a rate de
pending upon the operation of the retardation
controller to e?ect the next lower step of retarda
tion, the signal lamp 19 is lighted, and the op
erating winding 96 of the relay 83 is energized
from a circuit extending through the contact
member 2|, conductor II‘I, contact member 93
or relay 82, and conductor I33, causing the re 50
lay 83 to actuate its contact members 98 and 99
upwardly to their circuit closing positions. The
contact member 98 so actuated closes a circuit
through the holding coil 91 of the relay 83, and
the contact member 99 prepares a circuit for 55
energizing the operating winding IOI of the relay
84 .upon movement of the contact member 2|
to ‘its lower position.
- '1 If‘ the rate of application of the brakes is still
so great as, to cause slipping of any of the wheels
upon’the rails, the corresponding axle respon
sive switch of the switches ‘I to I5, operates to
again interrupt the circuit energizing the re.
lay I9. Upon being deenergized the relay I9 in
terrupts the circuits through the contact mem 65
bers 23 and 24 thereof, interrupting'the energiza—
tion of the magnet valve devices 3 and 4, the con
tact .member 22 again extinguishes the signal
lamp ‘I9, and the contact member 2| completes
a circuit through conductor I29, contact member 70.
9980f the vrelay 83 in its now closed position,.and
conductor, I34 to the operating winding -|0| of
relay 84 actuating its contact members‘ I03, I04
and I05 upwardly. The contact member I03
closes a circuit through the holding coil I02, and
the contact members I04 and 105 interrupt'cire
cuits ‘to 1the‘segmen'ts'52 and 54, and to the asega
nation, braking means, {a retardation controller
responsive 2'to the-rate of ‘deceleration of said ve
ment's ;58 ‘and 6.! , ‘respectively, on ‘the retardation
hicle #ior controlling the .degree 'of .;application
controller thus preventing "the iretardati'on con
troller from applying ‘the brakes 1in excess 50f
their lowest rate of brake .application.
of said {braking means, manual :means :for-select
ing a predetermined rate vofretardation -.of the ;5
Upon release of the brakes ‘resultingifr'omuop
eration 'of the relay 19', when ldeenergized, ‘the
wheels ‘.of :said vehicle at less ‘than a :predeter
vehicle, and :means responsive to ‘rotation =:of:the
minedrate '»for ‘automatically reducing the -»se
wheels again'rollaon the rails‘and the winding t8 leotedlrateiofiretardation of the vehicleea de?nite
'10 of the relay I9 is again energized ‘moving ‘the
.several contact members 2|, 22, '23, and 2411p
‘T4. In arbrake'equipmen't :for “vehicles, .-in com
wardly. The retardation controller againabe- . bination; braking means, aretardation controller
comes e?ective to regulatertheapplicationof ‘the responsive "'to the rate of deceleration of :said
brakes therrange of application being now’limited vehicle'ionrlontrolling vthe degree of application
15 to that correspondingtoengagement of "the con
"of said braking means, manualme'ans for'rselect- lo
tact members“ and‘53, and of contact members ing :a~_predetermined rate of retardation of the
'56 and 59. It‘will be:.noticed thatiuponxenergiza
vehicle, zand-means responsive to rotation of the
tion of any of .the holding coils'86, '91, -91,~‘l=02 of wheelsof thervehicleatrle'ss than a predetermined
theseveral relays 18!, 82,83 and 84, respectively, rate for1automatically-reducing they-selected rate
201 these coils remain energized until ‘:the circuit
oflreitardationxof-the vehiclealde?nite amount, 20.
' through the. contact members ~13‘8‘and‘4‘4 of ‘the
and, 'HDOH‘G; second decrease in :the rate of ro
controllerl is interrupted by‘oper-ationr-of "the
tation of \the wheels ‘of the vehicle, for :auto
matieally ‘reducing ‘the ‘selected rate of retarda
tion- of thexvehicle aiurther de?nite amount.
'5. In a>brake equipment for vehicles, 'in‘com
controller I to its brake releasing position.
Iltiwill be'inoted .that, when the vehicleicomes
251 to .rest while the’icontroller 1 ~is in abrake ‘apply
ing position, and the relay I9 is deenergized
causing the several contact members 12],, 22,23
and 24 thereof to'drop to their lower ‘positions,
the circuits through the controllersegments-L31
30 and 39 ‘are interrupted. The ‘several retardation
controller contact members '51, “52, ‘53,154,1and
‘55‘ that control the application magnet valve-de
vic'ei'are therefore made dead causing'the valve
hination, braking means, :a<retardation'controller
responsive tot-he rate‘oi ‘deceleration of said =-ve
hicie :for controlling vthe degree of "application
of ‘said ‘braking means,,:;means Eresponsive ‘to 2the
slipping of "the ‘wheels for ' automatically :e?ecting . 30
a;pr.edetermined reduction inthe rate of retarda
tionaof-zthewehicle, and signal means responsive
to-slippingyof the wheels of ‘the vehicle.
, 66 toiseat, ‘andthe retardation controller con
Inna - brake equipment for vehicles, Lin {com
"i tact members 151, ‘58,16! and 62 are also. made
dead. The winding of the .release magnet valve
device '4 is however maintained energized by the
circuit-through controller contact segment-38 and
bination, braking means, a retardation controller 3.5;
contact ?nger -M,‘conductor :I I2, contact meme
hicle, :means Iresponsive . to the slipping of the
andz'conductor ".I'l‘3, the pendulum.“ assuming
wheels 7 :for automatically veffecting ‘ a ‘predator
a ‘Vertical position as . soon .as the vehicle {-‘stops.
minedireduction-inithe rate :of retardation of the
The valves {66 and 16 are, accordingly, held in
vehicle'and signal means rresponsive "to a pre
determined \ decrease in the :rate .of {rotation :of
vWhile 'I have illustrated and described-one
preferred embodiment of my invention it
apparent that many modi?cations .thereofywith
in‘zthe spirit of my invention, willoccur to those
skilledsin .the art, and:I do not wish‘ to bealimited
otherwise than by the scope of ‘the appende
‘Having inow described my invention, what I
claim'as new and .‘desire to'secure' by Letters‘Pat
the "wheels aof - the vvehicle.
7. In a brake equipment-‘for vehicles, ,in-com
bihatiomibraking means,~a retardation controller
responsive to the rate of ‘deceleration of said
vehicle :Jfor /:controlling the .degree of applica
tion-of the brakingimeans-in accordancewithea
selected onevof I a plurality of "retardation wsteps,
manual means-for applying the brake in=accord
ance with :ailselected- step, = and -means responsive
to gthe islippin'g of the wheels :for automatically
P1. In‘ a brake equipment for vehicles,vinvcombi
nation, ‘ braking ‘means, a retardation 'icontroller
responsive to the rateof deceleration of said
vehicle for controlling the degree of application
of} said braking " means, manual meansézfor’select
ing a i predetermined ‘rate of retardation 1.of ‘- the
65 1
hiclerfor controlling ‘the degree of application ‘of
said -_braking means, 'manual means for - selecting
a predetermined rate of retardation :of the r-ve- '
bers 159 and ‘56 :of ‘the retardation controller,
lap .position.
‘responsive; to the :ra'te of 1 deceleration 'of said "ave
changingtheiisetting ‘of the retardation controller 1'
to éthejr-hext lower (step.
' ,i8;-,In awbrake equipment-for vehicles, incom
hination,-lbrakingi means, a retardation controller
responsive- to, Eithe rate » of deceleration -,of :;said
vehicle for-controlling the degree ofrapplication 60
vehicle, and. means responsive to .the slipping uof
of :the 'rbrake and provided with 7a ‘plurality 1of
the wheels for automatically'changing thesetting
stepsaof retardation -_ control, manual> means ‘for
of {the retardation ‘controllerito e?ect aprecleter
mined reduction Iin'ithe rate of retardationlof the
of rretardationrcontrol; and :means _ for‘ automati
2. ‘In'i'a rbrakeeequipment‘for vehicles,'in ‘com
bination, braking means, ‘a retardation ‘controller
responsive to the'rate of ‘deceleration of- [email protected]
Ihi'c'le forncontrolling ‘the degree‘ of application'iof
said'lbrakingimeans, manual» means‘ior selecting
aipredeter-mine‘dv rate ' of -' r'etardationfof Jthe1=ve
hicle, ‘Ia'n‘d‘ means'jresp'onsive to‘ the ‘slipping: oftthe
wheels iforeautomatically reducing fthe iselected
rate 'ofiretardationvof the vehicle.
. v
75; .=_ :3; In a ibrake'iequipment tor‘? vehicles, .inccombi
applying-theibraki-ng means in :any selected step
Ycallyveffectingithe'next lower ‘step of retardation 65.
control. and "for signalling --.the operator .upon
slipping of the wheels of Zthe vehicle.
» ,rQJIma .1 brake equipment " for vehicles,- “1300m
bination, ibraking» meansgairetardation-controller
responsive tot-‘the rate of deceleration .of-saidve- 7~.0
hicle i forccontrolling :thevdegree or :applicationvof
the ibrak'ingismeans vand provided with-Ja- plurality
of issteps tot 'areta'rdation vcontrol, . manual -' means
fomapplyingrthe‘rbrake inany ; selected. step .of are
tardation control, andnneansresponsive to :the 7'5
slipping of any of the‘ wheels of the vehicle for
automatically selecting the next lower step of
mined decrease in the rate of rotation of the
wheels of the vehiclefor automatically releas
retardation control.
ing the braking means and selecting the next
lower step of retardation control.
10. In a brake equipment for vehicles, in com-.
bination, braking means, a retardation controller
responsive to the rate of deceleration of said
vehicle for controlling the degree of applica
tion of the braking means and providedwith' a
plurality of steps of retardation control, ‘man
105. ualmeans for applying the brake in any selected
step of retardation control, and means‘ respon
sive to a predetermined decrease in the rate ‘of
rotationof the wheels of the vehicle for auto
matically/releasing the braking means and. se
15. lecting the next lower step of retardation con
a 11. In a brake equipment for vehicles, in com
bination, braking means, a retardation controller
responsive to the rate of deceleration of said ve
20. hicle for;controlling the degree of application
ofv the braking means and provided with a plu
rality. of steps of retardation control, ,manual
means for applyingthe‘braking means ‘in any
selected step of retardation control, and means
25 responsive to securing predeterminedidecreases
in the rate of rotation of the vehicle wheelsfor
reducing the selected rate of retardationstep by
12. In a brake equipment for‘ vehicles, in com
30 bination, braking means,>magnet valves for con
trolling‘ the application and release. of ‘the brak
ing means, means including a plurality of elec
tric circuits for, controlling the degree of appli
cation of the brakes in accordance with ajse
35 lected one of a plurality of retardation steps, a
retardation controller of the inertia type re
sponsive to the rate of deceleration of said ve
hicle and provided with electric contacts for op
erating said magnet valves to control the degree
of application of the braking means in accord
ancevwith a selected one of said steps, and man
ual means for effecting the energization of a
selected number of circuits for applying the
brakesin accordance with a selected step.
vl3. In a brake equipment for vehicles,in com
bination, braking means, electrically, operated
valves for controlling the application and re
15. In a brake equipment for vehicles, in come
bination, braking means, electrically operated
valves for controlling the application ‘and re
leased said braking means, a retardation con
troller of the inertia type responsive to the rate
of deceleration of the vehicle‘ and provided with
electric‘ contacts for ‘operating said valves to
control ‘the degree of application of the brak
ing means and provided with a plurality of steps
of retardation control, manual means for ap~
plying the braking means in any selected step of
retardation‘ control, and means responsive to re
curring predetermined decreases in the rate of
rotation of the wheels for reducing the selected
rate of retardation of the vehicle step by step.
, 16. In a brake equipment for vehicles, in com 20
bination, braking means, electrically operated
valves for controlling the application and release
of the braking means, a retardation controller
of the inertia type responsive to the rate of de
celeration of said vehicle for controlling the de
gree ofapplication of the braking means and pro
vided‘with a plurality of contact members for
controlling said electrically operated valves to
effect a plurality of steps ‘of retardation control,
manualmeans for applying the brake in any
selected step of retardation control, and relay
means actuated upon a predetermined decrease
in the rate of rotation of the Wheels of the vehicle
for automatically interrupting the circuit through
certainof said contact members for reducing the C13 5
selected rate of retardation control.
17. In a brake control equipment for vehicles,
in combination, circuit closing devices associated
with the several vehicle axles, means for operat
ing said several circuit closing devices to circuit 40
closing positions when the associated axle is
rotating above'a given speedand to circuit inter
rupting positions when the speed of the axle falls
below a given speed, a relay, an operating circuit
for said relay including all of said circuit closing 45
devices in series, and means responsive to the de
energization and subsequent energization of the
lease of the braking means, means includinga
relay while the brakes are applied to reduce the
plurality of- electric circuits for effecting the ener
intensity of the brake application.
gization of . said electrically operated valves to
control ‘the degree of, application of the brakes
in accordance [with a selected one of a plural
ity of retardation steps, a retardation controller
of?the inertia type responsive. to the rate‘ of de
celeration‘of said vehicle and provided with elec
tricjpontacts foralso controlling the operation
of said valves to control the degree of appli
cation of the braking means and provided with .a
plurality of stepsyof retardation control, man
18. In a brake control equipment for vehicles, 50
in combination, circuit closing devices associated
with the several vehicle axles, means for operat
ing said several circuit closing devices to circuit
closing positions when the associated axle is
rotating above a given speed and to circuit inter 55
rupting‘positions when the speed of the axlefalls
below a given speed, a relay, an operating circuit
for said relay including all of said circuit closing
devices in series, manually operable means in
ual means for applying. the brakes in any se
cluding cooperating controller contact members 60
lected step. of retardation control, and means
for signalling the operator upon slipping of the
for effecting application of the brakes, said con
tact members being in, or out, of engagement in
accordance as said manually operable means is,
or is not, in brake applying position, a second
and athird relay, an operatingvcircuit for said
second relay including said controller contact
wheels of the vehicle.‘ ‘
14. Ivn'a. brake equipment for vehicles, in com
bination, braking ‘means, electrically operated
valves for controlling the application. and re
70 "
lease of the braking means, a retardation con
members and a contact member of said ?rst re
troller of the inertia type responsive to the rate
lay, a holding circuit for said second relay in
cluding said controller contact members, an oper
ating- circuit for said third relay including said
controller contact’ members, a contact member
of said ?rst relay and a contact member of said
second relay, and means operative when said
of deceleration of said vehicle and provided with
electric contactsfor operating said magnet valves
to control the degree ofapplication of the brake
and provided with a plurality .of steps of re
tardation control, manual means for applying
the brakein any selected step of retardation
control, and‘ means responsive to a predeterw
thirdorelay. becomes energized to "reduce the in
tensity of the brake application.
19.: In: albrake equipment iorlvehiclesain come
bination,qa:brake cylinder, valve means. for‘ 'con-‘
trollingthe ?ow of ?uidunder pressure to and
for controlling the application and. releaseiofcthe,
braking meansymeans for‘ COIItI’OIlII'IgiHIBl-IGQ-i
means‘ for: eiiecting application of the brakes, a
gree of application of the brakes: in accordance
witha selected one of a plurality ‘of retardation
steps including a plurality of circuit conductors 5
retardation'controller responsive to the. rate of
deceleration of the Vehicle for controlling the de
gree‘ of application of the-brakes, and means for.
for controlling the energization of said vapplica'a
tion magnet valve device and. aplurality of cir
cuitconductors'for controlling the energization:
from said brake cylinder,: manually; operable
maintaining . ‘said :valvev .means. in lap . position
of‘ said. release ‘magnet ‘valve device,~manually'
10 when‘the vehicle isat rest-andthewmanually
operable means for ‘connecting selected 'pairsfof 1'05:
operable means is in a brake’ applying position.
20'.v In a briake'iequipmentfor vehicle, incom
binatioma brake cylinder, valve means for con
trolling the-'?ow-oi ?uid under pressure to and
15 from= said' " brake cylinder," manually operable
said conductors to a source'of el'ectricenergy cor-;
responding.- to the desired maximum'rate of re
means for’ effecting: applicationlof the‘ brakes,
a retardation: controller responsive to‘ the rate-of
deceleration of'the vehicle for decreasing the de-,
gree'rof application of thebrakes, and relay means
20" ‘operative upon the stopping 'of the vehicle for
preventing an increase in the degree of applica
tion of the-brakes.
21’. ‘In a brake equipment for'vehicles, in com
, bination, a brake cylinder, valve means for con
25 1
trolling the how of fluid under pressure to and
from: said ‘brake cylinder, ' manually - operable.
means for" effecting application of the brakes, a
retardationcontrol-ler responsive‘to the rate-:of
deceleration of the vehicle forcontrolling the de30
gree of application of ‘the brakes, relay-means
operative uponvthe stopping of thevehicle for
preventing the ?ow of ?uid under pressure to said‘
brake cylinder, and means for~ preventing. the
?ow of? ?uid‘ under pressure lfromsaidi brake
"cylinder while said manually operable means: is
in a brake applying position.
22; In a brake equipment for vehicles; in com
bihation, braking means, magnet'valveldevices
for controlling the application and; release of the‘
40 braking-means, means including: aplurality'of
electric circuits for controlling the. degree oflape
plication of the‘ ‘brakes in‘ accordance .With a
selected one of‘ a plurality of retardation steps,
manually >- operable means for‘ "connecting a
45, selected-number of said circuits-to: a source of.
electric energy for effecting. the energization of
said magnet valve devices, a retardation con
troller ofthe' inertia type responsive to the rate:
of deceleration-ofnthe' said vehicle and provided
50 with electric c0nta'cts forconnectingsaid magnet
valve'devices to selected conductors in accordance
with‘ the rate of: retardation 1 of . the vehicle. to’
control the degree of application of the braking.
means in accordance with ‘a selected one ofsai'd
'23. 'In' a brake equipment for vehicles,‘ .in com;
bination, braking- means, magnet: valve devices
for controlling the application and release of. the.
braking means, means for controlling the degree
so of application of the brakes invaccordance with
a selected one of a plurality of retardation-steps
including a plurality of electric circuit conduc
torspmanually' operable means for connecting a
selected number of vsaid conductors to‘ a source
of electric energy for effecting the energization
of‘said- magnet'valvedevices; a retardation con-
troller comprising contact members connected,
respectively; to‘ said‘ several" conductors, and
‘means responsive to the rate of retardation of
' the vehicle for connecting said magnet valve
device to selected ones of said electric conductors.
'24. In a brake equipment for vehicles; in ‘com
- bination,’ braking means, an application magnet
75 , valve device'and a release magnet valve device
tardation- of the vehicle, a retardationi controller
o?‘thetinertia type responsive to the-rate of de
celeration of the vehicle and» provided with ’elec'-_
tric contact members connected respectively'~-td ,
said severalaelectric-conductors and correspond
ing to steps of retardation control-,~and*means
responsive‘ to the operation of 'said' retardation
controller in, response to- changes ‘in the rateof
retardation of the vehicle foriselectively coir‘-Z
necting- said application magnet valve device and
said release-magnet valve Idevice to'retardation
control =‘contact member corresponding to‘ ‘ ‘the
speed of‘ the vehicle.
, '
725i In'1a brake equipment for-vehiclesdn com‘
bination, braking meansyan applicationlma'gnet
valve device and a release magnet valve device
for‘ controlling’ the application and- release of" the
braking means‘, means for controlling the degree
of application of the brakesdin accordance‘with“ a
selected one of‘a plurality of retardation steps in:
cluding' a plurality of circuit conductors'for corr-j
trolling the energization of said application ‘mag-j.
net valve device and a plurality of circuit con
ductors- for controlling the energization'of' said‘
release magnet valve device, manually operable
means-for connecting selected pairs-‘of said con‘;
ductors -to a source of electric energy. -corre-‘
sponding to the desired maximum 'degree'of' re‘
tardation of the vehicle, a retardation controller
of_ the inertia type responsive to the rate of de
celeratin ofthe vehicle and provided with 'elec'a
tricv contact ‘members connected; respectivelyito‘
said several-electric- conductors and correspondw *3
ing to steps of- retardation control, and means.
responsive to the ‘operation of 'said' retardation
controller" in response to‘ changes in the rate" of
retardation‘of thej vehiclefor selectively‘ connect-~ 5Q
to. retardation
device andsaid'
control contact‘ members ‘corresponding to‘ the speed;
of ‘the vehicle, switch ‘contact members connected
in said several. conductors between said inanual- 55
means responsive
and to
sliding of the
wheels for automatically operating said‘ switches
to interrupt the circuits-through'said conductors
to‘effecta predetermined reduction, in therate of: Gun
retardation of. the vehicle.
26';v Ina. brake equipment for vehicles, in. com
bination‘, braking means, magnet valve devices.
for controlling. the application andrelease-of the
braking means, means for controlling the'degree 65.,
one of
of athe
brakes of.
in retardation
accordance steps
including a plurality of electric circuit-conduc
tors, manually .operable means for connecting .a
selected number of said circuit. conductors to a 79,.
source of electric energy, a retardation controller
of the inertia .typeresponsive to the rate of de-,.
celeration‘ of said‘ vehicle and provided witha
plurality of contact members connected, respect
tively} to said Several conductors, means respone 75,
sive to the rate of retardation of the vehicle for
connecting said magnet valve devices to selected
ones of said electric conductors, switch contact
members connected in said several conductors
5 between said manually operable device and said
retardation controller, and means responsive to
the slipping of the wheels for automatically op
erating said switches in a step by step manner to
progressively interrupt the circuits through said
conductors to progressively effect a. predetermined
step by step reduction in the rate of retardation
of the vehicle.
Patent No. 2,048,318.
July 21, 1936.
It is hereby certified that error appears in the printed specification of
the above numbered patent requiring correction as follows: Page 5,‘ first
column, ‘line 25, claim 11, for the word "securing" read recurring; page 6,
first column, line 12, claim 20, for "vehicle" read vehicles; andv that the
said Letters Patent should be read with these corrections therein that the
same may conform to the record of the case in the Patent Office.
Signed angi sealed this 2nd day vof March. A. D. 1937.
(Seal )
Henry Van Arsdale
Acting Commissioner of Patents.
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