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Патент USA US2071722

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Feb. 23, 1937.
, G. w. BAUGHMAN
2,071,722 "
ELECTROPNEUMATIC BRAKE
Filed June l2, 1934
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INVENTOR
GEORGE W BAUG HMAN,
A TTORN
Patented Feb. 23, 1937
2,071,722
UNITED STATES PATENT OFFICE
2,071,722
ELECTROPNEUMATIC BRAKE
George W. Baughman, Edgewood, Pa., assignor to
The Westinghouse Air Brake Company, Wil
merdîng, Pa., a corporation of Pennsylvania
Application June 12, 1934, Serial N0. 730,230
14 Claims. (Cl. 303-20)
My invention relates to brake equipment for tion relay 5 and a release relay 6 in accordance
vehicles and more particularly to an electro
pneumatic brake equipment.
It has been proposed to provide a brake equip
,~ ment having a brake valve device adapted, upon
movement by the operator to a given position,
to effect the supply of fluid under pressure to
the brake cylinder until the brake cylinder pres
sure has been increased to a degree correspond
ing with the position of the brake valve handle,
when the supply of fluid under pressure to the
brake cylinder is automatically out off, and, upon
movement of the handle to another given posi
tion, to release fluid from the brake cylinder to
a degree corresponding with the position of the
brake valve handle, when the further release of
fluid from the brake cylinder is cut off. This type
of brake valve device is known as a self-lapping
brake valve in which the self-lapping action op
erates on a pressure basis.
One
brake
trolled
and in
object of my invention is to provide a
equipment in which the operator con
mechanism is of the self-lapping type
which the self-lapping action operates on
y a time basis.
.
A more specific object of my invention is to pro
vide an electro-pneumatic brake equipment in
which the brake equipment is self-lapping on a
time basis.
Another object of my invention is to provide
an electro-pneumatic brake equipment in which
- the time of increasing or decreasing brake cylin
der pressure is a function of the amount of
movement of the brake control handle at the ex
i piration of which time the brake is self-lapping.
Other objects and advantages of my invention
will be apparent from the description of a specific
embodiment thereof taken in conjunction with
the accompanying drawing in which
Fig. 1 is a diagrammatic view of apparatus and
40
circuits illustrating one preferred embodiment of
the invention,
Fig. 2 is an elevational view of the controller,
partly in section, and
Fig. 3 is a plan view of the controller, partly
in section, showing the controller handle in
service position.
Referring to the drawing the numeral I repre
sents a brake cylinder of a fluid pressure brake
adapted to be supplied with fluid under pressure
from the reservoir 2 in accordance with the op
eration of an application magnet valve device 3
and from which fluid under pressure is released
by the operation of a release magnet valve device
x55~4-that are controlled, respectively, by an applica
with the operation of a controller 1.
The con
troller 'l comprises a stationary casing 8 having
a handle 9y pivotally mounted at II on a bracket
I2 extending outwardly from the casing, and 5
carrying a contact member I3 that is adapted to
engage a contact segment I4 when the handle 9
is positioned in the service application zone.
A lap controlling device I5 is provided on the
controller, comprising a tubular casing 2| that 10
is movable with respect to the casing 8 and is
provided with slots in its opposite sides through
which the brake handle 9 extends.
Means is
provided for biasing the lap controlling device
with respect to movements of the brake handle 9, 15
and comprises a rod I6 provided with an abut
ment Il for engaging the handle 9, and that is
biased toward the central portion of the tubular
casing 2| by a spring I8 pressing against the
abutment Il and having its outer end in engage- 20
ment with a cap nut 20 in the outer end of the
tube. The rod I6 extends through an opening in
the cap nut 20, and is provided with a head I9
on its outer end to limit its movement toward
the left. The opposite end of the casing 2l is
provided with a rod 22 having an abutment 23
on the inner end thereof and a head 24 on the
outer end thereof. The rod 22 extends through
an opening in a cap nut 30 at the outer left
hand end of the casing structure 2 I, and a bias
ing spring 25 is positioned between the cap nut
30 and the abutment 23 for forcing the abut
ment toward the right into engagement with the
brake handle 9. Contact ñngers 26 and 28 are
carried, respectively, by the abutments Il and
23 for engaging contact members 2l and 29, re
spectively, carried on the brake handle 9.
In order to provide a time delay action in the
operation of the lap controlling device, after
operation of the brake handle 9, a retardation 40
device is provided which, as illustrated, comprises
a rack 3I on the under side of the casing 2| for
engaging the teeth of a pinion 32 mounted on the
shaft 34 that is supported by the pivots 35. A
metallic disc or vane 33 of electrically conducting 45
material, such as copper or aluminum, is mount
ed on, and rotates with, the shaft 34, and is posi
tioned between preferably permanent >magnets 36
and 3l. The desired amount of time lag between
the movement of the lap controller I5 and the
handle 9 may be provided by selecting the proper
relation between the size of the metallic disc
and strength of the permanent magnets, and
also by interposing a gear train between the
rack and pinion if found necessary.
55
2
k2,071,722
The application magnet valve device 3 com
prises a casing 38 provided in its lower portion
with an application valve chamber 39, contain
ing a valve 4I for controlling communication
from valve chamber 39 to a port 42 and an out
let chamber 43, that is connected by a passage
and pipe 44 to the brake cylinder I. The valve
chamber 39 is connected by a passage and pipe
45 to the reservoir 2, and a spring 43 is pro
vided therein for biasing the valve 4I upwardly,
toward its seated position, to insure closure of
the valve unless it is actuated downwardly by
energization of the magnet winding in the up
per portion of the casing 3S. The release mag
15 net valve device 4 is provided with a casing
41 having an inlet chamber 48 in the lower por
tion thereof that is connected by the passage 49
to the passage and pipe 44, and connected by
a passage 5i to the valve chamber 52. A valve
20 53, contained in the valve chamber 52, con
trols communication from the passage 5I, open
ing into the inlet chamber 48, to chamber 52
and to the atmosphere through passage 55. The
inlet chamber 43 contains a spring 54 for bias
25 ing the valve 53 to its unseated position to nor
mally maintain open communication between the
brake cylinder I and the atmosphere. The valve
53 is adapted to be actuated downwardly to its
seated position upon energization of the magnet
30 winding of the magnet valve device 4 in the up
per part of the casing 41.
In the position of the brake handle 9 illus
trated in Fig. 1, which is the running or brake
release position of the equipment, the applica
35 tion relay 5, and the release relay 6, are both
deenergized, since the contact member I3 is out
of engagement with the conducting segment I4.
The contact member 83 of the application re
lay is, therefore, in its circuit closing position,
40 while the contact member 59 of the release re
iay is in its circuit interrupting position. If the
operator desires to apply the brakes, the handle
9 is moved in a counter-clockwise direction with
respect to the stationary casing 8 an amount de
45 pendent upon the desired degree of application
of the brake, as, for example, to the position illus
trated in Fig. 3. Upon eng-agement of the con
tact member I3 with the conducting segment I4,
a circuit is completed from a source of energy,
such as the battery 88, through conductor 6I,
conducting members I4 and i3, conductor 82,
the contact member 63 of the relay 5, conduc
tor 84 to the winding of the application mag
net valve device 3, and by conductor 85 to ground
and to the source of power 59, thus operating
the application magnet V-alve to its lower posi
tion and permitting the flow of air under pres
sure from the reservoir 2 into the brake cylin
der I. Upon engagement of the contact mem
ber I3 with the conducting segment I4 a cir
cuit is also completed through conductor 52, con
tact member 2l carried by the brake handle 9,
ringer 26, conductor 66, coil 5l of the release
relay 5, and by conductor G8 to the source of
power, thus operating the relay 6 to close a cir
cuit through the contact member 69 extending
from the conductor 62, conductor 1I, the wind
ing of the release magnet valve device 4, and
conductor 'i2 to the source of power, thus ener
gizing the release magnet valve to operate it
70 downwardly to cut off communication from the
brake cylinder I to the atmosphere through ex
haust passage 55.
The coil springs I8 and 25 on opposite sides
of the brake handle 9 tend to position the mov
75
able casing structure 2I of the lap controlling
device so that its middle point is maintained in
line with the handle 9. Upon movement of the
brake handle 9 from the position shown in Fig.
l to the position shown in Fig. 3, the abutment
I'I and rod I6 are forced toward the right com
pressing the spring I8 and the pressure of the
compressed spring acts to shift the casing struc
ture 2| toward the right until the cap nut 20
eng-ages the head i9. The retarding or damp
ening device, comprising the vane 33, introduces
a time delay into the movement of the casing
2l the duration of which depends upon how far
the brake handle 9 is moved from the position
shown in Fig. l. Upon completion of this move
ment the Contact ñnger 28, carried by the abut
ment 23, engages the contact member 29, carried
on the brake handle 9, completing a circuit
through conductor 13, the winding 14 of the
application relay 5, and conductor 'l5 to the
source of power, thus energizing the relay 5
and causing movement of its contact member
63 upwardly to a circuit interrupting position to
deenergize the magnet winding of the applica
tion magnet valve device 3, so that the valve
4i is moved to its seat by spring 46. Both the
application magnet valve device 3 and the re
lease magnet valve device 4 are now in their
closed positions, thus maintaining the brake cyl
30
inder supply and release passages lapped.
Should the operator desire to apply the brakes
with incr-eased force, the brake handle 9 is moved
further toward the right thus again separating
the Contact members 28 and 29 and deenergiz
ing the application relay 5 which drops to its
illustrated position and completes a circuit
through the application magnet Valve device 3,
so that the valve 4I is moved to its open position
and permits ñuid under pressure to again iiow
from the reservoir 2 to the brake cylinder I to
increase the degree of application of the brake.
rThe amount of this increased application of the
brake will depend upon the amount of move
ment of the brake handle 9 since the further the
handle is moved the longer will be the time re
quired to move the contact member 28 into en
gagement with the Contact member 29, to again
energize the application relay 5 and interrupt
the circuit to the winding of the application
magnet valve 3.
If the operator desires a lesser` f
degree of application of the brake, the brake
handle 9 is moved toward the left, thus inter
rupting the circuit through contact members
26 and 2l', deenergizing the release relay 6, and
consequently the winding of the release magnet
valve device 4, causing the valve 52 to open and
permit the escape of ñuid under pressure from
the brake cylinder I to the atmosphere through
exhaust port 5I. When the handle 9 is moved
toward the left, the spring 25 is compressed, thus
biasing the casing structure 2l toward the left,
"Gl CH
to carry the contact member 26 in that direction
until it again engages the contact member 21,
at which time the release relay 6 is again ener
gized to close a circuit for energizing the wind (I5
ing of the release magnet valve device 4, thus
operating it to its closed position to maintain
pressure within the brake cylinder I.
It will be noted from the above description that
a given movement of the brake handle 9 toward 70
the right will cause the application magnet valve
device 3 to be energized and operated to its open
position for a specific time, at the expiration of
which the application magnet valve device 3 is
deenergized and closed.v The release magnet 75
2,071,722
3
valve device 4 will however' "remain energized
thus maintaining the brakes applied. Subse
4. In a brake equipment for vehicles, electri
cally operable means for controlling the appli
quent movement of the brake handle 9 in the cation and release of the brakes, a brake handle
same direction will cause the application magnet for controlling the energization of said electri
5 valve device 3 to be again energized for times cally operable means, cooperating contact mem
proportional to the amount of movement of the bers effective for initiating operation of said
handle 9 to correspondingly increase the degree electrically operable means in any service posi
of application of the brake. A movement of the tion of the handle, a lap controlling element
brake handle 9 in the opposite direction, that is, biased to a predetermined position relative to
l0 toward the left, will result in the deenergization the handle and a retarding device for delaying
l0
of the release magnet valve device 4, thus per
movement thereof to said predetermined position
mitting this valve to open for a duration of time following movement of the handle, and means
that is proportional to the amount of movement comprising cooperating contact members effec
of the handle 9 to correspondingly decrease the tive when said lap controlling element is in said
15 degree of application of the brake. Upon move
predetermined position for holding the electri
ment of the handle 9 to the left sufficiently to cally operable means in lap condition.
interrupt the circuit through the contact member
5. In a brake equipment for vehicles, electri
I3 and the segment I4 the release relay 6 will cally operable means forr controlling the appli
be deenergized resulting in a complete release cation and release of the brakes, a brake handle
20 of the brake.
for controlling the energization of said electri
While I have illustrated and described one pre
cally operable means. cooperating contact mem
ferred embodiment of my invention it will be bers effective for initiating operation of the brakes
apparent to those skilled in the art that many when the handle is positioned in the application
changes in the circuits and apparatus described zone, a lap controlling device biased to a pre
25 may be made Within the spirit of my invention, determined position relative to the handle, a re
and I do not Wish to be limited otherwise than tarding device for delaying movement thereof to
by the scope of the appended claims.
said predetermined position following movement
Having now described my invention, what I of the handle, and means comprising cooperating
claim as new and desire to secure by Letters contact members effective when said lap control
30 Patent, is:
ling device is in said predetermined position for 30
1. In a brake equipment for vehicles, in com
holding the electrically operable means in lap
bination, a brake cylinder, electrically operated condition and effective, upon movement of said
valves for controlling the application and release
of fluid under pressure to and from said brake
35 cylinder, a brake handle for controlling the op
eration of said valves, an application relay and
a release relay, means effective upon movement
of the handle to a service position for effecting
energization of said release relay to prevent re
40 lease of said brake, and timing means effective
at a predetermined time thereafter, dependent
upon the amount of movement of said handle,
for effecting energization of said application re
lay to prevent further increased application of
45 said brake.
2. In a. brake equipment for vehicles, in com
bination, a brake cylinder, electrically operated
valves for controlling the flow of fluid under pres
sure to and from said brake cylinder, a brake
50 handle for controlling the operation of said
valves, means responsive to the movement of the
handle to a service position for effecting an ap
plication operation of said valves, means biased
upon movement of the handle for interrupting
55 such operation, and retardation means associated
therewith for introducing a time delay in the op
eration of said interrupting means that is sub
stantially proportional to the amount of move
ment of said handle.
60
3. In a brake equipment for vehicles, in com
bination, a brake cylinder, electrically operated
valves for controlling the flow of fluid under pres
sure to and from said brake cylinder, a brake
handle for controlling the operation of said
65 valves, means responsive to the movement of the
handle to a service position for effecting an ap
plication operation of said valves, means biased
upon movement of the handle for interrupting
such operation after a predetermined time and
70 for interrupting subsequent operations of said
valves at predetermined times after the move
ment of said handle to effect greater orI lesser
brake application, said several predetermined
times being substantially proportional to the
75 amount of movement of said handle.
handle in the one or in the other direction Within
the application zone, to cause an increasing ap
plication or a decreasing application of the 35
brakes.
6. In a brake equipment for vehicles, electri
cally operable means for controlling the appli
cation and release of the brakes, a brake handle
for controlling the energization of said electri 40
cally operable means, cooperating contact mem
bers effective for initiating operation of said elec
trically operablemeans when the handle is posi
tioned in the service application zone, a movable
lap controlling device comprising a movable ele 45
ment, contact members carried thereby, biasing
means for biasing said movable element toward a
definite position relative to the handle, and time
delay means for retarding the movement of said
lap controlling device,- said contact members be 50
ing effective to maintain circuits for holding the
electrically operable means in lap condition when
said movable element is in said deñnite position.
7. In a brake equipment for vehicles, an elec
trically operable application valve and an elec
trically operative release valve for controlling
the application and release of the brakes, a brake
handle for controlling the energization of said
electrically operable valves, an application relay
biased to a circuit closing position, cooperating 60
contact members effective for initiating opera
tion of said application valve by said application
relay when the handle is positioned in the ap
plication zone, a lap controlling device biased to
a predetermined position relative to the handle
and a time delay device for permitting slow move
ment thereof to said predetermined position fol
lowing movement of the handle in either direc
tion, and means comprising cooperating contact
members effective when said lap controlling de 70
vice is in said predetermined position for operat
ing said application relay to effect closure of said
application valve while holding the electrically
operable means in lap condition.
8. In a, brake equipment for vehicles, an elec 75
2,071,722
4
trically operable application valve and an elec
tricaliy operable release valve for controlling the
application and release of the brakes, a brake
handle for controlling the energization of said
electrically operable valves, an application relay
biased to a circuit closing position, cooperating
contact members effective for initiating operation
of said application valve through said applica
tion relay when the handle is positioned in the
10 application zone, a lap controlling device biased
to a predetermined position relative to the handle,
a time delay device for permitting slow movement
thereorn to said predetermined position following
movement of the handle, means comprising co
15 operating contact members efiective'vvhen said
handle is positioned in the applica-tion zone for
holding said release valve closed, and means com
prising cooperating Contact members effective
when said lap controlling device is in said pre
20 determined position for holding said application
valve closed to maintain the brakes applied.
9. In a brake equipment for vehicles, electri
cally operable means for controlling the appli
cation and release of the brakes, a brake handle
25 for controlling the energization of said electri
cally operable means, cooperating contact mem
bers effective for initiating operation of said elec
trically operable means in any service position oi
the handle, a lap controlling device comprising
30 a movable member extending on either side of
the handle and provided with opposing springs
for biasing said member in either direction toward
a predetermined position relative to the handle,
and a retardation device for delaying movement
35 thereof comprising means eiiective upon opera
tion oí said biasing means ~lor eiiïecting an oppos
ing force to limit the rate or" movement of said
movable member in response to movement of
said handle, and means 'comprising cooperating
40 contact members eiîective when said lap control
ling element is
said predetermined position
for holding the electrically operable means in
position.
l0. In a
equipment for vehicles, elec
trically operable means for controlling the appli
cation and release of the brakes, a brake handle
for controlling the energization of said elec
trically operable means, cooperating contact
members eiïective Íor initiating operation of said
50 electrically operable means in any service posi
tion of the handle, a lap controlling device ocm
prising a movable member extending on either
side of the handle
provided with opposing
springs for biasing said member in either direc
tion toward a predetermined position relative to
the handle, and a retarding device for delaying
movement of said member to ei'lîect a deiinite
time interval in the movement thereof to said
predetermined position following movement of
the handle, and means comprising cooperating
contact members e‘liective when said lap control
ling element is in said predetermined position
`for holding the electrically operable means in
lap position.
l1. In a brake equipment for vehicles, elec
trically operable means for controlling the ap
plication and release of the brakes, a brake handle
for controlling the energízation of said elec
trically operable means, cooperating contact
members eirective for initiating operation of said
electrically operable means when the handle is
positioned in the service application Zone, a lap
controlling device comprising a movable element,
Contact members carried thereby, biasing means
for biasing said movable element in either direc
tion toward a definite position relative to the
handle, and time delay means for retarding the
movement of said lap controlling device in either
direction to effect a predetermined time interval
between movement of said handle and the com
pletion of the resulting movement of said mov
able element to said definite position, lsaid con
tact member being eiïective to maintain circuits
for holding the electrically operable means in
lap position When said movable element is in said
deñnite position.
l2. In a brake equipment for vehicles, elec
trically operable means for controlling the ap
plication and release of the brakes, a brake han
dle for controlling the energization of said elec
trically operable means, cooperating Contact
members effective for initiating operation of said
electrically operable means when the handle is
positioned in the service application zone, a lap
controlling device comprising a movable ele
ment, contact means carried thereby, biasing
means for urging said movable elements in either
direction toward a definite position relative to
the handle upon movement of the handle there
from, and a retardation device for limiting the'
rate of such movement to provide a time -delay
that is substantially proportional to the amount
oi said movement, said. Contact members being
effective to maintain circuits for holding the elec
trically operable means in lap position when said
movable element is in said deñnite position.
i3. In a brake equipment for vehicles, means
for controlling the application and release of the
brakes, a brake handle for controlling the oper 40
ation of said means, a lap controlling device com
prising a movable element, biasing means for
urging said movable element in either direction
toward a definite position relative to the han
dle upon movement of the handle therefrom, 45
and a retardation device for limiting the rate of
such movement to provide a time delay that is
substantially proportional to the amount of said
movement, said lap controlling device being ef
fective for maintaining the brake controlling 50
means in ~lap position when said movable ele
ment is in said deñnite position.
14. In a brake equipment for vehicles, means
for controlling the application and release of the
brakes, a brake handle for controlling the oper 55
ation of said means, a lap controlling device
comprising a movable member extending on op
posite sides of said handle, biasing means on
opposite sides of said handle for centering said
movable member With respect to said handle, and 60
a retardation device for limiting the rate of such
movement in either direction to provide a time
delay that is substantially proportional to the
amount of said movement, said lap controlling
device being effective for maintaining the brake
controlling means in lap position when said Inov
able member is centered with respect to the
handle.
GEORGE W. BAUGHMAN.
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