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Патент USA US2133580

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- Oct. 18, 1938.\
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’ D. F‘. sEARLE
’
AIR
BRAKE
'
2,133,580
SYSTEM
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Filed July 19', 1937 -
FIG. I.
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INVENTOR:
DUDLEY _ F.
BY-
2
SEARLE
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[ATTORNEY
Home... 18,1938’
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2,133,580
‘UNITED STATES, PATENT OFFICE
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2,133,580
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AIR BRAKE sxs'rarr
Dudley F.‘ Seal-1e, omens, cam.
Application
-5 ‘July
Claims.
19, 1931,
(01.‘ abs-5o)
serieino.1‘ 154,469
inventionyrelates to improvements in air 3
“Fig, '1‘ is a diagrammatic view of-acontrol valve
T‘ brake systems, ‘and more partlcularlytogradu-H
' a,
constructed in accordance with this invention
,atingcontrol valves therefor.
‘ >
v‘ ,
~
shown. in plan view connected to the essential
Among the‘objects ofthis-inventiop‘is to pro- ‘elements of a; conventional vacuum air brake
5 vide a control valve which will automatically vsystem which is shown in side elevation.
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5
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maintain the brake power chamber ata constant
' Fig. 2 is an enlarged. vertical section taken
pressure so that the brakes can be held applied: along the line II—II_in Fig. 1 of the control valve.v
tov any desired extent without variation for- a
I : Fig.3 is a horizontal section taken alongthe
, prolonged period.
10
line IIIV—’III in Fig. 2 and showing the valvein
._ Another object is to renderjthe control valve
an operating position.
Q
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10
capable of maintaining various pressures'in the
1 Fig. i is’a similar viewlof the same in the posi
v, brake
to thechamber
distancewhich
that the
areaccurately
control valve
proportional
is vmoved- _tion
Fig.
for5 full
is. a application
detail view of
in the,
sidebrakes.
7elevation‘of the
.i
from» neutral position. 1
15
,
»
‘
‘ valve plug showingthe tapered pressure control
Another object is to provide a graduating con-V ._ groove.‘
trolvalve which will automatically, maintain any
. desired. pressure throughout the range from zero
-
l5
- ‘n detail, the construction illustrated in the
drawing comprises the valve body I secured. to a
pressuretothe maximum pressure obtainable.‘ . _ , suitable support 2 by the‘ screws 3 asin 13713-1. It
Anotherobje'ct is toprovide unrestricted com- has the central opening 4 therethroug'h‘ which‘
‘
20- munication between the brake chamber and the
pressure source for emergency operation of the
brakes. .
,
tapers toward its upper end. The bosses! and I 20
extend from opposite sides of the valvebody and
~
are internally threaded.
‘Another object is to provide a valve of simple
The pipe V is screwed into the boss 5 and leads
construction, inexpensive of , manufacture, and
to vasource of sub-atmospheric air pressure’sueh
zo?permanently reliable in‘operation.
-
as the intake motor manifold; 8 of an‘ internal 25
. In prior valves of the present type, tapered
combustion motor.. The pipe C is similarly con- -
groovesv were provided which cooperated with nected to the boss 6 and communicates with the
boththe pressure supply port. and the atmos- brake power chamber vIt) havingthe usual dia
phelv‘ic DQIt- The brake chamber port was thus in _ phragm ll therein.’ 'I'he‘ports l2 and I3 provide
30, communication with boththe atmosphere and . communication between the central opening I 30
the source of pressure 'to a variable extent. The . and the pipes V vand C respectively. :The ports
existence of two variable quantities rendered it
.
intersect the opening I at substantially 120 de
. dif?cult to design prior valves so that the pres- 1 grees from each other.
,
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.
.
sure maintained in.the brake chamber would be I. The port It is providedinthe-opposite side of
35. accurately proportional to the extent of the move- ‘the opening 4 substantially‘equidistant from the 35
ment of the control valve. ‘ It has been found, in
ports I! and i3. It communicates with the pas
practice; in thecase of sub-atmospheric pres- sage Awhich leads to the atmosphere through
sure brakes for motor vehicles, that under this . the bottom of the body I. Anairlcleaner is pro
v ,
teaching of th8"l)1'i01‘,B_-I‘t,1,t is impossible to maing 40 min a brake cylinder pressure in the range be~
tween eight and twenty inches of vacuum
.
vided for the air entering the passage l5.- vIt ~
consists of theperforated cup l6 secured to the 40
Broadly stated, the present invention consists,
in part, of providing a tapered channel for coop-
bottom of the valve body-and containing the
?brous filtering material II. The perforated disk '
l8 retains the: material II» in place within the
erating with the pressure port of a control valve,
cup [6,
'45.,a'nd a groove of constant cross-sectional area for'
. >
, ~ '
The tapered valve plug I9 is a smooth sliding 45 -~
‘cooperating with the atmospheric port.
?t within‘the opening “4.. It has the stem 20 pro
_ , Other objects and advantages appear as this
T‘ descriptionprogresses.
‘
. In .the specification I and the accompanying‘
jecting upwardly therefrom. The manual oper
ating handle 2| has its hubv 22 ?xed on the stem
20‘ by. means of the transversepin 23. The handle
50, drawing, the invention is disclosed in its pre- _ 2| may have a conventional friction pawl (not 50
ferred form. It is, however, tobeunderstood that shown) cooperating with the notches 24, pro
the invention is not limited to this form because vlded' on the body i, see, Fig. ,1}, to retain the
, modifications may be made within the purview
handle in the position to whichit is moved by the
of the claims following the description.
55,
In the oneshe'etof drawings:
operator.
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V _ ,
,
i
.The bottom of the hub 22 has the annular 55
2.
2,188,580
..
groove 2| therein. The marcel spring 26 con?ned , handle II to the'extreme left. The plug I I then
in this groove expands against the top of the body assumes the position shown in Fig. 2. The por
' I and draws the tapered plug l9 into‘ ?rm en
tion :33 covers the port I! thus closing 08 all
gagement with the'walls o! the opening ‘4.;
communication to the intake manifold I. Free
The plug ‘I! has the chordal recess 21‘ therein communication from‘ the atmosphere to the
which is substantially ot the same cross sec
chamber Ill‘is provided by the recess 21. "This
. tional area as the ports l2, I3, and I4. When “fully releases the brakes with rapidity.
the valve is in neutral position, the recess 21 reg
It will be‘ obvious to those skilled in the art that
isters with the ports ll and it which communi
the tapered channel I. and the groove I! of
10 cate with the chamber I0 and the atmosphere constant cross sectional areas could be transposed
respectively. The channel I. in the side of the
plug ll extends from the recess 21 in a‘counter
clockwise direction and diminishes in both width
and depth until it vanishes at a point near the
-> is passage H, see Figs. 3 and 5. The groove 12 is of
without a?ecting the operation of the valve.
Having'thus described the invention‘, what is
claimed and desired to be secured by Letters‘
Patent is:
.
.
'1. In an air brake system having a source of
uniform width and depth and extends- from the ‘ pressure and a power chamber therein; a control .
‘slot 21 in a clockwise direction and cooperates _ valve body having three ports therein leading to
with the passage Il,_see Fig. 3. v '
,
The apparatus operates substantially as fol
20 lows:. When the valve is in neutral position as
shown in Fig. 2, the chamber II is maintained at
atmospheric pressure "by air being free to ?ow
from the atmospheric duct A, through the recess
21 registering'with the ports I I andv ll, into the ‘
pipe’ C leadinglto the chamber.
said pressure source, said chamber, and the at
mosphere respectively; and a movable valve mem
-ber adapted to cooperate with said ports and
having a neutral and intermediate andextreme
operative positions, said valve member having a
recess therein adapted to provide unrestricted
communication between the power chamber port
and the atmospheric port respectively when said, 25
‘
To apply the brakes the handle 21 is manually ‘
moved to the right a distance depending upon
the extent“ of brake application desired. This
rotates the‘ plug I 9 in a counterclockwise direc
'30 tion. The recess 21 passes out of’ registry'with
valve member is in said neutral position, said
valve member having a greatly restricted groove
therein adapted to provide ‘communication be
tween vsaid atmospheric’ and said chamber‘ port
when said valve member is in an intermediate
the port II. ‘The port It, however, remains in ' operative position and a second restricted groove
communication with the port II through the re
arranged to be out’of registry with said pressure
stricted groove 32. The‘ end of they channel ‘I0 port when said valve member is in the neutral
position but being brought into registry there
moves into registry with the port i2.
Air ?ows at a‘limited rate from the port ll, with when said valve member is moved to an
35
intermediate operative position, said valve mem
past the restriction at 3| into the intake mani
ber being arranged to bring the recess into a
told I.‘ The reduced pressure in the recess 21
position to provide unrestricted communication
causes air to ?ow thereinto from ‘the atmos
phere through the‘ tapered channel 32. The between said pressure source port and said cham
recess 21' then reaches an equilibrium pressure ber port when said valve member‘ is in: the ex!
which depends upon the relative sizes of the air treme operative position.
' ‘ passages a?orded to the manifold 8, ‘past the
restriction 30, and from the atmosphere over the
taperedchannel 32. The pressure in the power
.45 chamber It falls until it equals the equilibrium
‘ pressure. in the recess 21.
It then remains‘ con
stant. .The brakes are thus applied and held
applied to a constant extent.
'
‘
This equilibrium pressure may 'be raised or
5,, lowered by moving the handle 21 to the-right or
2. In an air brake system having a source of
sub-‘atmospheric pressure and a power‘ chamber
therein; a control valve body having three ports '
therein connected to said pressure source, said 46
chamber, and the atmosphere respectively; and a
movable valve member adapted to cooperate with
said ports and having neutral and operative posi
tions, said valve member having'a recess'therein
left respectively. This rotates‘the tapered chan
‘nel In with respect to the port ‘l2 thus either
increasing or decreasing the size of the air pas
adapted vto provide unrestricted communication
between said atmospheric and chamber ports
when said valve member is in said neutral posi
tion, said valve member having a restricted
sage therethrough with‘ respect to the constant
groove therein of constant cross sectional area
55 size of the opening‘ through the groove 32.
The ‘ ‘and adapted to provide communication between
groove 32 of ~ constant cross‘ sectional area .saidatmospheric port and said chamber port
throughout renders it possible to arrange the » respectively when said vvalve member is moved
dimensions of the single tapered slot 30 to provide ‘out of said ‘neutral position, said valve member
‘ for accurate control of the brakes throughout, the
also having a tapered channel therein arranged
full range of'operating pressures desired:
- so as to be out of registry with said pressure port
To apply the brakes fully, the handle 2| is when said valve member is in the neutral position
moved to the extreme right. This moves the and adapted to provide progressively less re
plug 19 into the position shown in Fig. 4, with the stricted communication between said pressure
recess 21 registering vwith both the port II and source port and said chamber port when, said
valve member is moved from neutral position.
785 the port i2. The groove 32 passes out of reg- 'istry with the port It.
This cuts or: the power
chamber ill from communication with the at
mosphere. The recess 21 provides’ unrestricted
. communication between the power chamber Ill
3. In an air brake system ‘having a source of
subatmospheric pressure and a power chamber
therein; a control valve body having three ports
therein connected to said pressure source, said
70 and the manifold 8., The pressure in the cham
chamber, and the atmosphere respectively; a 70
ber l0 immediately fallsto the subatmospheric valve member adapted to‘ cooperate with said
pressure in the manifold, rapidly applying the ports and having a neutral and an extreme op
brakes. to their fullest extent‘as required in emer
gency operation.
The brakes are released by simply moving the
erative position; said valve member havig a re—
cess therein adapted to provide unrestricted com
munication between said atmospheric and cham 75
3
2,188,680
ber Ports when said valve member is in said
neutral position, said valve member having a
restricted groove therein of constant cross sec
tional area adapted to provide communication
between said atmospheric and chamber ports re
spectively when said valve member is moved out
of said neutral position, said valve member also
having a tapered channel arranged so [as to be
out oi! registry with said pressure port ‘when
10 said valve member is in said neutral position and
adapted to provide communication between said
pressure port and said chamber port when said
valve member is in positions intermediate said
neutral and said extreme operative position, said
15 larger recess being arranged to provide unre
stricted communication between said pressure
source port and said chamber port when ‘said
valve member is in said extreme operative posi
tion.
.
4. In an air brake system having a source oi’
pressure and a power chamber therein; a con
trol valve body having three ports therein leading
to said pressure source, said chamber, and the
atmosphere respectively; and a movable valve
member adapted to cooperate with said ports and
valve member-also having a channel therein ta
pered in both width and depth arranged‘ so as to
be out of registry with said pressure port when
said valve member is‘ in the neutral position and
adapted to be brought into registry with said
pressure source port when said'valve member is
in an operative position.
5. In air air brake system having a source of
sub-atmospheric pressure and a power chamber
therein; a control valve body having an opening 10
therein with three ports intersecting said open
ing and connected to said pressure source, said
chamber, and the atmosphere respectively; and f
a plug member rotatable within said opening and , \ ~
having a neutral and a variable operative posi 15
tion, said plug member having a restricted groove
therein of constant cross sectional area adapted
to provide communication between the ports con;
nected with the atmosphere and said chamber
respectively when said plug member is rotated out 20
of said neutral position, said plug member hav
ing a larger recess therein adapted to provide
communication between said atmospheric ‘and
said chamber ports when said plug member is in
the neutral position, said plug member also hav 26
having neutral and operative positions, said valve ing a tapered channel arranged so as to be out
member being arranged to provide communica
of registry with said pressure port when said plug
tion between said atmospheric and chamber ports ~ member is in the neutral position and adapted to
when said valve member is in ‘said neutral posi
provide progressively greater communication be
tion, said valve member having a restricted
groove therein adapted to provide communica
tion between said atmospheric port and said
chamber port respectively when said valve mem
' ber is moved into an operative position, said
tween said pressure source port and said cham 80
ber port the farther said plug member is rotated
from said neutral position.
'
DUDLEY F. SEAFLE.
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