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NOV. 5, 1946.
'E_
ROCKWELL
2,410,750
HIGH~TO-LOW PRES SURE CONVERTER
‘ Original Filed Jan. 4, 1940
2 Sheets-Sheet l‘
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275
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43%
25¢
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ATTOR EY
Nov. 5, 1946'.
2,410,750
E. A. ROCKWELL >
HIGH-TO-L‘OW PRESSURE CONVERTER
Original Filed Jan. 4, i940 #
NAN
2 Sheets-Sheet 2
N.
QSQN
TOR
'
2,4350%
2,410,150
.
mom in LGWFPRESSURE convening
Edward A. Rockwell, Cleveland, Ohio, assignor to
The New Britain Machine ?ompany, New
Britain, Comm, a, corporation of Connecticut
Original eppllcutionl’anuery 4, 1940, Serial No.
312,356, new Putent No. 2,331,800, dated October
12, 1943. Divided and this application Febru
any 17, 1943, Serial No. 476,248., lln Canada
December 30, 1M5
13 Claims.
l
'
(Cl. .60—54.6)
2
My invention relates particularly to an appamodulated high pressure to said brakes for ob
l‘BLtHS designed for controlling the application of
taining the braking force. In this form of my
power for the operation of diiierent parts or ac~
invention I have provided a reserve tank i hav
cessories of automotive vehicles, as, for example,
ing an outlet port 5 leading to a supply pipe 6.
automobiles,'aeroplanes, railroad cars, mine loco- 5 This supply pipe 6 communicates with a spill
motlves, eilcback tank 2% which has a vent pipe 2% leading
This application is a division of my co-pending
up through the tank I beneath the cap 2 thereon. -
application Ser. No. 312,356, died January 4, 1940,
The vent pipe 2st opens from the top of the spill
upon System for controlling the application of
back tank 258. The pipe 6. however, continues
power, Patent No. 2,331,800, granted October 12, i0 inwardly into the latter to communicate with
1943,
t
The objector my invention is to provide asys-
the inlet side of a rotary pump 2% which may be
a gear pump and which is driven by an electric
tem whereby the different parts of automotive
vehicles may be operated in an advantageous
motor 259. This pump 25!) is connected so as to
deliver, by a port, the high pressure liquid to‘ an
manner so as to maintain adequate control over 15 accumulator 253 constructed with the same parts
the slime at 8-11 times- An?ther Object 15 ‘310 DI‘Oas described in connectionlwith the accumulator
vide an apparatus of this character, in accordH, in said Patent No. 2,331,800, and has the same
ance with which the part to be operated maybe
circuit connections to the electric motor as there
moved into position initially by means of a ?uid
described, except that a pressure otabout 1500"
applied at one pressure, and thereafter operated 20‘ lbs. pensquare inch is capable of being supplied
to Cause the Performance Of WOrk by said part by
?uid at another Pressure, this being accom-
thereby. The high pressure liquid thus accumu
\ lated in the accumulator 253 is delivered by a
pllshed, if desired, by various di?erentlals bepipe 2st from a passageway zeta therein having
tWeBn the pressures ?lppliedfor moving said part 1 a. check valve 25%, to a regulator valve 255 for
and the manual or actuating pressures utilized '25 maintaining a, definite pressure, which has 8.
f0? 001130111118 the Pressures 50 applied- My inventlon is adapted to be applied, not only for the
- operation of heavy-duty parts, as, for instance,
on heavy trucks, requiring a, considerable volume
of pressure ?uid for the operation of the same
but also for the Operation of relatively light parts
on aeroplanes and other automotive vehicles,
such, for instance, as light trucks, etc. Still another Object is 130 provide an unloader valveAnother object is to provide a- converter valve.
Further objects of my invention will appear from
the detailed description of the some hereinafter.
While my invention is Capable of embodiment
in many di?erent f?l'ms. I have ShQWn only Oertain embodiments thereof m the accompanying
drawings in Which-f
‘
valve structuresubstaintially the same as in the
valve lt'l in said Patent No. 2,331,800. This reg
ulator valve 255 is connected by a port 265 to the
pipe 256 from which the valve receives thepres
30 sure liquid delivered by the accumulator 253.
The low pressure, or exhaust liquid, leave the
valve 255 by a. pipe 268110 returnto the spill-back
_ tank 2%. In this valve structure the valve I52,
I53 is normally closed by the spring 260a and the
35 valve ass, 568 normally open and the compres-'
sion of the spring ztta. normally maintains the
pressure of the liquid at a. given desired pressure.
When this pressure is exceeded’ the said two
valves open and close, respectively, and the ex
40 must liquid passes out by the valve 852, I53.
~ This construction produces a. regulated pressure
_ Fig. 1 is an’elevation of a form of the system
of approximately 1000 lbs. per square inch, which
involving the manual application of high pres-
is delivered by the said valvev 255 through a port
sure to apply thereby a modulated low and then
a high Pressure;
.
26'? to a pipe 266 which then conveys it to .a, high
45 pressure port 269 of a modulator valve 210, and
Fig- 218 a Plan View Of a detail therevf. with
which is constructed substantially the same as
parts in section on line 2—2 of Fig. 1;
the modulator valve 831 in said Patent No.
_ Fig. 3 is .a. transverse section of a converter
2,331,800 except in this instance inside the spring
from high to low pressure used in Fig. 1; and
In there is a light spring 21 la, to normally keep '
F18‘. 4 is a diagrammatic representation 01’ the 50 the valve I52 open. On the side of said modu
clrcuitinFls. 1'’
lator valve 210 ‘the pipe 268, has a connection
The form of my invention shown in Figs. 1 and
whichconveys the high pressure‘ liquid by a. pipe
2 isdesi‘gned for heavy-duty Operation and may _ 212-110 the high'pressure port 213 of a hand-op
be used, for example, in connection with the operated modulator valve 2'" provided with a. dis
cretion of mine locomotives 'or railway cars. 55 charge pipe 2142 leading to the reserve tank I,
This form of my invention is designed, further- ~ and having a handle #15 to operate the same, all
more, to modulate a. regulated high pressure to
of which is constructed exactly like the said mod
produce a modulated low pressure for bringing
ulator valve I 31. This handle 215 thus enables
the brakes into position preparatory to applying
modulated high pressure to be delivered from
the braking. force and thereafter to apply av 60 a. port 216 thereof by a pipe ill to a delayed-ac
r
2,410,750
'
hand lever 215, but only after the brake shoes
have‘ been moved up into position. Thus‘, aiter
the brakes have been moved up into braking po-
sition by a supply 01 modulated low pressure liq
uid thereto, as hereinafter described, the modu
lated high pressure liquid is discharged by the
modulator valve 218 from a port 218 and thence
by a pipe 288 to a brake operating mechanism
connected to a pipe Joint 28I to thus apply high
4
,sure ?uidreceived from the pipe 288 through
the pipe 281 to the high pressure end of the high
to-low pressure converter 288 so as to thereby
force out of the low pressure side ‘01' the same,
~
through the pipe 289, a low pressure liquid which
passes directly through the modulator valve 218
10 becauserthe valve 152 is kept open at this stage
pressure liquid for the braking ‘effect. While
the modulated high pressureliquid is thus de
livered by the pipe 211 to‘ the hydraulic element
. 218, a portion of this same liquid from thepipe .>
211, for preliminarily moving the brakes into p0~
'sition, passes by a pipe 282 \to a hydraulic .device
288 constructed the same asthe device 218 except ,
that'in this instance a light spring "I is used,
and which in turn operates a modulator valve 284
constructed the same as the modulator “Valves T
previously described, as, for instance, said modu~
,-
288 so as to modulatingly release the high pres
whichoperates the said modulator valve 218 hy- ‘
draulically vaccording to the operation of ‘the
.
by said valve from the pipe 212 is applied through
the pipe 282 to the light spring hydraulic control
tion hydraulic modulator controlling device 218
constructed with a vstrong spring 28I‘ therein
by the strong spring control 218,‘ 28I, this low
pressure liquid being thus delivered by the pipe
' 288 to the brakes to move the brake shoes initially
into position. As the pressure applied increases
in the pipe 211 this brings about no increased
action on the part of the control 288 but acts to
overcome the strong spring-2M in the control
218, thus closing the valve I52 and opening. the
valve I81 in the modulator valve 218, and thus
supplying a modulated high pressure liquid
through the pipe 288 to apply the braking force
on the brake shoes.
In this way any desired
increments of increasing pressure,‘ initially low
and thereafter high pressure, can be‘ applied for
the operation of the brakes. In the oil modula
tion of the valve 218 the liquid flows in the re
verse direction in the pipe 288, and from the mod
lator valve I81. In this instance the high pres
sure liquid to be modulated by the hydraulic ele-,
,ment 288 is received’by 'a pipe ‘288 from the‘ otherv
side of the accumulator 258 and is thus received ' ulator valve 214 back to the reserve tank 'I
through the pipe 214a and from the modulator
in a high pressure port 288 of the modulator valve
284 from which the modulated. pressure liquid 80 valve 284 through the pipe 2881' back to the spill
back tank 248.
'
is delivered by a pipe 281 to the high pressure side
. While I have described my invention above in 2
of a high-tc-low pressure converter 288. This is
detail I wish it to be ‘understood that, many
' comprised of a small cylinder 288a, having‘ a nor
changes may be made therein without departing '“
mally closed air bleeder 2881), in which there is
I
;
a piston 288c with a checkon unloader valve, 35 from the spirit of the same.
288d. v The check valve 288d isin a passageway
1. A pressure transformer comprising a hy
288a leading to a low pressure large cylinder 2188!,
draulic inlet,~a hydraulic-outlet line, a manually‘
having a piston 288a, and provided with an air
'bleeder 2887». An air ?lter 288i is on the cylinder ‘ controlled member comprising a small piston and
288f. The ‘said modulator valve 284 is provided 40 a large piston connected together for forcing
liquid through‘ said outlet line, a supply reservoir
with a discharge or exhaust port 2881 leading
for said member‘ and an unloader valve, seating
back to. the spill-back tank 248. The low pres
in the same direction with the inlet and mounted ‘
sure side of the said low pressure converter 288
is connected by a pipe 288 to a low pressure port‘ ‘ in‘ a passageway extending through said pistons _
288‘ ‘in the modulator valve 218.‘ This low‘ pres 48 to prevent by seating the flow of ?uid from the
inlet through ‘said passageway and adapted to dis—
‘ sure supplied through the port 298, due to the
charge the liquid from said line to said reservoir,
strong spring. 28I keeping the valve I82‘ open in
Iclaim:
the initial operation of the brakes,.permits the
.
,
_
‘
‘
operatively connected to the manually controlled
-member.
,
‘
low pressure ?uid to pass between the valve I82
and its seat and thence to the pipe 288 for the 50 2. A construction, comprising a’ hydraulic line,
_a movable member, having a small piston and
movement of the brake shoes up to tne braking
position. When the pressure in the pipe 288 has , va large piston connected'together, with the large
piston nearer to said line, said member being
been applied to such an'extent as to move the
controllable manually for iorcingliquid there
brake shoes into position, the increase in pres
through, cylinders for said pistons, resilient means
sure within the pipe 211 will seat the valve I52
which moves said member away from said line
in the modulator valve 218 to’ permit the entry
when not being controlled manually, a source of
of'high' pressure liquid by the valve I81, thus
supplying the high pressure liquid through the
pipe 288 to apply the braking effect as previously
described. The exhaust ?ow of liquid from the
‘ modulator valve 218 is received in the pipe 288.
In this way a relatively high pressure may be used
for applying a comparatively low pressure for
the initial seating 01' the brakes, as, for instance,
on mine locomotives or railway cars, .while high
supply of hydraulic liquid for said member, and
a valve to normally‘ cut o?! the liquid from the
source of supply to said‘line and adapted to dis-'
charge the liquid from said line to said source
of supply, operatively connected to the movable
member.
A construction, comprising a hydraulic line,
a movable member controllable manually by sup
plying hydraulic pressure to the member, for
forcing liquid therethrough, a cylinder for the
pressure liquid is applied thereafter to the brakes
to obtain the desired braking force.
movable member, a source of supply of hydraulic
In the form of my invention shown in Figs. 1,
liquid for said member, and a valve, seating in
2, 3 and 4, there is utilized a-relatively highpres
sure which initially brings a relatively low pres 70 the same direction with the manually controlled
hydraulic pressure to normally-cut of! the liquid
sure into action for setting the brakes into posi
from the source of supply to said line and adapted
tion,-after which a modulated high pressure is
‘to discharge the liquid from said line to said
applied for applying the braking force. In this
source of supply, mounted on the movable
instance, when the hand control modulator valve
‘
214 is operated the high pressure liquid received 78 member.
2,410,750
5
6
4. A construction, comprising a hydraulic line,
through, cylinders for said pistons, resilient means
a movable member, having a small piston and
which moves said member away from said line
a large ‘piston connected together, with the large
when not being controlled manually, a source of
piston nearer to said ‘line, said member being
supply of hydraulic liquid for said member, and
controllable manually for forcing liquid there \$1 a valve to normally cut off the liquid from the
through, cylinders for said pistons, resilient
source of supply to said line and adapted to dis
means which moves said member away from said >
line when not being controlled manually, a source
of supply of hydraulicliquid for said member, and
a valve to normally cut oil the liquid from the
source of supply to said line and adapted to dis
charge‘the liquid from said line'to said/source of
supply, mounted on the movable member.
5. A low pressure converter comprising a small
charge the liquid from said line to said ‘source
_ of supply, operatively connected to the movable
member, said pistons having a passageway con
taining said valve passing through both said
_
pistons.
.
',
10; A construction, comprising a hydraulic line,
a movable member controllable manually for
forcing liquid therethrough, a cylinder for. the
cylinder, 9, large cylinder, pistons connected to 15 movable member, a source of supply of hydraulic
gether to form a double piston to operate in said
liquid for said member, and a valve to normally
. cylinders, resilient means which moves the pistons
cut off the liquid from the source of supply to
towards the small cylinder, a liquid supply inlet
'said line and adapted to discharge the liquid
and outlet on the smal1 cylinder at one end of
from ‘said line to said source of supply, mounted
the double piston, a valve movable with said' 20 on the movable member,. said movable member
_ pistons adapted to close in the same direction
comprising small and large pistons with the. large
with said inlet of liquid, and an inlet for liquid
piston nearer to the hydraulic line, resilient
in the large cylinder at the other end of the
means which moves the pistons away from said
double piston, which has a passageway contain
ing said valve passing through both said pistons. ~ line, and an intermediate breather chamber, said
6. A low pressure converter comprising a small
cylinder, a large cylinder, pistons connected to-.
gether to form a double piston adapted to oper
movable member being provided with a com
municating passageway between the same con
. taining said valve,
11. A construction, comprising a hydraulic line,
ate in said cylinders, resilient means which moves >
movable member, having a small piston and
the pistons towards the small ~cylinder, a liquid 30 aa large
piston connected together, with the large
supply inlet and outlet on the small cylinder at
piston nearer to said line, said member being
one end of the double piston, a valve movable
controllable manually for ‘forcing liquid there
with said pistons, adapted to close in the same
through, cylinders for said pistons, resilient
direction with said inlet-of liquid, an inlet for
means which moves said member away from said
liquid in the large cylinder at the other end of 35 line when not being controlled manually, a source
the double piston, and a breather opening in
of supply of hydraulic liquid for said member,
the large cylinder, having an air ?lter communi
and a valve to normally cut off the liquid from
cating therewith, located between the two pistons
the source of supply to said line and adapted to
which have a passageway containing said valve
discharge the liquid from said line to said source
passing through both said pistons.
'
40 of supply, mounted on the movable member, said
7. A pressure transformer comprising a hy- pistons having a passageway containing said
draulic line, a manually controlled member com
valve passing through both said pistons.
prising a small and a large piston connected to
12. A low pressure converter comprising a
gether for forcing liquid therethrough with the
small cylinder, a large cylinder, said converter
large piston nearer to the hydraulic, line, resilient r45 being provided with a breather chamber, pistons
means which moves the pistons away from said
connected together to form a double piston to
line, a breather chamber between the pistons, a
operate in said cylinders, resilient ‘means which
supply reservoir for said member and an un- _
moves the pistons towards the small cylinder, a
loader valve mounted in a passageway extending ~ liquid supply inlet and outlet on the small cyl-_
through said pistons and adapted to discharge the 50 inder at one end of the double piston, a valve,
liquid from said line to said reservoir, operatively
movable with said pistons, adapted to close in
connected to the manually controlled member.
the same direction with said inlet of liquid and >
8. A construction, comprising a hydraulic line,
an inlet for liquid on the large cylinder at the
-a' movable member controllable manually for
other
of the double piston, said double piston
forcing liquid therethrough, a cylinder for the 65 havingend
a passageway containing said valve and
movable member, a source of supply of hydraulic
passing through both said pistons.
liquid for said member, and a valve to normally
cut o? the liquid from the sources of supply to
13.‘ A low pressure'converter comprising a small ‘
cylinder, a large cylinder, said converter being
said line and adapted to discharge the liquid
provided with a breather chamber, pistons con
from said line to said source of supply, oper» , 60 nected together to form a double piston to oper
atively connected to the movable member, said
ate in said cylinders, resilient means which moves
movable member comprising , small ‘and large
the pistons towards the small cylinder, a liquid
pistons with the large piston nearer to the hy
supply inlet and outlet on the small cylinder
draulic line, resilient means which ‘moves the
at one end of the double piston, a valve, movable
pistons away from said line, and an intermediate 65 with said pistons, adapted to close in the same
breather chamber, said movable member being
direction with said inlet of liquid, an inlet for
provided with a communicating passageway‘be
liquid on the large cylinder at the other end
tween the same containing said valve.
'
9. A construction, comprising a hydraulic line, ' '
of the double piston, and a breather opening for
the breather chamber in the large cylinder
a movable member, having a small piston and‘ 70 located between the two pistons, said double
a large piston connected together, with the large
piston having a passageway containing said valve ' i
piston nearer to said line, said member being
and passing through both said pistons.
controllable manually for forcing liquid there
EDWARD A. ROCKWELL.

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