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Патент USA US2406510

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Aug. 27, 1946.
.
B. R. Pool.
`
2,406,510
AUXILIARY FLUID PRESSURE SYS-TEM
i
Filed* May 13, 1943
INVEN TOR.
BYRON R. POOL*
2,406,510
Patented Aug. 27, 1946
UNITED STATES PATENT
OFFICE '
2,406,510
AUXILIARY FLUID PRESSURE SYSTEM
Byron R. Pool, Evansville, Ind.
Application May 13, 1943, Serial No. 486,908
8 Claims. (Cl. (S0-52)
1
2
It has heretofore been proposed to utilize the
'
.
iliary system in which the foregoing objectives
power of a fluid pressure system to actuate a
are achieved.
work means so as `to eliminate or reduce the
An embodiment of the invention is illustrated
in the single figure of the drawing in connection
manual effort otherwise required of an operator
in actuating the work means.
Thus, for exam
ple, power-operated actuating mechanisms have
been proposed for utilizing the power of the lubri
cating system of an automotive vehicle, equipped
with hydraulic brakes, to actuate the master cyl
inder in applying the brakes. The power-op 10
erated actuating mechanism therein disclosed
comprises: an actuator arranged for extension
from a normal position to any position in a;
working range to effect a corresponding exten
sion of the work means and for retraction from 15
any such extended position to the normal orany
less extended position to permit a corresponding
retraction of the work means; a similarly mov
able lead member arranged, when extended, to
,
with a more or less schematic view of the power
_operated actuating mechanism disclosed in my
aforesaid co-pending application.
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« The present invention is not limited to use` in
connection with the aforesaid power-operated ac
tuating mechanism but may be used in connec
tion with other suitable power-operated actua
tors. vNor is it necessarily limited to use in con
nection with a work means in the form of a hy
draulic brake system. A hydraulic brake vsys
tem is shown in the drawing for illustrative pur
poses and, as shown, includes: a reservoirl; a
master cylinder 2; a master piston 3 having an
extension 3A; and an outlet connection 4 leading
from the master cylinder to the wheel cylinders
connect the pressure side of the iiuid pressure 20 which are not shown.
system to the actuator and thereby extend it
and, when retracted, to connect the drainage
side of the pressure system to the actuator and
thereby permit its retraction; a lag membermov
able with the actuator and arranged, when the 25
My power-operated actuating mechanism, as
illustrated in connection `with the foregoing brake
system, comprises: a work means actuator hav
ing a power cylinder 5 containing a power piston
6 which abuts extension 3A; a lead member ‘l
manually operable throughA link 8, crank 9, shaft t
actuator moves it to a position corresponding to
l0, and handle H to connect the power cylinder
that of the lead member, to disconnect the ac,
5 to the pressure chamber l2 or drainage cham
tuator from either pressure or drainage and there
ber I3 which are respectively connected to the
by lock it in a corresponding position; and means
for retracting the actuator and lead lmember 30 pressure and drainage sides of a iiuid pressure
system; Ia lag member I4 having an opening l5,
when the actuator is connected to drainage.
through which the connection of the power cyl
It is sometimes impossible or undesirable to use
inder 5 to pressure (chamber l2) or drainage
the lubricating system as a source of fluid pres
(chamber I3) is effected, and being movable with
sure. In such cases it is necessary to provide
the actuator piston 6 so that the lag member
an auxiliary pressure system.
.
Y.
»
operates, when' the actuator piston reaches a
The present invention relates to a novel form
position corresponding to that ofA the lead mem
of auxiliary system and has, as one of its principal
ber 1. to lock the piston in such position byy dis
objects, the provision Yof >an auxiliary system
connecting the cylinder from pressure or drain
which operates at no load at all times whenthe
power-,operated actuating mechanism is in its 40 age; and retracting means including a spring
I6 which normally urges the piston 6 towards
normal or off position.
.
its normal or off position and which becomes
Another object of the invention is to provide an
effective to move the piston when the power cyl
auxiliary system inwhich ypower is built up more
inder is connected'to drainage. '
or less instantaneously upon the movement ofthe
power-operated actuating mechanism out of its 45
off position.
`
A further object resides in the provision of an
auxiliary system having a main pump and an
As illustrated, the foregoing parts are inthe
normal or oif position. When handle l l is movedV
leftward, it moves lead member ‘l leftward and
auxiliary pump so arranged that the auxiliary
pump remains idle so long as the main pump
remains operable but becomes automatically
thus connects the power cylinder 5 through lag
opening l5 to pressure l2. This extends power
piston 6 leftward and thus correspondingly ex
tends the master piston 3 to build up the braking
available as a source of pressure upon failure of
pressure.
the main pump.
tended leftward, it correspondingly extends the
-
-
However, as the power piston is ex
` lag member I4 leftward. When lag member I4>
A still further object of the'invention is‘to
provide a simple and relatively inexpensive aux 55 and piston 6 reach positions corresponding to
'
,5
v
connected to 4said pressure andi drainage çsides;
'Switch 4|, lon 'the other hand,4 is arranged tc be
closed by the same mechanism that closes'valve
`ill. vWhen the valve 2l is open, switch 4I Ais open.
In the arrangement illustrated,v when the brak
ing pressure is sufñcient to close >valve 21;, it is .
effective to close 'switch 4l.
. .
=
.
A
andr auxiliary means for controlling said aux'
viliary pump, said means being-'responsive to both
the liquid pressure between the mechanically
ydriven pump andf the check valve for said pump,
and-to the'movement of said manualelement
»
~ relatively toits normal position and being- opera- ,
1,With the foregoing auxiliary- pump arrange
tive upon a failure of such liquid pressure and
ment, when the lhandle Il is moved from itsoiî
upon movement of said manual element out of
position suiiiciently to build up a pressure in
the braking system which is capable of closing 10 its normal- position to place said auxiliary pump
in operation.
’
Y
.
valve 21,»switch 4I -willthen be simultaneously
f- 4. The system of claim 3 Whereinfthe auxiliary
closed. Ifr at this time the` main pump 20 is
_means includes: an electrical circuit for control
not operating, its switch 40 will likewise be closed.
ling the operation of the auxiliary pump, said
The closure of both switches 40 and 4| closes
circuit being normally arranged to prevent-its
the circuit of the coil in coil box 39, causing the
operatiomga control Helement responsive ,to the
master switch 38 to be closed and thereby ener
liquid pressure between the mechanically‘driven
gizing the motor 31. The electrically driven pump
pump and the check valve for such pump and
35 is thus placed in operation, the remainder of
arranged for movement from a normal position
the system operating exactly as described in con
nection with pump 20. It will be understood, of 20 to an auxiliary position upon a failure of such
pump pressure; and another control element con
course, that electrical power, for the electrical
nected to the actuating mechanism for move
end of the system, may be received from any
ment from an inoperative position to an auxiliary
suitable source, such as storage batteries which
position upon movement of said element out of
are not shown.
Having described my invention, I claim:
25 its normal position; said control elements coop
erating in their auxiliary positions to cause said
1. A fluid pressure system for a power-operated
circuit to place said auxiliary. pump in operation.
actuating mechanism having actuating pressure
5. The system of claim 3 wherein the auxiliary
and drainage sides and a manually operable ele
means includes: an electrical circuit for control
ment movable from a normal position through a
range of working positions comprising: a main 30 ling the operation of the auxiliary pump, said
circuit being normally open to prevent its opera
tion; a normally open switch serially arranged
liquid pump having pressure and drainage sides
respectively connected to the actuating pressure
and drainage sides of the actuating mechanism;
means for short-circuiting the flow of pump liq
uid from the pressure side to the drainage side
when the operating element is in its normal po
sition so as to enable the main pump to be op
erated under minimum load conditions at that
time; means for breaking said short circuit when
said element is moved out of its normal position 40
so as to enable the main pump tobuild up an
operating pressure; a normally inoperative aux
iliary pump connected to said pressure and drain
age sides; means conditioning the auxiliary
pump for operation upon a failure of said main
pump; and means connected to the actuating
mechanism and arranged to start and stop the
conditioned auxiliary pump when said element
moves respectively out of and into its normal po
sition.
`
2. The system of claim 1 wherein: the auxiliary
pump is driven by an electrical motor having a
control circuit; the conditioning means, upon a
failure of the main pump, completes the control
circuit up to a start and stop switch; and the
connecting means controls the operation of the
start and stop switch.
3. A fluid pressure system for a power-operated
in said circuit for movement to a closed position
upon a failure of the pressure of the mechanical
ly driven pump; another switch serially arranged
in said circuit and connected to the actuating
mechanism for movement from an open position
when said element is in its normal position to a
closed position when said element is moved out
of its normal position; said switches jointly con
-trolling the opening and closing of said circuit.
6. A fluid pressure system >for a power actu
ated work means comprising: a normally operat
ing main liquid pump having pressure and drain
age sides; a power cylinder having an operating
chamber and a piston movable between fully re
tracted and fully extended positions to actuate
the Work means; a control valve having adjacent
lead and lag members both of which are extend
50 ible and retractable along adjacent paths to any
position within a range corresponding to the
range of piston movement, the lag member con
taining an opening communicating at one end
with said operating chamber and being movable
with the piston, the lead member closing the
other end of said opening when lead and lag
members occupy corresponding positions and also
dividing the interior of said control valve into
pressure and drainage chambers that openly
actuating mechanism having actuating pressure
and drainage sides and a manually operable ele 60 communicate respectively with the pressure and
drainage sides of said pump; means for short
ment movable from a normal position through
circuiting the iiow of liquid from the pressure
a range of working positions comprising: a nor
side to the drainage side when the lead member
mally operating mechanically driven liquid pump
is in its fully retracted position to enable the
having pressure and drainage sides respectively
connected to the actuating pressure and drainage 65 pump to operate under minimum load conditions
at that time; means for breaking said short cir
sides of the actuating mechanism; a check valve
cuit when said lead member is moved out of its
between the pump and its high pressure side; a
fully retracted position so as to causesaid pump
low pressure connection for the iiow of pump
to establish an operating pressure in the pressure
liquid from the pressure to the drainage side; a
valve for opening and closing said connection; 70 chamber of the control valve; a manually oper- »
able element connected to the lead member for
means for holding the valve in its open position
extending it in one direction to any selected point
when said element is in its normal position;
in advance of_ the lag member to connect the lag
means for closing said valve when said element
is moved out of its normal position; a normally
member opening to the pressure chamber 'and
inoperative electrically driven auxiliary pump 75 thereby place the operating cylinder under pres@
22,4%;510
,
¿7
i
rsmfeito @mendê both thefpistonianä thellagfmem
'ber iautomaticailyfro i a‘fposition‘ixeorr'esponding '5to
:the ’Iead' ‘ membe?’s iseleeted. iposition' zwh’ere :the
ïleadLrrrremlu'er closes Stile _îag ëmem'ber opening Lto
.seat-the :cylinder f and itherebyïhold the fpis'tozi “iin
Jsuc'h :corresponding :posi/cion; ïs'a'id element" being
’manually ¿operable Lito lretraot ïthe ¿lead :member A
58
7.' Thezsystem -f of yclaim _f6 iinclu'din-g: a 'rnormal'ly
:inoperative ¿auxiliary ¿pump >¿connectedy ¿to »i‘said
„pressure-.andvlirainage sides; and means :fender
ving y¿the auxiliary ¿pump ¿operative >upon :a ffailure
ifofss ai'd im'ain pump.
8. The system of «claim 6.;ìhc1uding:ra-normallif
vinoperative -auxiliany ‘ípum‘p ïco'rmeciaeiiV to' :said
¿in Lithe yopposite V-Ldire‘et-,ionLto Jaimy isseieet'eä S'p'oi'nt
>pressure «and drainage- sides; :means conditioning
in .advan'oeo'f '.the ¿lag ïmem‘ber ¿to :connect ï-th'e Ilag
fthe li'auxi-Yliary . pump @or operation îupon -alifa‘ilure
member fiopen‘ingtto the :drainage fehamb‘er; :and 10 m'fßsaid »main pump; and :means operative, 'fwhen
means operative,k when the operatingœcylirider-lis
said »element @moves :respectively .i‘owt :of i and liuto
'ïconneeted îíto'lthe ¿drainage `ïch'am'zb'er; ï'itfo Yireis?act
-both ~¿the ïpiston .and ïthe ïiag member ‘ itowarñ 1 ïth'e
A¿its"Ífully‘ma-inf‘ax-ited position, ¿to startsanü s-topïéthe
«oonditionedß'auxiliary pump.
Alead .member’ssseiected ¿position .Where `‘the lea'd
v
.
anemberfagain closesîthejlag¿member-openingiïto
fseal :the xxylind'er and ì’hold Mahe *piston "lin i‘such
inositiom
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. :.TBYRONSR. moon
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