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Патент USA US2118403

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May 24, 1938.
2,1 “18,403
E. E. HEWITT'
COMPRESSOR CONTROL
Filed Sept. 11, 1957
J) .
QINVENTOR
ELLIS E. HEWITT
BY
-
'
»
ATTORNEY
'
2,118,403
Patented May '24, 1938
UNITED ‘STATES PATENT 'OFFICE
2,118,403
COBIPBESSOR CONTROL
Ellis E. Hewitt, Edgewood, Pa., assignor to The
Westinghouse Air Brake Company, Wilmer
ding, Pa, a corporation of Pennsylvania
-Applicaticn September 11, 1937, Serial No. 163,449
20 Claims.‘ (01. 303-4)
This invention relates to a compressor control
system, and particularly to a control system 'for
a motor driven compressor employed on a trac
tion vehicle.
On vehicles equipped with motor driven ?uid
the compressor will be maintained inoperative
responsive to the pressure of the ?uid in the
reservoir into which ?uid is compressed by the
unless the pressure of the ?uid in the reservoir
into which ?uid is compressed by the compressor
is reduced to an abnormally low value.
Another object of the invention is to provide :a 10
compressor.
These governors operate to com
on a reduction in the pressure of vthe ?uid in the
reservoir to a predetermined value, and to inter~
rupt this circuit on an increase on the pressure
of the ?uid in the reservoir to a higher predeter
mined value.
'
v
'
'
During operation of a-compressor some noise
is created. This noise is not noticeable when the
vehicle is in motion as it is obliterated by the
other noises present at that time‘, but the noise
created by operation of a compressor is notice
2O
able and is objectionable when the vehicle is
standing still, at which time no other noise is
created.
'
‘
Accordingly it is desirable that the control sys
2 01
supply ‘of current to the vehicle driving motor, 5
compressors, governors are provided which are
10 plete the circuit to the compressor driving motor
15
mounted on a motor driven vehicle, the control
system being interconnected‘ with the power con
troller for the vehicle driving motor so that when
the power controller is conditioned to out off the
tem for the cdmpressor on' a vehicle be arranged
so that the compressor normally will'be operated
only when the vehicle is in motion. However, if
while the vehicle is idle the'pressure of the ?uid
in the reservoir should be reduced to an abnor
30 mally low value, the supply of ?uid under' p-res-'
sure might be insu?icient to maintain the ‘brakes
on the vehicle applied, or to effect an application
of the brakes if necessary.
7
It is desirable, therefore, that the compressor
control system be arranged to effect operation of
the compressor when the vehicle is not in motion
if the pressure of the ?uid in the reservoir falls
to a value substantially lower than that at which
the control system initiates operation of the com
‘pressor when the vehicle is in motion.
It is an object of this invention, therefore, to
provide an improved compressor control system
which operates in response to variations in the
pressure of the fluid in the reservoir into which
45 ?uid is compressed by a compressor carried ‘by a
vehicle to effect operation of the compressor on
a reduction in .this pressure to a predetermined
value when the vehicle is in motion,v and which
also operates to effect operation of the compres
~0 sor when the vehicle is not in motion only if the
pressure of the ?uid in the reservoir reduces to
a value substantially lower than said predeter
mined value.
A further object of the invention is to provide
55 an improved control system for a compressor
'
compressor control system of the type described '
and incorporating means responsive to current
generated by the vehicle driving ‘motor during
movement of the vehicle subsequent to the‘ inter
ruption of the supply of current to the vehicle '15
driving motor to prevent operation of the com
pressor unless the pressure in the reservoir into
which ?uid is compressed by the compressor is
reduced to a relatively low value.
A further object of the invention is to provide
an improved compressor control system incor- '
porating a pneumatic switch device responsive to
the pressure of the ?uid supplied thereto for controlling the circuit to a compressor driving mo
tor, a valve device for supplying ?uid to said 25
switch device at a predetermined pressure below
'
that present in the reservoir into which?u-id is
compressed by the compressor, and havingv means
responsive to movement of the vehicle for supply
ing ?uid under pressure to said switch device at 39
the full pressure present in the reservoir.
Another object of the invention is to provide an
improved control system for a compressor mount
ed on a vehicle.
>
Other objects of the invention and features of
novelty will be apparent from the following de
scription taken in connection with the accom
panying drawing, the single ?gure of which is a
diagrammatic view, partly in section, of a com
pressor control system embodying this invention.
The equipment shown in the drawing includes
a ?uid compressor I, an electric compressor driv
ing motor 2, a reservoir 3, a brake cylinder 4, a
brake valve device 5, a vehicle driving motor hav
ing an armature l, and a ?eld winding 8, a trolley
ID, a power controller I2, a pneumatic switch
device I 3, valve means M, and a magnet valve
device I5.
The compressor l maybe of any suitable well
known construction and compresses ?uid under
pressure into the reservoir 3 through a pipe l'l,
while the compressor is driven by the electric
driving motor 2 which may be of any suitable
construction.
5
’
The brake valve device 5 may be of any well 55
2
2,118,403
known construction‘ and is connected with the
reservoir 3 by way of a pipe l8 and with the
brake cylinder 4 by way of a pipe 23. The brake
valve device is adapted to control the supply of
?uid under pressure from the reservoir 3 to the
brake cylinder 6, and to also control the release
of ?uid under pressure from the brake cylinder
4 to thereby control the application and release
of the brakes on the vehicle.
10
7
The power controller I2 may be of the well
known construction, and has a handle 22 which
is movable between a power off position and a
plurality of positions in a power on zone to con
trol the supply of current from the trolley ill to
15 the vehicle driving motor.
The power controller i2 has associated there
with a magnetic contactor having a winding 23
and a movable contact 24! which engages either
of two sets of stationary contacts. The movable
contact 24 has biasing means associated there~‘
with and yieldingly pressing the contact into en
gagement with stationary contacts 25, one of
which is connected by way of a wire 25 to one
terminal of the winding, not shown, of the mag
The vehicle driving motor is of a type which,
on continued rotation on the armature ‘1 thereof
occasioned by continued movement of the vehicle
subsequent to the interruption of the supply of
current by the power controller 52, generates a
counter E. M. F.
The pneumatic switch device l3 may be of any
suitable well known construction, and one form
of switch device which may be employed is shown
in application Serial No. 79,937 of Burton S. Aik 10
man, ?led May 15, 1936. The switch device 53 has
a movable abutment in the form of a ?exible
diaphragm 42 which is responsive to the pressure
of the ?uid in a control chamber 44, and which
actuates mechanism, not shown, for operating a
switch controlling the ?ow of current from the
wire 45, which is connected to a suitable source of
current, such as the trolley IE, to a wire 46 which
is connected to one terminal of the compressor
driving motor 2, the other terminal of which is -
connected to ground.
The mechanism actuated by the diaphragm 42
is arranged so that on a reduction in the pressure
of the ?uid in the control chamber 44 to a pre
25 net valve device !5, while the other stationary’ determined value, the circuit to the compressor '-1
contact 25 is connected by way of a wire 28 with ' driving motor will be established. This mecha
a wire 30 which leads from the power controller
nism is also arranged so that this circuit will be
l2 to one of the brushes of the armature 1 of the maintained until the pressure of the ?uid in the
vehicle driving motor.
The other terminal of the
30 winding of the magnet valve device i5 is con~
nected by way of a wire 3| with the wire 32 which
leads from the other of the brushes of the arma
ture ‘I to one terminal of the motor ?eld winding
8, while the other terminal of the ?eld winding 8
is connected to ground.
When the winding 23 of the magnetic contactor
associated with the power controller I2 is ener
gized, the movable contact M is moved against
the biasing means associated therewith out of
engagement with the stationary contacts 25 and
into engagement with the stationary contacts 34,
one of which is connected by way of a wire 35
control chamber 44 has increased to a higher pre
determined value, whereupon the circuit will be :
interrupted and will remain interrupted until the
pressure of the ?uid in the control chamber is
reduced to the ?rst mentioned predetermined
value.
'
.
The valve means I4 is provided to control the
supply of ?uid under pressure to and the release
of ?uid under pressure from the control chamber
44 of the switch device l3 to normally maintain
the pressure of the ?uid in the control chamber
44 at a predetermined value less than that pres
ent in the reservoir 3.
As shown the valve means i4 comprises a mov
with the trolley l0, while the other of the station
able abutment in the form of a ?exible diaphragm
ary contacts 34 is connected by way of a wire 36
50 which is clamped between confronting ?anges
45 to a contact, not shown, mounted within the body
of the power controller i2. The handle 22 of the
power controller it has associated therewith a
movable contact, not shown, which when the
handle 22 is in any of its power on positions en
gages a contact to which is connected a branch
50
of the wire 35 to establish a circuit between the
wire 35 and the wire 38 which is connected to one
terminal of the winding 23, the other terminal
of which is connected to ground. Inpthe power
55 oiT position of the handle 22, the circuit between
the wires 35 and 38 is interrupted.
Similarly, in the power off position of the han
on a cover 5| and a body 52.
The ?exible dia
phragm 570 has at one face thereof a chamber 54
which is constantly connected by way of a branch
of the pipe l8 with the reservoir 3, while the dia~
phragm 50 has at the other face thereof a cham
ber 55 which is constantly connected by way of a .
pipe 53 with the control chamber 45 of the switch
device l3.
The diaphragm 50 has secured centrally there
of a valve seat memberti? which is guided by a
bore in the cover 5i and by a bore in a tubular
projection 5'! formed on the body 52 and extend
dle 22 of the power controller i2, no circuit is
established between the wire 30 leading to the
armature ‘l of the vehicle driving motor and the
wire 36 leading from the contact M. In the power
on positions of the handle 22 a circuit is estab
lished between the wire 36 and the wire 33
ing into ‘the chamber 55. A coil spring 59 is
mounted in the chamber 55 and extends between
the seat member 58 and the body 52 and yield
ingly urges the seat member 53 and the diaphragm 60
50 upwardly, as viewed in the drawing, while up
ward movement of the seat member and of the
diaphragm is limited by engagement of a nut 60
through suitable resistance,
with a surface (it formed on the cover 5!.
not shown, the
65 amount of the resistance being varied in the usual
manner in accordance with the position in the
power on zone to which the handle 22 is moved.
A circuit is provided between the wire 33, which
is connected to one of the brushes of the arma
ture 1 of the vehicle driving motor, and the wire
26 leading to the winding of the magnet valve
device I5. This circuit includes current limiting
resistance 40 for limiting the amount of current
which may be supplied from the wire 39 to the
75 winding of the magnet valve device 15.
Downward movement of the diaphragm 50 and 65
the seat member 58 is limited by engagement of
the seat member with the end of the projection
51, and the various parts of the valve means it
are arranged so that on movement of the seat
member 58 into engagement with the end of the 70
tubular projecting portion 51, the lower end of
the seat member 58 will not close off communi
cation between the chamber within the tubular
portion 51 and the chamber 55 through the ports
63.
75
3
2,118,403
The seat member 58 has a central bore extend~
ing therethrough in which is mounted .a valve
element 65 having a ?uted stem and having a
seating face 66 formed thereon and adapted to
Ll engage a seat formed on the seat member 58
surrounding the passage in which the valve ele
ment 65 is mounted. A coil spring 611 is mounted
in the chamber 54 and extends between the valve
element 65 and the cover 5| and yieldingly presses
the valve 85 downwardly so that the seating face
68 thereon engages the seat on the seat member
58.
'
The valve element 65 also has a seating face
68 formed thereon which is adapted to engage
15 a seat surrounding a passage formed in the body
52 ‘and communicating with the atmosphere by
way of passages 69. The valve element 65 has a
reduced ?uted end portion which extends through
the passage in the body 52 and guides the lower
end of the valve element 65.
The portion of the body 52 surrounding the
passage in which the end of the valve element
65 is mounted has a seating face indicated at
18 formed thereon and- adapted to be engaged by
a seating face indicated at ‘H on a plunger 13
which is mounted in a bore in the body 52. The
head of the plunger 13 is engaged by one face
of a ?exible diaphragm 15 which is clamped be
tween the body 52 and a cover 18. The diaphragm
has at the face thereof a chamber 18 which is
open to the atmosphere through a passage 79.
The diaphragm ‘l5 has at the other face thereof
a chamber 80 which is connected by way of a
pipe 8| with a chamber 82 in the magnet valve
35 device IS.
The plunger l8 is adapted on the supply of
?uid under pressure to the chamber 38 to be
moved upwardly, as viewed in the drawing, and
to engage the end of the stem of the valve ele
ment 65 before the seating face ‘H thereon en
gages the seating face 18 formed on the body
52. On further movement of the plunger '53, the
seating face 68 on the valveelement 65 is moved
away from the seating face formed on the body
52, while the seating face ‘H on the plunger 7;!
is moved into engagement with the seating face
10 formed on the body 52.
-
The magnet valve device I5 may be of any
suitable construction and as shown has a body
having a chamber 82 therein in which is mount
ed a double seating valve element 85, which is
adapted to seat upon a seat surrounding a pas
sage open to a chamber 88 which is constantly
connected by way of ‘a branch of the pipe G8 with
the reservoir 3. The double seating valve ele
ment 85 is also adapted to seat upon a seat sur
rounding a passage open to a chamber 88 which
is constantly connected to the atmosphere by way
of the passage 89.
'
A coil spring 98 is mounted in the chamber
86 and yieldingly presses the double seating valve
element 85 to its upper seated position to cut off
communication between the chamber 82 and the
atmospheric chamber 88, and to permit the supply
of fluid under pressure from the chamber 85
65
to the chamber 82. On energization of the wind
ing, not shown, of the magnet valve device 15,
the double seating valve element 85 is moved
to the lower seated position, as shown in the
70 drawing, to cut off communication between the
chamber 86 and the chamber 82, and to estab
lish communication between the chamber 82 and
the chamber 88.
The equipment is shown in the drawing in the
position which it assumes when the handle 22
of the power controller I2. is in one of its power
on positions, at which time a circuit is estab
lished between a branch of the wire 35 leading
from the trolley l8, and the wire 38 leading to
the winding of the magnetic contactor associated Cl
with the power controller.
As a result of energization of the winding. 23,
the movable contact 28 is held in the upper posi
tion as shown in the drawing, thereby establish
ing a circuit between the stationary contacts 10
34, thus establishing a circuit between the Wire
35 and the wire 36 so that current is supplied
from the wire 38 to the wire 38 through the re
sistanoe incorporated in the power controller‘ l2,
the amount of which depends upon the position
of the handle 22. As a result of the supply of
current to the wire 38, current flows to the ar
mature ? and the winding 8 of the vehicle driv
ing motor and causes the motor to drive the
vehicle.
,
Current supplied to the Wire 3!) flows through
the wire 23 to one of the contacts 25, ‘out as the
movable contact 24 is in its upper positionv no
circuit is established between the stationary con—
tacts 25, and current cannot ?ow from the wire
38 through the contacts 25 to the wire 28 leading
to the winding of the magnet valve device i5.
Current supplied to the wire 38 flows there
from‘ through the current limiting resistance 48
and the Wire 26 to one terminal of the Winding 30
of the magnet valve device l5, and from the other
terminal of this winding through the wire 3| to
the wire 82, which connects a brush of the arma
ture ‘l with the ?eld Winding 8, and thence
through the ?eld winding 8 to ground, thereby
energizing the winding of the magnet valve de
vice l5.
iii
~
As a result of energization of the winding of
the magnet valve device !5, the double seating
valve element 85 is held in its lower seated posi- ,.
tion against the spring 98, thereby preventing
communication between the chamber 86 and the
chamber 82 andconnecting the chamber 82 to
the atmospheric chamber 88.
The switch device i3 is shown in the drawing ,
in the position to complete the circuit to the
compressor driving motor 2, while the various
parts of the valve means M are shown in the
position which they assume when ?uid under
pressure is present in the reservoir 3 at a pres- ,
sure above a low value.
As the circuit to the compressor driving mo
tor 2 is completed, the motor will drive the com
pressor and the compressor will compress ?uid
into the reservoir 3 and increase the pressure
of the ?uid present therein. On the increase in
the pressure of the ?uid in the reservoir 3 there
is a similar increase in the pressure of the ?uid
in the chamber 54 of the valve means 54, and a
corresponding increase in the force exerted on 60
the diaphragm 58, and the diaphragm and the
seat member 58 are moved downwardly against
the opposing pressures of the ?uid present in the
chamber 55 and of the spring 59, thereby mov
ing the seat on the seat member 58 away from
the seating face 85 on the valve element 65 to
permit ?uid under pressure to ?ow from the
chamber Eli to the chamber 55, and to the control
chamber ‘M- of the switch device It to increase
the pressure of the fluid in the chambers 44 and 70
55.
On an increase in the pressure of the ?uid in
the chamber 55 there is an increase in-the force
exerted on the diaphragm 58 in opposition to
the force exerted by the ?uid in the chamber 54. 75
4
2,118,408
When the pressure of the ?uid in the chamber 55
increases to a predetermined value below that
present in the chamber 541, the force exerted
:1
by the ?uid in the chamber 55, assisted by the
55 has been reduced by ?ow therefrom through
the passages 69 to a predetermined value below
the valve element E5 to cut o? the further supply
of ?uid under pressure from the chamber 54 to
the chamber 55 and to the control chamber 414'.
of the switch device l3.
It will be seen, therefore, that the valve means
l4 operates during an increase in the pressure
of the ?uid in the reservoir 3 to supply ?uid un
der pressure from the reservoir 3 to the control
chamber fit of the switch device iii to maintain
the pressure of the ?uid therein at a predeter
mined value below that present in the reservoir
3, and that this pressure differential is deter
mined by the spring 59.
When the pressure of the ?uid in the reservoir
3 and in the chamber 5d of the valve means M
1. {A
has increased to a predetermined relatively high
value, the valve means it will be operated to sup
ply ?uid under pressure to the chamber 55 and
to the control chamber at of the switch device
is to increase the pressure of the ?uid present
therein to a value high enough to e?ect move
ment of the diaphragm 42 of the switch device
53 to actuate the mechanism associated there
with to interrupt the circuit leading to the driv~
ing motor 2 for the compressor l, thereby inter
ii rupting operation of the compressor 1.
On a subsequent reduction in the pressure of
the ?uid in the reservoir 3, which may be occa
sioned by the use of fluid under pressure from
the reservoir 3 by the brake valve device 5 in ap
40 plying the brakes, there is a similar reduction in
the pressure of the ?uid in the chamber 54 of the
valve means Hi. On the reduction in the pres
sure of the ?uid in the chamber 54, there is a
corresponding reduction in the force exerted upon
45 the diaphragm 59, and the ?uid under pressure in
the chamber 55, assisted by the spring 59, moves
the diaphragm 5i} and the seat member 58 up
wardly, as viewed in the drawing,while the seat
on the seat member 53 presses against the seat
50 ing face 615 on the valve element 65 so that the
valve element 65 is moved against the spring 61
with the result that the seating face 68 on the
valve element 65 is moved away from the seat on
the body 52.
55
.
When the pressure of the ?uid in the chamber
spring 59, overcomes the opposing force of the
?uid in the chamber 54, and the diaphragm 56
and the seat member 58 are moved upwardly,
as viewed in the drawing, so that the seat on the
seat member 58 engages the seating face 56 on
10
under pressure from the chamber 55 through the
passages 69.
On movement of the seating face 68 of the
valve element "55 away from the seat on the body
52, ?uid under pressure is released from the
chamber 55 of the valve means M and from the
control chamber 441 of the switch device l3 to the
60 atmosphere through the passages 59, thereby re
ducing the pressure of the ?uid present in the
chambers lid and 55.5.
On this reduction in the pressure of the ?uid
in the chamber 55, there is a corresponding re~
duction in the force exerted by this ?uid upon
the diaphragm. 5!], and the higher pressure of the
?uid in the chamber 54 at the opposite face of
the diaphragm moves the diaphragm 5G and the
seat member 58 downwardly against the oppos
ing force of the fluid in the chamber 55 and of
the spring 59, while the spring 6? maintains the
seating face 66 on the valve element 65 in en
gagement with the seat on the seat member 58,
and also moves the valve element 65 towards the
N in seat on the body 52 to cut off the release of ?uid
that present in the chamber 54, the diaphragm
5B and the seat member 58 will be moved down
wardly against the opposing force of the ?uid in
the chamber 55, and of the spring 59, far enough
to permit the spring 5'! to move seating face 10
68 on the valve element 65 into engagement with
the seat on'the body 52 to thereby cut on" the
further release of ?uid under pressure from the
chamber 55.
'
It will be seen, therefore, that on a reduction 15
in the pressure of the ?uid in a reservoir 3, the
valve means It operates to release ?uid under
pressure from the chamber 55 and from the con
trol chamber '34 of the switch device l3 to main
tain the pressure of the ?uid therein at a prede
termined value below that present in the reser
voir 3, and that this pressure differential is de
termined by the value of the spring 59.
On the reduction in the pressure of the ?uid
in the control chamber d4 of the switch device l3 25
there is a corresponding reduction in the force
exerted on the diaphragm. e2, but the mechanism
actuated by the diaphragm d2 is arranged so that
when it is conditioned to interrupt the circuit to
the driving motor 2 of the compressor I, it will ,
not be operated to establish this circuit until the
pressure of the ?uid in the control chamber 44 is
reduced to a value substantially below that which
is required to effect operation of the switch de
vice to interrupt the circuit to the compressor
driving motor.
~
Accordingly, on a reduction in the pressure of
the fluid in the control chamber 54, the switch
device It will operate to maintain the circuit to
the compressor driving motor interrupted until
the pressure of the ?uid in the control chamber 40
is reduced to a predetermined value, whereupon
the diaphragm 42 will be moved against the 0p
posing force of the ?uid in the control chamber
44, and the mechanism actuated by the dia
phragm 4S2 will operate to establish the circuit to
the compressor driving motor 2, and the com
pressor i will then be operated to supply ?uid
under pressure to the reservoir 3 to increase the
pressure of the ?uid therein.
On the increase in the pressure of the ?uid in ‘
the reservoir 3, the valve means M operates as de
scribed in detail above to supply ?uid under pres~
sure to the control chamber 46 of the switch de—
vice 15 to maintain the pressure of the ?uid
therein at a predetermined value below that pres
ent in the reservoir 3, while upon an increase in
the pressure of the ?uid in the reservoir 3 to a
predetermined relatively high value, the pres
sure of the ?uid in the control chamber 44 will
be increased to a value high enough to e?'ect 60
operation of the switch device It to again inter
rupt the circuit to the driving motor 2 for the
compressor l.
The spring 59 which determines the differential
maintained by the valve means M between the
?uid in the reservoir 3 and the chambers 55 and
44 is proportioned so that this differential is equal
to that which it is desired to maintain between
the pressures at, which operation of the com
pressor is initiated when the vehicle is in motion
and when the vehicle is not in motion.
Thus if when the vehicle is in motion, it is de
sired to initiate operation of thercompressor on a
reduction in the pressure of the ?uid in the res 75
5
2,118,403
ervoir 3 to one hundred pounds, and when the
vehicle is not in motion to maintain the com
pressor inoperative until the pressure of the ?uid
in the reservoir is reduced to ninety pounds, the
spring 59 will be proportioned to prevent move
ment of the diaphragm 50 by the ?uid in the
chamber 54 until the pressure of the ?uid there
in is increased to a value of ten pounds above that
present in the chamber 55.
The compressor control system provided by
10
maintain the pressure of the ?uid in the cham
ber 55 and in the control chamber 44 of the
switch device H1 at a predetermined value below
that present in the reservoir 3.
When the vehicle is not in motion, the arma
ture T of the vehicle driving motor is not rotated
and no current or counter E. M. F. is generated
thereby, and hence current is not supplied to the
be operated to supply ?uid under pressure to the
reservoir 3 until the pressure of the ?uid in the
winding of the magnet valve device l5. On de
energization of the winding of the magnet Valve
device I5, the double seating valve element 85 is
moved by the spring 50 from the lower seated
position to the upper seated position, thereby cut
ting off communication between the chamber 82
'15 reservoir is reduced to a somewhat lower value
ting communication from the chamber 86 to the
this invention is arranged so that when the ve
hicle is not in motion, the compressor 1 will not
than that at which operation of the compressor
‘ is initiated when the vehicle is in motion, and so
that operation of the compressor is cut off when
the pressure of the ?uid in the reservoir is in
20 creased to a somewhat lower value than the pres
sure at which operation of the compressor is cut
off when the vehicle is in motion.
When movement of the vehicle is to be stopped,
the handle 22 of the power controller !2 is turned
25 from a position in the power on zone to the power
off position, and on this movement of the handle
22, the movable contact, not shown, operated by
the handle 22 interrupts the circuit from the
branch of the wire 35 to the wire 38 leading to
one terminal of the winding 23 of the magnetic
contactor associated with the power controller
l2. In addition, on this movement of the handle
22, the circuit from the wire 35 leading from the
stationary contact 34 to the wire 35 is interrupted.
On the interruption of the circuit through the
:35
Winding 23 of the contactor associated with the
power controller l2, the winding 23 ceases to ex
ert force to maintain the movable contact 24 in
engagement with the stationary contacts 34, and
40 the movable contactv 24 is moved by the biasing
means associated therewith into engagement with
the stationary contacts 25, thereby completing a
circuit from the wire, 30 to the Wire 26 leading
to the winding of the magnet valve device I5.
This completes a circuit from the vehicle driv
ing motor through the winding of the magnet
valve device l5 which shunts the current limit
ing resistance 45.
After movement of the handle 22 of the power
controller 12 from the position in the power on
zone to the power off position, movement of the
vehicle will continue for a time interval, and the
armature ‘l of the vehicle driving motor will be
rotated. As a result of rotation of the armature
l’ a counter E. M. F. or current will be gener
ated and will ?ow through the winding of the
magnet valve device l5 by way of a circuit which
includes the wire 30 and the wire 28, the movable
contact 24, the wire 26, and the wire 31. As long
60 as the vehicle continues to move at any substan
tial speed, the current generated by the vehicle
driving motor will be sui?cient to energize the
winding of the magnet valve device 15 and cause
the double seating valve element 85 to be held in
65 its lower seated position against the spring 90.
Accordingly, as long as the vehicle is in motion
with the handle 22 of the power‘ controller l2
either in one of its power on positions or in the
power off position, the double seating valve ele
ment 85 of the magnet valve device [5 will be held
in its lower seated position, while the chamber
80 at the face of the diaphragm "l5 of the valve
means l4 will be connected to the atmosphere.
As a result, therefore, the valve means l4 will
75 operate as long as the vehicle is .in motion to
and the atmospheric chamber 88, and permit
chamber 82.
10
15
I
On movement of the double seating valve ele
ment 85 to the upper seatedposition, ?uid under
pressure supplied from the reservoir 3 ?ows to 20
the chamber 32 and thence by way of the pipe
8! to- the chamber 819 at the face of the dia
phragm 15 of the valve means I4.
As a result of
the supply of ?uid under pressure to the chamber
85 force is exerted upon the diaphragm ‘l5 and .25
moves the stem ‘l3 upwardly so that the end ‘of
this stem engages and presses against the end of
the valve element 65, thereby moving this valve
element against the spring 61, while the seating
face 66 on the valve element 65 is moved away
from the seat on the seat member 58 to thereby
open communication between the chamber 54
and the chamber 55. In addition, on this
movement of the valve element 65, the seating
face v58 thereon is moved away from the seat .35
formed on the body 52. However, the release of
?uid under pressure from the chamber 55 to the
atmosphere is prevented because on upward
movement of the plunger '13, the seating face ‘H
thereon seats upon the seating face 10 on the :40
body 52 and cuts off the ?ow of ‘?uid from the
chamber 55.
.
On movement of the seating face 66 on the
valve element 55 away from the seat on the seat
member 58, ?uid under pressure flows from the
reservoir 3 and the chamber 54 to the chamber
55, and thence to the control chamber!“ of the
switch device l3 and increases the pressure of
the ?uid in these chambers. On an increase of
the pressure of the ?uid in the chamber 55 there
is a corresponding increase in the force exerted ‘
upon the diaphragm 50, and the diaphragm and
the seat member 58 are moved upwardly against
the opposing force of the ?uid in the chamber 54.
On this upward movement of the seat member 355
55, the seating face thereon is moved towards the ‘
seating face 56 on the valve element 65.
The various parts of the valve means I 4‘ are ar
ranged and proportioned, however, so that fur
ther upward movement of the seat member 58 is 60
prevented by engagement of the nut 60 with the
surface '6! on the cover section 5! before the
seat on the seat member 58 engages the seating
face '56 on the valve element 65 when the valve
element 65 is in the position in. which it is held
by the plunger 73 when the surface 11 on the‘
plunger 13 is in engagement with the seating
face ‘it formed on the body 52.
Accordingly ?uid under pressure from the res
ervoir 5 and the chamber 54 ?ows past the seat 70
ing face 55 on the valve element 65 to the cham
ber 55, and to the control chamber 44 of the
switch device l3 to increase the pressure of the
?uid in the chambers 44 and 55 to the full pres
sure present in the reservoir 3.
6
2,118,405
As the switch device I3 is subject at this time
to the full pressure of the ?uid. in the reservoir
3, instead of to a pressure a predetermined value
below that present in the reservoir, the switch de
vice l3 will operate to prevent operation of the
compressor l until the pressure of the ?uid in
the reservoir 3 is reduced to a lower value than
that at which operation of the compressor is in
itiated when the vehicle is in motion.
_Similarly, the switch device it’ will operate to
cut oiT operation of the compressor I when the
On energization of the winding of the magnet
valve device I5, the double seating valve element
85 is moved from its upper seated position to its
lower seated position, thereby cutting off the sup
ply of ?uid under pressure from the reservoir 3
and the chamber 86 to the chamber 82 and estab
lishing communication between the chamber 82
and the atmospheric chamber 88. Upon move
ment of the double seating valve element 85 to
the lower seated position, therefore, ?uid under 10
pressure is released from the chamber 85 at the
pressure of the ?uid in the reservoir 8 is in
creased to a lower value than that at which op
face of the diaphragm 75 of the valve means M.
On the reduction in the pressure of the ?uid
in the chamber 80 there is a corresponding reduc
tion in the force exerted on the diaphragm 75 15
and on the plunger 13. 'When the pressure of the
?uid in the chamber 80 is reduced to a relatively
eration of the compressor is cut off when the
15 vehicle is in motion.
Thus if the spring 58 is proportioned to main
tain a pressure differential of ten pounds be
tween the pressure of the ?uid in the chambers
54 and 55, and if the switch device i3 is adjusted
20 to initiate operation of the compressor l on a
reduction in the pressure of the ?uid in the vcon-
trol chamber 44 to ninety pounds, the switch de
vice will operate when the vehicle is in motion to
initiate operation of the compressor upon a re- '
25 duction in the pressure in the ?uid of the res
ervoir 3 to one hundred pounds, because, as
low value, the spring 51 operating through the
valve element 65 moves the plunger it down
wardly so that the seating face ‘H on the plunger 20
73 is moved away from the seating face ‘if! on
the body 52.
On this movement of the plunger 13 the spring
67 moves the valve element 85 relative to the
seat member 58, which at this time is held by 25
the ?uid under pressure in the chamber 55 in
pointed out above, when the vehicle is in motion,
the position determined by engagement of the
the valve means I4 operates to maintain the
pressure of the ?uid in the control chamber M
nut 60 with the surface 6! on the cover 5i. On
this movement of the valve element 65 by the
30 ten pounds below that present in the reservoir 3.
However, when the Vehicle is not in motion, the
switch device l3, being then supplied with ?uid
under pressure at the full pressure carried in the
reservoir 3, will operate to initiate operation of
spring 6?, the seating face 58 on the valve ele 30
ment 65 is moved towards the seating face formed
on the body 52, while theseating face 65 on the
valve element 65 is moved into engagement with
the seating face formed on the seat member 58.
35 the compressor I only after a reduction in the
The various parts of the valve means M are
pressure in the ?uid in the reservoir 3 to ninety
arranged and proportioned so that when the seat
member 58 is in the position determined by en
gagement of the nut 50 with the surface 6!, the
pounds.
,
Likewise, the switch device l3 will operate when
the vehicle is not in motion to cut oif operation
40 of the compressor 1 when the pressure of the ?uid
in the reservoir 3 has built up to a lower value
than is effective to cause operation of the switch
device l3 to cut oif operation of the compressor
1 when the vehicle is in motion.
On a subsequent movement of the handle 22
45
of the power controller l2 from the power off
position to a position in the power on zone, the
movable contact controlled by the handle 22 es
tablishes a circuit between a branch of the wire
50 35 and the wire 38 leading to the winding 23 of
the contactor associated with the power control
ler !2. On energization of the winding 23, the
movable contact 24 is moved out of engagement
with the stationary contacts 25, thereby inter
55 rupting the circuit through which current was
supplied from the vehicle driving motor to the
winding of the magnet valve device i5. On this
movement of the movable contact 215 it is moved
into engagement with the stationary contacts 34,
60 thereby establishing a circuit from the wire 35
leading from the trolley ill to the wire 35, while
seating face 65 on the valve element 55 will be
moved into engagement with the seating face on 40
the seat member 58 to thereby cut off the ?ow
of ?uid under pressure from the chamber 54 to
the chamber 55 before the seating face 58 on
the Valve element 65 is moved into engagement
with the seating face formed on the body 52 to 45
cut off the release of ?uid under pressure from
the chamber 55.
Accordingly, upon movement of the plunger 13
occasioned by the release of ?uid under pressure
from the chamber 80, the valve element 55 will 50
be moved to a position to cut off the supply of
?uid under pressure to the chamber 55, but to
permit the release of ?uid under pressure from
the chamber 55 through the passages 55.
As a result of the release of ?uid under pres
sure from the chamber 55 through the passages
69 there is a reduction in the pressure of the
?uid in the chamber 55 and in the control cham~
ber 44 of the switch device it, and a correspond
ing reduction in the force exerted by the ?uid 60
under pressure in the chamber 55 upon the dia
on movement of the handle 22 of thepower con
phragm 55.
troller l2 to a position in the power on zone a
On a reduction in the pressure of the ?uid in
the chamber 55 to a predetermined value below
circuit is established between the wire 35 and
65 the wire 30 leading to one of the brushes of the
armature 1 of the vehicle driving motor, and the
vehicle driving motor is operated to effect move
ment of the vehicle.
On the supply of current to the wire 30, current
70 ?ows therefrom through the current limiting re
sistance 4!] to the wire 35, through the winding
of the magnet valve device l5, and thence by
way of the wire 3i and the ?eld winding 8 to
ground, thereby energizing the winding of the
magnet valve device [5.
that present in the chamber 555, the force exerted
by the ?uid in the chamber 55 and by the spring
59 on the diaphragm 55 is insu?lcient to main~
tain the diaphragm 5!) and the seat member 53
against the opposing force of the ?uid in the
chamber 54, and the diaphragm 5t and the seat 70
member 58 are thereupon moved downwardly, as
viewed in the drawing, against the opposing force
of the ?uid in the chamber 55 assisted by the
spring 59.
On this downward movement of the diaphragm 75
2,118,403
“and the seat member 58, the valve element 65
is moved with the seat member 58 by the spring
61 with the result that the seating face 65 on the
valve element 65 is held in engagement with the
seat on the seat member 58, while the seating
face 68 on the valve element 65 is moved towards
its seat on the body 52. When the pressure of
the ?uid in the chamber 55 is reduced to a prede
‘ ‘termined value below that present in the cham
her 54, the diaphragm 50 and the seat member
58 will be moved far enough by the ?uid in the
chamber 54 to cause the seating face 68 on the
valve element 65 to engage the seat on the body
52 to cut off the further release of ?uid under
pressure from the chamber 65 and from the con
"20
"25
'30
v40
45
trol chamber 44 of the switch device l3, and the
valve means M will operate thereafter to main
tain the pressure of the ?uid in the chamber 55
and in the control chamber 44 at a predeter
mined value below that present in the reservoir
'3, while the switch device It will operate as
described above in response to variations in the
pressure of the ?uid in the control chamber 44 to
complete or interrupt the circuit to the driving
motor 2 vfor the compressor I.
From the foregoing it will be seen that the
compressor control system provided by this in
vention incorporates a pressure responsive switch
device for controlling the circuit to the com
pressor driving motor, and that valve means is
provided for normally maintaining the pressure
of the ?uid supplied to the switch device at a
predetermined value below that present in the
reservoir into which ?uid is compressed by the
compressor.
It will be seen also that the control system
incorporates means controlled by the power con~
troller for the vehicle driving motor for supplying
?uid under pressure to the switch device at the
full pressure present in the reservoir when the
vehicle is not in motion to thereby eiTect opera
tion of the switch device to maintain the circuit
to the compressor driving motor interrupted
when the vehicle is not in motion until the pres
sure of the ?uid in the reservoir is reduced to
a somewhat lower value than that at which oper
ation of the compressor is initiated when the
vehicle is in motion.
While one embodiment of the improved com
pressor control system provided by this invention
50 has been illustrated and described in detail, it
should be understood that the invention is not
limited to these details of construction, and that
numerous changes and modi?cations may be
made
Without departing from the scope of the
55
following claims.
Having now described my invention, what I
claim as new and desire to secure by Letters
Patent, is:
1. In combination, a ?uid compressor carried
by a vehicle, an electric motor for driving said
compressor, switch means responsive to a pre
determined increase in ?uid pressure in a con
trol chamber vfor opening the circuit of said
65 motor and to a predetermined decrease in the
pressure of ?uid in said chamber for closing the
circuit, a valve device operative to supply ?uid
under pressure to said chamber at a predeter
mined degree less. than the pressure of ?uid com
70 pressed by the compressor, and means opera
tive upon stopping of the vehicle for supplying
?uid at the pressure of ?uid compressed by said
compressor to said chamber.
'
2. In combination, a ?uid compressor carried
by a ‘vehicle, said vehicle having a driving mo
tor operative on continued movement of the ve
hicle subsequent to the interruption of the sup
ply of current thereto to generate a counter
E. M. F., an electric motor for driving said com
pressor, switch means responsive to a predeter Cir
mined increase in the pressure of the ?uid in
a control chamber for opening the circuit of
the compressor driving motor and to a prede
termined decrease in the pressure of the ?uid
in said chamber for closing said circuit, valve 10
means operative to supply ?uid under pressure
to said chamber at a predetermined degree less
than the pressure of the ?uid compressed by
the compressor, and means controlled by the
counter E. M. F. generated by the vehicle driv
ing motorand operative upon a predetermined
reduction in said counter E. M. F. for supplying
?uid to said chamber at the pressure of the
?uid compressed by the compressor.
3. The combination with a vehicle having a
driving motor and a power controller for said
motor, said power controller having power on
and power o? positions, a ?uid compressor car
ried by said vehicle, a driving motor for said
compressor, a reservoir into which ?uid is com- I
pressed by said compressor, switch means re
sponsive to the pressure of the ?uid in a control
chamber for controlling the circuit to the com
pressor driving motor, a valve controlling the
supply and release of ?uid under pressure to and
from said control chamber, a movable abutment
subject to the pressure of the ?uid in said res
ervoir for controlling said valve, and means con
trolled by said power controller for also con
trolling said valve.
35
‘
4. The combination with a vehicle having a
driving motor and a power controller for said
motor, said power controller having power “on
and power off positions, a ?uid compressor car
ried by said vehicle, a driving motor for said
compressor, a reservoir into which ?uid is com
pressed by said compressor, switch means re
sponsive to the pressure of the ?uid in a con
trol chamber for controlling the circuit to the
compressor driving motor, a movable abutment
subject to the opposing pressures of the ?uid
in the reservoir and of the ?uid in said control
chamber, a valve operated by said
controlling the supply and release
pressure to and from said control
means. controlled by said power
also operating said valve.
abutment and
of ?uid under
chamber, and
controller for
'
5. The combination with a vehicle having a
driving motor and a power controller for said
motor, said power controller having power on 555
and power off positions, a ?uid compressor car
ried by said vehicle, a driving motor for said
compressor, a reservoir into which ?uid is com
pressed by said compressor, switch means re
sponsive to the pressure of the ?uid in a control
chamber for controlling the circuit to the com
pressor driving motor, a movable abutment sub
ject to the opposing pressures of the ?uid in
said reservoirand of the ?uid in said control
chamber for controlling the supply of ?uid under 65
pressure to said control chamber and for also
controlling a release passage through which ?uid
under pressure may be released from said con
trol chamber, and means controlled by said power
controller for supplying ?uid under pressure to 70
said control chamber and for cutting off com
munication ‘through said release passage.
6. The combination with a vehicle having a
driving motor and a power controller therefore,
said'power controller having power on and power
8
2,118,403
’ oif positions, a ?uid compressor carried by said
vehicle, a driving motor for said compressor, a
reservoir into which ?uid is compressed by said
compressor, switch means responsive to the pres
sure of the ?uid in a control chamber for con
trolling the circuit to the compressor driving
motor, valve means responsive to the opposing
pressures of the ?uid in said reservoir and of
the ?uid in said control chamber for supplying
10 ?uid under pressure to and for releasing ?uid
under pressure from. said control chamber to
maintain the pressure of the ?uid in said con
trol chamber at a predetermined value below
that present in the reservoir, and means con
trolled by said power controller for supplying
?uid under pressure to said control chamber at
the pressure present in the reservoir and for
cutting off the release of ?uid from said control
chamber by said valve means.
‘7. The combination with a vehicle, a ?uid com
20
pressor carried by said vehicle, a driving motor
for said compressor, a reservoir into which ?uid
is compressed by said compressor, switch means
responsive to the pressure of the ?uid in a con
25 trol chamber for controlling the circuit to the
compressor driving motor, valve means respon
sive to the opposing pressures of the ?uid in said
reservoir and of the ?uid in said control cham
ber for supplying ?uid under pressure to and for
30 releasing ?uid under pressure from said con
trol chamber to maintain the pressure of the
?uid in said control chamber at a predetermined
value below that present in the reservoir, and
means responsive to movement of the vehicle
35 for supplying ?uid under pressure to said con
trol chamber at the pressure present in the res
ervoir and for cutting off the release of ?uid
from said control chamber by said valve means.
8. The combination with a vehicle having a
40 driving motor and a power controller therefore,
said power controller having power on and power
oiT positions, a ?uid compressor carried by said
vehicle, a driving motor for said compressor, a
reservoir into which ?uid is compressed by said
45 compressor, switch means responsive to the pres
sure of the ?uid in a control chamber for con
trolling the circuit to the compressor driving
motor, valve means responsive to the opposing
pressures of the ?uid in said reservoir and of
50 the ?uid in said control chamber for supplying
?uid under pressure to and for releasing fluid
under pressure from said control chamber to
maintain the pressure of the ?uid in said control
chamber at a predetermined value below that
55 present in the reservoir, and means controlled
by said power controller for conditioning said
valve means to supply ?uid under pressure to
said control chamber at the full pressure present
in the reservoir and for cutting off the release
60 of ?uid from said control chamber by said valve
means.
9. The combination with a vehicle, a ?uid com
pressor carried by said vehicle, a, driving motor
for said compressor, switch means responsive to
65 the pressure of the ?uid in a control chamber
for controlling the circuit to the compressor driv
ing motor, valve means responsive to the oppos
ing pressures of the ?uid in said reservoir and of
the ?uid in said control chamber for supplying
70 ?uid under pressure to and for releasing fluid
under pressure from said control chamber to
maintain the pressure of the ?uid in said control
chamber at a predetermined value below that
present in the reservoir, and means responsive
76 to movement of the vehicle for conditioning said
valve means to supply ?uid under pressure at the
full pressure present in the reservoir and for
cutting off the release of ?uid from said control
chamber by said valve means.
10. In a control system for a ?uid compressor
mounted on a vehicle, in combination, a ?uid
compressor, a reservoir into which ?uid is com
pressed by said compressor, an electric driving
motor for driving the compressor, switch means
responsive to the pressure of the ?uid in a con
trol chamber for controlling the supply of cur
rent to said compressor driving motor, a valve
controlling the supply and release of ?uid under
pressure to and from said control chamber, a
movable abutment subject to the pressure of the
fluid in said reservoir for actuating said valve,
an abutment subject to the pressure of the ?uid
in an operating chamber for also controlling said
valve, a driving motor for the vehicle, a power
controller for controlling the supply of current
to said vehicle driving motor, and means con
trolled by said power controller for controlling
the supply of ?uid under pressure to said operat
ing chamber.
'
11. The combination with a vehicle having a
driving‘ motor and a power controller for said
motor, said power controller having power on and
power oiT positions, a ?uid compressor carried by
said vehicle, a driving motor for said compressor,
a reservoir into which ?uid is compressed by said
30
compressor, switch means responsive to the pres
sure of the ?uid in a control chamber for con—
trolling the circuit to- the compressor driving
motor, a valve controlling the supply and release
of ?uid under pressure to and from said control 35
chamber, a spring, a movable abutment subject
to the opposing. pressures of said spring and of
the ?uid in said reservoir for controlling said
valve, and means controlled by said power con
troller for also controlling said valve.
40
12. The combination with a vehicle having a "
driving motor and a power controller for said
motor, said power controller having power on
and power off positions, a ?uid compressor car
ried by said vehicle, a driving motor for said com- I
pressor, a reservoir into which ?uid is compressed
by said compressor, switch means responsive to
the pressure of the ?uid in a control chamber for
controlling the circuit to the compressor driving
motor, a movable abutment responsive to the 50
pressure or" the ?uid in said reservoir, a valve mov- '
able with said abutment for releasing ?uid under
pressure from said control chamber and movable
relative to said abutment for supplying ?uid under
pressure to said control chamber, and means con 55
trolled by said power controller for moving said "
valve relative to said abutment.
13. The combination with a vehicle having a
driving motor and a power controller for said
motor, said power controller having power on and 60
power off positions, a ?uid compressor carried by '
said vehicle, a driving motor for said compressor,
a reservoirrinto which ?uid is compressed by
said compressor, switch means responsive to the
pressure of the ?uid in a control chamber for 65
controlling the circuit to the compressor driving
motor, a movable abutment responsive to the
pressure of the ?lnd in said reservoir, a valve op
erated by said abutment and controlling a sup
ply passage through which ?uid under pressure 70
may be supplied to said control chamber and also “
controlling a release passage through which ?uid
under pressure may be released from said control
chamber, and means controlled by said power
controller for controlling the release passage and
.15
- 2,118,403
for operating said valve to open said supply pas
sage.
-
1
14. The combination with a vehicle having a
drivingmotor operative on the supply of current
thereto to propel the vehicle, said motor being
also operative to generate a current on movement
of the vehicle while the supply of current there
to is cut off, a ?uid compressor mounted on said
vehicle, a driving motor for said compressor, a
reservoir into which ?uid under pressure is com
pressed by said compressor, switch means respon
sive to the pressure of the ?uid in a control cham
ber for controlling the supply of current to said
compressor driving motor, valve means responsive
15 to the pressure of the ?uid ‘in said reservoir for
supplying and releasing ?uid under pressure to
and from said control chamber, and means op
erative on the supply of current to the vehicle
driving motor and on the generation of a current
by said motor for controlling said valve means.
15. The combination with a vehicle having a
driving motor operative on the supply of current
thereto to propel the vehicle, said motor being
also operative to generate a current on movement
25 of the vehicle while the supply of current thereto
is cut oii, a ?uid compressor mounted on said ve
hicle, a driving motor for said compressor, a reser
voir into which ?uid under pressure is com
pressed by said compressor, switch means respon
30 sive to the pressure of the ?uid in a control cham
her for controlling the supply of current to said
compressor driving motor, valve means responsive
to the pressure of the ?uid in said reservoir for
supplying and releasing ?uid under pressure to
35 and from said control chamber, and means op
erative on the supply of current to the vehicle
driving motor and on the generation of a cur
rent by said motor for supplying ?uid under pres
'sure from said reservoir to said control chamber.
16. The combination with a vehicle having a
40
driving motor operative on the supply of current
thereto to propel the vehicle, said motor being also
operative to generate a current on movement of
the vehicle while the supply of current thereto is
45 out off, a ?uid compressor mounted on said ve
hicle, a driving motor for said compressor, a
50
55
60
65
reservoir into which ?uid under pressure is com
pressed by said compressor, switch means respon
sive to the pressure of the ?uid in a control cham
ber for controlling the supply of current to said
compressor driving motor, valve means respon
sive to the pressure of the ?uid in said reservoir
for supplying and releasing ?uid under pressure
to and from said control chamber, and means op
erative on the supply of current to the vehicle
driving motor and on the generation of a current
by said motor for supplying ?uid under pressure
from said reservoir to said control chamber, and
for also cutting oiT the release of ?uid from said
control chamber by said valve means.
17. The combination with a vehicle having a
driving motor operative on the supply of cur
rent thereto to propel the vehicle, said motor be
ing also operative to generate a current on move
ment of the vehicle while the supply of current
thereto is out o?, a ?uid compressor mounted
on said vehicle, a driving motor for said com
pressor, a reservoir into which ?uidunder pres- .
sure is compressed by said compressor, switch
70 means responsive to the pressure of the ?uid in
a control chamber for controlling the supply of
current to said compressor driving motor, valve
means responsive to the opposing pressures of
the ?uid in said control chamber and of the
75 ?uid in said reservoir for supplying ?uid under
9
pressure to said control chamber and for con
trolling a release passage through which ?uid
under pressure may be released from said control
chamber, and means operative on a supply of cur
rent to said vehicle driving motor and on the -
generation of a current by said motor to supply
?uid under pressure from said reservoir to said
control chamber and to cut oif communication
through said release passage.
18. The combination with a vehicle having a 10
driving motor operative on the supply of cur
rent thereto to propel the vehicle, said motor be
ing also operative to generate a current on move
ment of the vehicle while the supply of current
thereto is cut o?", a ?uid compressor mounted
on said vehicle, a driving motor for said com
pressor, a reservoir into which ?uid under pres
sure is compressed by said compressor, switch
means responsive to the pressure of the ?uid
in a control chamber for controlling the supply 20
of current to said compressor driving motor,
valve means responsive to the opposing pressures
of the ?uid in the reservoir and of the ?uid in
the control chamber and operative to supply ?uid
from the reservoir to the control chamber and
to release ?uid from the control chamber through
a release passage to maintain the pressure of
the ?uid in the control chamber at a predeter
mined value below that present in the reservoir,
and means responsive to the supply of current to 30
the vehicle driving motor and to the generation
of a current by said motor for supplying ?uid
from said reservoir to said control chamber and
for cutting off communication through said re
lease passage.
19. The combination with a vehicle having a
driving motor operative on the supply of current
thereto to propel the vehicle, said motor being
also operative to generate a current on movement
of the vehicle while the supply of current there 40
to is cut off, a power controller for controlling
the supply of current to the driving motor, said
power controller having power on and power o?
positions, a ?uid compressor mounted on said ve
hicle, a driving motor for said compressor, a con
trol device for controlling the circuit to the com
pressor driving motor, and means operative when
the power controller is in the power on position
or when the motor is generating a current to ef
45,
fect operation of the control device to establish 50
the circuit to the compressor driving motor on
a reduction on the pressure of the ?uid in said
reservoir to a predetermined value, said means
being operative when the power controller is in
the power off position and the motor is not gen 55
erating a current to effect operation of the con
trol device to complete the circuit to the com
pressor driving motor only on a reduction in the
pressure of the ?uid in said reservoir to a value
less than said predetermined value.
60
20. The combination with a vehicle having a
driving motor operative on the supply of current
thereto to propel the vehicle, said motor being
also operative to generate a current on movement
of the vehicle while the supply of current there 65
to is cut o?, a power controller for controlling the
supply of current to said motor, a ?uid com
pressor mounted on said vehicle, a driving motor
for said compressor, a reservoir into which ?uid
under pressure is compressed by said compressor, 70
switch means responsive to the pressure of the
?uid in a control chamber for controlling the
supply of current to said compressor driving mo
tor, valve means responsive to the opposing pres
sures of the ?uidlin the reservoir and of the ?uid 75
10
2,118,403
in the control chamber and operative to supply
fluid from the reservoir to the control chamber
and to release fluid from the control chamber
through a release passage to maintain the pres
controller and responsive to current generated
by said vehicle driving motor for supplying ?uid
sure of the fluid in the control chamber at a
lease passage.
predetermined value below that present in the
reservoir, and means controlled by said power
from said reservoir to said control chamber and
for cutting off communication through said re
ELLIS E. HEWITT.
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