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Патент USA US2410998

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Nov. 12, 1946.
2,410,998
C. N. REAVIS
ELECTRIC SPEED CONTROL AND MOTOR PROTECTOR
Filed Sept. ll, 1943
N
mm.,
3 Sheets-Sheet l
NOV. 12., 1946.
Q_ N, REAVIS
2,410,998
ELECTRIC SPEED CONTROL AND MOTOR PROTECTOR
Filed Sept. l1, 1943
N_MJLN
3 Sheets-Sheet 2
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Inventor
¿Mn/’es /Y. Eeavals
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Nov. 12, 1946.
c. N. REAvls
2,410,998
ELECTRIC SPEED CONTROL AND MOTOR PROTECTOR
Filed Sept. ll, 1943
3 Sheets-Sheet 3
Tat?. 4.
Inventar
¿M366 N. Rees/¿s
2,410,998
Patented Nov. 12, 1946
UNITED STATES PATENT OFFICE
2,410,998
ELECTRIC SPEED CONTROL AND
MCTOR PRGTECTOR
Charles N. Reavis, Raleigh, N. C., assigner of two
thìrds to Silas B. Coley, Raleigh, N. C.
Application September 11, 1943, Serial N0. 502,012
4 Claims. (Cl. ISO-82.1)
1
2
This invention relates to new and useful im
i9 disposed through several guides 20 and abut
provements in control systems for motor vehicles
ments are provided on this pin iQ for operating
a pair of spring contact fingers 2l, 22, the con
tact ringer 2i being alternately operative against
contacts 23,
while the contact ñnger 22 is
operative against a grounding contact 25.
Numeral 2t denotes an ordinary automotive
generator. A conductor extends from the bind
ing post oi the generator to contact 23.
Numeral 2B denotes an ordinary storage bat
and more particularly to a vehicle speed control
and motor protector.
The principal object of the present invention
is to provide an electric system for protecting an
engine from damage when lubricating or cooling
systems fail.
Another important object of the invention is
to control the speed of a vehicle by cutting out
some essential operating parts thereof.
Still another important object oi the invention
tei-y on the motor vehicle and this has a lead
mined speed.
2:9 to the contact 24.
extends
From to
thea Contact
warningiinger
light 3l,
2l, which
a conductor
may have
a light shield 32, and from this warning light
Other objects and advantages of the invention
will become apparent to the reader of the follow
3l, a wire
extends to connect to a wire 34, onev
side of which connects to one side of a lock switch
is to provide a warning signal for a vehicle driver
to warn him as he reaches a certain predeter
ing description.
while the other end connects to a thermo
static water switch
and also to an oil pres
In the drawings:
E9, respectively.
Figure 1 represents a diagrammatic view show 20 sure switch Si by branch wires
As it is to be understood that this particular
ing the electrical connections between the elec
system is used in conjunction with gasoline mo
trical devices that are to be employed when the
tors, a distributor or distributors dèi, M will be
system is utilized in conjunction with gasoline
used and in conjunction with this is employed
engines.
Figure 2 is a diagrammatic view showing the 25 a time delay switch generally referred to by
numeral 42. The switch
consists of a frame
electrical connections between the electrical de
having a slide member Mi therein adapted
vices involved when the system is used. in con
to be urged to t-_e right in Figure 1 by a com
junction with the Diesel motor.
pression spring 45. In the frame ¿i3 is a bi
Figure 3 is a fragmentary vertical sectional
30 metal element ¿Si adapted to be heated by heating
view taken on the line 3-3 of Figure 1.
coil Il? and this has a lug ¿t3 normally engaged
Figure 4 is a section taken on the line 6_4
in a notch t9 of the slide member 44 when
of Figure l.
the system is operatinfT normally.
Figure 5 is a section taken on the line 5-5
The slide member 44 carries a cross member
of Figure 1.
Figure 6 is a section through the governor. 35 5i! on which are contacts opposed to contacts 5i,
52 and these are connected by wires 53, 54 to
Figure 7 is a side eievational View of one of
the feed terminals of distributors Ml, Gil, respec
the governor arms.
tively. Numeral 55 denotes a reset button for
Referring now to Figure 1 wherein like numer
resetting the slide M to the lug in the notched
als designate like parts, it can be seen that
numeral 5 denotes a governor unit which is inter 40 position shown in Figure l. A wire 55 extends
from the conductor 30 to one side oi the heat
posed in the usual drive to a speedometer (not
coil M, while the other side of the heat coil
shown) and this comprises a case t having a
4l is connected to the bi-metal element 46. The
shaft î disposed therein and having suitable con
lai-metal element ¿it is, in turn, connected to the
necting accommodations at the ends S, 9. The
device in no way interferes with the normal 45 opposite side of the switch 35.
It can now be seen, that when the vehicle is
operation of the speedometer.
at a standstill, current for the system is obtained
On the shaft 'l is a slidable sleeve Iii.
Governor arms H, l
provided with weights
have bell-crank arms i3 iulcrumed as at I4 and
from the generator 2li, but when the Vehicle be
gins to move and attains a speed of from 15 to 18
having rollers l5 which are operative against the 50 miles per hour, the governor arms l! of the
lower end of the sleeve I0.
The upper end of the sleeve l0 has a flange l5
and above this flange I6 are a pair of disks
l1, i3 between which are ball bearings or the
like.
speed control unit 5 begin to open which moves
the sleeve lo upward permitting
contact
finger 2i to make Contact with the contact 24
and this serves to transfer the current supply
Rising from the upper disk i'l is a pin 55 from the generator 25 to the battery 2B, so that
2,410,998
4
current will now be available from the battery
28 along the conductor 29 to the unit 5.
When the vehicle has attained a speed which
has been predetermined by the setting of an
minals of the distributors through wires 53 and
54, contacts 5| and 52, members 53 and 44, and
casing 43, thereby stopping the engine.
The
same operation takes place when the vehicle
adjusting screw 53, the contact finger 22 engages
the grounding contact 25 due to a further lifting
travels above 15 to 18 miles per hour, except the
current is derived from battery 28 instead of gen
of the sleeve I3, thus grounding the system and
erator 25 by reason of disengagement of contact
‘2| from contact23 and engagement of the same
same instantfcurrent is passed 4through the heat
with contact 24. The same operation also takes
ing coil 41 and bi-metal element 45 warps up 10 place when the oil pressure in the engine lubri
wardly to disengage the lug 48 from the notch
cating system unduly lowers so as to allow switch
49 with the result that the spring 45 shifts the
31 to close, the current then flowing from wire
slide 44 to the right engaging the contact 55
34 to wire 39 and switch 31 to ground a. Should
with the contacts 5| and 52 to ground distributors
the safety of the vehicle or its operator be
43 and 4| and render the engine inoperative. It 15 jeopardized by stopping the engine, the operator
will here be noted that this forces the driver to
can prevent the device from functioning by open
drive below a predetermined vehicle speed.
ing switch 35 and thereby breaking the circuit
When there is a failure of the cooling system
of the heating coil 41 before element 46 has be
and the temperature rises to say 211° Fahrenheit,
come heated suñîciently to disengage lug 48 from
causing the warning light 3| to energize. At the>
the thermostatic switch 33 acts to ground the _,.
circuit which results in energization cf the warn
member 44. When the contact 22 engages con
tact 25, lamp 3| is lighted because current flows
from battery 23 through wire 23, contacts 24
ing light 3|, and operation of the mechanism
results in stopping of the motor.
and 2|, wire 35, signal lamp 3|, wires 33, 34, 39
When there is a failure of the lubricating Syo
and 33a, contacts 22 and 25, and casing 3 to
tem causing the oil pressure to drop below ñve 25 ground a. At the same time, current flows from
pounds or any predetermined setting, oil pressure ’ wire 33 through wire 53, heating coil 41, element
switch 31 acts to ground the system and this
43, switch 35, wires 34, 39 and 39a, contacts 22
results in energization of the signal light 3i, and
and 25, and casing 3 to ground a so as to close
operation of the mechanism results in the stop
the circuit of coil 41, thereby causing the engine
ping of the motor.
3.0 to be stopped within a short time, due to short
The switch 35 allows the operator to maintain
circuiting of the distributors as described above,
the system in condition for operation of the
.and unless the speed of the Vehicle is properly
vehicle in spite of the fact that the system has
„reduced before such short circuiting occurs.
operated properly. Obviously, the driver could
Thus, inspection will show that the driver has
not afford to have the engine stop on such places , operated switch 35, and he may be required to
as railroad tracks, bridges, etc. For this pur»
explain why he has done so and how` long he
`vpose the switch 35 is employed. This switch
continued to operate the engine after operating
normally is closed, but it is of a type so conu
such switch.
structed that it may be opened by a simple push
The system as shown in Figure 2 is substan
thereon to break the circuit of the heating coil 40 tially the same as that in Figure 1 excepting that
41, even though the signal light continues to " this system shown in Figure 2 is especially adapt~
burn, but it _is preferable that this be a lock type
ed for use in connection with Diesel engines.
switch so that when it is actuated it will remain
An emergency stop solenoid 32 is employed ’in
locked in circuit opening position until unlocked
place of the distributors shown in Figure 1 and
by. the proper person. It is pointed out that the as. CAf a special time delay switch which is generally
battery 23 may be the one ordinarily used for the
referred to by numeral 63 is employed in place
starting, lighting and ignition systems of the
of the swítch42 shown in Figure l.
vehicle.
In Figure 2, the contact ñnger 2| is connected
Assuming that the parts are disposed as shown
`»by wire 33’ to a heat coil 64, the latter, in turn,
in Figure 1 except that switch' 35 is closed, that 50 being connected by wire 35’ to the lock switch
the engine is running at higher than idling speed,
35. When the heat coil'34 heats up to the de
and that the vehicle is at a standstill or travel
sired extent, a bi-metal element 35 rises to en
ling at a speed of less than 15V to 1,8 miles per
gage the Contact on a compensator bi-metal ele?
hour, overheating of the water in the> engine
ment B5, which may be adjusted by a screw 61,
cooling system will cause switch 33 to close the 55 _and this serves to energize the emergency stop
circuit of heating coil 41 and that of signal lamp
'solenoid 32 for throwing the engine out of
3|. VThis causes heating of element 43, warns
operation.
the operator that a condition has arisen which
The emergency stop solenoid is part of stand
will be detrimental to the engine if the latter is
ard equipment on vehiclesl powered by Diesel
allowed to continue to operate and indicates the 60 engines, the same acting, when energized, to
n
fact that theV engine will be rendered inoperative
within a short time. At this time, current flows
from generator 2S through wire 2l', contact 23,
contact 2|, wire 33, lamp 3|, wires 33, 3d and
38, and switch 35 to ground a. Current also
flows from wire 30 through wire 53, coil 41, e1e~
ment 45, switch 35, wires 34 and 33 and switch
38 to ground a. In a short time, element 43 will
be heated suñiciently to cause it to flex so that
cause, through suitable means, stopping of the
engine. This produces the same result as short
circuiting the distributors in embodiment of Fign
ure 1, and it is accordingly thought that the cir
' cuits can be readily traced in Figure 2 in view
of the description thereof in connection with
Figure l.
'
.The reason for obtaining current from the
generator is for purposes of testing, giving the
lug :i3 is disengaged from member 44, thereby 70 engine protection while running` at higher than
permitting spring 45to move member 44 so as
idling speed and the vehicle is standing still, and
to cause contacts 5| and 52 to be bridged by
keeping theV system from going into action when
member 55. The latter operation short circuits
the engine is idling and the vehicle is standing
distributors 43 and 4| by causing the ignition
still or traveling below a predetermined speed.
current to ilow toground a from the feed ter-> 75 There are times when the oil pressure in a hot
2,410,998
5
motor with thin oil and loose bearings will fall
below ñve pounds, but by the same token the
generator is turning too slow to furnish enough
current to make the system operate. When the
6
switch responsive to the speed of travel of the
vehicle for automatically connecting the gener~
ator with said heating coil until the vehicle at
tains a predetermined speed of travel and for
automatically disconnecting said generator from
and connecting the battery to the heating coil
when the vehicle exceeds said predetermined
the generator to the battery as before explained.
speed, and a manually openable lock switch in
It will be seen that if the belt driving the gen
terposed between the heating coil and said second
erator were to break, motor protection and speed
control would still be provided by the switching 10 switch, said loci; switch requiring unlocking to
vehicle attains a moderate speed, the speed con
trol switch transfers the operating current from
of the course of the operating current from the
generator over to the battery. It will further
be noted that the engine will be rendered inopera
tive if the vehicle rolls down hill at an excessive
speed while out of gear and with the engine 15
idling.
permit closing thereof.
3. A protective system for a motor vehicle hav
ing an engine, comprising a generator, a battery,
an electrical engine stopping device including a
time delay switch, said switch including a heat
ing coil and means including a thermo-sensitive
element under the inñuence cf said heating coil
for closing the circuit of said device when said
element is heated by said coil, a second switch
While the foregoing specification sets forth the
invention in speciiic terms, it is to be understood
that numerous changes in the shape, size and
materials may be resorted to without departing 20 ,automatically rendered operative to close the cir
cuit of said heating coil by an undesired operat
from the spirit and scope of the invention as
ing condition of the engine, and a centrifugal
claimed hereinafter.
switch responsive to the speed of travel of the
Having described the invention, what is claimed
vehicle for automatically connecting the gen
as new is:
l. A protective system for a motor vehicle hav 25 erator with said heating coil until the vehicle
attains a predetermined speed of travel and for
ing an engine, comprising a generator, a battery,
automatically disconnecting said generator from
an electrical engine stopping device including a
and
connecting the battery to the heating coil
time delay switch, said switch including a heat
when
the vehicle exceeds said predetermined
ing coil and means including a thermo-sensitive
speed, said centrifugal switch being further oper
element under the influence of said heating coil 30
able to close the circuit of said heating coil when
for closing the circuit of said device when said
the vehicle attains a predetermined excessive
element is heated by said coil, a second switch
speed of travel.
automatically rendered operative to close the cir
4. A protective system for a motor vehicle hav
cuit of said heating coil by an undesired operat
ing an engine provided with a pressure lubricat
35
ing condition of the engine, and a centrifugal
ing system, comprising a generator, a battery,
switch responsive to the speed of travel of the
an electrical engine stopping device including a
vehicle for automatically connecting the gener
time delay switch, said switch including a heat
ator with said heating coil until the vehicle at
ing coil and means including a thermo-sensitive
tains a predetermined speed of travel and for 40 element under the influence of said heating coil
automatically disconnecting said generator from
for closing the circuit of said device when said
and connecting the battery to the heating coil
element is heated by said coil, a second switch
when the vehicle exceeds said predetermined
automatically rendered operative to close the
speed.
circuit of said heating coil when the pressure in
2. A protective system for a motor vehicle hav
the engine lubricating system unduly lowers, and
ing an engine, comprising a generator, a battery,
a centrifugal switch responsive to the speed of
an electrical engine stopping device including a
travel of the vehicle for automatically connect
time delay switch, said switch including a heat
ing the generator with said heating coil until
ing coil and means including a thermo-sensitive
the vehicle attains a predetermined speed of
element under the influence of said heating coil 50 travel and for automatically disconnecting said
for closing the circuit of said device when said
generator from and connecting the battery to the
heating coil when the vehicle exceeds said prede
element isheated by said coil, a second switch
automatically rendered operative to close the
termined speed.
circuit of said heating coil by an undesired oper
CHARLES N. REAVIS.
ating condition of the engine, and a centrifugal 55
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