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Патент USA US2134053

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-Oct. 25‘, 1938.
Filed May 11, 1955
‘ I'
Patented Oct. 25, 1938
Alfred Aubyn Linsell, Sydcnham, London, Eng
land, assignor to Radio Corporation of Ameri
ca, a corporation of
Application May 11, 1935, Serial No. 20,900
In Great Britain June 2'7, 1934
1 Claim.
(01. 123—-179)
This invention relates to ignition systems for
internal combustion engines and more particu
larly to ignition systems of the kind incorporating
one or more series resistances in the sparking plug
'5 lead or leads for reducing or eliminating inter
ference which would otherwise be caused by the
ignition system with nearby radio apparatus.
As is well known radio receiving apparatus is
likely to be subjected to considerable interference
if situated too near the ignition system of an
internal combustion engine and this difficulty
becomes very serious in some cases, notably where
radio receivers are ?tted to motor cars or upon
The invention is illustrated in the accompany
There are many known expedients whereby
interference by an internal combustion engine
ignition system with nearby radio apparatus may
carrying out this invention, there is provided a
systems, resort is made to the use of “suppressor”
the leads to the sparking plugs, there being usu
ally a resistance placed in series in each lead and
as near as possible to each plug.
It has been
found that known systems of this kind have the
disadvantage that the series resistances, if of
suilicient value to be eifective, tend to make the
internal combustion engine di?icult to start, and
the object of the present invention is to obviate
this di?lculty.
According to this invention in its broadest as
pect, an ignition system of the kind wherein in
terference with nearby radio apparatus is reduced
or eliminated by means including one or more
“suppressor” resistances is characterized by the
provision of means for short circuiting said re
sistance or resistances so that when the engine
is to be started up the said resistance or resist
ances may be short circuited, but when the engine
is running the short circuit or circuits may be
, 4.0
e. g. on one or both sides of the ignition dis
ing diagrammatic drawing.
20 resistances, for example, resistances in series in
tion systems embodying “suppressor” resistances
in series in ignition leads and adjacent sparking
plugs. It is to be understood, however, that the
application of the invention is not limited to
such ignition system for it may be applied to
short circuit (when starting) suppressor resist
ances placed elsewhere in an ignition system‘ 10
be reduced or eliminated and in a number of
simultaneous operation with an electric starter.
The invention- will now be particularly de
scribed with reference to- its application to igni
suppressor resistance 3 and thermostat switch
unit in connection with each spark plug I. The
resistance which is diagrammatically represented
by a zigzag line is carried upon a former or car 20
rier C which has a terminal T at one end and is
adapted at the other to ?t over a sparking plug
stem, the terminal being connected to the upper
end of the resistance and the sparking plug
terminal 20 being connected by lead C to the
other end of the resistance.
Also connected as
by lead 2| to the end of the resistance adjacent
T and also carried by the former or carrier is a
contact 4 adapted to co-operate with another
contact 5 carried upon a bi-metallic strip 2 which 30
is arranged parallel to the said former C and. is
of about the same length. The bi-metallic strip
(like the former or carrier 0) is provided at the
end remote from the contacts with an aperture
adapted to be passed over the stem of a spark
plug, the Whole arrangement being such that the
resistance and bi-metallic strip unit may be
clamped in position upon the sparking plug stem,
as shown, by the ordinary screw terminal 22
In one preferred class of~arrangement in ac
cordance with this invention the short circuit
ing means is or are automatically operated so
that the short circuit or circuits is or are re
moved automatically when the engine is run
Referring to Figure 1 which shows one way of .
In another preferred class of arrangement in
accordance with this invention, said short cir
cuit means is or are interlocked with a device
'50 which is operated for starting the engine so that
performing of an operation necessary for start
ing the engine is accompanied by a short circuit
ing of the resistance or resistances.
Fig. 1 shows the invention as applied to a plug,
55 Figs. 2 and 3 show the invention adapted for
The ignition or high tension lead 23 is con
nected, not to the sparking plug terminal but to
the terminal T.
The bi-metallic strip is so constructed that at
normal atmospheric temperatures the two con
tacts 4, 5, touch and the resistance is accord
ingly short circuited. When, however, the engine
has been running a suf?cient time the rise in
temperature will cause the bi-metallic strip 2
to bend, the contacts .4, 5, will open and the short
circuit across the resistance 3 will be removed.
In another way of carrying out this invention
illustrated in Fig, 2 switches each having con
tacts adapted to short circuit a resistance 3 in
series in the ignition lead to a plug of an internal 55
relay circuit for controlling the energization of
sented at SC. Alternatively the operating rod or
wire ‘I may be arranged to be actuated by a bi
metallic or other thermostatic device which may
be specially provided for the purpose, the device
being arranged to hold the resistances short cir
the starting motor of the engine. The arrange
ment is such that whenever the circuit of the
starting motor is closed or whenever a relay cir
cuit for the starting motor is closed, the switches
are operated to short circuit the resistances, the
operated by engine heat so that it removes the
short circuits when the engine is warm. Where
an embodiment of this kind is applied to an auto
mobile which is already equipped with a thermo 10
’ combustion engine, are arranged to be operated
electro-magnetically by electro-magnets EM
either as shown by current ?owing through a
starting motor SM for the engine or through a
short circuits being, of course, automatically re
moved when the starting motor or the control
circuit therefor is opened. In Fig, '2 which illus
trates the case where the starter motor current
15 operates the switches the starter button is shown
as the usual spring biassed button ll‘ having
starting contacts SC and the starter battery is
marked P. Only one of the suppressor resist
ances and the associated short circuiting switches
20 is illustrated in Fig. 2 only the magnets EM
of the others being shown and the‘ operating
members SW of the switches. The switches and
resistances may, however, be arranged much as
shown in Fig. 3 (to be described) in which case
the members SW of Fig. 2 might be the same as
the members S of Fig. 3.
In a modi?cation of the last described arrange
ment (also not illustrated) instead of employ
ing electroinagnetically operated switch means,
30 there is employed mechanically operated switch
means mechanically interlocked with the starter
switch or button.
Where, the usual case, there is a plurality of
sparking plugs each with its own series resistance,
it is convenient to arrange for these resistances
to be short circuited by a common control mem
ber. For example as shown in Fig. 3 each re
sistance 3 may be arranged upon a former or
carrier C which also carries a contact 4 and is
40 associated with a ?at metal spring S having a
co-operating contact 5 the arrangement ‘of the
former C, resistance 3, spring S, and contacts
4, 5, being generally similar to the arrangement
of former C, resistance 3, bi-metallic strip 2,
r and contacts 4, 5, in Fig. l and such that when
contacts 4, 5, are closed against the bias of the
associated spring S the appropriate resistance
3 is short circuited by the said metal spring. The
former-resistance-spring units have terminals T
for connection of ignition leads and are arranged
to be ?tted over and clamped upon the sparking
plug stems much as in Fig. 1. Preferably the
arrangement is as shown in Fig. 3 so that the
springs S project vertically upwards from the
plugs l. The springs S are continued beyond the
contacts 4, 5, and formers C and have apertures
or slots through which pass a control wire or rod
‘I this control wire or rod passing successively
through all the springs of all the units and being
60 arranged when pulled in the direction of the
cuited so long as the engine is cold but to be
static device for operating louvres or ventilators
in connection with the cooling water system of
the engine or for operating a ba?ie valve in con
nection with said cooling water the same thermo
static device may be employed for operating the 15
short circuiting switch or switches. Again in
a further modi?cation (not illustrated) the con
trol rod or wire is operated by an electro-magnet
energized either under the control of a “ther
mometer switch” (i. e., a temperature operated 20
switch) associated with thecooling water of the
engine, or in dependence upon current ?owing
through the starter motor or a relay circuit there
for so that when the motor circuit or the relay
circuit therefor is energized the resistances are
short circuited but are in circuit at other times.
Instead of employing an electro-magnet to con
trol the short circuits mechanically by means of
an operating rod or wire, the control may be elec
trical i, e., the operating rod or wire may be 30
dispensed with and each spring adapted to serve
as the armature of a separate operating electro
magnet, all these operating electro-magnets hav
ing their windings in series with a source of po
tential P and the contacts of an electro-magnetic
switch whose energization may be controlled in
any of the ways just described in connection
with an electro-magnet for actuating an oper
ating rod or wire .
An important practical advantage of the in
be achieved, because, of course, the difficulty that
‘large resistances interfere with the starting up 45
of the engine is obviated by the said invention.
Having now particularly described and ascer
tained the nature of my invention and in what
manner the same is to be performed, what I
claim as novel and desire to secure by Letters Pat
ent is:
In an electric ignition system for an engine
provided with a starting switch and having a plu
rality of spark plugs, the combination of a re
sistor connected electrically in series with and 55
extending upwardly from the top of each of said
plugs, a conducting spring member connected to
the lower end of each of said resistors and nor
mally disengaged from the upper end, a hori~
zontally disposed slide rod connected to the upper 60
arrow to cause each spring S to short circuit
ends of said conducting spring members, each
portion of the slide rod that is connected to the
is controlled by a master lever 9 which may be in
terlocked with or even constituted by a starter
switch (usually a spring biassed press button, and
shown as such at H in Fig. 2) so that when
70 the starter switch is operated the resistances 3
are short circuited. As shown the lever 9 is pivot
ed at Ill and the starter switch contacts are repre
its associated resistance 3. The operating rod or
wire ‘I should, of course, include insulating por
tions 8 so that it cannot short circuit one spark
65 ing plug to another. The operating rod or wire 1
vention is that it enables large resistances to be
'used for radio interference suppression and there
fore enables e?icient interference suppression to
spring member being electrically insulated from
the other such portionsof the slide rod, and me
chanical linkage between the starting switch and 65
the slide rod whereby upon actuation of the
starting switch the slide rod is moved to urge
the normally disengagedends of the conducting ‘
members into contact relation with the associ
ated ends of the resistors whereby said resistors 70
are momentarily short circuited.
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