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Патент USA US2136206

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Nov. s; 1938. '
2,136,206 I
Filed May 15, 1957
f6‘: W
f'?arrzas DuXeZaw;
Patented Nov. 8, 1938
2,136,206 "
‘Thomas Dukelow, Chicago, 111.
Application May 13, 1937, Serial N0. 142,333
2 Claims.
My invention relates to spark plugs for inter
nal combustion engines and the like. _
An object of my invention is to provide‘a
simple, practical, economical and e?icient device
of the character described.
Another object is to provide a spark plug hav
ing greatly improved operating characteristics
in which is provided two gaps for the sparking
Other objects and advantages will appear and
be brought out more fully from the followingv
speci?cation, reference being had to the accom
panying drawing wherein:
my invention;
_ Fig.‘ 1 is a side view of a spark plug embodying
' '
Fig. 2 is a similar view partly in central sec
that‘the electrode 39 is located in the usual spark
gap which is between electrode l6 and electrode
The operation of the invention is believed to
be obvious. The provision of the intermediate 5
electrode 39 which is seen to be insulated both
from the shell and the electrode 2| and in the
normal spark. gap of the device it will be seen
that two gaps are at once provided for the spark
and the resultingloperation is such that a much 10
more e?icient or hotter spark is provided. Fur
thermore, upon the failure of either gap to func
tion the remaining gap is certain to become op
era'tive and thus the life is greatly extended and
its e?iciency materially improved.
While I have illustrated and described the pre
ferred form of construction for carrying my in
Fig. 3 is a bottom view of the same; and
vention into effect, this is capable of variation,
Figs. 4 and 5 are respectively views in section and modi?cation without departing from the
20 of the inner insulator and electrode.
I spirit'of the invention. I, therefore, do not wish
Referring more particularly to the drawing, I
to be limited to the precise details of construc
show a spark plug ll) of the conventional type tion set forth, but desire to avail myself of such
having a metallic shell ll. provided with a cylin
variations and modi?cations as come Within the
drical bore I2, a reduced bore l3, the'bores l2 scope of the appended claims.
and I3 being merged in a shoulder H, the bore
Having thus described my invention, what I
I! having alower ‘edge portion IS in which is claim as new and desire to secure by Letters Pat
provided the usual terminal stud IS. The shell ent is:
i I is further provided with an internally threaded
1. A device of the character described com
portion l1_ and an externally threaded portion prising a' metallic shell having an electrode in a
l8. The‘ plug is provided with the usual por
side portion thereof, a central electrode insulated
celain dielectric l9 having an internal bore 20 from said shell and adapted to be connected to
for the iniulated electrode 2| and is further pro
a source of potential and forming a spark gap
vided with a cylindrical portion 22 adapted to with said ?rst electrode, a single auxiliary elec
?t into bore l2 and has the vusual tip protecting ‘trode of uniform small diameter positioned en
tirely in said spark gap in spaced relation to said
35 extension 23 beyond which extends the tip 24
of the electrode 2!. A shoulder 25 is formed on ?rst and second electrodes, and a mounting for
dielectric l9 and is adapted to provide a seat i said auxiliary electrode insulated from said ?rst
for a gasket 26 held ‘in place by bushing 21.
The‘ electrode 2| has the usual terminal bolt 28,
> 40 and a bushing 29 made of any suitable insulating
material is located in bore l3 andhas an in
ternal bore illyan enlarged bore 3|, a shoulder
92, an abutment surface 33 and an‘outer cylin
drical portion 34 from which construction it will
45 be apparent that the'bu'shing 29 is retained in
the shell II by the downward pressure of the
cylindrical portion ‘22 of the dielectric l9 against
the ring 33, the shoulder ll of shell ll} serving
to position the bushing 29 in place. A metallic
0 bushing 35 having an internal bore 39 adapted
to receiveextcnsion 23 is provided with a shoul
der 31 and has an outer cylindrical surface 38
adapted to ?t into bore 39 of bushing 29. Bush
ing 35 is provided with an electrode 39 which
55 is positioned between the electrode l6 and tip
24 of electrode 2| and it will thus be apparent
and second electrodes, said mounting including
a bushing within, said shell.
2. A device of the character described com- 40
prising a metallic cylindrical shell having an elec-
trode extending radially inwardly adjacent the
cylindrical end thereof, a dielectric having a cen
tral bore and a cylindrical exterior .portion
adapted to ?t within said shell, an electrode in 45
said dielectric having an end portion‘ adjacent
said ?rst mentioned electrode, and a metallic
cylindrical bushing in said shell and insulated
therefrom and provided with a single auxiliary
electrode of uniform small diameter having its 50
end portion terminating between said ?rst and
second electrodes, said shell bushing and dielec
tric having correlated shoulders adapted for in
ter?tting attachment.
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