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Патент USA US2106449

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Jan. 25, 1938.,
¢_ R‘BOYD
2,106,449
SPARK PLUG
Original Filed Sept. 12, 1954
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Patented Jan. 25, 1938
2,106,449 '
UNITED STATES PATENT OFFICE-p‘, r
2,106,449
SPARK ‘PLUG
Charles E. Boyd, Chicago, Ill.
Application September 12, 1934, Serial No. 743,669
Renewed March 5, 1937
4 Claim.
This invention relates to improvements in spark
plugs for internal combustion engines.
(Cl. 123-169),
gasket l8 may be used for sealing the joint be
tween the shell IO and the wall I‘. >
It is an object of my invention to provide a
The shell I0 is tubular in form and is adapted
spark plug which is self~cleaning in use, which
will ?re longer without becoming fouled with
to receive an insulator 20,'which is intended ‘to ,
be
of the best grade of refractory and having a f‘; ’
oil, which will maintain a ?xed spark gap, which
will generally have a longer life and which may
be readily assembled and disassembled.
It is further an object of my invention to pro
vide a spark plug in which the ground electrode .
is positioned diametrically of the plug and will
act to split and de?ect the oil to prevent clogging
and fouling of the spark gap by the oil.
an additional gasket 30 above the shouldered por
tion 26 of the insulator. An electrode 32 extends
axially through vthe insulator 20 and the outer
extremity 34 of the electrode is provided with a 115
terminal connector 36. The inner'extremity 38
of the electrode 32 protrudes for a short distance
beyond the tip 22 of the insulator;
'20
I
j
,
I provide a ground electrode 40 positioned dia
metrically with respect tojthe shell l0 and ?xedly .20
secured at its ends to the shell I0. It'will be
apparent that since the electrode 40 isrlgidly
m 2 E on Q. a :3
position, that it isnot subject to de
25
?ection by the heat andtherefore the spark ‘gap
between the ground electrode
40 and the- central 2s
electrode 38 remains
30
following description taken in connection with
35 the attached drawing, in which
Figure 1 is a side elevation of my improved
plug and showing in section a portion of the
cylinder wall in which the spark plug is mounted;
Figure 2 is a side elevation of the spark plug,
40 the view being taken at right angles to that of
Figure 1;
Figure 3 is a vertical section taken on the plane
indicated 3—3 in Figure 2;
45
Figure 4 is a plan view of the lower end of the
plug;
Figure 5 is a side elevation of a modi?ed form
of the plug, and
Figure 6 is a plan view
the plug shown in Figure 5. of the bottom end of
50
The spark plug in the usual manner includes a
metallic shell l0 having a threaded portion 12
whereby the plug may be threaded into the cylin
, as illustrated in Figure 1. The head
of the shell 10 is formedwith a nut portion [6
65 for threading the plug into the wall I4 and a
vented from fouling the spark gap.
I provide novel means forventing ‘the spark 135
2,106,449
2
v
substantially thin ring-shaped portion at the low
.
The lateral openings 42 provide vent openings
er end of said shell and said openings being lat
for the spark gap and also form a ring-shaped
portion 44. This relatively thin metal ring may
also be formed by a plurality of openings such
as shown in Figure 5 to be presently described,
wherein the ring is supported from the body of the
erally disposed with respect to the axial spark
gap between the electrodes.
2. A spark plug comprising a substantially tu
bular metallic shell adapted to be threaded into
a cylinder wall, a notched vent opening formed in
the lower end of said shell below the threaded
portion thereof by a substantially horizontal cut
and an angular cut, a ground electrodejdiamet 10
shell by several narrow portions. The ring read
ily heats up during use of the plug and therefore
burns off any oil or other matter deposited there
on. The ground electrode associated with the
10 ring portion is also maintained at a relatively
high temperature and thus is self-cleaning. This
self-cleaning feature is also present in the center
electrode which is covered and protected by the
15
‘
rically positioned with respect to the lower end
of said shell and ?xedly secured to said shell im
mediately beneath said notched opening, an in
sulator centrally positioned within said shell and
removably secured thereto, the lower end of said
insulator 22 except for the lower tip 33. This
tip therefore readily heats up and likewise burns
off the oil that may be deposited thereon.
Although I have shown in Figures 1 to 4. a pre
insulator terminating substantially adjacent the
upper edge of said‘ notched opening and an elec
trode carried by said insulator and axially pro
jecting from the lower end thereof to provide an
ferred design of my plug, it will be obvious that
20 other forms may be resorted to without departing
axial spark gap with respect to said ground elec
trode, whereby said vent opening isv laterally dis
from the spirit of my invention and the venting
openings may be formed in different manners.
For example, I have shown one modi?ed con
struction in Figures 5 and 6 in which the spark
plug construction is substantially as that dis
closed in Figures 1 to 4 except that the shell l9,
, instead of being formed with notched openings, is
provided with a plurality of radial holes 553. In
both forms it will be apparent that the venting
30 openings are laterally disposed with respect to
the spark gap and it should also be noted that
the lower or inner end of the insulator 2i] termi
nates in a horizontal plane with or preferably
above the inner and upper edges of the venting
35 openings in order to prevent fouling of the insu
lator and burning of the electrode. It has been
posed with respect to said spark gap.
found by test that spark plugs as disclosed herein
will have a' longer life without‘failure than other
plugs now on the market when used under similar
and it is believed that the improve
40 conditions
ments in operation are due to the novel arrange
ment and cooperation between the ground elec
trade and the venting openings.
Various changes and modi?cations may be re
sorted to in the practice of my invention without
45 departing from the spirit of my invention as ex
pressed in the appended claims.
I claim:
'
‘l.'A spark plug comprising a metallic shell
50
'
3. A spark plug comprising a substantially tu
bular metallic shell having an external thread 25
thereon whereby said shell may be threaded into
a cylinder wall, the lower end of said shell be
neath said external thread having a pair of
notched openings cut therein through a large area
thereof and de?ning at the lower end of said
shell a substantially thin ring-like portion sup
ported from the body of said shell by relatively
narrow uncut portions, a ground electrode di
ametrically positioned with respect to said ring
like portion and ?xedly secured at its ends there
to, an insulator centrally positioned with respect
to said shell and removably secured thereto, a
central electrode carried by said insulator and pro
jecting from the lower end thereof to leave a sub
stantially axial spark gap between said electrodes
whereby oil is deflected from said spark gap by
said ground electrode and vented through said
opening to prevent fouling of the plug.
'
4. A spark plug comprising a metallic shell, an
insulator centrally positioned within said shell,
an electrode ?xedly secured to the lower end of 45
said shell, an axially disposed electrode carried by
said insulator and projecting from the lower end
adjacent to said ground electrode to leave a spark
gap, said shell having a plurality of notched open
ings formed therein above said ground electrode 50
adapted to be threaded into a cylinder wall, a
and disposed substantially laterally with respect
ground electrode diametrically positioned with re
to the spark gap, said notched openings having a
spect to said shell and ?xedly secured at its ends
size and being arranged so as to leave a substan
to the lower end of said shell, an insulating elec
tially thin ring-shaped portion at the lower end
of said shell, whereby said relatively thin ring 55
portion will heat up readily and burn o? any oil
trode-retaining body positioned centrally within
said shell and removably secured thereto to provide
55 an axial spark gap, said shell having notched
openings formed therein adjacent the lower end
thereof and above said ground electrode, said
notched openings being so formed as to leave a
that may be deposited on the ring or on the
ground electrode having association therewith.
'
CHARLES R. BOYD.
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