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0¢t~ 22, 1946-
D. B. BRowNE ErAL
2,409,732
SCREENING DEVICE FOR SPARK PLUGS
Filed Oc't. 1l, 1943
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_ Oct 22, v1946-
2,409,732
D. B. BRowNE ETAL
l. SCREENING DEVICE FOR SPARK PLUGS
Filed- Oct. ll, 1943
2 Sheets-Sheet 2
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Patented Oct. 22, 1946
2,409,732
"UNITED, STATES PATENT OFFICE
e
2,409,732
SCREENING DEVICE Eon SPARK PLUGS
Donald Bennion Browne, Harpenden, Frederick
William Clarke, Totternhoe, and Rex Henry
George Painter, Dunstable, England, assignors
to General Motors Corporation, Detroit, Mich.,
a corporation of Delaware
l
Application October 11 , 1943, Serial No. 505,764
In Great Britain October 30, 1942
7 Claims. (Cl. 123-169)
This invention relates to screening devices for
spark plugs and has for its object the provision
of an improved screening device for spark plugs
of the kind which is capable of being ñtted to
existing plugs.
Accordingly the invention consists of a screen
ing device for spark plugs wherein the screen
(or a part thereof) has a means for effecting its
quick attachment to or detachment from a spark
plug (or to or from a part of the screen tempo
2
said braid covering 8a besides being clamped be
tween the ferrule 'l and neck 6c being soldered to
the aforesaid neck 6c. The lower part 6b is
formed with an inwardly turned flange Ed having
cut therein a hexagonal opening 6e of slightly
larger dimensions than the usual hexagonal por
tion 9a of the spark plug 9 so that the lower end
of the said lower part 6b can be passed over the
hexagonaI portion 9a after a spark plug 9 has
10 been screwed into the cylinder of an internal
rarily non-detachably associated with a spark
combustion engine in the known manner. The
plug) -and wherein there is disposed within the
said inwardly turned flange 6d is also provided in
Screen (or the detachable part thereof) an insula
termediate the angles of the hexagonal opening 6e
tor which is capable of movement relatively to
with triangulated depressions 6)’ so that by pass
the screen (or detachable part thereof) and 15 ing the lower part 6b over the hexagonal portion
which is adapted partially to envelop a spark plug
9a and turning the screening device a portion of
and to which insulator the conductor lead may
a turn, the angular portions of the hexagonal por
be anchored and wherein spring means is inter
tion 9a can be caused to register with and to
posed between the insulator and the screen (or
seat themselves in the said depressions Gf. A
the detachable partoi the screen with which the 20 dimple 6g is pressed out of the lower part 6b in
insulator is associated) said spring, when the
order to ensure that the said lower part 6b can
device is in use on a spark plug, serving inter alia
only be turned in one direction (see Fig. 3) said
to ensure the attachment of the screen (or of the
dimple Ggin addition serving to locate the hexag
detachable part thereof) to a spark plug (or to
onal
portion 9a so that it will seat itself naturally
the part of the screen temporarily non-detach~ 25 into the
depressions Gf.
ably associated with the spark plug) and to secure
Disposed within the interior of the screen com
an eflicient electrical connection between the con
posed of the united upper and lower parts 6a and
ductor lead and a spark plug.
6b is an insulator I0 of hexagonal shape in cross
Convenient embodiments of the invention will
now be described with particular reference to the 30 section as indicated in Fig. 4. This insulator I0
is provided with a central reentrant portion Iûa
accompanying drawings wherein-adapted to ?lt over the upper portion of the plug
Figure 1 is a View partly in elevation, but main
9 as shown in Fig. 1. The insulator I0 is also
ly in vertical section, showing the improved
formed with a central bore through which is
screening device fitted to a spark plug;
passed the conductor cable 8. An end of the me
Figure 2 is an underside plan of the screening
device illustrated in Figure l;
' tallic conducting core 8b of this conductor cable
8 is secured to av button I2 of greater diameter
Figure 3 is a fragmentary view of the lower
than the central bore in the insulator IU so that
part of the screening device employed in the con
when the button I2 has been secured to the me
struction illustrated in Figures 1 and 2;
tallic core 8b the conductor cable 8 is anchored
Figure 4 is an underside plan of the movable 40 to
the insulator I0.
insulator incorporated in Figures 1 and 2, and
The insulator I0 is formed with an external
Figure 5 is a similar ñgure to Figure l, but
shoulder I 0b which serves as an abutment for
illustrating a modiñed construction.
the lower end of a coil spring I3 the upper end
-In the drawings like numerals of reference in
whereof
abuts a Washer I4 which serves to posi
dicate similar parts in the several views.
Referring first to the construction illustrated in
Figures 1 to 4, the screening device therein illus
trated comprises two pressed sheet metal parts 6a
and 6b, hereinafter called the upper part 6a and
the lower part 6b, the said upper and lower parts
6a, 6b being secured together permanently by a
rolled joint as illustrated in Figure 1. The upper
part 6a is formed with an upstanding neck 6c
' tion a rubber or libre sealing washer I5 which
is adapted to abut an internal shoulder 6h at the
upper part 6a of the screen`
The lower part 6b has connection with a strap
I6 to which is attached the usual earthing tag I l.
It will be appreciated that the coil spring I3
serves to maintain the screen on the spark plug
9 and t0 secure eflicient electrical connection be
tween the core 8b and the central electrode of the
said plug 9 and to press the sealing washer I5
usual braid covering 8a of the conductor cable 8, 55 into abutment with the shoulder 6h at the upper
between which and a ferrule 'I is secured the
2,409,732
3
end of the part 6a in order to ensure a weather
proof iitting of the screen to the conductor cable 8.
It will also be appreciated that the screening
device hereinberore described can readily be at
tached to or detached from a spark plug as may
be required without disturbing the spark plug
In the modification illustrated in Fig. 5 the
lower part 6b of the screen is provided with an
inwardly turned flange 6k which has therein a
circular hole of lesser diameter than the base 9b
of the shell of the plug 9, but oi' slightly greater
diameter than the threaded portion 9c of the said
shell so that the threaded portion 9c can be passed
through the hole and the inwardly turned flange
6k used in place of the usual gasket. The lower
part 6a is provided with a pair of oppositely dis
4
when the device is in use on a spark plug serving
to ensure the attachment of the screen to a spark
plug and to secure an eíiicient electrical connec
tion between the conductor lead and a spark plug
and also to maintain a weather-proof seal be
tween the screen and the conductor lead.
3. A screening device for spark plugs embody»
ing a screen formed in two parts one of which
is associated with a spark plug so that it cannot
be detached from the spark plug when in use,
means such as a pin and bayonet connection for
permitting of the ready attachment and detach
ment from the said temporarily non-detachable
part of the other part of the screen, an opening
in the detachable part for the passage of the con
ductor lead, an insulator which is movably
mounted within the detachable part and which is
posed outwardly projecting pins 61 which cci-open
adapted partially to envelop a spark plug and to
ate with complementary bayonet slots 6m formed
which the conductor lead may be anchored, a
in the lower portion of the upper part 6a.
The remainder of the screening device is sub 20 sealing means located within the detachable part
adjacent to the opening through which the con
stantially the same as that illustrated in Figures
ductor lead is passed and a spring means inter
1 to 4.
posed between the said insulator and sealing
In the modified construction, it will be seen
means, the spring means when the device is in
that the lower part 0b is normally temporarily
use on a spark plug serving to secure the two
non-detachably associated with the spark plug 9
parts of the screen together and to ensure an
and that the remainder of the screening device
eiTicient electrical connection ybetween the con
can be removed or ñtted as the case may be .by
ductor lead and a spark plug and also to main
disconnecting or connecting the bayonet joint be
tain a weather-proof seal between the detachable
tween the two parts.
part of the screen and the conductor lead.
30
We claim:
4. A screening device for spark plugs accord
1. A screening device for spark plugs wherein
ing to claim 2 wherein the hexagonal opening is
the screen (or a part thereof) has a means for
formed in an inwardly turned fiange and wherein
effecting its quick attachment to or detachment
triangulated depressions are provided in the por
from a spark plug (or to or from a part of the
tion of the flange intermediate the angles of the
screen temporarily non-detachably associated
hexagonal opening, said depressions serving to
with a spark plug) and wherein there is disposed
accommodate the corners of the hexagonal por
within the screen (or the detachable part thereof)
tion when the screening device is in use.
5. A screening device for spark plugs according
and which is adapted partially to envelop a spark 40 to claim 2 wherein means is provided for ensur
ing a one-way turning movement of the screen
plug and to which insulator the conductor lead
when. it is being attached to or detached from a
may be anchored and wherein spring means is
spark plug.
interposed between the insulator and the screen
6. A screening device for spark plugs according
(or the detachable part of the screen with which
to claim 2 wherein the hexagonal opening is
the insulator is associated) said spring, when the
formed in an inwardly turned flange and wherein
device is in use on a spark plug, serving ínter
triangulated depressions are provided in the por
alia to ensure the attachment of the screen (or
tion of the iiange intermediate the angles of the
of the detachable part thereof) to a spark plug
hexagonal opening, said depressions serving to
(or to the part of the screen temporarily non
accommodate the corners` of the hexagonal por
detachably associated with the spark plug) and
tion when the screening device is in use, and
to secure an efiicient electrical connection be~
wherein also means is provided for ensuring a
tween the conductor lead and a spark plug.
one-way turning movement of the screen when
2. A screening device for spark plugs embody
it is being attached to or detached from a spark
ing a screen which is provided at one end with
plug.
an opening for the passage therethrough of the
7. A screening device for spark plugs wherein
conductor lead and at the other end with a hex~
there is disposed within the screen an insulator
agonal opening of slightly greater dimensions
which is capable of movement relatively to the
than those of the hexagonal portion generally in
screen and which is adapted partially to envelop
corporated in a spark plug whereby by passing
the end with the hexagonal opening over the said GO a spark plug and to which insulator the conductor
lead may be anchored and wherein spring means
portion and imparting a partial turn to the
is interposed between the insulator and the
screen withdrawal of the screen from the hexag
screen, said spring means, when the device is in
onal portion is prevented, an insulator which is
use on a spark plug, serving, inter alia, press the
movably mounted within the screen and which is
an insulator which is capable of movement rela
tively to the screen (or detachable part thereof)
adapted partially to envelop a spark plug and to
insulator into enveloping relation to a spark plug
and to secure an efficient electrical connection
which the conductor lead may be anchored, a
between the conductor lead and a spark plug.
sealing means located within the screen at the
DONALD BENNION BROWNE.
end through which the conductor lead is passed,
FREDERICK WILLIAM CLARKE.
and `a spring means interposed between the said
REX HENRY GEORGE PAINTER.
insulator and sealing means, the spring means 70
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