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July 18, 1950
E, J, RENN|E
2,515,897
SPARK PLUG CABLE
Filed March l, 1946
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Patented July 18, 1950
2,515,897
UNITED STATES PATENT OFFICE
2,515,897
SPARK PLUG CABLE
Edward J. Rennie, Chester, N. J., assignor to
Breeze Corporations, Inc., Newark, N. J., a cor
poration oi New Jersey
Application March 1, 1946, Serial No. 651,061
2 Claims. (Cl. 174--36)
1
This invention relates to a shielded cable such `
as may be used to couple parts of a circuit, and
also for connecting ignition wires contained in
a manifold with spark plugs.
Where a fault exists in a portion of an ignition
wire outside the manifold it has been necessary,
when said wire was continuous. to remove the
entire wire from the manifold and replate it.
An object of this invention is to provide a
.
2
run and a detachable connection made in the
elbow so that the wire conductor is centrally dis
posed throughout its entire length and the maxi
mum resistance secured from the insulating ma
terial.
The invention consists of the construction,
combination and arrangement of parts, as herein
illustrated, described and claimed.
In the accompanying drawings, forming a part
ñexible shielded cable for connecting ignition
wires to spark plugs in such manner that any
fault occurring outside the manifold may be
hereof, is illustrated one form of embodiment of
quickly and economically repaired.
covering throughout the length thereof and ilex
ible throughout to permit of easy installation.
A further object of this invention is to pro
and in which:
Figure 1 is a sectional view of a complete em
bodiment of the invention, shown in combina
tion with an elbow spark plug connection;
Figure 2 is a plan view of the shielding conduit;
Figure 3 is a section taken on line 2-2 of
duce a shielded cable which may be used in con`
Figure 1; and;
junction with shielded spark plug connectors, 20
Figure 4 is an enlarged sectional View of the
ceramic sleeve shown in Figure 1.
Another object of this invention is to produce
a shielded ca-ble having a continuous insulating
said cable carrying the insulated wire well with
in the body of the spark plug connector so as to
the invention, in which drawings similar refer
ence characters‘designate corresponding parts,
Referring to the drawings, and particularly to
Figure 1, I 0 designates a length of conduit formed
of spirally wound tubing II having a wire braid
- A final object of this invention is to provide a
shielded cable having an ignition wire sur 25 covering thereon. This conduit construction is
disclosed in United States Patent to Joseph J.
rounded by insulation to maintain its central
location within the conduit. Said insulation also
Mascuch, Number 2,028,793, dated January 28,
1936. A coupling nut I2 is slipped over each end
serves to i111 the inside of the conduit and there
by eliminate all air spaces. This prevents the
of the conduit I0. Ferrules I3 are then soldered
_condensation of moisture and ionization of gases 30 on the ends of the wire covered spiral tubing I I.
An end terminal I4 is soldered on one end oi
within the conduit which might result in insula
a length of ignition wire I5 and the wire passed
tion failure.
It is found that when a wire covered by a layer ' through the conduit I0. A desired portion of the
ignition Wire I5 is allowed toextend beyond each
of insulation is disposed in a shielding conduit,
and the space between insulation and conduit 35 end of the conduit I0.
The assembled conduit I0, wire I5 and terminal
ñlled with a viscous insulation material, the flow
I4 are then placed upon a jig which comprises
of the insulation is hindered due to the narrow
space with the result that some spaces may be
part of a moulding device (not shown). Said
left along the assembly which are not completely
jig supports the conduit Ill in a straight line and
illled with insulation. Any such air pockets re 40 pulls the ignition wire I5 taut therein. The
duce the insulation resistance and may collect
wire I5 is also located along the central axis of
moisture which is a potential hazard and eventu
the conduit I0. The moulding device then forces
ally will be instrumental in causing an electrical
a plastic-insulation material I6, such as a syn
failure in the cable. When. however. a bare wire
thetic rubber gum having good dielectric prop
is used instead, the greater space around lthe wire 45 erties, into the conduit. The insulation I6 is
permits the free flow of the insulation, with the
thereby caused to ñow around the ignition wire
I5, holding it in its axial alignment and iilling
resultthat no such deleterious air pockets are
all the air spaces within the/conduit. A very ilex
formed.
'
Also, in a known construction in which an in
ible and plastic assembly results when the gum
sulated continuous conductor is run through an 50 I6 has been cured by heat.
elbow attached to a shielding conduit and the
A male plug Il, I8 is formed on each end of
space ñlled with insulating compound. it is im
the conduit I0, while it is in the moulding de
vice, by covering the ignition wire I5 with the \
possible to' centralize the conductor so that the
desired thickness of insulation I6. Shoulders I9
maximum insulation is not secured. In the pres
moulded from the insulating material I8 and in
ent construction the lead is made in a straight
prevent electrical leakage.
2,515,897
tegral therewith are formed at each end of the
conduit I0. Said shoulders I9 are compressed
by the coupling nut I2, on one end, between the
ferrule I3 and the spark plug elbow 20 to which
the conduit I0 is connected, and the ferrule- I3
and manifold outlet (not shown) by the nut I2
on the other. This improves the watertight fea
tures of the shielding conduit I0.
The male plug I8 is reduced in diameter at 2'I
to accommodate a ceramic sleeve 22. The sleeve
22 shown in Figure 4 has a ceramic wall 23 there
in integral therewith and having a central open
ing 24. The wall 23 is spaced from one end of
the sleeve 22.
'
The plug I9 supports the ceramic sleeve 22,
which is slipped over it so that the threaded end y
of the terminal I4 held therein projects through
projecting threaded portion, a ceramic sleeve slid- '
ably received upon a reduced diameter of said
male plug `having a ceramic wall therein integral
with said sleeve and spaced from the end thereof,
isaid wall being pierced to allow passage of the
projecting threaded portion of said terminal, a
nut adapted to screw on to the end of said termi
nal threads and a spring attachably held by said
nut and on the other end a button-shaped disc-
having the said ignition wire divided, slipped
through the holes thereof and twisted together to
hold said terminal assembly to the male plug.
2. In a shielded connecting cable, a ccntinuous
flexible dielectricv core therein, entirely illling said
cable, carrying an ignition wire and extending
beyond each end of said shielded cable to form a
flexible male plug integral with said core,
shoulders on said plug integral therewith and ad
the opening 24 in the ceramic wall 23. A nut 25
having a spring 26 secured thereto is threaded
jacent each end of the shielded cable and con
upon the terminal at I4. The spring 26 and 20 tact terminals at the ends thereof, comprising. on
nut 25 thus ñt into the small socket formed by
one end, in combination, a soldered terminal hav
the ceramic sleeve bore and the ceramic wall 23.
ing a projecting threaded portion, a ceramic
This maintains the axial alignment of the
sleeve slidably received upon a reduced diameter
spring 26.
of said male plug having a ceramic wall therein
The opposite male plug I1 is completed by plac 25 integral with said sleeve and spaced from the end
ing a button-shaped metal terminal 21 on the
thereof, said wall being pierced to allow passage
end thereof, dividing the strands of the ignition
of the projecting threaded portion of said termi
wire I5, threading them through the two holes
nal, a nut adapted to screw onto the end of said
23 of the said -terminal 21 and twisting the
terminal threads and a spring attachably held by
strands of ignition wire I5 together to hold the 30 said nut and on the other end a button-shaped
terminal 21 in place.
_
disc having the said ignition Wire divided, slipped '
The completed shielded cable is then ready to
be used either with the well known shielded spark
plug elbow 20, as shown in Figure 1, or in any
other convenient circuit. If used with the
shielded spark plug elbow 20, the male plug I3
through the holes thereof and twisted together to
hold said terminal assembly to the male plug.
carr-ies the terminal well within the body of said
The following references are of, record in -the
elbow 20 greatly decreasing any danger of elec
`
EDWARD J. RENNIE.
~ REFERENCES CITED
file of this patent: -
trical leakage. The spring 26 is held in ilrm con
I
UNITED STATES PATENTS
tact with the terminal 29 moulded into the in 40
sulation 39 of the elbow 2D by the coupling nut I2
Number
Name
Date
Having thus fully described the invention,
what is claimed as new and desire to be secured
by Letters Patent of the United States, is:
2,016,856
2,028,793
Fiege ............. __ Oct. 8, 1935
Mascuch ......... __ Jan. 28, 1936
2,071,570 „
Rabezzana ________ -_ Feb. 23, 1937
each end of said shielded cable to form a ñexible
2,108,504
2,134,946
2,312,757
2,367,175
Nowosielski '_ ...... __ Feb. 15,
Hurley ____________ __ Nov. 1,
Frei ______________ -_ Mar. 2,
Hahn _____________ -_ Jan. 9,
male plug and contact terminals integral with
2,381,595
Hulflsh ............ -_ Aug. 7, 1945
2,402,049
Ingalls __________ __ June 11, 1946
2,402,503
McCutchan ______ __ June 18, 1946
1. In a shielded connecting cable, a continuous 45
di-electric core therein, entirely filling said cable,
carrying an ignition wire and extending beyond
said core at the ends thereof comprising, on one 50
end, in combination, a soldered terminal having a
1938
1938
1943
1945
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