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Патент USA US2130208

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Patented Sept. 13, 1938
2,130,208
UNITED STATES PATENT OFFICE
2,130,208
SPARKING PLUG
William John Vincent, Cardiff, Wales
Application March 3, 1937, Serial No. 128,851
In Great Britain March 3, 1936
1 Claim.
(CL' 123-169)
This invention relates to improvements in
source of electric current such as a battery (not
sparking plugs for internal combustion engines,
shown), the current being controlled from any
and more particularly to sparking plugs in which
convenient position such as the dash-board of a
car. The sleeve I I is surrounded by insulation I3
a heating resistance element adapted for con
‘ nection to a low tension battery is incorporated
with the plug for the purpose of heating the
sparking plug and driving off condensation prod
ucts and facilitating ignition. The present in
vention has for an object an improved construc
10 tion of sparking plug of this type.
In accordance with the invention, a sparking
plug comprises in combination with a plug body
a central electrode, said central electrode hav
ing a lower free end extending within said plug
1' body, a conducting sleeve surrounding and in
sulated from said central electrode, a conduct
ing bush surrounding and insulated from said
conducting sleeve, a gland nut engageable with
said bush to hold said bush in said plug body, a
resistance coil disposed around and spaced from
the lower free end of said central electrode, said
resistance coil being adapted to be heated from
a source of low tension current, the resistance coil
being connected at one end to said conducting
25 sleeve and at the other to said bush and means
remote from the plug body providing connec
tion between said conducting sleeve and the
source of low tension current.
The single ?gure oi’ the accompanying drawing
30 shows in cross section a sparking plug construct
ed in accordance with the present invention.
Referring now to the drawing, I denotes the
tubular plug body, and 2 the central or main
electrode.
The shank of the central electrode 2 is sur
rounded over the major portion of its length by
an insulating sleeve 4 embraced by a metal con
ducting sleeve II to which is attached between
the ?xed nut I and the locking nut I5, a low ten
sion conductor I2. The high tension conductor 8
is clamped to the central electrode 2 by means
of a‘ ?xed nut I II and a locking nut I8. Suitable
insulating members I! and II are mounted under
45 the fixed nuts ‘I and It, respectively. The con
ductors 9 and I 2 may be led to any convenient
embraced by a ?anged conducting bush J engaged 5
by the gland nut 6, threaded into the plug body I.
To the inner end of the sleeve II is attached one
end of a resistance coil element 8a surrounding
the inner end portion of the central electrode 2
within the pocket ‘I so that, when the sparking 1o
plug is in use, combustible gases may enter the
pocket 1 and be ignited by the coil 8a in the event
of failure of the sparking plug to ignite such
gases. I4 denotes the earthed electrodes of the
plug. The resistor coil 8a is earthed by connec- 1‘
tion to the bush 5.
As will be clear, the resistor coil to in the po
sition shown serves not only to maintain the plug
points free from moisture and to heat up the
plug in order to facilitate starting, but serves 20
also as a preheater for the combustible gases en
tering the pocket ‘I.
_
'
The resistor coil 8a, while being exposed to the
combustion gases, is shielded by the plug body I
from fuel spray when used in engines operating 25
under so-called solid-injection fuel systems.
I claim:
-
A sparking plug comprising in combination
with a plug body, a central electrode, said central
electrode having» a lower i'ree end extending with- 30
in said plug body, a conducting sleeve surround
ing and insulated from said central electrode, a
conducting bush surrounding and insulated from
said conducting sleeve, a gland nut engageable
with said bush to hold saidbush in said plug 35
body, a resistance coil disposed around and spaced
from the lower free end of said central electrode,
said resistance coil being adapted to be heated
from a source of low tension current, the resist
ance coil being connected at one end to said con- 40
ducting sleeve and at the other to said bush and
means remote from .the plug body providing con
nection between said connecting sleeve and the
source of low tension current.
WILLIAM JOHN VINCENT. ' u
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