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Патент USA US2404658

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' July 23, 1946‘.
, 2,404,658
Filed April e, 1945
‘ nven'bor:
' urWRobinsonJr,
His Attorney
Patented July 23,1946
Arthur W. Robinson, Jr., Schenectady, N. Y., as
signor to General Electric Company, a vcorpo
ration of New York
Application April 6, 1943, Serial No. 482,036
1 Claim. (Cl. 250--27.5)
My invention relates to spark gap devices such
as are used in connection with ignition systems
for internal combustion engines.
An object of my invention is to provide an
improved ignition spark gap device. ,
Another object of my invention is to provide
an improved quenched spark gap device in which
the spacing between the discharge electrodes and
extends from substantially the outer periphery of
the electrodes to ‘a short distance beyond the
outer edges of the grooves I4, and the two elec
trodes and the spacing element iii are held in
the desired relative axial relationship by an an
nular insulating spacer I'I arranged about the
outer periphery of these elements. ‘An enclos
ing casing is formed about the discharge elec
the pressure of the gas in the device provide for
trodes and includes a substantially cup-shaped
an electrical breakdown discharge at substan-, in casing member I8 arranged about the spacer ll
tially a predetermined voltage.
and each respective electrode. Each electrode
Further objects and advantages of my inven
is electrically connected and is secured to its re
tion will become apparent and my invention will
spective casing I8 by being welded thereto at I9.
be better understood from the following descrip
This welded connection is made by forming the
tion referring to the accompanying drawing, and 15 outer edge 20 of each electrode with a relatively
the features of novelty which characterize my
small projection 2| which is arranged in engage
invention will be pointed out with particularity
ment with the inner surface of the casing I8.
in the claim annexed to and forming part of
In assembling the electrode in the casing, a weld~
this speci?cation.
ing terminal is connected to the electrode I0 and
In the drawing, Fig, 1 is an elevational view,
another welding terminal is connected to the
partly broken away, illustrating an embodiment
outside of easing I8, such that welding current
of my invention; Fig. 2 is a plan view, partly
passes therebetween through the projection 2|,
broken away along line 2-—2 of Fig. 1; and Fig. 3
so as to heat this projection. Pressure is applied
is a fragmentary sectional view of a part of a
to the casing I8 and the electrode I0 so as to pro
discharge electrode and its enclosing casing prior 25 vide a suitable weld between the ?ange 20 of the
to the ?nal step of assembly of an electrode in
electrode and the casing I8, as shown at III in
its casing.
Fig. 1. A pair of electrodes and casings then is
Referring to the drawing, I have shown a
quenched spark gap device adapted to be used
assembled with a spacer element I6 between the
outer portion of adjacent faces thereof to space
in an ignition system which includes a pair of 30 apart these faces substantially a predetermined
spaced apart electrodes having main body por
distance and with a spacer I'I arranged between
tions I0 and II each formed with an annular
the discharge electrode and the casing I8. Pres
groove I2 in one of the faces thereof. This forms
sure is then applied to the outer side of the cas
a central discharge portion l3 on each electrode,
ings I8 to hold these casings in position and
and a discharge face Id of suitable relatively hard 35 biases them towards each other and to bias the
electrically conductive material, such as tungsten,
electrodes toward the intermediate insulating
silver, or carbon, is fused, plated, or otherwise
spacer element I6. The adjacent edges of these
suitably secured to the central discharge portion
casings are then hermetically sealed together by
I3. In order to obtain an accurate spacing-be
a suitable insulating seal formed of an annular
tween adjacent discharge faces, the discharge
glass element 22 fused about the outer edges 23
electrode is formed by suitably grinding or other
of the casings. Due to manufacturing tolerances,
wise ?nishing the outer plane surface of the
it is substantially impossible to obtain a uni
discharge face I4 and the outer plane surface
formly satisfactory predetermined spacing be
of a supporting ?ange I5 formed on the outer
45 tween the discharge faces I 4 in such an assembly.
side of the groove I2, such that these outer sur
It is desirable, therefore, that this spacing be
faces both lie in the same plane. The desired
made as accurately as possible and that the pres~
predetermined spacing between the discharge
sure of the gas within the spark gap device be
faces I4 is obtained by arranging two discharge
regulated such that the discharge between the
electrodes with the faces I4 thereof adjacent each
faces I4 will take place at a substantially prede
other and spaced apart by an annular insulat
termined voltage. It is also desirable that a sub
ing element of substantially predetermined thick
stantially pure and inert gas be used to ?ll the
ness arranged intermediate the faces of the
space within the spark gap device in order to
?anges I5. This insulating spacing element I6 is
minimize pitting of the discharge faces. This is
formed of a suitable material, such as mica, and 55 obtained by evacuating the device through an
A quenched spark gap device including apair
opening 24 formed in one of the casings I8 and
V of spaced apart electrodes each having an an
?lling the device with a suitable gas, such as hy
drogen, neon, or argon, then evacuating the de
vice a second time and re?lling it with the same
nular groove in the face thereof adjacent the
other electrode, an intermediate insulating ele
ment of substantially predetermined thickness
gas. The opening 24 then is hermetically sealed
in any suitable manner, as by welding at 25, to
insure against the exchange of gas between the
surrounding atmosphere and the inside of the
discharge device.
The pressure of the gas in
the device is regulated such that with the spac
between adjacent faces of said electrodes ex
tending from substantiallythe outer periphery of
said electrodes to said grooves forming central
discharge portions, a, discharge face of relatively
10 hard electrically conductive material on said dis
charge portions, an insulating spacer about the
ing between the discharge faces, electrical dis
' outer periphery of said electrodes, a cup-shaped
charge breakdown occurs between the discharge
enclosing casing about said insulating spacer and
each of said electrodes, each of said casings be
ternating current voltage or any other suitable
predetermined voltage. In this manner, a uni 15 ing welded to its respective electrode providing
an electrical connection therebetween; means in-'
form breakdown voltage is assured irrespective
cluding an annular gas-tight glass seal about the
of variations in the manufacturing tolerances of
' adjacent ends of said cup-shaped casings for
the different elements used in each spark dis
faces between 1175 and 1225 peak volts of an al- N
charge device.
substantially hermetically sealing said device with
20 said casings insulated from each other and for
While I have illustrated and described a par
holding said casings biased toward each other to
ticular embodiment of my invention, modi?ca
maintain said electrodes biased toward said in
tions thereof will occur to those skilled in the
termediate insulating element, and hydrogen gas
art. I desire it to be understood, therefore, that
in said device at a pressure such that electrical
my invention is not to be limited to the particular 25 discharge breakdown between said discharge faces
arrangement disclosed, and I intend in the ap
at the spacing therebetween occurs at between
pended claim to cover all modi?cations which do
1175 and .1225 peak volts of an alternating cur
not depart from the spirit and scope of my in
rent voltage.
What I claim as new and desire to secure by 30
Letters Patent of the United States is:
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