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Патент USA US2117216

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May 10, 1938.
,
s. RUTHARDT
SPARKING
PLUG
2,117,216
'
7
Filed Sept. 25. 19:55 ‘
4W3
Jab’- W
Patented May 1c, 1933
v2,117,216
‘
" UNITED STATES PATENT‘ OFFICE _
2.111.210 '
_
sranma PLUG
.Gnstav Buthardt, Stnttgart-Zn?enhausen,
Germany
‘
f Application September :5. ms, mm. mm
In Germany October 8, .1932
1 cum. .(ci. 123-109‘,
- This invention relates to spark plugs with a
by way of example in the accompanying drawins.
hollow body de?ning a central longitudinal pas
sage for the reception 0! a central electrode and
nal passage.
'niespark plug body a has a central longitudi
Several conical narrowings and
widenings b are provided in .this
tips. and with inwardly extending projections
e. ‘In
the walls of the doubleconical combustion cham- g
5 which subdivide ‘the passage into a plurality of 1
and decreasing cross-sectional area, for ‘ellecting
bers, of alternately increasing and decreasing _
cross-sectional area are formed by the narrow
a more thorough churning, and consequently a
more complete combustion of the mixture in the
grooves d are formed in the walls or the com
combustion chambers of alternately increasing
10, passaée-
.
~
-
.
ings and ‘widenings oi the
bustion chambers for the purpose speci?ed. The 10
tipscare?xedinthewallofthebodynatthe
~
It is an object of the; invention to provide an
improved spark plug of this type.
To this endha helical groove is made in the
walls of.the combustion chambers.
The helically shaped grooves in the double con
“ ical combustion chambers impart to the jet of
e. Helical
. upper end of a screw-threaded extension ‘portion.
_ The ends of the tips 0 are bent into the com
._bustion chamber surrounding the central eiec- ‘
trode c.
‘
burning gases the direction of a spreading or, ‘
point ?ame after the ignition oi the mixture.
The sparking plug is intended to ensure a
smooth running-oi the engine tree from knock
m ing, even when employing a'so-called poor mix ‘
ture. Even in the case or high compression en-l gines the spark plug can be employed with in
ferior fuel mixtures, such as gas oil, spirit mix
tures and the like, without detrimentally ailect-.
2‘ ing the output and the life of the engine.
An embodiment'o! the invention is illustrated‘.
_
I claim:--'
‘
-
-
I‘
-
A sparking plug for internal combustion en
gines, comprising in combination a hollow spark
ing plug body, mass-electrodes and a central elec
trode in said body, said body having a passage
extending to said electrodes and composed of a
plurality of alternate conically widening and‘nar
rowing sections, and having a helical groove
formed in the conically widening and narrow
ing sections of the passage.
‘
ous'rav Rum.
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