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Патент USA US2109030

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Feb. 22, 1938.
E. B. NOWOSIELSKI
- 2,109,030
IGNITION APPARATUS
Original 'Filed?uly 2. 1955
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INVENTOR.
Edward .B. A/owos/é/skf
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Patented
UNITED
Feb. 22, 1938STATES PATENT OFFICE
2,109,030
IGNITION APPARATUS
‘ Edward B. Nowosielski, Bloom?eld, N. J., assignor
' to Eclipse Aviation Corporation, East Orange,
N. J., a corporation of New Jersey
Original application July 2, 1935, Serial No. 29,
530. Divided and this application January 18,
1937, Serial No. 121,217
9 Claims. (Cl. 123-169)
This invention relates to spark-plugs, and more assembly to be further described. It will be
specially to spark-plugs for aviation engines. noticed that the spindle M2 extends upwardly‘ to
a point just above the end of the gland I‘! and,
/ e severe service conditions which are imposed
n spark-plugs for air-plane motors are familiar
5 to those skilled in the art, as is also the importance of enclosing all parts of the high-tension
current-carrying system by a continuous metal110 shield to prevent interference with the recep-
due to the reduction in cross-sectional area at
this point, and also by reason of the termination 5
of the copper jacket it at this point, there is a
tendency to cut off much of the upward ‘flow
of heat through the spindle l l2 and to deflect the
tion of signals by adjacent radio receiving sets,
10 and also to protect the exposed parts of the ig. nitlon system from detriment by the elements or
otherwise.
heat flow outwardly and radially into the copper
gland ll from which much of the heat is directly 1o
The object of this invention is to provide a
spark-plug, and more especially a shielded spark15 plug, the construction of‘which is such as to prolong its life and to insure its effectiveness in such
service, and to- afford convenience and economy
in manufacture.
The invention comprises novel features of great
20 utility in spark-plugs, and novel combinations of
in the metallic shell ll.
_
As a means of maintaining the mica stacl: M»
in the compressed condition and also applying 15
elements making an improved spark-plug and
an improved assemblage of the spark plug and
its high-tension conductor. This application is
a division of my application No. 29,530, filed July
25 2, 1935.
‘
dissipated by the cooling blast circulating in
chamber is by reason of the radial openings
radial pressure to hold the mica lining l5 of the
inner metallic sleeve ill in position, and at the
same time effecting an additional path for the
transfer of heat directly to the said sleeve it
fromv which it may be radiated to the atmosphere 20
by the cooling current of air ?owing along the
chamber it to and from the radial apertures 32,
the embodiment shown in Fig. 1 includes cap and
retainer elements lid and l ill to permit the use
of a method of assembly which results in a more 25
Some of the objects are to provide an improved
core construction including novel methods of
secure positioning of the mica insulation. As
shown, the method of assembly is to ?rst insert
constructing and assembling the core; to provide
improved heat de?ecting and cooling means"; and
the retainer M8 over the previously positioned
mica parts 48 and ‘t6 and. due to the internal
taper on the member Mil this act of inserting 3Q
the said member will operate to tend to turn in
30 to provide improvements in the manner of in~
sulating the current.
In the drawing,v
.
Figures 1 and 2 are views partly in elevation
and partly in section, each ?gure illustrating a
35 somewhat different embodiment of the invention.
In many respects both embodiments correspond
to the disclosure in my copending application No.
16,882, ?led April 17, 1935, and this is particular1y true of the features indicated in elevation in
40 the two embodiments; and where identical ele‘ ments appear in the two embodiments they are
wardly the upper extending end of the mica wrap
per 46. After this has been done the cap lid is
inserted, the lower end of the stem thereof being
slightly beveled to facilitate its passing the upper 35
edge of the mica wrapper. Then as the stem de- scends it exerts a tightening action upon the up
per portion of the mica wrapper Alli due to its
having a slightly larger external diameter
that of the inwardly bent portion of the mica 4o,
wrapper.
When fully inserted the radially ex
designated by similar reference numerals.
tending portion of the cap seats itself upon the
First describing-Figure 1, reference ‘character annular ledge in the retainer H8 with its upper
l l designates a metallic extension of the metallic surface ?ush with- the upper surface of said
45 body ill. As shown this part II extends upwardlyv ber, and thereby making it possible to apply a 45
-
to enclose the spindle H2 and the electrical connection between the same and the conductor
which leads the high-tensioncurrent to the spindie. This vshield extensionlis preferably in one
50 piece with the attaching nut ;5, though such unity
is not necessary.
‘
compressing force to both said elements which
may be transmitted to the mica assembly 48 but
without disturbing the upper end of the mica
wrapper 46 due to the slight annular clearance
indicated at E22.
50
The spring seat {I l3 of Fig. l rests upon an an
I provide a cooling and ventilating chamber l3
in the form of an annular space between the
nular rim W6 formed by recessing the upper end
of spindle H2. An asbestos disk W5 is inserted
shield extension II and a long thin cylindrical
in this recessed end to aid in deflecting the heat \
55 metallic sleeve I‘ having low thermal conductivlty, and lined with a tube I5 formed of rolled
mica constituting the wall of a second chamber
IE bounded at its lower end by the upper surface
flow away from spring 6!.
55
In‘ the embodiment of Fig. 2 the Spindle W 111"
eludes an upper thiniwalled Section l3! and an
upper upset end portion '32 of slightly thicker
of the compressible metal gland I1, and at its
60 upper end by a novel heat de?ecting and sealing
cross -section to pl‘cvide additional Strength along
the surface of contact with the retainer ring I33, 50
2 .
2,100,030
- and which receives a washer I54 against which
body above the spindle to form a socket for the
the upper end I32 of the spindle is upset in the
I33 and thus to the washer IB'l‘ and mica as
insertion of an insulated high-tension conductor,
a mica sleeve lining said barrel, a stack of mica
washers occupying space between said mica
sembly 48. , Otherwise this construction resem
sleeves and bearing on a shoulder of the body, and 5
process of applying pressure to the parts I54 and
bles that of Fig. 1, including the use of a stem H58
having a ?at base I56 resting upon thespring Bi.
These parts I33 and I54, when subjected to this
upsetting pressure applied to the spindle top, not
10 upon the washer I51 to compress the mica steel:
“and at the same time press against the ex
pansion ring 86! to cause the latter to grip the
mica lining to at a point approximately midway
between its ends, this ring iii being inserted and
'15 expanded against the lining I5 prior to the as
sembly of said tube within the shield extension
ii.
‘
By the process above described the cap as=
sembly and spindle, that is, the parts it, i515, i853
20 and ibl become a permanently integrated unit
which, by reason of its extremely tight fit with
the ring N36, is capable oi transferring consider»
able heat from the upper part of the plug to the
radiator tube i4. This-heat transfer is acceler=
25 ated by reason of the shunting effect of the as
means above, and spaced from, the upper end of
the spindle con?ning said stack.
4. A spark-plug comprising the combination _
of a central spindle, a sleeve about said spindle, a
body in which the spindle and its sleeve are ?xed,
a barrel extending upward from said body above__
the spindle to form a socket for the insertion of
an insulated high-tension conductor, a sleeve lin
ing said barrel, a stack of washers occupying space
between said sleeves and bearing on a shoulder of 15
the body, and means above, and spaced from, the
upper end of the spindle con?ning said stack.
5. In a spark plug having a central spindle,
a sleeve of insulating material around the spin
die, a stack of insulating discs surrounding said 20
sleeve, and means for enclosing and protecting
the upper end of said sleeve, said means including
a steel; retaining member having a tapered bore
?tting around said sleeve, and a second member
having an externally tapered shank ?tting with 25
bestos heat barrier I59, there being a similar , in said sleeve, and also having a head above said
asbestos heat barrier shown in Fig. 1.
After the cap ‘assembly has been secured by
the upsetting process above described, coil spring
30 6i, and stem I58 are inserted in position to-con»
sleeve, said head beingsupported by said stack
retaining member.
6. in a spark plug having a central spindle, a
sleeve of insulating material around the spindle, 30
a stack of insulating discs surrounding said sleeve,
tact the radially spread strands of the current
conducting wire 66 when the latter is installed in and means for enclosing and protecting the upper
place. Associated with the wire 68 is its cover
end of said sleeve, said means including a stack
ing 61 of insulating material, its outer metallic retaining member having a tapered bore ?tting
35 sheath 68, the swivel connection 69 soldered or ' around said sleeve, and a second member engage 35
otherwise secured thereto, and the detachable able with said sleeve and supported by said stack
coupling nut ‘Ii, all of which are brought into as
retaining member, said two members co-operat
sembled relationship with the parts previously ing to hold said sleeve in ?xed relation thereto.
described, by reason 01' the co-operating threads
7. In a spark plug having a central spindle, a
40 at the top of shell II.
wrapper of insulating material around the spin 40
Various changes, which will now appear to dle, s stack of insulating discs surrounding said
those skilled in the art, may be made in the form, wrapper, and means for enclosing and protecting
details of construction and arrangement of the the upper edges'of said wrapper, said means in
parts without departing from the spirit of the in
cluding a stack retaining member having a ta
45 vention, and reference is therefore to be had to
pered bore ?tting around said wrapper, and a 45
the appended claims for a de?nition of the limits second member engageable with said wrapper
of the invention.
and supported by said stack retaining member.
What is claimed is:—_
said‘ two members ‘co-operating to hold said
1. In a spark plug having a central spindle, a wrapper in ?xed relation thereto.
50 wrapper of insulating material around the spin
dle, a stack of insulating discs surrounding said
wrapper, and means for enclosing and protecting
the upper edges of said wrapper, said means in
cluding a stack retaining member having a ta
55
8. :In a spark plug having a central spindle, a 60
wrapper of insulating material around the spin
dle, "a body of insulating material surrounding
said wrapper, and means for enclosing and pro
tecting the upper edges of said wrapper, said
pered bore ?tting around said wrapper, and a' means including a body engaging member having
second member having an externally tapered at tapered bore ?tting around said wrapper, and
shank ?tting within said wrapper, and also hav
asecond member having an externally tapered
ing a head above said wrapper, said head being
supported by said stack retaining member.
2. A spark plug having the elements recited in
claim 1, and characterized by the fact that the
insulating wrapper is: bent inwardly by the pres
sure of the stack retaining member upon the
outer wall thereof, and is thereafter maintained
65 in said bentcondition under the oppositely di
rected pressures, ?rst, of the stack retaining
member, and secondly, oi’ the externally tapered
shank of said second member.
'
3. A spark-plug comprising the combination of
.a central spindle, a. mica sleeve'about said spindle,
a bodyin which the spindle and its mica sleeve
are ?xed, a barrel extending upward from said
55
shank ?tting within said wrapper, said two
members cooperating to hold said‘ wrapper in
?xed-relation thereto.
‘
00.
9. In a spark plug having a central spindle, a
sleeve of insulating material around the spindle,
‘a body of. insulating material surrounding said
sleeve,. and means for enclosing and protecting
the upper end of said sleeve, said means includ 65
ing'a body engaging member having a tapered
bore ?tting around said sleeve, and a second
member supported by said body engaging mem
her, and cooperating therewith to hold said sleeve
in ?xed relation thereto.
.
70
" EDWARD B. nowosmrsxr.
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