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Патент USA US2122160

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June 28, 1938.
H_ ¢_ SHERK
‘2,122,160
RES ISTOR
Filed Odt .' 26, 19:55
IN VEN TOR.
BY 7%,
A TTORNEYS.
2,122,150
Patented June 28, 1938
UNITED STATES
PATENT OFFFCE
2,122,160
RESISTOR
Harold C. Sherk, Erie, Pa., assignor to Eric Re
sistor Corporation, Erie, Pa., a corporation of
Pennsylvania
Application October 26, 1933, Serial No. 695,362
10 Claims. (Cl. 201—64)
The present invention is designed to provide a A connector I5 is electrically connected with one
resistor of a form particularly advantageous in
avoiding disturbances caused by spark circuits
of automobiles in which it is desired to install a
radio. In the present invention the resistor is so
formed that it may be readily attached to the
ordinary standard spark plug. With such re
.71.
sistors it is desirable to include a resistor ele
ment of su?icient length and cross section to
‘ assure ef?cient and uniform operation and at
'10
the same time form a structure occupying small
space and fully protected from outside contacts.
It is also preferable to form the resistor so that
it may be attached on the spark plug as close
to the gap as possible in order to have as little
conductor surface between the gap and the re
sistor as possible. In the present invention a
comparatively long resistor element is provided
with a convenient and small space and the struc
ture as a whole is completely protected from out
side disturbance. Features and details of the
invention will appear from the speci?cation and
claims.
-
A preferred embodiment of the invention is
NJ in illustrated in the accompanying drawing as fol
lows:———
Fig. 1 shows an elevation of a spark plug with
the resistor in place thereon.
Fig. 2 an enlarged view, partly in section, of
the resistor.
Fig. 3 a section on the line 3—3 in Fig. 2.
Fig. 4 a section on the line 4—4 in Fig. 3.
Fig. 5 a plan view of the resistor element.
I marks a spark plug. This may be of any
standard form ordinarily having an upper screw
threaded terminal 2 with the usual spark gap la.
The resistor has a sleeve 3 which is adapted to
be screwed on to the upper end 2 of the spark plug.
This sleeve is provided with a shoulder 4 and a
40 nurled or roughened edge 5. An upper ter
minal B for the resistor has a shoulder l which is
provided with a nurled, or roughened edge 8 and
an extension 9 below the shoulder which is of
the same diameter and concentric with the
sleeve 3.
An insulating ring 10 is arranged around the
sleeve and in contact with the shoulder 4. An in
sulating sleeve H is arranged around the sleeve
3 and extension 9 and has a ?ange l2 the surface
of which opposes the ring It.
A resistor element 13, preferably of a molding
composition, is in the form of a split ring. The
ends of the split ring are plated with conductor
material at H. Ordinarily this is provided by
55 spraying a copper coating on the end of the ring.
conductor end M of thesplit ring and the sleeve
3. A similar connector it is electrically con
nected with the connector end 54 on the opposite
end of the ring and this connector is electrically _
connected with the shoulder l of the terminal 6.
Preferably an insulating separating piece I‘! is
provided between the sleeve 3 and the end of the
extension 9.
,
With the parts so far described in assembled
position the parts are encased in a material,
such as bakelite, and the assembly placed in a
mold and a case I8 is formed in the closing of
the mold setting of the bakelite under heat and
pressure. The case so formed entirely encloses
the resistor parts and secures these parts in
assembly. In order to more de?nitely secure
the terminals the nurled, or roughened surfaces
5 and 8 are provided which, as the bakelite, or
encasing material is molded and subjected to 20
pressure flows into the indentures formed in the
metal terminals and thus assures a union. The
element in the form of the ring gives a desirable
length of resistor element in a very small space.
The opening through the ring is utilized for the 25
terminals and the whole assembly has a cylindri
cal form with the axis of the terminals as a center
without obstructions and the bakelite completely
insulates as well as encloses the element and
parts from any accidental contact from without. 30
What I claim as new is:—
1. In a resistor, the combination of a split ring
of composition resistor material; separated and
oppositely axially extending terminals for the
ring; insulation for the split ring; and electric
connections between circumferentially spaced
portions of the ring and the terminals, said con—
nections being within the axially projected area
of the ring,
2. In a resistor, the combination of a split ring 40
of composition resistor material; separated and
oppositely axially extending terminals for the
ring concentric with the ring; insulation for the
split ring; and electric connections between cir
cumferentially spaced portions of the ring and 45
the terminals, said connections being within the
axially projected area of the ring.
3. In a resistor, the combination of a split ring
of composition resistor material; separated and
oppositely axially extending terminals for the 50
ring, one of which is screw-threaded; insulation
for the split ring; and electric connections be
tween circumferentiallly spaced portions of the
ring and the terminals, said connections being
within the axially projected area of the ring.
55
2
2,122,160
4. In a resistor, the combination of a split ring
of composition resistor material; separated and
oppositely axially extending terminals for the
resistor; connections between the terminals and
circumferentially spaced portions of the ring;
and means insulating and encasing the ring and
connections comprising a case molded to the
terminals and uniting the terminal and ring as
sembly, said terminals and connections being
10 within the axially projected area of the case.
5. In a resistor, the combination of a split ring
of composition resistor material; an insulating
sleeve Within the ring; axially directed terminals
extending into the sleeve; connections between
15 the terminals and circumferentially spaced por
tions of the resistor ring; and a case secured to
the terminals and enclosing the ring and con
nections and securing the parts in assembly.
6. In a resistor, the combination of a split ring
20 of composition resistor material; an insulating
sleeve within the ring; axially directed terminals
extending into the sleeve; connections between
the terminals and circumferentially spaced por
25
tions of the resistor ring; and a case molded to
the terminals and enclosing the ring and secur
ing the parts in assembly.
7. In a resistor, the combination of a split ring
of composition resistor material; an insulating
means comprising a sleeve within the ring and
30 extending portions over the face of the ring;
axially directed terminals extending into the
sleeve; and connections between circumferen
tially spaced portions of the ring and the ter
minals.
35
‘
8. In a resistor, the combination of a split ring
of composition resistor material; an insulating
means comprising a sleeve within the ring and
extending portions over the face of the ring;
axially directed terminals extending into the
sleeve; connections between circumferentially
spaced portions of the ring and the terminals;
and a case secured to the terminals enclosing
the ring and securing the terminals, ring and in—
sulation in assembly.
9. In a resistor, the combination of a split ring
of resistor material; an insulating means com 10
prising a sleeve within the ring and extending
portions over the face of the ring; axially directed
terminals extending into the sleeve, said termi
nals having shoulders extending over the insula
tion at the ends of the sleeve; connections be 15
tween circumferentially spaced portions of the
ring and the terminals and a case secured to the
terminals enclosing the ring and securing the
terminals, ring and insulation in assembly.
10. A resistance device comprising a molded 20
block of non-conductive material, a hollow in~
ternally threaded terminal member embedded in
one end of the block and having an open end, a
second terminal member having an enlarged por
tion embedded in the block at its opposite end
and provided with an integral threaded post pro
jecting from the end of the block, a split annular
resistance element within the block intermediate
the embedded portions of the terminal members,
and conductor elements connecting the ends of 30
the split annular resistance element with the
terminal members, said terminal members and
resistance element being axially alined and said
resistance and conductor elements being em
bedded in said block of non-conductive material. 35
HAROLD C. SHERK.
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