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Патент USA US2131937

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Oct. 4, 1938.
2,131,937
R. DEwAR ET AL
INSULAT ING COVER
Filed May 17, 1954
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MÍ
NVENTOR.
BY ¿1MM 1,
ATTORNEYS.
Patented Oct. 4, 1938
2,131,937
` UNITED STATES PATENT OFFICE
2,131,937
INSULATING COVER
Robert Dewar and William T. Sanford,
I-Ioosick Falls, N. Y.
Application May 17, 1934, Serial No. 726,060
3 Claims.
(Cl. 123-148)
This invention relates to insulated covers or
caps, and especially to insulated covers or caps
member I0 and the housing members are desir
for the distributors or coils which are employed
in the ignition systems of internal combustion en
gines. As heretofore constructed, such covers or
caps were made from a material, such as Bakelite,
compound having a dielectric strength of at least
300 Volts per milliampere to prevent failure of
having a high insulating value, and they were
provided with a centrally disposed housing mem
ber adapted to receive a conductor which led
from the spark coil to the rotor element of the
distributor and with a plurality of peripherally
disposed housing members adapted to receive con
ductors which led from the contact elements of
the distributor to the spark plugs of the system.
In many instances, however, it is desirable to
adjust the intensity of the spark to- obtain maxi
mum efiîciency, and for this reason it is now com
mon practice to employ auxiliary spark intensify
ing devices between the distributor and the spark
plugs.
This arrangement however, is unsatis
factory due principally to the fact that the aux
iliary unit frequently becomes disconnected from
the system, thereby causing open circuits.
In accordance with the present invention, how
ever, the above objection obviated by incorporat
ing adjustable spark intensifying devices in the
housing members of the cap or cover of the dis
tributor.
For a clear understanding of the invention ref
erence may be had to the accompanying drawing.
In the drawing, the invention is shown merely in
preferred form and by way of example but obvi
ously many variations and modifications may be
made therein which will still be comprised within
C its spirit. It is to be understood, therefore, that
the invention is not limited to any specific form
or embodiment except in so far as such limitations
are specified in the appended claims.
Referring to the drawing:
O
Figure l is an elevational view in section show
ing one embodiment of the invention;
Figure 2 is an elevational View in section show
ing another embodiment of the invention; and
Figure 3 is an enlarged view in detail of the
adjustable unit employed in the present invention.
ably moulded as a unit and from a substance or
the device after it has been in use.
A metallic
terminal I3 is positioned in the lower end of each
of the housing members, the lower end of the
terminal positioned in the centrally disposed hous
ing member I I being provided with a carbon con
tact button I4 through which contact is con
stantly made with the usual rotor arm (not
shown) and the lower ends of the terminals posi
tioned in the peripherally disposed housing mem
bers being extended downwardly to form exposed
terminals I5 through which contact is made with
the rotor arm as it rotates.
The method of es
tablishing electrical communication through the
distributor cap is well known and detailed descrip
tion thereof is not deemed necessary.
In one embodiment of the invention, as shown 20
in Fig. l, the upper ends or contacting surfaces
I6 cf the terminals I3 in the housing members is
in contact with the moulding compound or sub
stance but this is desirable only when the com
pound or substance has an exceedingly high break 25
down strength as for example, a break down
strength greater than 300 volts per milliampere
since under such conditions there is substantially
no current leakage from the terminal through the
30
compound or substance.
In another embodiment of the invention, as
Shown in Fig. 2, the central portion of the upper
ends of the terminals I3 in the housing members
form projecting studs I'I so as to provide an air
space between the upper ends or contacting faces
I6 and the moulding compound or substance.
The upper end of each of the housing mem
bers is provided with means whereby an adjust
able spark intensifying device may be assembled
therein, and to this end the upper end of each of 40
the housing members is provided with screw
threads I8. As shown more clearly .in Fig. 3, the
spark intensifying device desirably employed com
prises a tubular member 2B adapted to receive the
end of an insulated conductor (not shown) and 45
Figure 4 is a detail cross section of the intensify
ing device mounted in the housing.
As shown, the cover comprises a cup-shaped
member I0 from the central portion of which a
housing member I I opens outwardly and from the
periphery of which a plurality of similar housing
members I2 open outwardly in spaced relation.
the lower end of which is closed to form a con
tacting face 2|. The outer upper surface of the
tubular member is provided with screw threads
22 adapted to engage the screw threads I8 in the
housing members so that the position of the de 50
vice may be varied in the housing members to vary
The number of peripherally disposed housing
members correspond to the number of spark
plugs in the system. The cover or cup-shaped
Having thus described our invention, we claim:
l. In combination, an insulating cover compris
ing a cup-shaped member having a housing mem
the spark intensifying properties of the device.
2
2,131,937
ber extending outwardly therefrom, and a` spark
intensifying device positioned in said housing
member, said device comprising a tubular member
closed at one end to form a contacting face and
open at the other end to receive a conductor.
2. In combination, an insulating cover compris
ing a cup-shaped member having a housing mem
ber extending outwardly therefrom, and an ad
justable spark intensifying device positioned in
10 said housing member, said device comprising a
tubular member closed at one end to form a con
tacting face and open at the other end to receive
a conductor.
` 3. In combination, an insulating cover compris
ing a cup-shaped member having an internally
threaded housing member extending outwardly
therefrom, and a spark intensifying device posi
tioned in said housing member, said device com Ol
prising a tubular member having its upper end
open and in threaded engagement with said hous
ing member and its lower end closed and out of
contact with said housing member.
10
ROBERT DEWAR.
WILLIAM T. SANFORD.
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