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Патент USA US2118672

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May 24, 1938.
T. c. GREEN
2,118,672
JOINT AND CONNECTER
Filed Sept. 14, 1956
INVENTOR
BYTHOMAS C. GREEN
Q M
ATTORNEY
2,118,672
Patented May 24, 1938
UNITED STATES PATENT OFFICE
2,118,672
JOINT AND CONNECTER
Thomas C. Green, United States Marine Corps
Application September 14, 1936, Serial No. 100,689
3 Claims.
(01. 285-47)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 3'70 0. G. 757)
stalling the through connecter in the outlet hole
My invention relates to an electrically con
thereof, electrical contact between the sides of
tinuous, substantially ?uid impervious joint and the junction box and the through connecter is
to a connecter for connecting together an elec
dependent upon some part of the connecter rub
trically conductive element provided with an bing away sufficient paint during installation to
5 opening and an electrically conductive casing ele
make contact with the metal beneath. During
ment and for insuring electrical continuity and installation the nut is usually the connecter part
continuity of passage therebetween.
which is rotated in order to secure the connecter
In order to effectively shield extraneous appa
tightly in place and consequently when fortuitous
ratus against electro-magnetic and electro-static electrical contact occurs between the connecter 10
disturbances caused by ignition circuits of inter
and the sides of the junction box it is usually be
nal combustion engines, it is essential that the tween a face of the nut and the outside wall of
circuit be completely enveloped by a metallic sur
the junction box, where this mutual contact is
face; that the enveloping metallic surface be most subject to destruction by oil or corrosion
grounded at its ends and at suitable intervals
to moisture.
therebetween; and that the enveloping metallic due
With the foregoing preliminary discussion in
surface be electrically continuous throughout its view,
it is an object of my invention to provide a
length. Failure of the enveloping metallic sur
joint wherein the juncture between the joint
face to properly and effectively shield against the parts
is sealed against the exterior whereby elec—
deleterious disturbances generated by the ignition trical continuity through the joint is insured.
20
circuits is caused principally by lack of electri
It is another object of my invention to provide
cal continuity along the enveloping metallic sur
an electrically continuous joint wherein the junc
face, or an increase in resistance of the envelop
ing metallic surface over that at which optimum ture between the joint parts is maintained by
direct and intimate metallic contact, the said
shielding is obtained. This lack of electrical con
tinuity or increase of resistance.takes place at
the connecters and joints. forming a part of the
enveloping metallic surface. As long as the con
tacting surfaces of the connecters and joints are
, in intimate metallic contact and remain free from
dirt, oil, gasoline, or other extraneous matter, the
enveloping metallic surface will effectively shield.
If, however, the contacting surfaces of the con
necters and joints are not in intimate metallic
contact, or do not remain free from extraneous
matter, there will be a lack of electrical con
tinuity or an increase of resistance through the
connecters and joints with attendant interrup
tion or mal-functioning in the shielding proper
ties of the enveloping metallic surface.
J40
Shielding failure in aircraft shielding assem
blies is commonly caused by the through con
necter which connects a junction box adjacent
juncture being sealed against the exterior to thus '
preserve unaltered the resistance through the
joint.
it is another and further object of my inven
tion to provide a connecter for connecting an
electrically conductive casing element to an elec 30
trically conductive element having an opening,
and for insuring electrical continuity and con
tinuity of passage therebetween.
it is another and still further object of my in
vention to provide a connecter for connecting an 35
electrically conductive casing element to an elec
trically conductive element having an opening,
and for insuring electrical continuity and con
tinuity of passage therebetween, wherein 'the
juncture between the connecter parts and the 40
juncture between one end of the connecter and
the electrically conductive element adjacent the
the opening therein with a shielding conduit or - opening therein are maintained by direct and
by the joint which this connecter makes with the intimate metallic contact, the said junctures being
wall or partition of the junction box adjacent sealed against the exterior to thus preserve un
45 the opening or outlet therein, since both con
altered the resistance therethrough and to in
necter and joint fail to perform their primary sure electrical continuity from one electrically
function of providing electrical continuity be
conductive element to the other.
Other objects and many of the attendant ad 50
tween the junction box and shielding conduit.
vantages of this invention will be readily appre
In
the
prior
art
shielding
assemblies
the
joint
at
50
the opening‘ or outlet in the junction box is
formed by causing the sides of the junction box
to contact, respectively, with a ?ange at one end
of an externally threaded connecter body and
55 with a face of a nut in threaded engagement with
said body. Sole reliance for electrical continuity
at this'joint is placed upon the contact made by
the ?ange and nut with the sides of the junction _
box adjacent the opening therein. As it is gen
80 eral practice to paint junction boxes before in
ciated as the same becomes better understood
by reference to the following description when
considered in connection with the accompanying
drawing wherein:
Figure 1 is an assembled view in section of my
connecter and the joint which one end of the
connecter makes with a wall adjacent an open
ing therein;
Figures 2 and 3 are, respectively, a view in sec
55
:2
2,138,672
tion and a view in end elevation of the female
connecter part or member; and
Figures 4 and 5 are, respectively, a view in end
elevation and a view in section of the nut adapt
ed for threaded engagement with the female con
necter part.
My invention seeks to provide a connecter and
a joint between one end thereof and an electri
10
cally conductive element provided with an open
ing which are not only electrically continuous
but whose resistance is preserved substantially
unaltered. To accomplish the foregoing I main
tain a direct and intimate metallic contact be
15
20
tween the male and female connecter parts by
causing a wedging action between their contact
ing surfaces through the medium of a suitable
coupling means, the contact or juncture between
the connecter parts occurring within the con
?nes of a compressible ?uid impervious means to
thus effectively seal the juncture against the
connecter exterior. The joint is formed by pro
viding the female connecter part at one end
thereof with a plurality of projections which
are forced into contact with the electrically con
ductive element adjacent the opening therein,
the area of contact therebetween being sealed
against the joint exterior.
The joint and connecter of my invention are
30 intended primarily for use with the shielding of
aircraft ignition circuits and are so described in
their speci?c application hereinafter. It is to
be emphasized, however, that the joint and con
necter of my invention are not restricted to the
aforementioned
use but may be used wherever
35
and whenever an electrically continuous joint
and connecter are desired.
Turning now to the drawing there is shown in
Figure l in assembled relation a connecter iden
ti?ed in general by the numeral I for connecting
together the shielding conduit 2 and apertured
wall 3 of a junction box and for permitting the
passage of the ignition cable 4 from the conduit
into the junction box, the said connecter includ
ing a female connecter part 5, a male connecter
45 part 6, a deformable and compressible gasket 1
which serves as a fluid impervious sealing means
and is interposed between the connecter parts
and a coupling 8 for maintaining a direct and
intimate metallic contact between the connecter
parts and for causing the connecter parts to com
press the gasket ’! whereby to seal the surfaces
of contact between the connecter parts against
the connecter exterior.
i
The female and male connecter parts or bodies
55 5 and 6 are apertured at 9 and I 0, respectively,
to permit the passage of the ignition cable 4
from the shielding conduit 2 into the junction
box. In addition one end of the female con
necter part 5 is provided with a conical recessed
surface H with which a corresponding conical
connecter from adjacent the outermost edges of
the conical or inclined surfaces II and I2, these
bearing faces being adapted to abut against the
sides of the deformable, ?uid impervious gasket
‘l’ interposed therebetween to compress the same Cl
and thereby seal the surfaces of contact II and
i2 between the connecter parts or bodies 5 and
6 against the connecter exterior. The gasket 1
is preferably, although not necessarily, annular
in shape and is placed about and supported by 10
the cylindrical portion l5 of the male connecter
part 6. This gasket which serves as a sealing
means may be fabricated from synthetic rubber
or any other suitable material so long as the
material chosen is ?uid impervious, will with
stand the weather and be reasonably resistant
to ?uids such as, for example, gasoline, oil, and
Water.
In order to insure a direct and intimate me
tallic contact between the contacting surfaces II 20
and I2 of the connecter parts and a compression
of the gasket 1, the male and female connecter
parts have been provided with a ?ange l6 and
screw threads II, respectively, which are adapted
to engage a complemental ?ange l6’ and internal 25
screw threads ll’ of a coupling sleeve or nut I.
Portions N3 of the coupling sleeve or nut 8 are
hexagonally or otherwise shaped to permit the
use of a wrench for tightening purposes.
The
coupling sleeve or nut 8 in addition to holding 30
the contact surfaces H and I2 of the connecter
parts in intimate and direct metallic contact and
'
'
of the gasket 1,
35
connecter.
The male connecter part 6 is recessed or rab
beted at l9 to provide inner and outer walls 20 and
2!, respectively, between which the shielding con~
duit 2 is received. Since in this embodiment of
40
can be readily soldered, the male connecter part
is attached to its shielding conduit 2 of similar
material by sweating the outer wall 2| with solder
to the outside of the conduit. The inner wall 20
of the male connecter part 6 in this case serves
to support the inside of the shielding conduit 2
and to prevent sharp edges thereof from causing
damage to the ignition cable 4.
Where, however, the connecter parts are made
of an aluminum alloy or metal which cannot be
conveniently soldered to a shielding conduit of
similar material, I may employ an alternate mode 65
of connection which consists in swaging the
outer sleeve 2| inwardly around the shielding
surface I2 of the male connecter part 6 is adapted
to contact, to thereby insure electrical continuity
through the connecter. While the contactingsur
faces of the male and female connecter parts are
65 shown as conical in shape, I do not desire to be
restricted thereto since other inclined contact
surfaces may be employed within the purview
of my invention and‘ will readily suggest them
selves to those skilled in the art, hemispherical
70 surfaces and pyramidal surfaces being illustra
tive but not restrictive of such other inclined
surfaces.
The female and male connecter parts 5 and 6
are furthermore provided with bearing faces l3
75 and M, respectively, extending outwardly of the
engagement between the male connecter part and
the shielding conduit.
The threaded body portion of the female con
necter part 5 is provided at another end there
of with a plurality of circumferentially spaced
projections, or splines 22 and a ?ange 23, the
said projections being forced into the wall 3 of the
junction box adjacent the opening therein and
being in direct and intimate electrical contact
therewith. A ?uid impervious gasket 24 is inter 70
posed between the ?ange 23 and one side of the.
wall 3 of the junction box and a second gasket
25 placed adjacent the opening in the wall 3 and
on the other side thereof, these gaskets being
3
2,118,672
compressed and held in ?uid impervious engage
I claim:
ment with the sides of the wall 3 by means of
1. Means for connecting an electrically con
a nut 26. Both gaskets are fabricated in a man
ductive casing element' to an electrically con
ner similar to that of the gasket 1. The nut 26 .ductive element provided with an opening and
has a portion of the inner face cut away at 21 for insuring electrical continuity and continuity
to provide space for the projections or splines of passage therebetween, comprising in combina
and/or the metal they displace, while permitting
a tight fit between the inner face of the nut and
the ?uid impervious gasket 25 and the use of the
10 connecter regardless of the thickness of the wall
or partition 3 through which it passes. A tight
?t between the wall 3 of the junction box, on the
one hand, and the gaskets 24 and 25, the ?ange
23 and the nut 26, on the other hand, is essential
15 in order to effectively seal the area of contact
between the projections 22 and the junction box
wall 3 against the exterior and hence against the,
introduction of any extraneous'matter such as,
for example, oil and water. It is to be em
20 phasized, however, that the washers or gaskets
24 and 25 need not be employed since a joint
25
30
35
40
which is substantially and effectively sealed
against the exterior may be obtained by causing
the inner faces of the ?ange 23 and the nut 26
to intimately contact the faces of the wall 3.
In use the female connecter part is placed
through the opening in the wall 3 of the junction
box and the nut 26 threaded thereon and tight
ened with or without the interpositioning of
gaskets 24 and 25. The tightening of the nut
causes the projection 22 to cut into the wall 3 of
the junction box adjacent the opening therein
and thus to provide a direct and intimate elec
trical contact therewith. The tightening of the
nut 26 serves also to provide a substantially ?uid
impervious juncture between the wall 3, on the
one hand, and the ?ange 23 and nut 26, on the
other hand, to thereby seal the area of contact
between the wall 3 and the projections 22 against
the exterior and thereby insure electrical con
tinuity at this joint. The nut 8 is now assembled
over the male connecter part 6 and the ?uid im
pervious gasket ‘I placed about the cylindrical
portion l5 of the male connecter part.
The fe
45 male connecter part 5 is then brought into place
and the parts secured together by tightening the
coupling sleeve 8.
As the sleeve or nut 8 is tight
ened the conical projection on the male con
necting part is wedged into the corresponding
50 conical recess of the female connecting part thus
providing . direct electrical continuity through
the connecter. Simultaneously with the tight
ening of the nut or sleeve 8 the sides of the gasket
1 are compressed betwegi the bearing faces l3 and
55 ll of the connecter parts thus sealing within its
con?nes the surfaces of contact II and I2 of the
connecter parts against the introduction of ex
' traneous materials such as gasoline, oil
and
moisture.
60
According to the provisions of the patent stat
utes I have set forth the principle and mode of
operation of my invention and have illustrated
and described what I now consider to represent
its best embodiment. However, I desire to have
65 it understood that within the scope of the ap
pended claims the invention may be practiced
otherwise than as specifically illustrated andde
tion an apertured, electrically conductive body
provided with a plurality of spaced projections
at one end thereof and a bearing face and in
clined, recessed, contact surface at the other end 10
thereof, means for forcing the projections into
electrical contact with the electrically conductive
element adjacent the opening therein and for
sealing the area of contact therebetween against
the connecter exterior, a second apertured elec
trically conductive body adapted for connection
to said casing element and having a contact sur
face in electrical contact with that of said ?rst
mentioned body and a bearing face, deformable
means interposed between the bearing faces of 20
said bodies and adapted to be engaged thereby
for sealing the area of contact at the surfaces of
said bodies against the connecter exterior, and
means for holding said bodies in wedging engage
ment at their surfaces of contact and for caus
25
ing the bearing faces to abut against the de
formable means interposed therebetween.
2. An electrically continuous shielding assem
bly comprising in combination an electrically con
ductive casing element, an electrically conduc
tive element provided with an opening and means
for connecting said elements together and for in
suring electrical continuity and continuity of pas
sage therebetween, said means including an aper
tured, electrically conductive body provided with 35
projecting means at one end thereof and a con
tact surface at the other end thereof,‘ means for
forcing the projecting means into electrical con
tact with the electrically conductive element ad
jacent the opening therein and for sealing the 40
area of contact therebetween against the con
necter exterior, a second apertured electrically
conductive body electrically continuous with said
casing element and having a contact surface in
contact with that of said ?rst mentioned body, 45
means for sealing the area of contact between
said ?rst and second mentioned bodies against
the connecter exterior, and means for holding
said ?rst and second mentioned bodies in engage
ment.
50
3. Means for connecting an electrically con
ductive casing element to an electrically con
ductive element provided with an opening and for
insuring electrical continuity and continuity of
passage therebetween, comprising in combination 55
an apertured, electrically conductive body pro
vided with projecting means at one end thereof
and a contact surface at the other end thereof,
means for forcing the projecting means into elec
trical contact with the electrically conductive ele 60
ment adjacent the opening therein and for seal~=
ing the area of contact therebetween against the
connecter exterior, a second apertured electri
cally conductive body adapted for connection to
said casing element and having a contact sur
65
face in contact with that of said first mentioned
body, means for sealing the area of contact be
tween said ?rst and second mentioned bodies
This invention may be manufactured and used v against the connecter exterior, and means for
.70 by or for the Government of the United States holding said first and second mentioned bodies in 70
of America for governmental purposes without engagement.
scribed.
>
‘
payment of royalties thereon-or therefor.
.
THOMAS C. GREEN.
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