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Патент USA US2127928

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v Aug. 23, 1938.
T. E. MODOWELl.‘
PLUG AND RECEPTACLE
Filed May 24, 1957
3 She_ets-—Sheet 1
Aug. 23, 1938.~
2,127,928
'r. E.’ McpowELL.
PLUG AND RECEPTACLE-
Filed May 24,’ 1957
.
3 Sheets-Sheet 2
Aug. 23, 1938,
T, E, MCDOWELL
2,127,928
PLUG AND RECEPTACLE
Filed May 24, 1957
‘V
3 Sheets-Sheet 3
ZWMEUUH
Patented Aug. 23, 1938
2,127,928
UNITED STATES PATENT OFFICE
2,127,928
PLUG AND RECEPTAC‘LE
Thomas E. McDowell, Chicago, Ill., assignor‘to
The Pyle-National Company, Chicago, 111., a
corporation of New Jersey
Application May 24, 1937, Serial No. 144,452
.5
3 Claims. (01. 173-332)
The present invention relates to plug and re
Figure l is an elevational view of a separable
ceptacle construction, and more particularly to connector of the present invention with the two
improvements in electrical connectors and more parts in connected relationship.
particularly to two-part separable connectors of
Figure 2 is an enlarged, fragmental, axial sec-e
the plural contact type, wherein the parts are tional view through one part of the connector,
connected and disconnected by axial movement herein designated as the receptacle.
of the parts towards and away from each other.
Figure 3 is an enlarged, fragmental, axial sec
An object of the present invention is to pro
tional view through the other part of the connec
vide a two-part electrical connector wherein the tor of the present invention, herein designated
insulating bodies carrying the male and female as the plug.
contacts may be interchangeably assembled in the
Figure 4 is an end view of a receptacle of Fig
protective casings of the parts.
ure 2, looking at the right-hand end of Figure 2.
Another object of the invention is to provide a
Figure 5 is a transverse section taken substan
two~part electrical connector in which the in
tially in the plane indicated by line V-V of
sulating contact carrying bodies are formed each Figure 2.
of two members, with the bodies secured in place
Figure 6 is an exploded view showing a frag
in their protective casings by connecting means mental portion of a protective casing, and the
between the two members of a body.
members constituting the insulating bodies of
A further object of the present invention is to the present invention, the parts being in proper
provide a two-part electrical connector wherein position for assembly of the body members in
the insulating contact carrying bodies are fash
their protective casing.
ioned each of two members, and wherein the two
Figure 7 is a transverse sectional view taken
members of a body are clamped about a portion substantially in the plane indicated by line
of its casing to prevent separation of the casing
"
and body.
‘
A still further object of the present invention
is to form an insulating body for one part of a
two-part separable electrical connector, which
body consists of two members, one of which mem
.30 bers carries the contacts for said one part, and
the other of said members is restrained against
displacement with respect to its casing by making
shouldered engagement with said casing, and
securing said two members together within the
35 casing to clamp them to the shoulder to prevent
displacement.
The invention has for a further object the
provision of a two-part electrical connector con
struction wherein the insulating bodies of the
4.0 parts are clamped in place within their protective
casings by cooperating parts of the bodies and
casings.
The invention has for another object the pro
vision of a two-part electrical connector con
" struction wherein the insulating bodies for the
parts are held in place in their protective casings
by bolts which do not threadedly engage any part
of the casings. -
The above, other, and further objects of the
present invention will be apparent from the fol
lowing description and accompanying drawings.
The accompanying drawings illustrate a two
part separable electrical connector, constructed
in accordance with the principles of the present
55 invention, and the views thereof are as follows;
-.
10
15
20
VII-VII of Figure 2‘.
Figure 8 is an axial central view of one of the 25
protective casings of the illustrated form of the
present invention.
Figure 9 is an end view of the casing of Figure
8, looking at the right-hand end of said ?gure.
Figure 10 is a transverse sectional view taken 30
substantially in the plane indicated by the line
X—X of Figure 8.
‘
The drawings will now be explained.
The ‘two-part separable connector illustrated in
Figure 1 includes a receptacle A and a plug B.
35
The receptacle A has a protective casing I of
the general form and shape illustrated in Figures
8, 9, and 10 and is made of suitable material,
such for example as “Bakelite” or any other ma
terial suitable for the purpose.
The casings of both the receptacle A and the
plug B are similar in shape and form and are
adapted to interchangeably receive the insulating
bodies of the plug and receptacle.
Figure 8 illustrates the details of the illustrated 45
form of casing which is made of generally cylin
drical form in end elevation, having its rear por—
tion of reduced diameter with respect to the front
portion. The rear portion is ‘shown at the left in
Figure 8, and the front portion is shown at the .50
right in Figure 8.
The extremity of the reduced rear portion is
threaded at 2 and the entrance end to the rear
portion is preferably formed with a frustro
conical surface 3 against which the irustro
2
2,127,928
conical outer surface of a bushing 4 bears when
the parts are assembled. For retaining the bush
ing 4 in position, a strain relief nut 5 having
an end wall 6 in which there is the central
opening ‘I of less diameter than the internal
threads of’ the nut, is threaded on to the threaded
portion 2 of the casing and carries a washer 8
which bears against the bushing 4. When the
electrical cables G are passed into the ends of
10 the rear portions of the casings, and are suit
ably connected to the contacts carried by the
insulating bodies, and the body parts are assem
bled in operative relationship, the nuts 5 are
tightened to thereby compress the bushings 4
15 about the conductors to prevent withdrawal of
the cables, and serve as strain relief means for
the cables.
The casing l is formed with an internal an
nular shoulder 9, at substantially the junction
20 between the rear and front parts. A portion
of the surface of the interior of the casing is
cut away to form an arcuate recess ID the bot
tom or inner surface of which is spaced inwardly
from the shoulder 9. This recess I0 serves as
25 an arcuate slot in which a tail piece on the
inner member of the insulating body works, to
limit rotative movement of said inner body, as
will be hereinafter more fully explained.
The interior of the casing, at its front end is
30 fashioned to provide a plurality of inwardly di
rected axially extending tongues ll, l2, and i3.
Between the tongues, circumferentially of the
casing, are arcuately shaped grooves I4, I53, and
Is. As illustrated, the groove M is between the
35 tongues H and I2, the groove l5 between the
tongues l2 and I3, and the groove l6 between
the tongues 13 and H. The inner extremities of
the tongues ll, [2, and I3 stop short of the
annular shoulder 8, within the casing, a distance
40 but slightly greater than the axial thickness of
a part of an inner member of the insulating body.
The inner extremities of the several tongues,
constitute what are herein termed as shoulders
and are designated at I‘! in Figure 8.
4.5
illustrated in axial section in Figure 2, and in
isometric view in Figure 6.
Likewise the insulating body for the plug B
comprises two members, C and
the member
C being of the same construction for both the
receptacle A and the plug B.
The member C, herein termed the “inner”
member is of less axial length than either of
the outer members D or E of the insulating bodies.
Each of the inner members C is formed with 10
radially projecting tongues 69, 2t, and 25 which
are circumferentially spaced by axially extend~
ing grooves 22, 23, and 2d. The groove 22 is
between the tongues l9 and M, the groove 23 is
between the tongues 2D and 2!, and the groove 15
24 is between the tongues 2i and ill. The cir
cumferential extent of the tongue 2! of the inner
member C is fashioned to slide into the groove M
of the casing i. In like manner the tongue l9
of the member C ?ts the groove 56 of the casing, 20
and the tongue 20 fits the groove 85 of the
casing. The grooves 252, 23, and 24 of an inner
member C receives, respectively, tongues l3, l2,
and H of the casing when the inner member C
is assembled in its casing. Referring to Figure 6 25
of the drawings, the face of the inner member
C which. is readily observed, is for convenience
herein termed the outer face. The inner face
of each of the inner members C is provided with
an axially extending lug 25 which, when an inner 30
member is assembled in its casing, lies within
the recess iii of the casing. The relationship of
the lug 25 and the inner face of an inner mem
ber C, is such that when an inner member is
assembled in its easing by axial movement, the 35
lug will lie against the left-hand end of the
recess If), as viewed in Figure 10.
The outer face of each of the inner members
C is provided with outstanding collars 25. there
being as many of these collars 26 as there are
apertures 2'6’ through the inner members for
passage of conductors to the contact members
carried by the outer insulating member of a
body. Each of the insulating bodies C is pro
In order to prevent assembly of an insulating
body in its casing in any but the proper relative
vided with axially extending, circumferentially 45
spaced apertures 28 which are arranged between
angular relationship, the circumferential extent
the several collars 26 and conductor apertures
of the several grooves as well as the intervening
tongues, are different. As illustrated, the cir
cumferential extent of the grooves l5 and. I6
is the same, while the circumferential extent of
the groove I4 is greater than that of either of
the grooves I5 and 16. The circumferential ex
tent of the tongue I3 is greater than the cir
cumferential extent of either of the tongues H
and I2, the tongues H and I2 being of the same
circumferential extent.
If desired for ease of assembly of the insu
lating body members in their casing, one of the
tongues, such for example as the tongues l3
may be provided with an axially extending
notch l8.
When the tongues H are provided with axially
extending notches l8, the body members C and
65 D may be provided with projections 62 to inter?t
with said notches during assembly of these parts
in the shell.
Immediately in front of the annular shoulder
9
the interior of the front end of the casing is
70
cylindrical, with a diameter of that of the bases
of the several grooves l4, l5, and i5 formed in
the front end of the casing.
The insulating body for the receptacle A is
75 formed of two members C and D, which are
27 of the member C, for receiving attaching
bolts 29.
Preferably the insulating bodies C, D, and E 50
are made of moldable material, such for ex
ample as “Bakelite”, or other material of suit
able nature. At the time the members C are
molded, metallic inserts or bushings 3B are mold
ed with the members. The interiors of these 55
inserts 3?! are threaded to receive the threaded
ends 3| of the bolts 29. The rear face of each
of the members C is formed with circular pro
jections E32 formed as continuations of the aper
tures 23 of the member C, to serve as feet to 60
bottom against the shoulder 9 of the casing
when a member C is assembled, as may be readily
observed in Figures 2 and 3.
The relationship of the conductor apertures
21 in the inner member C, with respect to the 65
relationship of the apertures 32 of the outer
member D of the receptacle insulating body, is
such that when the inner and outer members
C and D, are aligned for assembly in a receptacle
casing l, as illustrated in Figure 6, the apertures 70
21 and 32 are out of axial alignment.
The inner members C are assembled in their
casings by applying these members to the front
ends of the casings, with the tongues and grooves
in inter?tting relation, and sliding the members 75
2,127,928
C inwardly until the same abut the shoulders 9
of the casings, thereupon the inner members C
are given rotative movement clockwise as viewed
in Figure 6, and counterclockwise as viewed in
Figure 5, until the lugs 25 abut the right-hand
extremities of the recesses H), as viewed in Figure
10, which movement brings the tongue 2| of an
inner member C under the‘ shoulder ll of a
tongue H of the casing, the tongue l9 of the
10 member C under the corresponding shoulder ll
of the tongue I3 of the casing, and the tongue 20
under the shoulder I‘! of the tongue I2 of‘ the
casing, thereby interlocking the inner members
in the casings against axial displacement.
15
The inner members C are rotated so that the
lugs 25 thereof rest against the right-hand ex
tremities of the recesses IU of the casings as
viewed in Figure 10, the conductor openings 21
are then in alignment with the openings 32 of
the outer members of the insulating bodies.
The member D, of the insulating body for re
ceptacle A is likewise formed of moldable mate
rial, such for example as “Bakelite”, and in gen
eral the surface contour is cylindrical. Formed
25 in the body D, when it is molded, are the contact
openings 32, which are angularly spaced and
which extend throughout the length of the mem—
ber D. In the outer surface of the inner end of
the outer member D are formed grooves 33, 34,
30 and 35 which, in circumferential extent, are
, adapted to receive the tongues I I, I3, and I2, re
spectively, of the casing l of the receptacle, as
may be observed in Figure 7. The several
grooves 33, 34, and 35 extend part way of the
35 length of the outer member D, terminating in
circumferential shoulders 36 which, when the
outer member D is assembled in its casing, abut
the outer ends of the tongues ll, l2, and I3 of
the casing I, thereby limiting the assembled or
40 inward position of the outer member D in the
casing.
-
The inner face of the outer member D is
shaped to conform with the outer surface of the
inner members C, to receive the collars 26 sur
45 rounding the conductor apertures 21 of the
member C.
The shape and arrangement of one of the con
tact receiving openings 8 is shown‘ in section in
Figure 2.
50
An opening H is bored from the inner end of
the member D, i. e., left hand as shown in‘ the
?gure, with a series of axially spaced bores 38, 39
and 32, respectively of decreasing diameters in
the order shown.
55
‘
The largest bore 38 receives a collar 26 of the
inner member C, when the members are assem
bled, the intermediate bore 39 receives the en
larged end or head 63 of a female contact F,
while spring ?ngers 44 of the contact lie within
the bore 32, which is of greater axial length than
either of the bores 38 or 39. There is an en
trance 3‘! to an opening H, for a male contact,
which opening is bored through an end wall 43
at the outer end of the member D.
Formed in the insulating member D and dis
65
posed between the opening 32 of the member, are
apertures 40 for the attaching bolts 29. The
apertures 48] extend axially of the member D.
The outer face of the member D is counter
70 bored at 4! to receive the heads 42 of the several
bolts 29 and immediately adjacent the counter
bores M the body D is apertured and threaded
at 64 to engage the threaded ends of the bolts
when the bolts are ?rst applied to the member
75 D. Inwardly of the threaded portion 64 the body
3
is bored to provide elongated bolt holes of suffi
cient diameter to slidingly receive the threaded
ends of the bolts 29 ‘and permit easy movement
of the bolts lengthwise of the member D. The
purpose of the threaded portions 64 is to prevent .3
loss of the bolts 29 from the member D, when
this member is disconnected from the inner body
member C. In other words, the bolts 29, when
the member D is disconnected from its member
C, may slide back and forth in the apertures 43
but cannot fall out of the member because of
the fact that the threaded portion of the bolts
must be unscrewed through the threaded por
tions 64 of the member D before the bolts can
be removed. ‘
Within the contact openings H of the member
D of the receptacle insulating body, are female
contact members, designated generally as F.
These contact members F are inserted in the
body member D through the inner end of such
member, that is to say, from left to right, as
viewed in Figure 2.
Every one of the female contacts F is provided
with split'sleeve portion 44, the outer extremities
of which terminate inwardly of the wall 43 de?n- I 25
ing the entrance opening 31.
The inner por
tions or heads 63 of the contacts F are, exte
riorly, fashioned to ?t within the bores 39 and 32
of the contact openings or apertures H, and pref
erably with extremities 45 which enter slight dis 1-30
tances into the collars 26 of the inner member C.
The inner ends or heads of the contacts F are
counterbored at 43 and into these counterbores
are inserted‘the ends ill of the individual con
ductors G. The conductors G’ of cable are pref
erably soldered to the contacts F, thus assuring
integral connection and proper electrical connec
tion as well.
‘
The outer face of the member D is provided
with channels 48 which communicate one with
another substantially centrally of the member D,
and extends radially outwardly to the counter
bores 40 for the bolt heads 42. The purpose of
the channels 48 is to prevent such an accumu
lation of carbon particles, due to arcing, when
vthe parts of the connector are separated, as
would otherwise short-circuit the receptacle in
sulating body between any two of its contacts F.
The‘channels 4B are deep enough, axially of the
member D, to prevent carbonization of materials $50
such as “Bakelite”, created by arcing to prevent
short-circuiting, for substantially the life of the
member D.
s
'
'
Figure 4 shows the position of the channels 48
with respect to the contact apertures of the mem
ber D.
In wiring the receptacle A, the bodies C and D
are removed from the casing, the conductor cable
is inserted through the rear end of the casing,
and the individual‘ wires of the conductor sev (50
erally‘ applied to the counterbores 46 of the
female contact members F, with these contacts
removed from the outer member D. Before the
conductors are attached to the contacts F, the
wires thereof are passed through the conductor
apertures 21 of the member C, which is out of
the casing l, during such wiring assembly, and
then the contacts F are soldered to the extremi
ties of the conductors and the contacts F are in~
serted in the openings H of the member D. Mem 70
ber C is then moved along conductors to butt
against end of contacts, whereupon the inner
body member C is assembled in its casing I by
engaging its tongues and grooves with the grooves
and tongues, respectively, of the casing, moving is
2,127,928
the inner member C inwardly until it rests
against the shoulder 9, whereupon the member
C with contacts is given rotative movement so
that its tongues lie under the shoulders ll of
the tongues ll, I2, and I3 of the casing I. The
member D, is then applied over contacts F by
sliding the contacts into the several apertures
32, from the inner end of the body D, as viewed
in Figure 2. The outer body member D is then
10 assembled into the casing by sliding it with its
tongues entering the grooves l4, l6, and I5 of
the casing, and its grooves 33, 34, and 35 receiv
ing the tongues l I, I3, and I2, respectively, of the
casing, thus properly aligning the outer mem
15 ber D in the casing. The inner member D is
moved into its casing I until the shoulders 36
of its grooves abut the outer extremities of the
tongues of the casing, whereupon the bolts 29
are threaded into the bushings 30 of the inner
20 member D and tightened to hold the members C
and D together.
By reason of the fact that portions of the inner
member C abut the shoulder I‘! or inner ends of
the tongues of the casing and the shoulders 36
25 of the outer member D abut the outer extremi
ties of the tongues of the casing, then when the
bolts are tightened, the inner and outer insu
lating body members are clamped against the
ends of the tongues, thereby interlocking the in
30 sulating body in its casing against endwise dis
placement.
By reason of the fact that the tongues and
grooves of the outer member D are in engage
ment with the corresponding grooves and tongues
35 of the casing, rotative movement of the outer
member with respect to the casing is prevented.
Because of the fact that the inner member C is
bolted to the outer member D, rotative movement
of the inner member is thus prevented so that
the insulating body of the receptacle is thus se
curely interlocked in its casing against axial dis
placement as well as against rotative displace
ment with respect to the casing, all without any
bolts engaging any part of the casing, thereby
45 eliminating need for precision manufacture of
the casing in that respect.
Referring now to Figure 3, the outer member E
of the plug insulating body has an outer cylin
drical surface conforming substantially to the
outer diameter of the front end of its casing. The
50
member E is hollow, having a diameter to tele
scopically receive so much of the outer member
D of the receptacle insulating body as projects
beyond the front end of its casing.
The inner portion E’ of the outer body member
55
E of the plug, is adapted to rest against the in
ner member C of the plug insulating body and
its inner face is shaped and fashioned to re
ceive the collars 26 of its inner member C, as
60 may be observed in Figure 3.
The member E is apertured at 49 to receive
pin contacts 50, 5 I. There are, of course, as many
pin contacts in the plug as there are female con
tacts F in the receptacle.
Inwardly of the apertures 49 for the pin con
65
tacts the body member E is enlarged at 52 to re
ceive enlarged portions 53 of the pin or male con
tacts and thus prevent displacement of the male
contacts when the parts of the connector are
70
separated.
Arranged between the apertures 49 for the
male contacts 50, 5|, the inner portion of the
member E is provided with axially extending
apertures 6| for attaching bolts 54. The mem
75 ber E is counterbored at 55 to receive the heads
56 of the bolts and to permit these heads to lie
inwardly of the adjacent portions of the hollow
part of the member E, to prevent possibility of
short circuiting. Inwardly of the bores 55 the
‘member E is threaded at 51, for a short distance,
with the balance of the apertures 6| of greater
diameter, so that the bolts 54 may slide freely
within the apertures, when disconnected from
the threaded bushings 30 of the member C.
The bolts 54 of the plug part function in the v10
same manner as the bolts 29 of the receptacle
part, as heretofore described.
The members C and E, of the plug part, are
assembled as follows:
To attach the conductors to the male con
15
tacts 50 and 5|, the bolts 54 are disconnected
from the inner member C, the outer member E is
withdrawn from its casing, the inner member is
then rotated sufficiently to be withdrawn from
the casing, whereupon the conductor cable G is 20
then inserted thru the rear end of the casing l
of the plug B, with the strain relief nut 5, of
course, released, and the wires of the conductor
cable passed through the apertures 21 in the
member C, and soldered to the enlarged portions 25
53 of the male contacts 50, 5|, which contacts
are removed from the outer member E, for the
purpose of soldering. After the wires are soldered
to the male contacts, the inner member C is
moved into its casing I, and given rotative move 30
ment to interlock it under the shoulders H of the
tongues of its casing in the same manner as de
scribed with reference to the inner member C of
the receptacle.
The male contacts are then inserted in the 35
member E and the member slid into the casing
B until the shoulder 58 abuts the member E,
whereupon the bolts 54 are screwed into the
bushings 30 of the member C thus securing the
members C and E in ?xed relationship in the 40
casing.
The outer surface of the inner end E’ of the
member E is fashioned with the grooves corre
sponding to the tongues II, I2, and iii of the
casing, so as to interfit therewith in the same 45
manner as the outer member D of the receptacle
insulating body ?ts its casing. The grooves of
the member E terminate in circumferentially ex
tending shoulders 58 which rest against the
outer ends of the tongues ll, l3, and I2 of the 50
casing, when the outer member E is assembled.
Thus when the members C and E are assem
bled in their casing, and the bolts 54 threaded
into the bushings 30 of the member C, the mem
bers D and E are clamped against the ends of the
tongues ll, [2, and I3 of their casing, to thereby
prevent axial displacement of the insulating body
with respect to its casing. Because of the fact
that the grooves 33, 34, and 35 of the member E
interlock with the tongues of the casing l, the 60
insulating body is prevented from rotative move
ment with respect to the casing.
In order to assure connection of the plug B
and the receptacle A, in proper polarity, the
outer surface of the member D may be provided
with a longitudinally extending groove 59 and
the interior surface of the hollow portion of the
member E with an axially extending ridge 6!!
which enters the groove 59 when the parts are
connected.
70
When the parts A and B are connected, as
shown in Figure 1, that portion of the member
D of the receptacle lies within the hollow por
tion of the member E of the plug, in telescoping
engagement, with the male contacts 55 and 5| 75
- 2,127,928
entered in the female contacts F to thereby es
tablish electrical connection of the circuit in
which such a connector is installed.
The male contacts 5i? and 5! are of known
construction, that is split, to act with spring ac
tion when moved into the female contacts F. The
splitting of the female contacts F causes the split
portions to give slightly when the parts are con
nected, to thereby assure full electrical connec—
tion between the contacts F and the contacts 50
and H of the plug.
In order to aid in connection and disconnec
tion of .the parts A and B, the outer surfaces of
the nuts 5 may be knurled.
15
The construction of the various parts permits
interchange of male and female connections in
either housing.
When the plug and receptacle parts A and B
are connected, the outer surface thereof is con
20 tinuous, contains no projections to catch when
the connector is dragged over a rough surface,
and the frictional engagement between the con
tact is su?icient to hold the parts together against
any but abnormal endwise pull.
25
By reason of the fact that the circumferential
dimensions of the tongues of the casing and the
corresponding grooves of the mating insulating
body member, are different, it is impossible to
assemble the insulating body members in a cas
30 ing, in any but proper angular relationship.
The invention has been described herein more
or less precisely as to details, yet it is to be
understood that the invention is not to be lim
ited thereby, as changes may be made in the ar
35 rangement and proportion of parts, and equiva
lents may be substituted, without departing from
the spirit and scope of the invention.
The invention is claimed as follows:
1. In an electric coupling of the class de
40 scribed; a shell; two separable insulating body
members in said shell carrying a plurality of elec
tric contacts; one or the inner of said body
members being axially and then rotatably assem—
bled in the shell; said shell and member having
45 cooperating tongue and groove means for guid
ing the member axially and preventing rotative
movement of said member until seated in said
shell; said shell having an internal seat for said
member; said shell and member having cooper
ating means for limiting rotative movement of
said member when seated; the other or outer of
said members being axially assembled in said
shell; said shell and said outer member having
cooperating tongue and groove means for guid
ing it and preventing relative rotation between
it and said shell; said inner member having
threaded bushings for receiving securing bolts;
securing bolts in the outer of said members; said
bushings and bolts being aligned when said inner
60 member is rotated to its limit in one direction;
said shell having means constituting a shoulder
engageable by said inner member when rotated
to its limit in said one direction to prevent
axial movement of the inner member away from
65 its seat, the construction being such that when
said members are connected together by said
bolts axial displacement of the connected mem
bers is prevented by engagement of the inner
member with said shoulder and rotative move
70 ment of the connected members is prevented by
the tongue and groove guide means of said shell
and said outer body member.
‘
‘2. A separable electric connector part com
5
prising a shell open at one end, an insulating body
within said shell carrying a plurality of electrical
contacts, said body consisting of two separable
members arranged in tandem in said shell and
applicable to and removable from said shell
through said open end, said shell having an an~
nular internal seat spaced inwardly from said
open end, the inner of said members being as
sembled in said shell against said seat and ro
tated a limited amount, said shell and member
having cooperating means to limit rotative move
ment of said member, said inner member having
threaded bushings for receiving securing bolts,
the outer of said members being assembled by
axial movement of said member into said shell
and against said inner member, said outer mem
ber carrying securing bolts for engagement with
said bushings when said inner member is seated
and rotated to its limit in said direction, said
outer member and shell having cooperating=
tongue and groove means for preventing relative
rotative movement of said member and shell, the
inner ends of said tongues stopping short of said
seat to provide stop means for said inner member
when seated and rotated to prevent axial move
ment of said inner member, the construction be—
ing such that when said two members are con
nected by said bolts axial displacement is pre—
vented by engagement of said inner member
against the inner ends of said tongues and rota
tive movement of the two connected members in
the shell is prevented by the tongue and groove
engagement of said outer member and said shell.
3. A separable electric connector part com
prising a shell open at one end, an insulating ,
body within said shell carrying a plurality of elec
trical contacts, said body consisting of two sepa
rable members arranged in tandem in said shell
and which members may be applied to and re
moved from said shell through said open end, said 40
shell having an annular internal seat spaced in
wardly from said open end, the inner of said
members being assembled in said shell against
said seat and rotated a limited amount, said shell
and member having cooperating means to limit 45
rotative movement of said member, said inner
member having threaded bushings for receiving
securing bolts, the outer of said members being
assembled by axial movement of said member into
said shell and against said inner member, said 50
outer member carrying securing bolts for en
gagement with said bushings when said inner
member is seated and rotated to its limit in said
direction, said outer member and shell having co
operating tongue and groove means for prevent
ing relative rotative. movement of said member
and said shell, the inner ends of said tongues
stopping short of said seat to provide stop means
for said inner member when. seated and rotated
to prevent axial movement of said inner member,
and said outer member having stop means en
gageable with the outer ends of said tongues to
limit inward movement of said outer member, the
construction being such that when said two mem
bers are connected by said bolts axial displace 65
ment is prevented by engagement of said con
nected members against the ends of said tongues
and rotative movement of the two connected
members in the shell is prevented by the tongue
and groove engagement of said outer member and
70
said shell.
THOMAS E. MCDOWELL.
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