June 27, 1967
‘
P.'H. WINTER‘
3,328,748
DEAD‘FRONT CONNECTOR CAP OR CORD CONNECTOR
WITH INTEGRALLY MOLDED CORD‘GRIP
Filed July 20, 1964
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iNVENTOR
PAULv'I-I. WINTER
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BREW/7% “1WWW
ATTORNEYS
June 27, 1967
P. H. WINTER
3,328,748
DEAD-FRONT CONNECTOR CAP OR CORD CONNECTOR
WITH INTEGRALL-Y MOLDED CORD GRIP
Filed July 20, 1964
4 Sheets-Sheet 2
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INVENTOR
PAUL ‘H, WINTER
' ,. 5Y5. , Elev‘ Mfg“ (4221“ m z '
ATTORNEYS
June 27, 1967
,
-
P. H. WINTER
'
3,328,748
DEAD-FRONT CONNECTOR CAP OR CORD CONNECTOR
Filed July 20, 1964
WITH INTEGRALLY MOLDED com) GRIP
_ 4 Sheets-Sheet 4
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PAUL H. WINTER
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Arr RNEYS
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United States Patent 0 "ice
Patented June 27, 1967
1
2
3 32s 74s
enlarged scale taken on line 4——4 of FIGURE 3 showing
one of the main blades and its terminal plate in elevation;
FIGURE 5 is a perspective view of one of the main
.
DEAD-FRONT CONNECTOR CAP 0R CORD CON
NECTOR WITH INTEGRALLY MOLDED CORD
GRIP
Paul H. Winter, Syracuse, N.Y., assignor to Pass &
Seymour, Inc., Syracuse, N.Y., a corporation of New
York
3,328,748v
.
Filed July 20, 1964, Ser. No. 383,617
2 Claims. (Cl. 339—107)
blade units;
FIGURE 6 is a fragmentary sectional view similar to
FIGURE 4 but taken at right angles thereto and of a
second embodiment;
FIGURE 7 is a perspective view, similar to FIGURE 5,
of a contact and terminal unit for the cord connector of
_
10 FIGURE 6;
FIGURE 8 is a similar perspective view of an attach
This invention relates to connector caps of the types
ment plug contact blade and terminal unit which may be
called attachment plugs or cord connectors, and more
substituted for the corresponding unit shown in FIGURE
particularly to such caps having a dead front to protect
4 without requiring position maintaining by the cover or
and insulate the cord terminals and eliminate the chances
of short circuits and shocks. The invention features a cord 15 back plate;
FIGURE 9 is a side elevation of a slightly modi?ed
or cable grip molded integrally with the insulating mate
' dead-front connector cap with integrally molded cord
rial of the cap back plate.
» grip;
It is a general object of the present invention to pro
FIGURE 10 is a view similar to FIGURE 9 but dis
vide a novel connector cap having a dead front derived
from a two-piece body having a contact and prong 20 placed by an angle of 90 degrees from that showing;
FIGURE 11 is a top plan view of the device of FIG
carrying ‘bottom body, and a cover or back. plate provid
ing an integral cord or cable grip.
More particularly, it is an object of the present inven—
tion to provide a connector cap having a two-part body
URE 9;
FIGURE 12 is a bottom plan view of the top body
portion of the device of FIGURE 9;
of molded insulation, the bottom being cup-like and sup 25 FIGURE 13 is a cross-sectional view of the top body
portion taken along line 13——13 of FIGURE 11;
porting either housed cord connector contacts or attach
FIGURE 14 is a top plan view of the bottom body
ment prongs which extend through holes in the bottom
portion with the cover disc in place and partly broken
of the cup, each contact or prong having a terminal plate
away;
seated in the cup to receive a conductor of a cord, the
FIGURE 15 is a cross-sectional view taken along line
top body which is the cover or back plate at least partially 30
nesting in the bottom, being attached thereto and having
15—15 of FIGURE 14;
formed integrally therewith a cord or cable grip arranged
FIGURE 16 is an isometric view of a contact and
to clamp the conductors extending through the back
terminal unit for use in the embodiment of FIGURE 9;
plate to relieve strain on the terminals, etc.
'
FIGURE 17 is a contact and terminal unit for use in
.
Another object of the invention consists in providing 35 the female embodiment of FIGURE 9;
FIGURE 18 is a vertical cross-sectional view illustrat
the cover or back plate which is perforated for conduc
tor cord passage, with an integral cord-grip device com
prising a pair of arcuate clamp members each having
lateral wings through which screws are passed 'to pull the
ing the bottom body adapted to be provided with the con
tact of FIGURE 17;
FIGURE 19 is a cross-sectional view of the device of
clamp members tightly together against a cord extending 40 FIGURE 9 illustrating the manner in which the contact
of FIGURE 16 is mounted therein and the top and
through the passage, each clamp member and its wings
being spaced above the outer surface of the cover and
integrated therewith ‘by ?exible connecting members.
Still another object of the invention consists in form
ing the combined back plate and cord grip by molding
from a plastic having both rigidity and limited ?exibility
whereby changes in thickness of sections will provide
the various requirements for proper strength and mobility.
bottom bodies are secured together; and
FIGURE 20‘is a cross-sectional view similar to FIG
URE 19 illustrating the mounting of the contact of FIG
URE 17 in the bottom body and the manner in which
the top and bottom bodies are secured together.
Connector caps, often referred to as attachment plugs,
and cOrd connectors, have been manufactured in many
styles, shapes and materials, but those designed for rela
'- In one embodiment of the invention each terminal plate
has an upstanding strut positioned to be engaged by the 60 tively heavy-duty in combination with substantial-sized
cover or back plate to hold the prong terminal plate
securely in the body of the cap.
'
-
‘
'Other and further objects and features of the invention‘
will ‘be-more apparent to those skilled in the art upon a
conductor cords or cables (rather than the more or less
inferior integral parts of small portable electrical appli
ance cords provided with toasters, household equipment
and the like) are normally ?tted with substantial termi
consideration of the ‘following speci?cation and ofthe 55 nals for the attachment of the conductors of an electric
accompanying drawings wherein are disclosed several
exemplaryembodiments of the invention, with the under
standing that such changes and modi?cations may be
cord or cable. In most instances these terminals constitute
screws or the like, and are more or less exposed on the
forward face of the cap which is customarily made of
one piece of insulation hollow on the forward face, from
made therein as fall within the scope of the appended
claims without departing from the spirit of the ‘invention. 60 which the blades project, and there house the terminals.
These terminals and the bared sections of conductors are
In said drawings:
’
'
sometimes covered with a sheet of vulcanized ?ber, but
FIGURE 1 is a side elevation of a dead-front con
since the attachment is only by a friction ?t of slots
nector cap with integrally molded cord grip constructed
therein over the prongs of blades of the plug it is readily
in accordance with one embodiment of'the present inven
lost, and as a matter of fact, is oftentimes not reas
65
tion and illustrating a conductor cord securedrto a ground
sembled by the person who wires the cap. Caps wired with
ing-prong type of cap;
'
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7
stranded conductors, in particular, are subject to short cir
FIGURE 2 is a view similar to FIGURE 1 but dis
cuiting after some usage because all of the strands do
placed by an‘angle of 90 degrees from that showing; '
not necessarily remain ?rmly beneath the clamping
FIGURE 3 is a top plan viewthereof in the absence of 70 screws. In any event, the conductors may become dis
arranged and short circuits occur, which are dangerous
= FIGURE 4 is a partial central vertical section on an
from a ?re standpoint. Moreover, it is sometimes difficult
a
cord;
7
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3,328,748
4
to provide a rigid attachment for blade-s and prongs in this
type of cap at a reasonable cost. The present invention,
therefore, proposes to make the caps and connectors in
two pieces, secured together by appropriate fastening
means, one comprising a forward or bottom body section
through slots in which the blades and prongs extend with
a frictional ?t. These blades have integral terminal plates,
receiving attaching screws which are housed in a cup-like
hollow in the rear of the bottom body and are then
to enter a short distance into the recess in the bottom
body. A peripheral rabbet provides an area 30 which rests
on the top narrow edge of the bottom body 10 as clearly
seen in FIGURE 4. This arrangement holds the two parts
against lateral movement and secures proper alignment
for the fastening screws 32, FIGURES 1 and 3, the heads
of which are countersunk in the part 28 as seen in dotted
lines in FIGURE 1 and the shanks of which pass through
close-?tting openings in the bottom body and are re
covered by a back or cover plate which has an alignment 10 ceived in countersunk metal insets 34 which are non
circular and internally threaded to receive the threads of
the screws to hold the parts rigidly assembled.
Each of the terminal plates for the several blades and
yet ?exibility so that there may be formed integrally with
prongs may be ?tted with one of the struts 26 which
it an insulating cable clamp which serves to take the
strain from the conductors and their attachment to the 15 is of such a height that it is tightly engaged by the
underface 29 on the back plate, as clearly seen in FIG
plug blades when strain is put on the cable for one reason
URE 4, to press the terminal plate against the base 22
or another. Among these reasons is the fact that so often
of its recess in the bottom body and thereby hold it
careless persons withdraw a plug from the receptacle or
rigidly in position. The blades and prongs are pressed
the like by a yank on the cord, which, in the absence
into close-?tting openings through the bottom body as
of a cable clamp or grip transfers the stress to the conduc
earlier mentioned, but to insure against their sliding in
tors and the terminal screws.
wardly when inserted into a receptacle, engagement with
By making the cable clamp or insulating parts, addi
the ‘back plate, just discussed, is relied on and assures
tional danger of possible short circuiting is obviated.
a tight rigid mounting at all times even after major
The usual cable clamps are made of metal and the sec
tions thereof tightly drawn together by screws so that 25 strenuous use.
To provide a cable clamp for holding the conductor
eventually the cover of the cable can be chafed and the
cord or the like, rigidly and to relieve the terminals and
conductors short-circuited by the metal clamp elements.
individual conductors of strain, it is preferred to form
All of this is obviated by the present arrangement, and in
portion nesting in the cup of the body. This back plate
can be made of a material having su?icient rigidity and
addition, no loose parts which can be lost are used.
Referring now to the drawings for a better understand
ing of the invention, and ?rst to FIGURES 1 to 5, in
clusive, there is shown at 9 a dead-front connector cap
with cable grip in accordance with the ?rst embodiment
of the present invention. It includes at 10 the bottom body
portion of suitable insulation and which is preferably of
circular or disc-like con?guration, having a ?at bottom
11 and a circular side wall 12. This may be molded as
shown and has adequate mechanical strength as well as
it integral with the back plate 28, and this is done by
molding. Nylon is ideal for the purpose because of its
limited ?exibility in relatively thin sections. FIGURE 4
shows the cord central opening 35, adjacent which are
‘molded .the integral, ?exible, extensions 36 projecting
upwardly as continuations of the walls of opening 35,
35 which, however, are of less than 90 degrees in extent.
A substantial distance above the top surface of cover 28,
these extensions have relatively ?at upper ends or tops
37. Each is substantially thickened in a radial direction
insulating characteristics for its intended use.
a distance downwardly from the top to provide added
The plug shown, by way of illustration, is of conven 40 rigidity over the ?exibility afforded by the thinness at 36.
tional style having a pair of parallel blades 14 and a
There are thus provided two wings or curved clamp mem
longer grounding prong 15 of generally U-shaped cross
bers 40 which can be drawn toward each other to engage
section, as is now conventional, but the arrangement and
the insulating cover of the cable or conductor cord and
number of the blades and prongs can be varied to suit
clamp the same as is clearly illustrated in FIGURE 3
conditions and their style and number form no part of 45 as well as in FIGURES 1 and 2.
the present invention.
To provide clamping facilities, each of the clamp mem
One of the plug blades 14 is shown in its complete
bers 40' is ?tted with -a pair of wings 41, each extending
form in FIGURE 5 where it will be seen that in addition
laterally from one of its side edges, as seen on the right
to the elongated straight, ?at, blade portion it has at
in FIGURE ‘3, and at 42 on the left. These are so ar
right angles thereto a ?at terminal section 17 which is 50 ranged that corresponding wings 41 and 42 are parallel
perforated at 18 and threaded to receive a terminal screw
19 as seen in FIGURE 4. Such a blade unit is mounted in
to and confront each other to receive a clamping or
tightening screw 43 which passes through ‘an aperture in
the bottom body 10 by passing the elongated blade 14
through an axially disposed slot 20 in the "bottom wall
wing 41 closely receiving the shank thereof. Each screw
has a hemispherical head 44 thereon engaging the outer
thereof and permitting the terminal plate 17 to rest on the 55 face of wing 41. The wings 42, however, are treated dif—
bottom 22 of an individual close-?tting recess in the floor
ferently for their apertures are arranged to accommodate
of the main depression in the rear of body 10. An exten
hollow tubes 46 internally threaded to be engaged by
sion 24 of each such individual recess is provided to give
the threads on the screws. Each of these tubes is integral
adequate clearance for the shank of each terminal screw
with a square head 47, best seen in FIGURE 2, which
19, beneath the head 25 of which the conductors are 60 is received in a countersunk opening of the same con
twisted and clamped in the usual manner.
?guration in the outer face of wing 42 to hold it against
Referring to FIGURE 5 it will be seen that a lug or
rotation. The opposite end of the relatively thin threaded
strut 26 is turned upwardly at right angles to the termi
sleeve is spun over as seen at 50 in FIGURES 1 and 3
nal plate and parallel to the axis of the blade 14 and
to hold this combination tube and nut in position and in
closely adjacent thereto.
65 sure against its being lost. Since the screws are su?‘iciently
To cover, mechanically protect and electrically insulate
long to permit the parts 40 to be spaced at least as wide
the terminals and the bare portions of the conductors
as the walls of the bore 35, the ends of the screws can be
where the insulation has been removed for making con
upset to prevent them from being withdrawn and lost.
nections by clamping beneath the screw heads, a back
The relative thickness of the ‘parts 40 and their lateral
plate or cover 28 is provided preferably of the same diam 70 wings 41 and 42 is such as to give them su?icient rigidity
eter or other outer con?guration as the portion 10, but
in spite of the limited ?exible nature of the nylon plas
substantially thinner axially, as seen in FIGURES l and
tic, which permits bending so that the parts 40 may be
drawn toward each other to accommodate a cable or
2. For reasons which will appear later this portion is
smaller diameter than the aperture in the cap. If it is
preferably molded from nylon plastic, has a projection,
with a ?at forward face 29 reduced slightly in diameter 75 considered necessary, circumferential ridges or grooves,
3,328,748
5
not shown, may be formed on the inner faces of the
6
.
parts 40 to insure better grip on the cable sheath but in
another embodiment of this invention comprising a top
body 100 and a bottom body 102. The bottom body has
most cases will not be necessary since such sheaths are of
a ?at bottom 104 and a circular side wall 106. As in the
rubber or plastic and the parts 40 will be suitably em
other embodiments, it may 'be molded provided proper
mechanical strength ‘and insulating qualities are obtained
bedded therein when the screws are tightened.
This integral cable clamp is simple to manufacture,
requires no assembly and is equally as effective as a multi
part metal one without the short circuiting possibilities
thereby.
The plug, as in the other embodiment illustrated in
FIGURES 1—5, is conventional having a pair of parallel
of the latter.
In the second embodiment of the invention, illustrated
in FIGURES 6 to 8, the contact units are secured in the
blades 108 and ‘a somewhat longer ‘grounding prong ‘110'.
‘One of the plug blades 108 is shown in its complete
form in FIGURE 16 where it will be noted that in addi
tion to the elongated straight ?at blade portion 112, it
bottom body part independently of any engagement by
has at right angles thereto a flat portion 114 terminating
or assistance from the back plate. This construction makes
in a vertically extending bifurcated screw~carrying por
it feasible to form the back plate, and its integral cord
grip, of a more universal type suitable for attachment 15 tion 116 forming a U-shaped slot 118 between the bifur
cations 120—120 with the open portion upward. It will
plugs and cord connectors having various numbers
be noted that the bifurcations 120‘—-120 each extend out
and arrangements of blades, contacts and/0r grounding
beyond the vertical blade portion 112. The lower hori
prongs.
zontal face 122 of each bifurcationacts .as a bearing
Referring now to FIGURES 6 and 7 the assembly of
body insulating parts includes the main or bottom part 20 surface when the plug blade is positioned in the bottom
body 106.
.
60 corresponding generally to the cup 10 of the ?rst em
Plug blade 108v is mounted in bottom body 106 by
bodiment and a cover and cord grip unit 28 identical to
passing the elongated blade portion 112 down through
that bearing the same number in FIGURE 4 and similar
cavity 124 and out small aperture 126 in the bottom por
ly inter?tted and secured together as seen at 30.
Since FIGURE 6 depicts a cord connector, the main 25 tion of the bottom body. The vblade 108 is held in this
position as illustrated in FIGURE 19 by means of slots
body is somewhat deeper to house and insulate the full
128 and 130 (FIGURE 14), having shoulders which sup
lengths of the blade-receiving twin contacts 73, 74, seen
port the lower faces 122-122 of bifurcations 120—120.
in FIGURE 7, depending from the plate 70 formed in
Referring to FIGURE 19, the cavity 124 is somewhat
tegral with terminal plate 71, perforated and threaded
at 72 to receive the terminal or clamping screw having 30 enlarged at its top portion to accommodate and form a
the head 25.
'
The upper or rear portion of bottom body 60 is re
support for the threaded end 134 of screw 136 which is
horizontally disposed in the slot 118 of plug blade 108
cessed similar to body 10, has the ?at bottom wall 62
to support the contact-terminal units 70, 71, and clear
with its head portion outward of the bifurcations and the
or both contact springs 73, 74 of a unit has the edges of
its upper, straight portion serrated or toothed as shown
is adapted to grip a conductor passed downwardly
through aligned aperture 140 in body cover disk 142.
threaded portion extending across cavity 124. A wire-grip:
ance holes 64 for the screw shanks. Either one (as shown) 35 ping nut 138 is threadedly carried on the screw 136 and
Access to screw 136 is provided by an opening 144 in
the side wall 106 of the bottom body 102. There such
ly bury themselves in the walls of the plastic material of 40 plug blade arrangements are provided in the bottom body
102, two of the blade type 108 ‘and one of the grounding
the passage 66, through the bottom body 60, when pressed
blade type 110.
therein preferably before the plastic material has entirely
It will be noted that the cover disk 142 as shown, ?rst
cooled after being molded. This arrangement provides
in FIGURE. 15 and then in FIGURE 19, is held down in
adequately for securing the contact-terminal units in the
insulating material of the bottom body 60 so that struts 45 position by expanding the top portion of integral plug
146 down over the peripheral edge portion of the aper
such as shown at 26 in FIGURES 4 and 5 are unneces
ture disk 142. In this particular embodiment the bottom
sary.
body is made of nylon and can be readily so deformed.
The absence of such struts permits a greater universality
It is the cover disk 142 which engages the upper end por
for the cover 28 since it is not required to have speci?c
tion of the "bifurcations 120 that serves together with the
areas for engagement with struts. The latter may be 50
shoulders in the bottom of slots 128 and 130 to maintain
variously disposed in the main section of insulation, de
the plug blades in position.
pending upon the number of terminals required as well
The bottom body 102 is also provided with three
as certain speci?c positioning thereof.
threaded holes 148 adapted to receive screws 150 to retain
The cover or top body 28 shown in FIGURE 6 has a
the top body 100 in assembled position with respect to
cable clamp identical to that shown in FIGURES 1 to 4 55 the bottom body 102.
inclusive, and {the same reference characters are applied
To cover, mechanically protect and electrically insulate
thereto.
'
the terminals a top body 100 is provided, having the
FIGURE 8 illustrates the changes necessary in an at
same general con?guration as the lower body 102. As
tachment-plug blade to eliminate the need for positioning
shown in FIGURE 9 the vertical outer surface 152 of
it by means of a strut and the cover plate. The parts
the top body is serrated by means of longitudinally ex
at 75. The teeth are sloped toward the plate 70 and sized
and spaced apart as seen in FIGURE 6 to at least partial
whose reference characters are primed are identical to
those of the same unprimed numbers on FIGURE 5,
‘tending vertical grooves. The top body in this embodiment
is rziiade from nylon although other materials could be
but two sets of teeth, on opposite edges of the blade
use .
are shown at 14", and obviously the slots 20 seen in FIG
A cable-clamp assembly for holding the conductor cord
URE 4 must be adjusted in width to accommodate the 65 or the like, rigidly and to releive the terminal and indi
teeth, which function the same as those shown and de
vidual conductors of strain is integrally formed with the
scribed in connection with FIGURE 7. They may be re
top body. As illustrated in FIGURES 9, 1'0, 11 and 19, on
lied upon to provide ?rm anchorage for the blade
opposite sides of the cord opening 160 in the top portion
terminal plate units.
70 of the top body there are integrally provided ?exible exten
It will be appreciated that if a single-piece insulating
sions 162 projecting upwardly as continuations of the wall
body is preferred to the two-part one shown, that the
of opening 160, said extensions generally being of less
cable grip described above can readily be molded in
than 90 degrees in extent with respect to the periphery
tegrally therewith just as it is with the cover 28.
of the opening 160. A substantial distance above the top
Referring to FIGURES 9—16 and 19 there is illustrated 75 surface of the top body 100 these extensions have rela
3,328,748
7
8
tively ?at upper ends 164. Each of the extensions 162 is
tom body of the embodiment of FIGURES 9-15 ‘and 19,
substantially thickened in a radial direction a substantial
the body 210 is provided with threaded holes 216 to re
ceive screws to retain the top and bottom bodies in assem
distance downwardly from the top 164. This thickened
area is found with a concave inner face 166 to somewhat
conform to the cord which is to be gripped between these
confronting concave faces 166 of clamping members 168.
To provide clamping means, each of the clamp mem
bled position. Those holes are formed in an offset por
tion for the same assembly purpose as the previous em
bodiment of FIGURES 9-15 and 19. The body 210 is
also provided with a top cover disk 220‘ having wire holes
222 and adapted to be riveted onto the body as shown
bers 168 is provided with a pair of laterally extending
in FIGURE 20 by heading the upstanding plug portion
wings 170. Each wing has an aperture 172 aligning with
a respective aperture in the wing confronting it. The con 10 224 of FIGURE 18 so that it bears down on the cover
disk 220 to hold in on the bottom body.
fronting wings are parallel to each other and are adapted
Referring to FIGURE 20, there is illustrated the assem
to clamp the cord between the clamping members in the
blage embodying the female contact unit. The female con
manner illustrated in FIGURES 1 and 2 and described
tact assembly is assembled in the bottom body 210 in the
previously.
same general manner as the plug blade 108 in the embodi
As best illustrated in FIGURES 11—13, the top body
ment shown in FIGURE 19. The screw 208 is positioned
in the U-shaped bracket 196 and threadedly carries a
wire-engaging nut 230. The top body 232 ?ts down over
countersunk holes 180 found in therein and extending
the bottom body 210 and is secured thereto by means of
downwardly into enlarged portion 182 of the side wall
176. This enlarged portion 182 is offset from the lower 20 screws 234. A plug blade 238 is shown inserted in the
spring contact unit 190.
edge of the side wall 176 as shown in FIGURE 13.
I claim:
Referring to FIGURE 19, the bottom body 102 is sized
1. In an electrical connector cap, in combination, a disc
to ?t within the top body 100, in the manner indicated.
of a semi-rigid type plastic having a central cord hole
The three portions of the bottom body having threaded
holes 148 adapted to register with holes 180‘ in the top 25 therein, a pair of arcuate cable clamps having lateral
wings and connecting means arranged and sized to clamp
body are offset with respect to the top surface of the
an electric cord passing through said hole, a thin relatively
bottom body so that when the top ‘and bottom bodies are
100 includes a vertical cylindrical side wall 176 with a
top portion 178. This top portion has three screw-carrying
brought together, the respective offset portions of the two
?exible portion connecting each clamp to but spaced from
the disc with its inner face substantially aligned with the
bodies engage each other to limit inward movement of
the bottom body. With the two bodies 50 arranged, screws 30 wall of said bore, said disc, clamps, wings and ?exible
portions ‘being all integrally molded.
150 are introduced and the assembly is complete.
2. The invention as set forth in claim 1 and wherein
This particular embodiment is also adapted for use with
the disc of a semi-rigid type plastic having a central cord
a female contact arrangement as illustrated in FIGURES
hole therein comprises a two-part body, the ?rst body part
17, 18 and 20. The female contact assembly 190 as shown
in ‘FIGURE 17 comprises a pair of contact springs 192, 35 housing terminal plates and connector screws, said ?rst
194 mounted on a U-shaped bracket 196 so that they are
in parallel spaced-apart position. The U-shaped ‘bracket
body part having cont-act elements extending from each
terminal plate, and the second body part covering said ter
minal plates and screws and having a central cord hole
196 includes a base portion 198 with upstanding parallel
therethrough.
bifurcated portions 200 and 202. The height of bifurcated
References Cited
40
portion 202 is less than that of 200. The bifurcated por
UNITED STATES PATENTS
tions form slots 204 and 206 respectively, aligned to re
963,733
7/1910 Kliegl ___________ __ 339—107
ceive a screw 208 supported by the base of both slots ‘as
2,259,328 10/1941 Sinninger ________ __ 339—l90
‘shown in FIGURE 20.
1/1946 Smith _________ __ 339--277 X
The bottom body 210 of this embodiment is cylindrical 45 2,393,481
2,927,297
3/1960 Hubbell __________ __ 339-—-196
in shape and is adapted to be assembled to a top body
like that assembled with the male contact unit. The bot
MARVIN A. CHAMPION, Primary Examiner.
tom body 210 has an enlarged vertical hole 212 extending
EDWARD C. ALLEN, ALFRED S. TRASK, RICHARD
from the top thereof and terminating in a small hole 214
E. MOORE, Examiners.
providing access for the male plug blade. As in the hot 50