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Патент USA US2130424

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Sept. 20, 1938.
A. E. GRANT
2,130,424 '
ATTACHMENT PLUG I
Filed June 29, 1936
2 Sheéts-Sheet 1
/.
ATTORNEY
Sept. 20, 1938.
‘
A, 5, GRANT
2,130,424
ATTACHMENT PLUG
Filed June 29, 19,36
.
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INVENTOR
lb‘erf .?ranf
ATTORNEY
2,130,424
Patented Sept. 20, 1938
UNITED ‘STATES PATENT OFFICE
2,130,424
ATTACHMENT PLUG
Albert E. Grant, New York; N. Y., assignor to
Albert T. Otto & Sons, 1110., New York, N. Y.
Application June 29.1936. Serial No. 87.879
6 Claims. (01. 173-461) '
My invention relates to the male elements of to provide in an end plug a contact blade or
electrical coupling devices of the type .commonly prong member having an integral ?anged foot
known as attachment plugs, end plugs, or con
portion in which the bend de?ning the foot por
nector caps. Such devices are commonly carried tion is sturdily reinforced to stiffen and strength
5 on the ends of extension cords and comprise an en the construction and to insure that the prong a
insulating cap or body and a pair of spaced metal will remain inalignment in use and will not be
contact blades or prongs to which the extension subject to bending and breaking. Other and '
cord wires are connected. More particularly my further objects will appear from the following
invention relates to the metal conducting parts
an of such devices.
-
Male plugs of the character here dealt with
are sold in large quantities at low prices and,
commercial competition being keen, inferior de
vices have become common in which the insulat
15 ing material is of comparatively lowvdielectric
strength and the metal parts are formed of steel
or other fast rusting metal of comparatively low
conductivity rather than the. more expensive and
highly desirable brass. The speci?cations which
20 the manufacturer is ordinarily required to meet
speci?cation.
7
Referring to the drawings which form a part 10
of this speci?cation:
-0 Figure 1 is an elevational view, partly in sec
tion, showing an end plug embodying the features
of my invention in coupled relation with a stand
ard receptacle plug member.
_
15
Figure 2 is an inverted plan view of the male
member embodying my invention.
Figure 3 is a perspective view ofmy improved
blade or prong.
'
.
demand that the blades or prongs comprise con
Figure 4 is an elevational view, partly in sec- 20
tion, showing a modi?ed embodiment of my in
ducting metal of approximately one-sixteenth
inch thickness in order that they will have the
vention.
Figure 5 is a perspective view of the prong
- necessary strength and stiffness to maintain their
member shown in Figure 4.
s.
-
25 position and alignment, such requirements being
directed to the mechanical efficiency of the device.
Figure 6 is aview similar to Figure 1 showing 25
my improved end plug in coupled relation with
Such weight of .blade material is not necessary Y a standard receptacle having contacts located
for electrical e?iciency because, as will be readily adjacent to the inner walls of the sockets.
The device comprises an insulating body or
understood, the current load carried by the con
to tact blades can be no greater than the capacity cap l0 having a central wire passage therethru 80
of the comparatively light wires of the extension at H, the face of the cap being recessed inter
cord.
'
mediate its margins at l2. A pair of plug-in
It is a principal object of my invention there contact members "-44 are secured to the re
fore to provide an end plug having improved cessed portion of the cap on opposite sides of the
as blades or prongs so formed as to obtain greatly
central wire passage Ii by means of studs or
‘ increased strength and sti?ness, thereby permit- _ ’ staples 20-20 which extend through the ?anged
ting the use of blade metal of lighter gauge than foot portions l8 0! the members and into the
has heretofore been practicable, and making it walls of the cap. A binding terminal 2| is
possible to produce a device oi the highest quality - threaded through each of the foot portions and
40 at reduced cost.
‘
The blade or prong members of end plugs are
usually formed with foot portions whereby they
extends into a recess- in the cap formed to ‘3
receive it.
'
The contact members are formed from iiat
are attached to the insulating housing or cap, the metal by means of progressive dies adapted to
[foot portions comprising i?anges integral with form a deep reinforcing channel I‘! in the prong
45 the projecting portions of the blades and pro- ‘ or blade portions I5 over the greater part of 45
their area intermediate their edge margins and
.
vided with means whereby the ends of the ex
tension cord wires may be connected. These foot the bends at It, the opposite face of each blade
portions are ordinarily de?ried by a bend in _.the - having a corresponding rib embossed thereon at
i
?at metal from which the conducting parts of ll
The reinforcement of the blades thus provided 50
50,the plug are formed. I have found that the
weakening e?ect of such bends often results in imparts to them great sti?ness and the overall
the projecting prong portions becoming disaligned blade thickness from the outer surface of the rib
in use and, in some cases,‘ the blades actually to the inner face of the-blade is at least double
break at or closely adjacent to the bends.
the thicknessof the metal from which the con- .
.55 ‘ It'is another object of my invention therefore tact member is formed. The entering ends of the 5‘
2.,
_ 2,180,424
2. A plug-in contact member for'an attach
ment plug comprising ?at conducting metal
blades being unchanneled, however, have only the
thickness of the metal stock and are readily in
serted in the socket apertures 36 of a standard
convenience outlet or a receptacle plug member
such as 35.
transversely bent to de?ne a foot portion'and a
prong portion perpendicular to said foot portion,
said member having an angular ?ange integral
'
with a side edge thereof in the corner de?ned be
tween said foot and prong portions whereby the
member is braced at and adjacent the bend, said
This construction permits the use of very light
gauged conducting metal having thickness'only
one-half or even one-third that ordinarily re
prong portion having a stiffening rib embossed
thereon extending over the greater portion of its‘ 10
quired in devices of this type, the saving in the
material employed permitting the use of the high
est grade of brass without increasing the cost
contacting area, and means carried by the foot
I portion for connecting a wire thereto.
above that of the cheapest steel prongs.
3. A plug-in contact member for an attach
As shown, an opening is formed through the
ment plug comprising ?at conducting metal
embossed portion of each blade at 30 for engage
transversely bent to de?ne a foot portion and a 15
15 ment by the usual protuberances 4| formed on
the contact members 40 of female receptacles, prong portion perpendicular to said foot portion,
. generally, where such female contacts are posi
tionedagainst the outer walls of the receptacle
" said member having an angular ?ange integral
with a side edge thereof in the corner de?ned
sockets. Where the female contacts are located
20 adjacent the inner walls of the sockets, as at
-.40’ in Figure 6, their protuberances will be faced
outwardly and will be engaged by the shoulders 3|
de?ned at the lower end of the channel adjacent
25
the opening 30.
To further strengthen and stiffen the struc
ture, particularly where the lighter metal is em
‘ployed, an angular ?ange 33 is formed in the
angle de?ned by the bend. l9 dividing the prong
and foot portions of the device. This bracket-like
?ange is readily formed by swaging the metal at
the time the bend I9 is imparted to it and braces
the blade most e?iciently, holding it at all times
in accurate alignment perpendicular to the foot
portions and overcoming any tendency for the
35 blade to bend or break at or adjacent the bend.
The modi?cation shown in Figures 4 and 5 em
between said foot and prong portions whereby the
member is braced at and adjacent the bend 20
therein, and means carried by the foot portion for
connecting a wire thereto.
4. An attachment plug comprising a housing
of insulating material having a wire passage
therethrough and a pair of contact blades pro
jectlng therefrom, each of said blades compris
ing a straight strip of ?at conducting metal less
than one-sixteenth inch in thickness having a
longitudinally extending reenforcing rib em
bossed on one face and a corresponding channel
in the opposite face thereof, said channel ex‘
tending over the greater portion of the project
ing area of the blade and terminating adjacent
the free end of the blade to form a shoulder po
sitioned for engagement with the usual protuber
ances carried by the contact elements of standard
bodies blades having the same structural'char- . receptacles.
‘
5. A plug-‘in contact member for.an attach
acteristics as the blades described in Figures 1
ment
plug comprising a thin strip of ?at, conduct
to 3 and in addition illustrates the blade tips 5!]
ing metal having a _ longitudinal stiffening rib
reduced
in
width,
extended
in
length,
and
bent
40
back upon themselves to reinforce the structure. embossed on one face and a corresponding chan
at that point and to provide shoulders 5l-5l
de?ned by the inwardly turned blade ends, such
shoulders being adapted for engagement under
nel in the opposite face thereof, the end portion
of the strip being of less width than said rib and _
reversely bent into said channel, the end edge of
the strip terminating to form a transverse shoul 45
the
protuberances
ll’
of
receptacle
contact
mem
45
der positioned for engagement by the usual pro
bers 40' (indicated in‘ broken’ line in Figure 4)
where such members are located adjacent th ' tuberance carried by the contact element of a
inner walls of the socket openings. ,~
standard receptacle.
. '
Having thus described my invention, I claim:
50
1. An attachment plug comprising an insulat
ing body having a central wire passage therethru,
conducting members carried by the body on op
posite sides of said passage, said members each.
comprising a strip of ?at conducting metal trans
versely ‘bent to de?ne a foot portion whereby the
55
member is attached to, the body and a prong
i portion projecting perpendicularly from the foot
portion, said members each having an angular
?ange integral with a side edge thereof in the
60 corner de?ned between said foot and prongvpor
tions to brace the, members at and adjacent the
bends therein, each of said prong portions being
stamped intermediate its margins to provide a
longitudinal reinforcing rib on one face and a
65 corresponding channel on the other face thereof,
and wire binding terminals carried by. each of
said members.
"
6. vA plug-in contact member for an attach
ment plug comprising a thin strip of ?at conduct
ing metal transversely bent to de?ne a foot, and
2. prong perpendicular to said foot, said member
having an angular ?ange integral with a side
edge thereof in the corner de?ned between said
foot and prong whereby the member is braced‘
adjacent the bend therein, said prong havinga
longitudinal stiffening rib embossed on one face
and a corresponding channel in the opposite face"
thereof-‘,the end portion of said‘ prong being of
less width than said rib and reversely bent into‘
said channel. the end edge of the prong termi
nating to form a transverse shoulder positioned
for engagement by the usual protuberance car
ried by the contact element of a standard re
ceptacle.
'
ALBERT E. GRANT.
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