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Патент USA US2119066

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May3l, 1938.
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-c.w. ABBOTT
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2,119,056
ELECTRIC ATTACHMENT PLUG RECEPTACLE
Filed Dec. 15, 1934
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INVENTOR
CHARLES W ABBOTT
BY HIS ATTORNEYS
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2,119,066
Patented May 31, 1938v
UNITED STATES PATENT OFFICE
2,119,066
ELECTRIC ATTACHMENT PLUG '
REGEPTACLE
I
Charles W. Abbott, Larchmont, N. Y.
Application December 15, 1934, Serial No. 757,717
7Claims.
(Cl. 247-15)
This invention relates to electric attachment
' plug receptacles.
More particularly it relates to
attachment plug receptacles for use with surface
wiring where both the electric wiring conduit and
5 the receptacle are secured to the outside of the
wall‘ in a room of a dwelling or other structure.
My receptacle is particularly adapted for use with
the wiring system described in my copending ap
plication Serial No. 571,962, patented December
10 18, 1934, No. 1,984,355.
It is an object of my invention to provide an
attachment plug receptacle for mounting upon
the surface of a wall in such a position for ex
ample as adjacent the base board, which recep
15 tacle may be inverted so that either side of it
may be adjacent the base board and still permit
the wiring conduit to enter directly into the re
ceptacle without deviation from its rectilinear
direction.
Another object of my invention is to provide a
20
polarized electric attachment plug receptacle for
surface wiring, which can be used adjacent a
base board and which may have either the
grounded or the live side adjacent the base board
25 depending upon whether the grounded line is
uppermost or not in the conduit.
rial No. 571,962 now Patent 1,984,355. This type
of conduit as explained in my aforementioned co
pending application has the advantage that it is
more readily adapted to turn corners than con
duits for surface wiring which have been used
heretofore. One reason for this, as described in
my copending application is the fact that the
wires l5 and I‘! lie loosely within the conduit al
though they are isolated by the central rib Ma,
and are not required to expand and contract in 10v
the same way as the ?exible rubber casing of the
conduit at corners. Notwithstanding the adapt
ability of this type of conduit to make curves
when necessary, it is desirable insofar as possible
both from the standpoint of ‘appearance and from
ease of installation that the conduit be continued
in a straight line and that curves be avoided.
This is particularly true where the conduit is
positioned to run parallel and slightly above or
adjacent to the ?oor molding or base board of a 20
room.
The base ii of my receptacle preferably com
prises a slab of insulating material with a ?at
rear face adapted to lie against the wall III._ This
base is preferably rectangular in plan and has
one or more lugs ll, 20 on opposite sides of the
base adapted to fit into recesses formed in the side
receptacle of the above type which may be eco _walls 0! a cover 24. The lugs II are staggered
nomically constructed of few parts and easily and with relation to the lugs 20 so that the cover 2i 30
may be fitted over the base‘ It in one way only and
quickly assembled and attached to a wall.
Another object of my invention is to provide a thus is incapable of reversal with respect to the
base. This is imperative in a polarized device as
receptacle of the above type which when connect
ed with a wiring conduit will completely enclose hereinafter explained.
The base it .has formed upon it at its central
all current carrying parts.
Another object of my invention is to provide a
85
Other objects and advantages of my invention
will become apparent as it is described in con
nection with the accompanying drawing.
‘In the drawing:
Figure 1 is a plan view oi’ a receptacle con
40 structed according to the principles of my inven
tion shown in position adjacent a base board.
A portion of the cover of my receptacle is broken
away for the purpose of illustration.
Figure 2 is a plan view of the base showing the
45 construction and positioning of, the parts. This
view is on a slightly larger scale than Figure 1.
Figure 3 is an end view vof the construction
shown in Figure 1.
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v
Figure 4 is a side elevation view of my recep
50 tacle with the cover in section taken-along the
line H of Figure 1.
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' v
_ Referring to the drawingja' wall II with a base
board l2 attached to it adjacent the ?oor, has
attached to it an electric wiring conduit "of the .
55 type illustrated in my copending application Be
portion a. longitudinally extending spine 20 to sep
arate and insulate two identical metallic members
which are secured to the base on opposite sides of
the spine and comprise contact portions 2!, 20
and wire terminal portions 80, ll. These me
tallic members may be stamped from sheet metal. 40
The metallic members are secured to the base by‘
means of oppositely directed arms 32 extending
laterally from the wire terminal portions 30, ll
and bent down into recesses 34 formed in the base
It at the sides of the wire terminal portions.
The contact portions 28, 20 of the metallic mem
bers are bent up at right angles to the wire ter
minal portions and have contact fingers 28’, 28'
at their ends forengagement with the prongs of
a conventional attachment plug cap in the usual 50
manner.
Wire binding or terminal screws 80
are turned into threaded apertures in the wire
terminal portions l0, 3! to hold the conductors or
wires II and ll of the conduit IA.‘ To keep these
wires from slipping out from beneath the heads
55
2
2,119,066
of the terminal screws, 2. pair of parallel fingers
38 are turned up at right angles to the wire ter
_The cover of the receptacle is made of molded
while in reversed position. In order that the
cover may be placed on the base only in the
position with the large apertures over the ground
ed contacts 29', pairs of lugs l8 and 20 staggered
with relation to each other project from opposite
insulating material, preferably, and has ?at par
allel side walls 24:: and 24b and parallel end walls
sides of the base and fit into recesses in the sides
of the cover.
minal portion 30 adjacent the periphery of the
terminal screw.
240 and 24d. The top of the cover is ?at and is
. joined to the end walls by a stepped formation
10 24f, although the top could be connected directly
to the end walls.
Each end wall comprises a pair of spaced weak
ened sections, the outline of one ofthese sections
being shown at 246. These sections are made
15 mechanically weak so as to be capable of destruc
' tion upon the application of a small amount of
force which may be applied by the use of a screw
driver or a pair. of pliers or other handy tool in
the equipment of an electrician. The portions of
20 the wall around these sections of reduced strength
are considerably stronger than the sections so
that the wall itself is not destroyed by the re—
moval of the weak vsection. Preferably the area
and shape of the weak sections are substantially
25 identical with the cross section of the wiring con
duit [4 with which the receptacle is designed to
be used. Therefore upon the breaking away of
a. section the end of a conduit may be entered
beneath the cover. In length the cover is slightly
longer than the length oi the base as shown in
Figure 1, in order that the conduit may enter be
neath the protection of the cover before the bare -
wires of the conductors l5 and I‘! are exposed for
a. connection with the terminal screws 01' the
35 metallic members. Because of the fact that the
conductors l5 and ll. are bare it is necessary for
them to be separated immediately upon their exit
from the protection of the outside covering of the
conduit H. For thispurpose a pair of posts 40,
40 42 are formed upon the base at its ends in posi
As before mentioned, the lower contacts 29'
and conductor l‘! are grounded. Hence, in con
necting the receptacle to the conduit the lower 10
weak section is broken away and the side of the
receptacle is placed adjacent the top of the mold
ing and is secured in that position with the end
of the conduit entering under the cover up to the
end of the base. At that point the covering for 15
the wires of the conduit is removed and the wires
are led to the terminals 30, 3! as follows. The
wire 65 is led above the post 42 around the end
of the spine 26 to the terminal 30, and the
grounded wire I1 is led below the post 42 directly 20
to terminal 39.
If, by chance, the ground wire should be upper
most in the conduit the receptacle would be re
versed, putting the contacts 28’ and tenminal 30
, nearest the base board and the ground terminal 25
3| and contacts 29 uppermost. Then the section
24c and its opposite at the other end of the cover
would be nearest the molding and would be
broken away for the conduit’s entrance.
In this case the wires are led on opposite sides 30
of posts 40 instead of posts 42.
'
The value and utility of the construction and
positioning of the posts 40, 42 and the pair of
weakened sections in each end of the receptacle
becomes apparent upon consideration of the fact
that the wires l5 and I] in the conduit are bare
and must not be crossed but must be kept sep
arate from the moment of their exit fromithe
protection of the. insulation of the conduit. The
construction just mentioned gives a ?exibility of
tion directly opposite the sections of reduced use to the receptacle that is not possible with
,
strength. Thus ‘when the conduit I 4 is entered prior constructions.
beneath the cover as-shown in Figures 1 and 3
For securing the base It to the wall the spine
with its end abutting the edge of the base, the 26 is enlarged at its ends and pierced as at 46
45 post 42 will in'effect form a continuation of the for the accommodation of wood screws. Also
wire-isolating rib I la of the conduit.
within the enlarged ends of the spine are other
In some localities it is required-by the authori
piercings 48 which are internally threaded and
ties thatv one wire of the circuit shall be grounded in which are received machine screws coming
and that electric wiring devices shall have the through apertures in the cover to hold the cover
50 terminals to which the grounded wire is to be con 7 on the base.
From the foregoing it will be apparent that I
nected differ in appearance vfrom the other ter
have constructed a receptacle for mounting ad
minal of the electric wiring device. This differ
ence in appearance is generally accomplished by jacent a base board, parallel to which an electric
tinning one of the terminals and leaving the conduit runs, which receptacle permits the entryv
55 other with its natural copper'or brass appearance. of the conduit therein without the necessity of 65
In the present case the lowermetallic member the conduit being bent in any way to make such
(29, 38) is the one designated for connection to entry and without the necessity of deviation of
the ground and conductor I1 is the grounded the conduit from its rectilinear direction or cross
conductor. It will be recalled by those skilled .ing of the conduit wires. It will also be apparent
'in the art that conventional polarized attach
that the foregoing is accomplished in spite of the
ment plug caps have one prong larger than the . fact that the receptacle is adapted for use in a
other. In' order that only that prong (the larger polarized circuit. It will furthermore be appar
of the two) of an attachment plug cap which is ent that my receptacle covers'all current carry
designated for connection to ground, shall be con
ing parts at all points and keeps them shielded
65 nectible to the grounded metallic member, special
from accidental contact which might cause a
precautions must be taken in forming the cover,
person to receive a shock or a short circuit to
as will now be described.
000111‘.
'
The top of the cover 24 is provided with two
pairs of apertures 44 and 46 positioned over the
Many modi?cations within the scope of my
invention will occur to those skilled in the art.
70 contact ?ngers 28', 29' respectively. The.aper ‘ ‘Therefore I do not limit myself to the exact con 70
ture 46 is larger than the aperture 44 in order struction of the embodiment shown.
that the larger or ground prong of the conven
I claim:
‘
tional polarized attachment plug cap may fit into
1. In a polarized attachment plug receptacle
aperture 46 but not into aperture 44 and hence for surface wiring, an insulating base having a
75 the cap may not be connected with the receptacle longitudinally extending central spine, metallic 75
2,119,006
r
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3.
spaced sections of reduced strength any of ‘which
‘members on opposite sides of said spine, said
metallic members having contact portions and
sections may be removed for the entrance of a _
terminal portions, a pair of spaced posts at each
surface wiring conduit running parallel to a mold
end of said base, a cover ?tting over said base
ing, said cover having ?at sides adapted to lie
along the molding, whereby upon removal of the in
and having apertures over said contact portions,
said apertures being of di?erent con?guration
one of said sections nearest the molding the con
duit may enter into said cover in unbroken con
, whereby the receptacle is polarized, said cover
dition, without deviation from its rectilinear di
rection, and posts on said base at each end oppo
site said sections for separating the wires of said
conductor within said receptacle.
5. In a receptacle for a surface wiring system,
a base of insulating material, contacts thereon
for engagement by the prongs of an attachment
plug cap, wire terminal means on said contacts,
a cover for said base having a length greater than
the base, a pair of weakened sections removable
for the entrance of a surface wiring conduit of
the type having a central rib separating parallel
wires, said base having posts opposite each of
said weakened sections in position to form a con
tinuation of the central rib of the conduit when
the end of the conduit within the cover abuts
having ?at sides adapted to lie along a base board,
each end wall of said cover being provided with
10 a pair of spaced sections of reduced strength any
one of which may be removed for the entrance
of a surface wiring conduit running ‘parallel to
the base board whereby the conduit may enter
directly into said cover without deviation from
15 its rectilinear direction irrespective of which side
of the receptacle is uppermost.
2. In an attachment plug receptacle for sur
face wiring, an insulating base having a longitu
dinally extending central spine, metallic members
on opposite sides of said spine, said metallic
members having contact portions and terminal
portions, a cover ?tting over said base and aper
tured over said contact portions, said cover hav
ing flat sides adapted to lie along a base board,
each end wall of said cover being provided with
a pair of spaced sections of reduced. strength any
one of which may be removed for the entrance
of a surface wiring conduit running parallel to
the base board, a ‘pair of posts at each end of
30 said base, a post being opposite each of said
the end of the base. _
6. In a receptacle for a surfacewiring system,
a base of insulating material, contacts thereon
for engagement by the prongs of an attachment
plug cap, wire terminal means on said contacts,
a cover for said base, means at each end of the
cover removable to form an entrance passage for -
a surface wiring conduit of the type having a
central rib separating parallel wires, means
opposite each entrance forming a continuation
of the central rib of the conduit when the end
' sections whereby the wires of a surface wiring
conduit are separated within the receptacle and
the conduit may enter directly into said cover
without deviation from its rectilinear direction
irrespective of which side of the receptacle is
of said conduit has entered said cover and is in .
abutment with said base.
7'. In an attachment plug receptacle for sur
face wiring, an insulating base, a cover for said face mounting, a one-piece base of insulating
base, contacts within said receptacle accessible ‘material adapted to be attached to a wall, a
one-piece hollow insulating cover for said base 40
40 through apertures in said cover, said cover hav
ing flat sides adapted to lie along a base board, constructed vand arranged to conceal and protect
each end wall of said cover being provided with vall current carrying parts on said base, said
a pair of spaced sections of reduced strength any base having a central longitudinally extending rib,
of which may be removed for the entrance of a like formed metallic members on opposite sides
surface
wiring conduit, a pair of posts at each of said rib and shielded from each other by said 45
45
end of said base, a post being opposite each of I rib, said metallic members each having a plu
said sections, whereby'the wires of the conduit rality of contact portions and a wire terminal
uppermost.
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3. In an attachment plug receptacle for sur
are separated within the receptacle irrespective
of which section the conduit‘ enters.
50
4. In an attachment plug receptacle for sur
portion, binding screws in said terminal portions
positioned for manipulation from the front of
~ the base, said cover having slots in register with
said contact portions, and sections of reduced
strength in each end of said cover adapted to be
face wiring, an insulating base, contact members
in said receptacle for engagement by the prongs
of an attachment plug, a cover of greater length
than said base, each end wall of said cover having
broken away to permit entrance of a conductor.
'
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CHARLES
W. ABBOTT.
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