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Патент USA US3064234

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Nov. 13, 1962
R. o. WILEY
3,064,224
WIRING DEVICE WITH GROUNDING MEANS
Filed July 10, 1959
74
WITNESSES
5M7?‘
INVENTOR
Roy 0. WIIey
W
ATT'
NEY
d?iidizd
Patented Nov. 13, 1962
1
2
a permanent ground connecting member are provided for
.
reliable and durable operation. Although the illustrated
3,064,224
WERZING DEVEQE WITH GRQUNDING MEANS
Roy 0. Wiley, Bridgeport, Conn, assignor to The Bryant
Electric Company, Bridgeport, Conn, a corporation of
Connecticut
Filed July It), 1959, Ser. No. 826,173
4 Claims. (ill. 339-14)
_'Ihe present invention relates to electrical wiring de
electrical receptacle will be described to point out the in
vention, other wiring devices having modi?ed structures
UK
will obviously appear to those who are skilled in the
art to which the invention belongs without departing
from the principles of the invention. Accordingly, in
view of this consideration, the detailed description of the
illustrative embodiment of the invention will now follow.
vices, and more particularly to receptacles in which a 10
With reference to FIGS. 1, 2 and 3, an electrical re
grounding connection is provided.
In applications where electrical potentials of a value
substantially above ground potential are found to exist,
it is often desirable in the interest of safety to provide an
electrical connection to ground from any normally neu 15
tral structures which are likely to be contacted by oper
ating personnel. Such a connection, then, ensures that
the mentioned structures will continuously exist at ground
ceptacle 8 comprises an elongated housing member 1%,
amounting member or yoke 12, and terminal members
14.
The housing 10 is integrally molded from a ma
terial having insulative and mechanical properties suit
able for the intended application of the receptacle 8. The
structure of the housing It} is such that it can support
and insulate the terminals 14 and, additionally, can sup
port the mounting member 12 whereby the cooperative
assemblage forms the receptacle 8 which then functions
potential and therefore cannot exist at any higher electri
1 cal potential as a result of any coupling with any other 20 in a fashion to be explained more fully hereinafter.
environmental structure having such a higher potential.
The housing it) includes two elongated terminal re
, ceiving piers 16 having a channel 13 (FIG. 2) therebe
tween. The piers 16 are spanned by faced- portions 2i)
I If, for example, a metallic casing or housing or other
structural member for an electrical device is to be
grounded, it is desirable that such a grounding connection
that can support electrical plugs (not shown) having
be made with the same motions that are made for es
25 prongs for insertion into the receptacle it. The men
tablishing other electrical connections for the electrical de
tioned channel 18 serves to receive the mounting mem
vice. In such a case, it is common to make use of a
ber 12 in a manner which will become more apparent
grounding prong which is projected, along with other or
later in the description.
energizing prongs, from a terminal plug of the device and
Structural walls 22, 26, 28 and 3d are formed to pre
which is connected to the housing of the device. When 30 sent substantially a rectangular parallelepiped geometry
the plug is inserted in a receptacle for connection to an
for each of the piers 16. Within the walls 22, 26, 2S and
electric energy source, the grounding prong is then en
3% is a chamber 24 for the reception of the terminal 14.
gaged by a contact which is provided in the receptacle
A particular description of the principles which govern
and which is permanently connected to ground.
the engagement of the terminal 14 by the pier l6 and
'Ihus, each'time the electrical device is connected to 35 the functional cooperation between these members is fully
the receptacle, a ground connection for the housing of
set forth in a copending application of S. A. Mason, en
the device is assured provided the grounding prong and
titled “Wiring Device,” ?led July 10, 1959, Serial No.
the grounding contact of the receptacle make a reliable
826,266, and assigned to the present assignee. It will
contact and provided the grounding contact of the re
su?ice to note here that, after engagement of the ter
40
ceptacle is reliably and permanently connected to ground.
minal 14 by the pier 16, an electrical contact or blade 32
The present invention is directed toward these last-men
on each end of the terminal 14 is positioned within the
tioned provisions.
pier 16 in a manner permitting engagement with a prong
of an inserted plug, reference to which has already been
It is therefore, an object of the invention to provide a
novel wiring device in which a reliable ground connec
tion is provided.
It is another object of the invention to provide a novel
wiring device for which a grounding connection is provided
integrally on a conductive support member for the wir
45
made.
The end wall 26 is provided with a projecting ridge 34i
along its inward lateral edge for engagement with the
mounting member 12 during assembly of the receptacle 8.
The other end wall 23 of each of the piers 16 is similarly
ing device.
provided with a projecting ridge 36 for engagement of the
It is a further object of the invention to provide an 50 mounting member 12. Additionally, a transversely ex
electrical receptacle in which grounding means are re
tending groove 38 is provided in each wall 23 for guid
liably yet economically included with the further ad
ance and retainment of a portion of the mounting mem
vantage of being readily accessible for establishing a per
ber 12. This latter relation will be more fully under
manent grounding connection thereto.
stood upon detailed consideration of the mounting mem
These and other objects of the invention will become 55 ber 12.
more apparent upon consideration of the following de
tailed description of an illustrative embodiment of the
The Wall 30 on the inner side of each of the piers i6
is provided with transversely extending ridges 46 to serve
invention in relation to the accompanying drawings, in
as fulcrum points for grounding contacts, to be described
which:
7
hereinafter, on the mounting member 12. Additionally,
60
FIGURE 1 is a top plan view of an assembled electri
a'longitudinal midsection 42 of each side wall 30 is gen
cal receptacle constructed in accordance with the princi
erally recessed from the plane of the side wall 3t} in order
ples of the invention;
to provide for reception of a corresponding midsection
FIG. 2 is a bottom plan view of the receptacle shown
43 of the mounting member 12. Themidsection 42 also
in FIG. 1 with only one terminal inserted therein;
provides for stable engagement of the mounting member
FIG. 3 is an exploded isometric view of a mounting 65 12 by means of transversely extending ridges 44.
member for the receptacle in FIG. 1 and for which
The mounting member 12 is most advantageously
grounding means are shown in a preassembled position.
viewed in FIG. 3. It is an elongated member constructed
In accordance with the broad principles of the inven
from a conductive but resilient material, such as sheet
tion, a wiring device comprises an integral housing that
steel, and adapted to be supported, as previously indicated,
receives and readily engages terminal members and a 70 by the housing 10. An elongated strip 46, with the broad
ened midsection ‘48, to which reference has previously
mounting means on which prong engaging contacts and
3,064,22é
3
been made, constitutes a substantial part of the length of
the mounting member 12. Adjacent each end of the
mounting member 12, a riser 56 extends upwardly to a
62.
ground potential. It will,...accordingly, be realized that
when a grounding prong makes electrical contact with
the mounting member grounding contact 72 an electrical
longitudinally projecting car 52.’ There is an'aperture 54
connection will exist between the prong and ground.
for passage of a mounting screw (not-shown) in eachof
the projecting cars 52. ‘What is generally denoted as an
end section 56 or 53 extends fromvthe strip 46 to a lower
tioned plug with a grounding‘prong can be inserted into
When the receptacle 8 'is-placed in use, the aforemen
portion of the riser 59 adjacent each end of the mounting
the receptacle 8 so that" the grounding prong passes
through the opening 76 of one of the faced portions 26.
securing a faceplate (not shown) over the receptacle 8
beyond the mounting member aperture 69 in alignment
when it is mounted.
Each of the end sections 56 or 58 additionally has in
the prong and the mounting member grounding contact
72. Thisv connection is occasioned by legs82 of the :con
tact 72 which are sufficiently resilient to exert a clamping
force upon the grounding prong. ,A full description of
There are ordinarily two-remaining plug prongs which »
member 12. Apertures 69 for passage of a grounding
prong, referred to hereinbefore, are provided in the end 10 then pass through faced portion slots 80 into engagement
with the terminal blades 32'located within the housing
sectiont56 and,tadditionally, in the midsection 48 of the
'26. Upon passage of the grounding prong through the
strip 46. The midsection 48 also includes an opening 62
faced portion opening 76 and consequently through and
through which a suitableyfastener may be passedtfor
therewith, a reliable electricalconnection is made between
wardly projecting cantilever tabs 64 for engagement with
the. housing 1%. The endsection 58 .has transversely ex
tending arms66 of which the ends are interconnected by
‘ acrossplate 68.. The crossplate 68 can beattached to the 20 the relationships which operate to provide this connection
appears in a copending application of C.
Smith,-en- Y
ends of the arms 66 by any convenient means, as by weld
titled Wiring Device, ?led November 29, 1957, Serial No.
ing portions 67 of the crossplate 68 to sides 69 of the arms
66 or, in certain instances, can even be integrally formed
noticed,
699,765, however,
was assigned
thattothe
the present
present construction-of
assignee; It will the
be
therewith. When the crossplate 68 is attached to the arms
66, an end portion or extension 70 of the crossplate 68 25 grounding contact 72 is such that a point of stress’ con
centration exists at each portion 8410f the-contact 72
projects beyond the lateral limit of each arm 66. Each
of the crossplate end extensions '70 then accede to the
character ofv a railing which is to be guided into the
previously-mentioned pier grooves 38' during assembly of
which is adjacent the fulcrum ridges ~46 of the housing 10. .
With the concentration of any existing stress at these
points of the grounding contact, little or no stress is trans
the wire device.
A grounding contact 72 is formed from resilient wire
into a shape substantially as shown in FIG. 3 and is
attached to the mounting member 12 adjacent each of the
grounding ‘prong apertures 69 so that the generally
16, such a cover can be provided in accordance with the
mitted to bight 86 where the grounding contact 72, in this
example, is welded to the mounting member 12.
Although the receptacle, described herein is not shown
to have an insulative cover for the underside of the piers
_U-shaped con?gurations of the aperture 60 and of the 35 principles of an invention described in another copending
application of S. A. Mason, entitled Wiring Device, ?led
grounding contact 72 are in alignment. This attachment
can be accomplished in any of a number of ways, but, in
July 10, 1959, Serial No. 826,218, and ‘assigned to the
present assignee. It remains to be noted that the construc
the embodiment shown, it is preferably made by welding.
tion of the receptacle is certainly economical for the com
ponent parts of the receptacle are minimized in number
Prior to any assembly of the receptacle'8 the grounding
contacts 72 and the'crossplate 68 can be united with the
bodyof the mounting member 12 as indicated above. An
assembly of the receptacle 8 can then be accomplished by
first inserting a terminal 14 in each of the piers 16 of the
housing 10 in a manner fully described in the previously
and are simpli?ed in structure.
that a reliable grounding connection is" always available
for the receptacle.
mentioned copending application. The mounting mem
~
V
In the fo'regoingdescription, an embodiment of the
invention, as already indicated, has been described for
ber 12 can then be assembled with the housing 10 in a
manner such that the mounting member strip 46 passes
into the channel 18 betwen the piers 16 of the housing 10.
When the mounting member 12 is inserted to a position
against under surfaces 74 of the faced portions 20, en
gagement of the mounting member 12 with the housing
1% can then be made, desirably by applying an impulsive
force to the cantilever tabs 64 and thereby inbedding the
tabs 64 in the projecting ridges 34 and 36 of the pier end
This economy of con-~
struction, however, does not impair the reliability of any
operation of the receptacle. 1It is particularly noteworthy
illustrative purposes only. Accordingly, it is desired that
the invention be not interpreted'as being limited‘ to the
described embodiment, rather it is desired that it? be "
accorded an interpretation consistent with the scope and
V spirit of its broad principles.
walls 26 and 28. However, in certain cases such as those
instances pointed out in the mentioned copending applica
tion, the mounting member 12 can be engaged with the
housing 10 through frictionalcooperation without‘ the ap
plication of an impulsive force. Additional stability, con
tributing to engagement between the mounting member 12
andthe housing 10; exists between, the mounting member
What .is claimed is:
'~
7
r
1. An electrical wiring device adapted for reception of
a plug having a grounding prong, said device‘ comprising 7
an elongated housing having spaced projecting portions‘
extending transverselyv of said housing, a terminal mounted
within each of said portions, aV-conductive, elongated
mounting member, and resilient, conductive arms being '
positioned longitudinally of said mounting member, said
arms being spaced adjacent one end thereof and aligned
with the insertional path of said prong and being in prox
strip ~46 and the side wall ridges 40 and 44. Furthermore,
imity to one another adjacent their opposite ends, means
the end extensions or railings 70 of the crossplate 68 will
for joining said arms at their proximate portions to said
have been guided into a position within the grooves 38 of
the end walls 28. This latter relationship provides, among 65 mounting member, means on said housing portions posié
tioned against an intermediate portion of each of said
other things, lateral stability for the crossplate 68 and the
arms for concentrating at the intermediatearm portions.
arms 66. It is to be noted, however, that the crossplate
forces originating in the spaced ends of said’ arms when
68 can be attached to the mounting member 12'after' the
. said prong is inserted therebetween, said mounting mem- V
mounting member 12 is assembled with the housing 10.
With the mounting member 12 fully inserted, the 70 her additionally having a substantially transverse portion
engaging said housing portions, and said transverse por-'
' grounding prong apertures 60 of the mounting member 12
are in alignment with grounding prong openings 76 pro
vided in the faced portions'20. A terminal screw 77 can
be passed into an opening 78 of the crossplate 68 as means
for engaging a wire or other conductor maintained at 75
tion having means for engaging a grounding conductor,
whereby said prong can be connected to said mounting '
member arms for a grounding connection with'said con- '
ductor.
3,064,224
5
5
2. An electrical wiring device adapted for reception of
portions and extending from said rear housing side sub
stantially perpendicularly toward said front housing wall,
a plug having a grounding prong, said device comprising
an elongated housing having spaced projecting portions
and means for engaging a wire with said crossplate.
extending transversely of said housing, a terminal mounted
within each of said portions, a conductive, elongated
mounting member, and resilient arms being positioned
longitudinally of said mounting member, said arms being
spaced adjacent one end thereof and aligned with the in
sertional path of said prong and being in proximity to one
another adjacent their opposite ends, means for joining 10
4. An electrical wiring device adapted for reception of
a plug having a grounding prong, said device comprising
an elongated unitary insulative housing having spaced
elongated portions and having an elongated channel ex
tending in length between said spaced housing portions
from one end thereof to the other end thereof and extend
ing in depth from a rear side thereof to an inner surface
said arms at their proximate portions to said mounting
member, means on said housing portions positioned
against an intermediate portion of each of said arms for
of a front housing wall, an elongated grounding mounting
member having an elongated portion located in said chan
nel adjacent said inner wall surface and having respective
concentrating at those portions forces originating in the
mounting ears extending longitudinally outward of the
spaced ends of said arms when said prong is inserted there 15 ends of said housing, means for supporting said mounting
between.
3. An electrical wiring device adapted for reception of
a plug having a grounding prong, said device comprising
an elongated unitary insulative housing having spaced
elongated portions and having an elongated channel ex
tending in length between said spaced housing portions
member relative to said housing, at least one arm extend
ing substantially perpendicularly rearwardly from said
mounting member adjacent one end of said channel, an
elongated crossplate extending across said arm laterally
20 of said mounting member and being secured to said arm,
the opposite end portions of said crossplate extending
beyond the laterally outer sides of said arm, respectively,
said crossplate end portions matingly supported in respec
surface of a front housing Wall, an elongated grounding
tive guide grooves opposingly located in said spaced hous
mounting member having an elongated portion located in 25 ing portions and extending from said rear housing side
said channel adjacent said inner wall surface and having
substantially perpendicularly toward said front housing
respective mounting ears extending longitudinally out
wall, and means for engaging a Wire with said crossplate.
ward of the ends of said housing, means for supporting
said mounting member relative to said housing, a pair of
References (Iited in the ?le of this patent
from one end thereof to the other end thereof and ex
tending in depth from a rear side thereof to an inner
arms spaced laterally of said mounting member and ex
tending substantially perpendicularly rearwardly from
30
UNITED STATES PATENTS
1,648,797
Cohen et al ___________ __ Nov. 8, 1927
1,915,070
1,927,245
Muldoon ____________ __ June 20, 1933
Russell _____________ __ Sept. 19, 1933
the opposite end portions of said crossplate extending be 35 2,519,121
2,686,297
yound the laterally outer arm sides, respectively, said
2,890,265
crossplate end portions matingly supported in respective
2,974,301
guide groves opposingly located in said spaced housing
Del Camp ____________ __ Aug 15, 1950
Hutt ________________ __ Aug. 10, 1954
said mounting member adjacent one end of said channel,
an elongated crossplate bridging said arms laterally of
said mounting member and being secured to said arms,
Smith ______________ __ June 9, 1959
Slater ______________ __ Mar. 7, 1961
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