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Патент USA US2407142

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Sept. 3, 1946.
2,407,142
L. W. COLE ET AL
BUS DUCT
vFiled Nov. 17, 1942
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Patented Sept. 3, 1946
2,407,142
IUNITED STATES PATENT OFFICE
2,407,142
BUS DUCT
Louis W. Cole, New York, and Helge Jensen,
Flushing, N. Y., assignors to Cole Industries,
Inc., Long Island City, -_N. Y., a corporation oi‘
New York
Application November 17, 1942, Serial No. 465,382
6 Claims.
(Cl. 173-334;.1)
1
"D
a
This invention relates to plug-in bus-ducts for
electrical distribution systems.
The primary object of the present invention is
with reflexed portions I5 and i8, respectively,
forming lips co-extensive in length with the
companion flanges. The flat bare bus bars 20,
the provision of a bus-duct of such construction
preferably formed of copper, are mounted in the
that the quantity of steel and/or copper for the
duct and bus bars, respectively, or the quantity
space between confronting walls I5 of the pair of
longitudinal members it and extend longitudi
nally of the duct. More particularly, said bus
of other metals of which the duct and bars are
formed is considerably reduced, for the same cur
bars are mounted at equal distances from each
rent capacity of the bus bars, in comparison with
other and at equal distances from the opposite
the bus-ducts of the prior art.
10 sides of the duct, provision being made for the
In accordance with the present invention, the
electrical connection to said bus bars of the
bus-duct is of such construction that the interior
prongs of branch outlet plugs which may be
of the duct is open to the ambient atmosphere
plugged into the duct from either or both sides
externally of the duct, whereby the bare bus bars
thereof. The bus bars are supported by insula
in the duct are exposed to the cooling action of
'- tion blocks 22 disposed in longitudinally spaced
the ambient atmosphere. Pursuant to this in
relation between longitudinal members I8. Said‘
bus-bar supporting blocks 22 are each provided
vention, the quantity of metal of which the duct
with a plurality of laterally spaced plug-receiving
itself is formed can be substantially reduced
openings 24 which communicate with slots 26 in
while the bus bars may be of the same size as
those provided in enclosed ducts, and further 20 the inner ends of said blocks, in which the bus
pursuant to this invention the quantity of copper
bars 20 are received. The slots 26 are prefer
required for the bus bars can be substantially
ably only slightly wider than the thickness of
reduced and a yet greater saving in the quantity
the bus bars. respectively, whereby the opposite
sides of each bar are frictionally engaged by,
of metal required for the duct itself can be ef
fected with reduction in the size of the bus bars, 25 or lie closely adjacent to, the opposite sides, re
spectively, of the companion slots 26. The bus‘
for the same temperature rise as in the enclosed
bus-duct.
bar supporting and plug-receiving blocks 22 are
The present invention and the objects, fea
preferably of the construction shown and de
tures and advantages thereof will be more fully
scribed in our application Ser. No. 410,143 which
understood from the following description con 30 has matured into United States Letters Patent
sidered in connection with. the accompanying il
No. 2,306,353, issued to the assignee of our pres
lustrative drawing.’
ent application. It will be understood that the
In the drawing:
prongs of the branch outlet plugs are received
within openings 24 and engage the opposite sides
Fig. 1 is a side view of a length or section of
bus~duct embodying the present invention, parts 35 of the bus-bars in said openings, respectively, as
illustrated in said application. Also, it will be
being omitted for the purpose of illustration;
understood that the bus-bars are held by blocks
Fig. 2 is a perspective view of a part of the bus
22 with the flat faces of said bars transverse or
cluct shown in Fig. 1;
at right angles to the planes of openings 24 and
Fig. 3 is a sectional view, on the line 3—3 of
Fig. 1, with parts omitted for the purpose of illus 40 are in other respects as well supported by blocks
tration;
'
Fig. 4 is a sectional view, on the line 4—-4 of
22 in the same way as in the bus-duct illustrated
in said patent.
The manner in which longitudinal members I 9
Fig. 1, with parts omitted for the purpose of
are secured in duct-de?ning relation and the
illustration.
Referring now to the drawing in detail, the 45 manner in which blocks 22 are mounted in posi
bus-duct embodying the present invention com
tion will now be described. The means provided
for this purpose comprises transversely extend
prises a pair of longitudinal members In dis
posed in laterally spaced parallel relation and
ing metal plates 23 disposed at one side of the
extending longitudinally of the duct. Said longi-_
duct in spaced relation longitudinally thereof
tudinal members I9 are preferably formed of 50 and similar plates 30 disposed at the opposite
sheet steel and are each provided with out
sides of the duct in spaced relation longitudi
turned ?anges I2 and I4 projecting at right an
nally thereof and in spaced relation longitudi
gle to the main walls I5 of said members and
nally of plates 28 at the ?rst mentioned side of
extending continuously for the full length
the duct. 'Plates 33 are preferably secured to
thereof. Said ?anges I2 and I4 are provided ' longitudinal members I0 and more particularly
2,407,142
3
to the ?anges M of said members by spot weld
IE or l8, as the case may be, and thereafter fas
tening the opposite end of said plates to ?anges H
ing said plates to said flanges as indicated at 3|
or M by screws ?ll.
in Fig. 1l. Plates 28 are removably secured to
longitudinal members it, preferably by means of
With a duct constructed as hereinber‘ore de
screws 32 which are threaded through said plates en scribed, the amount of copper or other metal of
?anges E2 of members Hi. Plates 28 and
which the bus bars are made can be substan
tially less than that required for bus bars of the
56] are of the same construction and are asso
ciated with longitudinal members ill in the same
same rating in an enclosed duct, since the said
bus bars run cooler for the same current-carry
way except that, as stated, plates 35 are welded
to members it while plates 28 are removably 10 ing capacity than an enclosed duct. Further, it
secured to said members by screws 32 or in any
will be understood that the decrease in the re~
other suitable way. Accordingly, a more de
quired size of the bus bars also results in a sub
tailed description of plate 28 will also apply to
stantial reduction in the size of the longitu
plate 35. Each of said plates has a rectangular
dinal members 12 as compared with the size of
opening 3% in which the peripheral lip 36 of 15 said members in an enclosed duct, and in addi
tion, it will be understood that whether or not
the companion block 22 is received, the outer
surface 38 of the block projecting slightly be
the bus bars are of the same size in comparison
with bus bars of equal current rating in an en
yond the outer surface 40 of the plate surround
ing opening 34 therethrough. A felt cushioning
closed duct, a further reduction in the quantity
member 42 is disposed between the peripheral 20 of the metal is effected in the construction of
shoulder 44 of the insulation block and the inner
the duct itself.
surface of plate 23, .and end portions 46 of the
It will be understood that when the duct is in
felt member are disposed between the Opposite
stalled, it will comprise a plurality of connected
ends of block 22 and the adjacent surfaces of
adjacent lengths or duct sections, only one of said
longitudinal members l0, respectively. Each of 25 lengths or duct sections being illustrated in Fig.
the plates 23 and 30 extends transversely of the
1. For this purpose, adjacent lengths of duct
duct and when secured to longitudinal members
can be easily connected to each other by the
Ill hold the latter rigidly in duct-de?ning posi
splice plates 62, illustrated in Figs. 1 and 2, said
splice plates being secured to adjacent longi
tion. Preferably, each of said plates is provided
with end flanges 43 which abut the adjacent lips 30 tudinal members In in any suitable way as by a
16 and it‘ of ?anges I2 or M of longitudinal
members Hi and aid in holding the latter against
plurality of screws 64. Also it will be understood
that the bus bars 20 are approximately of the
movement away from each other. Also, as here
same length as the section of bus duct within
shown, each of plates 23 and 3D is provided with
which said bars are positioned and for facili
integral lateral extensions 50 pressed inwardly to 35 tating ‘the electrical securement of the bus bars
lie between walls I 5 of members Ill with their
of one section to the bus bars of an adjacent
outer surfaces in the plane of outer surfaces of
section, said bus bars are each provided at one
adjacent ?anges I2 or M of longitudinal mem
end thereof with off'set portions 65 for the
bers l0 and with their ends in engagement with
securement thereto of the adjacent ends of bus
the confronting walls, respectively, of said longi 40 bars 20 positioned in the adjacent duct section.
tudinal members, thus holding the latter against
Access to the duct for connecting the bus bars
movement toward each other.
20 of adjacent sections to each other can be
In view of the above description, considered
readily had by removing the plate 52 at that
with reference to the drawing, it will be ‘under
part of the duct.
stood that the interior of the bus-duct is open 45 While we vhave shown and described the pre
to the ambient atmosphere at the spaces between
ferred embodiment of our invention, it will be
the longitudinally spaced plates 28 and 30 at,,the
understood that the latter may be embodied
opposite sides of the duct, whereby the heat gen
otherwise than as herein shown or described and
erated by the current ?owing in bus bars 20 is
that in the illustrated embodiment certain
more effectively radiated and dissipated than in
changes in the details of construction and in
the case of bus bars in an enclosed duct. Pref
the arrangement of parts may be made without
erably, however, perforated guard plates .52 are
departing from the underlying idea of the pres
disposed in the spaces between adjacent plates
ent invention. It will be understood further
28 at one side of the duct and between the plates
that while the use of guard plates 52 is pre
30 at the opposite side of the duct. Said plates
lerred, said plates can be omitted. Also, it will
are preferably formed of expanded sheet metal,
be understood that plates 52 need not be made
as illustrated, and secured to longitudinal mem
of metal, but can be formed of other materials,
bers H] with the opposite ends of each plate 52
for example, ?bre board, perforated to provide
overlapping the adjacent lateral extension 50
the ‘openings therethrough for opening the in
of the adjacent plate 28 or 30, as the case may 60 terior of the duct to the ambient atmosphere.
be. The outer surface of plate 52 is preferably
Also, it will be understood that when plates 52
substantially ?ush with the outer surface 40 of
are made of metal and are, in that case, pref
adjacent plates 28 or 3H. Plates 52 are pro
erably formed of expanding sheet metal, said
vided with inturned flanges 54 and 56 which abut
plates can be otherwise provided with a multi
the adjacent lips l6 and i8 of longitudinalmem 65
plicity of perforations or openings therethrough
bers H7, and flange 56 is provided with a lip 58
to allow communication of the interior of the
which underlies the adjacent ?ange 16 or l8, as
duct with the ambient atmosphere externally
the case may be, for holding one end of plate 52
thereof and at the same time to constitute a
in position while the other end thereof is remov
ably secured to ?anges [2 or M, as the case 70 guard for the bus bars within the duct. Finally,
it will be understood that other parts of the duct
may be, in any suitable way as by screws 60. ‘It
may vary in respect to various details of con
will be understood that plates 52 can be easily
struction. Accordingly, we .do not wish to be
removed from the duct by unfastening screws 60
limited to the construction as herein speci?cally
and that said plates can be easily secured to the
duct by engaging lips 58 over the edges of lips 75 shown or described except to the extent which
2,407,142
may be required by the scope of the appended
claims.
'
Having thus described our invention, what we
claim and desire to secure by Letters Patent is:
1. A plug-in bus-duct comprising a pair of Ion
of the duct, a. plurality of longitudinally spaced
transverse members extending between said 1on
gitudinal members and secured thereto at the op
posite side of the duct, said plates having later
gitudinal members secured in laterally spaced 5 ally projecting portions extending between and
having their opposite ends in engagement with
parallel relation, said members having outward
said confronting wall surfaces, respectively, to
ly projecting ?anges at their longitudinal side
prevent movement of said longitudinal members
edges, the ?anges at one side of the duct lying in
a plane parallel to the ?anges at the opposite 10 toward each other, and a plurality of bus bars
supported in position in the space between said
side of the ‘duct, a plurality of longitudinally
longitudinal members and transverse members
spaced transverse members disposed at each of
at the opposite sides of the duct, the interior of
said sides of the duct and secured to said ?anges
the duct being open to the ambient atmosphere
at the same side of the duct, said transverse mem
externally of the duct through the spaces between
bers having plug-receiving openings, said trans
verse members at one side of the duct being lat
erally offset from said transverse members at the
opposite side of the duct, and insulation mem
15 said transverse members.
4. A plug-in bus duct comprising a pair of lon
gitudinal members disposed in laterally spaced
parallel relation, a plurality of plates disposed
bers positioned in the duct in longitudinally
at opposite sides of the duct in spaced relation
spaced relation between said longitudinal mem
20 longitudinally thereof and individually secured
bers for supporting a bus bar in the duct with
at their opposite ends to said longitudinal mem
the ?at face of the bar in a plane at right angles
bers, respectively, for securing said members in
to the plane of said openings for engagement by
said relation, bus bars in the space between said
the plugs projected into the duct through said
longitudinal members, said plates having open
openings, certain of said insulation members be
ing positioned adjacent one of said sides of the 25 ings for receiving branch-outlet plugs projected
through said openings for electrical connection
duct and spaced from the opposite side of the duct
with said bus bars, and insulation blocks dis
inwardly thereof and the other insulation mem
posed between said longitudinal members and
bers being positioned adjacent said opposite side
engaging said plates in said openings, respec
of the duct and spaced from said one of the sides
tively, and thereby releasably held against
of the duct inwardly thereof whereby the duct
movement longitudinally of the duct, said bus
has a continuous opening therein longitudinally
bars engaging said blocks and thereby held in
of the duct, the interior of the duct being open
position and said blocks having openings through
to the ambient atmosphere externally of the duct
which said bus bars project and which register
at the opposite sides thereof through the spaces
with said plate openings, said plates having in
between said transverse members.
wardly offset lateral projections, and guard
2. A plug-in bus-duct comprising a pair of
plates mounted on said longitudinal members in
longitudinal members disposed in laterally spaced
the spaces between said ?rst mentioned plates
parallel relation, a plurality of longitudinally
spaced transverse members extending between 40 and having their opposite end portions overlap
ping said lateral projections of adjacent plates.
said longitudinal members at each of two oppo
5. In a bus-duct, a longitudinally extending
site sides of the duct and connecting said lon
duct in which the buses are positioned, said duct
gitudinal members and holding them in said re
comprising a pair of longitudinal members dis
lation, said transverse members being provided
posed in laterally spaced relation, each of said
with plug-receiving openings, and insulation
members positioned in the duct in longitudinal 45 members having a main wall and flanges pro
jecting outwardly from said main wall at the
ly spaced relation between said longitudinal
opposite edges thereof, said main walls of the two
members for supporting a bus bar in the duct
longitudinal members being in confronting sur
with the flat face of the bar in a plane at right
angles to the plane of said openings for engage 50 face relation, and a plurality of plates disposed
at the opposite sides of the duct in spaced rela
ment by the plugs projected into the duct
tion longitudinally thereof, and secured at their
through said openings, certain of said insulation
opposite ends to the adjacent ?anges, respective
members being positioned adjacent one of said
ly,
of said longitudinal members, said plates hav
sides of the duct and spaced from the opposite
ing laterally projecting portions extending be
side of the duct inwardly thereof and the other
tween and having their opposite ends in engage
insulation members being positioned adjacent
ment with said confronting wall surfaces, re
said opposite side of the duct and spaced from
spectively, to prevent movement of said longitu
said one of the sides of the duct inwardly there
dinal members toward each other, said plates
of whereby the duct has a continuous opening
having ?anges at their opposite ends engaging
therein longitudinally of the duct, and perforat
ed plates secured in position at the opposite sides 60 the ends of adjacent ?anges, respectively, of said
longitudinal members to hold the latter against
of the duct in the spaces between said longitudi
movement away from each other.
nally spaced transverse members at the same
6. In a bus-duct, a longitudinally extending
side of the duct, the interior of the duct being
duct in which the buses are positioned, said duct
open to the external ambient atmosphere
through the perforations of said plates in the 65 comprising a pair of longitudinal members dis
posed in laterally spaced relation, each of said
spaces between said transverse members.
members having a main wall and ?anges project
3. A bus-duct comprising a pair of longitudinal
ing outwardly from said main wall at the oppo
members disposed in laterally spaced relation,
site edges thereof, said main walls of the two
each of said members having a main wall paral
lel to the main wall of the other longitudinal 70 longitudinal members being in confronting sur
member and in confronting surface relation ‘ face relation, and a plurality of plates disposed
at the opposite sides of the duct in spaced rela
thereto, a plurality of longitudinally spaced
tion
longitudinally thereof, and secured at their
transverse members extending between said lon
opposite ends to the adjacent ?anges, respective
gitudinal members and secured thereto at one side
75 ly, of said longitudinal members, said plates hav
moans
7
ing laterally projecting portions extending be
8
ment away from each other, and guard plates
mounted on said longitudinal members in the
tween and having their opposite ends in engage
spaces between said ?rst mentioned plates and
ment with said confronting Wall surfaces, respec
having their opposite end portions overlapping
tiveiy, to prevent movement of said longitudinal
members toward each other, said plates having 5. the lateral projections of adjacent plates.
flanges at their opposite ends engaging the ends
LOUIS
COLE.
of adjacent ?anges, respectively, of said longitu
HELGE JENSEN.
dinai members to hold the latter against move
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