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Патент USA US2110743

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March 8, 1938.
R. W.. SHOEMAKER
2,110,743
BUS-BAR
Filed May 29, 1935
2 Sheets-Sheet 2
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Patented Mar. 8, 1938
2,110,743 y
PATENT ort-‘ICE
` UNITED STATES
z,11o,'143
~
'BUS-BAR
Richard W. Shoemaker, Woodbury, Conn., aS
signor to The Chase’ Companies, Incorporated,
Waterbury, Conn., a corporation
Application May 29, 1935, `Serial No. 24,061
(Cl. 173-13)
gral tubular bus-bar having slot-like ventilating
bus-bars, and particularly to bus-bars of tubular ports; and
U
2 Claims.
This invention relates to an improvement in
form in cross-section.
Fig. 7 .is a transverse sectional view taken on
the line iI-II of Fig. 10.
`
In alternating-current bus-systems, lthe walls
5 of the tubular bus-bars aresubjected to very
The particular bus-bar 20 illustrated in Figs. Cri
1 to 5 inclusive of the accompanying drawings is
of rectangular form in cross-section and includes
high collapsing strains, especially under short»
circuit conditions. 'In a 60-cycle alternating
current system, the collapsing force would be of a iiat top-wall 2 l, a iiat bottom-wall 22 and com
a pulsating or vibratory character exerted 120ß plementary flat side-walls 23 and 24, all of which
10 times per second.
Composite bus-bars, as gen- `‘i are formed integrally. 'I‘he bus-bar is preferably
erally heretofore made, have required that their
component parts be securely clamped together
at short intervals, but, owing tothe mechanical
vibrating eil’ect of the current passing there
15 through, such fittings have been 'susceptible to
loosening under the vibrating force which under
of drawn copper or other metal of high electro
conductivity. ,
is formed with a longitudinal series of spaced
some conditions may rise as high as 5,000 lbs. per
linear foot of bus-bar.
'
Adjacent its point of juncture with the inte
gral side-wall 24, the top-wall 2l of the bus-bar
„
apart air-egress ports 25, each of which is sepa--I
rated from its neighbor by an integral web .26*
completing the one-piece perimeter of the said
One of the objects of the present lnventionis" ports.
to provide a ventilated tubular bus-bar which
The bus-'bar is also formed in its bottom-wall
will be substantially proof against the disinte
22 with a longitudinally-extending series of air
grating effects of the vibratory stresses set up by ingress ports 26 which are located longitudinally
heavy currents flowing therethrough.
intermediate the air-egress ports 25 and also
A further object is to provide a ventilated tubu
laterally displaced with respect to the latter, >so
as to be located adjacent the junction point of
25 lar bus-bar having superior rigidity.
Another object is to provide a tubular bus-bar the said bottom-wall 22 with its integral side-wall
`in which the character of the Ventilating-means 23. Like the ports 25, the air-ingress ports 26
is such as to have a minimum eiïect upon the are separated from each other by integral webs
conductivity of the bus-bar.
26", the ends of which latter>` complete the inte
A still further object of the present invention gral walls of the said ports 26.
30
30
is to provide an arrangement whereby the bus
As the bus-bar becomes heated due to the
bar will be effectively cooled by air-currents passage of an electric current therethrough, air
without unduly reducing its conductivity or i
will be drawn, by convection, inwardly through
mechanical strength.
`
the air-ingress ports' 26 in the bottom-wall 22
a - With the above and other objects in View, as and will flow both longitudinally and laterally,
will appear to those skilled in the art from the and will ultimately exit upwardly through the
following, considered in conjunction with the air»egress ports 25 in the top-Wall 2|, as indicated
accompanying drawings and appended claims, particularly well in Figs. 3 to 5 inclusive.
By the staggered relationship of the air-ingress
the present invention includes all features within
ports 26 and the air-egress ports 25, a maximum
40 the range of the said claims.
In the accompanying drawings:
A
Fig. 1 is a broken plan view of a portion of a
bus-system composed of bus-bars embodying the
present invention;
45
_
Fig. 2 vis a broken perspective view of one
form which a tubular integral ventilated bus-bar
may assume in accordance with the present in:1
Fig. 3 is a longitudinal sectional view thereof,
taken on the line 3--3 of Fig. 2;
Fig. 4 is a transverse sectional view taken on
the line 4--4 of Fig. 2;
Fig. 5 is a similar view taken on the line 0-5
55
air entering through the ingress-ports 26 is forced
to travel both longitudinally and laterally before
it can escape from the interior of the bus-bar,
thus wiping, so to speak, a maximum mount of
the internal surface of the tube.
~-
Furthermore, by staggering the egreM-ports ‘25
vention;
of Fig. 2;
cooling effect is obtained with a minimum amount
of cutting away of the metal, inasmuch as the
`
_
Fig. 6 is a broken perspective View of an inte
and the ingress-ports 26 longitudinally with reu
spect to each other, the conductivity of the bus
bar
the case
is cutwere
down
the
tosaid
a lesser
portsextent
located
than
transversely>
would
‘
in line. In other words, despite the fact that the
tube is perforated both top and bottom,
.con
ductivity of the tube at any given transverse
2,110,743
point is cut/down only by the amount of metal
removed by the production of but one port. The
mechanical strength of the bus-bar is also least
affected by the staggering of~ the ports, as de
scribed.
`
When heavy alternating currents are ñowing
through the bus-bar, the webs 25* and 26* effec
tively prevent relative movement between the
metal on the respective opposite sides of the ports
10 25 and 26, thus obviating one of the objections
inherent in. prior bus-bar structures.
In Figs. 6 and 7 is shown an integral drawn
tubular bus-bar 3l, also of rectangular form in
cross-section and including a top-wall 35, a
bottom-wall 3B and complementary side-walls 31
and 3|, all formed integrally with each other.
Instead of perforating the top- and bottom
walls, the bus-bar 34 is perforated in its side
walls in staggered relationship. Thus, the side
wall 31 is provided with a series of longitudinally
extending slot-like air-egress ports I9, located in
the said> side-wall adjacent the point of the
junction of the latter with the top-wall 35 and
having `interposed between them lintegral webs
25 3P. At a materially-lower level than the level
of the ports n, the wall Il of the bus-bar is
formed with a series of longitudinally-extending
slot-like air-ingress ports 4I, preferably located in
the said side-wall at point adjacent the junction
30 of the latter with he integral bottom-wall 36
and spaced from each other by integral webs Ml.
By reference to Fig. 7 in particular, it will be
seen that the egress-ports 30 and the ingress
ports 4I, by virtue of their vertically-staggered
relationship, cause air entering the said ingress
ports 40 to wipe against a large area of the
interior surface of the tube before escaping
through the egress-ports 39.
It will be noted that while a given pair of the
40 ports I9 and ll are vertically staggered in dis
placed relationship with respect to each other,
they are substantially laterally in line, and for
this reason it is preferred to secure the necessary
'I'he invention may be carried out in other
specific ways than those herein set forth with
out departing from the spirit and essential char
acteristics of the invention, and the present em
bodiments are, therefore, to be considered in all
respects as illustrative and not restrictive, and
all changes coming within the meaning and
equivalency range of the appended claims are
intended to be embraced therein.
I claim:
10
l. A one-piece wrought tubular bus-bar de
signed and adapted for current-carrying bus
systems and composed of high electro-conductive
metal and of rectangular form Vin cross-section
and having substantially-flat integral top-,
bottom- and side-walls; the said rectangular bus
bar being formed in a lower wall-portion with a
longitudinal series of spaced-apart air-ingress
ports, and also formed in an upper wall-portion
with a longitudinal series of spaced-apart air
egress ports, the individual air-ingress ports bc
ing separated from others of the series thereof
by webs of metal formed integrally with the
metal of the rectangular bus-bar, and the in
dividual air-egress ports of the series thereof be 25
ing also separated from companion ports by in
tegral webs; certain of the said series of air
ingress ports’being located laterally intermediate
the longitudinal center-line of the upper-wall
portion of the bus-bar and a side-edge of such
wall portion and laterally staggered with respect
to certain of the said series of air-egress ports
and the staggered relationship being such that
the upper-wall portion of the bus-bar is substan
tially solid in the areas immediately above the 35
said ingress-ports, thus causing air entering the
former to wipe laterally across the interior sur
face of the rectangular bus-bar before exit
through air-egress ports.
2. A bus-bar system .comprising a plurality of 40
one-piece wrought tubular bus-bars and com
posed of high electro-conductive metal and of
rectangular form in cross-section and having sub
stantially-flat integral top-, bottom- and side
walls; the said rectangular bus-bars being formed 45
port area by making the said ports of slot-like
form extending longitudinally of the bus-bar, so
that the reduction in cross-sectional area of the
bus-bar at a given point is kept at a minimum.
of spaced-apart air-ingress ports, and also
in a lower wall-portion with a longitudinal series
All of the bus-bars herein illustrated are ex
formed in an upper wall-portion with a longi
tremely economical of installation and effective
in operation, owing largely to the integral char
acter of the structure. Thus, especially under
tudinal series of spaced-apart air-egress ports,
the individual air-ingress ports being separated
short-circuit conditions, the pulsating collapsing
formed integrally with the metal of the rectangu
lar bus-bar, and the individual air-egress ports
of the series thereof being also separated from
forces (which are applied and released 120 times
per second in a 60-cycle system) have no effect
55 in loosening one wail with respect to another.
Furthermore, by the integral character of the
webs between any given pair of ports of the same
series, not only is -superior mechanical strength
obtained, but clamping-fittings, usually required
in great numbers, may largely, if not entirely, be
dispensed with.
It will be obvious, without further illustration,
that the various ports may be of 'various shapes
and spacings. Bus-bars of rectangular form in
cross-section are much to be preferred in present
practice, for the reason that they provide suit
ably-located flat faces against which connecting
plates for branches (both vertical and horizon
tal) may be secured.
froml others of the series thereof by webs of metal
companion ports by integral webs; certain of the
said ports being located laterally intermediate the
longitudinal center-line of the upper-wall portion
of the bus-bar and a side-edge of such wall por
tion and staggered relative to others of said ports
in directions both laterally and longitudinally of
the bus-bar and the staggered relationship being
such that the upper-wall 'portion of >the blu-bar
is substantially solid in the areas immediately
above the said ingress-ports, thus causing air
entering ingress ports to travel both laterally and
longitudinally through the interior of the
rectangular bus-bar and exit through air-egress
ports.
RICHARD W. SHOEMAKER.
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