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Gct. 3, 1946.
'
.
J. 5. SWANN
2,409,079
RAILWAY ‘CAR ROOF ‘STRUCTURE
Filed April 2,‘ 1945
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J. 5.‘ SWANN
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2,409,079
RAILWAY cm ROOF STRUCTURE
Filed April 2, 1945
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BY
Patented Oct. 8, 1946
' 2,409,079
UNITED STATES PATENT OFFICE
2,409,079
RAILWAY CAR ROOF STRUCTURE
James S. Swann, Homewood, Ill., assignor to
Standard Railway Equipment Manufacturing
Company, Chicago, 111., a corporation of Dela
ware
Application April 2, 1945, Serial No. 586,090
5 Claims. (01. IDS-5.4)
I
The invention relates to roofs for railway cars
wherein a plurality of metallic roof sheets ex
tend between the opposite side walls of the car
and are formed to provide integral beams or re
inforcements to transpose the load imposed there
on to the side walls of the car.
Such sheets are
frequently joined together along their meeting
edges or margins to provide additional beams or
reinforcements.
2
tangularity of the car superstructure by resisting
the tendency of the side walls to spread or come
toward each other when the car is in service.
These stresses are quite severe under coupling
shocks. Such tendency puts beam stresses upon
_the aforementioned beams or reinforcements.
In the drawings:
' Fig. 1 shows a cross section of a railway car
having a typical roof to which the invention is
The invention is an improvement on a type 10 adaptable. It also shows my embossment in the
roof sheet.
of such roof now in general use, wherein the ad
Fig. 2 is an enlarged section on line 2-2 of Fig.
jacent margins of adjacent sheets are offset up
1 showing a joint between the sheets.
wardly and such offset margins are provided with
upwardly projecting ?anges and the ?anges of
Fig. 3 is a cross section of another roof to which
adjacent sheets are secured together by a cap
my invention is adaptable, wherein the ?anges of
or welding material. The o?set portions of ad
adjacent sheets are secured together by a cap.
jacent sheets and ?anges (and cap if used) co
The roof sheet is also formed with a panel in the
operate to form a reinforcement or beam between
middle of the sheet.
the side walls of the car. Such roof sheets are
Fig. 4 shows a part of a roof sheet adjacent the
generally also each formed with an upwardly
apex and adjacent the offset margin with the
projecting panel which is preferably midway be
embossment formed in the sheet.
tween the o?set portions and extends between
Fig. 5 is similar to Fig. 4 with the embossment
opposite side walls of the car so as to provide an
omitted.
other beam or reinforcement between the side
Fig. 6 shows a part of a roof sheet adjacent the
walls.
apex, which sheet is formed with a panel and my
Such roofs are necessarily pitched from oppo
embossment.
site sides of a central ridge to provide water sheds.
In the form of the invention shown in Figs. 1,
The ridge may be formed by bending the roof
2 and 4 each roof sheet 2 comprises a main por
sheets on a line to form an apex, which apex
tion 3 and an o?set marginal portion 4 in a plane
may be eased by a radius, or the sheets may be 30 substantially parallel to the main portion, and an
arched from side wall to side wall on a large
inclined web 5 connecting the main portion 3 and
radius.
the o?set portion 4. The offset portions 4 are
The object of the invention is to provide means
joined to the adjacent roof sheet in any conven
so that a roof sheet having parts thereof in spaced
ient manner, such as upstanding ?anges 6 welded
substantially parallel planes connected by a web 35 together (7) , as shown in Fig. 2.
may be bent over a line or radius substantially
normal to the web or transversely of the sheet
without seriously concentrating the internal
strains set up by such bending at one place or a
small region. In other words, the object is to dis
perse or distribute the strains over a large area
of the sheets. Such internal strains may crack
the plate or crack the galvanization, or other
coating, while the sheet is being bent, or such
Fig, 5 shows a roof sheet having a raised margin
4 bent to form a ridge 9 (but not having my em
bossment) to show that when such a roof sheet
is bent on a line (9) or radius the metal is com
pressed and disrupted in the neighborhood of
the points II and 52 because in that region the
sheet is simultaneously bent on two lines at right
angles to each other. Actual practice shows that
strains may cooperate with stresses imposed on 45 in service roof sheets sometimes do crack in this
region.
the sheet after it is in service to crack the sheet.
My invention comprises forming an embossment
My invention is especially adapted to thin
(as shown as 20 in Fig. 4) which springs from the
metallic coated sheets, as thin sheets tend to
main portion 3 of the sheet on opposite sides of
buckle or tear when formed between reciprocal
dies, and furthermore, such action tends to crack 50 the ridge 9 and merges into the web 5 on oppo
site sides of the ridge 9, thus materially reducing
a. coating, such as galvanization, therefore, an
the angularity (2|, Fig. 2) between the main por
other object is to provide a roof sheet which can
tion 3 of the sheet and the web 5 and and conse
be manufactured of very thin metallic sheet with
quently eliminating the sharp bends shown as
out localizing the strains.
The roof of a railway car must preserve the rec 55 H and 12 in Fig. 5. Preferably the embossment
2,409,079
3
4
20 also merges into the offset portion, as shown
l. A car roof sheet of thin metallic material
in Fig. 4.
having a main portion, an offset portion in a
The ridge 25 of the embossment 20 is connected
plane substantially parallel to said main portion,
to the main part 3 and the web 5 of the portions
and a, web connecting said portions, said portions
26, as shown in Fig. 4, which portions 26 are made ‘IR and said web being bent to form a ridge extend
wide enough and long enough to distribute the
ing transversely of said sheet, said sheet formed
strains as heretofore mentioned.
with an embossment springing from the ridge of
On the line |4—-l5 of Fig. 4 and line I~B-—I'l
said main portion and merging with the adjacent
of Fig. 5 the Web 5 has an inclination of about 60
degrees (2| , Fig. 2) from the main portion 3 bf
10 '
the roof sheet, In my improved roof sheet hav
ing the embossment 20 formed therein the in
clination at the ridge 9 is decreased so that the
angularity (22) between the main part 3 ‘and the
ridge 25 of the embossment is materially de
creased, thus distributing the strains, due to
bending the roof sheet to form a ridge, and pre
venting the concentration of the strains at points
ll and/or 12. In other words, localization is pre
vented.
20
edge of the ridge of the oifset portion and merg
ing into said main portion and web on opposite
sides of said ridge.
2. A car roof sheet of thin metallic material
having a main portion, an offset portion in a
plane vsubstantially parallel to said main portion,
3! formed therein incorporating my improvement.
This panel extends between the side walls of the
and a web connecting said portions, said portions
and said web being bent to form a ridge extend
ing transversely of said sheet, said sheet formed
with an embossment extending from an edge of
the ridge of the offset portion across said web
and merging into said main portion and said web
on opposite sides of said ridge.
3. A car roof sheet of thin metallic material
having a. main portion, an offset portion in a
car and constitutes a beam between said walls.
plane substantially parallel to said main portion,
Figs. 3 and 6 show a roof sheet having a panel
In this modi?cation the sheet comprises main 25 and a web connecting said portions, said portions
portions 3!], panels 3| connected by webs 32, all
and said web being bent to form a ridge extend
of which are bent across a line forming the ridge
ing transversely of said sheet, said sheet formed
33. The embossment 34 has a ridge 35 connected
with an embossment which springs from said
to the main part 30 and the web 32 by the portion
main portion on opposite sides of said ridge and
36, all similar to the embossment 2U heretofore v30 merges into said web adjacent opposite sides of
described.
the ridges thereof.
While I have shown in the drawings the sheet
4. A roof sheet as de?ned in claim 3 wherein
formed in a plurality of ?at planes connected by
said embossment extends to and merges into the
sharp angles for simplicity, it is understood that
adjacent edge of the ridge of said oifset portion.
the various parts may be formed on curves con 35
5. A metallic roof sheet having ends adapted
nected by radii and still come within the scope of
to :be supported by the side walls of a railway
the invention.
car; said roof sheet having a panel formed there
Also while I have described the invention as
in extending substantially between the ends of
applicable to a roof sheet it is obvious that the
the sheet to provide a beam between the side walls
same could be employed in any sheet wherein 40 of the car, said panel comprising an offset por
similar conditions exist and wherever used.
tion connected by webs to the sheet, said sheet
The accompanying drawings illustrate the pre
and said panel being bent to form a ridge extend
ferred form of the invention, though it is to be
ing transversely of said sheet, said sheet being
understood that the invention is not limited to
formed with an embossment on each side of said
the exact details of construction shown and de
panel, each embossment springing from the ridge
scribed, as it is obvious that various modi?cations
of said sheet and merging with the adjacent edge
thereof, within the scope of the claims, will occur
of the panel and also merging into said sheet and
to persons skilled in the art.
web on opposite sides of said ridge.
I claim:
JAMES S. SWANN.
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