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Патент USA US2115416

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April 26, 1938.
Filed April 28, 1937
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Patented Apr. 26, 1938
Kenneth J. Deahl, Pittsburgh, Pa., assignor, by
mesne assignments, to Pittsburgh Annealing
Box Company, Pittsburgh, Pa., a’ corporation
of Pennsylvania
Application April 28, 1937, Serial No. 139,577
7 Claims. _ (Cl. 263-49)
My invention relates to annealingboxes and
more particularly to those formedof sheet metal.
‘One object of my invention is to provide an
annealing box of such form which for a given
5 weight or gauge of metal will have greater
strength and resistance to deformation and,
therefore, will be serviceable for a greater num
ber of “heats” than will boxes of other forms.
Another object of my invention is to provide
10 an annealing box of corrugated metal sheets
wherein there is an improved arrangement of
bracing and stiffening members so arranged as
to reinforce and prevent deformation of the cor
rugations, with consequent greater resistance to
15 any tendency of the corrugations to- spread and
The vertical channels in the side walls extend to
the bottom edge of the box and serve to give
greater area of support to the box.
The temperature changes to which the box is
subjected are, of course, very great, and the
tendency toward distortion or deformation is very
great, owing to the fact that parts of the box
become heated or cooled much more quickly than
other parts thereof.
For example, the portion
of the box disposed in the sand seal does not fol 10
low changes in temperature as rapidly as other
parts of the box, consequently the box near ‘its
bottom edge is subject to extreme diiferences in
The corrugations I3, near the bottom edge of 15
the box, are deformed or ?attened somewhat,
?atten under temperature changes and other
stresses, particularly in the zones where the ap ’ as shown more clearly at 15 in Figs. 1 and 4, to
plication of furnace heat is most intense.
produce flutes or partial folds in the walls of the
Still another object of my invention is to pro
corrugations, in order to provide for greater
vide a box wherein the zone adjacent to the bot
yieldability or ?exibility at that portion of the .
tom edge that is subjected to the greatest in
box, under temperature changes, since in many
tensity of furnace heat, is so formed as to have types of annealing furnaces, the heat of the
greater ?exibility under temperature changes burners is applied to the exterior wall of the box
than is required or desired for other portions of near its loweriedge, with consequent greater ex
the box.
pansion and contraction of the metal. It Will be
Some of the forms which my invention may understood that the extreme lower edge of the
take are shown in the accompanying drawings box which rests in the sand will become heated
wherein Figure 1 is a fragmentary side view of much more ‘slowly than that portion of the box
the box, partly in section; Fig. 2 is an end view immediately above the sand seal. On the other
thereof; Fig. 3 is an enlarged view taken on the hand, if the box is permitted to cool while still EU
line III—III of Fig. 1; Fig. 4 is a view taken on in the sand seal, the portion above the sand will
the line IV-IV of Fig. 3; Fig. 5 is a view taken cool much more rapidly than the lower edge of
on the line V—V of Fig. 3; Fig. 6 is an elevation
the box. The greater ?exibility provided in the
al view of the structure of Fig. 5, partly in sec
lower portions of the corrugations consequently
tion; Fig. '7 is a sectional plan view of the box, permits of greater relative expansion and con
taken on line VII-VII of Fig. I; Fig. 8 is an traction of the box walls at such points without
enlarged view taken on the line VIII—VIII of cracking or deforming the metal, such as so fre
Fig. '7; Fig. 9 is a view taken on the line IX—IX quently happens in the case of either ordinary
of Fig. 8; Fig_ 10 shows a modi?cation of the corrugated wall or ?at wall boxes. The sand
structure of Fig. 9, and Fig. 11 shows still an
trough l6 and the sand seal formed therein may
other modi?cation thereof.
be of any well-known arrangement; but in this
Referring first to Figs. 1 to 9, the box is con
case can be made narrower, owing to the com
structed of metal sheets or plates which are
pressed or ?attened corrugations, thus reducing
welded together at their abutting edges to pro
duce a unitary box structure having side walls the amount of sand required to effect proper seal
and thereby effecting a more rapid response to
l0, end Walls H, and a top wall £2.
The Walls of the box are so shaped as to have temperature changes between the portion of
oppositely-projecting corrugations or channels 13 the box in the sand and‘ that portion just above
the sand. In addition, by the use of the nar
and I4 formed therein that are substantially oo
extensive with the walls of the box, the channels rowed sand trough and the ?attened wall cor
in the side Walls matching the channels in the rugations, a furnace of a given size will accom-e
top wall and being in eifect continuous therewith. modate a box of a somewhat larger “charge”
These channels, of course, serve to stiffen the capacity.
structure and enable it to .be made of lighter
The side and end walls of the box have their
gauge material than would otherwise be possible. corrugations strengthened and sti?ened by box 55
. 2,115,416
like arrangements of reinforcing and stiffening
members, as hereinafter described.
In the case of the outwardly-projecting chan
nel-like corrugations I3, I vstiffen the same by
to stiffen and hold the spaced portions of the
channels 20 from excessive distortion under tem
perature changes. In practical use of these boxes, '
it has been shown that instead of the whole side ’
of a box bulging out in the form of a curve, the
the use of elements comprising a stem portion.
bulging‘ isvcon?ned to small amounts inwardly
II and aVchannel-like portion l8, which are suit
ably welded together. The stiffening members v and outwardly at the various corrugations.
i'|—|8 are of a length substantially equal to the
’ width of such corrugation or channel |3, and the
10' outer edge of the element I1 is welded to the web
of such channel.
' V
The ends of the elements I‘!
Referring now to Fig. 10, I show a structure
wherein the stiffening members for the out-'
wardly-projecting corrugations l3 may be the 10
same as above described, but in this instance I
and I8 are welded to what are'in effect the side ' provide an outer strengthening channel 'M'whose
walls of the corrugations I3, as indicated at l9. ?anges are of sufficient depth or width to engage
the exposed surfaces of the corrugations M, the
The element II is welded to the channel-like ele
15 ment |8 along a line preferably mid-way between
the ?anges of the channel, before the members
i? and I8 are welded to the corrugations. The
intermediate portions of the ?anges being cut 15
away opposite the corrugations 83. The flanges
of the channels 2d are welded to the adjacent sur~
members I] and I8 in effect constitute a shape faces of the corrugations I3 and Hi, and no‘
, stiffening plates such as 2| are required. Por
that is of generally T-form in cross section.
tions of the flanges are further cut away as in 20
On the outer side of the box, I provide'continu
ous channels 20 disposed with their flanges abut?
ting the outer surfaces of the corrugations I73 and
welded thereto. ' Reinforcing plates 2| equal in
length to the width of the corrugations M are
25 welded to the channels 20 before'the channel is,
‘secured to the box, the inner edges and ends
of, the plates 2| being welded to the web and side
walls, of the corrugations l4.
Since the ?ller plates 2| are of short length
30 and do not extend across the outermost surfaces
of the channels l3, there’ may be ?ow of heated
dicated at 425, in order to permit vertical flow of >
hot gas along the corrugations Hi.
In Fig. '11 I‘ show a structure wherein the out
wardly-projecting corrugations are braced and
strengthened by the elements 28 and 29 which
correspond to and are mounted in the same
manner as are the elements‘ l1 and i8 of Fig. 8.
In this: structure, the outwardly-projecting cor
rugations are provided withv reinforcing plates
30 and channels 3| that are substantially dupli
cates of the members H and H3 or the members,
gases upwardly along the corrugations l4, through
28 and 29.
to be exposed‘to flow of heated gases although‘
throughout the peripheryiof the box.
The members Hand 29 are preferably‘in hori- 1
paths behind the lowermost ?ange of the chan
z‘ontal alignment with'the members 39 and 3|,
nel 20, around the ends of the plates 2| and up
wardly behind the upper ?ange of the channel, ' and since each of th'e'semembers is welded at its
as indicated by the arrows in Fig. 1, thus per ends to the adjacent corrugation walls, they in
mitting all portions of the outer side of therbox' ' effects form a stiffening channel extending
reinforced by the channel and the plates 2|. '
The channels 20 not only serve to distribute
distortions of the side walls to the various vertical
corrugations, thus preventing excessive deforma
tion ‘and ?exing of only certain corrugations,
which would result in early cracking of the metal,
but by reason of their form and arrangement
they tend to restore the box to its original con
tour after each heating and cooling cycle. This
latter function occurs by reason of the fact that
the inner edges of the ?anges of channels 20 are
50 in spaced relation to- the webs of the inwardly
projecting corrugations I4, as shown more clearly
in Fig. '7. As above stated,;the heated gases ?ow
I claim as my invention:
I '
1.‘ The combination with an annealing box 40,
having corrugations formed in its walls, of stiff
ening members consisting of channels secured at
their ends to the sides of the corrugations, and
reinforcing plates disposed within said channels
and secured to the channels and to the corru
2. The combination with an annealing box hav
ing corrugations formed in its walls, of stiffening
members comprising channel-like elements, and
reinforcing elements secured to the inner sur-'
faces of the channels and to the walls of the cor-,
rugations, the reinforcing elements extending in
upwardly through the corrugations, past the in
directions parallel to the ?anges of the channel
ner edges of the channels 20, which results in
comparatively rapid heating of those portions of
3. The combination with an annealing boxhav
ing inwardly and outwardly-projecting corruga
tions formed in the walls thereof, of stiffening
members foreach of said corrugations, compris~
the channels 25 which are opposite to the corru
gations M, because such channel portions are out
of contact with the colder box surface and the
heat is not readily conducted therefrom to the
ing channel-like elements disposed within the
corrugations and secured thereto, the stiffening 60
box. The colder portions of the structure resist members positioned within the inwardly-project
the tendency of these hotter portions of the , ing corrugations being in longitudinal alignment
channel to expand under the initial heat, with with the stiffening members located within the
60 box wall nor to the metal contents within the
the result that these hotter portions are placed
65 under high compression.
outwardly-projecting corrugations.
4. The combination with an annealing bo'x hav
After an annealing operation and during the
ing vertically-extending corrugations formed in
cooling cycle,,the said spaced portions of the
its walls, of a stiffening element ‘of channel form
channels 29 will cool more rapidly than those
portions of the channels which are opposite to
70 and in contact with the corrugations l3. Conse
disposed transversely of and secured to the cor
rugations, and reinforcing plates secured to the
channel and to the box at'points between the
quently, those said spaced portions of the chan
nels will tend to contract rapidly and exert such
tensional forces as will be effective to return any
heat-distorted portions of the box back to ap
75 proximately its original form. The webs 2| serve
said corrugations.
5. The combination with an annealing box hav
ing corrugations of channel-like shape formed in
the walls thereof, of channels extending trans
versely of said corrugations and having portions 75.
7. The combination with an annealing box hav
of their edges welded to adjacent portions of the
corrugations and intermediate portions of said
edges disposed in outwardly spaced relation to
ing corrugated walls, of channels extending trans
versely of said corrugations and having portions
relatively depressed portions of the corrugations.
of their edges welded to the outermost areas of
6. The combination with. an annealing box hav
ing corrugated walls, of channels extending trans
versely of said corrugations and having portions
of their edges welded to the outermost areas of
the corrugations and other portions spaced out
10 wardly from the depressed areas of the corruga
tions, and reinforcing plates having their inner
edges secured to the said depressed areas and their
outer edges secured to the webs of the channels.
the corrugations and other portions spaced out
wardly from the depressed areas of the corruga
tions, and reinforcing plates having their inner
edges secured to the said depressed areas and their
outer edges secured to the webs of the channels,
the said reinforcing plates extending parallel to 10
the channels and ‘disposed approximately mid
way between the ?anges of the channels.
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