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Патент USA US3025055

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March 13, 1962
M. N. ORNITZ
3,025,045
FURNACE TRAYS
Filed Sept. 10, 1958
2 Sheets-Sheet 1
F ig.l.
Fig.2.
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F ig.3.
INVENTOR.
Martin N. Omiiz
BY
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zQtZ M
A ATTORNEYS‘
March 13, 1962
M. N. ORNITZ
3,025,045
FURNACE TRAYS
Filed Sept. 10, 1958
2 Sheets-Sheet 2.‘
E9. 4.
INVENTOR.
‘
Martin N. Ornitz
A;
ATTORNEYS.
Unite I States Patent O?lice ,
_
3,025,045
Patented Mar. 13, 1962
1
2
FIGURE 1 is a top plan View of a furnace tray ac
3,025,045
FURNACE TRAYS
Martin N. Ornitz, Wilkinsburg, Pa., assignor to Blaw
cording to my invention;
FIGURE 2 is a side elevation of the tray of
FIGURE 1;
Knox Company, Pittsburgh, Pa., a corporation of Del
aware
FIGURE 3 is an end elevation of the tray of
Filed Sept. 10, 1958, Ser. No. 760,267
5 Claims. (Cl. 263-47)
FIGURE 1;
7
FIGURE 4 is an isometric view of a segment of the
tray of FIGURE 1; and
This invention relates to furnace trays and particular
FIGURE 5 is a segmental section on the line V—V of
ly to trays for carrying articles to be annealed or heat 10
FIGURE 1.
treated through annealing or heat treating furnaces, as,
Referring to the drawings, I have illustrated a furnace
for example, continuous furnaces having doors at each
end and rails or rollers therein to support and carry the
tray having a plurality of spaced substantially parallel
new tray and to remove the ?nally heated tray.
offset portion 1112 so as to form an L-shape. A plurality
primary or load bearing elements 10, each having spaced
trays bearing the articles to be treated for passage
through the furnace. The trays may be moved through 15 slots or openings 11 therein. Each slot 11 is provided
with a wider main portion 11a and a narrower adjacent
the furnace in series, the doors being opened to admit a
Gen
of spaced substantially parallel cross elements 12 are
inserted in the slots 11. The cross elements 12 are
or an air quench. The trays are thus subject to severe
thermal shock and are likely to fracture due to the high 20 inserted through the wider‘main portion 11a of slot 11
until notches 13 in cross elements 12 overlie the
thermal stresses which occur in the several parts of the
narrower otfset portion 11b of slot 11. The cross ele
tray. My construction is also useful for immovable work
ments 12 then drop downwardly so that the notch 13
supporting trays in other types of heat treating furnaces.
is in engagement with the step ‘110 forming the narrower
Annealing and heat treating trays have heretofore been
used. Such trays are generally made in the form of a 25 offset portion 11b of the slot. A short bar 14 is in
grill or a grating integrally cast of a heat resisting steel.
serted in the wider main portion 11a of the slot 11 and
Such trays are very susceptible to failure due to the afore
is welded in place to act as a keeper for the cross ele
mentioned thermal shock. Modi?cations of such in
ments 12. The cross elements 12 are thus held in inter
tegrally cast structure have been proposed in which inter
locking relation in the load bearing elements but are
secting members may move differentially in an effort to 30 free for movement within the smaller portion offset 11b
of the slot 11.
overcome the problem of failure from thermal shock.
For example, Menough Patent 2,710,746 provides a con
In the embodiment shown in the drawings the load
struction in which the intersecting members are not rigid
bearing elements 10 are generally symmetrical in sec
erally, the trays leaving the furnace pass through a water
ly secured together.v
tion with the slots 11 spaced substantially along their
The present invention provides a structure differing 35 neutral axes, so that the trays are bodily reversible and
from the prior art structures and having a unique articu
either side may be the load supporting side. In service
lated construction of simple, effective, inexpensive form
they are reversed from time to time as de?ections and
relatively free at the joints between the members. In the
sags develop due to creep of the alloy material of which
present invention, the members are free to independently
they are made, and in such reversed position the trays
undergo such thermal de?ection as may be imposed on
are self-straightening with respect to deflections formed
them in service, yet the structure is strong, durable,
while in their original position. This feature is pre
simple and easy to assemble, so that the cost is low.
ferred in most cases but my articulated tray construc
I provide a plurality of spaced substantially parallel pri
tion is not limited to use with symmetrical elements or
mary elements, each having openings therethrough, a
reversible trays.
plurality of spaced substantially parallel cross elements 45
It will be understood that, while I have illustrated and
disposed transversely to the primary elements and ex
described a presently preferred embodiment of my in
vention, the invention may be otherwise embodied with
cross elements being notched at spaced intervals along
in the scope of the following claims.
their lengths whereby the notches engage portions of the
I claim:
primary elements adjacent the openings therein, and 50 1. A furnace tray comprising a plurality of spaced sub
keeper means secured in some of said openings whereby
stantially parallel primary elements, each having openings
the cross elements are restrained from substantial ver
therethrough each of said openings having a main por
tical movement and hence are held in ?xed relationship
tion and an offset portion on one side thereof, a plurality
with the primary elements.
of spaced substantially parallel cross elements disposed
Preferably, the keeper means are secured in at least 55 transversely to the primary elements and extending
two of the openings for each cross element whereby the
through the openings in the primary elements, the cross
elements are substantially restrained from vertical move
elements being notched at spaced intervals along their
ment. The slots are preferably wider at a portion thereof
lengths, said cross elements being so disposed that the
whereby the cross tie elements may enter initially through
notched portions of the cross element lie in the offset
such wider portion and then ?t within the narrower por
portions of the openings and the notches engage portions
tion with the notches in the cross tie elements embracing
of the primary elements adjacent the openings therein,
a portion of the sides adjacent the slots of the narrower
and keeper means whose length is short of and out of
portions in loose interlocking engagements, and the keeper
contact with the next adjacent primary elements and which
tending through the openings in the primary elements, the
means is secured in at least two of the wider portions of
are free of the cross elements secured in some of said
the slots.
65 openings to retain the notches in engagement with the
In the foregoing general description, I have set out
primary elements, whereby the cross elements are re
strained from removal from the openings and are simul
certain objects, advantages and purposes of the present
taneously free to move in loosely ?tting ?xed relationship
with the primary elements.
scription and the accompanying drawings illustrating a 70 2. A furnace tray comprising a plurality of spaced sub
stantially parallel primary elements, each having slots
preferred embodiment in which
invention. Other objects, advantages and purposes will
be apparent from a consideration of the following de
therein at spaced intervals, said slots each having a main
3,025,045
portion and an offset portion on one side thereof, a plural
ity of spaced substantially parallel cross elements dis
posed at substantially right angles to the primary elements
and extending through the slots therein, the cross ele
ments having notches disposed at spaced intervals along
4
offset portion whereby the cross tie elements may enter
initially through the wider main portion and then drop
into the narrower offset portion as the notches embrace
a portion of the load bearing element adjacent the slots
in the narrower offset portion of the slots in a loose
interlocking engagement, and keeper means whose length
their lengths, said cross elements being so disposed that
the notched portions lie in the offset portion of the slots
and the notches interlock with the portions of the primary
elements adjacent the slots, and keeper means whose length
is short ‘of and out of contact with the next adjacent
is short of and out of contact with the next adjacent pri‘
mary elements and which are free of the cross elements
secured in the wider main portion of at least two of the
slots for each cross tie element whereby the cross tie
elements are substantially restrained from removal from
primary elements and which are free of the cross ele
ments secured in at least two of the slots for each cross
the slots and are simultaneously free to move in loosely
interlocking engagement with the load bearing elements.
5. A reversible furnace tray comprising a plurality of
element retaining the notches in engagement with the pri
mary elements whereby the cross elements are substan
spaced substantially parallel load bearing I-beams, each
tially restrained from removal from the slots and are 15 with a plurality of spaced slots disposed along the web
simultaneously free to move in loose ?tting ?xed rela
thereof, a plurality of notched spaced substantially parallel
tionship with the primary elements.
tie bars disposed at substantially right angles to said beams
and extending through the slots therein, said slots being
stantially parallel load bearing elements, each having
of generally L-shaped con?guration and wider than the
20
therethrough a plurality of slots at spaced intervals along
tie bars in an upper portion thereof and narrower than
their lengths, said slots each having a main portion and
the tie bars in a lower portion thereof, the notches in.
an offset portion on one side thereof a plurality of spaced
the tie bars being spaced along the lengths thereof at
substantially parallel cross tie elements disposed at sub
intervals substantially coincident with the slots in the
stantially right angles to the load bearing elements and
beams whereby the notches in the notched portions of
extending through the slots therein, the cross tie elements 25 the tie bars will rest in the narrower portions of the slots
being notched at spaced intervals along their lengths,
and the tie bar will embrace a portion of the I-beam
3. A furnace tray comprising a plurality of spaced sub
said cross tie elements being so disposed that the notched
adjacent the slots in the narrower portion of the slots with
the tie bars into a loose ?tting interlocking engagement
with the beams in the narrower section of the slots, and
portions lie in the offset portion of the slots and the
notches embrace the load bearing elements adjacent the
slots therein in an interlocking engagement, and keeper
keeper means whose length is short of and out of contact
with the next adjacent load bearing I-beams secured in
means whose length is short of and out of contact with
the next adjacent primary elements and which are free
the wider portion of the slots free of the tie bars in at
of the cross elements secured in at least two of the slots
least two of said slots for each tie bar whereby the tie
for each cross element retaining the notches in engage
‘bars are substantially restrained from vertical movement
ment with the primary‘ elements whereby the cross ele 35 and hence are held in a loosely interlocking engagement
ments are substantially restrained from removal from the
with the beams whereby said beams and tie bars may
slots and are simultaneously free to move in loose ?tting
?xed relationship with the load bearing elements.
4. A reversible furnace tray comprising a plurality of
spaced substantially parallel load bearing elements, each
with a plurality of spaced slots along its length, a plurality
of spaced substantially parallel cross tie elements with
notches spaced along their lengths, said cross tie elements
being disposed at substantially right angles to the load
bearing elements and extending through the slots therein,
said slots being wider at a portion thereof to form a
wider main portion and generally rectangular narrower
expand and contract independently of each other,
40
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,140,657
1,426,736
2,710,746
Benjamins __________ .__ May 25, 1915
Hess _______________ __ Aug. 22, 1922
Menough ___________ __ June 14, 1955
2,834,267
Beebe ____.___________ __ May 13, 1958
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