US1560708A - Annealing box - Google Patents

Description

F. E. MESTA ANNEALING BOX Nov. 1ol l`1925- mzifHuHHHUHHHH nw... H. u 12-11.11- Il-- l- 13, 1925 Fzl Filed Jan m 0. sa. 1 J

Patented Nov. l0, 192.5.-

7 UNITEDQSTIATES FREDERICK It MESTA, or WEST HOMESTEAD,j11EimSYLvii.-1\mi, AssIGiiion To MESTA MACHINE COMPANY, or PITTSBURGH, IHNNSYLVANIA, A CoItIoRATIoN or* PENN- SYLvANIn.

ANNEALING Box.

Application kinea January 13, 1925. serial No. 2,142. i

To all whom t may concern:

Be it known that I, FREDERICK E. 4MESTA,

- a citizen of the United States, residing at West Homestead, in the county of .Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Annealing Boxes,.of which the following is a full, clear, and exact description.

TheA present invention relates broadly to annealing boxes, and more particularly to covers of the cast type as commonly used in the art.'

At theresent time, the high requirements of manu acture as to the quality of sheets, particularly where used in automotive manufacture, `has made the question of anneal? ing boxes of prime importance.

As cast annealing boxes of the larges sizes quite-frequently weigh from 15,000 to 20,000 pounds stand,- it'will be apparent that any sof and are sold on the pound basi's, it becomes apparent that it is desirable to keep the weightas low as possible while maintaining the desiredA characteristics as to strength and durability. As the life of boxes is measured by the number of heats they can withincrease in the number of heats means a re the cost per pound of sheets annealed therein.

.It is essential to provide a box having a minimum amount of .clearance between the interior of the side walls and the edges of' the sheets with which the box is to'be used. as in this manner the amount of air tending to produce oxidation of the sheets, and the body of air tending to blanket heat transmissionv from the box to the sheets are `bothreduced. This results in a better quality sheet and enables the annealing temperature of the sheets to be reached with a lower box temperature, and consequently less damage to the box.

One of the chief difficulties with boxes as heretofore constructed has been the tendency ofthe top to sag and the sides to bulge or crack.v The bulging of the sides frequently reduces the box dimensions to such an extent that continued use-thereof with sheets of thesize -forwhich it was constructed is impossible, while cracks permit infiltration of air with resulting increased oxidation.

It is one of the objects ofthe present invent-ion to construct a -box of minimum weight, minimum clearance or air Space and maximum strength with respect to the number of heats. v v InA the accompanying drawin s there is shown, for purposes of illustration only, a

Figure 2 is-a topplan View, partly broken,`

` away and partly in section, of the box shown inFigure1;

Figure 3 is a transverse sectional view on the line III-III of Figure 1, looking in the direction of the arrows; an

Figurev 4 is. an end elevation'of the box. U5

In carrying out the present invention, there may be provided a cast body 2 having por-tions of its side, end and top walls Vdisplaced out` of the main plane of the bod to provide reinforcing ribs or swells 3. -Pre 4erably this displacement will not only be outwardly relatively-to the plane of the box body but also outwardly relatively to the interior of the bom-whereby the. relatively flat portions 4 connecting adjacent reinforcements will define the major portion of the interior walls, thereby reducing the air space to a minimum. The reinforcements 3 in the side walls are preferably continued entirely across the top 5 of the box, whereby a, continuousv reinforcement in a common transverse plane for both the side walls and the topv is provided with each of the swells. The end swells, however,.as clearlyl indi'- `cated iii Figures 2 and 4, preferably terminate at substantially the junction of the endv walls and the roof.

' At its lower edge the box coveris conven-y I iently formed with a reinforced edge or base 6 adapted to. cooperate with a box bottom,

as well understood in the art. As this portion of the box is usually protected, tofsomeV extent at least, by sand or other sealing material provided for the purpose of cutting down air leakage to a minimum, it is not subjected in use to the high temperature differences to which the remainder of thebox is subjected. For these reasons, vthe reinforcements 3 may gradually die outadja- ,-cent the bottom edge as shown in the drawglhe roof 5 vis preferably transversely arched to obtainadditional strength, tending to prevent sagging of the top during use, andthe ends may be formed with suitable hooksor projections 7, facilitating lifting of the4 cover.

I vamaware that it has heretofore been proposed to construct cast boxes having reinforcements formed by displacing a portion of the box body out of .the plane -thereof, wherebya substantially uniform thiol@ ness throughout the body and the reinforcements to obviate abrupt changes'in section is provided. Such reinforcements not only provide additional strength but serve to permit longitudinal expansion and contraction,

` as well understood in the-art. The bottom edge of such boxes ordinarily tendsto prevent any undue changes in dimension of this portion under contraction and. expansion dueto temperature changes, but after; a certain number of heats the 4top commences to the cover but alsoserving. to further st iifen the side walls. In actual use, however, un

t der the extreme tempera-turesl to "which the b oxes are subjected, .these `ribs tend' to 'fall overlaterally vagainst the sides of the reinforcements, thereby shortening their overall length'and permitting the objectionable sagging before 'referred to.

'5I have found that this saggingcan `beJ very materially reduced by the provision of short tie ribs 9 extending from the main rib to the sides of the reinforcements. It is essential,-

l however, that these tie ribs or braces be stagincrease the strength of .the rbox without regered, as clearly indicated in the drawings,

so as not to destroy the'flexible characteristlcsof the reinforcements, but still serving to hold the ribs 8 against distortion, whereby the ori inal strength of the box is main- T veprovision of these short braces or ribs 9 constitutes a very important feature of the present invention as they greatly ducin'g its susceptibility to expansion and contraction without cracking during successive periods ofheating `and cooling.

For further strengthening the box I have found itdesirable to tie the sides of successive reinforcements 3 together by means of outwardly `projecting longitudinally extending ribs 10 and ribs .through-out the main unbroken bodies continuously'acrossthe reinforcements 3, as otherwisethey wouldl interfere with the fiexibility for which the reinforcen-lents are relied upon. At the corners ofthe boxes the ribs l0 preferably die down, as clearly indicated in AFigure 2, as the corners themselves function somewhat in the manner ofthe swells or reinforcements 3. The advantages of the present invention arise from the provision of a cast annealing box having reinforcements formed by dis-- placing a portion ofthe.l body -out of the main plane'thereof to form swells, and further reinforcing these swells by centrally extending ribs which are in tur'n tied to the sides of the swells bystaggered braces.

.Further advantages arise from the provision of a box of this character having longitudinally extending reinforcing ribs tending to tie the sides of adjacent swells without interfering with the expansion l and contraction of the'box.v '4 v I claim:

l. In an annealing box, a supporting wall having portions thereof swelled to form reinforcements, ribs` extending lengthwise throughout a portion at least of some of said swells', and means fortying said ribs to ati l' least one side wall of the; swell, substantially as described.

2.' In an annealing box, a supporting wall having portions thereof swelled to form reinforcements,. 'ribs extending lengthwise `throughout a portion at least of some of said swells, and means for tying opposite sides of said ribs to the walls' onboth sides of -the swell, substantially as described.`

3. In an annealing box, a supporting wall having portions thereof swelled to form freinforcements, ribs extending lengthwise throughout a portion'at lleast of some of said swells, andstaggered means fortying opposite sides of said ribs to the walls on both sides of the swell, substantially as described.

4. In an annealing box, a supporting wall having portions thereof swelled lto form reinforcements, 'a rib extending lengthwise vthroughout a Vportion at least of each swell,

and means fortyingv said rib to the walls of the swell, substantially as described.

5. In anannealing box,'a supporting wall having portions thereof swelled to form reinforcements, a rib extending lengthwise throughout'a'portion at least of each swell,

and staggered'y means for tying said rib to the walls ofthe swell, substantially as de# scribed.

6. In an' annealing box, a supporting wall having portions thereof swelled outwardly to form reinforcements, inwardly project- 1,560,708 v y B ing ribs in said reinforcements, and means gered on opbosite sides of the ribs to tie the for tying said ribs to the walls of vthe swells, same to the walls of the swells, substantially v lsubstantially as described. as described. g

7 In an'annealing box, a supporting wall In testimony whereof I have hereunto set 5 having portions thereof swelled outwardly my hand. l

to form reinforcements, inwardly projecting ribs in said reinforcements, and means stag- F. E. MESTA.

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