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Publication numberUS820976 A
Publication typeGrant
Publication dateMay 22, 1906
Filing dateSep 22, 1904
Priority dateSep 22, 1904
Publication numberUS 820976 A, US 820976A, US-A-820976, US820976 A, US820976A
InventorsEdward Katzinger
Original AssigneeEdward Katzinger
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of making pans.
US 820976 A
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Description  (OCR text may contain errors)






4 SHEETS-snm 4.

NETE STATES PATENT @Fliltlir Specification of Letters Patent.

Patenten. may 2 2, 1906.

i Application filed September 22, 1904. Serial No. 225,431.

To (LU, Ir/'7mm it may concern/ Be it known that l, EDWARD KATZINGER, a citizen of the United States, residing at Chicago, in `the county of Cook and State of Illinois, have invented certain new and useful Improvements in the Method of Making Pans, of which the following is a full, clear, and exact specification.

My invention relates to pans generally, but more especially to baking-pans, and has for its primary object to form successfully and commercially a concave-convex corner on a pan produced from tlnn sheet metal of a low grade incapable of standing any considerable degree of drawing. The object of having suoli a corner on a pan is too obvious to require explanation; but it might be briefly stated that with a pan of this form not only 4 the liability of damage from the peel in the tion consists trating the second step of the met attempts of the baker to insert it under the pan are reduced to the minimum and the life of the pan thereby prolonged, but the interior is kept free from crevices, indentations, and sharp corners, which hold articles of the loaf, and thus vnot only make t e pan difficult to clean, but disligures the loaf, and in addition to these advantagesis the other important advantage of being more readily nested and not so liable to cling or jam together when nested. To form this desire-d concavoconvex corner on a 'pan roduced from stout stock and the higher gra es of metal that will allow of the requisite' amount of drawing might be a comparatively simple task g but when heretofore known methods have been employed for producing the same result from the very thin or lower grades of stock, which should be employed to make an inexpensive article, the same will not draw without rupturing, and hence drawing cannotbe relied on, and the corner must be formed primarily by the folding method. y

With the described ends in view the invenin the features of novelty. described herein and shown in the accompanying drawings, and more particularly pointed out in the claims. i

In the said drawings, Figure 1 is a pattern or plan of the blank, illustrating the first step of the process or method. Fig. 2 is aside elevation of the blank after itis cu pcd, illuslied. Fig. 3 is a vertical longitudinal section of the cupped blank. Fig. 4 is a plan view thereof. Fig. 5 is an end elevation t ereof. Fig. 5a is a iagrain of one of the corners thereof. Fig.

6 is a side elevation of the cupped blank after the flaps. have been folded inwardly into position against 'theend walls, illustrating the third step of the method. Fig. y,7 is an end elevation thereof. Fig. S is an enlarged detail view of one corner thereof in elevati-on. Fig. 9 is an enlarged detail plan view of one corner, showing the inside. Fig. 10 is a lan view of the an with the rim-wire in p ace, illustrating t e fourth step of the method. Fig. 11 is a perspective view of the 'finished pan after the 'wings or flapswhich hold the rim-wire have been squeeaedl Vinto place, that being the fifth and last step of the method for making a complete pan. Fig. 11u is an enlarged pers ective of one corner. Fig. 12 1s an enlarge detail bottom view of one corner of the cupped blank shown in Fig. 4. Fig. 13 is a perspective View of such corner. Fig. 14 is a side elevation thereof. Fig. 15 is a horizontal section thereof on the line 15 15, F

.16. Fig. 16 is an upright section on the line 16 16, Fig. 13,' and Fig. 17 is 'adiagram ,showing the outlines that would occur on the various section-lines A B C D E F, Fig. 14, and also showing the bend or general direction of the corner-flap, as will be hereinafter' eX lained.

n-carrying out my invention I cup a blank to produce the form illustrated in Figs. 2 to 5, the original blank being shown in Fig. 1, and the blank thuscupped, it will be seen, has a two-ply flap of triangularv form projecting from each of its corners, the pan to be roduced being rectangular; but as all of t lese flaps are the same in form and construction and are produced by similar means and method the description may be confined to one of them, which will suffice for all. As better shown in Fig. 13, this flap is two ply or comprises two sides 1 2, rojecting from and formed on,.respectivel ,tlie side and en'd walls 3 4 of the pan, and w 'ch side and end Walls conjoin with the bottom 5 by Uradual rounding bends 6 7, respectively, which are of liberal radius, so as to absolutely avoid the pos- IOO sibility of the peel striking) and indenting the wall of the pan near the ottom or of particles of the loaf or other objectionable matter fouling the interior along the line of conjunction between the wall and the bottom. This two-ply flap, it will be seen, has one of the angles of its tri angular form situated at the bottom corner of the pan, another at the top corner, and the third at the outer end of the triangle, so that when folded yor vsmoothed n rial an against the end Wall 4 of the pan the sides 1 and 2 of the ap will come together and the outer corner of the triangle wlll lie against the end Wall 4 and adjacent to the top of the pan,-With the upper/'edge of the flap substantially parallel with the upper edge of the pan, as shown in Fig. 7. This yparticular form of the lap and relation of its outer corner to the upper edge of he pan, however, is not mate! is only referred to for the purpose of accountin for the peculiar formation of'the blank 8 (s own in F-ig. 1) from which the pan is reduced. i A

t will be seen that the general form of the blank 8 is rectangular,A with the corners cut away or notched to'produce at each corner an angular projection 9, the apex of which constitutes-the outer corner of the flap 1 2,

while the inner upper corner of theflap oc-. curs at the points 10 11. By thus notching the corners of the blank straight strips or lips 12 13-'are left o n the ends and sides ofthe blank, respectively, and these eventually -forln the li s, bearing the same reference- 'numerals w ich appear in Fig. 11, for holding Vthe rim-wire 1.4, as is usual in this art-3- There isv therefore no special importance in the particular shape of blankv 8', the features of novelty residing Wholly inl the shape of the flap 1 2 and the method in which it is folded to roduce the 'concave-convex corner andl W ich will now be described. f

o produce thecupped blank shown in,

Fig. 4, the blank.8, Fi g. 1, is depressed2 at the center portion', (marked by the dotted lines in Fi .'1,) leaving each corner standing outward y, as in Figs. 4 and 5, to produce the two-ply flap 1 2 of the peculiar shape and formation shown in the drawings and which4 is eventually folded inwardly against one wall of the pan, preferably the end Wall, as

` shown 1n Figs. 6 to 9, this constituting the' third step of the method J while the formation of the blank 8 and the cupping thereof to produce the form shown. in Fig. 4 constitute, re-A spectivelthe first and second steps. After this thir lstep the fourth and fifth steps, coni sisting, respectively, of placn the rim-wire' l' asin Fig. 10, and pnchngt e `lips -12 `13 around the rim-Wire, being common in this art, are -performed. j y

It is apparent from Figs. 3, 9,and'15 that the places where the Walls conjoin with the bottom rounded or curved in cross-section, but that'the upright edges also are similarly rounded, and the' extreme bottom corners, on that point at. eachv corner of the pan Where the bottom, the sides, and the end walls meet,

is. concavo-convex and on the exterior is referabl a aart of a erfect s here While n a y the interiorq is a counterpart thereof. In order to produce tlns concave-convex corner, it

f'growin the-round form of t e inner not only 'are-the bottonel edges'of the pan or l curvatureof 'the concave Aconvex corner. This creasing of the flap along the curved line y 15 causesit to bend sharply along this line y when the flap is folded inwardly against the end wall of the pan, whereas if the flap, or, more accurately speakin ,the side 2 of the flap, were not so creased t e metalwould not .only wrinkle at the corner, but would bend in al straight line, and consequently produce a sharp corner instead of the desired convex corner. sides of the flap were thus creased the'outer side when folded against'the walll ofA the pan` would contain an objectionable wrinkle. Therefore the inner given this sharp crease, and in the other iigures of the drawings this is shown in the form of an lelongated indentation 15, which extends from the lower end of the curved line 15, or a point situated at or about the center of 'the concave-convex corner duced,fupwardl a sufficient distance to insure'l a shar' fol in -ilap along the curved line ..15 at' the ower end of the fla the proper folding. ofthe upper end oft e flapbeing comparatively simple .and not requiring tlns sharp indentation 15". y It is`v also apparent from the various sections in Fig. 17, Vmade with reference'to Fig. .14', that the end wall of the pan whereit conjoins with' this indented part 15El must be rounded inwardly, as shown at 16, to conformto the curvatureof the u f right corner of the pan, forotherwise when-t e 'flapis folded against thefend wall it would produce a sharp angle with the. side wall.

his curvature 1'6 also, it will be seenlby ref erencetoFigs.I 14 and. 17- disappears at or about the upper end of the kink or crease 15, 'it being sharpest 'or most section Fy or below the section F and gradually curvature of the upper end of the `flap above sectiorgfor forming the upper part of the rounded corner bein readiy reduced by ie, which 1s placed withinthe pan inthe usual manner while the flap is being thusfolded, inasmuch as the u per part of the flap is folded'ona. the upperend of l It isa soapparent from Figl 17 that the ply o1" side 2 ofthe flap'is bent at a sharper angle to the-end-wall of the pan fthan the ly 1 tothe side wall, and the lower -edge of t e .along the I sidesof will be seen that the Walls Aof" the pan at the i 65 corner or upright edgernust be'pinched tof-- straight ine as indicated b the line i5, fig. 5e.

point at or about the-center of theconcavo-U l convex corner to be produced in an indirect 5 Tt is apparent, however, that vif both side only ofthe flap is ronounced on the j Iless distinct until the section A is reache ,f Where it disappears entirelyy the".

line inclining in the direction in which the flap is to be folded against t'he end wall of the `pan, this line being indicatedbvthe two straightlines 17 18, Fig. v17,`whieh meet at or about the point where the upright indentation disap iears.

the' flap is prov need. as is' also the indentation 15 and curvature 16, by operation which eup': the blank to t produc-e e f orm shown in Fig. 4, by any surta i le dies,

complementary in shape to this form and not -necessary to be described in tlns application,

or thesume muy beprmlueed by hand or by an) other means; but the described formaderstood in this tionenables 'me lo prod uee the pan by -m'aehnu-ryor dies very economically from a tlnn or low-grade stock, which could not be other- I .wise given this desirable concave-convex corner Without crackin(r or rupturing the metal, and hence I" am ena led to manufacture the article on a large or'commereial scale. and by wall first to that portion of the V- bend, and consequent ly vpressure (which sub the. outer end of the .resented by the line 18 and which finds its reason'oi' mv ability to employ a low-grade Stock. I produce u much cheaper article and one of a vastlvsuperior form or shape.

In the -folding operation which presses the flap 1 B'against the end .wall 4 )ressure is applied in the direction paralle with the 'end lowerend of 'the fiap, which is represented bythe line 17 and which line has i ts counterpart in the artiele in the" form ol' n thin ridge 17,extending along th'e lower edge 'of the fla p, thus starting the bending of the flap near its` lower end or corner before the upper or outer end begins to the lower end of the flap will be bent .around the rounding portion 16 of the end wall and made to conform to the concave-convex shape of thecorner and has its shape thus fixedlygestablished before the Sequently comes against flap or that portion repcounterpart-n the article in the ridge 1S?) has I' tionor crease 15* along an opportunity to cause the flap to buckle or become distorted at or near the lower end or corner portion, as would be the case should the ressure be ap lied to the outer end of the ilap first,since t ere'would be no means f just where the first sharpest bend woul occur, and if such'bend should occur at any place other than the indentathe curved line 15,

Fig. '5 1; 'theap at the ower end contiguous to the corner oflthe pan could not be folded This pee-u iar langle of smoothing die one and the same f and as it depresses SCquently folding smoothly7 against the-corner and in c qnforniity with the curved line 15g brit-:when this is once accomplished the 0 ,uppler outer end of the flap against the end wa of thepanfollows as a simple matter and may be readily accomplished by any suitable or former which engages the,

fiap on the side theridge 1 7jsubsequently 1 and along the ridge. 17 firstproper folding of thc.

comes into contact with the ridge 18. and

then presses the whole. flap downwardl or inwardly a ainst the wall 4, the shape o the interior of t le an being of course maintained by any suitab e art.

Having thus described my invention, what I claim as new therein, and desire tosecure by Letters Patent, is

1 The method of forming a concave-convex corner on a sheet-metal pan, which consists in cup ping a blank to produce a twofplylap projecting outwardly. .from the point where the corner is to Abe produced, n a trial4 'A guiar form, having two of its angles situated at the top and bottom corners of the an andi the other at the outer end ofthe flap, nding one ly of said flap at'a sharp the other where they conjoln respectively with the walls of the pan, then applying pressure first to the lower-'corner of said triangle and then to its outer and upper corner in a direction transverseto the flap and toward'the ly having the sharper of the twoaugles and ongitudinally of one wallof `the pan until the sides of the Hap are folded together against such wall of the pan. 42. The method of making a concavo-con',

form a two-ply sists in cupping a blank to oint flap projecting outwardly from-*the .where the corner is to be produced, providing one ply of said ila with a sharp indentation along aline curve to conform to thejsald concavo-convex corner and extend ng from about the center of such corner up ardlv along the line of the upright corner or line of conJunetion between the. side and end walls, and subsaid flap inwardly 'against one wall of the pan, over said indentation. Y


FRANCIS A. IlorKrNs, A. M. Unna.

er'angle tb "l Vex corner of a sheet-metal pan; which conf 'roo

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2669914 *Jun 12, 1950Feb 23, 1954Aluminum Foil Packaging CoMethod of making metal foil pans
US2912080 *Mar 24, 1958Nov 10, 1959Gerald S IkelheimerLuggage construction, means and method for making same
US3335595 *Dec 30, 1964Aug 15, 1967Borg WarnerCover plate for friction device
US3722252 *Aug 20, 1970Mar 27, 1973Gen Metalcraft IncSheet metal forming apparatus
US5749190 *Dec 19, 1994May 12, 1998Williams; Steven RayHVAC register box
US6643995 *May 19, 2000Nov 11, 2003Uni-Charm CorporationProcess and apparatus for manufacturing packages
Cooperative ClassificationB21D51/2615