US511392A

US511392A - Process of embossing sheet-metal

Info

Publication number: US511392A
Authority: US
Publication date: 1893-12-26
Anticipated expiration: 1910-12-26

Description

' J. WH- IIII OOOOOOOO IN lll l l l lI1 mmm; 1

I I l I I I I I I I 'I nnnnnnnnnnnnnnnnnn a coMPANV.

nnnnnnnnnnnn o.

xov

UNITED STATES PATENT OFFICE.

JAMES llTI'lIlE, OF BROOKLYN, NEV YORK.

PROCESS OF EMBOSSING SHEET-METAL.

SPECIFICATION forming part of Letters Patent N o. 511,392, dated December 26, 1893. Application filed March 23, 1892. Renewed May 29, 1893. Serial No. 475,978. (No specimens.)

To all whom it may concern:

Be it known that I, JAMES WHITE,a citizen of the United States,residing at Brooklyn, Kings county, New York, have invented certain new and useful Improvements in Processes of Embossing Sheet Metal, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The object of this invention is to facilitate the production of embossed figures in high relief upon sheet metal by stamping, pressing or drawing the same in suitable dies, and the invention consists in a new process, to effect this object.

The method or process consists in rst crimping the sheet metal to produce a nely corrugated structure, and secondly, pressing the metal between thel required tools to produce the raised or embossed design thereon. The crimping or corrugatingof the sheet metal disposes the substance of the metal in alternate ridges and hollows, and such disposition prepares the metal in a peculiar manner to yield and stretch most favorably when it is subjected to the embossing tools. The crimping produces this eect, because it permits the metal, when it is pressed transverse to the corrugations, to atten Vout between the ribs, and to thus furnish the required material without any extension of the bers. When pressed in a direction parallel with the corrugations the bers of the metal are stretched much less than in a fiat sheet, because there is more material in a corrugated sheet than in a iiat sheet of the same size, and the eXtension produced in embossing such sheet is secured with less separation of the bers.

By this invention ornaments in much higher relief may be produced without injury to the metal than can be produced from a plain flat sheet of the same thickness.

The invention will be understood by reference to the annexed drawings, in which- Figure 1 is a cross section of a at sheet with a hemisphere embossed thereon, with the embossing dies upon opposite sides of the sheet. Fig. 2 is a plan of the same sheet.

Fig. 3 is a plan, and Fig. 4 a longitudinal section of a strip with three similar ornaments embossed thereon.

Figs. l and 2 are drawn to illustrate the flattening out of the metal between the corrugated ridges in the act of embossing.

A is a flat sheet with hemisphere B- embossed thereon.

G, G', are the embossing dies.

Thesheet is corrugated with alternate ridges c and hollows d, and the section in Fig.` 1 shows the effect of the dies where the hemisphere is' pressed, in iiattening and stretching the ribs apart and diminishing the depth of the hollows, the metal thus yielding freely to the operation of the tools without any extension whatever of its bers transverse to the corrugations. The attened ribs are also shown by the curved lines c in Fig. 2. In the other direction it is obvious that the metal would be stretched in some degree, but that the extension of the bers would be very much less than in a flat sheet subjected to the same tools; because there would be much more substance in the metal to be extended, and because the tension lengthwise of the corrugations would also operate to atten the ridges and raise the bottoms of the hollows, the same as the tension in a transverse direction.

The eect in embossing the sheet metal is precisely the same whatever be the nature of the ornament, the substance of the metal upon a given area of the sheet being much greater than in a flat sheet of the same area, and the disposition of the corrugations furnishing a greater amount of material for the extension demanded in the embossing operation.

Sheet metal of N o. 26* gage may be crimped with ve or six ridges to the inch, and then readily embossed in high relief. My improvement is therefore especially valuable in the production of architectural ornaments from zinc, copper, and galvanizedl iron; which ornaments are commonly painted in imitation of stone, and present a much closer resemblance to such material when the surface isroughened by the crimping operation.

Heretofore, it has been common, when architectural ornaments in high relief were required, to stamp the same of annealed zinc;

which requires the expense of an annealing oven, and then secure them upon flat sheets 5 of galvanized iron.

It is immaterial to my present invention what kind of tools be employed to produce the embossed design upon the crimped sheet metal.

Figs. 3 and 4 show the invention applied to an oblong plate of metal adapted to ornament a panel, frieze, or cornice, the sheet A being crimped transversely and three similar ornaments E in high relief embossed upon the I5 samez which could not be done with galvanmy hand in the presence of two subscribing witnesses.

J AMES WHITE. lVitnesses:

ANsoN 0. KITTREDGE, T. S. CRANE.