US1070817A - Sheet-metal construction. - Google Patents

Description

M. LAGHMAN.

SHEET METAL CONSTRUCTION.

APPLIOATION FILED MAY 6, 1913.

WITNESS 8 T A7: 7 1 BY INVENTOR 7/ max/nae lacgmhn COLUMBIA PMNOGRAPH C0,,WAsHlNu'roN, n. c.

UNITE i um MAURICE LAOHMAN, OF NEW YORK, N. Y.

SHEET-METAL CONSTRUCTION.

Specification of Letters Patent.

Patented A11 19,1913.

Application filed May 6, 1913. Serial No. 765,777.

T 0 all whom it may concern Be it known that I, MAURICE LACHMAN, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented cer tain new and useful Improvements in Sheet Metal Construction, of which the following is a specification.

My present invention relates to metallic constructions and particularly to such struc tures wherein a metallic frame surrounds and is secured to a metallic panel.

The invention is particularly adapted for use in sheet metal door construction and without in any manner limiting the invention it will be described as applied to this use.

The object of the invention is to provide an integral construction by welding the frame sections and the panel to each other and at the same time to avoid the objections heretofore present when such sections are welded to each other. In accordance with this object all mechanical joints are avoided and a smooth surface for an enamel finish is provided.

Heretofore it has commonly been the practice in metallic door constructions to either rivet the frame sections to the panel or to join such parts together by a folding operation both of which are expensive and have constituted the real reason why metallic doors have in most cases been prohibitive. It has also been attempted to weld the parts to each other but owing to the marring or roughening of the surface of the metal which necessarily takes place as a condition subsequent to the welding operation this method has heretofore been abandoned in favor of the more expensive riveting or folding of the parts as such marring or rough surface is readily discernible through the enamel which is subsequently applied as a finish. By practising this invention such marring or rough surface occasioned by the welding operation is entirely concealed so that a smooth even surface is presented on which to apply the enamel or other finish.

To these ends the invention consists in the improved construction hereinafter more particularly described and then specified in the claims.

In the accompanying drawings, Figure 1 is a front elevation of a sheet metal door constructed in accordance with this invention. Fig. 2 is a transverse section through the same taken on the line 2 2. Fig. 3 is an enlarged similar section through one side of the door in finished form. Fig. 4: is a similar section through a door in which but a single panel is employed. Fig. 5 is a view similar to Fig. 3 and showing the con struction previous to folding over the weld concealing part.

1, 2 indicate the side stiles and 3, l indicate the top and bottom respectively or end stiles of a door of any'desired form. The said stile or frame sections are formed of sheet metal in any suitable manner and secured to each other along the abutting edges 5 by brazing, soldering or in any other manner as will be readily understood by persons skilled in the art.

6 indicates the panel and while in the present case but one panel is shown throughout the length and width of the door it will be understood that any number of panels that may be desired may be employed. The panel 6 may be of double thickness as shown in Figs. 2 and 3, in which case the two sheets of metal are spaced apart by blocks 7 or it may be of single thickness as shown in Fig. 4. Also if desired the space between the panels and within the stiles may be filled with sound-deadening material, all as well known in the art and forming no part of this invention. Also if desired the panel 6 may extend through the stile members and be provided with a lateral flange 8 adapted to bear against the ends of the stiles on the inner side thereof and such bearing surface may be secured to each other to provide rigidity to the door.

The stile or frame members 1, 2, 3 and 4 are each provided with an inwardly projecting flange 9 which bears on the outer surface of the panel 6. The flange 9 is preferably joined to the stile by a molding 10 of any desired formation. The flange 9 is welded along the meeting surface between it and the panel 6 preferably at a number of isolated spots and preferably by employing the electric welding process now well known. This welding is accomplished, as will be readily understood by those skilled in the art, by bringing electrodes into contact with the parts opposite each other and passing an electric current from one to the other and applying pressure by means of the electrodes as the work softens between them to force the metal together. The electrodes in common practice for this work are more or less pointed and therefore, as is also well known, mar or roughen the surface of the metal, as for instance the flange 9, to a more or less extent thus preventing a smooth finish being applied to the construction.

11 indicates an extension of the flange 9 preferably integral. therewith and which during the welding operation preferably is disposed laterally to the flange, as shown in Fig.5, so as to be in position to be readily folded over said flange after the welding is completed. After the flange 9 has been welded to the panel 6 the extension 11 is folded back upon the flange 9 and preferably pressed into fiat contact therewith as indicated. in F i 2 3 and a, whereby any rough sinfface made by thewelding electrodes hidden beneath itand a smooth upper surface is presented for the enamel or other finish that it desired to apply to the surface of the door.

As is usual the moldings 10 and flanges 9 are initercd at the corners and soldered or brazed together, although other ways of finishing the corners may be employed without departing from the spirit of this invention hat I claim as my invention is z 1. The combination with sheet metal frame sections, of a panel, inwardly projecting flanges on said frame sections welded to said panel and extensions of said flanges bent over said flanges and concealing said welded portions.

2. The combination with sheet metal frame sections, of a panel, flanges secured to said frame sections and bearing on said panel and united thereto by a plurality of welds and integral extensions of said flanges bent back thereon and concealing said welds.

8. The combination with sheet metal frame sections, of a panel, inwardly projecting flanges emanating from said frame sections and integrally united with the surface of said panel by a plurality of spot welds and integral extensions of said flanges bentback into flat contact therewith and concealing said welds.

t. In a metallic door construction, side and end stiles of sheet metal, a sheet metal panel and moldings joining said stile sections to said panel, said moldings being provided with a flange welded to said panel and extensions bent back on said flanges and adapted to conceal said welded portions.

Signed at New York in the county of New York and State of New York this 5th day of May A. D. 1913.

MAURICE LACHMAN.

Witnesses F. B. TOWNSEND, K. M. MOMAI-ION.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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