US1498308A - Method for the manufacturing of circular bottom plates for sheetmetal receptacles - Google Patents

Description

Mme 1? 1924. i,498,30 M. SINGEWALD METHOD FOR THE MANUFACTURING OF CIRCULAR BDM'OM PLATES FOR SHEET METAL REOEPTACLES Filed March 21. 1923 Patented June 17, 1924.

MAX SINGEWALD, 0F ZU'CKELHAUSEN, GERMANY.

METHOD FOR THE MANUFACTURING OF CIRCULAR BOTTOM PLATES FOR SHEET- METAL RECEPTACLES.

Application filed March 21, 1923. Serial No. 626,579.

T 0 all whom it may concern:

Be it known that I, MAX SINGEWALD, a citizen of the German Reich, residing at Zuckelhausen, Germany, have invented certain new and useful Improvements in Methods for the Manufacturing of Circular Bottom Plates for Sheet-Metal Receptacles (for which I have filed an application for patent in Germany on the 18th of March, 1922), of which the following is a specification.

For making sheet metal receptacles with circular bottom plates, for instance barrels, the circular bottom plates are commonly stamped out of quadrangular sheet metal plates. The waste resulting from this manufacturing method amounts to approximately 25% of the weight of the material. For this reason four cornered receptacles were frequently used for economys sake, although for the special purpose a receptacle of circular cross section would be better. In certain cases, for instance with heavy barrels which have to be rolled, it is impossible to do without the circular cross section of the sheet metal receptacle.

The method which will be hereinafter described serves to produce a cheaper sheet metal barrel, adapted to be rolled, and stronger than the barrels mentioned above.

The method consists. in starting from sheet metal strips which can be worked almost without waste and which may be them selves waste from sheet metal plates which have been used for other purposes.

In the accompanying drawing:

Figs. 1 and 2 show each in plan view and cross section a sheet metal strip to be used in this manufacturing method.

Fig. 3 shows a bottom plate for a barrel of circular cross section composed of triangular pieces, and I Fig. 4 shows a bottom plate composed of trapezoidal pieces.

The sheet metal strips a shown in Figs. 1 and 2 are reinforced by longitudinal grooves 8. Such a sheet metal strip a is cut into triangular pieces at (Fig. l) or into trapezoidal pieces t (Fig. 2). From one kind of pieces (Z or t as sectors the circular plate is composed. The joints of the several sectors are united for instance by Welding. In this manner a solid bottom (Fig. for a sheet metal receptacle of circular cross section is produced if the triangular sectors d from the strip shown in Fig. 1 are joined together. If the trapezoidal pieces 25 of the strip shown in Fig. 2 are joined together a bottom plate for a barrel is .produced which, as shown in Fig. t,'has a central opening.

The polygonal plates shown in Figs. 3 and 1 can be used already as bottom plates for barrels in most cases as their circumference will depart only very little from the circular shape if ii-sufficiently great number of pieces is used. If however an absolutely circular form is necessary there will be only very little waste, indicated in Figs. 3 and 4: by m.

The radial seams and tangential grooves of the polygon reinforce the bottom plate so that thinner sheet metal than hitherto can be used, the resistance being nevertheless increased. The reinforcing by the radial seams and tangential grooves is much more effective than the reinforcing by concentric grooves Which is sometimes used for circular bottom plates.

I claim A method for the manufacturing of circular bottom plates for sheet metal receptacles consisting in cutting into radial triangular pieces strips of sheet metal rein forced by longitudinal grooves, in putting these radial triangular pieces together to form a circular plate and in uniting the same at the joints.

. In testimony whereof I afiix my signature in presence of two witnesses.

MAX SIN GEWVALD.

Witnesses:

GoRDoN A. HIGGINS, RUDOLPH FRIoKE.

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