US497192A

US497192A - Frederik mohr

Info

Publication number: US497192A
Authority: US
Publication date: 1893-05-09
Anticipated expiration: 1910-05-09

Description

(No Model.)

F. MOHR, MANUFACTURE OF CARTRIDGE GASES.

Patented May 9, 1893.

UNITED STATES PATENT OFFICE.

FREDERIK MOHR, OF MAGDEBURG-BUGKAU, GERMANY, ASSIGNOR TO THE GRUSONVVERK, OF SAME PLACE.

MANUFACTURE OF CARTRIDGE-CASES.

SPECIFICATION forming part of Letters Patent No. 497,192, dated May 9, 1893.

Application filed October 5, 1892. Serial No. 447,895. (No model.)

To all whom it may concern: ample strength in the corner of the case after Be it known that I, FREDERIK MOHR,asubthe end is flattened. There it is necessary ject of the Kingof Denmark, and aresidentof that the case shall have a contraction e as lVIagdeburg-Buckau, in the Kingdom of Prusshown in Fig. 3 such contraction may be sub- 5 sia, German Empire, have invented certain sequently produced by suitably rolling the new and useful Improvements in the Manucase under a die. facture of Cartridge-Cases, of which the fol- If the case, after it has been finished, is to lowing is a specification. have a full, annular swelling in its interior as My invention relates to the manufacture of shown in Fig. 6 instead of the groove 6, Fig.

IO cartridge cases, and has for its object to sim- 3 the reinforcement f in the bottom corner of plify such manufacture chiefly with reference the cylinder must, in the original form Fig. 4, to the method of forming the rim. extend some distance up to the cylinder to In the manufacture of cartridge-cases as allow of the formation of aninternal annular heretofore practiced special difficulties were groove 9 Fig. 5 in the said thickened portion.

I 5 met with in pressing out the rim; these diffi- The annular rib h thus produced, remains culties are entirely overcome by the present standing when the end of the cylinder is invention. pressed flat as shown in Fig. 6.

According to this invention, the cartridge- As compared with the methods heretofore case is worked as heretofore described, while used, in which the metal in the cylinder ends 20 the bottom or end of the case is vaulted or is forced by enormous pressure to flow into curved and the case is then pressed to its finthe required shape for the rim, theherein deished shape. scribed method has the advantage that the In the accompanying drawingsz-Figure 1 rimoan be produced in a simple manner at a represents in central section a form to which low pressure.

25 the lower end of the case is first brought in Having now particularly described my inany suitable or well-known manner, as for vention, what I claim isexample by pressing, drawing or casting. 1. The herein described method of forming Fig. 2 shows an intermediate stage of the prothe rim of a cartridge-case which consists in cess of manufacture, and Fig. 3shows the end first producing a cylinder with a vaulted or 30 of the finished case. Figs. 4,5 and 6 are simicurved end thickened in the corner, then prolar views illustrating a slight modification. viding said cylinder with an external annu- Referring to Fig. 1 it will be seen that the lar groove, and finally pressing the bottom bottom a is made with a considerable curvafiat, substantially as, and for the purpose ture, and the angle or corner I) between the specified.

35 cylindrical part and the end is thickened for 2. The herein described method of forming apurpose hereinafter explained. In the outer cartridge-cases, with external rims and interside of the case at c is now formed either nal swells, which consists in forming cylinby turning, or by rolling by means of an inders with the vaulted or curved ends and clined disk of a suitable shape, an undercut thickened edges and sides adjacent to the 0 annular groove somewhat of the section edges, then forming the external and internal shown, so that the case is brought to the shape annular grooves d and g, and then compressrepresented in Fig. 2. cl is a thin rim of metal ing the vaulted ends, substantially in the man- 1 left at the end of the case after the groove 0 ner and for the purpose set forth. is formed. Next, the bottom or end a is 45 pressed fiat by means of suitable stamps and FREDERIK MOHR.

dies, whereby the rim cl is caused to assume Witnesses: the form shown in Fig. 3. The thick or full HERMANN LUBOWSKI, portion Z) previously referred to is to provide EMIL KALLNEOKER.