US402650A - Process of manufacturing pronged rivets - Google Patents

Description

(No Model!) M. BRAY.

PROCESS OF MANUFAOTURING PBONGED RIVETS.

No. 402,650. Patented May 7, 1889.

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UNITED :STATEs PATENT OFFICE.-

MELLEN BRAY, OF NEWTON, MASSACHUSETTS.

PROCESS OF-MANUFACTURING PRONGED RIVETS.

SPECIFICATION forming part of Letters Patent No. 402,650, dated May 7, 1889.

Application filed January 3, 1889- Serial No. 295,374. (No model.) I

To all whom. it may concern.-

'Be it known that I, MELLEN BRAY, of N ewton, in the county of Middlesex and State ofspecification.

My invention relates to the manufacture of rivets having a plurality of securing-prongs from solid wire; and it consists in an improved method or process of forming such rivets, which will be readily understood by reference to the description of the accompanying drawings, illustrating said process, and to the claim to be hereinafter given.

I11 the drawings illustrating my invention, Figures 1 and 2 are respectively a plan and a sectional elevation of a solid cylindrical rivet having a countersunk end with its outer corner beveled, and illustrating thefirst step in the production of a pronged rivet from a short cylinder of wire. Figs. 3 and 4 are respectively a plan and an elevation of the same rivet or blank as it-appears after the sides of the shank have been flattened by the second operation. Fig. 5-is an elevation of the same viewed in a direction at right angles to Fig. 4. Figs. 6 and? are respectively a plan and an elevation of the improved rivet produced by my improved process.

The rivet shown in Figs. 6 and 7 forms the subject-matter of another application of mine of even date herewith, in which the process of producing it is described but not claimed.

In the manufacture of pronged rivets from solid wire, as heretofore practiced, a solid rivet having a cylindrical shank has been first produced, and then the shank has been divided into two prongs by cutting away the central portion of the stock by means of revolving cutters or milling-tools, so called. This is necessarily a slow and expensive operation, and has therefore proved impractical. Attempts have been made to cut out the central portion of the stock of the cylindrical solid shank by means of apunch and die, but without practical success, for the reason that the breaking.

end of the punch or male die had to be made to fit the rounded side of the cylindrical shank, and the dies in consequence were, constantly To obviate this difficulty and render it practical to use male and female dies to remove the central portion of the stock from the shank of the solid shank of the rivet-blank is the object of my present invention; and to this end I first form the solid rivet, as shown in Figs. 1 and 2, from a short section of solid wire as the first step in my improved process. I then subject the shank b of said solid rivet to the action of pressure-dies to flatten two opposing sides thereof, as shown at c o in Figs.

3 and 4, said flattened surfaces 0 0 being formed of a width at least equal to the desired width 7 between the two prongs d d of the finished rivet shown in Figs. 6 and 7. I then place the flattened shank between suitably-shaped male and female dies the ends or bearing-surfaces of which are planes, and punch out the central portion of the stock, leaving the shank of the rivet in the form of two prongs, substantially as shown in Figs. 6 and 7.

The flattened sides may be slightly inclined to each other, as shown in Fig. 5, or they may be parallel, if preferred, without affecting the principles of my invention.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

The process of forming pronged rivets from sections of solid wire, which consists in first forming a head upon a short section of said wire, then subjecting the shank of the solid rivet thus formed to pressure to flatten two opposing sides thereof, and then punching out the central portion of the stock of said fiat toned shank by subjecting it to the action of male and female dies.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 24th day of Decem ber, A. D. 1888.

MELLEN BRAY.

\Vitnesses:

WALTER E. LOMBARD, N. C. LOMBARD.

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