US256117A - Manufacture of tubular rivets - Google Patents

Description

BRAY.

(No Model.)

MANUFACTURE OP'TUBULAR RIVETS.

Patented Apr. 11, 1882.

% Inventor: y

Attorney.

N. PETERS Photo-Lithograph". Wzihingion. D C.

UNIT STATES PATENT OFFICE.-

MELLEN N. BRAY, or nos'ron, MASSACHUSETTS.

MANUFACTURE TUBULAR RIVETS SPECIFICATION forming part of Letters Patent No.'256,11'7, dated April 11, 1882.

Application filed February 13, 1882. (No model.)

To all whom it may concern Be it known that I, MELLEN N. BRAY, of

Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and 'usei'ul Improvements in the Manufacture of Tubular Rivets, of which the following, taken ing or rolling a portion of said blank into the form of a tube or hollow cylinder, turning down the other portion of said blank into a position at right angles to the axis of the tube or hollow cylinder, and at the same time turning outward a portion of that end of said tube which originally formed the middle portion of the blank, so as to form an outwardly-projecting flange, swaging that portion of the blank that was not rolled into the tubular form, so as to make it slightly concavo-convex, turning said concave-convex portion of the blank over upon the flanged end of the tube, with the convex side outward, turning its outer edge downward around the flange of the tube and then inward beneath said flange, and then swaging the head of the rivet in suitable dies to firmly lock the parts together and correct any irregularity in the shape of the head.

Figures 1 and 2 of the drawings are respectively a plan and edge view of the blank as it is punched from the sheet of thin metal. Fig. 3 is an elevation showing the blank after a portion of it has been rolled into the form of a tube. Figs. 4 and 5 are respectively a plan and a side elevation of the same after the cap portion of the blank and aportion of the walls of the tube have been turned outward or at right angles to the main body of the tube. Figs. 6 and 7 are respectively a plan and a central vertical section of the same after the cap portion has been swaged into a concavoconvex form. Figs. 8 and 9 are respectively I an inverted plan and an elevation of the same after the cap portion hasbeen turned over upon the flanged end of the tube and turned down around said flange. Fig. 10 is a verti cal section on line a :10 on Figs. 8 and 9. Figs. 11, 12, and 13 are respectively an inverted plan, an elevation, and a central vertical section of the finished rivet; and Figs. 14 and 15 are respectively an inverted plan and a central vertical section of a piece of leather with my improved rivet set therein.

In the manufacture of my improved rivet I first cut or punch from sheet metal the blank A, having out therein the slits or incisions a,

b, and 0, arranged as shown in Fig.1. I then at right angles, or nearly so, to the main body of the tube. The section A is then subjected to the action of swaging-dies to render it concavo-convex, as shown in Figs. 6 and 7. The cap-section A is then turned over upon the flanged end of the tube, and its edges are turned down around the edge of the flange d, as shown in Figs. 8, 9, and 10, and then by the next and final operation the edge of said capsectiou is turned under the flange d, and the rivet is completed. This makes a very good rivet, capable of cutting its own way through the material and retaining the core out from the material within the hollow of the tube, as shown in Fig. 15, at a comparatively small cost. The slit 0 and the joint in the tube opposite thereto will cause the rivet to clinch in two parts, as shown in Fig. 14.

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

1. The blank A, cut in the form shown, and provided with the slits or incisions a, b, and c, from which to form a tubular capped headed rivet, substantially as described.

2. The process of forming tubular rivets from sheet metal by first cutting a blank to the form shown in Fig. 1, and forming therein the slits or incisions a, b, and c, bending or rolling one section or portion of said blank into the form of a tube, turning or bending the other sectionor portion of said blank and a portion of the end of the rolled-up or tubuder said flange, substantially as and for the 10 lar section outward at right angles, or nearly purposes described.

so, to the axis of the tube, swaging the sec- Executed at Boston, Massachusetts, this 9th gion sobturlned outgard into a concave-convex day of February, A. D. 1882.

orm, en ing sai eoneavo convex section over upon the flanged end of the tubular sec- MELLEN EBAY tion to form a cap thereto, and turning the out Witnesses er edge of said cap-section down around the E. A. HEMMENWAY, edge of the flange of the tube and then un- WALTER E. LOMBARD.

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