US695265A - Tubular-rivet cap. - Google Patents

Description

Patented Mar. H, I902.

W P BARTEL TUBULAR BiVET CAP.

(Application filed Dec. 6, 1901 (No Model.)

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\VILLIAM P. BARTEL, OF \VALTIIAM, MASSACHUSETTS, ASSIGNOR TO J UDSON L. THOMSON MANUFACTURING COMPANY, OF IVALTHAM, MASSACHUSETTS, A CORPORATION OF MAINE.

TUBULAR-'RIVET CAP.

SPECIFICATION forming part of Letters Patent No. 695,265, dated March 11, 1902. Application filed December 6, 1901. Serial No. 84,916. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM P. BARTEL, a citizen of the United States, residing at Waltham, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Tubular-Rivet Caps, of which the following is a specification.

The object of this invention is to provide a cap for a tubular rivet, said cap being so constructed as to assist in the splitting of the tubular portion of said rivet at the end thereof and also in the clenching of said rivet in said cap when the rivet is driven thereon.

The invention consists in a cap for a tubular rivet having a pyramidal spreader.

Referring to the drawings, Figure 1 is a perspective view of my improved tubular-rivet cap. Fig. 2 is a plan view of the same. Fig. 3 is a section taken on line 3 3 of Fig. 2. Fig. 4 is a section taken on line 4 4 of Fig. 2. Fig.

5 is a diagrammatic horizontal section taken on line 5 5 of Fig. 3, showing in connection therewith the shank of a tubular rivet as it appears when first coming in contact with the cutting edges of the pyramidal spreader. Fig. 6 is a view similar to Fig. 5, showing the sections of the shank of the tubular rivet as it appears after having been driven upon the pyramidal spreader. Fig. 7 is a sectional elevation showing a tubular rivet clenched to a cap, having a spreader constructed in accordance with my invention and said cap and rivet being shown driven into two pieces of material. Fig. Sis a plan view of a cap having a hexagonal spreader therein.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 10 is a tubular-rivet cap constructed in accordance with my invention. Said cap is formed from a circular disk of sheet metal by means of dies, the rim 11 there of being turned over to form an annular recess 12, and the central portion being struck up to form a pyramidal spreader 13. The spreader 13, as shown in Figs. 1 and 2, has four faces 14 14, the intersection of each of two adjacent faces forming cutting edges 15 15.

The tubular rivet 16, Fig. 7, is driven through the stock in the usual manner, the

end of the tubular shank of the rivet first coming' into contact with the cutting edges of the pyramidal spreader 13, as shown in Fig. 5. Upon pressing the rivet downwardly upon the spreader the cylindrical shape of the shank portion in contact with said spreader assumes, approximately, the form of a square, and then is divided by the cutting edges 15 15 into four parts, 17 17, Fig. 6. Upon a further pressure upon the rivet these parts divide and curl outwardly and upwardlyinto the annular recess 12, as shown in Fig. 7. It will be seen that during this latter portion of the clenching operation of the rivet to the cap the faces 14 14 perform an important function, as well as the cutting edges 15 15, said faces 14 14 forming a continuous surface against which each of the parts 17 bears as the rivet is being forced upon the cap, or vice versa, bending the divided parts 17 17 and guiding them outwardly to enter said recess 12.

It will be seen that in addition to splitting the shank of the rivet and spreading the divided-portions thereof to enter the annular recess 12, as hereinbefore set forth, the shape of the spreaderin horizontal cross-section, as

shown in Figs. 5 and 6, prevents the cap from turning upon the rivet.

While I prefer to use a rivet having a pyramidal spreader with four faces, it is evident that the number of said faces may be varied without departing from the spirit of my invention.

It is evident that the faces 14 14 may be formed slightly convex or concave without departing from the spirit of my invention.

Having thus described my invention, what I claim, and desire by Letters Patent to secure, is.

A cap for a tubular rivet having a pyramidal spreader, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

WILLIAM P. BARTEL.

I/Vitnesses:

CHARLES S. Goonme, ANNIE J. DAILEY.

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