US686932A - Tubular rivet. - Google Patents

Description

Patented Nov. l9, 190i.

W. C. 81. M. N. BRAY.

TUBULAR RIVET.

(Application filed. Sept. 14. 1901.)

(No Model.)

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. UNrrnn STATES PATENT FFIQE;

\VILLIAM C. BRAY, OF NEWTON, AND MELLEN N. BRAY, OF BOSTON, MASSA- CHUSETTS, ASSIGNORS TO TUBULAR RIVET AND STUD COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

TUBULAR RIVET.

SPECIFICATION forming part of Letters Patent No. 686,932, dated November 19, 1901.

Application filed September 14, 1901. Serial No. 75,369- (No model.)

T at whom it may concern:

Be it known that we, WILLIAM C. BRAY, residing at Newton, in the county of Middlesex, and MELLEN N. BRAY, residing at Boston, in

the county of Suffolk, State of Massachusetts,

have invented certain new and useful Improvements in Tubular Rivets, of which the following is a specification.

The invention relates to that class of tubu- 1o lar rivets in which a cap is secured to the end of the rivet-shank by expanding or spreading the end of the shank into an annular recess formed in the cap.

The object of the invention is to secure an 1 5 efiective and even spreading of the end of the rivet-shank within the cap and also to enable the use of a stronger rivet-shank than heretofore. These objects are secured by providing the rivet-cap with a spreader having ribs thereon for splitting the end of the rivetshank, and thus defining the lines on which the shank will divide in expanding Within the recess in the cap.

A further object of the invention is to pro- 2 5 vide a cap which may correspond in shape to the head of the rivet, so that both ends of the rivet when in place in the material may have the same appearance. This is done by decreasing the thickness of the cap about its center to form the spreader. With the spreader thus formed the outer surface of the cap may be fiat, convex, or of other form to correspond to the shape of the rivet-head.

The features of the invention will be made more clear by reference to the accompanying drawings, in which--- Figure 1 is an elevation of the body of a rivet. Fig. 2 is a sectional view of a cap embodying the features of the invention. Fig. 3 is a plan view of Fig. 2. Fig. 4 is a longitudinal sectional view of the rivet with the cap secured to the shank. Fig. 5 is a plan view of the blank from which the cap is formed; and Fig. 6 is a sectional view on line 6 6, Fig. 5.

The body of the rivet shown in the drawings comprises a tubular shank a and a head I), which has a fiat outer surface, the rivet being a flat-headed rivet. In using the rivet the shank is passed through the materials and a cap 0 is secured to the end of the shank.

This cap is provided with a central spreader d, which enters the end of the rivet-shank as the cap and body of the rivet are forced together and causes the end of the rivet-shank to expand or spread outward into the annular 5 5 recess e, surrounding the spreader and formed by the inwardly-extending lip or flangef of the cap. The spreader is provided with ribs g, which act to split the end of the shank a and determine the lines on which it shall divide as it is expanded by the spreader d. Thus the proper and even spreading of the end of the shank is assured. The dividingribs also facilitate the splitting of the end of the rivetshank, thus enabling the walls of the rivet-shank to be strengthened, either by increasing their thickness or by using a tougher metal.

In forming the cap it is preferred to strike up the blank, as shown in Figs. 5 and 6, the spreader being formed by reducing the thickness of the surrounding metal and the surface of the blank opposite the spreader corresponding to the form of the rivet-head, being flat in the construction shown. The blank is then formed into the cap 0 in the usual manner. With this construction both ends of the rivet may have the same appearance when the parts are assembled, a strong and effective spreader is provided for expanding the rivet-shank, and the parts may be assembled by the use of fiat and inexpensive dies or anvils.

The number of ribs on the spreader may be varied; but thenumbershown hasbeenfound to give satisfactory results and is preferably used.

The ribs 9 lie between the divisions in the rivetshank and will assist in securing the cap and rivet-body in fixed relation by preventing any turning of the cap on the shank.

What we claim, and desire to secure by Letters Patent, is-

l. A cap for a tubular rivet having a spreader for expanding the end of the rivetshank, and ribs on the spreader for determining the lines on which the rivet-shank will divide, substantially as described.

2. A cap for a tubular rivet having a spreader of greater thickness than the sur- I00 rounding Wall of the cap, ribs on the spreader I In testimony whereof we have affixed our for determining the lines on which the rivetsignatures in presence of two witnesses. shank will divide, substantially as described.

. WILLIAM C BRAY.

3. A tubular rivet comprising a body por- T 5 tion having a tubular shank, a cap provided MELLEN 4 Witnesses:

F. A. EDMANDS,

M. E. GROOKER.

with a spreader, and ribs on the spreader dividing the end of the shank, substantially as described.

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