USRE7167E - Improvement in the manufacture of carriage-bolts - Google Patents

Description

J. B. CLARK.

MANUFACTURE OF CARRIAGE-BOLTS.

Reissuefl. June 13, I876.

9 1 v :2). @Q a 31131125535. gunning MPEIERS, FHOTO-LIYNOGRAPMER, wAsmNGTcn n C UNITED STATES PATENT OFFICE.

JAMES B. CLARK, or rnAn'rsvrnta'Assronoa, BY MESNE-ASSIGNMENTfi TO IEGK, STOW, AND WILOOX COMPANY, OF SOUTHINGTON, DONlfT. IMPROVEMENT IN THE MANUFACTURE QF CARRIAGE-BOLTS.

Specification forming part of Letters Patent No. 96,308, dated November 2, 1869 reissue No. 7,167. dated J uue 13,1876 application filed May 10, 1876.

To all whom it may concern:

.Be it knownthat I, JAMES B. CLARK, of

Plantsville, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in the 'Manufactnre of Carriage-Bolts; and I do hereby declare, that the following isa full, clear, and exact description thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawing, making a part of this specification.

The invention-relates, mainly, "to the blank which is the result of the first step in the manufacture of bolts, which blank is subsequently formed into a square-neck round-headed bolt, the upper end of the square neck beingformed by upsetting the metal in'the act of forming the head, as hereinafter described.

' In the accompanying drawing, Figure 1 is a sideelevation-of a bolt-blank, the result of the first step in the manufacture of bolts in accordance with my invention. Fig.2 is alike view of a boltblank, the result of the first step in the manufacture of bolts in the ordinary manner; and Fig. 3 is a side elevation of a completed carriage-bolt ready for threadscrew end 0 of a bolt, is first cut into proper lengths, and an enlargement, B, larger than either end of the blank, Fig. 1, is made at the point, which is to be formed into the base of the square neck a, Fig.3. The enlargement Bis tapering, and is in the form of a frustum of a cone or pyramid. The base of 'the enlarged portion B should be of such size that it can be squared into asquare, the sides of which are equal to the diameter of the screw end 0, While the top of the enlargedportion should be of the same size as the original rod.

In Fig. 1, A and (J are of the same size, which is, of course, less than the size of the enlarged portion. A designates the end which is to be upset to form the head.

I prefer to form the enlarged portion by upsetting; but the blank with this enlargement thereon may be formed of a larger-sized iron by forging the same in suitable dies under a Round iron, of a size proper to form the power-hammeryor other machine. The blanks being th us formed are reheated, so as toheat the end A and enlarged portion 13, and then placed in an ordinary heading-die, with the end U downward, and the dies are then forced tov gethcr, the angular "portion thereof closing head by upsetting, which operation will also.

upset the metal at apoint below the head,

thereby completely filling the angular portion of the dies, and perfecting or finishing the square neck of the bolt.

Ordinarily roundstemmed, square-necked, and round-headed bolts of the class shown in Fig. 3 are formed by first throwing the metal intothe form shown in Fig. 2, in which the end to be headed, and the portion which is to be formed into the square neck,are of the same size, and together constitute a cylindrical body, I), of a size sufficient to be formed into a square, the sides of which are equal to thediaineter of the screw end (3. These blanks, Fig. 2, are squared by pressure between like dies, and in like manner herein described for squaring the base of the taper or enlargement B; but as the-whole length of the square neck in this ordinary style is squared all at one time,-it will be plainly seen that a great amount of pressure must be used to close the dies, while sometimes the same may not be closed as much as at other times, thus making the size of the square necks vary, and the corners rounded or blunt.

By my process of first throwing the metal into the peculiar blank, and then finishing as described, the square necks of the bolts produced will be of uniform size, and with angular corners, thus producing a better article Without increasing the cost, or changing the squaring or heading tools. The wear of the sqlu'u-ing-ilies is also much less than it is in the mzumfiwture of bolts by the ordinary process.

' l elz'tim as my invention- The improvement in the manufacture ofcarliege-bolts, which eonsists in first forming an theblmlk, by upsetting, an enlarged porti'on, B, larger than either end of said blank, and

then forming the game into a square-neck IOlllld-llGkLdOtl bolt, the upper end of the square neck being formed by upsetting the metal in the act of heading, substantially as described.

JAMES B. CLARK. Witnesses: v

LUCAS O. CLARK, SALMON G. CLARK.

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