US96308A

US96308A - Improvement in bolt-blanks

Info

Publication number: US96308A
Authority: US
Publication date: 1869-11-02
Anticipated expiration: 1886-11-02

Description

UNITED STATEs PATENT OEEIeE.l d/

JAMES B. CLARK, OF PLANTSVILLE, CONNECTICUT.

IMPROVEMENT IN '.BOLT-BLANKS.

Spect'jication ffwming part of Letters Patent No. 96,308, dated November 2, 1869.

To all whom it may concern:

Be it known that I, JAMES B. CLARK, of Plantsville, in the county ot' Hartford, State of Connecticut, have invented a new and Improved Blank for Carriage-Bolts; and I do hereby declare that the following is a full,

l a blank from which a bolt is to be forged, with both of its ends round, while the portion designed to be squared is formed into the shape ot' the frustum ot' a cone, with the base thereof larger than the diameter ot1 the aforesaid ends, and adjoining the end of the blank which is to remain round.

In Fig. 1, A designates the round end of the blank, from which the head is to be formed. B designates the conical or tapering portion whichis to be squared in heading, while C designates the end that will remain round and unchanged in forging the bolt.

The blanks are made of round iron of the proper size to form the screw part of the bolt, and may be upset so as to form the taper B in ally 'pI'Opel' lll'rtflllef.`

.I upset the same by first heating the lower portion ot' the part to be squared, and then clamp the round end C in a proper clamp. Blowsor pressure are then brought to bear on the end A, which will upset the blank, as shown at B, Fig. 1.

1f desired, the blank could'be formed of iron a little larger than designed to leave the round end C by forging the blanks in suitable dies under a power-hammer or a similar machine. The base of the taper B should be of such size that it can be squared into a square the sides of which are equal to the diameter of the end C, while the top of the taper B should be -of the same diameter as the lends'A and C. The blanks when thus constructed are again placed in a proper furnace, so as to heat the end A and taper B, and then inclosed in an ordinary heading-die with the end C downward, and the die is then closed, which will square the base of the taper B.

As only a small portion of the taper is of the proper size to make a square of the desired size, it will readily be perceived that only a small amount of pressure will be necessary to close the dies.` When the dies are so closed the heading-tool, as it forms the end A into a head, also further upsets the taper portion B of the blank, until it tills the die and finishes the square partof the bolt. l

Ordinarily blanks for bolts that are squared in heading are formed with the end D, (see Fig. 2,) with parallel sides, and of a size sut'- icient to be formed into a square equal to the diameter of the end E, which end E is to remain round when finished, the same as the end C in Fig. 1.

These blanks are squared by pressure between like dies, and in like manner herein described for squaring the base of the taper B; but as the whole of the square in the 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 squares vary and the corners rounded or blunt.

By my invention I produce a blank from which bolts can be formed the square portion of which will be of a uniform size and with angular corners, thus producing a better article without increasing the cost or changing the squaring and heading tools. The wear ot' the squaring-diesin forging bolts from blanks of my invention is much less than itis in forging bolt-s from ordinary blanks.

What I claim as new, and desireA to secure by Letters Patent, is-

A round bolt-blank, consisting of the round ends A and C and the round taper B, substantially as shown and described, and for the purposes set forth.

JAMES B. CLARK.