USRE1917E - Improvement in bolts - Google Patents

Description

UNITED STATES PATENT OFFICE.

WILLIAM J. CLARK, OF SOUTHINGTON, CONNECTICUT.

IMPROVEMENT IN BOLTS.

Specification forming part of Letters Patent No. 43,669 dated August 2,1864 autedatcd February 2, 1864 Reissue No. 1,9l7, dated March 28, 1865.

DIVISION B.

To all whom it may concern Be it known that 1, WILLIAM J. CLARK, of the town of Southington, in the county of Hartford and State of Connecticut, have invented a new and useful Improvement in the Manufacture of Bolts from Round Rods or Bars; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 represents a view of the dies opened up, and in which the bolt in question may be formed. Fig. 2 represents the front or anvil end of the dies. Fig. 3 represents the rear or cylindrical end of the dies. Fig. 4 represents the bolt as complete and of one form of head; but I do not confine myself to any particular form of head.

The nature of this part of my invention consists in the production'of a bolt made fromy a round bar or rod, a portion of which bolt is square'or angular and a portion left round, as in the rod or bar, the sectional areas of the two portions being similar, though of different forms and dimensions-as, for instance, the round portion is of greater diameter than the distance from face to face of the square or angu lar portion, and the distance diagonally from corner to corner'of the square or angular portion is of greater length than the diameter of the'ronnd portion, the displacement and rearranging of the metal in the blank to thus shape the bolt being accomplished mainly by lateral pressure or compression of the dies.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the'drawings.

l construct a pair of dies, A A, of cast-iron or other metal, making the grooves therein for a portion of their length of a semicylindrical form, as shown at a, and the remaining portion b of an angular form. Each die A being provided with a groove of this character, will permit the two, when placed together, to present at one end a cylindrical opening corresponding in diameter to that of the cylindrical bolt-blank, while the opening at the opposite end, instead of being cylindrical, will be square or angular, but of similar sectional area as that of the cylindrical end, so that when the two, dies are forced together upon the bolt-blank, (which has been previously heated to a proper degree,) that portion of the blank lying within the angular portion of the grooves will be swaged out and forced to take the angular form corresponding to that of the angular portion of the groove, and the part lying within the cylindrical portion of the groove will retain its original shape. The dies thus holding and containing the partially-wrought bolt-blank form au anvil upon which a portion of the blank projecting from the dies, and at the end thereof which contains the angular groove, is upset and formed into a head by any proper machinery that willl drive said projecting portion of the blank toward the body or shank of the bolt and give it the desired shape or form. The square or angular grooves in the dies are of such length as will give the required square or angular form to the bolt, and thence merging into the semieylindrical form of the grooves in the dies, which are made to conform to the size of the rod to be used in them.

B, Fig. 4, represents a bolt made in the dies and after the hereindescribed manner of procedure. lts round and its square or angular portions are of similar sectional areas; but the diameter of the round portion is greater than the distance from face to face on the square portion, as shown by the round and square or angular openings in the dies, while the distance from corner to corner diagonally of the square portion of the bolt is greater than the diameter of the round portion, so that the sectional areas of the two portions may be the same, while their forms are changed by the act of making the square or angular portion in the dies.

It will be perceived by reference to Figs. 1 and 4 that the lines of the square or angular portion of the grooves in the die give a somewhat dilferent form to the lines of the square or angular portion of the bolt made or shaped in said grooves. This effect is caused by the upsetting or driving in of that portion of the.

blank that forms the head of the bolt either by slightly springing the dies or by forcing dies, or by both, so that While the square or what I claim under this patent isangular portion of the bolt is formed mainly l A bolt made from around rod or bar, a porby the lateral com pression of the dies, yet tion of which bolt shall be square or angular some portion ot' it is attained by driving up and a portion round, as in the rod. or bar, and the metal into lthem in the act of forming the so that the sectional areas of the square and held. round portions shall be similar, the diameter The pulling up of the square or angular porof the round greater than the distance from tion of the shank of the bolt immediately unface to face of said square portion, and the vder thc head is notintentional, but is due, as distance from corner to corner diagonally of above stated, to the upsetting or driving in of the square portion be greater than the diamethe projecting end of the blank to form the ter of the round, substantially7 as described.

some portionof the metal endwise into the l Having thus fully described my invention, i

head,and is incident to the operation of head- WM. J. CLARK. ing the bolt, and thoughlhave laid no special Witnesses: claim to it, yet it is from consequence a 'part A. B. STOUGHTON,

of the result attained by that operation. HAVER. FENDRICH.

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