US172459A - Improvement in the manufacture of bolts - Google Patents

Description

. improvement.

lUNITED STATES PATENT @Errea WILLIAM J. LEWIS, OFPITTSBUBG, PENNSYLVANIA.

IMPROVEMENT IN THE NIANUFACTURE OF BOILTS.

Specification forming part of Letters Patent No. 172,459, dated January 18, 1876; application filed October 20, 1875.

' like parts- Figure l is a view in perspective of the operative ends of a set of dies illustrative of my Fig. 2 is a perspective view of a plate from which the bolt-blanks are severed. Fig. 3 is a like view of one of the blanks, as out. Fig. 4 shows a blank headed. Fig. 5 illustrates the next step of a rounded stem. Fig. 6 shows the finished article, and Fig. 7 shows the gripingdies of Fig. l, made with V-sbaped, instead of square, grooves.

My improvement relates to the manufacture of bolt-blanks and bolts, and more particularly carriage-bolts, by severing the blank from the end or edge of a metallic plate, and compressing a round stem and upsetting a head thereon.

In carrying out my invention I roll out, or make by suitable means, a plate of any desired thickness, according to'tlie size of blank desired. Such plate I trim or divide in the manner ordinarily practiced in preparing nailplates, but in such manner as to give a plate, A, one edge, a, of which will be of, any desired length, and ordinarily about as long as the bolt B to be made. In cutting these plates, Where the material is a fibrous metal,

the edge a, from which the blanks are out, preferably runs longitudinally with the fiber; but where the metal is noniibrous, or homogeneous, or is brous only to a slight degree, it makes little, if any, difference from which edge of the plate the blanks are cut. I then cut or shear, or otherwise sever, the blanks B from the parent bar or plate by the use of any suitable devices for that purpose, severing the blank so that its cross-section shall be a square or nearly so.

When making blanks for carriage or screw bolts I make the plate A (in general terms) of a thickness equal to one sideof the square of the shank b, and equal, or about equal, to the diameter of the rounded stern b', or to the diameter of a circle inscribed within the square of the shank b. Also, in such case I cut off for each blank a Width of material equal, or about equal, to the thickness of the plate, and lalso out the blank so that it shall be of uniform size through so much and such part of its length as goes to form the body of the stem, or of the shank and stem. Such blanks are then, or by one or more subsequent operations, caught byor placed within side gripingdies I) D of any suitable construction, with reference to giving tbe-desired forni to tbe ste-m b or shank b, and by one or more simultaneous or consecutive actions of such dies, while the shank b retains the form in cross-section of the blank, with but little, if any, change, the stein b may be rounded, as shown, these functions being secured by the round and rectangular or V grooves d ol'. The projecting end of the blank is then, or previously, upset into a head, b2, by a header, D2, or by other suitable dies, such as are einployed in bolt-heading operations. In this Way I produce, by mechanical means, the bolt B1, of Fig. 5, and only need to out the thread and add a nut to produce the linished article B3, shown in Fig. 6. By varying the forni of the groove d d any desired irregular or an gular shape may be given to the shank or stem b b1.

While I have shown the dies D Dl for purposes of illustration I do not in the mode of manufacture described limit myseltl specifically to these dies, nor to the conjoint action on 'the blank of these or other dies of like funcmade of uniform size to the extent abovel stated, and'headed, as in Fig. 4, by side grip- I claim as my inventiony 1. As an improvement in the art of making screw-bolts, severing the rectangular blank from the edge or end of a metallic plate, forming a head thereon, and shaping a rounded stem by lateral compression lin dies or other# Wise, substantially as described.

2. A headed bolt-blank, B4, made as described, and possessing substantially the characteristics specified, with reference to Fig. 4. In testimony whereof I have hereunto set my hand.

WILLIAM J. LEWIS.

Witnesses:

C. E. MILLIKEN, GEO. H. GHRIsTY.

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