US409047A - David larkin - Google Patents

Description

2 Sheets-Sheet 1.

INYENIUH Patented Aug 13, 1889.

(No Model.)

WI IE'NZEEE-IEE' 2 SheetsSheet 2.

(N0 M06151.) I v -D. LAB-KIN.

MAKING STRAP 0R H001? IRON.

Patented Aug. 13, 1889.

METHOD 0? WIENEEEEE- INY'ENIEJIH afiwww- MM ml/ UNITED STATES PATENT OFFICE.

DAVID LARKIN, OF PI'l"Sl-3URG, PENNSYLVANIA, ASSIGNOR TO HIMSELF, JOHN l3. LARKIN, AND FRANK D. LARKIN, OF SAME PLACE.

METHOD OF MAKING STRAP OR HOOP IRON.

SPECIFICATION forming part of Letters Patent No. 409,047, dated August 13, 1889. Application filed January 18, 1889. Serial No. 296,743. (No model.)

To all whom it may concern.-

lle it known that 1, DAVID LARKIN, a citizen of the United States, residing at Iittsburg, in the county of Allcghenyand State of Pennsylvania, have invented certain new and useful Improvements in Methods of Manufacturing Strap or Iloop Iron; and I do hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the accompanying drawings, which form part of this specification.

My invention has relation to the manufacture of hoop, cotton-tie band, or other kinds or qualities of metal-work produced by the reduction of the material from the billet to a long, narrow, and thin strip by passes through successive or a continuous train of reducingrolls.

The obj ect of my invention is to greatly facilitate the reduction of the metal by obviating and overcoming the difficulties heretofore experienced in handling or working the material during its progress through the rolls, and to thereby reduce the cost of production as well as improve the texture of the finished product.

llerctot'ore, by'reason of the frail teXtrn-o light gage, and semi-liquid condition of the metal during the pro ess of reduction, it has been impossible, without manual assistance and skillful manipulation, to effect a delivery of the end of the blank after emerging from one set of rolls to the slot or opening in the next set, while even after the delivery has been accomplished the excess of material between the rolls, resulting from the elongation of the blank, buckles, vibrates, warps, and sways about in a zigzag course, so as to be comc-practically unmanageable, thus rendering the manufacture of the grades of metal referred to impracticable with continuous rolls, and necessitating the employment of hand-labor and the reduction of power and motion.

According to the method or process now practiced for the reduction of metal from the billet to the long strip, band, or hoop blank, the material is passed alternately to and fro and from right to left or left to right between a single pair of rolls, or is shifted from one pair to another. This operation is slow and tedious and subject to many diflicultics, which need not be enumerated.

According to the objects of my invention I purpose placing a number of sets or trains of rolls located at regular or irregular intervals of space with direct reference to the aec0mmodation of the accumulation of or surplus metal that gathers between the rolls during the reduction, and geared or interlaced so as to feed the material with a continuous motion in one direction from the start to the finish.

My invention or improvement in the art of rolling or reducing the metal lies in the special provision I have made to stiffen or brace the material during the intermediate stages of the process, so as to facilitate and insure its proper delivery from one set of rolls to the other. This provision consists, broadly, in imparting to the blank a lateral]y-eurved, dished, concaved, or corrugated shape by means of two or more sets of intermediate rolls of the desired configuration, male and female, whereby the surplus or accumulation between the rolls will be rendered sufficiently rigid and self -sustaining to prevent undue buckling, swaying, twist ing, or distort ion, and insure delivery from one set of rolls to the succeeding set, the last set being so constructed as to reduce the dished, concave, or corrugated material to a flat surface, as required ii -finishing.

Incidental to the sets of rolls constituting a continuous train or mill, and adapted to the conditions stated, I purpose using and arranging between the sets of rolls which impartto the stock a concave or dished form, and maintain this shape, a series of horizontal platforms, tables, planes, or guides, which are dished or curved to conform to the dish or curvature of the blank or corresponding fetheir guiding proper ties and positions the delivery of the metal from one set of rolls to another, said platforms or planes constituting in effect a continuous track-guide or conduit for the passage and guidance of the material from the starting to the final or finishing pass.

In the accompanying drawings, Figure 1 is a Vertical longitudinal section of a rollingmill or continuous train constructed and adapted for carrying my invention into eftect. l ig. 2 is a Front elevation of a set of rolls, respectively male and female, con structcd and adapted to dish or concave the blank. Fig. I} is a perspective view of: a section. of the blank having the dished or concave l'orm. Fig. 4: is a similar view of a section of the linished stock or blank. Fig. 5 is an elevation of the Fin-reducing rolls.

Fig. 1 of the drawings shows live sets of rolls; but any suitable or convenient number may be employed.

The rolls are mounted in housings in the ordinary way and provided with such appurtenances as are common and necessary in continuous-rolling mills.

In practice the dishing ot' the blank should begin after the first pass and should be gradual, and may even advantageously begin with the first set of rolls A. The dishing or concaving may, however, begin with any set of rolls, and continue either uniformly or by gradual increases until the lastset E has been reached. All the intermediate sets I: C D will usually be shaped to dish or bend the blank laterally, and the conformation or shape of the rolls is adequately shown in Fig. 2.

It should be understood that I do not conitiue myself to any particular bend, dish, or other lateral deflection of the metal from a horizontal plane, but show the concave dishin g or segmental shape merely as an illustration of the general idea or principle upon which my invention is based.

1 I I J K designate, respectively, theplancs, tables, or guides located between the sets of rolls and grooves longitiulinally to receive and guide the metal from one set to another. These grooves are of a shape, width, and depth conformable to the curved or dished varying shape, width, and depth of the stock and re quire no detailed description.

In rolling metal according to the process above described a fine tin or head gradually gathers or is formed on the edge of the blank, and this should be disposed of before the blank is finally straightened or flattened.

1 make adequate provision for the reduction and obliteration of the lin by the use of the pair of rolls, which may be located between the last reducing set and the flattening-rolls. The finrcdncing rolls are shown in Fig. 5, and consist of a plain roll G and a slightly-grooved roll 11. The groove L is rectangular and nearly equals in Width the desired width of the finished product. The blank being contracted laterally by reason of its bent or deflected form easily enters the groove, and by the compression or impact of the plain roll has its rough or finned edges forced into the angles of the groove and the fin or head compressed into the body of the blank or reduced to a condition conformable to the rcquirements of finish and good workmanship.

Ilaving described my invention, I claim In the manufacture of hoop, band, or strap metal by reduction through successive rolls, the method of rendering the stock self-sustaining and facilitating its delivery from one set of rolls to another, which consists in laterally bending, dishing, curving, or corrugating the blank during its reduction and finally tlatteningthe same,snbstantiallyas described.

In testimony that I claim the foregoing I have hereunto set my hand this 14th day ot. January, 1889.

DAVID LARKIN.

Witnesses:

WM. F. Lmosnv, .TAS. G. BELL.

Images