US882321A - Method of rolling ribbed bars. - Google Patents

Description

PATNTEDMAR. '17, 1908. T. w. JBNKS. METHOD OF ROLLING RIBBED BARS.

APPLICATION FILED APR. 2, 1907.

2 SHIJBT8-SHBBT l.

I L I I 1 I WITN ESSES H m 882,321. PATENTED MAR. 17, 1908.

T. W. JBNKS. METHOD OF ROLLING RIBBED BARS.

APPLICATION FILED APR. 2, 1907.

2'SUEETSSHEET 2.

WITNESSES INVENTOR THOMAS W. JENKS, OF AVALON, PENNSYLVANIA.

METHOD OF ROLLING BIBBED BARS.

Specification of Letters Patent.

Patented March 17, 1908.

Application filed April 2,1907. Serial No. 365,931.

To all whom it may concern:

Be it known'that I, THOMAS W. JENKs, of Avalon, Allegheny county, Pennsylvania,

- have invented a new and useful Method of Rolling Ribbed Bars, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, forming part of this specification, in which Figures 1, 2 and 3 are views illustrating the three successive passes used in my method of rolling ribbed bars; Figs. 1 ,2" and 3 are erspective views showing portions of the ars, as they leave the respective passes of.

Figs. 1 2 and 3. the finished bar. I

My invention has relation to a novel method of forming metal bars for use in concrete reinforcement, and more particularly to a method of rolling bars'having two or more continuous longitudinalribs or projections, with bracing ribs or projections connecting thelongitudinal'ribs or projections and forming a series of pockets or depres- 'sions for bonding the concrete to the bar.

Priorto my invention it has not been considered'practicable or possible to roll a bar of this form, owing to the difficulty of forming the continuous longitudinally-extending ribs or rojections and the cross or connecting projections; 'and my invention consists in the method whereby this object is successfully and commercially accomplished-- In accordance with my invention, I take a billet of approximately rectangular .cross section and pass it through a pair of rolls having a pass such as shown in Fig. -1 which Fig. 4 is a cross-section of receives the billet in a diagonal position.

This ass has a horizontal dimension greater than Its vertical dimension, so that the billet as it passes therethrough is somewhat llattened into a cross. section oi diamond or lozcnge form, as shown in Fig. 2 the opposite horizontal angles or corners being by the same 0 eration provided with continuous longitut inally-extending ribs or projections 2, as shown in Fig. 2, due to the lateral llow of the metal.

The bar or blank is next entered into a roll pass having the form shown at 3 in Fig. 2, and in which the vertical axis or dimension of the blank is furtherreduced, and its horizontal axis or dimension is increased, the longitudinal ribs .or projections 2 being further extended and developed. This pass is also provided with the roll grooves -l which form corresponding ribs or projections at the upper and lower corners of the bar, as shown 1n Figs. 2 and 2.

The bar is next entered into the third and finishing pass, shown in Fig. 3, being introduced in this pass with its greatest dimenslon extending vertically. T his pass which is shown at 6 in Fig. 3 is of approximately rectangular cross-sectlon.

The pass-forming groove 1n each roll 1s of V form with circumferential grooves 7 at Its bottom similar to the groove 4 of Fig. 2, and both sides of the pass are formed with the cross grooves 8 which extend into the circumferential groove. In this pass, the previously-formed ribs or projections 2 engage the circumferential grooves 7, and the vertical axis is reduced, while the horizontal axis is increased, the excess of metal provided by the reduction of the vertical axis being forced outwardly into and. filling the cross grooves 8 of the ass, to thereby form the bracing ribs 9 of Figs. 3 and 4. In this final pass, the longitudinally-extending ribs or projections 2 are finished by the circumerential grooves 7 of the pass, while the other two ribs or projections 5 are finished by the lateral flow of the metal between the ointsof the rolls.

The advantages of my invention result from the fact that by the method described T provide in the first and second passes such a disposition of the metal in the blank that in the final or finishing-pass an excess is provided which is caused by the vertical. pressure of the rolls to flow laterally into and completely fill the cross grooves, to thereby form the connecting ribs. That is to say, instead of rolling depressions in the surfaces of the blank, I positively force the metal outward and laterally to form these ribs. In

this manner, I am able to preserve the "confect and mechanical bond for uniting the' concrete to the bar.

While I have shown and described my improved method in connection with the formation of a finished bar having an approximately rectangular shape, it will be obvious.

i first-named ribs or projections; substantially that the invention is not limited thereto, but

ofjwdiamond" or lozenge shape in cross-section with acontinuous ri-b'f o'r projection at each of its angles, and having one of its axes or. dimensions reater than the other, and then rolling said lank between die rolls to effect a reduction 1n which its axes are approximately equalized, and the excess of metal is caused to flow laterallyto form ribs or projections at substantially right angles tothe as described.

,2. The "'gmethod of shaping metal bars,

which consists in rolling a blank of lozenge or diamond shape 1n cross-section to increase one ofits dimens ons 'and reduce its other dimen'sion,.andcausing the excess of metal to flow laterally intocross-grooves which are in the walls forming the passes of the rolls so as to form ribs or rojeotions extending approximately at rig t angles to the longitudi- .fnal axis of the bar substantiallyas described. 3. The method of forming metal bars having longitudinally-extending ribs or projections at its angles, and other ribs or projections connecting the same at approxiv mately right angles, which consists in forming a blank or shape of diamond or lozenge form in cross-section, with one of its cross axes or dimensions greater. than the other, and having a continuous longitudinally-extending rib or project on at each of its angles, and then rolling said shape between A die rolls to approximately equalize its two v -metal laterally outward between the longi-' described.

axes or dimensions, and force the excess of tudinal projections at recurring intervalsin the form of connecting ribs; substantially as 4. The method of formin metal bars having transversely ribbed sur aces, which consists' in rolling a blank of diamond shape in grooves in the walls of the roll passes so as to form successive spacedribs; substantially as described.

5. The method of rolling ribbed bars, consisting in forming a blank of substantial lozenge shape with at least two longitudinal ribs at its corners or angles, and having one axis greater than the other, and then reducing one of its axes and increasing-the length of the other between rolls having grooved portions in thewalls, which form the sides of the roll passes, and thereby forming crossribs or projections thereon in said pass; substantially as described.

6. The method of forming a bar having a body portion and projecting portions integral therewith, which consists in utilizing a blank having a cross-axis longer than the corresponding axis of'the bar to be formed therefrom, and a second cross-axis which is substantially at right angles to the first mentioned cross-axis of a length which is less than the corresponding cross-axis through the body and projecting portions of the aforesaid bar, subjecting the said blank to the action of rolls, having grooved passes between them and recessed portions inthe walls which form the sides'of the roll asses, in sucha way that the cross-axis o the said blank is reduced while the length of its second cross axis is increased and simultaneouslytherewith the metal is forced laterally into the said recessed portions; substantially as described In testimony whereof, I have hereunto set my hand THOMAS W. JENKS. Witnesses:

GEo. B. BLEMING, JOHN MILLER.

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