US831755A - Rolled girder. - Google Patents

Description

W/TNESSES;

No. 831,755. PATENTED SEPT. 25, 1906. A. VIETOR 8: G. HUSHAM.

ROLLED GIRDBR.

APP LIOATION FILED APR. 12, 1902. RENEWED FEB. 1, 1906.

FIGI.

ATTORNEYS.

m: NORRIS PETER: ca., wAsHmm'ou. n. c,

UNITED s'rArEs PATENT orrrcn.

ALWIN VIETOR, OF WIESBADEN, AND CARL HUSHAM, OF OSNABRUGK, GERMANY.

ROLLED GIRDER.

Specification of Letters Patent.

Patented Sept. 25, 1906.

mlication filed April 12,1902. Renewgd February 1, 1906. Serial No. 298,966-

Tu all 1072,0771, it may concern.-

Be it known that we, ALwIN V1EToR,of Wiesbaden, and CARL HUSHAM, of Osnabruck, Germany, have invented new and useful Improvements in Rolled Girders and the Like, of which the following is aspecification.

In rolling flat plates and flat bar-iron and, in general, in rolling those products both of whose groove-bounding lines to be turned in the upper and lower rolls of a reversing-mill, or in each of the two rolls lying together in a three-high mill are substantially parallel straight lines, the rolling pressure11o matter in what thickness the ironis to be rolledis so distributed uniformly over the whole breadth of the section that by repeated passes of the bar through one and the same groove-opening, which by approach of the two rolls each time can always be made narrower without the bounding lines being changed, such flat sections can be rolled. With all hithertoknown sections of multiple or single web girders, where the material is, as far as possible, so distributed that near the neutral fiber there is little, and, on the other hand, near the places of the section farthest from the neutral fibers there is much, material this is not the case. On the contrary, the rolling pressure is there well distributed only when the rolls are exactly adjusted corre-' sponding to the groove. The flat plates, flat bar-iron, and the like referred to, in sections bounded by parallel substantially straight lines, are furthermore the only known forms which can, in the direction of the rolling pressure, be laid or piled up on one another to any desired height, so that they cover with large contact-surfaces without interstices between each two successive sections lying upon one another that is, so that they fit together. This is also not the case with any of the high-webbed sections of girders or rails at present used. If, for instance, several rails of the same section, several U-irons, or several corrugated iron plates of ordinary sections of the same rolling are laid in any manner upon each other there is never obtained an absolutely-closed pile, the rolling-section surfaces of which fit together throughout the breadth of the section. In constructional work, however, there are numerous cases in which it is of the greatest advantage if high webbedand therefore, as regards full utilization of the metal, or saving in weight, more perfectgirder-sections, on the one hand,can be rolled, and, on the other hand, are capable of being piled one upon the other or one over the other in any desired number, fitting together without any interstices with large contact-surfaces and with rolling pressure quite or as far as possible uniformly distributed over the breadth of the rolled section. Such new forms of girders, rails, and the like (pile-section girders, as they may be called) form the subject of the present invention. These girders are char acterized by their sectionbounding lines composed of several variously running straight or partly-bent lengths, being practically alike, so that on piling up the sections one upon the other or one over the other the lower surface of each upper piece covers the upper surface of the piece of like section lying below it in the breadth of the section or groove.

In the annexed drawings, Figure 1 is a geometrical diagram illustrativeof the invention. Fig. 2 shows in section a two-webbed rail with like sectioned plate capable of being piled. Fig. 3 shows several multiple webbed girders of piled section lying one upon the other, of which the lowermost reposes on its ends, while the uppermost and shortest is loaded in the middle.

The new and peculiarly-piled sections will be obtained geometrically if one imagines a straight line 0 Q, Fig. 1, vertical to the rolleraxis moved until it coincides with a parallel line O Q in the same plane, the two points 0 and Q of the traveling line thus describin equal linesfor example, the lines 0 O 0 0 O and Q Q Q" consisting of several differently-directed straight or bent separate lengths. Every other point of the moved lines also describes a line equal to theme. g., P P P P P.

Each of the surfaces 0 0, P P, or P P Q Q is a section capable of being piled, as explained. Imagine the surface 0 O P P to be a rolled section, the line 0 O O O 0 turned in the upper roll, and the line P P P P3? in the lower roll, the axes of the rolls vertically cutting the straight lines 0 P and O P. It is clear from Fig. 1 that the thickness measured in the direction of the lines 0 P and O P of the section at each place of the grooves is equal to the length 0 P or O P, so that it is possible to roll girders of such strips.

one another,

sections wvith the same rolling pressure throughout the whole breadth of the section." Furthermore, from Fig. 1 it can be seen that (and how) girders with such sections of the same form can be piled up, into one another. It is only necessary to regard O O P P as the section of the one girder and P P Q Q as the like section of a second girder. The capability of being piled is solely dependent upon the uniformity of the upper and the lower line bounding the 0 special arrangements being necessary, in the simplest manner riveted or bolted with lapoints, or connected with butt-joints, pieces of the same section being employed as butt- To construct girders of double or multiple strength for building purposes from a stock of bars of a definite piled section, it is only n'ecessary to lay two or more of the bars closely u on or over one another. Such piled gir ers can be made with any desired number of webs. In grooving the rolls it is best to take into consideration from the first the wear to be expected of the parts most eX- posed to friction and to correspondingly thicken or strengthen the rolls at parts eX- posed to wear; but any deviation from the proper form which fitting upon and I would cause projections at the section as well as at the rolled girder must be carefully avoided.

For railways, where it is a matter especially of cheapness of structure, together 5 with maximum of durability, (for instance, especially in the case of ortable and small branch railw'ays,) the pfled stock removes! the inconvenience in having to provide for x the various special sections for-the rails and go fish-plates for manufacture of the superstructures. The short waste lengths in the manufacture of rails can be employed to form fish-plates or saddles of great strength at the joints. Shorter lengths of the same section can be used as chairs or saddle-supports.

Having now described our invention, what we claim, and desire to secure by Letters Patent, is

1. A girder, channel-iron or the like having its upper and lower faces of identical dimensions and shape whereby a plurality of said girders may be piled one upon the other, the longitudinal edges of said girders being parallel and lying in planes parallel to the line of the pile whereby a plurality of piles may be laid side by side without intervening spaces W.

substantially as described.

2. A girder, channel-iron, or the like, hav- 7o ing flanges and webs inclined to each other,

the thickness of the flanges and webs being the same on lines parallel with the edge of the flanges substantially as described.

In wltness whereof we have hereunto set our hands in presence of two wltnesses.

ALWIN VIETOR. CARL HUSHAM. 1

Witnesses:

F. S. BEYER,

FR. HOYERMANN.

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