US1093256A - Tie-plate. - Google Patents

Description

L. DILWORTH. TIE PLATE. APPLICATION FILED OCT. 12, 1910.

1,093,256. Patented Apr. 14, 1914.

LAWRENCE DIIJWORITH, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T IJILWORTI'I, PORTER & COMPANY, LIMITED, 0F PITTSBURGH, PENNSYLVANIA, A LIMITED PARTNERSHIP.

TIE-PLATE.

1,093,256. specification of Letters Patent! Patented Apr. ia, rare.

Serial No. 586,655.

Application filed October 12, 1910.

To all whom it may concern Be it known that I, LAWRENCE DILWORTH, of Pittsburgh, Allegheny county, Pennsylvania, have invented a new and useful Improvement in Tie-Plates, of which the following is a full, clear, and eXact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure l is an end elevation of my improved tie plate showing the rail in dotted lines. Fig. 2 is a bottom perspective view.

My invention relates to the claw type of tie plate, such for example, as shown in the Goldie Patents 540,306, dated June 4th, 1895; 607 ,847 dated June 26th, 1898, and

655,400, dated August 7th, 1900.

The object of the invention is to improve the structure of the plate, as well as cheapen and lighten it without impairing its value or functions.

The advantages of providing such tie plates with recesses extending longitudinally of the rail in the body portion of the the rib; and if two top ribs are used, the claws are inside both ribs. After the plate is thus rolled, the base flanges are slotted to form the claws 5, and the claws are then pointed and given a knife edge on their outer faces by cutters or dies, which act diagonally so that the edges 6 of the claws slope inwardly toward the longitudinal centr al aXis of the plate. The plate is also pro vided with spike holes shown at 7, and these holes may be located in any desirable manner, one of them preferably extending through the rib, if one rib 'is used, or through both ribs, if two ribs are used on the top.

During the rolling of the plate it is formed with longitudinal grooves or recesses 8 in its central portion, these preferably being formed in the top surface of the plate, though they may be formed in the bottom or partially in both faces. The number and dimensions of these grooves may be varied without departing from my invention. They may be continuous, or inplate are now well recognized in this termittent, but are preferably continuous so art. In the Goldie form of tie plate, howand extendlng longitudinally of the plate ever, this recessing has not been practicable, and the rail. The plate is also preferably owing to the locating of the claws near the side edges of the plate. On account of this positioning of the claws outside the rail base in prior tie plates, the central portion of the plate must be stiff and relatively heavy, so that in driving the plate by the traffic on the rails it would not be liable to buckle or bow downwardly in its central portion.

I have found that by locating the claws under the rail base, and arranging them so that they are all directly underneath some portion of the base flanges of the rail, I can provide the plate with longitudinal grooves, thus obtaining their advantages while retaining the advantages of the claws.

In the drawings, I show a plate 2 having side edges 3, 3. This plate is rolled with a plurality of longitudinal flanges on its bottom, these flanges being spaced inwardly to a sufficient distance to the side edges so that they will come beneath the rail base. I also preferably roll the plate with an upper longitudinal rib 4:, which engages the edge of one of the base flanges of the rail, though I may omit this rib or may roll two ribs on the top, one to engage each edge of the rail base. If one top rib is used, the

.55 claws on that side of the plate are inside chamfered or beveled at its side portions, as shown at 9 to make the edge portion thinner than the intermediate portions between the grooves.

The advantages of my invention will be obvious to those skilled in the art, since owing to the locating of the claws underneath the rail base, I am enabled to provide the plate with the longitudinal grooves or recesses, thus lightening it and giving the usual advantages of these recessed portions. In driving this plate by the traffic there is no tendency to buckle or bend, since the pressure comes direct on the claws which are underneath the plane of application of pressure.

It will be noted that I employ claws which are relatively short as to width but which are of considerable depth, the depth in all cases being considerably greater than the thickness of the ungrooved portion of the body of the tie plate. By using claws of this form, which will readily embed themselves to a very considerable depth in the ties, I obtain the necessary lateral resistance for holding the rails to the seat and thus maintaining the rails to a true gage. By locating these claws entirely underneath the base of the rail and relatively close to the center line of the plate, they not only prevent buckling or bending of the plate, but are also forced to their seats by the direct pressure of the rails.

Variations may be made in the form and dimensions of the plate, and the claws, without departing from my invention.

claim 1. A tie plate having projecting from its bottom face a plurality of relatively narrow, deep, rolled and sharpened claws, located underneath the rail base portion of the plate, substantially as described.

2. A tie plate having a recess or depression beneath the rail base, said plate having a plurality of relatively narrow, deep, rolled and sharpened claws projecting from M Copies of this patent may be obtained for five cents each, by addressing the rolled and sharpened claws sion beneath the railbase, said plate hav ing a plurality of relatively narrow, deep, projecting from its bottom face underneath the rail base, said plate having an upper longitudinal rib arranged to engage the sideedge of the railedge of the plate substantially as base and located nearer the than the sharpened claws, described. r

In testimony whereof, I have hereunto set my hand.

' LAWRENCE DILWORTH. Witnesses: j

GEO. H. PARMELEE,

H. M. CORWIN.

Washington, D. G.

Commissioner of Patents, 7

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