US1608507A - Tie plate - Google Patents

Description

Nov. 30 1926.

G. M. HOGAN TIE PLATE Filed July 14, 1926 Fries.

l V. f i 1 a i j l i i i i ,Lnns (MANUFACTURING 1' or rnnirrors.

Gnoaen 1a, r-roean, orotrroaeopi triiers, asst-anonre COMPANY, or CHIC-AGO, rmlmors, a eenroua'rr 'I'IE PLATE.

Applieation filed July 14, 1926. Serial No. leases.

pressions will assist the embedded rid es in 1.

eiiectively preventing lateral movement or the plate on the tie.

This invention relates to an improved tie-plate as used by railroads for supportmg the rails upon the wood ties. These plates provide a broad supporting surl ate One ob'ectol the inventionwis to provide for the rail, and prevent the rail trom a simple, eiiicient and durable tie plate,

working down into the ties, and also assist the spilres in transferring the lateral thrusts of the rails to the ties, and hence to the roadbed.

It is not unusual to camber or arch the upper face of the plate in a direction longitudinal of the rail supporting surface so as to accommodate the wave-motion oi the rail as the load rolls thereover. It is also customary to provide ribs or projections of some sort on the lower face or the tie plate, which are pressed into the wood tie and hold the plate against lateral movement. These ribs are] usually of a wedge shaped cross section, and the fairly sharp corners formed where the base of the ribernerges from the fiat bottom surface ofthe plate, act to grip the wood which has been co pressed between adjacent ribs, whereby the fibre is severed and the wood is broken away from the tie.

According to this present invention, the plate is not only arched or cambered on its upper surface, but is correspondingly cambered on its lower surface so that the plate will he or substantially equal thiclilower or g g g surface h p ness from side to side thereof. For reag. 3 l g i a V i al t ler. sons hereinafter explained, the lower can: k n bstantially on the line 3-3 of her will usually be somewhat greater than Fig. 2. j the uppercalnher; a plurality of crossed igi a s rs er ic se ti o i t secting ridges are form d 1 1 the taken substantially on the line l e of n 4 lov surface or the plate, the projecting 2, thatis, in a direction longitudinal er the edges of these ridges lying s'uhstantially in rail-supporting surra the plane oi the side edges ,oi the" plate" In Fig. 5 is a view similar to other words, these ridges will have a total tially broken-away), and-l. height varying from Zero at the edgesot' i-a ly on the line a e of th pl tto the height oi the total curva- Figs 6 and 'i are similar vertical sections t of th lowe c be git the nt r f takensubstantially on the lines (3'6 and the plate, The widely flaring curved sides 7-7, respectively, of l ig, 2. oi these ridges merge into the bottoms f As indicated in the drawings, the tie the cupped shallow le rgsijoas f rm d b plate 1 is of the usual rectangular outline. tween the ridges. The botto s, of th s having an upper rail-sapportingsurface f2 depressions are substantially tangent to, side flanges S and hand being punched 5 or form part of the lower cambered surface t accomm date the spikes 6, whereby tic f th ti late, These shallow curved deplate 1 and the rail 7 are anchored to the pressio'nswill not grip the fibres of the tie 8. An upstanding rib or shoulder S) wood so as tohreak thein loose, and the low, bears against one side edge oi the rail base, wide spreading ridges will be forced into {usually the outer side of the r ii), to ta.

' i the fibres; V 'lhe up the spreading thrust imparted to the rail the wood without out i j V suction created in the shallow rounded. deby the trainsvpassing thereover. oi the having an improved tie-engaging surface adapted to grip the tie and prevent lateral movement or the plate thereon without unduly injuring the tie.

Another object is to provide a tie plate having an arched or eamhered upper rail supporting surface, and a lower surface adapted to evenly engage the flat upper sur iiace of ti Y but so recessed that a st tially even distribution oi metal is efi ecter throughout the area of the tie plate;

Another object is to provide an improved tie plate oi? the character noted above, which may be easily and economically manufactured, and which is lighter, that is, requires less metal than those heretofore in use, with out sacrificing strength or rigidity.

Other objects and advantages of this in vention will he more apparent from the following detailed description of one approved form of thetie plate.

In the accompanying drawings:

Fig. 1 is a plan view of the tie plate in use-between a rail and tie.

Fig, 2 is an enlarged plan view of the JJI llli

above is of the usual approved construction. The upper rail-supporting surface 2 is cambered or arched in a direction longitudinal of the rail and of the rib 9, the amount or curvature of this camber being indicated at 03 in Fig. 4.

The lower surface of the plate is also sub stantially arched or cambered, as indicated by the dotted line 10 in Figs. at and 7 The amount or curvature of this camber is indicated at y in Fig. l, and it will be noted that this camber is usually greater than the camber ity of the upper surface, for reasons hereinafter explained.

The lower surface of the plate does not actually conform to the curved surface indicated by dotted line 10, since this lower surface is provided with a plurality of crossed or intersecting ridges 11, which form a checker-board pat-tern as indi'ated in Fig. 2., These ridges have widely flaring or diverging curved sides, which mer into the bottom surfaces of the shallow cupped depressions 12, the edges of which are do' fined by these intersecting ridges.

Each of these depressions 12 is cupped out in such manner that no sharp angles or corners are present in any portion of the depression. While the exact. curves used may be varied, it is preferable to have the depressions curved from side to side as an arc of a large circle, as indicated in Fig. 6.

The corners which might otherwise be formed at the junction of the two crossing cylindrical surfaces, are filled in as indicated in Fig. 7, at 13, so that the entire shallow depression approaches closely to a section of a spherical surface, which is slightly distorted so that the ridges 11 which outline the depression will form a rectangle with the projecting edges of the ridges lying in the plane of the lower side edges of the tie plate, 7

It will be noted that the depressions 12 at the center of the plate are deeper than those at the side edges of the plate, the bottoms of all of these depressions being tangent to, or forming part of the imaginary curved or cambered. surface 10, all as clearly indicated in Figs. l, 5 and 7; The result is to approximate a lower curved or cambered surface provided with a series of outstanding ridges, the projecting edges of these ridges all lying in the plane of the side edges of the tie alate. Since the lower cur vature or camber y is greater than the upper curvature or camber w, the thickness of the main portion of the tie plate will be somewhat greater at the edges of the plate than at the center. However, the projecting ridges ll are higher and thicker at the center of the plate than near the edges thereof, so that the total amount of metal and strength of the plate, is approximately the same at the center as at the edges. The

lower surface of the tie plate, instead of being provided with sharply projecting ribs, is provided with a mildly fluted or Wavy surface, the projecting portions of which will be embedded in the wooden tie by the load sustained thereon, without cuting or unduly injuring the fibre of the wood, Since there are no corners in the depressions to grip the embedded wood, but this wood is merely compressed to varying degrees by the gradually rounded bottoms of the depressions, there will be substantially no tendency to break loose the em bedded portion of the tie. At the same time, the interlocking surfaces, aided by the suction created inthe cupped depressions 12, will be ample to prevent lateral more ment between the tie and tie-plate.

It is desirable in the interests of economy,

to reduce the weight or amount of metal used in each tie plate as much as can be done, without sacrificing the strength or "d't fth lt T 'tl' 'tl 11g1 1y 0 e p a e. o (.0 11s, 1 1e: been customary heretofore to hollow out portions of either the upper or lower surfaces of the plate, to remove metal where it was believed that the same could best be spared. It will be noted that in this improved tie plate the desired arch or camber has been provided upon the upper surface of the plate, and at the same time material has been removed from the lower surface of the plate in such manner as to provide an improved gripping surface, and at the same time approach a cambered lower surface, similar in curvature to that of the upper rail-supporting surface. The plate is of substantially uniform strength and thickness throughout, a minimum of material is used, and the tie-engaging surface is so designed as to firmly grip the tie without injuring it. r

This form of plate may also be rolled from thinner material, since, due to the cambered construction, the actual thickness of the metal throughout the plate is considerably less than the apparent over-all thickness of the plate. At the same time, the arched construction formed by. the intersect ing ridges strengthens-the central portion of the plate, so there is no likelihood of thc plate flattening out under loads.

Some of the broader features of this invention are disclosed and claimed in my copending application Serial 108,049, filed May 10, 1926, the claims in this present application being limited improvement over said prior invention.

I claim:

1. A tie-plate having its rail-supporting surface longitudinally camberecl, and having its tie-engaging surface formed with a plurality of depressions the bottoms of which substantially form a surface of ourvature similar tothe camber of the plate. 7

Pill) lid to the features of Q 2. A tie-plate having its rail-supporting surface longitudinally camber-ed, and having its tie-engaging surface formed with a plurality of hollow cupped depressions the bottoms of which are substantially tangent to an imaginary surface of curvature similar to the camber of the plate.

3. A. tie-plate having its rail-supporting surface longitudinally cainbered, and having its tie-engaging surface formed with a plurality of shallow cupped depressions the bottoms of which are substantially tangent to an imaginary surface approximately parallel to the upper cainbered surface of the plate.

l. A tie plate having its upper and lower surfaces similarly cambered, the lower surface being provided with a series of pro jecting ridges which define shallow depressions therebetween, the projecting edges of the ridges lying in substantially the same plane, and the bottoms of the depressions being substantially tangent to the lower cambered surface of the plate.

5. A tie-plate having its upper and lower surfaces similarly cainbered, the lower surface being provided with a series of projecting ridges which define shallow depressions therebetween, the projecting edges of the ridges lying in substantially the same plane, and the bottoms of the depressions forming the lower cambered surface of the plate.

6. A tie-plate having its upper and lower surfaces similarly cambered, the lower surface being provided with a series of intersecting ridges which outline shallow depressions therebetween, the projecting edges of the ridges lying in substantially the same plane, and the bottoms of the depressions forming the lower cainbered surface of the plate.

7. A tie-plate having its upper and lower surfaces similarly calnbered, the lower sun face being provided with a series of inten secting ridges which outline shallow depressions therebetween, the projecting edges of the ridges lying in substantially the same plane, and the bottoms of the depressions being substantially tangent to the lower cambored surface of the plate.

GEORGE M. HOGAN.

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