US3004715A - Bonded tie plate assembly - Google Patents

Description

Oct. 17, 1961 w. E. GADD BONDED m: PLATE ASSEMBLY Filed July 22, 1960 2 Sheets-Sheet 1 Illlbllll h INVENTOR. l//z//la/z? 627 5d A 7' TQ'RNEY Oct. 17, 1'961 w. E. GADD BoNDEn TIE PLATE ASSEMBLY 2 Sheets-Sheet 2 Filed July 22. 1960 y'ItI This invention relates to -a novel assembly for securely aiixing tie plates fto concrete ties a manner that the plates will not move relative to the tie.

[he relative movement between the tie, the plate, and the base of 'a Vrail is, as well known, 4due to the wave notion of the rails under rolling wheel loa-ds, and as a result of such movement the upper surface of the tie becornes charred. This is 'true with `respect to both wood ties and concrete ties.

Accordingly, 'one of the objects of the present invention 'is ft'o provide an integrated tie and tie vplate assembly particularly adapted to ties which are usually made of molded prestressed concrete. In that connection, both the bottom 'of Vuthe tie plate and 4the related upper surface of v'the tie are subjected to appropriate treating Vfor an adhesive.

Another object of the invention is to prepare the concrete tie construction to receive a special rail fastening assembly. For example, it is intended to provide the tie with specially formed rail fastening receiving cavities to hold a substantial amount of settable bonding adhesive which, when s et or hardened, forms an extended anchoring base for the lfastening and greatly augments the capacity 'of the fastenings to resist pulling loose under all traffic conditions. A further object is to provide a rail fastening having integrated structural features which serve the effective 'purposes of adequately anchoring the fastening in the tie after it is made instead of molding it in the tie when lit is made; and, also to render the head of the fastening adaptable to a rail Ybase flange engaging member such as a spring clip.

With the above, and other objects in view which will more readily appear as the nature of vthe invention is better understood, 'the invention consists Vin the novel construction, combination and 'arrangement 'of parts, hereinafter more fully described, illustrated and claimed.

A preferred and practical embodiment of the invention is shown in the accompanying drawings, in which:

FIGURE 1 is a partial side elevation of a portion of a tie, particularly the section showing the tie plate assembly assembled to the tie.

FIGURE 2 is a top plan view of the construction shown in FIGURE 1.

FIGURE 3 is a `detail side elevation of a preferred form of tie plate fastening.

FIGURE 4 is a top plan view of the fastening shown in FIGURE 3.

FIGURE 5 is a side elevation of the rail holding clip, per se.

FIGURE 6 is a rear elevation of the clip shown in FIGURE 5.

FIGURE 7 is a top plan view of the clip shown in FIGURE 6.

FIGURE 8 is a composite exploded view illustrating in perspective, the concrete tie, the steel tie plate, and a suitable insulation pad, saturated with adhesive and which may be interposed between the bottom face of the tie plate and the otherwise exposed upper related face of the tie.

Similar reference characters designate corresponding parts throughout the several figures of the drawings.

The concrete tie 1 which is cast and prestressed in any suitable fashion, is, during this stage of preparation,

3,004,715 Patented Oct. 17 1961 formed with fastening receiving sockets or holes 2. These holes are of substantially uniform diameter throughout when removed 'from the casting mold, but do not extend through the bottom face of the tie. T o insure firm anchoring o'f the rail fastening in place, the inner end portion of the hole is sandblasted along its sides to provide, as indicated at 2?, a pocket of any suitable shape for reeeiving the adhesive, 'forming in effect, a settable plug at the inner 'end of the fastening which will substantially contribute to the r'm embracement and holding power of the fastening, and -avoid imposing any concentrated upward force of the tie plate tending to break its adhesive ybond with the tie.

The Sandblasting of the hole 2 is preferably accomplished during the sand blasting of 'the surface 3 upon which the tie plate 4 is eventually placed with the adhe- `sive sandwiched between the bottom face of the tie plate and the tie. The tie plate -1 which supports rail R has openings Vregistering with the holes to receive fastenings 'as will presently appear.

The purpose of Sandblasting surface 3 is to remove dust, scale and any loose particles that would interfere with completely coating the surface with an vadhesive to lform an effective bond. It will, of course, be understood that, when it is stated that the adhesive coating A is applied to the surface 3, such coating may also be applied to the underside of the tie plate 4.

Referring more in detail Vto the fastening F it will be understood that any rail fastening suitable for the purpose 'may be used, nevertheless, in the interest jof obtaining great strength and firm anchorage for the fastening, a special type spike vor fastening is formed by suitable forging operations. In the preferred example shown the fastening is formed with a clip securing head 5, elongated in a direction at right angles to the rail, and connected by a neck portion 6 with a tie plate engaging head 7 which holds the bonded assembly mechanically secure.

The head 7 has a shank 8 which may Vbe of round or angular cross-section and whose lower por-tion is provided with a series of fins or annular serrations forming transverse shoulders, while at least one of the sides of the shank YS' is provided with a longitudinal groove. The purpose of the serrations I9 is to provide a 'plurality of anchoring shoulders or keys which, when Yfitted in the' hole 2, will be surrounded and embraced by the epoxy resin in its fluid state. The groove or channel 10 will assist in passing the fluid adhesive through and about the lower end of the shank 8, and will insure uniform distribution of the adhesive in a manner to fill the cavity 2a, and at the same time avoid the formation of air pockets or bubbles due possibly to the shank being inserted in the adhesive-filled hole 2.

The fastening F is intended to cooperate with a spring clip designated generally as C.

As will be seen from FIGURES 5, 6 and 7, this clip is provided at one end with a rail flange bearing portion 11 and at the other end is formed with a t-ie plate engaging tail portion 12. The horizontal edge of the tail of offset key 13 engages in the dimple or socket 1'4 as will appear from the drawing. The medial portion of the clip C is formed with an opening l5 which is elongated transversely of the clip body, that is, with its long dimension running parallel with the rail.

After the molding of the tie, the Sandblasting of the holes 2, the filling of said holes with adhesive, the application of adhesive to the tie and bottom of the tie plate, and the insertion of the fastening F in proper position, the adhesive is allowed to set or cure. The tie and bonded tie plate and fastening is then ready for use in the field.

The clip C will therefore be applied in the field with its opening 15 fitting over head 5 of the fastening and in a manner that the long axes of the clip is parallel with the I rail. The clip C will then be turned 90 and the protie' plate Athus enabling the clip to be guided to its final position. l

As shown in FIGURE 8, the tie plate y4 `may be assembled Vto thetie with a pad P sandwiched therebetween. The opposite faces of the pad may be coated with adhesive `or alternatively the bottom of the tie plate and Athe surface of the tie may be coated. The pad may be made of liber or other insulating material, and would be used in signal track sections where its insulating qualities .would be useful.

K `It will now be seenthat after the tie plate 4 has been adhesively connected with the tie plate, and the fastenings F have their Shanks 8 inserted in the pre-formed holes 2 and' embedded in the adhesive therein, the tie and tie plate aswell as the fastening are made secure so that while there may be some movement between the bot-tom face of the rail and the upper face of the tie plate, there willbe no movement of the tie plate relative to the tie or between the fastening and the tie plate. Therefore, a most rigid and adequate tie plate assembly is assured to have long maintenance-free life and also impart better ,riding quality of thevrolling stock on the rails.

I claim: p

v 1. Anintegrated tie and tie plate assembly, comprising, in combination, a molded concrete tie provided With pre-'formed holes whose inner ends may be enlarged and having its tie plate surface sandblasted in the area including said holes, a tie plate having openings to register with said hol-es, a layer of adhesive bonding the tie plate to the tie, and rail fastening means including a shank embedded in additional adhesive material iilling the holes, said rail fastening means having its shank provided with a plurality of`annular shoulders, and at least one longitudinal groove extending from approximately the tip thereof to approximately the mouth of the hole, an elongated head at the top of `the shank disposed when the fastening is sert in the adhesive to be at right angles to the rail, a spring rail engaging clip having its body provided with a slot to receivesaid head and to be interlocked therewith upon turning through an angle of 90.

2. An integrated tie and tie plate assembly, comprising, in combination, a molded concrete tie provided with preformed holes of greater width at the bottom than at the top, a tie plate having openings registering with said holes, a layer of adhesive bonding the tie plate to the tie, and driven rail fastening means including a shank embedded in additional adhesive material filling the holes, said shank of substantially the same diameter throughout and having a plurality of spaced annular shoulders of less diameter than the hole and providing at upper faces at right angles to the aXis of the fastening, said shoulders having lower side portions inclined toward said axis, and at least one groove extending longitudinally of the shank from the bottom thereof and across and beyond said shoulders to provide an air escape channel to open substantially at the top of a related hole whereby, air trapped inthe fluid adhesive will escape to insure irm anchorage of the fastening in the tie.

3. An integrated tie and tie plate assembly comprising, in combination, a molded concrete tie provided with preformed holes, a tie -plate having openings to register with said holes, a layer of adhesive bonding the tie plate to the tie and rail fastening means includinga shank for embedment in additional adhesive material in said holes, said rail fastening means having its shank provided with a plurality of annular spaced adhesive keying shoulders traversed and interrupted by a longitudinal groove extending from the bottom of the shank to and beyond the shoulders 'to open substantially at the mouth of the related hole and permitting flow of adhesive and air trapped therein when'the fastening is vinserted in `a related hole.

References Cited in the tile of this patent UNITED STATES PATENTS 1,210,595 Brubaker Jan. 2, 1917 2,690,876 Snyder .'Oct. 5, 1954 2,690,879 Snyder Oct. 5, 1954 2,707,694 Standring May 3, 1955 K FOREIGN PATENTS 133,819 vAustralia July 15, 1946 1,129,157 France Sept. 3, 1956 t V OTHER REFERENCES i Ties Are Pre-plated by Transit System, Railway Track and Structures, July 1957,- 23S-287. (Pages 44 and 45 relied on. Copy available in Scientific Library and Division 34.*) l

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