Patent US3894686A successfully refreshed from Google Patents.
US3894686A
Expired / Lapsed
US
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Railroad crossing construction
Assignee: Fel Pro Inc
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Filing: 1974-05-17
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Granted: 1975-07-15
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Expires: 1994-05-17
Abstract
Abstract Railroad crossing structure for a paved roadway over at least a pair of spaced rails mounted on cross ties to form a railroad track and supported by a ballast comprises a flexible center pad which extends transversely between each pair of spaced rails and flexible side pads which extend transversely between each segment of paved roadway and the rail nearest thereto. The flexible center and side pads are bonded directly to the ballast and comprise a resilient base layer containing a cured flexible thermoset resin and a filler of comminuted scrap rubber, and a resilient wear layer on top of the base layer and containing a cured flexible thermoset resin and a filler of finely divided rubber.
Inventors
- 👤 Lewis C Weinberg
- 👤 John L Cabanski
- 👤 Jr John C Moerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:56
CPC Classifications
E; E01; E01C; E01C9/00; E01C9/04; E01C7/00; E01C7/08; E01C7/30
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
213 words
A RAILROAD CROSSING STRUCTURE FOR A PAVED ROADWAY ACROSS AT LEAST A PAIR OF SPACED RAILS FOR GUIDING RAILROAD VEHICLES AND MOUNTED ON CROSS TIE MEANS SUPPORTED ON BALLAST WHICH COMPRISES A FLEXIBLE CENTER PAD MEANS EXTENDING TRANSVERSELY BETWEEN EACH PAIR OF SPACED RAILS, PROVIDING A ROADWAY SURFACE THEREBETWEEN, AND BEING BONDED DIRECTLY TO SAID BALLAST AND BEING IN A SEALING ENGAGEMENT WITH SAID RAILS, AND A FLEXIBLE SIDE PAD MEANS EXTENDING TRANSVERSELY BETWEEN EACH PAVEMENT SEGMENT AND THE RAIL NEAREST THERETO, PROVIDING A ROADWAY SURFACE THEREBETWEEN, AND BEING BONDED DIRECTLY TO SAID BALLAST AND BEING IN A SEALING ENGAGEMENT WITH SAID NEAREST RAIL, EACH OF SAID FLEXIBLE PAD MEANS HAVING A BASE LAYER COMPRISING A FLEXIBLE THERMOSET RESIN WHICH IS A CURED GLYCIDYL ETHER RESIN, COMMINUTED SCRAP RUBBER, AND AN INORGANIC BULK FILLER, AND A WEAR LAYER OF A CURED FLEXI LE THERMOSET RESIN AND FINELY-DIVIDED SCRAP RUBBER ON TOP OF SAID BASE LAYER, SCRAP RUBBER-TO-CURED RESIN VOLUME RATIO IN SAID BASE LAYER BEING ABOUT 2:1 TO ABOUT 6:1 AND SCRAP RUBBERTO-CURED RESIN VOLUME RATIO IN SAID WEAR LAYER BEING ABOUT 1:1 TO ABOUT 4:1, AND SAID CURED GLYCIDYL ETHER RESIN IN SAID BASE LAYER BONDING TOGETHER INDIVIDUAL BALLAST PARTICLES BELOW SAID BASE LAYER AND BONDING SAID BASE LAYER TO SAID BALLAST.
Claim 2
Dependent Claim
213 words
A RAILROAD CROSSING STRUCTURE FOR A PAVED ROADWAY ACROSS AT LEAST A PAIR OF SPACED RAILS FOR GUIDING RAILROAD VEHICLES AND MOUNTED ON CROSS TIE MEANS SUPPORTED ON BALLAST WHICH COMPRISES A FLEXIBLE CENTER PAD MEANS EXTENDING TRANSVERSELY BETWEEN EACH PAIR OF SPACED RAILS, PROVIDING A ROADWAY SURFACE THEREBETWEEN, AND BEING BONDED DIRECTLY TO SAID BALLAST AND BEING IN A SEALING ENGAGEMENT WITH SAID RAILS, AND A FLEXIBLE SIDE PAD MEANS EXTENDING TRANSVERSELY BETWEEN EACH PAVEMENT SEGMENT AND THE RAIL NEAREST THERETO, PROVIDING A ROADWAY SURFACE THEREBETWEEN, AND BEING BONDED DIRECTLY TO SAID BALLAST AND BEING IN A SEALING ENGAGEMENT WITH SAID NEAREST RAIL, EACH OF SAID FLEXIBLE PAD MEANS HAVING A BASE LAYER COMPRISING A FLEXIBLE THERMOSET RESIN WHICH IS A CURED GLYCIDYL ETHER RESIN, COMMINUTED SCRAP RUBBER, AND AN INORGANIC BULK FILLER, AND A WEAR LAYER OF A CURED FLEXI LE THERMOSET RESIN AND FINELY-DIVIDED SCRAP RUBBER ON TOP OF SAID BASE LAYER, SCRAP RUBBER-TO-CURED RESIN VOLUME RATIO IN SAID BASE LAYER BEING ABOUT 2:1 TO ABOUT 6:1 AND SCRAP RUBBERTO-CURED RESIN VOLUME RATIO IN SAID WEAR LAYER BEING ABOUT 1:1 TO ABOUT 4:1, AND SAID CURED GLYCIDYL ETHER RESIN IN SAID BASE LAYER BONDING TOGETHER INDIVIDUAL BALLAST PARTICLES BELOW SAID BASE LAYER AND BONDING SAID BASE LAYER TO SAID BALLAST.
Claim 3
Dependent Claim
33 words
The railroad crossing structure in accordance with claim 1 wherein said flexible pad means further include an elastic bridge network of said cured glycidyl ether resin holding together individual particles of said ballast.
Claim 4
Dependent Claim
19 words
The railroad crossing structure in accordance with claim 1 wherein said inorganic bulk filler is a plurality of blocks.
Claim 5
Dependent Claim
206 words
A railroad crossing structure for a paved roadway across at least a pair of spaced rails for guiding railroad vehicles and mounted on cross tie means supported on ballast which comprises a flexible center pad means extending transversely between each pair of spaced rails, providing a roadway surface therebetween, and being bonded directly to said ballast and being in a sealing engagement with said rails; and a flexible side pad means extending transversely between each pavement segment and the rail nearest thereto, providing a roadway surface therebetween, and being bonded directly to said ballast and being in a sealing engagement with said nearest rail; each of said flexible pad means comprising a base layer of a cured flexible thermoset resin which is a condensation product of a glycidyl ether resin and a thiol-terminated polysulfide resin and a filler which is comminuted scrap rubber, and a wear layer of a cured flexible thermoset resin which is an aliphatic amine-cured glycidyl ether resin and a filler which is finely-divided scrap rubber on top of said base layer, a filler-to-cured resin volume ratio in said base layer being about 2:1 to about 6:1, and the filler-to-cured resin volume ratio in said wear layer being about 1:1 to about 4:1.
Claim 6
Dependent Claim
206 words
A railroad crossing structure for a paved roadway across at least a pair of spaced rails for guiding railroad vehicles and mounted on cross tie means supported on ballast which comprises a flexible center pad means extending transversely between each pair of spaced rails, providing a roadway surface therebetween, and being bonded directly to said ballast and being in a sealing engagement with said rails; and a flexible side pad means extending transversely between each pavement segment and the rail nearest thereto, providing a roadway surface therebetween, and being bonded directly to said ballast and being in a sealing engagement with said nearest rail; each of said flexible pad means comprising a base layer of a cured flexible thermoset resin which is a condensation product of a glycidyl ether resin and a thiol-terminated polysulfide resin and a filler which is comminuted scrap rubber, and a wear layer of a cured flexible thermoset resin which is an aliphatic amine-cured glycidyl ether resin and a filler which is finely-divided scrap rubber on top of said base layer, a filler-to-cured resin volume ratio in said base layer being about 2:1 to about 6:1, and the filler-to-cured resin volume ratio in said wear layer being about 1:1 to about 4:1.
Claim 7
Dependent Claim
132 words
The railroad crossing structure in accordance with claim 4 wherein said flexible thermoset resin in the base layer is a condensation product of diglycidyl ether of bisphenol A and ethyl formal disulfide polymer in a weight ratio of about 5:1 to about 1:2, respectively, the ethyl formal disulfide polymer having the general formula H ( SCH2CH2OCH2OCH2CH2S )nH where n is of sufficient magnitude to give a molecular weight of about 400 to about 1200, and about 0.7 to about 0.4 parts by weight 2,4,6-tri(dimethylaminomethyl) phenol; and wherein said flexible thermoset resin in the wear layer comprises a diglycidyl ether of bisphenol A and a flexibilizing polyepoxide in a weight ratio of about 2:1 to about 1:4, respectively, and about 0.5 to about 0.9 parts by weight of an aliphatic polyamine curing agent.
Claim 8
Independent Claim
200 words
A method for manufacturing a resilient railroad crossing pad to provide a crossing structure across at least a pair of spaced rails mounted on cross tie means supported on ballast which comprises the steps of preparing a curable base layer composition comprising a glycidyl ether resin and a thiol-terminating polysulfide resin, a dialkylaminoalkyl phenol curing agent, and a particulate resilient filler; said filler and said resin being present in said curable base layer composition in a volume ratio of about 4:1 to about 6:1, respectively; casting said curable base layer composition over said ballast to form a base layer for said pad in situ; curing the cast base layer so as to form a condensation product of said glycidyl ether and said polysulfide; preparing a curable wear layer composition comprising a glycidyl ether resin, a polyepoxide resin, an aliphatic amine cross-linking agent, and a particulate resilient filler; said filler and said resin being present in said second curable composition in a volume ratio of about 3:1, respectively; casting said curable wear layer composition to form a wear layer on top of said base layer; and curing the cast wear layer so as to form an aliphatic amine-cured glycidyl ether polymer.
Claim 9
Independent Claim
200 words
A method for manufacturing a resilient railroad crossing pad to provide a crossing structure across at least a pair of spaced rails mounted on cross tie means supported on ballast which comprises the steps of preparing a curable base layer composition comprising a glycidyl ether resin and a thiol-terminating polysulfide resin, a dialkylaminoalkyl phenol curing agent, and a particulate resilient filler; said filler and said resin being present in said curable base layer composition in a volume ratio of about 4:1 to about 6:1, respectively; casting said curable base layer composition over said ballast to form a base layer for said pad in situ; curing the cast base layer so as to form a condensation product of said glycidyl ether and said polysulfide; preparing a curable wear layer composition comprising a glycidyl ether resin, a polyepoxide resin, an aliphatic amine cross-linking agent, and a particulate resilient filler; said filler and said resin being present in said second curable composition in a volume ratio of about 3:1, respectively; casting said curable wear layer composition to form a wear layer on top of said base layer; and curing the cast wear layer so as to form an aliphatic amine-cured glycidyl ether polymer.
Claim 10
Dependent Claim
104 words
The method in accordance with claim 6 wherein the curable liquid resin for the base layer composition is a mixture of glycidyl etHer resin and thiol-terminated polysulfide in a weight ratio of about 5:1 to about 1:2, respectively, and about 0.7 to about 0.4 parts by weight dialkylaminoalkyl phenol, and wherein the curable liquid resin for the wear layer composition is a mixture of glycidyl ether resin and a flexibilizing polyepoxide in a weight ratio of about 2:1 to about 1:4, respectively, and wherein about 0.5 parts to about 0.9 parts by weight of an aliphatic amine curing agent are present in the mixture.
Claim 11
Dependent Claim
105 words
The method in accordance with claim 6 wherein the curable liquid resin for the base layer composition contains about 5 parts by weight diglycidyl ether of bisphenol A, about 2 parts by weight ethyl formal disulfide polymer of the general formula H ( SCH2CH2OCH2OCH2CH2S )nH where n is of sufficient magnitude to give a molecular weight of about 1000, about 0.5 parts by weight 2,4,6-tri(dimethylaminomethyl) phenol; and wherein the curable liquid resin for the wear layer composition contains about 1.65 parts by weight diglycidyl ether of bisphenol A, about 2.15 parts by weight of a flexibilizing polyepoxide, and about 0.8 parts by weight aliphatic polyamine.
Claim 12
Dependent Claim
37 words
The method in accordance with claim 6 wherein that portion of the ballast which is covered by said crossing pad is pre-wetted with a curable liquid resin composition before said curable base layer composition is cast thereover.
Claim 13
Independent Claim
199 words
A method of repairing an existing paved roadway crossing over a railroad track which includes a pair of spaced rails supported on ties supported by a ballast material and wherein roadway pavement extends up to and transversely between the rails, which comprises cleaning out existing pavement and a portion of said ballast down to at least tie level in the region between said rails and also in a region immediately adjacent to each pair of spaced rails; casting a base layer comprising a curable liquid resin composition and a filler of comminuted scrap rubber in said cleaned out regions to a level above the tie level but below the pavement level; curing the cast base layer so as to produce a flexible base; casting a wear layer comprising a curable liquid resin mixture and a filler of finely-divided scrap rubber substantially level with said rails and said pavement; and curing the cast wear layer so as to produce a flexible wear layer over said flexible base; the filler-to-curable resin volume ratio in the base layer being about 2:1 to about 6:1, respectively, and the filler-to-curable resin volume ratio in the wear layer being about 1:1 to about 4:1, respectively.
Claim 14
Independent Claim
199 words
A method of repairing an existing paved roadway crossing over a railroad track which includes a pair of spaced rails supported on ties supported by a ballast material and wherein roadway pavement extends up to and transversely between the rails, which comprises cleaning out existing pavement and a portion of said ballast down to at least tie level in the region between said rails and also in a region immediately adjacent to each pair of spaced rails; casting a base layer comprising a curable liquid resin composition and a filler of comminuted scrap rubber in said cleaned out regions to a level above the tie level but below the pavement level; curing the cast base layer so as to produce a flexible base; casting a wear layer comprising a curable liquid resin mixture and a filler of finely-divided scrap rubber substantially level with said rails and said pavement; and curing the cast wear layer so as to produce a flexible wear layer over said flexible base; the filler-to-curable resin volume ratio in the base layer being about 2:1 to about 6:1, respectively, and the filler-to-curable resin volume ratio in the wear layer being about 1:1 to about 4:1, respectively.
Claim 15
Dependent Claim
36 words
The method in accordance with claim 10 wherein the filler-to-curable resin volume ratio in the base layer is about 4:1 to about 6:1 and the filler-to-curable resin volume ratio in the wear layer is about 3:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |