Abstract:
The present invention contemplates a resilient pad mounted on the outside adjacent portion of a rail having sealing engagement with the rail along its base, the head and the interconnecting web of the rail with compression chambers located within the pad to permit the resiliency of the pad to cooperate with the movement of the rail in its vertical displacement as well as other movements imparted thereto by the passage of trains, thereover while maintaining a sealing contact with the rail to prevent water collecting along the rail and other foreign matter to minimize maintenance.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to a railroad crossing structure and more particularly to a new and improved railroad crossing structure employing resilient units adjacent to the railroad track. 
     Considerable effort has been made to improve railroad crossing structures to reduce the maintenance and upkeep required thereon. One of the principal problems of railroad crossing is that their structure tend to deteriorate in a relatively short time requiring considerable expenditure of time and money to repair such structure. Of particular concern is that during the winter months, the repairs made can only be temporary which are often unsatisfactory. An additional problem is that water or moisture accumulate in and around the rails and ties and through the repeated process of freezing and thawing breaks up the pavement. Some installations have approached the problem by employing extensive flexible plates that substantially cover the entire area between adjacent tracks. These are costly installations. The present invention employs longitudinal resilient pads or strips that effectively seal the adjacent areas of the railroad tracks from water and other foreign matters while permitting the use of conventional material between such adjacent rails thereby minimizing cost. In addition the resilient pad effectively seals the rail to prevent the damage caused by refreezing of water since it effectively seals out such water. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a railroad crossing structure that has a resilient longitudinally extending pad located along the outside portion of the rail in sealing engagement therewith. The resilient pad has a bottom surface that is contoured to the surface of the base of the rail and in engagement therewith, a side surface that abuttingly and sealing engages the web of the rail, and an upper corrugated surface that is substantially flush with the top of the rail. The pad has compression chambers that provide for the resiliency thereof. Selectively a similarly resilient pad or rigid I-shaped beam structure is mounted adjacent to the rail on the side opposite the first pad to accommodate the flange of the railroad car&#39;s wheel while sealing the rail. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a cross-sectional view of a railroad track showing a resilient seal and a portion of a railroad tie with an outside sealing member. 
     FIG. 2 is a cross-sectional view of a rail and seal unit of a modified form of the invention. 
     FIG. 3 is a cross-sectional view of a rail and a further modified form of a seal unit. 
    
    
     DETAILED DESCRIPTION 
     Referring to the drawings wherein like reference numerals designate like or corresponding parts throughout the several views, there is shown in FIG. 1 a rail 1 having head 2, an intermediate web portion 3 and a base 4 suitably resting on a plate 5 and secured by rail spikes 7 into railroad cross ties 8. Other rail supporting means may be employed. 
     In viewing FIG. 1, the area to the left thereof is referred to as the inside since it depicts that the parallel rail for rail 1 is to the left thereof and that the area to the right thereof is the outside area. 
     Mounted to the outside of the rail is a longitudinally extending block of a resilient pad, or slab of material 10 made from an elastomer such as natural rubber, or a synthetic material which is resistant to corrosion as well as abrasion, as for example butyl rubber, EPDM rubber, and the like. Pad or slab 10 has a plurality of bores 12 extending longitudinally therethrough. Such bores acts as compression chambers accommodating the changing shape effected on the resilient slab from outside forces. The upper running surface of the slab 10 has a corrugated surface 14 substantially on the same planar surface as the top of the rail 1. The lower surface of slab 10 has an inclined surface 16 that snugly fits the countour of the base 4 of rail 1, however extending laterally downward beyond the base to provide a firm contact with the plate 5. Such contour of the lower surface of slab 10 is complimentary to that of the bottom portion of the rail which contour can vary, be it horizontal or inclined. The one side surface 17 of the flexible slab 10 is a generally convex shape paralleling that of the contour of the rail such as to merge with the bottom portion of the slab that follows the contour of the base 4 as seen in FIG. 1. The uppermost portion of such one side surface 17 is generally planar and in abutting contact with the head 2 of the rail 1. The portion of side surface 17 between the planar surface and the convex side portion is recessed as at 18. This construction of the slab 10 provides a compression chamber in recess 18 in cooperation with the head 2 and web 3. The side 20 of slab 10 opposite that of side 17 has an upper planar surface adjacent the top surface 14 and a lower planar surface adjacent the bottom surface of the slab. Side 20 intermediate the upper and lower planar surfaces of slab 10 is arcuate shaped to provide a recess within which asphalt or other fill material which is used holds the slab 10 in position against the rail. The slab 10 adjacent to rail 1 is relatively narrow and an asphalt or other road surface construction material is formed snugly against the outside surface of side 20 thereof so as to form an unbroken surface between the resilient slab 10 and the road surface of the crossing that has substantial depth and holds the slab 10 in a fixed position relative to rail 1. 
     Mounted on the opposite side of slab 10 is a horizontally disposed rail 30 having a head 31, flanged base 32 and an interconnecting web 33. Asphalt 35, paving material or some other fiber material or fill material is compacted between the rails 1 and the flanged bases 32 on each side of the rails 1. Gravel 36 may be compacted below the web 33 to provide drainage. The head 31 of the rail 30 abuttingly contacts the web 3 of rail 1 and is closely adjacent the head 2 of rail 1 to provide a clearance space for the movement of the flange of the railroad wheels. The flanged base 32 has its uppermost edge substantially parallel with the top surface of rail 1 such that the compacted fill material between the rails 1 is held at the same level as the rails to facilitate the safe movement of traffic transverse to the rails at such railroad crossings. The interconnecting web 33 is substantially horizontal. The horizontally disposed rail 30 is shown of smaller dimension than the rail 1 although other sizes are contemplated. Further, in lieu of a rail 30 other configuration may be used, such as an I-beam with legs corresponding to the length of rail 30 to permit the unobstructed rolling of the railroad wheel&#39;s flange. 
     A modification of the above described invention is shown in FIGS. 2 and 3 wherein the rail 1 and resilient slab 10 are identical to that described in FIG. 1. However in lieu of the rigid rail 30 a resilient longitudinally extending pad 40 or 50 is substituted as per FIGS. 2 and 3 respectively. 
     Resilient pad 40 is contoured similarly to that of pad 10 having a plurality of longitudinally extending bores, an arcuately shaped bottom surface 41, a slightly arcuately contoured side surface 42 except that its upper portion is generally U-shaped, having upwardly extending leg portions 43 and 44. Leg portion 44 terminates into abutting frictional contact with the underneath portion of head 2 of rail 1 while leg portion 43 extends upwardly to a position that is on the same horizontal plane as the top surface of rail 1 thus providing a recess on the inside surface of rail 1 to accommodate the unobstructed movement of the flanged wheel of a railroad car. 
     Resilient pad 50 is contoured similarly to that of pad 10 having a plurality of longitudinally extending bores 56, an arcuately shaped bottom surface 51, an arcuately contoured side surface 52, a recess 53 on other side surface, a top corrugated surface 54, however, having a relative large triangular shaped longitudinally extending bore 55 compared to bores 56 or 12. Other configurations of bore 55 are contemplated, however, it being advantageous to have such bore of a large size to permit deflection to accommodate the flange of a rail wheel. Bore 55 is located along the upper portion of pad 50 to provide sufficient resiliency to accommodate the unobstructed movement of the flanged wheel of a railroad car which will deflect downwardly that portion of pad 50 that is adjacent to the head 2 of rail 1. The other difference in pad 50 to pad 10 is that pad 50 (as well as pad 40) is of greater width to provide stability to the pad in its functioning to seal the area adjacent to the rail yet provide a smooth passage for vehicles across while reducing the cost of maintaining the crossing structure over a prolonged period under adverse weather and traffic conditions. 
     It will be apparent that, although a specific embodiment and certain modifications of the invention have been described in detail, the invention is not limited to the specifically illustrated and described inventions since variations may be made without departing from the principles of the invention.