Patent Application
20120000987
The present disclosure relates generally to a rail seal for railroad crossings. More particularly, the invention relates to an elastomeric rail seal for sealing the space between a rail and the surrounding platform or road surface or road bed.
Railroad or streetcar tracks generally consist of two parallel steel rails that are anchored perpendicularly to tie members (i.e. rail ties) for maintaining a consistent distance or gauge between the two rails. Train or streetcar wheels are generally in the form of conical, flanged wheels with the smaller diameter end of the wheel being located on the outside of the rail and the larger diameter, flanged-end of the wheel being located on the inner or “gauge” side of the rail as the train or streetcar travels over the tracks. The train wheels run along the upper surface of the steel rails with the flanged inner end or larger diameter end of the wheel being guided along the inside edge of the track.
The design and structure of railroad or streetcar crossings where railroad tracks intersect with vehicular roadways or pedestrian crossings can present certain challenges with regard to the competing requirements of rail traffic versus vehicular and/or pedestrian traffic. More specifically, the structure of train wheels requires that a gap be provided along the inside edge of each track to allow the larger diameter end or the flanged-end of the wheels to engage the tracks. The engagement between the flanged-end of the wheel with the inside edge of the rail is how the train stays in contact with the tracks as it travels along the rails.
However, having gaps adjacent the rails can be problematic for vehicles and/or other pedestrian traffic (such as bicycles, wheelchairs or strollers, for example) at railroad or streetcar crossings. Firstly, the gaps create an uneven road surface, which is undesirable for vehicular traffic. As well, the gaps are particularly hazardous to pedestrians walking across the crossing as people's shoes/heels can easily be caught in the gaps causing injury. The same is true with regard to the smaller width wheels or tires that are used for bicycles, wheelchairs and strollers, for example, as the wheels can become lodged or trapped in the gap resulting in a potentially dangerous situation. Having exposed, open gaps can also present the problem of debris, etc. becoming lodged in the gap which could result in derailment of a passing train or streetcar.
Rail seals made of rubber or another elastomeric material are sometimes used in the gap between the rails and the surrounding platform area or road surface to help reduce the size of the gap adjacent the rails. However, the rail seals are often formed with a deep recess or flangeway in the upper surface thereof adjacent the rail head to provide an adequate recess or flangeway for receiving the flanged-end of the train wheel. Accordingly, these rail seals still present the problem of having a deep recess adjacent the rails which can pose a threat to pedestrians, bicycles, strollers and wheelchairs, etc. crossing the tracks.
Accordingly, there is a continuous need to improve the design and structure of public railroad or streetcar crossings to ensure that the requirements of rail traffic, vehicular traffic and pedestrian traffic are met.
The present disclosure provides an improved rail seal for sealing the gap between a rail and a surrounding platform or road surface in a railroad or streetcar crossing so as to provide a generally even or level surface for vehicular or pedestrian traffic while still providing an appropriate rail structure for receiving and guiding the flanged train wheels along the tracks.
In accordance with one example embodiment of the present disclosure there is provided a rail seal for a railroad crossing, the rail seal for sealing a gap between a rail and a surrounding road surface or platform of a railroad or streetcar crossing, the rail having a rail head, a rail base and a web portion interconnecting the rail head and rail base, the rail seal comprising: an elongated elastomeric seal body; a first surface formed along the length of the seal body for generally abutting a gauge side of the rail; a second surface formed along the length of the seal body generally opposite to said first surface, the second surface generally abutting a corresponding edge of a concrete panel of the railroad crossing; and a flangeway formed in an upper surface of the seal body along the length thereof for receiving a flanged wheel of a train; wherein the flangeway lies in a plane above the bottom of the rail head but below the upper surface of the rail head.
In accordance with another example embodiment of the present disclosure there is provided a railway crossing structure comprising: a pair of rails, each rail having a rail head, a base flange and a web portion interconnecting the rail head and the base flange; a plurality of rail ties secured transversely between the rails; a gauge panel positioned on a gauge side of the rails, the gauge panel forming a first gap between an edge of the panel and the gauge side of the corresponding rail; a pair of field panels, each field panel positioned on a field side of a corresponding rail, each field panel being spaced away from the corresponding rail to form a second gap; a gauge-side rail seal positioned within each first gap, the gauge-side rail seal comprising: an elongated elastomeric seal body; a first surface formed along the length of the seal body for generally abutting a gauge side of the rail; a second surface formed along the length of the seal body generally opposite to said first surface, the second surface generally abutting a corresponding edge of the gauge panel; and a flangeway formed in an upper surface of the seal body along the length thereof for receiving a flanged wheel of a train; wherein the flangeway lies in a plane above the bottom of the rail head but below the upper surface of the rail head.
Embodiments of the present disclosure will now be described, by way of example only, with reference to the attached Figures, wherein:
Where appropriate, like reference numerals have been used in the drawings to identify similar features.
Referring now to the drawings, there is shown in
The railway crossing structure shown in
A gauge side rail seal 30 is located in the gap 28 provided between the inside surface of the rails 12 and the gauge panel 26. The gauge side rail seal 30 is formed of an elastomeric material and has an elongated seal body 32. Typically rail seals are formed using an extrusion process, with the rail seals being formed in sections typically having lengths in the range of 5 to 16 ft. The lengths of the rails seals may vary depending on the particular design and application of the rail seal and on customer preference. The lengths of rail seal are clipped together end-to-end to form the required length.
Referring now to
The seal body 32 has a lower surface 42 formed along the length thereof which has a profile shaped to generally accommodate the rail clips 15 and rail tie fasteners (i.e. bolts or spikes) used to secure the rails 12 in place. The lower surface 42 has a rail-side or inside edge 44 adapted to contact or seal against the base flange 18 of the rail 12 and a gauge-side edge or outside edge 46 which generally rests against or seals against the rail ties or transverse members 14. The lower surface 42, which extends between the inside and outside edges 44, 46, is generally concave in shape so as to accommodate the protrusions associated with the rail clips 15 and rail tie fasteners.
The seal body 32 has an upper surface 48 extending between the gauge panel 26 and the rail head 16 of the corresponding rail 12. The upper surface 48 has a first portion 50 adjacent to the gauge panel 26 and which lies generally in the same plane or at the same surface level as the gauge panel 26 and the upper surface of the rail head 16. The first portion 50 may be generally planar or may have a textured or ribbed surface. A recessed portion or flangeway 52 for receiving the flanged-end or large diameter end of the conically-shaped train wheel is formed within the upper surface 48 of the seal body 32. The flangeway 52 runs generally parallel and adjacent to the rail head 16 along the length of the seal body 32. In standard railroad designs, the flangeway typically has a depth of at least 2 inches and is about 2.5-3 inches wide to accommodate the flanged-end of the train wheel. Accordingly, the standard flangeway generally is deeper than the overall height of the rail head 16 which, as mentioned above, is typically between 1.25-1.5 inches. A typical flange on a train wheel is usually over 1 inch deep; therefore, the standard flangeway is generally deeper than the overall depth of the wheel flange. However, as the both the rail head 16 and the train wheel wear over time, the bottom of the wheel flange will run lower, therefore the additional depth provided by the standard flangeway accommodates for this change over time. In the subject embodiment, the surface of the flangeway 52 lies generally in a plane which lies above the bottom edge 35 of the rail head 16 but below the upper surface of the rail head 16. For instance, the flangeway 52 may have a depth of approximately, but not limited to, 0.875 inches with respect to the first portion 50 of the upper surface 48 of the gauge-side rail seal 30, and may have a width of approximately, but not limited to, 2.5 inches. Therefore, the subject flangeway 52 has a smaller depth than the standard flangeway and is also not as deep as the typical flange found on train wheels. The flangeway 52, therefore, may be considered to be a “shallow” flangeway as it does not provide a deep recess that extends below the rail head 16 for receiving the entire depth of the flanged-end of the train wheel.
A main cavity passage 54 is formed within the seal body 32 along the length thereof. Cavity passage 54 is located generally below the flangeway 52 in the seal body 32 and allows the surface of the flangeway 52 to compress downwardly or deflect away from the rail head 16 under the weight of the passing train to accommodate the entire depth of the flanged-end of the train wheel as the train travels along the tracks. This ensures that the flanged-end of the train wheel adequately engages the rail 12 and rail head 16 to allow the train to be guided along the tracks without risk of derailing due to inadequate engagement between the train wheel and the rail head 16. Therefore, rail seal 30 provides a generally level and even surface across the railway crossing when the rails 12 are being crossed by vehicular and/or pedestrian traffic (including bicycles, wheelchairs, strollers, etc.) while still providing an adequate gap between the rail 12 and the surrounding platform or road surface for receiving the flanged-end of the train wheel as the train travels along the track.
Additional cavity passages 55 may be formed within the seal body 32, as is shown in the drawings. The additional cavity passages 55 are generally formed as a result of the extrusion process typically used to form rail seals of this type. However, in certain applications where additional compressibility or flexibility of the rail seal is required, additional cavity passages 55 are formed in the rail seal 30 to provide further flexibility to the flangeway 52 so as to reduce the tendency of the rail seal to pull in from the gauge side panel surface 26 when the flangeway 52 is deflected, or to modify the path of deflection of the flangeway 52. More specifically, in certain instances, additional cavity passages are provided to assure that the rail seal compresses in such a manner that the inner lip 40 of the gauge-side rail seal 30 does not get caught under the rail head 16 without being able to rebound properly to maintain a proper seal once the train has passed.
Therefore, when the gauge-side rail seal 30 is positioned within the gap between the gauge panel 26 and the corresponding rail 12, the rail seal 30 provides a generally, relatively even and continuous surface between the rails 12 and the surrounding surface thereby significantly reducing the risks and hazards for vehicular and other pedestrian traffic (i.e. bicycles, strollers, wheelchairs, etc.) that generally exist at railway or streetcar crossings while still providing an adequate gap to accommodate the flanged-end of the train wheel to ensure safe passage of the passing train or streetcar.
Rail seals having an upper surface formed generally at the same level as the upper surface of the surrounding platform or road surface and the rail head (i.e. a rail seal with no form of recess or flangeway formed in the upper surface), are known. These types of rail seals offer the advantage of providing a continuous, even surface between the rails and surrounding area (or other surface material), which significantly reduces the risk of tripping or injury as discussed above. It is for this reason that rail seals of this type are particularly advantageous in train car workshops or repair areas, etc. since there is high traffic of workmen/mechanics, etc. walking around the train cars as well as various small-wheeled tools and tool carts being pushed around the area which could easily become stuck in any sort of gap or recess adjacent the rails. However, despite their advantages in terms of preventing tripping, etc., this type of rail seal is limited to use in areas where the trains or rail cars are either stopped or only moving at very slow speeds (i.e. in repair areas). The rail seals with a continuous, even upper surface are generally limited to this particular use since having no visible or physical flangeway in the rail seal for allowing the train wheel to engage the rail head and be guided along the track increases the risk of possible derailment of the train, especially at high speeds. A flangeway not only helps to ensure proper engagement of the train wheel but it also provides a visual guide for the driver of the train (or streetcar). Therefore, while rail seals having a continuous, even upper surface (i.e. with no recess or flangeway) provide the advantage of preventing tripping, etc. since no gap or recess exists between the rail and the surrounding area, this type of rail seal is generally unacceptable for use in railroad or streetcar crossings in public areas where trains are generally travelling at higher speeds. Accordingly, these “continuous” rail seals do not address the problems associated with the structure of public railroad or streetcar crossings where the crossing is used by vehicular and/or pedestrian traffic.
Referring now to
Referring now to
The seal body 62 of the field-side rail seal 60 has a lower surface 70 formed along the length thereof which is shaped to generally accommodate and/or surround the rail clips 15 and rail tie fasteners that are used to secure the rails 12 in place. Accordingly, as shown in the drawings, the lower surface 70 has a generally concave shape to accommodate the protruding portions of the rail clips 15 and rail tie fasteners. The seal body 62 has an upper surface 72 extending between the concrete field panel 24 and the rail head 16 of the corresponding rail 12 which lies generally in the same plane or at the same surface level as the concrete field panel 24 and the upper surface of the rail head 16. The upper surface 72 of the field-side rail seal 60 provides a generally continuous surface between the concrete surround and the rails 12 in the railway crossing. Various cavity passages 74 may be formed within the seal body 62 along the length thereof; however, these passages 74 are typically formed as part of the extrusion process to form the rail seal 60.
Referring now to
As shown in
Seal body 132 has a lower surface 142 extending between the second end 192 of the first surface 134 and the lower end of the second surface 136. The lower surface 142 is generally shaped so as to accommodate the protruding components of the rail clips 15 and/or rail tie fasteners used to secure the transverse members 14 (or rail ties) in place.
The seal body 132 has an upper surface 148 which extends between the concrete gauge panel 126 and the rail head 16 of the corresponding rail 12. As in the above-described embodiments, the upper surface 148 has a first portion 150 which lies generally in the same plane or at the same surface level as the concrete gauge panel 126 and the upper surface of the rail head 16, and a flangeway or recessed portion 152 which runs adjacent and parallel to the rail 12 along the length of the rail seal 132. The flangeway or recessed portion 152 is adapted to receive the flanged-end or large diameter end of the train wheel and lies generally in a place which lies above the bottom edge 35 of the rail head 16 but below the upper surface of the rail head 16 as described above in connection with
A main cavity passage 154 is formed within the seal body 132 along the length thereof. As previously described, the cavity passage 154, which is generally aligned with and located below the flangeway 152, allows the flangeway 152 to compress downwardly or deflect away from the rail head 16 under the weight of the passing train. This allows the flangeway 152 to deform sufficiently so that the flanged-end of the train wheel can fully engage the rail 12, as described in further detail above. It will be understood that cavity passage 154 may also be filled with a compressible material 156 as described above in connection with the specific embodiment shown in
In this embodiment, the field-side rail seal 160 is also formed so that it can be attached to the concrete field panel 124 and mounted in the railroad or streetcar crossing as a singular unit. Accordingly, the field-side rail seal 160 has a first surface 164 formed along the length of the seal body 162 for generally abutting and sealing against at least a portion of the rail 12, the first surface 164 having an inner lip 168 for engaging the underside or bottom outside edge 65 of the rail head 16. This helps to ensure that the field-side rail seal 160 adequately engages and seals with the corresponding rail 12. The second surface 166 is adapted to be bolted or cast directly into the corresponding edge of the concrete field panel 124, as is known in the art. In the subject embodiment, the field-side rail seal 160 does not extend the full depth of the gap provided between the rail 12 and the concrete field panel 24 and, therefore, does not contact the rail base 18 or any of the rail clips 15 or transverse members 14.
The field-side rail seal 160 has a lower surface 170 which, in the subject embodiment, is a generally planar surface. As in the previously described embodiment, the upper surface 172 of the rail seal 160 extends between the concrete field panel 24 and the rail head 16 of the corresponding rail 12 and lies generally in the same plane or at the same level as the field panel 24 and the upper surface of the rail head 16. Therefore the field-side rail seal 160 provides a generally even, continuous surface between the rail 12 and the corresponding concrete panel 124 as is typical of field-side rail seals. While the field-side rail seal 160 is shown with various cavity passages 174 formed therein, these passages are generally formed as a result of the extrusion process used to form rail seals of this type.
Referring now to
Accordingly, it will be understood that the rail seal according to the present disclosure can be used in various types of rail crossings. More specifically, the rail seals can be incorporated into rail crossings that form part of a poured asphalt road surface, or into rail crossings having concrete panel surrounds or other road surface material.
Furthermore, the various embodiments presented above are merely examples and are in no way meant to limit the scope of this disclosure. Variations of the innovations described herein will be apparent to persons of ordinary skill in the art, such variations being within the intended scope of the present application. The subject matter described herein and in the recited claims intends to cover and embrace all suitable changes in technology.
