PREAMBLE TO THE DESCRIPTION:

The following specification particularly describes the invention and the manner in which it is to be performed:
FIELD OF THE INVENTION
This invention relates to an improved railway anti creep grooved rubber sole plate. More particularly, the invention provides an element to suitably grip between the rail and Pre Stressed Concrete (PSC) Sleeper and to attenuate vibrations and absorbing dynamic loads transmitted by vehicles to rails.

BACKGROUND OF THE INVENTION
Rail transport which is managed by central government is one of the most important modes of transport in India. Indian railway system is a public utility transport and has grown to be the fourth largest in the World and largest in the Asia. The total railway network covers 115000 Km of track over a route of 65000 Km with 7500 railway stations.
Because of importance of railway transport in India, large funds are invested every year to maintain and upgrade the railway system. The most important part of any railway system is railway track, hence the need for the maintenance of railway track cannot be overlooked. Safety and quality standard are set in every railway system for track maintenance, which includes inspection, track data collection and possible renewals.
In general, a railway track system consists of rail steel, concrete sleepers and the track fasteners. Rubber pad or Grooved Rubber Sole Plate (GRSP) is placed between the rail steel and the sleeper to provide insulation, absorb vibrations and also increase the coefficient of friction between the rail and the sleeper.
There are various attempts have been taken in GRSP to dampen vibrations, protect the ties from dynamic impact loading, and to reduce rail wear and rolling stock maintenance costs. The conventional GRSP are formed of a flexible elastomeric material such as natural rubber. Such material however does not have sufficient resistance against wear and rips caused by compression and repeated tangential forces exerted by passing rail wheels.
Furthermore, such known GRSP conventionally has employed a substantially rectangular or trapezoidal shape. As a result, pressure from a passing train and rail concentrates substantially at the center of the elastic pad. This concentrated load exerts maximum pressure on the underlying tie resulted premature failure of GRSP. Despite of many changes in the specification of GRSP, it deteriorates at faster speed than expected and need to be replaced premature.
The present invention eliminates the problems and disadvantages of pre existing GRSP which is suitable for modern railway track requirement and quality standard. It provides better field properties like resilience, higher creep resistance and electrical resistance and solves the problem of premature failure of GRSP.

OBJECT OF THE INVENTION
The main object of the present invention is to eliminate the above-discussed disadvantages inherent to the conventional GRSP.
Yet another object of this invention is to provide an improved GRSP having the properties of high resistance to wear and tangential shear forces.
Yet another object of the present invention is to provide such rail pad having unique configuration resulting in an improved distribution of forces.
Yet another object of this invention is to provide an improved GRSP, where a suitable number of semispherical or similar cavities designed into the rail pad, so as to augment the creation of vacuum between the two contact surfaces.
Yet another object of this invention is to create the vacuum to attenuate vibrations and absorbing dynamic loads transmitted by vehicles to rails.
Yet another object of this invention is to provide a GRSP that is capable of withstanding higher vibrations, cyclic, torsion and tangential shear forces.
Yet another object of this invention is to provide a unique conforming surface to protect sleeper top against wear and impact.
Yet another object of this invention is to provide better resilience for rail vibration and higher creep resistance.
Yet another object of this invention is to provide a GRSP with bent edges so as to suitably grip the PSC Sleeper and prevent the slipping of the GRSP from rail and PSC Sleeper during the train movement.
Yet another object of this invention is to provide a simple alternative form GRSP which is cheaper to produce and is still as effective functionally as previous pads.
Still another object of the invention is to provide a GRSP which is able to resist railway forces with high durability.

SUMMARY OF THE INVENTION
This invention relates to an improved railway anti creep grooved rubber sole plate. More particularly, the invention provides an element to suitably grip between the rail and PSC Sleeper and to attenuate vibrations and absorbing dynamic loads transmitted by vehicles to rails.
In one aspect, the present invention provides an anti creep grooved rubber sole plate (GRSP) made from a suitable metallic or polymer lining, sandwiched between two or more layers, similar or different materials, so as to impart additional tensile strength to the device. The invention further provides a GRSP having two opposite sides, characterized in that at least one of its opposite sides is a surface with at least a suitable number of semispherical or similar cavities made and arranged alternately one into another so as to augment the creation of vacuum between the two contact surfaces i.e. the GRSP and the Rail bottom and the GRSP and the top of Pre Stressed Concrete (PSC) Sleeper.

In another aspect, the present invention is providing a GRSP installed by treating both the surfaces i.e. top and bottom surfaces with strong sticker adhesive, and then covering these surfaces with a release paper. This release paper on both sides is removed immediately before putting the GRSP’s into service onto railway track. The strong adhesion properties of the agent provide a strong bonding between the three surfaces i.e. PSC Sleeper, GRSP and Rail. This in turn restricts any unwanted movement of Rail against the PSC Sleepers.
The invention ensures to get very effective anti creep GRSP. During passage of a rail vehicle the GRSP according to the invention creates vacuum between the two contact surfaces that is why it well attenuates vibrations and absorbs impacts emerging during rolling of rail vehicle wheels on a fragment of the rail lying directly on this pad. The GRSP, according to the invention, does not shift relative to the lower surface of a rail foot and/or the upper surface of a sleeper. Hence it does not slip out of the gap between a rail foot and a sleeper .This prevents abrasive wear of the sleeper and also protects the elastic pad from wear and tear, according to the present invention.
These and other objects, features, aspects and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the drawings, discloses preferred embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS
The invention may be more completely understood in consideration of the following detailed description of various embodiments of the invention in connection with the accompanying drawings.
Fig.1 is a schematic top plan view of a GRSP in accordance with the present invention.
Fig.2 is a schematic open view of a GRSP surfaces in accordance with the present invention.
Fig.3 is a schematic perspective view of a GRSP in accordance with the present invention.
Fig. 4 is a schematic sectioned side elevation of the GRSP of Figure 3.
Fig. 5 is a schematic sandwiched view of GRSP showing two or more surface layers.
Fig. 6 is a suitable metallic or polymer lining sandwiched between two or more layers of rubber or polymer.
Fig. 7 is a schematic sectioned side elevation of the GRSP of Figure 6.
Fig. 8 is a schematic perspective view of sleeper attached with GRSP.
Fig. 9 is a schematic position of GRSP with respect to the sleeper.

DETAILED DESCRIPTION OF THE INVENTION

It should be understood that the embodiments described above are merely exemplary and that modifications may be made thereto without departing from the scope of the present invention. For example, the GRSP of the present invention is shown in accordance with the current standard of railway system. However, the GRSP may be modified in any desired shape and configuration. Additionally, one or more of the GRSP described above may alternatively include a different structure, or any other structure.

As depicted in Fig.1, and Fig.2, a GRSP 1 in accordance with the present invention is shown. The vacuum grooves 2 are shown on the surface of GRSP.
Fig.3 is another schematic perspective view of a GRSP 1 in accordance with the present invention showing vacuum grooves 2 and lateral grooves 3 to release air or any extraneous matter.
Fig. 4 depicts a schematic sectioned side elevation of the GRSP of Figure 3.
Referring to Fig. 5a and 5b, a schematic sandwiched view of GRSP 1 showing two or more surface layers 101, 102 is shown, wherein the layers can be of different materials to provide tensile strength to the device.
Referring to Fig. 6, a suitable metallic or polymer lining 101 sandwiched between two or more layers 102 of rubber or polymer is shown.
Referring to Fig. 7, a schematic sectioned side elevation of the GRSP 1 with layer 101 sandwiched between layers 102 is shown.
Referring to Fig. 8, a schematic perspective view of sleeper 4 attached with GRSP 1 is shown.
Fig. 9 is a schematic position of GRSP 1 with respect to the sleeper.

Accordingly, the preferred embodiment of the present invention provides an anti creep grooved rubber sole plate (GRSP) made from a suitable metallic or polymer lining, sandwiched between two or more layers, similar or different materials, so as to impart additional tensile strength to the device. The invention further provides a GRSP having two opposite sides, characterized in that at least one of its opposite sides is a surface with at least a suitable number of semispherical or similar cavities made and arranged alternately one into another so as to augment the creation of vacuum between the two contact surfaces i.e. the GRSP and the Rail bottom and the GRSP and the top of Pre Stressed Concrete (PSC) Sleeper.

In another preferred embodiment, the present invention is providing a GRSP installed by treating both the surfaces i.e. top and bottom surfaces with strong sticker adhesive, and then covering these surfaces with a release paper. This release paper on both sides is removed immediately before putting the GRSP’s into service onto railway track. The strong adhesion properties of the agent provide a strong bonding between the three surfaces i.e. PSC Sleeper, GRSP and Rail. This in turn restricts any unwanted movement of Rail against the PSC Sleepers.
According to another preferred embodiment of the present invention, the Grooved Rubber Sole Plate is made of one or more materials like suitable metallic or polymer lining, sandwiched between two or more layers of same, similar or different materials, so as to impart additional tensile strength to the device. There are provided a suitable number of semispherical or similar cavities or grooves designed into the device, so as to augment the creation of vacuum between the two surfaces i.e. the GRSP and the Rail bottom and the GRSP and the top of Pre Stressed Concrete Sleeper. Both the surfaces i.e. top and bottom surfaces are treated with strong sticker adhesive and then covering these surfaces with a release paper. The release paper on both sides is removed just before putting the GRSP’s into service onto railway track. The strong adhesion properties of the agent provide a strong bonding between the three surfaces i.e. PSC Sleeper, GRSP and Rail. This in turn restricts any unwanted movement of Rail against the PSC Sleepers. The GRSP has bent edges so as to suitably grip the PSC Sleeper and prevent the slipping of the GRSP from between the rail and PSC Sleeper, during the train movement.
The invention ensures to get very effective anti creep GRSP. During passage of a rail vehicle the GRSP according to the invention creates vacuum between the two contact surfaces that is why it well attenuates vibrations and absorbs impacts emerging during rolling of rail vehicle wheels on a fragment of the rail lying directly on this pad. The GRSP, according to the invention, does not shift relative to the lower surface of a rail foot and/or the upper surface of a sleeper. Hence it does not slip out of the gap between a rail foot and a sleeper .This prevents abrasive wear of the sleeper and also protects the elastic pad from wear and tear, according to the present invention.
It is to be understood that the present invention is not to be limited to just the preferred embodiment disclosed, but that the invention described herein is capable of numerous rearrangements, modifications and substitutions without departing from the scope of the claims hereafter.

Dated this 20th day of May, 2015

LALIT AMBASTHA
of Patentwire Consultants Pvt. Ltd.
Agent for the Applicant
[IN/PA 1319]

CLAIMS

We claim:

1. An anti creep Grooved Rubber Sole Plate (GRSP) comprising:
a. at least one metallic layer sandwiched between two or more non metallic layers;
b. two opposite surfaces wherein one surface is in contact with rail bottom and the other is in contact with top of sleeper and wherein at least one of its opposite sides is a surface with at least a suitable number of semispherical or similar cavities made and arranged alternately one into another; and
c. a layer of sticker adhesive on the surfaces covered by a release paper;

wherein,
the non metallic layers consist of either rubber or polymeric lining;
the semispherical or similar cavities made and arranged alternately one into another to create vacuum between the two contact surfaces i.e. the GRSP and the rail bottom and the GRSP and the top of sleeper;
the layer of sticker is exposed by removing the release paper just before installation; and
the multilayer GRSP has improved tensile strength.

2. An anti creep Grooved Rubber Sole Plate (GRSP) comprising:
a. at least one non metallic layer sandwiched between two or more non metallic layers;
b. two opposite surfaces wherein one surface is in contact with rail bottom and the other is in contact with top of sleeper and wherein at least one of its opposite sides is a surface with at least a suitable number of semispherical or similar cavities made and arranged alternately one into another; and
c. a layer of sticker adhesive on the surfaces covered by a release paper;

wherein,
the non metallic layers consist of either rubber or polymeric lining;
the semispherical or similar cavities made and arranged alternately one into another to create vacuum between the two contact surfaces i.e. the GRSP and the rail bottom and the GRSP and the top of sleeper;
the layer of sticker is exposed by removing the release paper just before installation; and
the multilayer GRSP has improved tensile strength.

3. The anti creep Grooved Rubber Sole Plate (GRSP) as claimed in claims 1 and 2, wherein said surfaces have additional longitudinal grooves enabling exit of extraneous matter like water, air trapped between the contact surfaces.

4. The anti creep Grooved Rubber Sole Plate (GRSP) as claimed in claims 1 and 2, wherein the adhesive provides a strong bonding between the contact surfaces.

5. The anti creep Grooved Rubber Sole Plate (GRSP) as claimed in claims 1 and 2, wherein the GRSP restricts any unwanted movement of Rail against the Sleepers.

6. The anti creep Grooved Rubber Sole Plate (GRSP) as claimed in claims 1 and 2, wherein the GRSP attenuates vibrations and absorbs impacts emerging during rolling of rail vehicle wheels.

Dated this 20th day of May, 2015

LALIT AMBASTHA
of Patentwire Consultants Pvt. Ltd.
Agent for the Applicant
[IN/PA 1319]