Title of Invention

"A DEVICE FOR FASTENING A RAIL TO A SLEEPER"

Abstract A System for fastening a rail to a sleeper comprising (1) a liner, (2) a shoulder and (3) a rail fastening clip, wherein the liner has a heel-resting portion for resting on the sleeper and a toe-resting portion for over-riding on the foot of the rail, said liner having a curved portion joining the heel-and toe-resting portions of the liner for providing a recess therebetween, said shoulder having a recess inserted in the recess provided in the liner, and said clip having a toe portion resting on the toe-portion of the liner, a heel portion resting on the heel portion of the liner and a middle portion within the recess in the shoulder.
Full Text INTRODUCTION TO THE FIELD OF THE INVENTION.
The present invention relates to a rail fastening device for fastening rails of the railway track on a sleeper or a ballastless track. The sleeper can be made of wood, steel, structural steel or concrete.
KNOWN ART
Presently the rail is fixed to wooden sleepers by rail screws. The screws have to be tightened with caution to the extent that there is a gap between the rail foot and the head of the screw so that it does not exert pressure on the rail foot.
The known arrangement of holding rail with steel/structural steel sleepers consists of steel clip with a lip over-riding the rail foot and nut and bolt arrangement for fixing the steel clip.
DRAWBACKS OF THE PRIOR ART.
The arrangement with steel/structural steel is cumbersome to fix the bolts in particular and holding it while tightening the bolts. The device a large number of components. The device is prone to getting loose due to vibrations imposed by running trains.
The device known for the concrete sleeper makes use of a special clip and the above described two methods suited respectively for wooden and steel sleepers are unfit for the purpose of concrete sleepers
OBJECTS OF THE INVENTION.
It is a primary object of the invention to propose if special liner for use in a rail fastening device which will provide 'Zero'or minimal restraint at the rail foot in the fastened condition.
It is another object of this invention to propose an improved rail fastening device which can be used for all types of sleeper and ballastless track which can be more effective.
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It is yet another object that the Fastening system absorbs vibration by uses of elastic Rail clip and the clip does not loosen.
Yet another object is that the clip used in the fastening device assembly is the normal clip which is in use in track and thus no additional burden is on inventry
It is a further object of the invention to propose an improved rail fastening device which has a zero or minimal restraint on the rail foot for longitudinal movement of the rail, particularly LWR, due to temperature variation or due to other effects, to thereby protect the structure i.e. the pier/abutment of a bridge from unnecessary transfer of thermal forces from the rail to the substructure and vice-versa and from unnecessarily stressing for which the structures are not designed and such structures are essentially continuous in track.
STATEMENT OF THE INVENTION:
According to this invention, there is provided a device for fastening a rail to a sleeper comprising essentially (l) a liner ,
(2) a shoulder and (3) a rail fastening clip, wherein the liner has a heel-resting portion for resting on the sleeper and a toe-resting portion for overriding on the foot of the rail, said liner having a curved portion joining the heel-and toe-resting portions of the liner for providing a recess there between, said shoulder having a recess inserted in the recess provided in the liner, and said rail fastening clip having a toe portion resting on the toe portion of the liner, a heel portion resting on the heel portion of the liner and a middle portion within the recess in the shoulder.
The shoulder is disposed adjacent to the edge of the foot of the rail and in the recess of the liner, said recess facing downward.
In an embodiment, the toe-resting portion of the liner has an inclination corresponding to and slightly off-set to that of the top part of the foot of the rail and when assembled is so adopted as to leave a gap of 1 to 2 mm or more between the under surface of the toe-resting portion of the liner and the upper surface of the foot of the rail.
In another embodiment the toe-resting portion of the liner has a downwardly extending protrusion at the beginning of the inclined under side
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of the liner and is disposed adjacent to and abutting the end of the rail foot anud wherein the said shoulder is disposed slightly further away from the said protrusion.
It is important to note that the top surface of the toe-resting portion of the liner is engaged and pressed down by the toe portion of the clip.
The heel resting portion of the liner rests, on the sleeper and is engaged and pressed down by the heel portion of the said clip.
The central leg, of the clip is engaged into the recess of the shoulder. Two such systems are used, one on each side of the rail foot.
Furthermore, there is provided a bearing plate on the sleeper and said clip is secured to the said bearing plate and a rubber pad is provided beneath the under surface of the foot of the rail.
In another aspect there is provided as per the teaching of the invention , a liner for use in a device for fastening a rail to sleeper comprising a heel-resting portion, a toe-resting portion and a curved portion joining said heel-resting portion and toe-resting portion for providing a recess therebetween.
In a further aspect of the invention there is provided a shoulder for use in a system for fastening a rail to a sleeper, said shoulder comprising two arms between which a recess is provided.
Though any suitable material can be used, to meet the stringent requirements of the Standards of the Railways the liner is made of malleable cast iron, SG iron or steel or glass filled nylon.
The shoulder is made of malleable cast iron or SG iron or steel.
BRIEF DESCRIPTION OF THE DRAWINGS.
The invention will now be briefly described with reference to the accompanying drawings, wherein-Fig. 1. and 4 show sectional views of two special liners for the rail fastening device of the present invention;
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fig.lA is a plan view of Fig.l and show one type of liner .
Fig.2 and 5 show the rail fastening system in sectional view;
Fig.2A is a plan view of Fig.2;
Fig. 3 shows sectional view of a shoulder for the rail fastening system; and
Figs. 3A and 3B respectively show plan view and side view of the shoulder
of Figure 3.
Fig.4A is a plan view of Fig 4 and show another type of liner.
DETAILED DESCRIPTION OF THE DRAWINGS.
As will be clear from the drawings of Fig.2 and 2A, there is provided a liner L as shown in Figures 1 and 1A. This liner L comprises toe-resting portion 1, a heel -resting portion 2 and a curved portion 3 joining the toe-resting and heel-resting portion 1 and 2 respectively a recess 5 being formed beneath the curved portion 3. The toe- resting portion 1 is inclined at an angle 'a' to the horizontal so that the angle is same as the angle of the top or rail foot.
The lowest point 4 of the toe-resting portion is always above, by about 1 to 2 mm or more at the rail edge taking reference from Fig. 1 A, and 3A portions 1 and 2 of the liner may or may not have length L3 equal to length L. as that of shoulder which will be described later. Portion 3 of the liner has a length L2 which is marginally less than the length L1 of the recess in the middle of the shoulder shown in Fig.3B. The length L2 is preferably 1-2 mm less than length L1 of the recess in the middle of the shoulder.
The toe-resting portion (1), the heel-resting portion (2) and the highest point inside curved portion (3) have relative heights to provide for designed toe load of a clip into the assembly with the shoulder of Fig.3.
The liner may be made of malleable cast iron or SG iron or steel or glass-filed nylon as per requirement.
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The shoulder shown in Fig.3, 3A and 3B may be made of malleable cast iron SG iron or steel Fig.3 shows the sectional view of the shoulder S. If can be seen from Fig.3,3A that it has a recess 8 of length L between the two arms 6 and 7 of the shoulder. The apex of the recess is according to the design requirement of the clip for designed toe load. The shoulder has also another recess 9 on the outer periphery of length Li between two faces 10 and 11.
The assembly of the liner and shoulder with the rail clip on a rail sleeper with rail is shown in Fig.2 and 2A.
In its second embodiment, the special liner (Fig.4, 4A) has the toe-resting portion (1); the heel-resting portion (2), the curved portion (3) connecting the portions (1) and (2) and also disposed above the outer periphery of shoulder of Fig.3, 3A and partially into its recess 9. The toe-resting portion (1) over rides the flange of the ail with a gap between the rail and toe-resting portion, as in the First embodiment of the special liner . The heel resting portion 2 rests on sleeper top. Over and above the above features, the second embodiment has stem (12) as in Fig. 4 which protrudes below the point 4 and rests on the top surface level of the sleeper or the base plate fixed to the sleeper. The stem (12) has an advantage that it renders the toe-resting (4) strengthen comparatively more than the first embodiment and its section can be reduced in case of necessity and with advantage that it also facilitates use of different rail sections on the same base plate design.
Partial rail seat assembly with the above embodiment of the special liner is as per Fig.(5) and the usage of elastic rail clip with special liner does not render pressure on rail foot and the pressure is transmitted to the sleeper through stem (12).
It will be seen that the device used for fastening the rail to the sleeper essentially comprises of three components, namely, (1) a Liner (2) a shoulder and (3) a rail fastening clip.
Fig.2 clearly shows as to how the rail is fastened to the sleeper using the novel liner, novel shoulder and a conventional fastening clip.
In Figure 2 there is shown a rail R having its foot-seated on the top ST of a sleeper SL. It can be seen that top of the foot F is extending at an angle equivalent to angle a of the liner (Fig.l) on each side of rail of the
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web W of the rail R. A clip C is mounted on the sleeper with liner (L) and shoulder S interposed between the clip, sleeper and the top of rail foot F on each side of the rail web W. The heel resting portion 2 of liner L rests on the sleeper SL while the toe-resting portion 1 over rides the rail foot F of the rail R. The shoulder S bridges the gap in the curved portion 3 (Fig.l) and a leg C3 of the clip C passes through the recess 8 in the shoulder S (Fig.3). The clip has a toe portion Cl resting on the toe-resting portion 1 of the liner. The heel portion C2 of the clip C rests on the heel-resting portion 2 of the liner. The clip C is driven into the Rail sleeper assembly so that the toe portion Cl grips the rail foot F through the toe-resting portion 1 of the liner and the heel portion C2 grips the sleeper SL through the heel resting portion 2 of the liner.
When the clip is fitted into the assembly, the liner does not move longitudinally due to recess 9 in the shoulder and it is vertically stable due to loads of the clip and portions (1) and (2) of the liner. After fitting of the clip, the bottom face of the heel-resting portion (2) of the liner is in touch with the sleeper top and there is a gap between the face of the toe-resting portion (1) of the liner and the top of rail foot. The system keeps the rail free from pressure of the clip on the rail foot though it is fitted as in general use of the Elastic Fastening system in the track.
The specially designed ' Liner-SP' is continued from the heel shoulder into the recess in the shoulder and then continued on to the rail foot with a gap of 1-2 mm between the liner and the rail foot for permitting rail movement. The clip being elastic in nature, absorbs the vibrations and does not fall off during service.
When the clip is driven into the housing due to force of driving mechanism, the 'Liner-SP has a tendency to slide in the direction of driving force. The wall portion of recess 9 in FIG.3B does not permitr its movement while the vertical stability to the liner is provided by the toe and heel portions Cl and C2 of the elastic rail clip itself.
SPECIAL ASPECTS OF THE INVENTION
What is important to note is that the fastening device uses mainly elastic rail clip widely known for their use in railway track. For anchoring
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such clips in the assembly of rail and sleeper on a bridge, a special housing for the clip C and a special liner L referred to here as Liner-SP' is designed which puts the clip C into action and still does not put restraint on the rail against its longitudinal movement due to temperature variation and due to other effects. T he combined salient features of the 'Shoulder' S and Liner-SP'L is that the 'Liner-SP' does not slip/move in the direction of length of the rail while driving the clip with the stroke of a hammer Or a specially designed tool, for driving the clip into its housing. For this purpose, the invention lies in the fact that the shoulder, an embodiment of the base plate in cases with the steel/wooden sleeper and concrete sleeper bed, and built-in with cast shoulder in case of concrete sleeper, has a recess marginally deep in its middle part length.
The specially designed 'Liner-SP' is continued from the heel shoulder into the recess in the shoulder and then continued on to the rail foot with a gap of 1-2 mm or more between the liner and the rail foot for permitting rail movement. The clip being elastic in nature absorbs the vibrations and does not fall off during service.
The system absorbs vibrations and there is no fear for the fastening to loosen.
Lesser number of components are used in the assembly. Therefore, reduction in inventry of stock is achieved.
The fastener clip is same as in use in approach track to the bridge. Therefore, there is no additional inventry.
The system does not exert force on rail; thus free movement of rail is achieved and is useful on existing bridge structures in particular.
The system can be used on any type of foundation /sleeper with suitably designed bearing plate shoulder. On concrete sleeper it may be used with or without bearing plate with suitably designed shoulders.

WE CLAIMS
1. A device for fastening s rail to a sleeper comprising a
liner (L). a shoulder (S) and a rail fastening clip (C), wherein
the liner has a heel-resting portion (2) for resting on the
sleeper and a toe-resting portion (1) for over-riding on the foot
of the rail said liner (L) having a curved portion (3) joining the
heel-and toe-resting portions of the liner (2) for providing a
recess (5) therebetween, said shoulder having a recess (8)
inserted in the recess provided in the liner, and said clip
having a toe portion (CD resting on the toe-portion (1) of the
liner, a heel portion (C2) resting on the heel portion (2) of the
liner and a middle portion within the recess in the shoulder,,
2. The device as claimed in claim 1,wherein said shoulder is
disposed adjacent to the edge of the foot of the rail and in the
recess (5) of the liner, said recess facing downward.
3. The device as claimed in claims 1 and 2 wherein the two
resting portion (1) of the liner (L) has an inclination
corresponding to and slightly off-set to that of the top part of
the foot of the rail and when assembled is so adopted as to leave
a gap of 1 to2 mm or more between the under surface of the two-
resting portion of the liner and the upper surface of the foot of
the rail.
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4. The device as claimed in claim 1 and 2 wherein the two
resting portion (1) of the liner has a downwardly extending
protrusion at the begining of the inclined under side of the lner
and is disposed adjacent to and abutting the end of the rail foot
and wherein the said shoulder is disposed slightly furt her away
from the said protrusion.
5. The device as claimed in claims 1 to 4 wherein the top
surface of the toe-resting portion (1) of the liner is engased
and pressed down by the top portion of the clip (C).

6. The device as claimed in claim 5 wherein the heel resting
portion of the liner (2) rests on the sleeper (S) and is engaged
and pressed down by ther heel portion (C2) of the said clip (C).
7. The device as claimed in claim 6 wherein the central leg
(C3) of the clip (C) is engaged into the recess (8) of the
shoulder (S).
8. The device as claimed in claims 1 to 7 wherein two such
devices are used one on each side of the rail foot.
9. The device as claimed in claims 1 to 8, wherein there is
provided a bearing plate on the sleeper and said clip is secured
to the said bearing plate.
10. The device as claimed in claims 1 to 9 wherein a rubber pad
is provided beneath the surface of the foot of the rail.
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11. The device as claimed in claim 1, wherein said liner comprises a heel-resting portion, a toe-resting portion and a curved portion joining said heel-resting portion and toe-resting portion and providing a recess therebetween.
12. The device as claimed in claim 1, wherein said shoulder-
comprises two arms between which a recess is provided.
13. The device as claimed in claims 1 to 10 wherein said
liner is made of malleable cast iron, SG iron or steel or glass
filled nylon.
14. The device as claimed in claims 1 to 10 wherein said
shoulder is made of malleable cast iron or SS iron or steel.
15. A liner in a device for fastening a rail to a
sleeper substantially as herein described with reference to
Figures l, 1A, 2, 4, 4A and 5 of the accompanying drawings.
16. A device for fastening -a rail to a sleeper
substantially as herein described with reference to Figures 3,3A,
3B, 2 and 5 of the accompnying drawings.
17. A device for fastening a rail to a sleeper substantially
as herein described with reference to the accompanying drawings.
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18. The device as claimed in any of claims 1 to 10 for use in a fastened rail assembly comprising a rail disposed on at least one sleeper, each side of the foot of the rail having been secured to the sleeper bysaid fastening system.
A System for fastening a rail to a sleeper comprising (1) a liner, (2) a shoulder and (3) a rail fastening clip, wherein the liner has a heel-resting portion for resting on the sleeper and a toe-resting portion for over-riding on the foot of the rail, said liner having a curved portion joining the heel-and toe-resting portions of the liner for providing a recess therebetween, said shoulder having a recess inserted in the recess provided in the liner, and said clip having a toe portion resting on the toe-portion of the liner, a heel portion resting on the heel portion of the liner and a middle portion within the recess in the shoulder.

Documents:

00168-cal-1999-abstract.pdf

00168-cal-1999-assignment.pdf

00168-cal-1999-claims.pdf

00168-cal-1999-correspondence.pdf

00168-cal-1999-description(complete).pdf

00168-cal-1999-drawings.pdf

00168-cal-1999-form-1.pdf

00168-cal-1999-form-13.pdf

00168-cal-1999-form-18.pdf

00168-cal-1999-form-2.pdf

00168-cal-1999-form-3.pdf

00168-cal-1999-g.p.a.pdf

00168-cal-1999-letters patent.pdf

168-CAL-1999-(10-05-2012)-CORRESPONDENCE.pdf

168-CAL-1999-(10-05-2012)-PA-CERTIFIED COPIES.pdf

168-CAL-1999-(12-12-2011)-CERTIFIED COPIES(OTHER COUNTRIES)-(12-12-2011).pdf

168-CAL-1999-(12-12-2011)-CERTIFIED COPIES(OTHER COUNTRIES).pdf

168-CAL-1999-(12-12-2011)-CORRESPONDENCE.pdf

168-CAL-1999-(12-12-2011)-FORM-13-(12-12-2011).pdf

168-CAL-1999-(12-12-2011)-FORM-13.pdf

168-CAL-1999-(14-11-2012)-CORRESPONDENCE.pdf

168-CAL-1999-(14-11-2012)-FORM-13.pdf

168-CAL-1999-(14-11-2012)-OTHERS.pdf

168-CAL-1999-(26-08-2011)-CORRESPONDENCE.pdf

168-CAL-1999-(26-08-2011)-PA.pdf

168-CAL-1999-FORM 15.pdf


Patent Number 207142
Indian Patent Application Number 168/CAL/1999
PG Journal Number 21/2007
Publication Date 25-May-2007
Grant Date 23-May-2007
Date of Filing 03-Mar-1999
Name of Patentee RAHEE INDUSTRIES LTD.,
Applicant Address OF CENTURY TOWERS, 5TH FLOOR,45 SHAKESPEARE SARANI KOL-17
Inventors:
# Inventor's Name Inventor's Address
1 SATYA PAL KHERA CENTURY TOWERS, 5TH FLOOR,45 SHAKESPEARE SARANI KOL-17
PCT International Classification Number B 61 G 7/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA