CA1288082C - Removable self-retaining shoulder block for fastening rails to concrete ties - Google Patents
Removable self-retaining shoulder block for fastening rails to concrete tiesInfo
- Publication number
- CA1288082C CA1288082C CA 467097 CA467097A CA1288082C CA 1288082 C CA1288082 C CA 1288082C CA 467097 CA467097 CA 467097 CA 467097 A CA467097 A CA 467097A CA 1288082 C CA1288082 C CA 1288082C
- Authority
- CA
- Canada
- Prior art keywords
- shoulder block
- base plate
- rail
- tie
- projection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B9/00—Fastening rails on sleepers, or the like
- E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
- E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
- E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
- E01B9/303—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips the clip being a shaped bar
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B9/00—Fastening rails on sleepers, or the like
- E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
- E01B9/04—Fastening on wooden or concrete sleepers or on masonry without clamp members
- E01B9/14—Plugs, sleeves, thread linings, or other inserts for holes in sleepers
- E01B9/18—Plugs, sleeves, thread linings, or other inserts for holes in sleepers for concrete sleepers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Railway Tracks (AREA)
Abstract
ABSTRACT
In a rail fastening for use with concrete ties a two piece self-retaining shoulder block is employed.
Shoulder blocks of varying types are well-known in the art, but those generally employed for use with concrete ties are one piece shoulder blocks embedded within the tie. The problem with the presently used shoulder blocks is that when a concrete tie becomes worn and must be changed it is necessary to dig out the crib bed to allow the tie to be lowered such that it may clear the shoulder block in order to be removed out from under the rails.
The present invention overcomes this difficulty by providing a two piece shoulder block whereby the top portion is removed so that the tie may be pushed out directly without disturbing the crib bed.
In a rail fastening for use with concrete ties a two piece self-retaining shoulder block is employed.
Shoulder blocks of varying types are well-known in the art, but those generally employed for use with concrete ties are one piece shoulder blocks embedded within the tie. The problem with the presently used shoulder blocks is that when a concrete tie becomes worn and must be changed it is necessary to dig out the crib bed to allow the tie to be lowered such that it may clear the shoulder block in order to be removed out from under the rails.
The present invention overcomes this difficulty by providing a two piece shoulder block whereby the top portion is removed so that the tie may be pushed out directly without disturbing the crib bed.
Description
~8808~
This invention relates to rail fastenin~s and more particularly to rail fastenings for use with concrete ties.
Use of rail fastenings to hold rails upon ties are known in the art. Prior to the use of the new concrete or plastic type ties wooden ties were used. A base plate was inserted between the tie and the rail and spikes secured the base plate to the rail to prohibit lateral or sideways movement. The head of the spike itself rested upon the rail shoulder thereby prohibiting vertical movement.
Concrete ties are generally employed for use on modern railroads. In order to hold the rail and prohibit it from lateral and vertical movement various types of base plates and shoulder blocks have been employed. One method of meeting the new requirements of concrete ties is to manufacture the preformed concrete tie with a one piece shoulder block embedded within it.
The ties are set in place and the rail laid between two sets of shoulder blocks. Thereafter, a resilient rail clip or ~androl*
clip is inserted through the bore hole in the shoulder block to prevent the rail from vertically moving; while the shoulder block prevents the rail from moving laterally.
Difficulties, however, arise when some concrete ties, due to the imperfections in the casting, or overdue stress begin to wear and crack. It is then necessary to change the tie. Since the top part of the shoulder block protrudes one and a half inches above the base of the rail, the rail cannot be lifted over the shoulder block to allow the tie to be removed ~hen changing the concrete tie on a spot removal.
* Trade Mark - 1 -~ Z8808~
It is necessary instead to scarify the crib area immediately adjacent the tie to the depth of at least one and a half inches below the bottom of the tie. The tie is then levered over into the removal slot and then withdrawn from under the track and a replacement tie inserted in reverse order. The crib must then be filled and tamped in order to secure the ballast. One of the difficulties with the tamping process is that the newly tamped road bed is never as solid as an established road bed and track stability could be affected in hot weather. The process is slow and inefficent and may require six to eight man hours for the removal of each tie.
As an alternative to the embedded type of shoulder block, precast ties with cavities adjacent the predetermined rail position or precast ties with outside lips or raised portions have also been used. The raised portion on the extremities of the tie prevents lateral movement when a base or shoulder block is placed between the lip and the rail. Such a raised outside portion on a tie can be found illustrated in Canadian Patent 1,145,729. The difficulty of tie removal, however, still persists as the tie must be levered over into a disturbed lower road bed in order that the lip on the upper surface of the tie can clear the underside of the rail when the tie is removed.
A third method of fastening rails to concrete ties is accomplished by making preformed threaded bore holes in the concrete tie. Bolts secure shoulder blocks and base blocks, and are threaded into the bore holes. These clamp the shoulder ~!.X88082 block portivn and secure the base of the rail. With this type of arrangement, the bolts and clamps can be removed and the concrete tie pulled directly from under transversely to the rails. The difficulty is that these devices are complex, cumbersome and take a great amount of time to position. Rail fastenings of this latter type are found in Canadian Patents Nos. 891,373, 997,730 and 1,062,675.
It is an object of the present invention to provide a simple two piece self-retaining shoulder block which can be quickly and easily placed in the operating position, or removed, permitting easy replacement of concrete ties.
It is a further object of the present invention to provide a rail fastening which has a minimal number of components, can be tapped into place by an applied force, and is self-retaining.
Therefore, this invention provides a two piece self-retaining rail fastener for securing a rail to a concrete tie comprising: a lower base plate adapted to be permanently embedded in a tie with the upper most portion of said base plate in the same plane or lower than the upper surface of the tie; an upper shoulder block including an upper portion which abuts the rail when in use, a lower portion the surface of which is adapted to co-operate in an interlocking position with the upper surface of said base plate, and a bore hole for use with a resilient rail clip; said base plate being formed with a retaining means to prevent lateral movement of the shoulder block; whereby when in use, reactive forces exerted by the resilient rail clip against the rail and shoulder block, fixedly engage said shoulder block 808~
to said base in the interlocking position.
In the present invention, precast concrete ties are manufactured with the base plate of the shoulder block embedded in the concrete tie. For a normal tie constructed for use with the standard two rails, four such shoulder block base plates are embedded. After the concrete ties are inserted, the rails are laid in the appropriate position and the upper portion of the two piece shoulder block is inserted with the use of a hammer or other instrument.
In a first embodiment of the invention the upper shoulder block is equipped with a projection on one side and a sloped bottom on the other. The embedded base plate contains a groove adapted to receive the projection and a retaining lip adjacent the sloped bottom surface, opposite the groove. The upper shoulder block is also equipped with a projection on its bottom surface to serve as a retaining key. The upper surface of the base plate is recessed to receive this key projection, such that when the two parts are fitted together, longitudinal motion (i.e. motion in the direction of the rails) of the shoulder block is restrained.
The key and recessed keyway are so configured as to provide a force fit of the key within the keyway, thereby preventing movement of the shoulder block during installation of a resilient rail clip, such as that manufactured by the Pandrol Corporation and marketed as a"Pandrol clip". The resilient rail clip used is preferably in the form of an open ended "figure 8". The "figure 8'1 is con-torted such that when in use, one end and the mid section are lower than the end which is inserted through the bore hole. The - ~2~808~
Pandrol* clip is fitted in such a way that the mid section of the clip rests upon the foot flange of the rail, providing a constant downward exerted pressure. The other end of the clip rests on a portion of the upper shoulder block opposite the side of the foot flange. While the clip generates forces on both the shoulder block and the rail base, there is a tendency for the shoulder block to rotate about the inside portion of the bore hole in a counter-clockwise direction towards the rail base thereby driving the projection firmly into the groove in the base plate.
In a second embodiment of the invention the upper shoulder block is provided with two projections or ribs and the lower base plate is provided with two grooves adapted to receive the ribbed shoulder block. The upper block is inserted longitudinally into the lower base place, and since the grooves and ribs are tapered slightly, the shoulder block wedges itself within the lower base plate.
With constant operation upon the track bed a concrete tie, due to defects or excessive wear, becomes damaged or cracked and it is necessary to remove it on a spot basis. One simply removes the resilient rail clip with the use of a hammer or the like and taps out the upper shoulder blocks. This leaves the concrete tie with the rails resting on it with base plates flush with or slightly lower than the upper surface of the tie. By levering or applying a force on the end of the tie,or by the use of standard mechanized tie removal equipment, the tie may be removed quickly and easily without any disturbance of the underlying ballast bed. A new tie is then inserted and the reverse operation is performed. The entire tie change operation can be completed in a *Trade Mark - 5 -~288~82 fraction o the time required for the removal of ties with the prior art rail fastenings.
- - 5a -The overall result is more efficient tie handling, and minimum rail bed disturbance, thereby resulting in better track stability.
In a further embodiment the upper shoulder block can be constructed with varying heights. If it becomes necessary to shim the track during seasonal weather fluctuations, the bore hole for the pandrol clip will be located at the correct height to ensure the prevention of sideways and vertical movement of the rail.
The invention is more fully described in conjunction with the accompanying drawings wherein:
Figure 1 is a perspective view of a two piece single flanged shoulder block;
Figure 2 is a perspective view of a two piece double flanged shoulder block;
Figure 3 is a longitudinal cross section of a rail tie with two two-piece single flanged shoulder blocks maintaining a rail in position;
Figure 4 is a force diagram illustrating the forces on the shoulder block and rail in the interlocking position.
In Figure 1 one sees an illustration of an upper shoulder block 1 and a lower base plate 2 in the operative position. The upper block 1 has a bore hole 3 and a shoulde~ 4 for receiving a pandrol* cli~ (not shown). The upper shoulder block has a sloped bottom 6 which is adapted to be received by the sloped upper surface of the base plate 7. The lower base plate 7 is equipped with a lip 5 and a groove 12. The latter groove 12 is adapted to receive the longitudinal flange or rib 11 of the upper shoulder block 1. To prevent longitudinal move~lent of the * Trade Mark ~l~88082 shoulder block during installation of the Pandrol* clip, the key 9 projection of the shoulder block is retained by the recess or key way 10 of the base plate 8. The upper portion of the base plate 8 is flush with the surface of the concrete tie (not shown). In Figure 1 in order to place the shoulder block in the base plate the rib 11 enters the recessed portion of the base plate and is forced into the groove 12. The sloped bottom of the upper block 7 aids the operation.
In Figure 2 one views a second embodiment of the invention, a double-flanged or ribbed shoulder block and double-grooved base plate. One notes the top of the base plate 2 is flush with the surface of the concrete tie 13. In order to secure the double ribbed shoulder block into the double grooved base plate it is necessary to tap the shoulder block longitudinally from the side of the base plate. A slight taper in one direction of the grooves 12 and ribs 11 respectively allows the shoulder block to be inserted in a wedge like manner.
In Figure 3 a rail 17 is placed on the surface of a concrete tie 13 and a Pandrol* clip 15 is inserted in the bore hole 3 of the upper shoulder block 1. While one end of the Pandrol* clip is fitted into the bore hole of the shoulder block 3, the mid-section rests upon the foot of the rail 18 and the opposite end 16 rests on a shoulder 4 of the shoulder block on the side opposite to the rib 11.
* Trade Mark ~L~ -- 7 ~2880aX
Figure 4 illustrates the self-locking concept used in the single ribbed shoulder block. The Pandrol*
clip generates forces on the shoulder block and rail base which tend to cause the shoulder block to rotate about point B as shown in the direction of the arrow D thereby driving the rib 11 into the groove 12 of the base plate firmly. The forces of the Pandrol* clip thereby prevent the lifting of the block from the base plate as the block in the base plate is self-locking.
It is understood that this invention is not limited to the illustration shown but can have many various combinations or changes without departing from the spirit of the invention.
* Trade Mark
This invention relates to rail fastenin~s and more particularly to rail fastenings for use with concrete ties.
Use of rail fastenings to hold rails upon ties are known in the art. Prior to the use of the new concrete or plastic type ties wooden ties were used. A base plate was inserted between the tie and the rail and spikes secured the base plate to the rail to prohibit lateral or sideways movement. The head of the spike itself rested upon the rail shoulder thereby prohibiting vertical movement.
Concrete ties are generally employed for use on modern railroads. In order to hold the rail and prohibit it from lateral and vertical movement various types of base plates and shoulder blocks have been employed. One method of meeting the new requirements of concrete ties is to manufacture the preformed concrete tie with a one piece shoulder block embedded within it.
The ties are set in place and the rail laid between two sets of shoulder blocks. Thereafter, a resilient rail clip or ~androl*
clip is inserted through the bore hole in the shoulder block to prevent the rail from vertically moving; while the shoulder block prevents the rail from moving laterally.
Difficulties, however, arise when some concrete ties, due to the imperfections in the casting, or overdue stress begin to wear and crack. It is then necessary to change the tie. Since the top part of the shoulder block protrudes one and a half inches above the base of the rail, the rail cannot be lifted over the shoulder block to allow the tie to be removed ~hen changing the concrete tie on a spot removal.
* Trade Mark - 1 -~ Z8808~
It is necessary instead to scarify the crib area immediately adjacent the tie to the depth of at least one and a half inches below the bottom of the tie. The tie is then levered over into the removal slot and then withdrawn from under the track and a replacement tie inserted in reverse order. The crib must then be filled and tamped in order to secure the ballast. One of the difficulties with the tamping process is that the newly tamped road bed is never as solid as an established road bed and track stability could be affected in hot weather. The process is slow and inefficent and may require six to eight man hours for the removal of each tie.
As an alternative to the embedded type of shoulder block, precast ties with cavities adjacent the predetermined rail position or precast ties with outside lips or raised portions have also been used. The raised portion on the extremities of the tie prevents lateral movement when a base or shoulder block is placed between the lip and the rail. Such a raised outside portion on a tie can be found illustrated in Canadian Patent 1,145,729. The difficulty of tie removal, however, still persists as the tie must be levered over into a disturbed lower road bed in order that the lip on the upper surface of the tie can clear the underside of the rail when the tie is removed.
A third method of fastening rails to concrete ties is accomplished by making preformed threaded bore holes in the concrete tie. Bolts secure shoulder blocks and base blocks, and are threaded into the bore holes. These clamp the shoulder ~!.X88082 block portivn and secure the base of the rail. With this type of arrangement, the bolts and clamps can be removed and the concrete tie pulled directly from under transversely to the rails. The difficulty is that these devices are complex, cumbersome and take a great amount of time to position. Rail fastenings of this latter type are found in Canadian Patents Nos. 891,373, 997,730 and 1,062,675.
It is an object of the present invention to provide a simple two piece self-retaining shoulder block which can be quickly and easily placed in the operating position, or removed, permitting easy replacement of concrete ties.
It is a further object of the present invention to provide a rail fastening which has a minimal number of components, can be tapped into place by an applied force, and is self-retaining.
Therefore, this invention provides a two piece self-retaining rail fastener for securing a rail to a concrete tie comprising: a lower base plate adapted to be permanently embedded in a tie with the upper most portion of said base plate in the same plane or lower than the upper surface of the tie; an upper shoulder block including an upper portion which abuts the rail when in use, a lower portion the surface of which is adapted to co-operate in an interlocking position with the upper surface of said base plate, and a bore hole for use with a resilient rail clip; said base plate being formed with a retaining means to prevent lateral movement of the shoulder block; whereby when in use, reactive forces exerted by the resilient rail clip against the rail and shoulder block, fixedly engage said shoulder block 808~
to said base in the interlocking position.
In the present invention, precast concrete ties are manufactured with the base plate of the shoulder block embedded in the concrete tie. For a normal tie constructed for use with the standard two rails, four such shoulder block base plates are embedded. After the concrete ties are inserted, the rails are laid in the appropriate position and the upper portion of the two piece shoulder block is inserted with the use of a hammer or other instrument.
In a first embodiment of the invention the upper shoulder block is equipped with a projection on one side and a sloped bottom on the other. The embedded base plate contains a groove adapted to receive the projection and a retaining lip adjacent the sloped bottom surface, opposite the groove. The upper shoulder block is also equipped with a projection on its bottom surface to serve as a retaining key. The upper surface of the base plate is recessed to receive this key projection, such that when the two parts are fitted together, longitudinal motion (i.e. motion in the direction of the rails) of the shoulder block is restrained.
The key and recessed keyway are so configured as to provide a force fit of the key within the keyway, thereby preventing movement of the shoulder block during installation of a resilient rail clip, such as that manufactured by the Pandrol Corporation and marketed as a"Pandrol clip". The resilient rail clip used is preferably in the form of an open ended "figure 8". The "figure 8'1 is con-torted such that when in use, one end and the mid section are lower than the end which is inserted through the bore hole. The - ~2~808~
Pandrol* clip is fitted in such a way that the mid section of the clip rests upon the foot flange of the rail, providing a constant downward exerted pressure. The other end of the clip rests on a portion of the upper shoulder block opposite the side of the foot flange. While the clip generates forces on both the shoulder block and the rail base, there is a tendency for the shoulder block to rotate about the inside portion of the bore hole in a counter-clockwise direction towards the rail base thereby driving the projection firmly into the groove in the base plate.
In a second embodiment of the invention the upper shoulder block is provided with two projections or ribs and the lower base plate is provided with two grooves adapted to receive the ribbed shoulder block. The upper block is inserted longitudinally into the lower base place, and since the grooves and ribs are tapered slightly, the shoulder block wedges itself within the lower base plate.
With constant operation upon the track bed a concrete tie, due to defects or excessive wear, becomes damaged or cracked and it is necessary to remove it on a spot basis. One simply removes the resilient rail clip with the use of a hammer or the like and taps out the upper shoulder blocks. This leaves the concrete tie with the rails resting on it with base plates flush with or slightly lower than the upper surface of the tie. By levering or applying a force on the end of the tie,or by the use of standard mechanized tie removal equipment, the tie may be removed quickly and easily without any disturbance of the underlying ballast bed. A new tie is then inserted and the reverse operation is performed. The entire tie change operation can be completed in a *Trade Mark - 5 -~288~82 fraction o the time required for the removal of ties with the prior art rail fastenings.
- - 5a -The overall result is more efficient tie handling, and minimum rail bed disturbance, thereby resulting in better track stability.
In a further embodiment the upper shoulder block can be constructed with varying heights. If it becomes necessary to shim the track during seasonal weather fluctuations, the bore hole for the pandrol clip will be located at the correct height to ensure the prevention of sideways and vertical movement of the rail.
The invention is more fully described in conjunction with the accompanying drawings wherein:
Figure 1 is a perspective view of a two piece single flanged shoulder block;
Figure 2 is a perspective view of a two piece double flanged shoulder block;
Figure 3 is a longitudinal cross section of a rail tie with two two-piece single flanged shoulder blocks maintaining a rail in position;
Figure 4 is a force diagram illustrating the forces on the shoulder block and rail in the interlocking position.
In Figure 1 one sees an illustration of an upper shoulder block 1 and a lower base plate 2 in the operative position. The upper block 1 has a bore hole 3 and a shoulde~ 4 for receiving a pandrol* cli~ (not shown). The upper shoulder block has a sloped bottom 6 which is adapted to be received by the sloped upper surface of the base plate 7. The lower base plate 7 is equipped with a lip 5 and a groove 12. The latter groove 12 is adapted to receive the longitudinal flange or rib 11 of the upper shoulder block 1. To prevent longitudinal move~lent of the * Trade Mark ~l~88082 shoulder block during installation of the Pandrol* clip, the key 9 projection of the shoulder block is retained by the recess or key way 10 of the base plate 8. The upper portion of the base plate 8 is flush with the surface of the concrete tie (not shown). In Figure 1 in order to place the shoulder block in the base plate the rib 11 enters the recessed portion of the base plate and is forced into the groove 12. The sloped bottom of the upper block 7 aids the operation.
In Figure 2 one views a second embodiment of the invention, a double-flanged or ribbed shoulder block and double-grooved base plate. One notes the top of the base plate 2 is flush with the surface of the concrete tie 13. In order to secure the double ribbed shoulder block into the double grooved base plate it is necessary to tap the shoulder block longitudinally from the side of the base plate. A slight taper in one direction of the grooves 12 and ribs 11 respectively allows the shoulder block to be inserted in a wedge like manner.
In Figure 3 a rail 17 is placed on the surface of a concrete tie 13 and a Pandrol* clip 15 is inserted in the bore hole 3 of the upper shoulder block 1. While one end of the Pandrol* clip is fitted into the bore hole of the shoulder block 3, the mid-section rests upon the foot of the rail 18 and the opposite end 16 rests on a shoulder 4 of the shoulder block on the side opposite to the rib 11.
* Trade Mark ~L~ -- 7 ~2880aX
Figure 4 illustrates the self-locking concept used in the single ribbed shoulder block. The Pandrol*
clip generates forces on the shoulder block and rail base which tend to cause the shoulder block to rotate about point B as shown in the direction of the arrow D thereby driving the rib 11 into the groove 12 of the base plate firmly. The forces of the Pandrol* clip thereby prevent the lifting of the block from the base plate as the block in the base plate is self-locking.
It is understood that this invention is not limited to the illustration shown but can have many various combinations or changes without departing from the spirit of the invention.
* Trade Mark
Claims (7)
1. A two piece self-retaining rail fastener for securing a rail to a concrete tie comprising;
a lower base plate adapted to be permanently embedded in a tie with the upper most portion of said base plate in the same plane or lower than the upper surface of the tie;
an upper shoulder block including an upper portion which abuts the rail when in use, a lower portion the surface of which is adapted to co-operate in an interlocking position with the upper surface of said base plate, and a bore hole for use with a resilient rail clip;
said base plate being formed with a retaining means to prevent lateral movement of the shoulder block:
whereby when in use, reactive forces exerted by the resilient rail clip against the rail and shoulder block, fixedly engage said shoulder block to said base in the interlocking position.
a lower base plate adapted to be permanently embedded in a tie with the upper most portion of said base plate in the same plane or lower than the upper surface of the tie;
an upper shoulder block including an upper portion which abuts the rail when in use, a lower portion the surface of which is adapted to co-operate in an interlocking position with the upper surface of said base plate, and a bore hole for use with a resilient rail clip;
said base plate being formed with a retaining means to prevent lateral movement of the shoulder block:
whereby when in use, reactive forces exerted by the resilient rail clip against the rail and shoulder block, fixedly engage said shoulder block to said base in the interlocking position.
2. A device as claimed in claim 1 wherein the lower portion of said shoulder block includes at least one projection, and the upper surface of said base plate includes at least one recess, said recess adapted to receive said projection in the interlocking position.
3. A device as claimed in claim 2 wherein a first projection is in the form of a longitudinal rib, located on the lower side of the said shoulder block adjacent the rail foot, and a first recess is in the form of a longitudinal groove in the upper side surface of said base plate.
4. A device as claimed in claim 3 wherein said retaining means is a vertically extending lip located on the uppermost portion of said base plate and opposite said longitudinal groove; said lip preventing lateral movement of said shoulder block away from the said rail.
5. A device as claimed in claims 2 or 3 wherein said shoulder block includes a second projection and said base plate includes a second recess; said recess and said projection being located on the side opposite said first recess and said first projection, wherein said projections and said recesses converge longitudinally in the same direction and said shoulder block, when inserted in said base plate longitudinally in the converging direction, interlocks in the form of a wedge.
6. A device as claimed in claim 4 wherein the lower surface of said shoulder block and upper surface of said base plate adjacent said lip co-operate with each other and are sloped downwardly.
7. A device as claimed in claims 1, 2, or 3 wherein the upper surface of said base plate includes a recess in the form of a key way, adapted to receive a key projection of said shoulder block said key projection preventing longitudinal movement of said shoulder block when in use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 467097 CA1288082C (en) | 1984-11-06 | 1984-11-06 | Removable self-retaining shoulder block for fastening rails to concrete ties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 467097 CA1288082C (en) | 1984-11-06 | 1984-11-06 | Removable self-retaining shoulder block for fastening rails to concrete ties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1288082C true CA1288082C (en) | 1991-08-27 |
Family
ID=4129082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 467097 Expired CA1288082C (en) | 1984-11-06 | 1984-11-06 | Removable self-retaining shoulder block for fastening rails to concrete ties |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1288082C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444059A (en) * | 2010-09-20 | 2012-05-09 | 三标工程建筑株式会社 | Elastic clip for fixing railway rail and method for installing the same |
-
1984
- 1984-11-06 CA CA 467097 patent/CA1288082C/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444059A (en) * | 2010-09-20 | 2012-05-09 | 三标工程建筑株式会社 | Elastic clip for fixing railway rail and method for installing the same |
| CN102444059B (en) * | 2010-09-20 | 2014-05-14 | 三标工程建筑株式会社 | Elastic clip for fixing railway rail |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |