GB2146373A

GB2146373A - Rail fastening with a laterally adjustable baseplate

Info

Publication number: GB2146373A
Application number: GB08330967A
Authority: GB
Inventors: Peter Pfeiffer
Original assignee: Hoesch Werke AG
Current assignee: Hoesch Werke AG
Priority date: 1983-09-09
Filing date: 1983-11-21
Publication date: 1985-04-17
Also published as: GB2146373B; GB8330967D0; DE3463802D1; IN160537B; EP0136410A3; EP0136410A2; ATE27320T1; DE3332522A1; KE3818A; EP0136410B1

Abstract

In a rail fastening wherein the rail 1 is clamped between locating projections 5 on a base plate 3 secured by screws 6 to a sleeper 4, the bores 7 for the sleeper screws on opposite sides of the rail have different distances 10, 11 from the respective projection 5 whereby the plate 3 can be reversed to effect a lateral adjustment of the rail e.g. to permit changes of track width or compensation for rail wear. <IMAGE>

Description

SPECIFICATION Rail Fastening with an Adjustable Rail Baseplate The invention relates to a rail fastening with an adjustable rail baseplate which is provided with support ribs and fastening bores.

Rail fastenings of this kind permit the rail track width to be corrected by displacement of the baseplate while the fastening positions in the sleeper are retained. Correction of the lateral position of the rail fastening by displacing the rail baseplate in the transverse direction of the rail is performed in accordance with the DD-PS 113781 by means of an eccentric insert which is situated in the fastening bore of the rail baseplate and by its rotation causes lateral displacement of the rail baseplate. According to DE-GM 1 775 242 the transverse displacement of the rail baseplate is achieved by slots, situated at an angle, which thus permit the track width to be varied.Apart from the complex construction of such rail fastening, DD PS 113 781 permits only a slight lateral adjustment and DE-GM 1 775 242 has no unambiguous lateral fixing, so that lateral displacement cannot be precluded, due to travelling over the resiliently fixed rail baseplates, particularly in bends.

It is the problem to be solved by the invention to provide a rail fastening of the initially mentioned kind which also permits substantial changes of track width and ensures unambiguous fixing ofthe lateral position of the rail baseplate.

According to the invention, this problem is solved in that the fastening bores for the sleeper screws are situated at a different distance from the respective support rib situated on the same side as the rail foot.

To enable the track width to be varied in several steps, one additional embodiment of the invention provides that the rail baseplates of a track are constructed with different bore distance differences.

The advantages achieved by the invention are due especially to the fact that without the use of additional components the variable rail fastening permits the track width to be varied in several steps.

Owing to the particularly simple and uncomplicated construction of the subject matter of the invention it is possible for such variations of the track width to be carried out by semi-skilled labourers without technical training. It is another advantage, that any intended change of track width can be performed without any additional effort in terms of measurement and adjustment, since the change of track width is fixed to a specified dimension by the position of the rail baseplate.

One embodiment of the invention to be described in detail herein below is illustrated in the accompanying drawing. Therein: Fig. 1 shows a rail fastening according to the invention as seen in the direction ofthe rail, Fig. 2 shows a track half with sleeper as seen in the direction of the rail with small track width and Fig. 3 a view corresponding to Fig. 2 with a large track width.

In the described embodiment the problem exists that in one country there is a rail network with a smaller track width than in the surrounding countries, for example 1000 mm as compared with 1067 mm. It is intended, that this track width will initially be retained, however conversion to a larger track width shall be made possible without any substantial rebuilding effort at short notice after renewal of an entire line section. This is made possible by the rail fastening according to the invention.

The rail 1 in the embodiment is positioned over a damping base 2 and a rail baseplate 3 on a sleeper 4.

Sleeper screws 6 connect the rail baseplate 3 through fastening bores 7 via a dowel to the sleeper 4. Lateral fixation of the rail 1 is provided by lateral supporting of the rail baseplate against the support ribs 5. Hook screws 8 are secured in pockets of the support ribs 5 in known manner and hold down the rail 1 resiliently or rigidly via a holding down member 9 on the rail foot. According to the invention, the respective distance between support rib 5 and fastening bore 7 of the rail baseplate is different on different sides. The embodiment shows a short distance 10 and a large distance 11.To enable the small track width 12 of 1000 mm to be converted to a larger track width 13 of 1067 mm when necessary, it is provided that the respective rail fastening be constructed with a difference of the distance from support rib 5 to fastening bore 11 minus 10 of 33.5 mm. According to the embodiment it is then provided that to achieve the desired track widening from 1000 mm according to Fig. 2 to 1067 mm according to Fig. 3 by turning over of both rail fastenings of the track. It is however also possible to perform such track widening by turning over only one rail fastening of a track if the difference of the distances 10 minus 11 between support rib 5 and fastening bore 7 amounts to 67 mm.

According to a further embodiment, not illustrated, it is however also possible to compensate for minor track differences in several steps. This is necessary especially if the desired track width no longer exists as the result of severe lateral wear of the rail head. In this case, it is possible to construct one rail fastening of the track with a difference of the distance between support rib and fastening bore of 5 mm and to construct the other rail fastening of the track with a difference of 10 mm.If the fastenings in the original installation state are so installed that the largest possible track width is obtained, it is possible, after lateral wear of the rail head by 5 mm, for the first rail fastening to be turned so that the original track width is restored, after wear of 10 mm on both rails the second rail fastening would be turned, the first fastening having its original position, and after lateral wear of both rail heads amounting totally to 15 mm it is possible, by turning both rail fastenings, for the original track width to be restored. The invention can however also be used for the construction of permanent ways with plates to compensate for manufacturing tolerances in the concrete plates.

1. Rail fastening with an adjustable rail baseplate, provided with support ribs and fastening bores for the sleeper screws, characterized in that the

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Rail Fastening with an Adjustable Rail Baseplate The invention relates to a rail fastening with an adjustable rail baseplate which is provided with support ribs and fastening bores. Rail fastenings of this kind permit the rail track width to be corrected by displacement of the baseplate while the fastening positions in the sleeper are retained. Correction of the lateral position of the rail fastening by displacing the rail baseplate in the transverse direction of the rail is performed in accordance with the DD-PS 113781 by means of an eccentric insert which is situated in the fastening bore of the rail baseplate and by its rotation causes lateral displacement of the rail baseplate. According to DE-GM 1 775 242 the transverse displacement of the rail baseplate is achieved by slots, situated at an angle, which thus permit the track width to be varied.Apart from the complex construction of such rail fastening, DD PS 113 781 permits only a slight lateral adjustment and DE-GM 1 775 242 has no unambiguous lateral fixing, so that lateral displacement cannot be precluded, due to travelling over the resiliently fixed rail baseplates, particularly in bends. It is the problem to be solved by the invention to provide a rail fastening of the initially mentioned kind which also permits substantial changes of track width and ensures unambiguous fixing ofthe lateral position of the rail baseplate. According to the invention, this problem is solved in that the fastening bores for the sleeper screws are situated at a different distance from the respective support rib situated on the same side as the rail foot. To enable the track width to be varied in several steps, one additional embodiment of the invention provides that the rail baseplates of a track are constructed with different bore distance differences. The advantages achieved by the invention are due especially to the fact that without the use of additional components the variable rail fastening permits the track width to be varied in several steps. Owing to the particularly simple and uncomplicated construction of the subject matter of the invention it is possible for such variations of the track width to be carried out by semi-skilled labourers without technical training. It is another advantage, that any intended change of track width can be performed without any additional effort in terms of measurement and adjustment, since the change of track width is fixed to a specified dimension by the position of the rail baseplate. One embodiment of the invention to be described in detail herein below is illustrated in the accompanying drawing. Therein: Fig. 1 shows a rail fastening according to the invention as seen in the direction ofthe rail, Fig. 2 shows a track half with sleeper as seen in the direction of the rail with small track width and Fig. 3 a view corresponding to Fig. 2 with a large track width. In the described embodiment the problem exists that in one country there is a rail network with a smaller track width than in the surrounding countries, for example 1000 mm as compared with 1067 mm. It is intended, that this track width will initially be retained, however conversion to a larger track width shall be made possible without any substantial rebuilding effort at short notice after renewal of an entire line section. This is made possible by the rail fastening according to the invention. The rail 1 in the embodiment is positioned over a damping base 2 and a rail baseplate 3 on a sleeper 4. Sleeper screws 6 connect the rail baseplate 3 through fastening bores 7 via a dowel to the sleeper 4. Lateral fixation of the rail 1 is provided by lateral supporting of the rail baseplate against the support ribs 5. Hook screws 8 are secured in pockets of the support ribs 5 in known manner and hold down the rail 1 resiliently or rigidly via a holding down member 9 on the rail foot. According to the invention, the respective distance between support rib 5 and fastening bore 7 of the rail baseplate is different on different sides. The embodiment shows a short distance 10 and a large distance 11.To enable the small track width 12 of 1000 mm to be converted to a larger track width 13 of 1067 mm when necessary, it is provided that the respective rail fastening be constructed with a difference of the distance from support rib 5 to fastening bore 11 minus 10 of 33.5 mm. According to the embodiment it is then provided that to achieve the desired track widening from 1000 mm according to Fig. 2 to 1067 mm according to Fig. 3 by turning over of both rail fastenings of the track. It is however also possible to perform such track widening by turning over only one rail fastening of a track if the difference of the distances 10 minus 11 between support rib 5 and fastening bore 7 amounts to 67 mm. According to a further embodiment, not illustrated, it is however also possible to compensate for minor track differences in several steps. This is necessary especially if the desired track width no longer exists as the result of severe lateral wear of the rail head. In this case, it is possible to construct one rail fastening of the track with a difference of the distance between support rib and fastening bore of 5 mm and to construct the other rail fastening of the track with a difference of 10 mm.If the fastenings in the original installation state are so installed that the largest possible track width is obtained, it is possible, after lateral wear of the rail head by 5 mm, for the first rail fastening to be turned so that the original track width is restored, after wear of 10 mm on both rails the second rail fastening would be turned, the first fastening having its original position, and after lateral wear of both rail heads amounting totally to 15 mm it is possible, by turning both rail fastenings, for the original track width to be restored. The invention can however also be used for the construction of permanent ways with plates to compensate for manufacturing tolerances in the concrete plates. CLAIMS

1. Rail fastening with an adjustable rail baseplate, provided with support ribs and fastening bores for the sleeper screws, characterized in that the fastening bores (7) for the sleeper screws (6) are situated at a different distance (10, 11) from the respective support rib (5) situated on the same side of the rail foot.

2. Rail fastening according to Claim 1, characterized in that the rail baseplates (3) of a track are constructed with different bore distance differences.