WO2009129759A1

WO2009129759A1 - Point roller chair

Info

Publication number: WO2009129759A1
Application number: PCT/CZ2009/000055
Authority: WO
Inventors: Josef Adamec; Jan HANZALÍK; Michal Solar
Original assignee: Azd Praha S.R.O.
Priority date: 2008-04-24
Filing date: 2009-04-20
Publication date: 2009-10-29
Also published as: CZ2008256A3; CZ301287B6

Abstract

The point roller chair for assembly on the flange of the stock rail under the blade is made by a roller holder (1) with at least one lifting roller (6) of the blade (7), during which each of the lifting rollers (6) is connected to the roller holder (1) through a square bolt (5) sliding inserted in the roller holder's (1) slot and the roller holder (1) is connected or makes up one whole with a fixed jaw (2) of mechanism for attachment to the flange (4) of the stock rail (15), which also contains the stock jaw (3) with the locking nut (16).

Description

Point Roller Chair

Technical Field

The invention concerns the point roller chair, which is part of the point structure used in the area of all types of railway traffic where track points are used for crossing and diverting lines.

The point roller chair is one of the types of "blade lifters" that lifts the point blades when throwing over the points, which essentially removes the necessity of lubricating the slide rollers, making it possible to lower the values of the total point work, which results in the noticeable protection of the environment and saving of energy.

Background of the Invention

Lifters are operated in railway networks. The point manufacturers integrate them directly into the slide rollers of the affected sleepers (rollers or ball bearings) or else they are used as auxiliary equipment working on various principles (rollers, rotary segments with rollers, rotary segments).

The blades are lifted constantly in an adjacent and outlying position or the blades are lifted constantly in an outlying position according to a combination of the possibilities.

The solutions of the lifters that are permanently integrated directly into the slide rollers by the point manufacturers has the disadvantage that they constantly lift the blades minimally in the places where the width of the flange of the blade is already larger than the blade's movement when it is thrown over. Moreover, for this solution to be effective the precise position of the blade and the surfaces of the slide rollers, which entails more frequent controls and maintenance demands, while leading to a more frequent fouling of the rollers' chambers due to loose bodies from the passing trains and dirt from the surroundings falling in. This solution is also more expensive and less variable with respect to the operating tolerances of the points. The additional assembly of these lifters on the operation of the points is problematic and expensive.

The solutions of the lifters that are applied as auxiliary equipment sometimes do not lift the blades without additional modifications but only lighten them, which represents a technically uncertain state, requiring the continued lubrication of the sliding rollers or else it also constantly lifts the blades minimally in the places where the width of the flange of the blade is already larger than the blade's movement when it is thrown over. Sometimes the assembly location of these types of lifters in the given type of the point is directly prescribed, so its effectiveness is again influenced by the technical state of the point or it leads to a collision with other auxiliary equipment in the point.

The solution of lifters that use rotary segments located in the bearing of the flange attached to the sleepers for lifting the blades demonstrate the imperfection given by the use of segments of the same radius, which either causes the completion of the operating movement in contact with the sliding roller or on the contrary causes the opening of the lightened blade in the raised position depending on the gap of the blades.

Because, however, all the aforementioned solutions result in a partial or complete lifting of the blade in the outlying, and sometimes also the adjacent position above the upper surface of the sliding rollers, they do not achieve the stable position of the blade, which results in its additional strain from vibrations and impacts from passing vehicles. The vibration of the blade can lead to a decrease in its lifespan and can sometimes lead to the blade's movements. Some solutions, moreover, demand the drilling of holes into the blade, which certainly bring an increase of expenses and a decrease of its stability, so the possibilities of its use is considerably limited.

Thus an optimal roller chair solution is one that only lifts the blades when being thrown over and the blades lie on the original sliding rollers in the in the end positions, adjacent and outlying, and a solution that is variable and does not require any significant interference with the point.

Summary of the Invention

The aforementioned deficiencies are eliminated to a certain extent by a point roller chair for assembly on the flange of the stock rail under the blade according to this invention, the essence of which consists in that it is made by a roller holder with at least one lifting roller of the blade, during which each of the lifting rollers is connected to the roller holder through a square bolt displaceably inserted in the roller holder's slot and the roller holder is connected or makes up one whole with a fixed jaw for attachment to the flange of the stock rail, which also contains the stock jaw with the locking nut. The main advantage of this invention is seen in the fact that the blades are only lifted when thrown over and in both end positions the entire surface of the flange of the blade lies on the surface of the sliding . The point roller chair according to this invention also enables the additional assembly on points in worse technical condition and does not require any intervention in the points. The assembly is very fast and easy. In order to fulfil the required function the point roller chair is arranged so that it is comprised by a simple fixed holder of eccentric lifting rollers attached to the flange of the stock rail and by a profiled replaceable fishplate attached to the flange of the blade by a bolt.

When the blade is adjacent to the stock rail, it enables the joint position of the eccentric lifting roller and the profiled replaceable fishplate full contact with the sliding roller and thus its full use of load. When throwing over, the profiled replaceable fishplate gradually runs into the oblique surface on the eccentric lifting roller, thus gradually lifting the blade. During further movement the profiled replaceable fishplate gradually passes on to the first and second eccentric lifting roller and ultimately slides into the end outlying position. Here the blade is once again in full contact with the sliding roller. In the return movement when throwing over the function is completely identical. When there is a smaller blade gap it is possible to also equip the holder with only one eccentric lifting roller.

Moreover, the profiled replaceable fishplate in the blade's end outlying position increases its stability with a tight fit in the stock rail and eliminates its retrogradation after the throwing over is complete.

The eccentric lifting roller in combination with the profiled replaceable fishplate enables the lifting of the blades by about 1 to 3 mm and, when throwing over, limits the blade's contact with the sliding surface of the rollers, thus significantly extending any surface repairs as well as its lifespan.

Another advantage of the point roller chair according to this invention is seen in the fact that it is essentially not necessary to lubricate the sliding rollers. Eliminating the lubrication of the points' sliding rollers then brings considerable savings of direct expenses, the elimination of human labour, resolves the ecological problem of lubricating the points and, by decreasing the size of the total operations increases the reliability of the throwing over equipment. An especially valuable characteristic of the point roller chairs according to the invention is also the fact that their use is not limited by the speed of the transit through the point and that it is not necessary to take the influence of speed into account and they are resistant against the influences of railway traffic by their placement, attachment and shape. It is advantageous for proper functionality that the lifting rollers have a stamped surface and are equipped with self-lubricating bushes, that the eccentric position of the lifting rollers defining the value of the lifting of the blade is determined in the roller holder by square bolts, that the blade bears on the surface of the roller holder or on the surface of its lifting roller through the replaceable fishplate of the shackle, which has an oblique surface on both sides and a flat surface in the middle created on its lower bearing side, that the shackle is attached to the flange of the blade and secured using locking nuts and an adjusting bolt.

Description of the Figures on the Diagrams The invention will be described in more detail using the diagrams in which fig.l shows the roller chair displayed with two rollers in the blade's adjacent position and in fig. 2 the roller chair is displayed with two rollers in the blade's outlying position.

Implementation Examples

The point roller chair for assembly on the flange 4 of the stock rail 15, under the blade 7 according to figs. 1 and 2 is comprised by a roller holder i with one lifting roller 6 of a blade 7. The lifting roller 6 is connected to the roller holder 1 through a square bolt 5 inserted slidingly in the slot of the roller holder I. The roller holder I is connected or forms one whole with a fixed jaw 2 of mechanism for attachment to the flange 4 of the stock rail 15, which also contains the stock jaw 3 with the locking nut 16. The lifting rollers 6 have a stamped surface and are equipped with self- lubricating bushes 8. The eccentric position of the lifting rollers 6 defining the value of the lifting of the blade 7 is determined in the roller holder 1 by square bolts 5_. The blade 7 bears on the surface of the roller holder I or on the surface of its lifting roller 6 through the replaceable fishplate 9 of the shackle K), which has an oblique surface on both sides 12, 13 and a flat surface 14 in the middle created on its lower bearing side. The shackle H) is attached to the flange ϋ of the blade 7 and secured using locking nuts 17, JJ, and an adjusting bolt 19.

Two square bolts 5, marked on the side by numbers corresponding to the level of lifting in millimetres and on which lifting rollers 6 with a slightly convex shape are placed eccentrically, are built into the fixed jaws 2 of the roller holder L A combination of adjusting of the square bolts 5 with the lifting rollers 6 provides the necessary lifting of the thrown over blade 7 over the sliding rollers to enable corrections according to the point's operational state. The lifting rollers 6 are equipped inside with self-lubricating bushes 8 not requiring maintenance.

The replaceable fishplate 9 fastened by the shackle 10 for assembly on the flange H of the blade 7 has a functional surface comprised of two oblique surfaces

12, 13 and a middle straight surface 14. This makes it possible after the point to be thrown over by the blades 7 in the end positions abutting fully on the sliding rollers, which is the essential and unique advantage of the solution.

The attachment of the roller holder 1 to the stock rail 15 and the replaceable fishplate 9 to the blade 7 is ensured using locking nuts Jj6, 17 and 18 and an adjusting bolt 19, which ensures the definite and reliable attachment to the blade 7 along the entire length of the blade without any additional modifications to the blade required.

Industrial Appplicability

The point roller chair is useable industrially as part of a point structure used in the area of all types of railway traffic where track points are used for crossing and diverting lines. List of Abbreviations

1 roller holder

2 fixed jaw 3 stock jaw

4 flange of the stock rail

5 square bolt

6 lifting roller

7 blade 8 self-lubricating bush

9 replaceable fishplate

10 shackle

11 flange of blade

12, 13 oblique surfaces 14 straight surface 15 stock rail 16, 17, 18 locking nut 19 adjusting bolt

Claims

The point roller chair for assembly on the flange of the stock rail under the blade is characterised in that it is made by a roller holder (1) with at least one lifting roller (6) of the blade (7), during which each of the lifting rollers (6) is connected to the roller holder (1) through a square bolt (5) sliding inserted in the roller holder's (1) slot and the roller holder (1) is connected or makes up one whole with a fixed jaw (2) of mechanism for attachment to the flange (4) of the stock rail (15), which also contains the stock jaw (3) with the locking nut (16).

2. The point roller chair according to claim 1 is characterised in that the lifting rollers (6) have a stamped surface and are equipped with self-lubricating bushes (8).

3. The point roller chair according to claim 1 is characterised in that the eccentric position of the lifting rollers (6) defining the value of the lifting of the blade (7) is limited in the roller holder (1) by the square bolts (5).

4. The point roller chair according to claim Hs characterised in that the blade (7) abuts on the surface of the roller holder (1) or on the surface of its lifting roller (6) through the replaceable fishplate (9) of the shackle (10), and a fishplate (9) has two oblique surfaces (12, 13) and a middle straight surface (14) created on its lower abutting side.

5. The point roller chair according to claim 4 is characterised in that the shackle (10) is attached to the flange (U) of the blade (7) and affixed using locking nuts (17, 18) and a adjusting bolt (19).