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Patent Searching and Data


Title:
SYSTEM FOR CONNECTING RUBBER PANELS FOR A RUBBER RAILROAD CROSSING
Document Type and Number:
WIPO Patent Application WO/2017/208036
Kind Code:
A1
Abstract:
The application is applied in the cases when the railway line and asphalt road cross at the same level, and the crossing has rubber panels (6) which need to be connected to each other. The steel cable (2) and the system of its tensioning ensure the necessary axial tensile force, and, due to its elasticity, the cable Is resistant to permanent deformation caused by the heavy vehicles going over the railroad crossing. The rubber panels and other parts of the system enable the vehicles to go over the railway line quietly and without large vibrations. Furthermore, the flexible cable enables the railway company to dismantle the crossing easily and install it back in the same place after completing the overhaul of the railway line.

Inventors:
RAJIC, Slobodan (Karela Zahradnika 26, 1000 Zagreb, HR)
Application Number:
HR2016/000022
Publication Date:
December 07, 2017
Filing Date:
September 29, 2016
Export Citation:
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Assignee:
RAJIC, Slobodan (Karela Zahradnika 26, 1000 Zagreb, HR)
International Classes:
E01C9/04
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Claims:
PATENT CLAIMS

1. The system for connecting rubber panels for a rubber railroad crossing, characterized by the rubber panels being connected with a cable (2) which is pulled through the rubber panels (6). The cable (2) has a bolt (3) with a nut (10) on one end and a clamp bushing (5) on the other. The axial force for the connection of the panels is realized using a hydraulic tensioning device (7) and a mounting bushing (8) and by means of the bolt (3) and a nut (10).

2. The system for connecting rubber panels for a rubber railway crossing in accordance with the claim 1, characterized by the hydraulic tensioning device (7) consisting of a double acting piston (11) and a longer piston rod of the hydraulic cylinder (12), with the piston (11) pushing the mounting bushing (8) with the piston rod (13) and the longer piston rod of the hydraulic cylinder (12) containing, on its inner side, the retainer ring (17) holding the clamp bushing (5).

3. The system for connecting rubber panels for a rubber railroad crossing in accordance with the claim 1, characterized by the mounting bushing (8) containing three semicircular cone keys (15).

4. The system for connecting rubber panels for a rubber railroad crossing in accordance with the claim 1, characterized by the clamp bushing (5) containing three semicircular cone keys (16).

Description:
SYSTEM FOR CONNECTING RUBBER PANELS FOR A RUBBER RAILROAD CROSSING

FIELDWHICH THE INVENTION RELATES TO

This invention (the System for Connecting Rubber Panels for a Rubber Railroad Crossing) relates to the method of fixing the rubber panels at rubber railroad crossings. Rubber crossings are used on the crossing of a railway line and the road at the same level as defined according to the International Patent Classification (IPC) in the technical field B under B61L

TECHNICAL PROBLEM (the solution to which the patent application is submitted for)

The technical problem is connecting the rubber panels used at rubber railroad crossings when the crossing of the road and the railway line is at the same level, in a manner which meets the following requirements: a) Ensuring the necessary axial force for the connection;,

b) The possibility of dismantling the system and installing it again for the purpose of railway line overhaul;

c) Withstanding the stress caused by the vehicles going over the rubber panels, with no permanent (plastic) deformations;

d) The possibility of subsequent tensioning after a certain period of exploitation.

STATE OF THE ART (review and analysis of known solutions to the defined technical problem)

Steel bolts are used today and they are added one to another so that their total length would fit the width of the railroad crossing as shown in figure (1). After being used for years, the bolts (1) are permanently deformed, so, when dismantling, there is a problem of pulling them out from the rubber panels.

DESCRIPTION OF THE INVENTION (enabling the understanding of the technical problem and its solution, and stating the technical novelty of the invention in relation to the previous state of the art)

A steel cable is used instead of steel bolts (1), figure 1. It ensures the elasticity of the connection system and therefore the absence of permanent (plastic) deformations that are present with steel bolts. Before installation, the cable (2) figure 2, is cut to the required size by way of determining it slength in accordance with the width of the railroad crossing„A". A bolt (3) is mounted at one end using the technology of pressing its head (4) onto the cable (2). After the cable (2) is pulled through the rubber panels (6) shown in figure 1, a washer (9) and a nut (10) are placed on the bolt (3). A clamp bushing (5) is placed on the other end of the cable. After the clamp bushing (5), a hydraulic cylinder (7), figure 2,is placed on the cable. After the hydraulic cylinder (7), a mounting bushing (8) is placed on the cable.

Hydraulic oil is pumped into the opening "B" of the cylinder (7), figure (2) using a manual hydraulic pump. At the same time, oil from the other side of the double acting piston (11) returns through the opening "D" on the cylinder (7) to the tank of the manual high pressure hydraulic pump. That causes moving of the double acting piston (11) in relation to the hydraulic cylinder body (7). Since the hydraulic cylinder, with its longer piston rod (12),rests on the washer (14), and through the washer on the set of rubber panels, and with its piston rod (13) on the mounting bushing (8), the cable will be tensioned. (2). That is achieved by means of three semicircular cone keys (15) which are, on their outer side, keyed into the conical body of the mounting bushing (8), and, on their inner side, on the cable (2). The more the double acting piston (11) moves in the direction of the mounting bushing (8) the more tensioned is the cable (2). When the necessary tensile force is achieved (which is controlled through the pressure of the hydraulic fluid), the pressure is reduced, i.e. the direction of pumping of the fluid is changed so that the oil from the hydraulic cylinder (7) returns through the opening "B" into the hydraulic pump tank. At that time, the tensile force on the cable (2) weakens so the cable moves in the direction of the rubber panels (6) and pulls the three semicircular cone keys (16), figure 3, out of the bushing (5). The three semicircular cone keys (16) slide on the cone opening in the clamp bushing body (5) and key into the cable thus permanently achieving the tensile force of the cable (2). There is a retainer ring (17) on the inner side preventing the clamp bushing (5) from moving on the longer piston rod of the hydraulic cylinder (12) together with the cable (2) during tensioning.

After achieving the tensile force, the mounting bushing (8) and the hydraulic cylinder (7) are removed from the cable (2).

If, after a certain period, it is necessary to additionally tension the cable, it is performed without the hydraulic tensioning device, by means of the bolt (3) and the nut (10). When the railroad crossing is overhauled, the cable is removed from the rubber panels (6), figure (1) by unscrewing the nut (10) on the bolt (3) first.

BRIEF DESCRIPTION OF DRAWINGS The drawings which are included in the description and which are the part of the invention description, illustrate the discussed and the best way for the construction of the invention, and assist in explaining the basic principles of the invention.

Figure 1. Illustration of a rubber railroad crossing;

Figure 2. Illustration of a hydraulic cylinder;

Figure 3. Illustration of a hydraulic cylinder with the cable and tensioning bushings; Detailed description of at least one of the modes for carrying out of the invention

The system for connecting rubber panels for a rubber railroad crossing can be used in solving the technical problem occurring in the usage of the stated crossing, and is primarily developed in order to be used in the exploitation of HR P2012099 A2 patent.

List of the designations used

1) Bolts;

2} Cable;

3) Bolt;

4) Bolt head;

5) Clamp bushing;

6) Rubber panel;

7) Hydraulic tensioning device (cylinder);

8) Mounting bushing;

9) Washer;

10) Nut;

11) Hydraulic cylinder piston;

12) Longer piston rod of the hydraulic cylinder;

13) Hydraulic cylinder piston rod; 90 14) Washer;

15) Three semicircular cone keys of the mounting bushing;

16) Three semicircular cone keys of the clamp bushing;

17) Hydraulic cylinder retainer ring;

A" Railroad crossing width;

95 B" Oil inlet on the hydraulic cylinder;

„D"Oil outlet on the hydraulic cylinder. MODE FOR CARRYING OUT OF THE INVENTION

The invention is used in the cases when the railway line and asphalt road cross at the same level, and the crossing has rubber panels that need to be connected to each other. The steel

100 cable and the system for its tensioning ensure the necessary axial tensile force, and due to its elasticity, it is resistant to permanent deformation caused by the heavy vehicles going over the railroad crossing. The rubber panel and other parts of the system enable the vehicles to cross the railroad quietly and without large vibrations. Furthermore, the flexible cable enables the railway company to dismantle the crossing easily and install it again in the

105 same place after completing the railway line overhaul.