Claims
- 1. An arrangement for operating a rail switch having a mechanical switching device, said arrangement including a plurality of interlinked hydraulic switching devices separated in the longitudinal direction of the rails and each comprising a hydraulic cylinder/piston unit, at least one of said hydraulic switching devices being directly connected with the mechanical switching device, said units each having cylindrical volumes defined by the cylinder and the piston of the respective unit, said volumes of respective units being hydraulically interconnected whereby when a piston of one of said units is displaced relative to its cylinder in response to displacement of the mechanical switching device, thereby pumping fluid from one of the unit's cylindrical volumes in accordance with the piston's displacement, the pistons of the remaining units are displaced in the same direction.
- 2. A rail switch operating arrangement as set forth in claim 1, wherein each of the hydraulic cylinder/piston units has two cylindrical volumes located adjacent opposite surfaces of the piston, said surfaces having substantially identical areas.
- 3. A rail switch operating arrangement as set forth in claim 2, further comprising a sliding block operatively joined to the mechanical switching device and to the piston of each hydraulic switching device which is connected with the mechanical switching device.
- 4. A rail switch operating arrangement as set forth in claim 2, wherein the piston of at least one of the hydraulic switching devices is rigidly connected with a continuous piston rod passing through seals at opposite ends of the cylinder, and wherein one of piston rod or its associated cylinder is fixed when the said one cylinder and its piston are displaced relative to one another.
- 5. A rail switch operating arrangement as set forth in any one of claims 1 to 4, wherein the cylindrical volumes of the hydraulic cylinder/piston units are connected with a pressure reservoir via overpressure valves.
- 6. A rail switch operating arrangement as set forth in claim 5, wherein said overpressure valves are nonreturn valves which may be triggered.
- 7. A rail switch operating arrangement as set forth in any one of claims 1 to 4, wherein the hydraulic interconnection between cylindrical volumes of respective units includes at least one pressure-controlled directional control valve which closes when the pressure of hydraulic fluid pumped from one of the cylindrical volumes falls below a predetermined value.
- 8. A rail switch operating arrangement as set forth in claim 2, herein said opposite surfaces of the piston are joined by a bore passing through the piston, said arrangement further comprising at least one push-open valve located within the bore.
- 9. A rail switch operating arrangement as set forth in claim 5, wherein the hydraulic interconnection between cylindrical volumes of respective units further includes at least one pressure-controlled directional control valve which closes when the pressure of hydraulic fluid pumped from one of the cylindrical volumes falls below a predetermined value.
Priority Claims (2)
Number |
Date |
Country |
Kind |
140/94 |
Jun 1994 |
ATX |
|
758/95 |
May 1995 |
ATX |
|
Parent Case Info
This application claims benefit of International application PCT/AT95/00125, filed Jun. 21, 1995.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/AT95/00125 |
6/21/1995 |
|
|
2/23/1996 |
2/23/1996 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO96/00160 |
1/4/1996 |
|
|
US Referenced Citations (4)
Foreign Referenced Citations (7)
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586627 |
Sep 1924 |
FRX |
2 196 619 |
Mar 1974 |
FRX |
2 280 537 |
Feb 1976 |
FRX |
1005112 |
Jan 1955 |
DEX |
1105450 |
Apr 1961 |
DEX |
2 144 564 |
Mar 1973 |
DEX |
28 17 782 |
Oct 1979 |
DEX |