Claims
- 1. In a tamping head for tamping ballast underneath a track including rails supported on a plurality of spaced ties resting on the ballast and defining cribs therebetween, which comprises a pair of tamping tools, a vertically adjustable carrier whereon the tamping tools are mounted for immersion in the ballast in the cribs adjacent respective ones of the ties, the ties being positioned between the tamping tools, each tamping tool being constituted by a lever pivotal in a substantially vertical plane extending in the direction of the track about a horizontal pivot extending substantially transversely to the track direction, power drive means for reciprocating the tamping tools about the pivots thereof and for vibrating the tamping tools, stop means associated with one of the tamping tools for positioning the pivot of the one tamping tool in at least three different fixed positions with respect to the pivot of the other tamping tool of the pair in the track direction, and a remote control for operating the stop means to move the stop means into a selected one of the fixed positions whereby the distance between the pivots of the tamping tools of the pair is changed without changing the stroke of the reciprocating power drive means, the stop means including a multi-step drive operated by the remote control for setting the stop means at the selected position.
- 2. In the tamping head of claim 1, the stop means comprising a two-armed lever mounted on the tamping tool carrier and having one end linked to the pivot of the one tamping tool, and a guide extending in the track direction and mounting the lever for movement therealong, the multi-step drive being arranged to control the movement of the lever along the guide into the selected position.
- 3. In the tamping head of claim 2, the pair of tamping tools comprising tamping tools arranged for immersion in the ballast adjacent both sides of each rail, each group of tamping tools adjacent both sides of each rail being reciprocable about a common pivot, and the one end of the two-armed lever being linked to the common pivots.
- 4. In the tamping head of claim 2, each tamping tool including a tool holder and the pivot being positioned substantially equidistantly from the ends of the tamping tool holders intermediate thereof.
- 5. In the tamping head of claim 1, the multi-step drive being a hydraulically operated four-step cylinder-and-piston device.
- 6. In the tamping head of claim 5, the cylinder-and-piston device comprising a stationary main piston, two auxiliary pistons associated therewith, and a cylinder common to the pistons.
- 7. In the tamping head of claim 1, mounted on a mobile track tamper comprising an operating station, the remote control being arranged at the station for independently actuating the multi-step drive for each tamping tool.
- 8. In the tamping head of claim 1, two of said pairs of tamping tools spaced from each other in the track direction, the spacing between the pairs of tamping tools being such that the tools of each pair, which are adjacent to each other, are immersible in one of the cribs whereby two adjacent ones of the ties are respectively positioned between the adjacent tools of the pairs and the outer tools of the pairs, a respective one of the multi-step drives being linked to the pivot of the outer tamping tool of each pair.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7101/75 |
Sep 1975 |
ATX |
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Parent Case Info
This is a continuation of application Ser. No. 707,946, filed July 23, 1976, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2055489 |
May 1971 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
707946 |
Jul 1976 |
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