| 摘要 |
<p>An indicator mechanism is provided for an apparatus for correcting the existing grade and horizontal alignment of railroad track in accordance with a wire reference system. The mechanism includes frame means, the position of which in use is referenced to the existing position of an adjacent section of the railroad track. Pivot means are mounted on the frame means and a needle indicator is mounted on the pivot means so as to pivot about a horizontal axis generally parallel to a reference wire. A second indicator is mounted on the needle indicator for generally vertical, sliding movement thereon. A first index is arranged on the frame means to indicate in combination with the needle indicator the existing horizontal alignment of the adjacent section with reference to the reference wire. A second index in the form of a scale is arranged on the needle indicator and it indicates in combination with the second indicator the existing grade of the adjacent section of a track again with reference to the reference wire. During use of the mechanism, the positions of the needle indicator and the second indicator are adjusted by the reference wire in contact with the needle indicator and the second indicator. Preferably, the reference wire extends through an elongated slot in the bottom portion of the needle indicator, this slot extending vertically when the needle indicator is in a vertical position.</p> |
