| 摘要 |
A railroad switch point indicator comprising a mounting plate mountable to a railroad switch point, a tubular housing mounted to the mounting plate, a piston slidably disposed in the housing and extendable to variably engage an associated railroad rail, a bias spring operatively connected to the piston for biasing the piston in an axial direction with respect to the housing and the railroad switch point, and a signal mechanism operatively connected to the piston for indicating the positional status of the switch point via an attitude of a signal flag. When the switch point is engaged with a rail, the flag is in a first attitude. When the switch point is disengaged from the rail, the flag is in a second attitude. When the switch point is positioned incorrectly, i.e., damaged, the flag may be in a third attitude intermediate between the first and second attitudes, indicating alarm. |
