| 摘要 |
A safety lock apparatus 30 for a railway point arrangement 16 comprises a pair of stock rails 20 and a pair of switch rails 18a, 18b located between the stock rails 20 and movable simultaneously by an actuator arrangement 24. Each switch rail is movable transversely between a closed position in contact with one of the stock rails and an open position spaced from the stock rail. The safety lock apparatus 30 further comprises a blocking member 32a, 32b which is connected to the actuator arrangement and movable by the actuator arrangement between an active position in which the blocking member is positioned in a gap between an open switch rail and an adjacent stock rail and an inactive position in which the blocking member is positioned outside the gap. When the blocking member is in the active position, it prevents transverse movement of the switch rail from the open position to the closed position. When the blocking member is in the inactive position, it permits transverse movement of the switch rail from the open position to the closed position. |
