| 摘要 |
An alignment system for use in aligning a first object with a second object, which system comprises a transmitter (6) for transmitting a directable signal, mounted on either the first object or the second object, a receiver (8, 9) for receiving the signal, mounted on the other of the first object or the second object and an indicator (12, 13) for indicating that a signal from the transmitter (6) has been received by the receiver (8, 9). Preferably, a single pair of transmitters (6) is mounted on a crane (7), a single pair of receivers (8) is mounted on a prime-mover (3) and a plurality of pairs of receivers (9) are mounted on a chassis (4) at intervals corresponding to positions midway along the lengths of each of a plurality of containers (2) supported by the chassis (4). Alignment of the transmitter (6) with the receiver (8) on the prime-mover (3) activates an indicator (12) for indicating that the movement of the prime-mover (3) is to be slowed. Alignment of the pair of transmitters (6) with one of the pair of receivers (9) on the chassis (5) activates an indicator (13) for indicating that the crane (7) is correctly aligned with a container (2) and that movement of the prime-mover (3) should, therefore, be stopped. The indicators (12, 13) and receivers (8, 9) form part of a control circuit (15). Also, a control circuit (15) for aligning a first object, such as a chassis (4) with a second object, such as a crane (7).
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