| 摘要 |
<p>A logic circuit (51) is connected with detectors (52-58) which detect command signals input to a machine through controls for commanding a machine, and connected with a hydraulic lock switch (47) for locking the machine to stop it and unlocking it. The logic circuit (51) decides a method of locking the machine based on the signals from the detectors and switch. The logic circuit (51) is connected with a solenoid valve (41) for a hydraulic system to maintain the machine locked or unlock it. When the start command and the unlock command are both present, the logic circuit (51) maintains the machine locked until safety is assured. The machine can be unlocked by giving the unlock command after the lock command is issued while the start command is absent.</p> |
