| 摘要 |
<p>PURPOSE:To prevent erroneous operation, by providing a signal transmitting and receiving means for transmitting a cargo distributor drive inhibiting signal from the crane side to the cargo distributor side so that the signal is continuously transmitted during a cargo shifting means on the crane is driven but it is made to disappear when the cargo shifting means is at its stand-by position. CONSTITUTION:A photo-projector for a cargo receiving bed movement inhibiting signal on the crane side delivers the signal continuously during a crane fork is located at the center position, that is, during it is extended. This signal is composed of a rise part 21a including two pulse signals, and a release signal part 21b having one pulse signal just after falling. Accordingly, the projector transmits the cargo receiving bed movement inhibiting signal in association with the initiation of extending and retracting movement of the fork 2, and the transmitted signal is received so that a drive means on a cargo receiving bed is interlocked. A control devices discriminates where thus received signal contains the rise part 21a including the two pulse signals or not to confirm the inhibiting signal.</p> |
