| 摘要 |
<p>The inventive structure comprises longitudinal members and cross members which are disposed at different levels, into which pallets can be inserted, said pallets being supported on pairs of carriages which can move along corresponding fixed tracks belonging to the structure. According to the invention, the initial end of each carriage is equipped with a trigger having a first end which can project out from the upper part of the carriage through an opening provided in same and a second end which can be housed in an opening in the fixed track. The trigger rotates around a shaft which is mounted transversely inside the carriage and which intersects with the trigger at a point that is closer to the first end than the second thereof. When there are no pallets on the carriage, the second end remains inside the opening in the track under its own weight, thereby blocking the movement of the carriage in relation to the track, and the assembly is released by resting a pallet on the first end of the trigger projecting out from the carriage.</p> |
