Abstract: A shelf and a shelving system thereof. The shelf comprises a shelf main body having a top surface and a bottom surface; wherein, the shelf main body has one or more strip-shaped recesses on the top surface of the shelf main body; at least one of the two sidewalls has two or more first opening regions arranged longitudinally along the sidewall, and at least one of the two or more first opening regions is adjacent to the bottom wall of the recess. The first opening regions on the sidewalls of the recesses of the shelf main body can be used as water drain ports for draining water accumulated in the strip-shaped recesses. On the other hand, due to the first opening regions, the material cost is saved, and the weight of the shelf and shelving system become lighter, thereby facilitating transportation and storage.

Abstract: The present invention discloses a folding cart, which comprises a left frame, a right frame, plurality of platforms, a left connecting rod, a right connecting rod, a guide rod, a sliding sleeve, a pressing member, a moving block and an elastic member. The sliding sleeve, disposed on the guide rod and slidable up and down relative to the guide rod, has a limiting hole opposite to the second opening of the guide rod. The pressing member has a first slope. The moving block has a second slope and a limiting protrusion. By the slope sliding between the pressing member and the moving block and the sliding of the sliding sleeve along the guide rod, the sliding is smooth, with low friction. Therefore, not too much force is required and the operation is thus easier.

Abstract: The present invention discloses a folding cart, which comprises a left frame, a right frame, plurality of platforms, a left connecting rod, a right connecting rod, a guide rod, a sliding sleeve, a pressing member, a moving block and an elastic member. The sliding sleeve, disposed on the guide rod and slidable up and down relative to the guide rod, has a limiting hole opposite to the second opening of the guide rod. The pressing member has a first slope. The moving block has a second slope and a limiting protrusion. By the slope sliding between the pressing member and the moving block and the sliding of the sliding sleeve along the guide rod, the sliding is smooth, with low friction. Therefore, not too much force is required and the operation is thus easier.