These anodised light alloy laundry trolleys have a mobile bottom that raises or lowers gradually and automatically according to the load put inside or taken out. The mobile bottom is operated by a galvanized harmonic steel spring, set in proportion to the weight and the volume of the load so it stays in horizontal position even when the load is not uniformly distributed thanks to a pantograph made of galvanised steel. When the bottom reaches the dead center, the spring has reached maximum load capacity and no further lowering is allowed.
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