Carrying device with sliders and rail

A carrying device comprising:

• (a) a guide rail comprising a head, a base and a web disposed intermediate to said head and said base;
• and
• (b) at least one slider to run along said rail to carry a load in a longitudinal direction of said rail, said at least one slider having a plurality of substantially U-shaped thin members layered in said longitudinal direction of said rail to form a substantially channel-shaped casing with an outer periphery, an inner periphery and a slit through which said inner periphery and said outer periphery communicate with each other, said inner periphery of said casing defining a central aperture in said casing, said inner periphery having a plurality of radiately extending recesses extending radiately from said inner periphery, said at least one slider having a plurality of rollers, each roller being disposed in a respective one of said radiately extending recesses and being adapted to rotate freely in said longitudinal direction of said rail in relation to said casing, said head and web of said rail being loosely inserted through said central aperture and slit of said casing respectively, said rail head being in an engaging relation to said casing central aperture, said rollers being adapted to make freely rolling contact with said rail head.