Abstract: A single retainer retains two sets of circumferentially separated rollers. The retainer is made from flat metal stock. The retainer includes a pair of axially separated end rings interconnected by circumferentially separated axially extending cross-bars, and an axially centered ring. The axially centered ring may be an integral center ring or a separate metal band which has been attached to the cross-bars by methods such as welding.

Abstract: A rotary storage structure (10) has a supporting frame (12) provided with circular tracks (29, 35) provided with rollers (31) which support independently rotatable sub-frames (15, 16). Each sub-frame (15, 16) is provided with pairs of co-axial rings (36) which support self-righting storage platforms (37) for items (e.g. motor vehicles) loaded into, or from, the structure (10) from loading platforms or ramps (44). A cable drive (42) is provided to rotate each sub-frame (15, 16) to enable the storage platforms (37) to be positioned adjacent the loading platforms or ramps (44).