Shaking machine adaptor for containers having different shapes

An adaptor for holding a container having a predetermined width in a bucket of a mixing device, the adaptor having a central longitudinal axis and comprising:

• a pair of holding structures connected together for pivotal movement relative to each other along a pivot axis parallel to and spaced from the longitudinal axis, the movement being between an open position and a closed position, the holding structures each having a plurality of interior surfaces defining an inner depression, the inner depressions include a plurality of edges along axes parallel to and spaced from the longitudinal axis, the interior surfaces including first and second lower support surfaces disposed in planes perpendicular to the longitudinal axis, the first lower support surface being disposed at a different elevation than the second lower support surface, and the interior surfaces including first and second upper support surfaces disposed in planes perpendicular to the longitudinal axis, the first upper support surface being disposed at a different elevation than the second upper support surface;
• wherein when the holding structures are in the closed position, the inner depressions cooperate to define a cavity having a first region at least partially defined by the first lower support surface and a second region at least partially defined by the second lower support surface, the first region being adapted to hold the container when the container has a body with a circular cross-section and the second region being adapted to hold the container when the container has a substantially rectangular cross-section;
• and
• wherein when the adaptor is holding the container and the holding structures are in the closed position, the container is supported on the first lower support surfaces when the container has a circular cross-section, and is supported on the second lower support surfaces when the container has a body with a substantially rectangular cross-section, and the edges of the inner depressions contact the substantial length of the container.