Abstract: Shaker apparatus for containers having paint mixtures therein includes a housing, U-shaped holder frame means supported in the housing, and clamping disks for detachably securing containers in the holder frame means. The U-shaped holder frames are mounted for rotation on power driven shaft means horizontally received in the housing. Drive means responsive to rotation of the U-shaped holder frame members about a horizontal axis is operable to turn the clamping disks about axes perpendicular to the said horizontal axis. The drive means includes rotatable sheave means having endless belts which are engageable with stationary sheave means. The stationary sheave means are fixed to the power driven shaft means and located in coaxial relationship therearound.