Abstract: A paint mixing system includes a paint can lid having a mixing paddle that can be rotated by a power drill or the like. The paint mixing system is preferably constructed entirely of plastic (e.g. molded high density polyethylene), except for a self-lubricating washer. The paint mixing system includes a plastic lid having an integral bore, a coupler that is secured for rotation within the lid bore, and a mixing paddle attached to the coupler below the lid. The coupler has a cylindrical upper portion and a cylindrical lower portion that has a smaller diameter than the upper portion. Likewise, the integral bore has a cylindrical upper portion that is larger than a lower cylindrical portion. The coupler fits closely within the lid bore, but not snugly so that the coupler can rotate freely within the bore.

Abstract: A paint can cover or lid having a paint mixing device rotatably supported therefrom and extending into the interior of the paint can for mixing paint in the can while the cover or lid is in place to form a closure for the can. The mixer includes a paddle rotatably supported from the paint can cover or lid and a rotatable member which extends rotatably through the paint can cover or lid in a sealed manner to prevent leakage of paint and entrance of air with the outer end of the rotatable member having a polygonal socket receiving the output of a power device. In one embodiment of the invention, the paint can lid or cover is provided with an opening therein receiving an adapter secured to and sealed to the cover or lid by a threaded nut with the rotatable member extending through the adapter in sealed relation thereto.