Mud mixing machine with lifting coupler

An apparatus for mixing premixed joint compound and water to form a joint compound mixture, comprising:

• container means for containing the premixed joint compound and water as they are mixed to form the joint compound mixture, including a container having an interior extending along a central axis of the container from a base portion of the container to an upper lip portion of the container;
• pumping means for pumping the joint compound mixture from the container to at least one outlet, including a motor driven pump assembly in fluid communication with the interior of the container and the outlet;
• mixing element means for mixing the premixed joint compound and water in the container, including a mixing element within the interior of the container that is adapted to fit within the interior of the container, to be rotated about the central axis of the container for mixing purposes, and to rest upon the base portion of the container during periods that the mixing element is not being rotated;
• mixing element driver means for rotating the mixing element within the container, including a driver assembly with a motor driven drive shaft, which driver assembly includes a cover component that is adapted to rest atop the lip portion of the container with the drive shaft extending along the central axis of the container to the mixing element;
• coupling means for removably coupling the drive shaft to the mixing element, including a coupling adapted to engage and raise the mixing element above the base portion of the container slightly when the drive shaft rotates, said coupling including a first coupling component connected to the drive shaft and a second coupling component connected to the mixing element, which first coupling component is adapted to removably engage the second coupling component when rotated in order to rotate the mixing element while raising the mixing element slightly above the base portion of the container;
• and
• dolly means for portably supporting the container means, pumping means, mixing element means, mixing element driver means, and coupling, said dolly means including a handle defining a slot that is shaped and dimensioned to receive a portion of the cover component in order to function as means for holding the driver assembly in a position raised above the upper lip portion of the container.