US Patent 6869564 Molten metal pump system

A molten metal pump system which generally provides a refractory connection joint for connecting a refractory pump post to a pump base, the pump post including a refractory post with a first end, the first end including an internal joint peg aperture; a refractory base with a post aperture configured to receive the first end of the refractory post, and with a peg aperture contiguous with the post aperture; and a joint peg with a first end and a second end, the joint peg including a retention shoulder, the joint peg configured to insert through the peg aperture in the refractory base with a retention bar or bolt inserted through an aperture in the joint peg of refractory post, and the retention shoulder engaging the refractory base.