Patent ID: 8286836

Claim:
A dispensing tube assembly comprising: a post mix chamber; a first component delivery tube having a proximal end near a pumping portion of a first component delivery pump, the pumping portion including components that form a chamber that is reduced in volume, and a distal end located away from the pumping portion of the first component delivery pump, the first component delivery tube providing an axial passage defining an axial flow path to advance a first component in a flow direction toward said post mix chamber from a first component source; a second component delivery tube having a proximal end near a pumping portion of a second component delivery pump, and a distal end located away from the pumping portion of the second component delivery pump, the second component delivery tube surrounding said first component delivery tube to create an annular passage defining an annular flow path to advance a second component in said flow direction toward said post mix chamber from a second component source; a rigid axial path end plate blocking said axial flow path; a premix aperture extending from said axial flow path to said annular flow path, proximate said axial path end plate; a post mix aperture extending from said annular flow path to said post mix chamber, wherein, along said flow direction, said post mix aperture is positioned downstream of said premix aperture; an annular premix chamber defined in said annular flow path between said premix aperture and said post mix aperture; and an annular flow path end plate blocking said annular flow path proximate said post mix aperture, wherein a first component advanced along said axial flow path toward said post mix chamber exits said axial flow path at said premix aperture and enters said annular premix chamber due to the blocking of the axial flow path by said axial path end plate, and a second component advanced along said annular flow path toward said post mix chamber mixes with said first component entering said annular premix chamber to form a premixture that exits said annular flow path at said post mix aperture and enters said post mix chamber due to the blocking of the axial flow path by said annular flow path end plate; and a mix media located downstream of the post mix aperture and proximate the post mix chamber.