Patent ID: 6062608
Filing Date: 2000-05-16
Classification: F16L,F23J,F23L

Abstract:
A coaxial pipe assembly for a direct vent fireplace coaxial flue-system, the assembly comprising:a first hollow tube defining an outer diameter and defining an axis concentric to the hollow tube, the hollow tube having a first section and a second section, the first section having a male connector defining an outer diameter and the second section having a female connector defining an inner diameter that is greater than the outer diameter of the male connector;a second hollow tube disposed about the first hollow tube and defining an outer diameter that is greater than the outer diameter of the first hollow tube and defining an axis concentric to the first hollow tube, the second hollow tube having a first section and a second section, the first section having a male connector and the second section having a female connector,the male connector of the second hollow tube having a first termination end and an outer stop bead,the first termination end having a locking ridge, the locking ridge extending radially outwards from the axis of the second hollow tube to define an outer diameter that is greater than the outer diameter of the second hollow tube,the outer stop bead extending radially outward from the axis of the second hollow tube and disposed in proximity to the locking ridge,the female connector of the second hollow tube having a second termination end and a plurality of lances,the plurality of lances disposed at equal distances from the second termination end and extending radially inward towards the axis of the second hollow tube to define an inner diameter such that the inner diameter defined by the plurality of lances is less than the outer diameter of the locking ridge;a means for retaining the second hollow tube about the first hollow tube,wherein the female connector of the second hollow tube further comprises a stiffening bead and a stiffening jog,the stiffening bead extending radially outward from the axis of the second hollow tube and disposed in proximity to the second termination end, such that the stiffening bead resides between the plurality of lances and the second termination end, and further whereinthe stiffening jog extends radially inward from the axis of the second hollow tube and disposed in proximity to the plurality of lances such that the plurality of lances resides between the stiffening jog and the stiffening bead.