Patent ID: 8434494

Claim:
A gravity type pipe providing enhanced cooling of smoke generated within the pipe, comprising: a movable assembly comprising a vertical conduit having a discharge port for discharging smoke generated within the gravity pipe, a bowl for receiving a combustible substance which is to be ignited to generate smoke, and an enlarged chamber disposed at the bottom of the vertical conduit which is in fluid communication with the vertical conduit, wherein the enlarged chamber has an open bottom end; a water reservoir which is dimensioned and configured to contain water and to enable the enlarged chamber of the movable assembly to be raised and lowered within the water contained within the enlarged chamber without exposing the open bottom end of the enlarged chamber to ambient air when the movable assembly is raised from a maximally submerged position within the water reservoir; the vertical conduit disposed in fluid communication with the enlarged chamber and projecting upwardly therefrom and comprises a mouthpiece which projects laterally from the vertical conduit; and a supplementary cooling chamber which is disposed to contain ice, to pass and smoke generated within the gravity pipe through the supplementary cooling chamber, and is interposed between the enlarged chamber and the discharge port of the vertical conduit and is disposed to fit into and is contained within the enlarged chamber in close cooperation therewith; wherein the enlarged chamber is configured to generate a partial vacuum when the movable assembly is raised while the open bottom end remaining submerged in the water; responsive to the partial vacuum, air and smoke generated in the bowl pass through the vertical conduit and enter the enlarged chamber.