Patent ID: 8490629

Claim:
A pipe comprising: an elongate chamber having an inhalation port at a proximal end suited to fit over a user's mouth; a smoke expansion chamber extending away from the inhalation port; a purge carburetor extending from a distal end of the elongate chamber; said purge carburetor having an extendable valve head that seals an annular inlet in a passive mode and opens the annular inlet in an inhalation mode; a smoke injection shaft affixed to the extendable valve head; said annular inlet further comprising a plurality of elongate bores arranged in a circular pattern around the smoke injection shaft, said extendable valve head having a burn bowl feeding into the smoke injection shaft that protrudes into the smoke expansion chamber; wherein burning a material in the burn bowl while the user provides inhalation pressure over the inhalation port in the passive mode injects smoke from the burn bowl through the smoke injection shaft and into the smoke expansion chamber; wherein extending the extendable valve head along with the smoke injection shaft, for the inhalation mode opens the annular inlet allowing ambient air to rush into the smoke expansion chamber and force the smoke into the user's mouth; and wherein a spring biases the extendable valve head back to the passive mode.