Pipe construction

Claim 1

AN IMPROVED SMOKING DEVICE COMPRISING A MEMBER FOR HOLDING AND BURNING A QUANTITY OF TOBACCO, SAID MEMBER BEING FORMED WITH A TUBULAR EXTENSION HAVING A CENTRAL PASSAGEWAY AND A RADIAL SLOT INTERSECTING SAID PASSAGEWAY, A PIPE STEM ELEMENT COMPRISING A CYLINDRICAL SLEEVE SECURED AT ITS INNER END TO THE TUBULAR EXTENSION, A MOUTHPIECE FORMED WITH A SMOKE PASSAGEWAY AND CONSTRUCTED WITH A REDUCED INNER END AND AN INTERMEDIATE SHOULDERED PORTION, SAID SHOULDERED PORTION BEING SNUGLY FITTED INTO THE PIPE STEM ELEMENT AT THE OUTER END THEREOF IN A POSITION SUCH THAT THE REDUCED INNER END OF THE MOUTHPIECE ELEMENT EXTENDS INTO THE PIPE STEM IN SPACED RELATION TO ITS INNER PERIPHERAL SURFACE, A HELICALLY COILED SPRING RECEIVED IN THE PIPE STEM AND ARRANGED TO HAVE HELICAL TURNS THEREOF ENGAGING THE REDUCED INNER END OF THE MOUTHPIECE, A RADIALLY COMPRESSIBLE ABSORBENT BODY HELD WITHIN THE HELICAL TURNS OF THE SPRING, SAID SPRING HAVING AN OUTER DIAMETER NORMALLY GREATER THAN THE INNER DIAMETER OF THE PIPE STEM MEMBER AND BEING RADIALLY COMPRESSED TO TIGHTLY ENGAGE WITH THE PIPE STEM AND THE REDUCED INNER END OF THE MOUTHPIECE TO DETACHABLY SECURE THESE PARTS TO ONE ANOTHER IN A MANNER SUCH THAT THEY MAY BE DISENGAGED BY TWISTING THE SPRING IN ONE DIRECTION ONLY, SAID ABSORBENT BODY BEING RADIALLY COMPRESSED AND HELD BY THE RADIALLY COMPRESSED SPRING AND COOPERATING WITH THE SPRING AND CYLINDRICAL STEM ELEMENT TO FORM A HELICAL DUCT ALONG WHICH SMOKE MAY TRAVEL, AND SAID HELICAL TURNS OF THE COMPRESSED SPRING BEING ADAPTED TO EXERT A PRESSURE RADIALLY OUTWARDLY AGAINST THE INNER PERIPHERAL SURFACE OF THE STEM MEMBER AND TO CONSTITUTE MEANS FOR SCRAPING AND CLEANING THE STEM ELEMENT WHEN THE COILED SPRING AND MOUTHPIECE ARE REMOVED THEREFROM, AND SAID RADIAL SLOT PROVIDING COMMUNICATION BETWEEN THE HELICAL DUCT AND THE MEMBER FOR HOLDING TOBACCO.