Pressurized plunger

Claim 1

A PRESSURIZED PLUNGER FOR CLEARING AN OBSTRUCTION FROM A PIPE THAT HAS AN EXPOSED, OPEN END COMMUNICATING WITH A RECEPTACLE, SAID RECEPTACLE HAVING WALLS ABUTTING SAID OPEN PIPE END, WHICH COMPRISES: (1) MEANS FOR SUPPORTING A CARTRIDGE OF COMPRESSED GAS, SAID CARTRIDGE HAVING AN OUTLET NECK TERMINATING IN A CLOSURE MEMBER; (2) A RESILIENT SEALING MEMBER ATTACHED TO THE CARTRIDGE SUPPORTING MEANS AND ADAPTED TO FIT SNUGLY AGAINST SAID ABUTTING RECEPTACLE WALLS TO FORM A SUBSTANTIALLY AIRTIGHT SEAL THEREWITH, SAID SEALING MEMBER HAVING AN ORIFICE THERETHROUGH; (3) AN AIR STREAM GUIDE MEMBER POSITIONED BETWEEN THE CARTRIDGE AND THE SEALING MEMBER, SAID AIR STREAM GUIDE MEMBER CARRYING MEANS FOR PUNCTURING SAID NECK CLOSURE OF THE CARTRIDGE TO PRODUCE AN OPENING OF RESTRICTED SIZE AND CAUSE A NARROW STREAM OF GAS TO ESCAPE THEREFROM, AND HAVING A NARROW ELONGATED PASSAGEWAY THERETHROUGH, SAID PASSAGEWAY HAVING AN INLET END AND AN OUTLET END, SAID INLET END BEING ADAPTED TO COMMUNICATE DIRECTLY WITH SAID RESTRICTED OPENING AFTER THE OPENING IS COMPLETELY FORMED BY ACTION OF THE PUNCTURING MEANS, AND SAID OUTLET END COMMUNICATING WITH THE ORIFICE OF THE SEALING MEMBER; (4) MEANS CARRIED BY THE CARTRIDGE SUPPORTING MEANS AND THE SEALING MEMBER FOR BRINGING THE CARTRIDGE AND THE PUNCTURING MEANS INTO OPERATIVE ENGAGEMENT AND (5) RESILIENT MEANS FOR CONFINING IN A SPACE NO LARGER IN CROSS-SECTION THAN THE EXTERNAL CROSS-SECTIONAL AREA OF SAID PUNCTURING MEANS, FOR ANY PERIOD OF TIME DURING WHICH THE PUNCTURING MEANS HAS NOT YET FULLY PIERCED SAID NECK CLOSURE, THE STREAM OF GAS FROM THE PUNCTURED CARTRIDGE, AND FOR INTRODUCING SAID STREAM OF GAS DIRECTLY INTO THE INLET END OF THE AIR STREAM GUIDE MEMBER PASSAGEWAY.