Vacuum cleaner

Claim 1

A VACUUM CLEANER COMPRISING: (A) A CASING HAVING AN AIR INLET OPENING: (B) AN ELECTRIC MOTOR AND SUCTION FAN MOUNTED WITHIN SAID CASING FOR CAUSING SUCTION AIR TO FLOW INTO SAID CASING THROUGH SAID AIR INLET OPENING; (C) A FILTER POSITIONED WITHIN SAID CASING BETWEEN SAID AIR INLET OPENING AND SAID SUCTION FAN; (D) EXHAUST AIR PASSAGE MEANS WITHIN SAID CASING, SAID EXHAUST AIR PASSAGE MEANS BEING POSITIONED ADJACENT TO SAID SUCTION FAN TO RECEIVE AIR WHICH IS EXHAUSTED FROM SAID SUCTION FAN; (E) SAID CASING INCLUDING A BASE MEMBER HAVING A GENERALLY FLAT HORIZONTAL BOTTOM WALL HAVING AN OUTLET OPENING THEREIN; A VERTICAL END WALL EXTENDING UPWARDLY FROM SAID BOTTOM WALL, AN OPENING FORMED IN SAID END WALL; (F) A MUFFLER MEMBER HAVING A GENERALLY FLAT TOP WALL AND DEPENDING SIDE WALL MEANS, SAID MUFFLER MEMBER BEING POSITIONED ON TOP OF THE BOTTOM WALL OF SAID BASE MEMBER TO FORM A MUFFLER CHAMBER BETWEEN THE TOP WALL OF SAID MUFFLER MEMBER, THE SIDE WALL MEANS OF SAID MUFFLER MEMBER, SAND SAID GENERALLY HORIZONTAL FLAT BOTTOM WALL; (G) AND MUFFLER MEMBER ALSO BEING FORMED WITH A CURVED TOP WALL PORTION, SAID CURVED TOP WALL BEING GENERALLY ALIGNED WITH THE OPENING FORMED IN SAID END WALL; (H) SAID MUFFLER MEMBER FORMING PART OF THE LOWER WALL OF SAID EXHAUST AIR PASSAGE MEANS, AND BEING PROVIDED WITH OPENING MEANS FORMED IN ITS CURVED TOP WALL PORTION FOR PERMITTING EXHAUST AIR FROM SAID EXHAUST AIR PASSAGE MEANS TO ENTER SAID MUFFLER CHAMBER; AND (I) TUBULAR COUPLING MEANS SELECTIVELY INSERTABLE THROUGH THE OPENING IN SAID END WALL AND POSITION ABLE ON TOP OF SAID CURVED TOP WALL PORTION OF SAID MUFFLER MEMBER FOR COVERING SAID OPENING MEANS THEREBY PREVENTING EXHAUST AIR FROM ENTERING SAID MUFFLER CHAMBER.