Water closet ventilating unit

Claim 1

A TOILET VENTILATING ADAPTED FOR CONNECTION TO AN EXISTING TOILET BOWL, COMPRISING IN COMBINATION, (A) A HOLLOW HOUSING HAVING AN INLET THERETO PROXIMATE ITS UPPER END AND OUTLET CONDUIT LINE PROJECTING LATERALLY UPWARD THEREFROM PROXIMITE ITS LOWER END, SAID OUTLET LINE FORMING WITH SAID HOLLOW HOUSING A LIQUID SEALABLE TRAP STRUCTURE, (B) AN ELECTRICALLY ENERGIZABLE FAN DISPOSED SUBSTANTIALLY CENTRALLY ENTIRELY WITHIN AND SUPPORTED FROM THE WALLS OF SAID HOUSING WITH THE FAN BLADES DISPOSED FOR ROTATION IN A HORIZONTAL PLANE AND EFFECTIVE WHEN ENERGIZED TO MOVE GASES DOWNWARD FROM THE SAID HOUSING INLET TOWARD THE SAID HOUSING OUTLET, (C) A CYLINDRICAL PISTON WITHIN SAID HOUSING AXIALLY SHIFTABLE VERTICALLY UPWARD FROM A LOWER POSITION AT THE BOTTOM OF SAID HOUSING TO AN UPPER POSITION SPACED THEREABOVE, BY ENERGIZATION OF A SOLENOID CARRIED BY AND EXTENDING DOWNWARD FROM THE SAID FAN, SAID PISTON RETURNING TO ITS LOWER POSITION WHEN SAID SOLENOID IS DEENERGIZED, (D) A WELL FORMED IN THE BOTTOM OF SAID HOUSING CONTAINING A SUBSTANTIALLY FIXED VOLUME OF SAID TRAPSEALING LIQUID IN WHICH SAID PISTON IS IMMERSED ONLY WHEN IN ITS LOWER POSITION,. (E) OPERATING MEANS FOR SELECTIVELY RAISING SAID PISTON FREE OF THE WELL LIQUID FOR OPENING SAID TRAP STRUCTURE AND LOWERING SAID PISTON INTO SAID WELL LIQUID TO RAISE THE LEVEL THEREOF FOR CLOSING SAID TRAP STRUCTURE, (F) AN ANNULAR SEAL EXTENDING PERIPHERALLY ABOUT AND CARRIED BY SAID PISTON EFFECTIVE TO CLOSE THE GAS FLOW PATH BETWEEN SAID HOUSING INLET AND TRAP WHEN SAID PISTON IS AT ITS SAID LOWER POSITION BY ENGAGEMENT OF THE SEAL WITH THE INSIDE SURFACE OF THE HOUSING WALLS COMPLETELY PERIPHERALLY THEREABOUT TO THEREBY PREVENT ANY OF SAID TRAP SEALING LIQUID FROM BEING ASPIRATED INTO THE WASTE LINE WHEN THE TRAP IS CLOSED AND THE TOILET IS FLUSHED, SAID SEAL BEING DISENGAGED FROM THE HOUSING WALLS TO OPEN THE GAS FLOW PATH WHEN SAID PISTON IS AT ITS SAID UPPER POSITION, (G) AND SELECTIVELY OPERABLE CONTROL MEANS FOR SIMULTANEOUSLY ENERGIZING SAID FAN AND SOLENOID TO THEREBY WITHDRAW GASES FROM THE TOILET BOWL FOR DISCHARGING THE SAME THROUGH THE OPENED TRAP INTO THE WASTE LINE.