| 摘要 |
<p>The evacuation of foul smelling gases from the interior of a toilet bowl is effected by a fan which is driven by an electric motor and conveys the gases from the bowl through a control chamber in the flushing tank and into an evacuating conduit which is connected to the drain pipe. The motor is started in response to closing of a master switch which is distinct and preferably remote from an actuating knob which must be lifted or otherwise moved in order to enable a body of flushing liquid to flow from the tank into the bowl. A siphon is provided to permit liquid to flow from the interior of the control chamber into the interior of the flushing tank in response to rising pressure in the control chamber. Such pressure, which rises in response to starting of the motor, causes a lowering of the liquid level in a portion of the control chamber and a rise of the liquid level in another portion of the control chamber so as to establish in the siphon a continuous column of liquid which flows by gravity from the control chamber into the flushing tank so as not to waste the liquid which normally seals the inlet for gaseous fluid from the outlet for gaseous fluid in the control chamber.</p> |
