Refillable dispensing apparatus

Apparatus for dispensing liquid in a measured amount into water contained in a toilet tank upon toilet flushing comprising:

• a bottle having a first opening at one end thereof and a second opening at the other end thereof;
• selectively removable closing means normally closing each opening prior to installation of said bottle in said tank so as to hold liquid in the bottle;
• means for mounting said bottle within the tank so that the bottle normally is partially submerged in the tank water with the first opening normally submerged and the second opening above the tank water level;
• a valve assembly disposed in said first opening and fixed to said bottle, said valve assembly having
• (a) a first member which is fixed to the first opening so as to extend within the bottle, said fixed member having
• (i) an inlet disposed within the bottle to provide a passage for the liquid contained in the bottle into a reservoir formed in the fixed member, said reservoir being below the inlet when the bottle is mounted in the tank and
• (ii) an outlet formed in the fixed member so as to be below the reservoir when the bottle is mounted in the tank, said inlet, reservoir and outlet being generally axially aligned with one another to provide a passage for the bottle liquid through the fixed member;
• and
• (b) a second member which is movable and is disposed within the fixed member bottle liquid passage;
• first valve means formed by said fixed member and said movable member between the reservoir and inlet, said first valve means having a first valve seat formed in the fixed member and a first valve head formed on the movable member so as to seal the bottle liquid passage when seated on the first valve seat;
• second valve means formed by said fixed member and said movable member in said bottle liquid passage downstream from the reservoir, said second valve means having a second valve seat formed in the fixed member and a second valve head formed on the movable member and disposed thereon so as to seal the bottle liquid passage when seated on the second valve seat;
• said first and second valve heads being connected together by a valve stem portion of the movable member which extends through the reservoir and disposed on said stem so as to face in opposite directions relative to one another;
• a float mounted on the movable member so as to be disposed external of the fixed member outlet and operable, when the bottle is mounted in the tank so as to be partially submerged and the closing means are removed from the first and second openings, to raise and lower the valve stem portion in response to filling and emptying, respectively, of the tank so that, when said tank is full of water, one of said valve means closes and seals the bottle liquid passage and when the tank is empty, the other of said valve means closes and seals the bottle liquid passage;
• and in which
• (a) the inlet has a minimum cross-sectional area open to bottle liquid flow which is less than the minimum cross-sectional area open to bottle liquid flow within the fixed member downstream from the one of said valve means which is closed when the tank is empty whereby, when said closed valve means opens in response to upward movement of float during tank filling, the downward fluid pressure on the valve head thereof rapidly decreases, so that, in response to the upward pressure of the float, the valve stem portion moves upwardly at a much greater rate than the rate of water level rise in the tank, thereby rapidly closing the other of said valve means;
• (b) the bottle has a top in which the first opening is formed and a bottom which has a recessed portion in which the second opening is formed and second opening closing means extends downwardly from said second opening so as to terminate in a surface which is generally flush with the bottom;
• and
• (c) the means for mounting the bottle within the tank comprises a slotted ear formed on the bottle parallel to the sides of the bottle adjacent the bottom and a rectangular spring clip disposed in said slot so as to be normal to the ear, said clip having an L-shaped hanger extending from the top of one end thereof and a pair of opposed locking lugs depending from the bottom corners thereof so as to open into each other, said hanger and lugs lying in the same plane as the clip, said locking lugs being selectively lockable to the slotted ear so that one of said lugs holds the hanger in a retracted position between the bottle sides and the other of said lugs holds the hanger in an extended position beyond one of the bottle sides for engaging the tank.