Drain lock for a flush valve reservoir

1. A flush valve system, comprising:

a reservoir comprising a drain opening for egress of liquids disposed in the reservoir into a surrounding toilet tank;

a lock mechanism movably received by the reservoir, wherein the lock mechanism is translatable between one or more fixed positions on the reservoir, and wherein translating the lock mechanism into the reservoir at increasing depths causes a size of the drain opening to be reduced;

a receiver coupled to the reservoir adjacent to the drain opening, wherein the receiver on the reservoir movably receives the lock mechanism, wherein the lock mechanism further comprises:

one or more bias arms that extend longitudinally along one or more edges of the lock mechanism, each arm comprising an inwardly or outwardly facing projection, wherein one of the bias arms comprises a locking tab;

a detent arm substantially parallel to one of the bias arms to receive the locking tab;

wherein the receiver further comprises one or more grooves associated with the one or more bias arms to slidably receive the projections of the bias arms between the one or more fixed positions; and wherein the lock mechanism is locked in one of the fixed positions when the detent arm receives the locking tab.

2. The system according to claim 1 , wherein the one or more grooves comprises one or more notches or teeth to receive the projections of the bias arms of the lock mechanism.

3. The system according to claim 2 , wherein a beveled edge is positioned on each projection causing the associated bias arm to flex inwardly or outwardly as the beveled edge slides over associated notches or teeth.

4. The system according to claim 2 , further comprising a reinforcement lock with a plurality of locking arms received by the lock mechanism to maintain the lock mechanism in the one or more fixed positions, wherein the locking arms are inserted between the bias arms of the lock mechanism to provide a coupling between the reinforcement lock and the reservoir.

5. The system according to claim 4 , wherein the reinforcement lock comprises a locking member that extends into the lock mechanism when the locking arms are inserted between the bias arms to fix the lock mechanism in one of the fixed positions.

6. The system according to claim 2 , wherein the detent arm further comprises a tab receiving surface, wherein the detent arm is flexed until the tab receiving surface is coupled to the locking tab.

7. The system according to claim 2 , wherein each bias arm and the detent arm are flexible and wherein when flexed, return to their pre-flexed position.

8. The system according to claim 1 , wherein the drain opening is approximately 0.15 inches, 0.3 inches, 0.35 inches or less than or equal to 0.6 inches.

9. A method of adjusting a drain opening in a reservoir of a flush valve system in a toilet tank, comprising:

slidably inserting a lock mechanism into a receiver coupled to the reservoir, wherein the drain opening governs egress of liquids disposed in the reservoir into the surrounding tank;

translating the lock mechanism between one or more fixed positions on the receiver by slidably inserting one or more bias arms of the lock mechanism into one or more grooves of the receiver, and wherein translating the lock mechanism at increasing depths into the receiver causes a size of the drain opening of the reservoir to be adjusted;

fixing the locking mechanism in one of the one or more fixed positions by coupling a detent arm of the lock mechanism with one of the bias arms.

10. The method according to claim 9 , wherein the one or more bias arms comprise projections facing inwardly or outwardly relative to the receiver and are received by the receiver.

11. The method according to claim 9 , wherein the one or more grooves comprises one or more notches or teeth to receive the projections of the bias arms of the lock mechanism, the method further comprising:

positioning the lock mechanism in one of the one or more fixed positions by coupling each projection with an associated notch or tooth.

12. The method according to claim 10 , further comprising:

flexing the one or more bias arms outwardly or inwardly causing the projection to couple with an associated notch or tooth.

13. The method according to claim 11 , further comprising:

reinforcing the lock mechanism in the one or more fixed positions by removably attaching a reinforcement lock onto the lock mechanism; and

slidably inserting arms of the reinforcement lock between the bias arms of the lock mechanism to removably couple the reinforcement lock to the lock mechanism and the receiver.

14. The method according to claim 9 , wherein each bias arm and the detent arm are flexible and wherein when flexed, return to their pre-flexed position.