Abstract: A dual flush mechanism which allows the user to select either a full or partial flush, while using a single flush valve. A full flush is obtained by a first handle which lifts a flush valve actuating arm to unseat the flush valve in a conventional manner. For a partial flush, a second handle rotates and lifts a partial-flush control arm which extends beneath the flush valve actuating arm. Upward movement of the partial-flush control arm is limited. Release of the second handle permits the control arm to rotate downwards until stopped by the engagement of a portion of the control arm with a transversely extending lever extension, thereby keeping the flush valve in an unseated position. As the tank water lever lowers, a partial-flush float also lowers, pulling down the end of a lever which pivots so as to linearly retract the lever extension from engagement with the partial-flush control arm. This permits the control arm to drop, reseating the flush valve.

Abstract: A dual flush mechanism which allows the user to select either a full or partial flush, while using a single flush valve. A full flush is obtained by a first handle which lifts a flush valve actuating arm to unseat the flush valve in a conventional manner. For a partial flush, a second handle rotates and lifts a partial-flush control arm which extends beneath the flush valve actuating arm. Upward movement of the control arm is limited. Release of the second handle permits the control arm to rotate downwards until stopped by the engagement of a portion of the control arm with a transversely extending rack extension, thereby keeping the flush valve in an unseated position. As the tank water level lowers, a partial-flush float also lowers, pulling down the end of a lever which pivots with an attached pinion gear, toothed with a rack to linearly retract a rack extension from engagement with the control arm. This permits the control arm to drop, reseating the flush valve.