Abstract: A buoyant outlet closure, or `flapper` in the preferred embodiment, is vented at a selectively predetermined time in the water closet flushing cycle, causing the flapper to become non-buoyant and to drop and to close the tank outlet, effecting a premature termination of the flushing cycle, and saving the volume of water remaining in the tank. The venting is controlled by turning the externally mounted operating handle in one direction. When the operating handle is turned in the opposite direction, essentially all the water is discharged from the tank, effecting a full flush cycle.

Abstract: A tensioning device (10) for a flexible drive element (16), the tensioning device comprising a first tensioning member (40) having a first contact surface (58), and a second tensioning member (140) having a second contact surface (158). Straps (34, 36) and positioning devices (42, 44, 142, 144) secure the first and second tensioning members a selected distance away from one another. In one arrangement, the positioning devices form a ratchet-like mechanism arranged such that the force required to move the tensioning members toward one another is smaller than the force required to move the tensioning members away from one another. The tensioning device may be operated without any members securing the tensioning device with respect to the sprockets.

Abstract: An apparatus for counting and stacking food products such as tortillas. The tortillas are initially placed on an entry chute containing a large number of air outlets for creating a cushion of air to allow the tortilla to slide down the entry chute onto an incline conveyor belt. The conveyor belt is of an open mesh design and it is supported on a belt support having a large number of air inlets which create a vacuum that maintains the tortilla in contact with the belt. The tortillas are carried by the belt down one end of the belt support and along the underside of the belt support with contact between the tortilla and belt being maintained by vacuum creating air inlets formed in the belt support. The air inlets terminate at a location on the underside of the belt support thereby allowing the tortillas to drop from the conveyor belt. The tortillas drop onto a stationary rack formed by rods which are interleaved with conveyor belts moving together as a unit.