Flushing valve mechanism

Abstract

A dual quantity flushing valve mechanism comprising a housing having a base fitting for attachment to a water outlet of a toilet cistern, an overflow tube axially displaceable within the housing and having a bottom portion extending substantially coaxial within the housing, a top portion parallel to the bottom portion and extending outside of the housing, and an intermediate, inclined portion extending between the top portion and the bottom and projecting through the housing, with a seal disc fitted at a bottom of the bottom portion for sealing engagement of the water outlet. The mechanism further comprising an internal float coaxial over the bottom portion of the overflow tube, has an axial displacement restrictor articulated thereto and an external float fixed to the overflow tube, an operating mechanism fitted within the housing, for axial displacement of the overflow tube, however with selective axial displacement of the internal float responsive to a operating a long flush actuator or a short flush actuator, articulated with said operating mechanism.

1 . A dual quantity flushing valve mechanism comprising: 
 a housing having a base fitting for attachment to a water outlet of a toilet cistern;    an overflow tube axially displaceable within the housing and having a bottom portion extending substantially coaxial within the housing, a top portion parallel to said bottom portion and extending outside of the housing, and an intermediate, inclined portion extending between the top portion and the bottom and projecting through the housing, there being a seal disc fitted at a bottom of the bottom portion for sealing engagement of the water outlet;    an internal float coaxial over the bottom portion of the overflow tube, having an axial displacement restrictor articulated thereto;    an external float fixed to the overflow tube; and    an operating mechanism fitted within the housing, for axial displacement of the overflow tube, however with selective axial displacement of the internal float responsive to a operating a long flush actuator or a short flush actuator, articulated with said operating mechanism.    
   
   
       2 . A flushing valve according to  claim 1 , wherein a top end of the top portion is fitted with a telescopic extension piece, for calibrating overfill water level with the cistern.  
   
   
       3 . A flushing valve according to  claim 1 , wherein the external float is axially displaceable so as to calibrate the amount of water discharged at a short flush.  
   
   
       4 . A flushing valve according to  claim 3 , wherein the external float is axially displaceable by a rack extending outside of said housing and fixedly attached to the overflow tube.  
   
   
       5 . A flushing valve according to  claim 3 , wherein the external float is articulated to the bottom portion of the overflow tube via a slot formed in the housing.  
   
   
       6 . A flushing valve according to  claim 1 , wherein the operating mechanism comprises a short flush rocker lever and a long flush rocker lever pivotally secured within the housing, said rocker levers being engageable at one end to the respective long flush actuator and the short flush actuator, and an opposite end to the overflow tube, for elevation thereof within the housing, and where said short flush rocker lever is articulated with a barrier member such that pivotal displace of the short flush rocker lever entails pivotal displacement of the barrier into a position for encountering the axial displacement restrictor of the internal float.  
   
   
       7 . A flushing valve according to  claim 1 , wherein the long flush actuator and the short flush actuator are push buttons fitted in a top cover mounted on the housing.  
   
   
       8 . A flushing valve according to  claim 7 , wherein the push buttons are each fitted with a length-adjustable stem for engaging a corresponding rocker lever of the operating mechanism.  
   
   
       9 . A flushing valve according to  claim 1 , wherein the long flush actuator and the short flush actuator are pull levers articulated to lever arms.  
   
   
       10 . A flushing valve according to  claim 1 , wherein upwards axial displacement of the internal float is restricted by a lateral restriction element fitted on the bottom portion of the overflow tube and adapted for engaging a top face of the internal float.  
   
   
       11 . A flushing valve according to  claim 1 , wherein the housing is formed at its bottom with a compartment extending between a base portion and a coaxial sleeve portion, slidingly accommodating the internal float, said compartment fitted at its bottom with an outlet for slow release of water to thereby create a damping effect and impede descent of the internal float.  
   
   
       12 . A flushing valve according to  claim 11 , wherein the size of the outlet is controllable for calibrating the internal float descending rate.  
   
   
       13 . A flushing valve according to  claim 1 , wherein the base fitting is articulated to a base coupler attached in turn to a water outlet of a toilet cistern.  
   
   
       14 . A toilet flushing cistern fitted with a dual quantity flushing valve mechanism according to  claim 1.