Passive dispenser fordosing and issuing a predetermined amount of dispensable liquid

Abstract

A dispenser for dispensing metered amount of liquid into a toilet cistern, comprising a basin adapted to receive a metered amount of dispensable liquid received from a container via a discharge spout. An airlock prevents further discharge of liquid above a predetermined amount in the basin when the discharge spout is covered by the dispensable liquid. A siphon inlet is in liquid communication with the metered amount in the basin, and the siphon outlet is in liquid communications with the cistern water at quiescent times. Upon flush, the siphon siphons out the dispensable liquid in the basin, breaking the airlock, and allowing a new metered amount of dispensable liquid to flow to he basin, ready for next flush.

1 . A passive dispenser for dosing and issuing a metered amount of dispensable liquid into a cistern tank, from a volume of dispensable liquid stored in a container, the dispenser comprises: 
 a basin dimensioned for receiving at least a metered amount of dispensable liquid;    a discharge spout disposed in said basin, and coupled in fluid communication to said container, for discharging said metered amount into said basin; and,    a siphon having a siphon inlet in fluid communications with said metered amount, and a siphon outlet outside said basin.    
     
     
         2 . The passive dispenser of  claim 1  wherein said discharge spout is disposed within said basin such that when the basin contains said at least metered amount of liquid, said liquid covers the mouth of said discharge spout, for forming an airlock in said container.  
     
     
         3 . The passive dispenser of  claim 1  further comprising a surface tension moderator in the form of an upright projecting from said basin and overlappingly penetrating the mouth of said discharge spout.  
     
     
         4 . The passive dispenser of  claim 1 , wherein said basin walls are adapted to be immersed below the cistern water during quiescent periods.  
     
     
         5 . A passive dispenser as in  claim 1 , wherein the dispenser is having the capability of varying the amount of dispensable liquid added to the cistern water.  
     
     
         6 . A passive dispenser as in  claim 5 , wherein said discharge spout is adjustably movable to modify the distance between the mouth of said discharge spout and said basin floor, for varying the metered amount by varying the level of dispensable level dispensed in the basin.  
     
     
         7 . A passive dispenser as in  claim 1 , wherein said basin further comprises discharge control means for providing restrained discharge of dispensable liquid from said discharge spout, said discharge spout comprises an externally threaded end compatibly receivable within an internally threaded upstanding sleeve attached to said basin and encircling said threaded end, said sleeve comprises at least one aperture or cut-out area, the extent of exposure of which is defined by the vertical adjustment of said threaded end within said sleeve.  
     
     
         8 . A passive dispenser for dosing and issuing a metered amount of dispensable liquid into a cistern tank, from a volume of dispensable liquid stored in a container, the dispenser comprises: 
 a basin dimensioned for receiving at least a metered amount of dispensable liquid;    a discharge spout disposed in said basin, and coupled in fluid communication to said container, for discharging said metered amount into said basin;    a siphon having a siphon inlet in fluid communications with said metered amount, and a siphon outlet outside said basin;    wherein said basin is disposed coaxially to at least a portion of said discharge spout.    
     
     
         9 . The passive dispenser of  claim 8  wherein said discharge spout is disposed within said basin such that when the basin contains said at least metered amount of liquid, said liquid covers the mouth of said discharge spout, for forming an airlock in said container.  
     
     
         10 . The passive dispenser of  claim 8  further comprising a surface tension moderator in the form of an upright projecting from said basin and overlappingly penetrating the mouth of said discharge spout.  
     
     
         11 . A passive dispenser as in  claim 8 , wherein said basin further comprises discharge control means for providing restrained discharge of dispensable liquid from said discharge spout, said discharge spout comprises an externally threaded end compatibly receivable within an internally threaded upstanding sleeve attached to said basin and encircling said threaded end, said sleeve comprises at least one aperture or cut-out area, the extent of exposure of which is defined by the vertical adjustment of said threaded end within said sleeve.