Dishwasher

A sink mounted dishwasher comprising a sink having a base and side walls, a drain located in said base, a spray arm removably and rotatably mounted in said sink and rotatable by water directed into said spray arm by a pump connected to said drain, wherein a drain closure member is mounted in said drain below the pump connection and is operable between a drain closed configuration in which water in said sink can be circulated by said pump through said spray arm, and a drain open configuration in which water in said sink is drained under gravity through said drain closure member, and wherein said drain closure member comprises a cap mounted for longitudinal reciprocal movement along said drain into and out of an enlarged drain portion, the diameter of said cap corresponding to that of said drain whereby said drain is open only when said cap is in said enlarged portion.

A sink mounted dishwasher comprising a sink having a base and side walls, a drain located in said base, a spray arm removably and rotatably mounted in said sink and rotatable by water directed into said spray arm by a pump connected to said drain, wherein a drain closure member is mounted in said drain blow the pump connection and is operable between a drain closed configuration in which water in said sink can be circulated by said pump through said spray arm, and a drain open configuration in which water in said sink is drained under gravity through said drain closure member, and wherein said drain closure member comprises a hollow torroid of elastically deformable sheet material having its outer surface sealingly secured to the inner surface of said drain, the interior of said torroid being connected to a source of hydraulic fluid, said torroid when not pressurized by said fluid having an aperture therethrough through which liquid in said drain can pass, and said torroid when pressurized by said fluid expanding to constrict said aperture and substantially prevent the passage of liquid therethrough.

A sink mounted dishwasher comprising a sink having a base and side walls, a drain located in said base, a spray arm removably and rotatably mounted in said sink and rotatable by water directed into said spray arm by a pump connected to said drain, wherein a drain closure member is mounted in said drain below the pump connection and is operable between a drain closed configuration in which water in said sink can be circulated by said pump through said spray arm, and a drain open configuration in which water in said sink is drained under gravity through said drain closure member, said dishwasher further comprising a substantially cylindrical hollow body dimensioned to be insertable into said drain, a collar substantially co-axial with said cylindrical body and located at one, upper, end thereof by a plurality of supporting webs, said collar supporting said spray arm, a hollow elbow interconnecting said collar with an opening in the side wall of said body communicable with a pump outlet, said elbow communicating said pump outlet with a hollow interior of said spray arm via said collar without obstructing liquid draining from said sink between said webs and through said hollow body.

A sink mounted dishwasher comprising a sink having a base and side walls, a drain located in said base, a spray arm removably and rotatably mounted in said sink and rotatable by water directed into said spray arm by a pump connected to said drain, wherein a drain closure member is mounted in said drain below the pump connection and is operable between a drain closed configuration in which water in said sink can be circulated by said pump through said spray arm, and a drain open configuration in which water in said sink is drained under gravity through said drain closure member, said dishwasher further comprising an hydraulically operated liquid detergent dispenser, an hydraulically operated drain closure member, and an hydraulic control system therefor, said system comprising a reservoir for liquid rinse aid, a rinse aid pump having an inlet connected to said reservoir and an outlet connected to three solenoid valves, a first one of said solenoid valves communicating said rinse aid to said detergent dispenser to hydraulically control the operation of same, a second one of said solenoid valves communicating said rinse aid to said drain closure member to hydraulically control the operation of same, and the third one of said solenoid valves connecting said rinse aid to said dishwasher to dispense same.