(57) A structure for dispensing an additive into a wash chamber of a dishwashing apparatus
at a predetermined stage in an operating cycle for the apparatus comprises a reservoir
(34, 171) for a supply of additive, a cover (36, 181) movable between a closed position,
wherein it seals the reservoir (34, 171) and an open position, wherein the reservoir
is in communication with the wash chamber, and a timer mechanism (20) which moves
a link (70) through a prescribed path as the dishwashing apparatus cycles and at one
stage in the cycle moves the link (70) through a portion of the path in a first direction
and at another stage the link retraces the path portion in an opposite direction.
As the link (70) moves in the first direction it intercepts and moves a trigger arm
(138, 208) and an associated member (62, 183) so that the cover (36, 181) moves from
its closed position to its open position. Movement of the link (70) in the opposite
direction causes the trigger arm (138, 208) to move relative to its associated member
and the link portion encounters and moves beyond the trigger arm (138, 208) without
moving the cover (36, 181) so that the cover (36, 181) is maintained in its closed
position. This enables the apparatus to be manually reset without unrequired dispensing
of additive.
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