Patent ID: 11927004
Assignee: TOTO LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A flush water tank device for supplying flush water to an upper spout port above a retained water surface in a flush toilet main body and a lower spout port below the retained water surface, the flush water tank device comprising:
a flush water tank main body;
a discharge valve that causes the flush water retained in the flush water tank main body to be drained and causes the flush water to be ejected from the lower spout port on the basis of an operation of a user;
a first on-off valve for performing switching between an ejection state from the upper spout port and an ejection stopped state of the flush water supplied from a water supply source;
a first on-off valve driving mechanism that is moved from a stopped position at which the first on-off valve is brought into the ejection stopped state to an ejection position at which the first on-off valve is brought into the ejection state on the basis of the operation of the user;
a biasing mechanism that causes a bias force such that the first on-off valve driving mechanism is moved to the stopped position;
a holding mechanism that holds the first on-off valve driving mechanism which has been moved to the ejection position at the ejection position against the bias force caused by the biasing mechanism; and
a releasing mechanism that releases the holding of the first on-off valve driving mechanism achieved by the holding mechanism, using the flush water flowing out from the first on-off valve.