A flush water supply apparatus for supplying flush water into a flush water tank of a toilet, the flush water supply apparatus comprising:
- a water supply valve for switching between a supply state and a stop state of flush water supplied from a water supply pipe into a flush water tank;
- a small tank provided in the flush water tank;
- a float provided in the small tank, the float being slidable against the small tank in a vertical direction in conjunction with a change of a flush water level in the small tank;
- an arm for causing the water supply valve to switch between the supply state and the stop state, in conjunction with a vertical movement of the float against the small tank;
- a float-position adjusting member connected to the arm and the float, the float-position adjusting member being circumferentially rotatable around an axis thereof so that a relative position between the arm and the float is adjustable;
- and
- a small-tank-position adjusting member connected to the small tank, the small-tank-position adjusting member being circumferentially rotatable around an axis thereof so that a vertical position to which the small tank is supported is adjustable;
- wherein
- the float-position adjusting member and the small-tank-position adjusting member are coaxially arranged,
- when the float-position adjusting member is rotated in one direction, a first contact part of the float-position adjusting member comes in contact with a first contact part of the small-tank-position adjusting member so that the float-position adjusting member and the small-tank-position adjusting member are rotated in the one direction together with each other, and/or when the small-tank-position adjusting member is rotated in the other direction, the first contact part of the small-tank-position adjusting member comes in contact with the first contact part of the float-position adjusting member so that the float-position adjusting member and the small-tank-position adjusting member are rotated in the other direction together with each other,
- when the float-position adjusting member is rotated in the other direction, a second contact part of the float-position adjusting member comes in contact with a second contact part of the small-tank-position adjusting member so that the float-position adjusting member and the small-tank-position adjusting member are rotated in the other direction together with each other, and/or when the small-tank-position adjusting member is rotated in the one direction, the second contact part of the small-tank-position adjusting member comes in contact with the second contact part of the float-position adjusting member so that the float-position adjusting member and the small-tank-position adjusting member are rotated in the one direction together with each other,
- the float-position adjusting member and the small-tank-position adjusting member are rotatable to each other from a state wherein the first contact part of the float-position adjusting member is in contact with the first contact part of the small-tank-position adjusting member to another state wherein the second contact part of the float-position adjusting member is in contact with the second contact part of the small-tank-position adjusting member, and
- an angle by which the float-position adjusting member and the small-tank-position adjusting member are rotatable to each other is 10 degrees or more.