Toilet seat device

1. A toilet seat device which includes:

a main body installed at an upper rear part of a toilet;

a toilet seat attached to the main body; and

a toilet lid configured to rotatably attach to the main body and to open and close an upper side of the toilet seat, wherein the toilet lid includes:

a toilet lid main body configured to cover the upper portion of the toilet seat; and

a shaft engagement part which is attached to the toilet lid main body and is attachable to and detachable from a shaft provided on the main body,

the shaft engagement part is configured to be switchable between an engaged state and a non-engaged state,

in the engaged state, the shaft engagement part is engaged with the shaft and movement of the shaft engagement part in the upward-downward direction and the forward-rearward direction is restrained and

in the non-engaged state, the engagement with the shaft is released and the movement of the shaft engagement part in the upward-downward direction is allowed, and

when the toilet lid is opened in the engaged state, when the toilet lid main body is pressed toward a rear side of the main body, the shaft engagement part is switched to the non-engaged state.

2. The toilet seat device of claim 1 , wherein the shaft engagement part has a biasing portion configured to perform biasing so that a posture is changed from a posture in the non-engaged state to a posture in the engaged state.

3. The toilet seat device of claim 1 , wherein the shaft engagement part includes:

a concave part opened downward when the toilet lid is in an open state and configured such that the shaft is capable of being put in and put out from a lower side, the concave part being configured to be capable of accommodating the shaft; and

a movable portion configured to be movable,

when the toilet lid is in the open state, the movable portion closing a lower portion of the concave part to be in the engaged state by moving toward one side in a movable direction, and opening the lower portion of the concave part to be in the non-engaged state by moving toward the other side in the movable direction,

wherein the movable portion has an abutting portion with which the shaft located below the concave part is capable of coming into contact from below when the toilet lid is in the open state, and

the abutting portion is formed on an inclined surface which is gradually inclined from the other side toward the one side in the movable direction as going from a lower side toward an upper side when the toilet lid is in the open state.

4. The toilet seat device of claim 1 , wherein the shaft engagement part is attached to an end part of the toilet lid main body in a width direction,

the main body has a toilet lid support portion being in contact with an intermediate portion of the toilet lid in the width direction from a rear side when the toilet lid is in an open state, and

the shaft engagement part is configured to be removed from the shaft when the toilet lid is deflected so that the intermediate portion of the toilet lid in the width direction comes into contact with the toilet lid support portion when the toilet lid is in the open state and an end part of the toilet lid in the width direction becomes located rear side than the intermediate portion in the width direction.

5. The toilet seat device of claim 4 , wherein the toilet seat device includes a concave part opened downward and configured such that the shaft is capable of being put in and put out from a lower side, the concave part being configured to be capable of accommodating the shaft when the toilet lid is in the open state; and

a movable portion configured to be movable,

when the toilet is in the open state, the movable portion closes a lower portion of the concave part to be in the engaged state by moving toward one side in a movable direction, and opening the lower portion of the concave part to be in the non-engaged state by moving toward the other side in the movable direction,

wherein the movable portion has a contact portion with which the shaft accommodated in the concave part is able to come into contact, and

the shaft engagement part is configured to be removed from the shaft when the toilet lid is deflected so that the intermediate portion of the toilet lid in the width direction comes into contact with the toilet lid support portion when the toilet lid is in the open state and an end part of the toilet lid in the width direction becomes located rear side than the intermediate portion in the width direction.

6. The toilet seat device of claim 4 , wherein the shaft engagement part is arranged further outward in the width direction than the toilet lid support portion.

7. A toilet seat device which includes:

a main body installed at an upper rear part of a toilet;

a toilet seat attached to the main body; and

a toilet lid configured to open and close an upper part of the toilet seat, wherein the toilet lid includes:

a toilet lid main body configured to close the upper part of the toilet seat; and

a shaft engagement part which is attached to an end part of the toilet lid main body in a width direction and is detachably attached to a shaft provided on the main body,

the main body has a toilet lid support portion being in contact with an intermediate portion of the toilet lid in the width direction from a rear side when the toilet lid is in an open state, and

the shaft engagement part is configured to be removed from the shaft when the toilet lid is deflected so that the intermediate portion of the toilet lid in the width direction comes into contact with the toilet lid support portion when the toilet lid is in the open state and an end part of the toilet lid in the width direction becomes located rear side than the intermediate portion in the width direction.

8. The toilet seat device of claim 7 , wherein the shaft engagement part is configured to be switchable between an engaged state in which the shaft engagement part is engaged with the shaft and a non-engaged state in which the engagement with the shaft is released, and

the toilet seat device includes a concave part opened downward and configured such that the shaft is capable of being put in and put out from a lower side, the concave part being configured to be capable of accommodating the shaft; and

a movable portion configured to be movable, the movable portion closing a lower portion of the concave part to be in the engaged state by moving toward one side in a movable direction, and opening the lower portion of the concave part to be in the non-engaged state by moving toward the other side in the movable direction,

wherein the movable portion has a contact portion with which the shaft accommodated in the concave part is able to come into contact, and

the shaft engagement part is configured to be removed from the shaft when the toilet lid is deflected so that the intermediate portion of the toilet lid in the width direction comes into contact with the toilet lid support portion when the toilet lid is in the open state and an end part of the toilet lid in the width direction becomes located rear side than the intermediate portion in the width direction.

9. The toilet seat device of claim 7 , wherein the shaft engagement part is arranged further outward in the width direction than the toilet lid support portion.

10. A toilet seat device which includes:

a main body installed at an upper rear part of a toilet;

a toilet seat attached to the main body; and

a toilet lid configured to rotatably attached to the main body and to open and close upper side of the toilet seat, wherein the toilet lid includes:

a toilet lid main body configured to cover the upper portion of the toilet seat; and

a shaft engagement part which is attached to the toilet lid main body and is attachable to and detachable from a shaft provided on the main body,

the shaft engagement part is configured to be switchable between an engaged state in which the shaft engagement part is engaged with the shaft and a non-engaged state in which the engagement with the shaft is released,

when the toilet lid is opened in the engaged state, when the toilet lid main body is pressed in a direction in which the toilet lid main body moves away from the toilet seat in the engaged state, the shaft engagement part is switched to the non-engaged state,

the shaft engagement part has a biasing portion configured to perform biasing so that a posture is changed from a posture in the non-engaged state to a posture in the engaged state.