Damper device

1. A damper device comprising:

a first rotational element rotatable about a rotational center;

a second rotational element rotatable about the rotational center;

a third rotational element rotatable about the rotational center;

a first elastic element that is located between the first rotational element and the third rotational element and is elastically compressed by relative rotation of the first rotational element with respect to the third rotational element in one of rotational directions;

a second elastic element that is located between the third rotational element and the second rotational element and is elastically compressed by relative rotation of the third rotational element with respect to the second rotational element in the one of the rotational directions;

a support member that is intervenient between the third rotational element and the first elastic element, to support the first elastic element; and

a restrictor provided with the third rotational element, to:

rotatably support the support member in a plane orthogonal to the rotational center,

restrict the support member from rotating beyond a certain angle, and

restrict the support member from moving away from the third rotational element in the rotational directions.

2. The damper device according to claim 1 , wherein the restrictor includes:

a protrusion that protrudes from the third rotational element in a direction crossing radial directions, as viewed in axial directions, and

a hook that protrudes from the protrusion away from the third rotational element in the rotational directions and comes into contact with the support member which is to move away from the third rotational element in the rotational directions.

3. The damper device according to claim 2 , wherein

the hook protrudes from the protrusion toward the rotational center in the radial directions, and

the support member comprises an engaging part located between the third rotational element and the hook in the rotational directions.

4. The damper device according to claim 3 , wherein

the hook extends toward the rotational center from a basal end to a distal end.

5. The damper device according to claim 2 , wherein

the third rotational element comprises an arm extending in the radial direction, and

the restrictor protrudes from an edge of the arm in the rotational direction.

6. The damper device according to claim 5 , wherein

in a first width direction orthogonal to a direction in which the restrictor protrudes from the arm, the restrictor has a longer length at a distal end than a part closer to the arm than the distal end.

7. The damper device according to claim 6 , wherein

the support member is provided with a concave opening toward the third rotational element in the rotational directions, and

the restrictor is contained in the concave.

8. The damper device according to claim 7 , wherein

the restrictor includes an arc-shaped edge recessed outward in the radial directions.

9. The damper device according to claim 8 , wherein the support member is provided with:

a first contact edge facing the third rotational element,

a second contact edge facing the third rotational element,

an arc-shaped first inner edge that is connected to the first contact edge and contacts with the edge of the restrictor, and

a second inner edge that connects the first inner edge and the second contact edge.

10. The damper device according to claim 9 , wherein

the first inner edge and the second inner edge define at least part of the concave, and

in a second width direction orthogonal to a direction in which the concave extends, the concave has a longer length at a distal end than at a part closer to the first contact edge and the second contact edge than the distal end.