Reclining device

1. A reclining device comprising:

a first member attached to one member of a seat back-side member and a seat cushion-side member, and having a penetration hole;

a second member fitted into the first member so as to be capable of relative rotation with respect to the first member, and attached to the other member of the seat back-side member and the seat cushion-side member;

a lock mechanism configured to cause a locked state in which relative rotation of the first and second members is controlled or an unlocked state in which the relative rotation is enabled;

an operation member disposed on an axis of the relative rotation, the operation member having a protrusion protruding outward from the penetration hole of the first member, and configured to rotate to switch the lock mechanism between the locked state and the unlocked state;

a spring disposed at the first member so as to be at least partially exposed to the outside, locked at one end part on the first member, locked at the other end part on the protrusion of the operation member, and biases the operation member to bring the lock mechanism into the locked state; and

a spring cover covering the spring, the spring cover having: a bottom part, and an outer peripheral surface including a continuous wall surface erecting from the bottom part toward the first member, a surface of the spring cover facing the bottom part being an open surface,

wherein the first member includes a plurality of attachment protrusions,

the spring cover includes an elastic protrusion, and

the elastic protrusion of the spring cover is brought into press-contact with one of the plurality of attachment protrusions of the first member to bring the outer peripheral surface of the spring cover into contact with another one of the plurality of attachment protrusions, such that the spring cover is fixed to the first member.

2. The reclining device according to claim 1 , wherein the elastic protrusion of the spring cover is bent from an end part of the outer peripheral surface on the side of the open surface to extend in a direction away from the outer peripheral surface of the spring cover and then run in a direction away from the open surface.

3. The reclining device according to claim 1 , wherein the elastic protrusion of the spring cover is cut and raised from an intermediate part of the outer peripheral surface of the spring cover, and a leading end part of the elastic protrusion extends in a direction away from the outer peripheral surface of the spring cover.

4. The reclining device according to claim 1 , wherein the elastic protrusion of the spring cover protrudes in a direction away from the outer peripheral surface of the spring cover.

5. The reclining device according to claim 1 , wherein side surfaces of the plurality attachment protrusions of the first member have a protrusion protruding toward the outer peripheral surface of the spring cover.

6. The reclining device according to claim 1 , wherein the outer peripheral surface of the spring cover comes closer to the side surface of the attachment protrusion of the first member as the outer peripheral surface runs from the bottom part toward an end part of the outer peripheral surface on the side of the open surface.

7. The reclining device according to claim 1 , wherein the plurality of attachment protrusions of the first member is engaged with a hole formed in one member of the seat back-side member and the seat cushion-side member.

8. The reclining device according to claim 1 , wherein the number of the plurality of attachment protrusions is three.