Door apparatus of railcar

1 . A door apparatus of a railcar, the door apparatus comprising:

a side sliding door that opens and closes a door opening of a side bodyshell of the railcar;

a first elastic structure attached to a door end of the side sliding door in a vertical direction;

a second elastic structure that is opposed to the first elastic structure, the second elastic structure being in a non-contact state with respect to the first elastic structure when the side sliding door is in a fully closed state; and

an elastic fin separable from the first elastic structure and the second elastic structure, wherein:

the first elastic structure includes a first base and a first projecting wall projecting from the first base toward the second elastic structure;

the second elastic structure includes a second base and a second projecting wall projecting from the second base toward the first elastic structure;

the first elastic structure further includes:

a convex portion projecting from an end portion of the first base in a thickness direction of the side sliding door toward a tip of the second projecting wall while being spaced apart from the first projecting wall in the thickness direction, and

an engaged groove defined by the first base, the first projecting wall, and the convex portion;

when the side sliding door is in the fully closed state, there is a space between the first elastic structure and the second elastic structure, and the first projecting wall and the second projecting wall are located so as to overlap each other when viewed in a thickness direction of the side sliding door;

the elastic fin includes:

an attaching portion which is detachably attached to the engaged groove, and

a fin portion projecting from the attaching portion; and

when the side sliding door is in the fully closed state, the fin portion contacts the second elastic structure.

2 . The door apparatus according to claim 1 , wherein:

the space includes an opening that faces one of a car outside and a car inside in a car width direction; and

the elastic fin overlaps the opening when viewed in the car width direction.

3 . The door apparatus according to claim 2 , wherein:

at least one of an outer surface of the first projecting wall and an outer surface of the second projecting wall which faces the space includes grooves;

the opening includes a car inside opening that faces the car inside in the car width direction; and

the elastic fin is located at the car inside opening when viewed from the car inside in the car width direction.

4 . The door apparatus according to claim 1 , wherein the fin portion contacts a tip of the second elastic structure in a slide direction of the side sliding door.

5 . The door apparatus according to claim 1 , wherein:

the first elastic structure includes an opposing surface that is opposed to a tip of the second elastic structure in a slide direction;

when the side sliding door is in the fully closed state, there is a gap between the opposing surface of the one of the first elastic structure and the second elastic structure and the tip of the other of the first elastic structure and the second elastic structure; and

the fin portion is located at the gap, and the attaching portion is located outside the gap.

6 . The door apparatus according to claim 1 , wherein the elastic fin extends from an upper end of the space to a lower end of the space in the vertical direction.

7 . The door apparatus according to claim 1 , wherein a material of the elastic fin includes a material that is lower in friction coefficient and more flexible than a material of the first elastic structure and the second elastic structure.

8 . The door apparatus according to claim 1 , wherein the fin portion includes a slit that extends in a horizontal direction from a horizontal direction tip of the fin portion.

9 . The door apparatus according to claim 1 , wherein the elastic fin is divided in the vertical direction.