Locking device for opening/closing body

1. A locking device for an opening and closing body that is openably and closably attached to an opening portion of a fixed body, the locking device comprising:

a lock portion provided on one of the fixed body or the opening and closing body;

a rod disposed on an other member of the fixed body or the opening and closing body and configured to slide via an operation member to engage with and disengage from the lock portion; and

a protrusion protruding from the other member of the fixed body or the opening and closing body, wherein

the rod has a recess surrounded by a pair of first walls disposed to face each other in a sliding direction of the rod and a pair of second walls disposed to face each other in a direction orthogonal to the sliding direction,

the protrusion is disposed inside the recess or inside and outside the recess, and is provided with a flange portion provided on a tip end side in a protruding direction of the protrusion,

the rod has a first elastic piece that extends from one of the pair of first walls toward an other of the pair of first walls and applies an elastic force by being elastically abutted against a tip end surface of the protrusion in the protruding direction, and a pair of second elastic pieces that extend from an inner surface or an outer surface of the pair of second walls,

each of the second elastic pieces has a receiving surface that engages with a back surface of the flange portion, and is configured to elastically abut against a side surface of the protrusion; and

the rod is configured to move with respect to the protrusion in the sliding direction.

2. The locking device for the opening and closing body according to claim 1 , wherein

the recess opens from a bottom surface side of the rod toward a ceiling surface on a side opposite to the bottom surface side, and

the pair of second elastic pieces extend from an opening of the recess on the bottom surface side toward a side of the ceiling surface on a side of the inner surface of the pair of second walls.

3. The locking device for the opening and closing body according to claim 2 , wherein

the pair of second elastic pieces are provided on the inner surface side of the pair of second walls, and extend from the opening of the recess on the bottom surface side toward the side of the ceiling surface so as to be close to each other.

4. The locking device for the opening and closing body according to claim 1 , wherein

base ends of the pair of second elastic pieces are connected to the second wall at a side of one of the first walls, and tip ends of the pair of second elastic pieces extend away from a corresponding second wall toward a side of the other of the first walls, and

side edge portions on the tip end sides of the pair of second elastic pieces form the receiving surface.

5. The locking device for the opening and closing body according to claim 1 , wherein

the first elastic piece extends so as to be located between the pair of second elastic pieces.

6. The locking device for the opening and closing body according to claim 1 , wherein

each of the pair of second elastic pieces has a fixed end and a free end.

7. The locking device for the opening and closing body according to claim 1 , wherein

each of the pair of second elastic pieces extends so as to form a space between each of the pair of second elastic pieces and the inner surface or the outer surface of each of the pair of second walls.

8. The locking device for the opening and closing body according to claim 1 , wherein

each of the pair of second elastic pieces has a tip end formed in a bifurcated shape.

9. The locking device for the opening and closing body according to claim 1 , wherein

a maximum width of a part of the protrusion in the sliding direction is smaller than a width of the recess in the sliding direction at height where the maximum width is present, the part of the protrusion configured to be disposed inside the recess.