Arm rest

1. An arm rest attachable to a seat for a vehicle occupant to sit on, the arm rest comprising:

side members;

a front member; and

a rear member,

wherein the side members comprise a pair of side members provided at left and right sides of the vehicle occupant and extending in a front-rear direction,

wherein the front member is in front of the vehicle occupant when the vehicle occupant is seated and is configured to couple front sides of the left and right side members to each other at least when in use,

wherein the rear member couples the seat to rear sides of the side members, and

wherein the side members and the front member are rotatable about a line that connects left and right coupled points between the rear member and the seat, and

wherein the side members are configured to move away from the vehicle occupant when a collision occurs or when a collision is predicted.

2. The arm rest according to claim 1 ,

wherein the side members are configured to move to increase in width at least toward one side in a left-right direction.

3. The arm rest according to claim 2 ,

wherein the side members are configured to move until coming into abutment with either one of a door component and a vehicle-body component.

4. The arm rest according to claim 3 ,

wherein at least one of the front member or the side members comprises an airbag configured to deploy toward the vehicle occupant.

5. The arm rest according to claim 2 ,

wherein at least one of the front member or the side members comprises an airbag configured to deploy toward the vehicle occupant.

6. The arm rest according to claim 1 ,

wherein the side members are configured to slide in the same direction as a direction in which the vehicle occupant moves due to the collision.

7. The arm rest according to claim 6 ,

wherein the side members are configured to move until coming into abutment with either one of a door component and a vehicle-body component.

8. The arm rest according to claim 7 ,

wherein at least one of the front member or the side members comprises an airbag configured to deploy toward the vehicle occupant.

9. The arm rest according to claim 6 ,

wherein at least one of the front member or the side members comprises an airbag configured to deploy toward the vehicle occupant.

10. The arm rest according to claim 1 ,

wherein the side members are configured to move until coming into abutment with either one of a door component and a vehicle-body component.

11. The arm rest according to claim 10 ,

wherein at least one of the front member or the side members comprises an airbag configured to deploy toward the vehicle occupant.

12. The arm rest according to claim 1 ,

wherein at least one of the front member or the side members comprises an airbag configured to deploy toward the vehicle occupant.

13. The arm rest according to claim 1 ,

wherein the front member comprises split front segments each having an interior end and wherein the interior ends are adjustable in relative position.

14. The arm rest according to claim 13 ,

wherein the front member comprises a rotation shaft rotatably coupled to the interior ends of the split front segments such that the interior ends are rotatable with respect to each other about the rotation shaft.

15. The arm rest according to claim 13 ,

wherein the interior ends are arranged as to move away from each other when a collision occurs or when a collision is predicted.