Contact device

1. A contact device comprising:

a base;

a pair of fixed terminals placed on the base in such a manner as to partially protrude inside the base, respectively;

a movable contact member stored inside the base, the movable contact member being opposed to the pair of fixed terminals and being freely movable relative to the pair of fixed terminals;

a shaft provided with the movable contact member fixed to one end thereof, the shaft extending in a moving direction of the movable contact member; and

at least one rotation stopper formed separately from the movable contact member and provided between the movable contact member and the base so as to regulate a rotation of the movable contact member about the shaft, the at least one rotation stopper regulating a movement in one rotating direction of the movable contact member by contact with an edge of a long side of the movable contact member,

wherein the movable contact member is movable between a position where the movable contact member is in direct contact with the pair of fixed terminals and a position where the movable contact member is not in contact with the pair of fixed terminals, and

the rotation stopper is a protrusion that projects inwardly from an inner wall surface of the base in the direction of the movable contact member.

2. The contact device according to claim 1 , wherein the rotation stopper is composed of one member and includes a first contact surface that regulates the movement in one rotating direction of the movable contact member, and a second contact surface that regulates a movement in another rotating direction of the movable contact member.

3. The contact device according to claim 1 , wherein the rotation stopper is provided on a short side of the inner wall surface of the base opposed to a short side of the movable contact member.

4. The contact device according to claim 1 , wherein a contact surface of the rotation stopper with the movable contact member is provided perpendicular to the rotating direction of the movable contact member.

5. The contact device according to claim 2 , wherein the rotation stopper is provided on a short side of the inner wall surface of the base opposed to a short side of the movable contact member.

6. The contact device according to claim 2 , wherein a contact surface of the rotation stopper with the movable contact member is provided perpendicular to the rotating direction of the movable contact member.

7. The contact device according to claim 3 , wherein the rotation stopper is provided on only one surface of the short side of the inner wall surface of the base.

8. The contact device according to claim 5 , wherein the rotation stopper is provided on only one surface of the short side of the inner wall surface of the base.

9. The contact device according to claim 1 , further comprising:

a pressure contact spring in direct contact with the movable contact member and configured to move the movable contact member toward the pair of fixed terminals by stretching of the pressure contact spring, the movable contact member being rotated by a torque of the pressure contact spring.

10. The contact device according to claim 1 , wherein the shaft extends fully through the movable contact member.

11. The contact device according to claim 1 , wherein the base surrounds the movable contact member such that no inner wall of the base contacts the movable contact member, and the protrusion extends inwardly from the inner wall surface such that the length of the protrusion is greater than a distance between the inner wall and a short side of the movable contact member adjacent the inner wall.