Switch

1. A switch, comprising:

a housing having a hollow box shape;

a circuit provided inside the housing; and

a movable part to be manipulated by a user to control the circuit,

wherein the housing includes:

a case member having an opened front face; and

a cover member firmly fixed with the case member to close the opened front face of the case member,

wherein the case member has a penetration hole penetrating its side face,

wherein the movable part includes:

an inner member disposed inside the housing to control the circuit; and

an outer member being a discrete piece from the inner member, and exposed outside the housing to be manipulated by the user, and

wherein the outer member includes a shaft part inserted through the penetration hole.

2. The switch of claim 1 ,

wherein the movable part pivots on the shaft part,

wherein the inner member has a fitting hole,

wherein the shaft part has a first end inserted into the fitting hole, and

wherein the first end of the shaft part is fitted into the fitting hole to cause the inner member to pivot integrally with the outer member.

3. The switch of claim 2 ,

wherein the movable part further includes a fixing member for fixing the outer member and the inner member,

wherein the outer member further includes a circular disc part provided at a second end of the shaft part, and

wherein, when the fixing member fixes the outer member and the inner member, a labyrinthine structure is formed between the circular disc part and the side face of the case member.

4. The switch of claim 3 ,

wherein the case member further includes a recessed part provided around the penetration hole to engage with the circular disc part, and

wherein the circular disc part has an outer face on substantially the same plane as the side face of the case member.

5. The switch of claim 3 ,

wherein, when the fixing member does not fix the outer member and the inner member, the outer member is allowed to move in an axial direction with respect to the inner member with retaining the first end of the shaft part to fit into the fitting hole.

6. The switch of claim 5 ,

wherein the inner member further includes:

a circular ring part having a fitting hole provided at its center; and

an actuation part extending from the circular ring part toward a radial direction, and

wherein, before the cover member closes the opened front face of the case member, the outer member pivoting with the first end of the shaft part fitted into the fitting hole enables a tip of the actuation part to be exposed out of the opened front face of the case member.

7. The switch of claim 6 ,

wherein the case member includes a receiving part on its inner side to engage with the circular ring part, and

wherein the circular ring part is engaged with the receiving part to enable the fitting hole to be positioned substantially coaxially with the penetration hole.

8. The switch of claim 1 ,

wherein the movable part linearly moves along an axial direction of the shaft part,

wherein the inner member includes an abutting part for abutting the shaft part, and

wherein, when the outer member is linearly moved into the housing, the shaft part presses against the abutting part to linearly move the inner member integrally with the outer member.