Sliding switch with lubricant and method for manufacturing the same

1. A switch comprising:

at least one stationary contact;

at least one movable contact slidable on said at least one stationary contact and configured to be electrically connected to and disconnected from said at least one stationary contact;

lubricant provided between said at least one stationary contact and said at least one movable contact;

said at least one stationary contact having a contact surface which is configured to contact said at least one movable contact, said contact surface having zigzagged ridges which are so dimensioned such that the contact surface is able to retain the lubricant and to be electrically connected to said at least one movable contact;

a pressing unit configured to press said at least one movable contact toward said at least one stationary contact; and

an electrical insulator projecting from said at least one stationary contact and configured to prevent said at least one movable contact from electrically contacting said at least one stationary contact.

2. A switch according to claim 1 , wherein a maximum height of the zigzagged ridges is at least 2 μm and at most 8 μm.

3. A switch according to claim 1 , wherein said at least one stationary contact comprises first and second stationary contacts and wherein said at least one movable contact is configured to electrically connect and disconnect said first and second stationary contacts.

4. A switch according to claim 1 , wherein said lubricant is lubricating oil.

5. A switch according to claim 1 , wherein said at least one movable contact is rotatable to slide on said at least one stationary contact.

6. A switch according to claim 5 , wherein said at least one stationary contact extends along an arc.

7. A switch according to claim 1 , wherein said at least one movable contact has a tip end which is configured to slide on said at least one stationary contact and which has a rounded cross-section taken along a sliding direction of said at least one movable contact.

8. A switch according to claim 1 , wherein said at least one stationary contact comprises first and second stationary contacts which are provided opposite sides with respect to said at least one movable contact, respectively.

9. A switch according to claim 1 , wherein said zigzagged ridges are made by blowing particles to said contact surface.

10. A switch according to claim 1 , wherein said zigzagged ridges are made by grinding said contact surface using particles.

11. A switch according to claim 1 , wherein said at least one movable contact has a surface which is configured to contact said contact surface of said at least one stationary contact and which does not have a rough surface.

12. A switch comprising:

at least one stationary contact;

movable contact means for sliding on said at least one stationary contact and being electrically connected to and disconnected from said at least one stationary contact;

lubricating means for lubricating between said at least one stationary contact and said movable contact means;

said at least one stationary contact having a contact surface which is configured to contact said movable contact means, said contact surface having zigzagged ridges which are so dimensioned such that the contact surface is able to retain the lubricating means and to be electrically connected to said movable contact means;

pressing means for pressing said at least one movable contact means toward said at least one stationary contact; and

electrical insulation means projecting from said at least one stationary contact for preventing said at least one movable contact means from electrically contacting said at least one stationary contact.

13. A switch comprising:

at least one stationary contact;

at least one movable contact slidable on said at least one stationary contact and configured to be electrically connected to and disconnected from said at least one stationary contact;

lubricant provided between said at least one stationary contact and said at least one movable contact;

either one of said at least one stationary contact or said at least one movable contact having a contact surface which is configured to contact another of said at least one stationary contact or said at least one movable contact, said contact surface having zigzagged ridges which are so dimensioned such that the contact surface is able to retain the lubricant and to be electrically connected to said another of said at least one stationary contact or said at least one movable contact;

a pressing unit configured to press said at least one movable contact toward said at least one stationary contact; and

an electrical insulator projecting from said at least one stationary contact and configured to prevent said at least one movable contact from electrically contacting said at least one stationary contact.

14. A switch comprising:

at least one stationary contact;

at least one movable contact slidable on said at least one stationary contact and configured to be electrically connected to and disconnected from said at least one stationary contact;

lubricant provided between said at least one stationary contact and said at least one movable contact;

said at least one stationary contact having a contact surface which is configured to contact said at least one movable contact, said contact surface having zigzagged ridges, a maximum height of the zigzagged ridges being at least 2 μm and at most 8 μm;

a pressing unit configured to press said at least one movable contact toward said at least one stationary contact; and

an electrical insulator projecting from said at least one stationary contact and configured to prevent said at least one movable contact from electrically contacting said at least one stationary contact.

15. A switch comprising:

at least one stationary contact;

at least one movable contact slidable on said at least one stationary contact and configured to be electrically connected to and disconnected from said at least one stationary contact;

lubricant provided between said at least one stationary contact and said at least one movable contact;

said at least one stationary contact having a contact surface which is configured to contact said at least one movable contact, said contact surface having zigzagged ridges which are made by blowing particles to said contact surface or by grinding said contact surface using particles;

a pressing unit configured to press said at least one movable contact toward said at least one stationary contact; and

an electrical insulator projecting from said at least one stationary contact and configured to prevent said at least one movable contact from electrically contacting said at least one stationary contact.