Sealed relay
Conventional example is arranged simply to turn a circuit on/off, and not to changeover connection. Sealed relay 1 comprises: insulating tube 2 ; first relay connect portion 4 attached to one end of insulating tube 2 , and provided with first contact 3 on inside surface; second relay connect portion 5 disposed in confrontation with first relay connect portion 4 in insulating tube 2 ; movable member 7 disposed movably between first and second relay connect portions 4 and 5 , and provided with second contact 6 contacting with first contact 3 when moved toward the first relay connect portion; and operating mechanism to move the movable member. Third relay connect portion 10 including third contact 9 is provided between the second and first relay connect portions. Movable member 7 includes a fourth contact contacting with the third contact when the first and second contacts are out of contact from each other.
1. A sealed relay comprising: an insulating tube; a first relay connect portion attached to an opening portion in one end of the insulating tube, and provided with a first contact on an inside surface of the first relay connect portion; a second relay connect portion disposed with a predetermined spacing from the first relay connect portion; a movable member disposed movably between the first and second relay connect portions, and provided with a second contact contacting with the first contact when the movable member is moved toward the first relay connect portion; an operating mechanism to move the movable member in a direction for contact and separation between the contacts; and a bellows to seal an inside of the insulating tube airtightly;
the sealed relay being arranged to set the first contact and the second contact in contact with each other by moving the movable member with the operating mechanism and thereby to connect the first and second relay connect portions electrically through the movable member and the bellows;
the sealed relay further including a third relay connect portion including a third contact and being provided between the second relay connect portion and the first relay connect portion; and
the movable member being provided with a fourth contact contacting with the third contact when the first contact and the second contact are set out of contact from each other;
the bellows having a double structure including an inner circumferential bellows and an outer circumferential bellows, the inner circumferential bellows being configured to have a property for air tight sealing, and the outer circumferential bellows being configured to have a property for electric conduction.
2. The sealed relay as claimed in claim 1 , wherein the third and fourth contacts are ring-shaped contacts having substantially equal diameters.
3. The sealed relay as claimed in claim 2 , wherein the first and second contacts are ring-shaped contacts having diameters substantially equal to the diameters of the third and fourth contacts.