Gas circuit breaker of the resistance breaking type

Claim 2

A gas circuit breaker of resistance breaking type comprising: a main breaking unit (2) driven by a drive unit (9, 10, 29) to open and close the circuit; a resistor (3) and a pair of resistance contacts (17, 18) electrically connected in parallel with said main breaking unit; spring means (24, 24a) for storing spring force with the action of said drive unit to drive said main breaking unit to open the circuit; means (21) for coupling said spring means with a movable one (18) of said pair of resistance contacts so that said spring means acts, as a source of drive force, on said movable contact open said pair of resistance contacts; locking means (28; 61, 62, 64; 80) for locking said movable contact at a closing position where said pair of contacts are closed; releasing means (29, 31, 32; 68, 69, 68a;52, 78, 79) for releasing the lock effected by said locking means after current in said main breaking unit has been cut off; and means (20, 26; 51, 52) for transmitting the closing action of said main breaking unit by said drive unit to said movable contact to close said pair of resistance contacts.

Claim 3

A gas circuit breaker of resistance breaking type according to claim 1, which further comprises gas blow-out means (21, 27; 40, 41) for generating a gas stream with the opening action of said movable contact by said spring means, and guide means (23) for causing the gas stream generated by said gas blow-out means to act on said resistance contacts.

Claim 4

A gas circuit breaker of resistance breaking type comprising: at least two main breaking units (2) each including a fixed contact and a movable contact, said contacts being capable of selectively being closed or opened; bracket means (6) for supporting the movable contacts of said two main breaking units at its axially opposing end movably to be closed with or opened from their counterpart fixied contacts; insulating support means (5) fixedly supporting said bracket means; link mechanisms (9) each supported by said bracket means and having one end connected to the associated movable contact and the other end to be connectable to drive means; an electrical series connection of a resistor (3) and a resistance contact mechanism (17, 18), and electrically connected in parallel with each of said main breaking units, said resistance contact mechanism including a fixed resistance contact (17) and a movable resistance contact (18) supported by said bracket means movably to be closed with and opened from the fixed resistance contact; two spring means (24, 24A) disposed separately at both sides of said bracket means (6) and each being capable of being energized to store force useful for driving the associated movable resistance contact (18) to be opened from the fixed resistance contact (17); lever means (48, 48A) for energizing each of said spring means with the opening action of the associated main breaking unit; locking means (61, 62, 64) for locking said movable resistance contact at its closing position; releasing means (68, 69, 68a) for releasing the lock effected by said locking means after the current in each of said main breaking units is cut off; and means (51, 52) for transmitting the closing action by said driving means to move each of said movable resistance contacts into its closing position.

Claim 5

A gas circuit breaker of resistance breaking type comprising: at least two main breaking units (2) each including a fixed contact and a movable contact, said contacts being capable of selectively being closed or opened; bracket means (6) for supporting the movable contacts of said two main breaking units at its axially opposing end movably to be closed with or opened from their counterpart fixied contacts; insulating support means (5) fixedly supporting said bracket means; link mechanisms (9) each supported by said bracket means and having one end connected to the associated movable contact and the other end to be connectable to drive means; an electrical series connection of a resistor (3) and a resistance contact mechanism (17, 18), and electrically connected in parallel with each of said main breaking units, said resistance contact mechanism including a fixed resistance contact (17) and a movable resistance contact (18) supported by said bracket means movably to be closed with and opened from the fixed resistance contact; two spring means (24, 24A) disposed separately at both sides of said bracket means (6) and each being capable of being energized to store force useful for driving the associated movable resistance contact (18) to be opened from the fixed resistance contact (17); lever means (48, 48A) for energizing each of said spring means with the opening action of the associated main breaking unit; locking means (61, 62, 64) for locking said movable resistance contact at its closing position; releasing means (68, 69, 68a) for releasing the lock effected by said locking means after the current in each of said main breaking units is cut off; and means (51, 52) for transmitting the closing action by said driving means to move each of said movable resistance contacts into its closing position.

Claim 6

The gas circuit breaker of resistance breaking type according to claim 3, wherein said link mechanisms each includes a lever (48, 48a) having a rotary shaft (51, 49) to which said lever means being connected.

Claim 7

The gas circuit breaker of resistance breaking type according to claim 4, wherein said spring means each has an end connected through rod means (45) to the associated movable resistance contact and the other end provided with a movable resistance contact and the other end provided with a movable spirng seat (25; 46), said lever means via said movable spring seat with the opening action of said drive means, and said transmitting means includes a flange secured to said rod means and capable of being engaged with and driven by said lever means with the closing operation of said driving means.

Claim 8

The gas circuit breaker of resistance breaking type according to claim 4, wherein said releasing means has one end connected to said rotary shaft (49, 51) and the other end connected with a play to said locking means, the lock effected by said locking means being released by said releasing means when said link mechanism, is operative.