US3908106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve and piston operative means for a circuit breaker
Assignee: Hitachi Ltd
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Filing: 1973-11-13
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Granted: 1975-09-23
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Expires: 1993-11-13
Abstract
Abstract A device comprising an operating piston disposed at one end of an operating rod for operating a circuit breaker, a cylinder for guiding the operating piston in its sliding movement, a circuit making means adapted to provide a force for causing the operating rod to bring the circuit breaker to a circuit making position, a hook means adapted to be brought into engagement with the operating rod to maintain the circuit breaker in a circuit breaking position when instructions to break the circuit are given and released from engagement with the operating rod when instructions to make the circuit are given, a fluid introducing valve means for supplying an operating medium to the operating piston to move the same in a circuit breaking direction when instructions to break the circuit are given, and communication ports formed in a side wall of the cylinder to discharge therethrough from the cylinder to a lower pressure section the operating medium acting on the operating piston at least at the terminating stages of the circuit breaking operation, whereby the operating piston can be moved at fill speed. The fluid introducing valve means includes a fluid introducing valve disposed in the proximity of the operating piston and adapted to move toward the operating piston when brought to an open position, with its back being exposed to the operating medium at all times. By this arrangement, the device is capable of operating the circuit breaker at high speed even if the circuit breaker is under a high load and it has a large contact parting distance.
Inventors
- 👤 Kunio Hirasawa
- 👤 Seizo Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:44
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/28; H01H33/30; H01H33/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
A circuit breaker operating device comprising an operating piston connected to one end of a pivotal lever attached to an operating rod which operates a circuit breaker, cylinder means for guiding said operating piston to move in sliding motion, circuit making means providing a force which causes said operating rod to bring the circuit breaker to a circuit making position, hook means removably engaging said pivotal lever attached to said operating rod and maintaining the circuit breaker in a circuit breaking position when instructions to break the circuit are given, said hook means being released from engagement with said pivotal lever when instructions to make the circuit are given, fluid introducing valve means having a valve seat formed on an end plate of said cylinder means and a fluid introducing valve for supplying an operating medium to said operating piston to move the same in a circuit breaking direction when instructions to break the circuit are given, and communication ports formed in a side wall of said cylinder means for discharging from said cylinder means to a lower pressure section the operating medium acting on said operating piston at least at the terminating stages of the circuit breaking operation when said operating piston is moved to open said communication ports.
Claim 2
Dependent Claim
210 words
A circuit breaker operating device comprising an operating piston connected to one end of a pivotal lever attached to an operating rod which operates a circuit breaker, cylinder means for guiding said operating piston to move in sliding motion, circuit making means providing a force which causes said operating rod to bring the circuit breaker to a circuit making position, hook means removably engaging said pivotal lever attached to said operating rod and maintaining the circuit breaker in a circuit breaking position when instructions to break the circuit are given, said hook means being released from engagement with said pivotal lever when instructions to make the circuit are given, fluid introducing valve means having a valve seat formed on an end plate of said cylinder means and a fluid introducing valve for supplying an operating medium to said operating piston to move the same in a circuit breaking direction when instructions to break the circuit are given, and communication ports formed in a side wall of said cylinder means for discharging from said cylinder means to a lower pressure section the operating medium acting on said operating piston at least at the terminating stages of the circuit breaking operation when said operating piston is moved to open said communication ports.
Claim 3
Dependent Claim
65 words
A circuit breaker operating device as set forth in claim 1, wherein said operating piston is formed therein with a small hole, said small hole being closed by said fluid introducing valve means at least at the initial stages of the circuit breaking operation and venting therethrough the operating medium from said cylinder means when the circuit breaker is brought to its circuit making position.
Claim 4
Dependent Claim
114 words
A circuit breaker operating device as set forth in claim 1, wherein said fluid introducing valve supplies said operating medium to said operating piston disposed in the proximity of said operating piston and is moved toward said operating piston when brought to an open position; and said fluid introducing valve means also has a second piston connected to said fluid introducing valve and normally exposed to said operating medium such that said fluid introducing valve is biased by the pressure of operating medium to move to a closed position, and a third piston receiving a supply of operating medium through a change-over valve and which moves said fluid introducing valve to its open position.
Claim 5
Dependent Claim
40 words
A circuit breaker operating device as set forth in claim 3, wherein said fluid introducing valve and said second piston are disposed in spaced juxtaposed relationship, with the space between them being filled with the operating medium at all times.
Claim 6
Dependent Claim
132 words
A circuit breaker operating device as set forth in claim 1, wherein said fluid introducing valve supplies said operating medium to said operating piston disposed in the proximity of said operating piston and moves toward said operating piston when brought to an open position; and said fluid introducing valve means also has a second piston connected to said fluid introducing valve, said second piston normally exposed to said operating medium on one surface thereof such that said fluid introducing valve is biased by the pressure of said operating medium to move to a closed position and receives a supply of operating medium through a change-over valve to the other surface thereof such that said fluid introducing valve is biased by the pressure of said operating medium to move to a closed position.
Claim 7
Dependent Claim
193 words
A circuit breaker operating device as set forth in claim 1, in which said fluid introducing valve supplies said operating medium to said operating piston and said fluid introducing valve means further has a fluid chamber formed on a side of said fluid introducing valve to which said operating medium is supplied and filled with said operating medium at all times, a fluid supply port formed in a portion of a side waLl of said fluid chamber for supplying therethrough said operating medium to said fluid chamber, said side wall of said fluid chamber being cylindrical in shape, and a cylindrical partition wall arranged within said fluid chamber such that the interior of said partition wall communicates with said cylinder through said fluid introducing valve when the latter is open, said partition wall being formed therein with a plurality of communication ports and eccentrically disposed in said fluid chamber such that the clearance between said partition wall and a side of the side wall of said fluid chamber at which said fluid supply port is formed is greater than the clearance between said partition wall and the opposite side of said fluid chamber.
Claim 8
Dependent Claim
82 words
A circuit breaker operating device as set forth in claim 1, further comprising a casing arranged to house therein said cylinder means with a small clearance being disposed between said casing and said cylinder means, and an exhaust valve means mechanically connected to said hook means and adapted to vent the for venting said operating medium therethrough from said casing when said hook means is brought into engagement with the operating rod to keep the circuit breaker in the circuit breaking position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |