Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1987-07-15
1989-03-07
Goldberg, E. A.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 20, H01H 7500
Patent
active
RE0328820
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a remote control system circuit breaker whose movable contactor is held on or off by virtue of a bistable electromagnetic apparatus.
2. Background Art
Conventionally, this kind of circuit breaker uses a toggle mechanism so that a handle and a movable contactor are held on or off and an operating force necessary for the handle is subjected to the maximum load at the center of handle stroke by virtue of a spring force of a toggle mechanism. Hence, in a case of driving such circuit breaker by use of a remote controlling electromagnet unit, since the attraction thereof is inversely proportional to the square of the width of the main gap, the maximum load needs be applied at the center of handle stroke, whereby the power of the electromagnetic unit should be increased. Thus, such a circuit breaker has a disadvantage in that the electromagnetic unit is large-sized, or the exciting current for the coils is increased.
Also, the conventional circuit breaker contains therein two electromagnets for serving to turn on or off the breaker, thereby having a disadvantage in that the circuit breaker is inevitably large-sized.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the invention is to provide a remote control system circuit breaker which is capable of reducing the load on the remote controlling electromagnet unit and miniaturizing the circuit breaker as a whole.
This invention is characterized in that a trip link, a latch link, a movable contact, an operating link and a handle are interlocked with each other, the trip link and latch link providing return springs respectively and latched by the spring force thereof so that the on-off hold of the movable contactor supported by the latch link depends on a holding force of a bistable polarized electromagnet for remote control connected with the handle. Such construction, when no bistable electromagnet is provided, has no holding force for holding the handle on or off so that the handle operating force is equal to zero, but a spring force of a contact pressure being applied when the circuit breaker is on, and that of a return spring for the latch link when off, merely generate for force to restore the handle from the on or off position. In other words, since the handle is zero of its operating force at the center of handle stroke, the bistable type polarized electromagnet unit usable so that the attraction of its permanent magnet is set to enable the handle to be held at its on or off position against spring pressures of the contact pressure apply spring and return spring. Hence, the attraction of the electromagnet magnet for on-operation and off-operation need only overcome the latching attraction of the same. As a result, the handle may be hand-operated with a light touch and the electromagnet is subjected to less load than the conventional one to thereby be small-sized and save power consumption. Furthermore, only one electromagnet is sufficient for use to enable the circuit breaker to be largely reduced in [being applied] physical size.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a preferred embodiment of the circuit breaker of the invention;
FIG. 2 is a side view thereof;
FIG. 3 is a front view of the same;
FIG. 4 is a rear view of the same;
FIG. 5 is a partially sectional side view of the FIG. 1 embodiment, from which the inner casing is removed;
FIG. 6 is a perspective exploded view of the FIG. 1 embodiment;
FIG. 7 is a perspective exploded view of a movable contactor, an electromagnet unit, and a mechanism;
FIG. 8 is a perspective exploded view of a bistable type polarized electromagnet unit and a handle;
FIG. 9 is a partially sectional side view of the FIG. 1 embodiment in the on-condition;
FIG. 10 is a partially sectional side view of the FIG. 9 embodiment in the off-condition;
FIG. 11 is a partially sectional side view of the same in the trip condition by the bimetal;
FIG. 12 is a partially sectional side view of the same in the trip condition caused by the electromagnet uni
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Kondo Hideya
Yokoyama Youichi
Donovan L.
Goldberg E. A.
Matsushita Electric & Works Ltd.
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