Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1994-10-31
1997-03-04
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335167, H01H 7500
Patent
active
056083653
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a multi-pole low-voltage power switch with a switching shaft shared by all poles, with pole units each assembled from at least two switching chambers, and with a drive apparatus shared by all pole units.
A power switch of this kind is known, for example, from German Patent Document No. DE-A-35 42 746. The construction of power switches evident from this and from other patent documents is theoretically usable for power switches with any rated current. It is known how to construct this kind of power switch for a very high rated currents, which can exceed 4000 A by combining subassemblies that are dimensioned for a low rated current. This applies in particular to the actual current-carrying parts, such as contact systems and arc quenching chambers. A power switch constructed in this fashion is described in European Patent Document No. EP-A-0 320 412.
One feature of the power switch that has been expanded in a modular fashion to a high rated current is its significantly enlarged width, in certain circumstances, as compared to versions for lower rated currents. This entails the problem that normal and otherwise inconsequential dimensional deviations in the assembled components are added together, which can impair the operation of the power switch or even interfere with its proper assembly. The underlying objective of the present invention is to eliminate difficulties which occur because of dimensional deviations, both when the components of the switch are assembled, and as the switch interacts with a pull-out rack.
SUMMARY OF THE INVENTION
The present invention achieves this objective by dividing the switching shaft into shaft sections corresponding to the number of pole units. The shaft section of the center pole unit possesses at both ends a central pin and a lever, mounted close to the pin, with a through hole to receive a coupling bolt. Further, the peripheral shaft sections adjoining the central shaft section possess, at their end facing the central shaft section, a central aperture provided to receive the central pin and also, close to the central aperture, a lever with a through hole to receive the coupling bolt.
Thus, the switching shaft, an important component for the operation of the power switch, is not only easier to manufacture, but because of the subdivision is largely insensitive both to dimensional deviations in the lengthwise direction and to errors in the mutual alignment of the pole units.
Another problem of known switches is that the total width of the power switch can deviate considerably from a nominal value. The present invention eliminates this problem by providing a support for the framework of the power switch that is sized for the total width of all pole units, including a maximum oversize resulting from tolerances. The present invention further provides side walls that are applied at both lateral ends of the support. These innovations provide for a smooth interaction between the power switch and the pull-out rack.
Thus, regardless of the sum of the individual dimensions of its components, the width of the power switch is only affected by the tolerance of one part, namely the support.
The power switch can acquire properties that are also advantageous for use as a pull-out power switch because a displacement shaft is arranged in the power switch, extending transverse to its displacement direction and projecting laterally beyond the side walls, and is provided with gated levers. Further, the displacement shaft is mounted in the pole units and passes through apertures in the side walls with clearance. As a result, that actuation forces are transferred symmetrically to the power switch and act substantially where the force requirement exists, specifically at the breaker contacts of the pole units.
The present invention achieves a particularly tight-fitting coupling of the shaft sections that simultaneously ensures the desired compensation for alignment errors by providing at least one further lever for each shaft section, an
REFERENCES:
patent: 3786380 (1974-01-01), Harper
patent: 4347488 (1982-08-01), Mune et al.
patent: 5157366 (1992-10-01), Mullins et al.
patent: 5287077 (1994-02-01), Arnold et al.
Godesa Ludvik
Marquardt Ulrich
Donovan Lincoln
Siemens Aktiengesellschaft
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