Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1990-05-24
1991-05-07
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01H 3312
Patent
active
050138758
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a contact configuration for a low-voltage circuit-breaker having main contacts for conducting a continuous current and arcing contacts for igniting an arc in the entrance region of an arc quench chamber, and also having an arc conducting piece manufactured as a one-piece stamped, flexural part made of ferromagnetic material for transferring an arc occurring on the main contacts over to the arcing horn.
A contact configuration of this type has become known as a result of the DE-A-35 39 673. It provides for manufacturing the arc conducting pieces as cast parts or as stamped, flexural parts, whereby a massive, that is a solid design is considered advantageous. It has also been proven that arc conducting pieces designed as cast parts ensure the mode of operation that is aspired to.
To simplify the manufacturing process and to reduce production expenditure, however, it would be desirable to make use of the possibility that is likewise indicated, of designing the arc conducting pieces as stamped, flexural parts. However, it turns out that one only attains the mode of operation with a lesser degree of perfection.
Starting from here, the invention is directed toward the task of creating an arc conducting piece that can be manufactured as a stamped, flexural part, which even with a simple design fulfills the task of carrying arcs that develop on the main contacts quickly and reliably to the arcing horn.
This is achieved according to the invention in that the arc conducting piece designed as a one-piece, stamped, flexural part has a base shank extending more or less parallel to the row of main contacts and used for mounting on the support of the main contacts, and an arc conducting shank, which originates at the end of the base shank that is distant from the arcing horn, and is linked up at an angle to this end, whereby the base shank has two separated base shanks which are separated by an incision and which have a mutual displacement corresponding to a gradation of the mounting surface of the arc conducting piece. In contrast to the known arc conducting piece mentioned the new arc conducting piece thus does not have a closed, triangular form. Nevertheless, it was determined that one attains the same success [with the new arc conducting piece] as one does with the triangular and massive arc conducting piece.
To achieve a good transition of the arcs to the arcing horn, it is recommended to provide the outer end part of the arc conducting shank with a bent design that is more or less parallel to the arcing horn.
The mounting surface for the arc conducting pieces that is provided on the support of the main contact can possibly have a graduated design. To produce a reliable mounting for the arc conducting pieces, it is therefore beneficial to provide the side of the arc conducting piece used for mounting with a corresponding, graduated shape as well. The arc conducting piece provided according to the invention and designed as a stamped, flexural part can likewise be given this graduated shape, by forming partial base shanks that are separated by a slit and are offset from one another.
The invention is explained more closely in the following based on the exemplified embodiment depicted in the Figures.
FIG. 1 shows in a section a pole of a low-voltage circuit-breaker with an arc conducting piece.
FIG. 2 shows the intersection II--II of FIG. 1, whereby the left and right sections of FIG. 2 illustrate different specific embodiments.
Details of the arc conducting piece are depicted in FIGS. 3, 4 and 5, each showing views at right angles to one other.
The contact configuration according to FIG. 1 comprises in a well-known way a stationary part 2 and a movable part 3. An insulating block 4 is used as a support for the stationary part 2 of the contact configuration 1. An upper connecting bar 5, which is used at the same time as a support '' for a stationary main contact and for this purpose is provided with a contact facing 6 or a larger number of such contact facings, is mounted on this insulating bloc
REFERENCES:
patent: 2372045 (1945-03-01), Armstrong
patent: 3784775 (1974-01-01), Gryctko
Macon Robert S.
Siemens Aktiengesellschaft
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