Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Reexamination Certificate
2000-12-13
2003-04-29
Barrera, Ramon M (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
C335S127000, C335S132000, C200S245000, C200S246000, C200S247000
Reexamination Certificate
active
06556110
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a switching device having an arcing chamber assembly with two opposite, elongated side walls by means of which an internal area is formed in which a slide is mounted such that it can move in a movement direction transversely with respect to the longitudinal extent of the arcing chamber assembly, with a moving contact link, which is associated with fixed contacts, being held in an opening in the slide under the influence of a contact compression spring.
BACKGROUND INFORMATION
A switching device of this generic type is described in German Patent No. DE 693 02 599. This patent describes a multipole switch disconnector in which an isolating structure having disconnectable contacts is provided for each pole current path. Each pole current path contains two fixed contacts and two moving contacts arranged on a moving contact link, thus forming a double-interruption pole switch. A mechanism for opening and closing the contents acts on the moving contact link. This is done via a trigger, which is guided in a fixed cage. The cage is composed of insulating material and contains a base wall and side walls projecting from it at right angles, and is provided with windows whose sizes are such that they allow the movement of the contact link, in particular under the influence of the opening and closing mechanism, when an electrodynamic reaction occurs. Furthermore, the windows define an upper stop for the contact link. A contact compression frame is arranged in a central hollow of the cage, between the base wall of the cage and the contact link, and this hollow acts as a seat and a translational guide for the trigger. The trigger is thus guided against the inner surfaces of the side walls of the cage. The walls of the trigger have openings, whose sizes are such that, on the one hand, they allow the contact link to be inserted into the trigger and, on the other hand, allow angular movement of the link with respect to the trigger. The cage contains isolating vanes, which run in the longitudinal direction over a distance which is somewhat greater than the length of the contact link, and whose height is sufficient to produce a volume which contains the opening arcs.
This arcing chamber assembly is assembled in such a way that the trigger and slide are first introduced into the cage, and are then held in a defined position. In consequence, a window in the slide is accessible from the side under the webs which form the stops. Once the contact compression spring has been inserted from above through the hole in the slide into the cage, the moving switching piece is inserted into the space which is still free in the window, after compressing the spring by means of a stamp, and is finally rotated to its final operating position by rotating it through 90°.
The described assembly process is time-consuming and costly.
SUMMARY
An object of the present invention is to improve a switching device of the abovementioned type, having an arcing chamber assembly, which allows simple, in particular automated, assembly.
This object is achieved in that a passage whose length is at least equal to the length of the contact link is provided from the internal area to the exterior between the opposite longitudinal sides of the two side walls, through which passage the contact link can be inserted into the internal area in order to be held between the contact compression spring and the slide.
The example embodiment according to the present invention offers the advantage that those parts which are located in the arcing chamber assembly can be fitted into the internal area successively, in a movement direction from one side. The passage provides sufficient free space to allow assembly easily by means of industrial robots.
In an advantageous development of the present invention, the side walls have a stop for the slide.
It is also advantageous if the slide can be latched to the side walls, in order to create a simple connection in this way.
The slide advantageously has latching elements which engage in slots formed parallel to the movement direction of the slide. This means that there is a loose latched connection between the slide and the side walls, which allows the slide to move in the said movement direction.
If the two side walls are connected only on two opposite longitudinal sides by means of an arcing chamber base on which the contact compression spring is supported, this results in an embodiment in which the heat which is produced by the arcs in the internal area is dissipated well.
Owing to the arcing heat, the structure together with the two side walls can be distorted and deformed unacceptably. In order to avoid this, the arcing chamber assembly is advantageously embedded in the chamber system in such a way that the side walls are supported on the outside.
A further advantageous measure is provided by ribs on one housing part and/or on other subassemblies of the switching device, which project into the arcing chamber and thus ensure a spacing from the side walls.
REFERENCES:
patent: 3436497 (1969-04-01), Mading
patent: 4684772 (1987-08-01), Lehman
patent: 5075517 (1991-12-01), Spanio
patent: 5635886 (1997-06-01), Pichard
patent: 1 230 893 (1966-12-01), None
patent: 34 46 870 (1986-07-01), None
patent: 693 02 599 (1996-09-01), None
patent: 0 049 550 (1982-04-01), None
Niebler Ludwig
Strassburger Michael
Barrera Ramon M
Siemens Aktiengesellschaft
White & Case LLP
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