High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Arc chute assembly
Reexamination Certificate
1999-11-30
2001-02-20
Donovan, Lincoln (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Arc chute assembly
C218S151000, C335S201000
Reexamination Certificate
active
06191377
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates in general to an electromagnetic switching device, and in particular, to a high-capacity contactor, having switch contacts which are arranged within interrupter chambers formed in an interrupter housing, and having a de-ionization device in the form of an arcing chamber assigned to each interrupter chamber having a switch contact.
RELATED TECHNOLOGY
An electromagnetic switching device having an arcing plate arrangement, which is mounted in a housing that has a removable cover is known from German Utility Model No. 85 31 352 U1, for example, where the arcing plates are inserted in grooves in the housing walls and held fast using comb-shaped rubber parts when the cover is installed, with each packet of arcing plates forming an arcing chamber. European Patent Document No. 0505 794 B1 describes an electromagnetic switching device having a multipart housing, in which switch contacts are mounted in the interrupter chambers of a housing part enclosing an interrupter chamber and each switch contact has a de-ionization device in the form of an arcing chamber having arcing plates and a commutating plate, the arcing plates forming the arcing chamber being clamped in the housing that encloses the interrupter chambers using the commutating plate. (‘German Patent Document Offenlegungsschrift’) No. 11 96 750 describes an electric switching device in which the arcing plates forming the arcing chamber are individually held in the top portion of the housing wall covering the interrupter chamber.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an electromagnetic switching device with simplified fastening of the arcing chambers, formed by arcing plates, in the switching device, i.e., in the housing enclosing the interrupter chambers, and having simpler and more reliable assembly without additional separate parts for fastening the arcing chambers in the space provided.
The present invention provides an electromagnetic switching device, in particular a high-capacity contactor, including an interrupter chamber housing with six interrupter chambers opening in an upward direction. A cover is provided for enclosing the topside of the interrupter chambers. A respective interrupter contact is disposed in each interrupter chamber. A respective arcing chamber associated with each interrupter chamber is provided. Each arcing chamber includes a plurality of arcing plates arranged so as to form a packet. The uppermost arcing plate, working as a shield plate of each arcing chamber has at least one clip bent upward and recesses corresponding to the clips of the arcing chambers are formed on the underside of the cover, and the arcing chambers can be fastened to the cover by inserting the clips in the recesses, forming a positive-locking joint. The arcing chambers are fastened to the underside of the cover of the interrupter chambers according to the present invention without additional means, clamping parts, springs or the like. Pre-manufacturing of the arcing chamber as a module made up of arcing plates is made possible according to the present invention, and this arcing chamber can then be joined to the cover in an additional assembly operation. The cover can then be mounted on the switching device, i.e., the interrupter chamber, together with the arcing chambers in order to close the switching device. The present invention allows the pre-manufactured arcing chambers to be mounted on the cover accurately and quickly, avoiding short-circuits, seizing or damage during subsequent assembly operations.
According to an exemplary embodiment of the present invention, a pair of clips is formed on the opposite sides and approximately in the center of the uppermost arcing plate acting as a shield plate of an arcing chamber, and projecting essentially at a right angle to the plane of the arcing plates. A pair of corresponding recesses is formed for each arcing chamber to be attached on the underside of the cover.
In order to allow accurate positioning and assembly of the arcing chambers on the cover, it is furthermore proposed that the clips have an insertion groove used to insert and guide the clip via a corresponding central ridge across the recess, formed on the underside of the cover.
The clips have a fork-shaped design according to the present invention, so that their two tines can elastically bend in each direction. In an embodiment of the present invention, the clips may have a serration on their outer edges, so that when they are inserted in the recess of the cover, they can be inserted with a slight clamping action and there is also space for yielding in the groove area.
In order to achieve secure guidance and fastening in the recess even in the direction across the outer edges of the clips, in an embodiment of the present invention both sides of the recesses have projecting insertion wedges adjacent to one side of the central ridge for the insertion and elastic fastening of the clips in the arcing chamber. This makes it possible to easily insert both clips of a clip pair parallel to one another and turned toward one another in the case, for example, of insertion wedges mounted on opposite external sides of two corresponding recesses, and thus to achieve a flexible clamping effect for secure fastening of the clips and thus of the arcing chamber to the cover.
In order to allow good pressure relief and venting of gases from the arcing chamber, the uppermost arcing plate acting as a shield plate is perforated, at least in certain areas. Thus gases can escape, but particles are retained. The front edge of the shield plate is preferably bent upward and provided with holes, thus forming a venting path.
Furthermore it is proposed that the shield plate be provided with a screw block in its area opposite the upward bend in order to allow the arcing chamber to be screwed to the bottom of the cover if needed in addition to the positive-locking fastening and positioning.
For this purpose, the cover has a threaded hole on the underside to accommodate a screw. This arrangement according to the present invention is also characterized by the fact that in each of two symmetrical rows there are three areas to accommodate arcing chambers on the underside of the cover, and each of these areas has an opening adjacent to the cover edge in which the bent edge of the shield plate can be inserted.
REFERENCES:
patent: 3873797 (1975-03-01), Hannich
patent: 4011425 (1977-03-01), Gryctko
patent: 4254316 (1981-03-01), Landow
patent: 4506243 (1985-03-01), Okako et al.
patent: 4684772 (1987-08-01), Lehman
patent: 4945327 (1990-07-01), Siemens
patent: 5635886 (1997-06-01), Pichard
patent: 11 96 750 (1965-07-01), None
patent: 73 27 820 (1973-11-01), None
patent: 85 31 352 (1986-01-01), None
patent: 85 31 354 (1986-01-01), None
patent: 0 505 794 (1992-09-01), None
Bolz Jakob
Kern Helmut
Roesner Norbert
Donovan Lincoln
Kenyon & Kenyon
Moeller GmbH
Nguyêñ Tuy{tilde over (e)}n
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