High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Patent
1994-05-25
1996-04-30
Kincaid, Kristine L.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
218139, 218154, 218155, H01H 3342
Patent
active
055127240
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a vacuum switch with the following features: switching tube; a pole operating unit which receives the vacuum switching tube at one of its ends and consists of a carrier, a lever arrangement which changes the direction of movement of the drive device and of a connection device for connecting a movable operating plunger of the vacuum switching tube to an external conductor; part and two legs; attached at one of its ends to the central part of the carrier; receive the ends of a bolt which guides the operating plunger of the vacuum switching tube linearly and transmits an operating force; direction-changing lever arrangement and a contact force spring which is to be tensioned when the vacuum switching tube is switched on and a counterbearing which supports the contact force spring is arranged between the legs of the carrier,
A vacuum switch with these features has been disclosed in U.S. Pat. No. 4,654,494. On the basis of the above, the invention is based on the object of designing the pole operating unit in such a way that its individual parts can be assembled easily and that the pole operating unit is as lightweight as possible and yet has a high degree of mechanical strength.
This subject is achieved according to the invention by means of the following further feature: bending; fashion and is of plate-shaped construction with a width which corresponds to the distance between the legs in the state of rest; against the legs of the carrier, pins for engaging in associated holes of the legs are arranged and the connection device is constructed as an assembly which connects and strengthens the legs.
On the basis of the features of the invention, in the pole operating unit the counter-bearing of the contact force spring can be pushed in, after the legs of the carrier have been bent apart, until the pins can engage in the openings assigned to them. If the expansion force applied to the legs is then removed, the counterbearing is positively attached between the legs of the carrier. It is therefore unnecessary to provide additional attachment elements. It is known that the legs of the carrier can be made flexible by suitably selecting the thickness of the material. The carrier is therefore a relatively thin and lightweight part. Nevertheless, this part is capable of fulfilling its object of guiding the direction-changing lever arrangement reliably because the connection device connects the legs to one another and, as a result, a closed, stiff frame is formed.
A base, with a U-shaped cross-section, for a vacuum switching tube with a connection device which connects the legs is known per se (U.S. Pat. No. 4,684,771). However, a strengthening effect of a connection device and the rigidity of the base are not factors here because the said base only relates to the transmission of current from the movable connection bolt of the vacuum switching tube to the fixed connection device.
By means of further features, the vacuum switch according to the invention can be improved further. In particular, holes can be provided in the legs of the carrier as access opening to a clamping device on the movable operating plunger of the vacuum switching tube. Therefore, the vacuum switching tube can be installed or removed when the pole operating unit is otherwise completely assembled. A contribution can also be made to the strengthening of the pole operating unit by the support insulator being attached near to the end, facing the vacuum switching tube, of the carrier with the inclusion of an insulating support strut on the central part of the carrier, and by the edge of the central part being of rounded off and/or bent at the end of the carrier. The rounding-off or bending at the central part of the carrier is made easier by the relatively small crosssection of the material and leads both to local strengthening and also to an advantageous control of the course of the electrical field in this area.
Therefore, the support strut can be connected here to the central part of the carrier by positive engagement. This can
REFERENCES:
patent: 3632933 (1972-01-01), McClain
patent: 4419553 (1983-12-01), Ohshita et al.
patent: 4654494 (1987-03-01), Wuthrich
patent: 4684771 (1987-08-01), Wuthrich
patent: 5055640 (1991-10-01), Lippi et al.
patent: 5422450 (1995-06-01), Miyazawa et al.
Binder Manfred
Schmidt Detlev
Steinemer Norbert
Friedhofer Michael A.
Kincaid Kristine L.
Siemens Aktiengesellschaft
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