Electricity: circuit makers and breakers – Electric switch details – Actuators
Reexamination Certificate
1999-12-29
2001-05-01
Donovan, Lincoln (Department: 2832)
Electricity: circuit makers and breakers
Electric switch details
Actuators
C335S016000
Reexamination Certificate
active
06225585
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a movable switch contact arrangement for a low-voltage circuit breaker having contact levers and a contact lever holder, rotatably mounted using lateral mounting arms for opening and closing the switch, which holds a contact lever.
BACKGROUND INFORMATION
A switch contact arrangement of this type is described in German Patent Application No.35 39 786 1. The mounting arms are components of a mounting bracket dimensionally matched with a holding body for the contact levers. While this is a construction containing only metallic parts, switching contact arrangements, composed of a combination of molded plastic parts and metallic parts, are also known. In either case, these switch contact arrangements are dimensioned for a given number of contact levers. Therefore, for a series of low voltage circuit breakers including a plurality of rated currents, an equal number of different movable switch contact arrangements would be required.
SUMMARY OF THE INVENTION
An object of the present invention is to reduce the manufacturing cost for this plurality of switch contact arrangements.
According to the present invention, this object is achieved by the fact that the contact lever holder has a central part made up of a base body and at least one additional body attachable thereto, and the mounting arms are attached on both sides of the central part.
Thus two components can be uniformly used for all switch contact arrangements of a series of circuit breakers, e.g., the mounting arms and the base body. Only the additional bodies must be provided according to the width of the central body, which depends on the number of contact levers. A dimensionally appropriate assembly of the central part from its components can be facilitated by the fact that the base body and the additional body or bodies have connecting surfaces provided with projections and matching recesses. Thus the base body and the additional body or bodies can be assembled like building blocks prior to being permanently attached using connecting bolts.
The base body can have at least two threaded holes on each side, while the mounting arms and the additional bodies have through holes for connecting bolts, flush with the threaded holes. Therefore, the additional bodies only have to have through holes, which do not require high accuracy. This facilitates manufacturing of the additional bodies as cost-effective components.
REFERENCES:
patent: 4719325 (1988-01-01), Kroll et al.
patent: 35 39 786 (1987-05-01), None
patent: 295 03 327 U (1995-04-01), None
patent: 222 685 (1987-05-01), None
Donovan Lincoln
Kenyon & Kenyon
Nguyen Nhung
Siemens AG
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