Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Reexamination Certificate
1999-12-01
2001-05-29
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
C335S127000, C335S129000, C335S131000, C335S203000
Reexamination Certificate
active
06239679
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic switching device comprising a movable contact-holder fitted with a set of contact bridges that operate in conjunction with fixed contacts, also comprising an electromagnet composed of a coil, a fixed framework and movable framework, the movable framework of the electromagnet being associated with the contact-holder and causing the contact-holder to move in translation in order to open or close the contacts.
2. Discussion of the Background
French patent FR 2518308 discloses a contactor-type electromagnetic switching device comprising an electromagnet powered by an alternating current. The contact-holder of the contactor has a lower cavity containing the movable framework of the electromagnet, the movable framework being fastened by means of a pin passing through the framework and introduced into the body of the contact-holder on each side of the cavity. The movable framework of the electromagnet is the type of E-shaped magnetic circuit commonly used for electromagnets powered by alternating currents and the way the contact-holders are assembled is consequently appropriate to the invention. However, this mode is difficult to implement for the blade-type movable framework used in electromagnets powered by direct currents, the blade being too thin to allow a fastening pin to pass through it.
U.S. Pat. No. 5,281,937 discloses a contactor-type electromagnetic switching device comprising a movable framework of an electromagnet consisting of a plane blade whose shape is suitable for it to be fastened to the mobile contact-holder of the contactor by means of elastic clipping feet provided on the contact-holder. However, this fastening method cannot be adapted directly to a movable framework consisting of an E-shaped magnetic circuit.
SUMMARY OF THE INVENTION
The invention thus relates to an electromagnetic switching device in which the different types of movable electromagnet frameworks (particularly depending on whether they are AC or DC powered) may be assembled using the same movable contact-holder, this associations being advantageously achieved rapidly, thereby allowing a considerable reduction in the number of different parts required to manufacture an entire range of contactors.
According to the invention the switching device comprises a movable contact-holder fitted with a set of contact bridges and includes an electromagnet composed of a coil, a fixed framework and a movable framework. This movable framework is fitted by being clipped onto the movable contact-holder by assembling means suitable for both direct and indirect assembly. Said assembling means comprise at least one elastic clipping foot on the movable contact-holder. For example, assembly is said to be direct when the movable framework of the electromagnet is a magnetic blade comprising direct assembling means composed of two pins on the blade that clip directly into the elastic feet of the movable contact-holder. Assembly is said to be indirect when the movable framework of the electromagnet is, for example, a movable magnetic circuit comprising indirect assembly means composed of an intermediary part constructed as part of said magnetic circuit that can be clipped into the elastic feet of the movable contact-holder.
REFERENCES:
patent: 3824509 (1974-07-01), McGary
patent: 5281937 (1994-01-01), Young
patent: 6040750 (2000-03-01), Pfab
patent: 2027136 (1972-04-01), None
patent: 2 259 429 (1975-08-01), None
patent: 2 737 603 (1997-02-01), None
Comtois Patrick
Larcher Patrick
Moreux Alain
Perrocheau Regis
Barrera Ramon M.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Schneider Electric Industries SA
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