Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1998-02-19
1999-03-09
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335201, 218155, H01H 6702
Patent
active
058806580
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electromagnetic switching device having an electromagnet for operationally switching currents in the load range.
BACKGROUND INFORMATION
An electromagnetic switching device of the generic type is described in German Patent No. 37 13 412 A1. The contact bridge carrier is actuated here using a toggle by a contactor magnet arranged laterally offset with respect to the contact bridge carrier. The electromagnetic contactor drive and the instantaneous release are arranged parallel to one another on both sides of the longitudinal central axis of the contact bridge carrier. The contact springs which effect the contact pressure are supported against the housing base. A high short-circuit breaking capacity is achieved by providing extinction chambers of appropriately generous dimensions which are situated in the lower part of the housing, which is provided for mounting. However, this design entails a relatively large overall volume. The contactor magnet is fastened with its movable part to a yoke which is guided displaceably and from which a plunger projects in the direction of actuation of the contactor magnet against an operating rocker via which the contact bridge carrier can be actuated. Coupling the contactor magnet to the contact bridge carrier is therefore relatively complicated. The elements for transmitting force which are required for this purpose are exposed frequently to stresses in accordance with the switching rate, and can increase the risk of failure of the switch.
The electric switch described in German Patent No. 41 04 533 C2 is likewise of the generic type. The latter essentially comprises an arc housing and an operating or actuating mechanism housing coupled to the latter, in which the electromagnet and the instantaneous release are arranged parallel to one another. The instantaneous release is arranged in the middle relative to the contact bridge carrier, i.e. the longitudinal centre line of its striker pin for actuating the contact system is aligned with that of the contact bridge carrier. The electromagnet essentially comprises a fixed iron core, a movable iron core and a coil. Fastened to the movable iron core is a transmission component which, upon movement of the movable iron core, i.e. upon the application of current to the coil, presses on a beam which can pivot about a fixed axis of rotation and thereby releases the contact bridge carrier and effects the contact closure. Thus, the actuation of the contact bridge carrier by the electromagnet is not performed directly, but via various linkages or intermediate elements. Furthermore, the parallel arrangement of the release and of the electromagnet with respect to one another produces a relatively large overall volume.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an electromagnetic switching device of the type mentioned above which has a simple switching mechanism via the electromagnets and thus ensures a high reliability and service life (for example 10 million) for switching nominal currents, without impairing the protection by the instantaneous release against welding in the case of overcurrents in the overload range. According to the present invention, this is achieved because the electromagnet is arranged in the middle relative to the contact bridge carrier and is coupled directly to the latter, and in that the instantaneous release acts on the movable contact via a rocker. This solution advantageously utilizes the fact that during the service life of the switching device the switching rate for switching currents within the nominal range is substantially higher than that of the instantaneous release for protection against overcurrents. Consequently, the stresses on the components participating in the switching in the nominal current range are very much more frequent, and thus greater. Direct coupling of the electromagnet to the contact bridge carrier is advantageous. The actuation by the instantaneous release can be performed via a rocker withou
REFERENCES:
patent: 4307358 (1981-12-01), Haury et al.
patent: 4470028 (1984-09-01), Vayre et al.
patent: 4688011 (1987-08-01), Lemmer et al.
patent: 4973929 (1990-11-01), Duchemin
patent: 5635886 (1997-06-01), Pichard
Donhauser Peter
Drexler Johann
Holzer Wilhelm
Donovan Lincoln
Siemens Aktiengesellschaft
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