Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – With protective means for switch or contacts
Patent
1999-05-20
2000-03-21
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
With protective means for switch or contacts
335131, 335132, 335270, 335274, H01H 716
Patent
active
060407506
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electromagnetic switching device including a magnet system comprising an armature and a yoke. The switching device further includes movable contact parts which are held in a movable contact carrier and form break contacts and make contacts with fixed contact parts. The yoke is, elastically suspended in the closing direction of the magnet system and, in the off position, and at a spacing w from the armature.
BACKGROUND INFORMATION
A switching device of the generic type is described in EP 0 358 050. Here, the contact carrier is elastically connected to the armature in such a way that the armature can be moved further without actuating the make contacts in the case of a welded break contact. The magnet system has a yoke which is suspended elastically in the closing direction of the magnet system. This elastic suspension, the elastic connection between the armature and the contact carrier and the elasticity of the movable contact parts are matched to one another in such a way that in the case of a welded break contact and a closed magnet system, the paths of resilience of armature and yoke are approximately the same size. In this way, upon welding of break contacts, the magnet system is closed in order to prevent the magnet coil from burning out. The armature is elastically connected to the contact carrier via a relatively long leaf spring. However, this requires a correspondingly large space in the housing of the switching device.
SUMMARY
It is an object of the present invention to create an electromagnetic switching device by means of which the conditions for positive-action contacts are satisfied in a simple way in accordance with the regulations of the professional association in the event of a malfunction.
The object is achieved by the elastic suspension of the yoke which permits a movement of the yoke as far as closure of the magnet system after the magnet system has been switched on in the case of a welded break contact. The elastic mounting is implemented using a volute spring inserted between the yoke and a coil form. The maximum resilience x of the volute spring in the OFF position is at least as large as the spacing w reduced by the break contact resilience d.
With reference to the overall height of the switching device, it is advantageous when the contact carrier is connected to the armature by a leaf spring in a narrowed-down region, and the narrowed-down region forms, with the housing of the switching device, cavities in which there are situated back-pressure springs acting on the contact carrier.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a diagram of the switching device according to the present invention in a sectional side view in the OFF position.
FIG. 2 shows the switching device according to FIG. 1 in the normal ON position.
FIG. 3 shows the switching device according to the present invention in the ON position in the case of a welded break contact.
DETAILED DESCRIPTION
FIG. 1 shows an electromagnetic switching device 1 according to the present invention in the OFF position. The switching device 1 includes a housing 2 (indicated diagrammatically) here, in which a contact carrier 3 is displaceably guided. The electromagnetic switching device 1 also includes a magnet system having an armature 4, a yoke 5 and a coil with a coil form 6. Held in the contact carrier 3 by means of contact press-on springs 7 are contact bridges 8 which form movable contact parts together with contacts (not shown) connected to them. The contact parts form break contacts 9 and make contacts 10 in the conventional manner with fixed contact parts (not shown). The armature 4 and the contact carrier 3 are interconnected via a relatively rigid leaf spring 11. The connection is virtually inelastic, with the result that a relative movement of the armature 4 with respect to the contact carrier 3 in the closing direction is functionally insignificant during operation. The leaf spring 11 is guided through a cutout 12 in the armature 4 and is supported
REFERENCES:
patent: 3060355 (1962-10-01), Kruzic
Barrera Raymond
Donovan Lincoln
Siemens Aktiengesellschaft
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