Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – With protective means for switch or contacts
Patent
1998-09-04
2000-07-25
Gellner, Michael L.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
With protective means for switch or contacts
335127, 335129, 335131, 335132, 335189, 335203, H01H 716
Patent
active
060941170
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electromagnetic switchgear with restricted guidance in which the make contacts do not touch while the break contact is fixed.
RELATED TECHNOLOGY
This kind of electromagnetic switchgear, disclosed in German Patent Application No. 35 40 460 A1, contains a magnet system, which contains an armature; a movable contact carrier, which with fixed contacts hold movable contact parts forming break and make contacts and which assumes a rest position effected by spring force; and an additional elastic connection between the armature and the contact carrier in the form of a spring supported against the armature by a clip, by which it becomes possible with a welded break contact to move the armature without activating the make contacts (restricted guidance). An electromagnetic switchgear according to European Patent No. 358 050 B1 is further developed in such a way that, with a welded break contact, the magnet system yoke, which is elastically supported against the switchgear casing, can approach until the magnet system is closed. The disadvantage of the current state of technology is that additional elastic parts are needed to achieve the restricted guidance. It is not clear from the current state of technology how restricted guidance should be realized for electromagnetic switchgears in which the armature and contact carrier are arranged in parallel planes and whose movement directions thus run not behind one another but parallel or antiparallel, as is often the case with small contactors. (See for example German Patent No. 31 46 780 C2.
SUMMARY OF THE INVENTION
An object of the present invention is to achieve the restricted guidance without additional component parts and for the case of parallel arrangement of the armature and contact carrier.
The present invention provides that the movements of armature and contact carrier take place in parallel with a gap and provides an elastically flexible transmission lever which establishes the operative connection between the armature and contact carrier. In this way, without additional component parts, it is achieved that, when break contacts are fixed as a result of welding or mechanical barring, movement of the armature is permitted without activating a make contact.
In an advantageous further development, the support of the transmission lever against the switchgear casing favorably affects the transmission ratio of the forces to be transmitted. This is especially so when the transmission lever is coupled at one free end with the armature, is supported with the other free end against the casing part that holds the contact carrier, and is coupled with the contact carrier between both ends.
In another advantageous further development of the present invention, the use of a transmission lever with a maximum transmission force, particularly through spring elasticity, provides a secure closing of the magnet system, although the contact carrier cannot be moved as a result of a fixed break contact. Such spring-like flexible transmission elements are known per se as snap elements in other contexts, for example according to German Patent Application No. 39 27 219 A1.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be explained in greater detail below using an exemplary embodiment from which further details and advantages can be seen. In the corresponding drawing,
FIG. 1 shows an electromagnetic switchgear according to the present invention schematically depicted in the off position;
FIG. 2 shows the same in the on position
FIG. 3 shows the same in the blocked on position.
DETAILED DESCRIPTION
In FIG. 1 and FIG. 2, electromagnetic switchgear 2 is surrounded by a switchgear casing 4. Within switchgear casing 4 a magnet system is arranged as a contact drive, which includes a fixed magnet part 6 and a movable armature 8. The linear movement of armature 8 toward fixed magnet part 6, caused when the magnet system is activated, is transmitted by a transmission lever 10 to a contact bridge 12 which is movabl
REFERENCES:
patent: 4443675 (1984-04-01), Drexler et al.
patent: 4625194 (1986-11-01), Held
patent: 4737749 (1988-04-01), Held
patent: 4988964 (1991-01-01), Streich et al.
patent: 5075660 (1991-12-01), Ootsuka
Barrera Raymond
Gellner Michael L.
Kloeckner-Moeller GmbH.
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