Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive
Patent
1999-11-04
2000-11-07
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Polarity-responsive
80128, H01H 5122
Patent
active
061442704
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electromagnetic relay having longitudinal limb extending axially through the coil former, of the coil, and a transverse web, a first end section of the armature being mounted in the region of a first coil flange on an end section of the core, and its second end section forming an operating air gap with the core in the region of the second coil flange, and and at least one moving contact spring, the contact spring being operated by the armature via an operating device which can be moved transversely with respect to the coil axis.
Such a relay has been disclosed, for example, in DE 34 43 094 A1. There, the T-shaped core is expanded into an E-shape or M-shape by projections of the ends of the transverse limbs, which extend parallel to the center limb. The U-shaped armature is mounted at the ends of its longitudinal arms on these projections of the core, so that its transverse web forms the operating air gap with the free end of the center limb of the core. This type of armature mounting on an E-shaped core always involves additional bearing elements in the form of a bearing spring, which not only involves corresponding complexity during production with stamping and bending, but also during assembly with corresponding adjustment and riveting or welding processes. However, such an armature cannot be secured in its mounting in any other way. In addition, there is only a relatively small pole area in the operating air gap between the armature transverse limb the core end, and this pole area cannot readily be enlarged, either.
SUMMARY OF THE INVENTION
The aim of the present invention is to design a relay of the type mentioned initially such that it can be assembled in a particularly simple manner using only a small number of parts which are of simple design and are easy to produce, in which case it is nevertheless possible to achieve reliable operation and a high pull-in reliability by virtue of a relatively large pole area in the operating air gap.
The same is achieved according to the invention in that the armature is mounted via its transverse web on the free end section of the longitudinal limb of the core, and in that the free ends of the armature longitudinal arms form two parallel operating air gaps with the free ends of the core transverse limbs.
Thus, in comparison to the known relay, the armature mounting and the operating air gap are arranged interchanged in the relay according to the invention, so that the U-shaped end of the armature encloses the first coil flange and is thus secured just by virtue of its arrangement in the longitudinal direction of the coil axis. Since the armature can also be secured in other directions in the region of a coil flange by simple structural design, there is no need for any bearing spring, with its corresponding production and assembly effort. On the other hand, the two parallel operating air gaps at the free ends of the armature permit a relatively large pole area. This pole area can additionally be enlarged by the core transverse limbs each being provided at their ends with projections in the direction of the armature longitudinal arms, so that the T-shape of the core is expanded, as indicated, into an M-shape or an E-shape.
In order to secure the armature in its mounting, the first coil flange in a preferred embodiment has an attachment, and this attachment and the armature have projections and/or recesses which engage in one another. The armature can then be further secured in its mounting by a housing cap that is plugged on.
The contact spring that is operated by the armature is preferably arranged approximately parallel to the coil axis on the side of the coil opposite the armature, and the armature movement is transmitted to the contact spring by a slide which is guided between the transverse limbs of the core on the one side and the adjacent coil flange on the other side, such that it moves at right angles to the coil axis. An attachment on the said housing cap can also provide additional guidance for t
REFERENCES:
patent: 3505629 (1970-04-01), Krautwald et al.
patent: 3553729 (1971-01-01), Mori et al.
patent: 3701066 (1972-10-01), Bosch et al.
patent: 4008447 (1977-02-01), Anderson et al.
patent: 4290037 (1981-09-01), Inagawa et al.
Mader Leopold
Mikl Rudolf
Barrera Raymond
Donovan Lincoln
EH-Schrack Components Aktiengesellschaft
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