Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive
Patent
1998-09-02
1999-12-14
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Polarity-responsive
336 96, 335260, 335278, H01H 5122
Patent
active
060023120
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electromagnetic relay having and in which are anchored bearers for fixed contacts, as well as contact terminal pins, plane, ends, perpendicular to the basic plane, which form working air gaps with the armature, and together with the fixed contacts of the base, corresponding to the armature movement.
A relay of the type named above is specified in WO 94/22156. corresponding to U.S. Pat. No. 5,617,066 incorporated herein by reference. There a coil body is set immediately on the base, which body, in addition to the coil winding and the core, also bears the yokes and a permanent magnet, and which is connected directly with the base in side areas. A cap covering the coil body is connected with the base for the formation of a closed housing. This known construction is designed for conventional solder connection technology; however, the connection structure of base and coil body is not designed for stronger mechanical or thermal loads. However, since surface mounting technique (SMT) and connection technology with press-fit pins are also increasingly desired for the equipping of circuit boards in addition to conventional contacting via solder terminal pins, relays should be constructed so as to be able to withstand, as much as possible, the mechanical or, respectively, thermal loads that occur with these technologies, without worsening of the precisely set characteristics of the relay. In addition, from WO 94/13002 a relay of similar construction is known in which a coil block and a terminal arrangement are together extrusion-coated with insulating material, creating a one-piece basic body unit. An armature with movable contact springs is set on this basic body unit, and the relay thus formed is closed with a covering cap. Since, however, in this case the basic body unit forms the lower part of the housing with respect to the terminal plane, and the armature is located in the upper region, the contact terminals must be guided downward laterally next to the coil. The terminals thereby not only become very long, but also require additional space, which, together with the required intermediate insulating walls, increases the width of the relay. Moreover, the solder terminal lugs located there cannot be replaced with other terminals, e.g. press-fit posts, without a modification of the construction.
SUMMARY OF THE INVENTION
An object of the present invention is to construct a relay design of the type named above with such a construction that the insulation strength between the magnetic circuit and the winding is improved in the simplest way possible, and at the same time the mechanical stability of the relay is increased with the smallest possible volume; different terminal technologies, in particular also SMT terminals and press-fit posts, should thereby also be usable without modification of the remaining construction.
According to the invention, this object is achieved in the named relay construction in that a basic body is designed by means of sheathing of the coil on all sides with insulating material, which together with the base forms a cuboidal housing, whereby the coil together with the core is embedded in the upper region of the basic body, and is insulated downward by means of a separating wall, and whereby the basic body downwardly comprises side walls integrally formed all around, which surround the base in box-type fashion and form a closed switching chamber therewith. By means of the basic body produced according to the invention by means of embedding, preferably by extrusion coating of the coil with insulating material there results a high rigidity and stability of the relay construction. The adjustments set in the manufacturing are in this way securely maintained, even if mechanical or thermal loads act from outside on the relay housing formed by the basic body and base.
This stable construction is particularly advantageous if the basic body comprises on both sides of the armature a shoulder under which are located the contact terminal pins, r
REFERENCES:
patent: 4185163 (1980-01-01), Schedele
patent: 4307362 (1981-12-01), Kobler et al.
patent: 4717901 (1988-01-01), Autenrieth et al.
patent: 4985984 (1991-01-01), Umezaki
patent: 5167066 (1992-12-01), Dittman et al.
patent: 5440285 (1995-08-01), Nakanishi et al.
patent: 5617066 (1997-04-01), Dittmann et al.
Dittmann Michael
Heinrich Jens
Stadler Heinz
Donovan Lincoln
Nguyen Tuyen T.
Siemens Aktiengesellschaft
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