Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1997-11-06
1999-05-11
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335 83, 335 80, H01H67/02
Patent
active
059032014
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an electromagnetic relay. A relay described in European reference EP 0 281 950 B1. This structure makes it possible to configure different contact complements with a fundamental structure that remains the same, the connection configuration of the blade terminals on the underside of the base being distributed in a manner corresponding to the standards for motor vehicle relays. The insulation between the load connections and with respect to the coil is problematic here for use with the purpose of switching very high currents. A similar relay is described in European reference EP 0 195 956 B1. The spring arms of that document's contact spring are connected by means of a multiple-stranded copper wire; the possibility of a double changeover is also mentioned there, in each case two contact pieces situated coaxially opposite one another being arranged on each spring arm and being connected to one another in each case through a hole in the contact spring. However, such a structure with two large contact rivets for the switching of very high currents and with the intervening material of the contact springs, on the one hand, and of the multiple-stranded copper wire, on the other hand, would lead to a very large thickness in the axial direction of the contact pieces, which would be very difficult to control during production of the contact spring. In addition, the total height of the contact pieces would also be subject to large tolerances, which would lead to complicated measures for adjusting the contact separations.
SUMMARY OF THE INVENTION
The aim of the present invention is to configure a relay of the type mentioned in the introduction in such a way that, in spite of simple production and with a narrow and compact structure, it is suitable for switching very large switching powers on and off and/or over, it also being possible to realise the requisite insulation of the load connections in a simple manner.
This aim is achieved according to the invention in that all of the load connection elements are anchored with their main plane in a common plane, which is perpendicular to the basic plane, on that side of the coil which is opposite to the second yoke limb, and extend in this common plane to the underside of the base.
The construction according to the invention makes it possible to achieve a very narrow and compact structure, it being possible to improve the insulation of the load connection elements with respect to the coil by means of an insulating wall standing perpendicularly on the bottom side of the base. In this case, the load connection elements can either be embedded in the material of the base or be guided in mutually isolated pockets of the base of the insulating wall to the bottom side of the relay, where they preferably terminate in mutually insulated chambers.
In an advantageous refinement, the relay according to the invention is designed as a bridge contact relay, the contact spring, which is fastened to the armature, being split in a forked manner into two spring arms at its free end section projecting over the moveable end of the armature, it being possible for each of the spring arms to be respectively switched over between two stationary mating contact elements and the two spring arms being connected together by means of a conductor strip made of highly conductive metal; in this case, each of the two spring arms carries, on its moveable end section, two contact pieces on opposite surfaces, which contact pieces are offset with respect to one another in the transverse direction of the contact spring, and those contact pieces of the two spring arms which are aligned with one another on the same surface side respectively interact with a mating contact pair as bridge make contact and as bridge break contact, respectively.
As a result of this offset arrangement of the make-contact contact pieces with respect to the break-contact contact pieces on the common changeover spring, the production process is facilitated, the total contact height on
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Donovan Lincoln
Siemens Aktiengesellschaft
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