Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive
Patent
1998-01-27
1999-03-30
Gellner, Michael L.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Polarity-responsive
335 83, 335128, 335202, H01H 5122, H01H 6702
Patent
active
058894519
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electromagnetic relay having at least one switching system, which has: element, which are each anchored in the base body, winding axis vertically over the baseplate, mating contact element. circuit board.
A relay of the type mentioned in the introduction is disclosed in German reference DE 28 54 591 A1, for example. In that case, the contact spring is fastened as an armature restoring spring to the yoke, and the associated connection element is connected to the yoke on the opposite side. Apart from the manufacturing difficulties entailed by such fastening of the current-carrying parts on two opposite sides of the yoke, the current path from the contact spring to the printed circuit board thereby becomes comparatively long. Moreover, the two-fold contact resistance could lead to undesirable heating in the event of high switching currents.
German reference DE 42 43 852 C1 likewise shows a relay of the type mentioned in the introduction. In that case, in order to obtain a sufficient spring length at the rear side of the yoke the contact spring is first of all angled upward, is then bent downward through 180.degree. and fitted, using a connecting element in the form of a resilient clamping device, onto the associated connection element, where it is then permanently welded in a further work operation.
SUMMARY OF THE INVENTION
The aim of the present invention is to configure an electromagnetic relay of the type mentioned in the introduction in such a way that it can switch high currents with good utilization of space, can be produced cost-effectively with a small number of simple parts and can be manufactured with largely identical individual parts either as a single relay or as a double or multiple relay.
According to the invention, this aim is achieved in that the contact spring forms two spring limbs, which are connected to one another in a U-shaped manner in the region of the armature bearing and whose ends lie approximately next to one another in the vicinity of the movable armature end, in that a first spring limb is connected as restoring limb to the contact spring connection element, and in that the second spring limb is connected as contact limb to the armature and interacts at its free end with the mating contact element for the purpose of contact-making.
By way of the two spring limbs being coherent in the shape of a U, the contact spring provided according to the invention acquires a sufficient spring length with a relatively large spring width for carrying even relatively high switching currents. Since the spring lies underneath the armature directly over the baseplate and is connected there, via its restoring limb, directly to the connection element, it is also possible to keep the current path short and ensure a small contact resistance. In order to obtain a large spring cross section, it is expedient that the contact spring, with its two spring limbs, covers approximately the entire area underneath the armature, the ends of the spring limbs projecting over the movable armature end, and the contact spring connection element as well as the at least one mating contact element being and in the base body in the region in front of the movable armature end and being mutually oppositely angled in the direction of the free ends of the spring limbs. The U-shape of the contact spring can be obtained, for example, by cutting the two spring limbs out of an essentially planar spring metal-sheet and, if appropriate, providing them only with prestressing bends. In another, likewise advantageous embodiment, the two spring limbs are obtained by folding the contact springs in a U-shaped manner through 180.degree., the ends of the spring limbs being mutually oppositely cut free as far as toward approximately half of the total spring width; in this way, the relevant end sections can be pivoted toward one another without butting against one another, while the total spring width is available for carrying current in the region of the U-shaped bend.
Since the co
REFERENCES:
patent: 4745382 (1988-05-01), Dittmann
patent: 5534834 (1996-07-01), Hendel
Barrera Raymond
Gellner Michael L.
Siemens Aktiengesellschaft
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