Electromagnetic relay

Details Electromagnetic relay Electromagnetic relay

1988-07-08

1990-08-21

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Multiple contact type

335 83, H01H 6702

Patent

active

049510177

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to an electromagnetic relay with a folding armature.
In such a relay (U.S. Pat. No. 4,260,973, the folding armature of the relay is held by a leaf spring at its support in engagements with the magnet yoke, wherein the leaf spring extend around the support in a form of a curl so as to be close to the support. The leaf spring is prestressed in such a way that it lifts the folding armature from the coil core when the relay winding is switched off and presses the switching contact fastened at the folding armature against a non-operating contact of the relay with a required contact pressure. In so doing, the folding armature is flipped with its support end around a support edge at the magnet yoke.
A disadvantage in this solution is that the contact of the folding armature at the support is only achieved when the center of rotation of the curl coincides with the support edge of the magnet yoke. However, as a result of the tolerances in the leaf spring curl area and the participating components, such as the armature plate and the magnet yoke, the ideal case of a force-free hinge-like contact is achieved, as well as a contact accompanied by pressing and friction, or no contact, i.e. a spacing between the armature plate and the armature bearing, in some cases accompanied by a distinct air gap. But both these cases are undesirable. The contact accompanied by pressing forces leads to a bearing friction, interference in the course of movement or possibly jamming. In the case of an air gap between the armature plate and the support edge, magnetic force is lost because of the increase in the magnetic resistance. This loss is expressed in increased response voltage values. Moreover, shaking and jarring shocks act in their entirety on the leaf spring curl which can be permanently deformed, which can impair the operational reliability of the relay and can lead to outage.


SUMMARY OF THE INVENTION

The object of the present invention is an electromagnetic relay in which a folding armature is pressed to a support at the magnet yoke by a leaf spring with sufficient force to ensure a frictionless and secured against jarring shocks support.
The object of the invention is achieved by providing a relay in which the leaf spring is prestressed in the curl area between fastening points at the folding armature and the magnet yoke in an assembled state, to insure a contact between the folding armature and the magnet yoke at the folding armature support.
The relay according to the invention has the advantage that the force components of the leaf spring, which force components act at the supports in the direction of the fastening points of the leaf spring at the folding armature and at the magnet yoke, prevent a bearing friction caused by axial displacement of the folding armature, on one hand, and a lifting of the folding armature from the magnet yoke during jarring shocks and shaking, on the other hand; the leaf spring is bent around the support in a hairpin shape. Another advantage is to be seen in that, during the production of the leaf spring and during the installation of the folding armature in the relay, the force components are dimensioned in such a way that adjustment tolerances have no influence on the operational reliability of the support.
It is particularly advantageous to bend the leaf spring in the area of the support as a hairpin curl with the arms spread apart at an acute angle with one arm being fastened at its end to the magnet yoke and the other arm, which is fastened to the folding armature, capable of pivoting the folding armature into a non-operating position with a desired restoring force. A lateral tilting or canting of the folding armature is reliably prevented by the arms of the leaf spring being fastened, respectively, to the folding armature and the magnet yoke at two riveting points located adjacent to one another. Preferably, sides, the arms of the leaf spring have two holes into which rivet pins of the folding armature and the magnet yoke project. Relie

REFERENCES:
patent: 3437962 (1969-04-01), Bell
patent: 4460881 (1984-07-01), Meister et al.

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