Patent ID: 6133813
Filing Date: 2000-10-17
Classification: H01H

Abstract:
An electromagnetic relay having a contact arrangement and a magnet system, said magnet system comprising a yoke and an armature movably seated on the yoke, a leaf spring that respectively has a fastening section secured to lie planarly on a planar seating section of a respective, rigid carrier formed by one of the yoke and armature and respectively having an adjoining, unsecured spring section extending beyond a free end of the carrier, said spring section having a predetermined motion latitude extending perpendicular to the plane of the fastening section, the improvements comprising a roll-off region for the leaf spring having a wedge shape in the quiescent condition being provided between the seating section and the free end of the carrier, said roll-off region being formed by a convex curvature of a roll-off section selected from the carrier and the leaf spring away from the plane of the seating surface, the roll-off section having at least a radius of curvature that satisfies the condition ##EQU5## with r equaling the radius of curvature of the roll-off section; d equaling the thickness of the leaf spring; .sigma..sub.FB equaling the spring bending limit of the leaf spring; and E equaling the modulus of elasticity of the leaf spring, the motion latitude between the leaf spring and the carrier at the open end of the roll-off region being limited by a fixed detent according to the following relationship: ##EQU6## with s equaling the motion latitude of the leaf spring relative to the free end of the carrier; 1 equaling the length of the roll-off section; and r equaling the radius of curvature.