GB858996A - Electromagnet device - Google Patents

Abstract

858,996. Electromagnetic relays. KUHNKE, H. June 5, 1959 [June 6, 1958], No. 19340/59. Class 38 (5). [Also in Group XXXV] An electromagnet particularly for a relay has members which roll on surfaces extending obliquely to the direction of attractive movement of the armature, so as to convert the movement into a translational movement substantially perpendicular to the attraction movement. In Figs. 1, 2 and 4 the armature 4 is urged towards an E-shaped core 1 and coil 2 by springs 18a which also urge the armature to the left. The armature is spaced from the core 1 by balls 15, 16, 17 in inclined grooves in steel parts 5 . . . 10 secured to non-magnetic rails 11 . . . 14, 19, 20. When the relay is energized the armature moves to the right on the balls, closing the gap between the core and armature and also closing contacts 22, 23. In an alternative arrangement employing a solenoid-type of coil surrounding the spaced poles of a C-shaped core, the armature extends within the coil and across the gap in the core, being pressed toward the gap by a bowed leaf-spring, Fig. 6 (not shown). In Fig. 7 the armature 40 is spaced from the core 39 by balls in grooves as described above and guided by biasing-springs 41, 42. The end of the armature 40 engages the bent end of a contact-spring 43 to actuate the spring-set 43 . . . 47. The groove-bottoms may be curved so as to change the conversion ratio as the armature moves. The grooves may be replaced by slots of varying widths so that the balls sink to a greater or lesser extent as they run or the balls may be replaced by rollers.