초록 ▼

A magnetic switch wherein a core flange 22a is so formed as to always confront the outer peripheral surface of a cylindrical plunger 23 while the plunger is being shifted in a direction from the flange to another core member 4a by the magnetic attraction force, thereby to prevent the magnetic attrac

A magnetic switch wherein a core flange 22a is so formed as to always confront the outer peripheral surface of a cylindrical plunger 23 while the plunger is being shifted in a direction from the flange to another core member 4a by the magnetic attraction force, thereby to prevent the magnetic attraction force from generating in a direction reverse to that the plunger is to be shifted.

대표청구항 ▼

A magnetic switch, comprising: first and second annular core members (22,4a) disposed opposite to each other; a hollow exciting coil (6) disposed between said first and second core members; a plunger (23) slidably disposed within said exciting coil and shiftable in a direction from said first core m

A magnetic switch, comprising: first and second annular core members (22,4a) disposed opposite to each other; a hollow exciting coil (6) disposed between said first and second core members; a plunger (23) slidably disposed within said exciting coil and shiftable in a direction from said first core member to said second core member by magnetic attraction force; and electrical contacts (11,12) opened and closed by the shift of said plunger, wherein said first core member has a radially extending inner portion (22a) and a radially extending outer portion (22b) located in different axial positions, respectively, said inner portion and outer portion lying in planes parallel to each other, said inner portion being disposed closer to said second core member than said outer portion, said inner portion being located to confront an end surface (23a) of said plunger when fully shifted by the magnetic attraction force, said outer portion being located on approximately the same plane as the end surface of said plunger when in an unshifted, rest position and radially spaced apart from the end surface of said plunger, and an intermediate portion (22c) spaced from a peripheral surface of said plunger connecting said inner portion and outer portion in the axial direction of said plunger.