| 摘要 |
PROBLEM TO BE SOLVED: To provide an increased durable life for a plate spring 5 and provide a stable spring load. SOLUTION: The plate spring 5 has its upper end part rounded in a cylinder shape to form an engaging part 5a and the engaging part 5a is inserted in a square hole 8 of a plunger 7 with which a magnet switch is provided. This constitution always exerts the pulling force of the plunger 7 in the central direction of the engaging part 5a rounded in a cylindrical shape when a relative position between the plunger 7 and the plate spring 5 is vertically displaced and even when the plate spring 5 is caused to bend through the movement of the plunger 7. The square hole 8 has an inner peripheral surface (an engaging surface 8a) pressing the engaging part 5a of the plate spring 5 when the plunger 7 is sucked and moved, and protrudingly arranged in a chevron shape and formed so that a central part in the direction of a lateral width is made highest. This constitution, even when the plate spring 5 is inclined relative to a joint part 9, enables the transmission of the tensile force of the plunger 7 to the approximate central part of the engaging part 5a since the utmost protruding central part of the engaging surface 8a contacts with the engaging part 5a. |
