Stop lamp switch and method for attaching the same

A stop lamp switch comprising:

• a switch case body;
• an operating shaft penetrating through a guide hole of the switch case body so as to be outwardly projected, an end of the operating shaft on an outer side abutting on a brake pedal of a vehicle;
• a cylindrical actuator freely movably provided within the switch case body, for separating a movable contact from a fixed contact when the cylindrical actuator moves toward its one end along a core direction of its cylindrical body;
• an approximately U-shaped engaging spring attached to the other end of the actuator so as to move integrally with the actuator, the engaging spring being engaged with a concave-convex locking portion provided on the other end side of the operating shaft so as to connect the other end of the actuator to the operating shaft;
• and
• a spring regulating member for spreading the engaging spring so as to engage both free ends of the engaging spring with engaging step portions provided to the spring regulating member in a freely engageable/disengageable manner with a reduced engagement force to the concave-convex locking portion, so that a protruding working piece provided to the spring regulating member is slidably penetrated through a through hole of a bottom wall of the switch case body to be outwardly projected, wherein
• after the operating shaft is inserted into the actuator so as to adjust a projected length of the operating shaft from the guide hole, the protruding working piece is pushed into the switch case body to move the spring regulating member so as to disengage both the free ends from the engaging step portions, whereby the engaging spring is engaged with the concave-convex locking portion so that the operating shaft is connected to the actuator in an integrally movable manner.