Patent ID: 7253371

Claim:
A normally closed (on) switch with an on-off fixed structure, comprising: a seat formed with a sleeve inside which a push part is provided, in which an elastic component is provided between the sleeve and the push part, a contact pad is provided on the push part, and two electrically conductive pads respectively contacting the contact pads are provided at two sides of the seat near the sleeve; a top cover arranged on the seat, of which the center is formed with a piercing hole corresponding to the sleeve, in which at least a pillar is provided surrounding the hole nearby; a ring being movable provided in the piercing hole of the top cover, in which a flange is formed outside one end of the ring and provided with a guidance groove corresponding to the pillar and more than one recessed portion are formed inside the fringe of ring; and a button being movable provided in the ring and being joined with the push part, in which more than one raised part corresponding to more than one recessed portion of the ring are provided along the outside of one end of the button and a groove is provided at the other end of the button.