Patent ID: 6605792
Filing Date: 2003-08-12
Classification: H01H

Abstract:
A switch, comprising:a body; an operating shaft housed in the body; a moving contact arranged in the body such that the moving contact is moved in an axial direction of the operating shaft; a pair of fixed terminals arranged in the body such that the pair of fixed terminals are positioned over the moving contact, a first fixed terminal of the pair of fixed terminals having a first fixed contact and a second fixed terminal of the pair having a second fixed contact; and a first coil spring housed on the side of a bottom wall of the body so that the first coil spring presses the moving contact upward in the axial direction of the operating shaft, wherein the moving contact has first and second contacts provided at both ends, the first contact is made of noble metal, a pair of fixed terminals are respectively provided with a fixed contact, a hole is formed in a center of the moving contact, a second coil spring pierces the hole of the moving contact, the second coil spring is arranged coaxially with the first coil spring inside the first coil spring, the second coil spring presses the operating shaft upward in the axial direction of the operating shaft, the first and second contacts are touched to each fixed contact by pressure of the first coil spring on the moving contact, when the operating shaft moves downward in the axial direction, an end of the operating shaft touches to the moving contact, and further when the operating shaft is pushed down against pressure of the first coil spring, the first contact of the moving contact is separated from the first fixed contact earlier than the second contact is separated from the second fixed contact, and when the operating shaft returns, the first contact of the moving contact is touched to the first fixed contact of the fixed terminal later than the second contact is touched to the second fixed contact by the pressure of the first coil spring.