Patent ID: 6627830
Filing Date: 2003-09-30
Classification: G05B,H01H

Abstract:
A push-button switch designed to be switched OFF-ON-OFF by depressing a button comprising:a switch case; a push button depressibly supported by said switch case; a contact comprising a movable terminal disposed in said switch case in a manner that a first end thereof is rotatable about a second end thereof, and a normally open stationary terminal fixed to place in said switch case and arranged to be in or out of contact with said movable terminal through rotation of the first end of said movable terminal; an operative member disposed in said switch case in a manner that a first end thereof is rotatable as interlocked with depression of said push button; urging means having its opposite ends locked to the first end of said movable terminal and the first end of said operative member for urging the first end of said movable terminal while urging the first end of said operative member in a first direction; and releasing means brought into action by more than a predetermined amount of depression of said push button to release said operative member from interlocked relation with said push button, wherein when in conjunction with increase of an amount of depression of said push button, an amount of rotation of the first end of said operative member against said urging means is increased to a first dead point at which an urging force applied by said urging means to said movable terminal is changed from the first direction to a second direction, said movable terminal is brought into contact with said normally open stationary terminal thereby shifting said contact from a first OFF state to an ON state, wherein when the amount of rotation of the first end of said operative member released from the rotation against said urging means reaches a second dead point at which the urging force applied by said urging means to said movable terminal is changed from the second direction to the first direction, said movable terminal is moved away from said normally open stationary terminal thereby shifting said contact from said ON state to a second OFF state, and wherein two or more of said contacts are disposed in said switch case and are simultaneously turned ON or OFF by depressing said push button.