Patent ID: 6552644
Filing Date: 2003-04-22
Classification: H01H

Abstract:
A safety press-button switch comprisinga box-like electrically insulative housing; an actuating metal contact plate mounted inside said housing, said actuating metal contact plate having a contact; a first terminal and a second terminal mounted in said housing and respectively connected to the two opposite terminals of power supply, said first terminal being connected to said actuating metal contact plate, said second terminal having a contact facing the contact of said actuating metal contact plate; a linkage mounted inside said housing; and a press-button cap installed in a top side of said housing for pressing by hand to drive said linkage to move said actuating metal contact plate between On and OFF positions; wherein: said linkage comprises a lever, said lever having a fixed bottom end pivoted to a part inside said housing, a free top end, two stop rods bilaterally disposed near said free top end, a positioning rod disposed at one side adjacent to said stop rods, and a retaining portion disposed near said free top end and equally spaced from said stop rods and secured to the free end of said actuating metal contact plate, a switching rod, said switching rod having a bottom end pivoted to the top free end of said lever and turned with said switching rod between said stop rods; said press-button cap comprises a downwardly extended push rod and a downwardly extended hook arm respectively aimed at said switching rod of said linkage and the positioning rod of said linkage and so arranged that when pressing said press-button cap to force said actuating metal contact plate into contact with the contact of said second terminal, said push rod forces said switching rod to reverse said lever, for enabling said hook arm to hook on the positioning rod of said lever so as to hold said actuating metal contact plate in contact with the contact of said second terminal; when said actuating metal contact plate is deformed due to an overload, said lever is forced by the deformation force of said actuating metal contact plate to disengage said positioning rod from said hook arm, for enabling said actuating metal contact plate and said linkage to move away from said second terminal to switch off the safety press-button switch.