Patent ID: 6903290

Claim:
A safety switch for motor circuits of manufacturing machines and electric motors, comprising a casing ( 1 ) an activation key housed within the casing ( 2 ), a pair of respective first and second contact-holding elements ( 10 , 11 ), and a triad consisting of a central ( 6 ), a first ( 7 ) and a second ( 9 ) electric terminals emerging from said casing, said contact-holding elements ( 10 , 11 ) being oscillated about an oscillation axis (O—O) between two positions, a passive position and an active position respectively, each contact-holding element ( 10 , 11 ) being disposed in a tilting manner around an end of a corresponding, respectively first and second, laminar support ( 6 a , 8 a ), each of said positions being imposed by a corresponding position of said activation key ( 2 ) rotating around a rotation axis (R—R) parallel to said oscillation axis (O—O), the central terminal ( 6 ) of said triad being in permanent electric contact with one ( 10 ) of said contact-holding elements ( 10 , 11 ), said first ( 7 ) and second ( 9 ) terminals being each alternately separated or in electric contact with the corresponding first and second contact-holding element ( 10 , 11 ) depending on the position of said key ( 2 ), the contact-holding element ( 10 , 11 ) being closed upon the corresponding terminal ( 7 , 9 ) in a passive position and separated therefrom in an active position and vice versa, wherein said contact-holding elements ( 10 , 11 ) are mutually electrically connected through conductive elements that are movable with respect to one another by relative displacement of mating surfaces ( 17 a , 18 a ) in mutual contact.