Patent ID: 7238906

Claim:
An electric switch ( 10 ) of the normally closed type comprising: a casing ( 12 ) which carries a pair of fixed contact elements ( 42 ) each of which comprises a contact head ( 48 ) which delimits a front transverse fixed contact surface ( 58 ) and which is arranged inside ( 34 ) the casing ( 12 ) in such a way that the two fixed contact surfaces ( 58 ) are longitudinally aligned; a contact bar ( 96 ), forming a movable contact, which runs transversely opposite the two fixed contact surfaces ( 58 ) and which is mounted movably, according to a horizontal longitudinal direction, between; at least one rear closure position in which a rear contact surface ( 100 ) of the contact bar ( 96 ) is in contact bearing on the said fixed contact surfaces ( 58 ) so as to establish an electrical link between the two fixed contact elements ( 42 ) of the switch ( 10 ); and a front opening position in which the said rear contact surface ( 100 ) is offset longitudinally towards the front in such a way as to interrupt the said electrical link; and a member ( 60 ) for actuation of the movable contact bar ( 96 ) which is mounted so as to slide longitudinally in the casing ( 12 ) between; at least one rear rest position in which it is in abutment against a portion ( 70 ) of the casing ( 12 ) and in which the movable contact bar ( 96 ) is in its rear closure position; and a front triggering position in which the movable contact bar ( 96 ) is in its front opening position; the moveable contact bar ( 96 ) and the actuation member ( 60 ) constituting a movable assembly, and the switch ( 10 ) comprising a return spring ( 108 ) which co-operates with the movable contact bar ( 96 ) so as to urge it towards its rear closure position; characterized in that the movable contact bar ( 96 ) is mounted rocking on the actuation member ( 60 , 66 , 92 ) about an upper transverse axis (A), in that the actuation member ( 60 , 72 ) comprises a front face ( 74 ) for driving the movable contact bar ( 96 ) towards which the bar is returned by the spring ( 108 ), and in that the said front drive face ( 74 ) is offset longitudinally towards the rear with respect to the contact bar ( 96 ) when the bar is in its rear closure position and when the actuation member ( 60 ) is in its rear rest position.