Contactor for vehicle brake lights, comprises mobile key and metallic plate which are mounted on the plunger piston and move with it to break a normally closed contact with a contact spring

摘要

Normally a mobile key (3) which is in contact with a metal plate (6) compresses a contact spring (5) which is mounted on a support or stopwasher (1) of the pneumatic braking servomotor thus forming a normally closed electrical circuit. On vehicle braking the mobile key and metal plate which are mounted on the piston (4) move with it to break the contact between the metal plate and contact spring and operate the brake lights