| 摘要 |
PROBLEM TO BE SOLVED: To incorporate an assisting system of a simple structure into an external operation handle device, and make the handle knob move to the TRIP display position surely during a tripping movement of a circuit breaker. SOLUTION: In an external operation handle device which becomes an assembling structure with a rotary type handle knob 4 on a mounting base 3, a turn base 5 coupled with the handle knob via a coupling shaft, and a slide base 6 linked to the turn base by being engaged with a locker handle 1e of the circuit breaker 1, in the inward of a hollow coupling shaft 9 that couples between the mounting base and the handle knob, an assisting mechanism 14 consisting of a cam body 10 fixed to the mounting base, cam follower 11 coupled with the handle knob and confronted with a cam face 10a of the cam body, and a biasing spring 12 that presses the cam follower to the cam face are installed, while during the tripping movement of the circuit breaker, the handle knob is made to acceleratedly move from ON position to the tripping display position by a rotating force acted on the cam follower in which the spring force of the biasing spring is received. COPYRIGHT: (C)2008,JPO&INPIT
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