Handle operating mechanism in circuit breaker

Abstract

In a slow-make type circuit breaker for opening and closing a main circuit contact in synchronism with the manual operation of a rotary operation handle, a ratchet unit 12 as an artificial quick-make means for forcibly increasing the operating force of the operation handle in the middle of a stroke for ON operation of the contact is constituted by a convex cam 11 made of metal and coupled with the operation handle 5, a ratchet 12b made of metal and disposed at a point close to an ON position of the operation handle so as to face the cam, a driving spring 12c for pressing the ratchet toward a rotary movement path of the cam, and a ratchet case 12a in which these parts are incorporated. The unit is fabricated inside a cover 1b of a circuit breaker body. Here, the cam and the ratchet are formed as common parts, and the driving spring is selected in accordance with the kind of circuit breaker.

Dependencies are inferred from the claim text.