| 摘要 |
A contact closure mechanism for a circuit breaker has a pair of contact arms bearing contacts which are pivotally mounted at their mid-sections on the ends of outwardly extending projections formed on a member slidable along an axis. A coiled contact pressure spring urges the contact arms into closure relationship with respective stationary contacts to establish electrical contact. A coiled contact opening spring coaxially disposed with respect to the pressure spring, selectively urges the slide member in one direction along the axis when the latching load pressure is relieved, causing the contact arms to pivot and their contacts to separate from the fixed contacts a distance which is exponential with respect to movement of said slide member. As the slide member moves, rocker cams forming an integral part of the opposing inside housing walls, are engaged by the contact arms which causes a rolling, pivotal separating movement to occur between the respective contact pairs of the circuit breaker. |
