公开(公告)号：US5341191A

公开(公告)日：1994-08-23

申请号：US779441

申请日：1991-10-18

申请人： Ronald W. Crookston ,  Douglas C. Marks ,  Richard E. White, III ,  Andrew J. Male ,  Yun-Ko N. Chien ,  Steven Castelein ,  William E. Beatty, Jr. ,  Alfred E. Maier ,  John G. Salvati

发明人： Ronald W. Crookston ,  Douglas C. Marks ,  Richard E. White, III ,  Andrew J. Male ,  Yun-Ko N. Chien ,  Steven Castelein ,  William E. Beatty, Jr. ,  Alfred E. Maier ,  John G. Salvati

IPC分类号： H01H73/02 ,  H01H1/22 ,  H01H9/38 ,  H01H77/10 ,  H01H75/00

CPC分类号： H01H1/226 ,  H01H77/107 ,  H01H2009/305 ,  H01H9/383

摘要： A molded case circuit breaker having current limiting capabilities optimized for relatively smaller frame sizes. More specifically, one aspect of the invention relates to a two-piece carrier assembly for carrying the main and arcing contact arms which allows the main and arcing contacts to be blown open during short circuit conditions. The two-piece carrier assembly includes an inner carrier and an outer carrier pivotally connected together. The contact arms are carried by the inner carrier. When sufficient magnetic repulsion forces are exerted on the contacts due to a short circuit condition, the inner carrier pivots relative to the outer carrier to allow the contact arms to blow open. In order to control the amount of force required for blow open, a compression spring loaded cam assembly is provided. Another important aspect of the invention relates to a contact spring housing which relocates the contact springs away from the separable contacts to protect the springs from damage, for example, from heat due to contact separation. In order to improve the interruption time of the circuit breaker for relatively large overcurrents, such as a short circuit, a reverse current loop is provided which generates sufficient magnetic repulsion forces to blow open the separable contacts in a relatively short period of time. Within the restraints of the physical dimension of a relatively smaller breaker frame size, additional features have also been incorporated. More specifically, an improved rating plug assembly is provided with a one-piece plunger, relatively easier to manufacture than known designs which utilize two-piece plungers. Another aspect of the invention relates to an auxiliary cam plate for controlling the motion of the crossbar at the remote end in a four pole circuit breaker. The cam plate compensates for bending of the crossbar to improve the contact force in the remote pole. Lastly, a molded interphase barrier forms a gas barrier within the circuit breaker and maintains its position during assembly relatively better than known interphase barriers.

公开(公告)号：US5296664A

公开(公告)日：1994-03-22

申请号：US976636

申请日：1992-11-16

申请人： Ronald W. Crookston ,  Douglas C. Marks ,  David C. Turner ,  Richard E. White, III ,  Steven Castelein

发明人： Ronald W. Crookston ,  Douglas C. Marks ,  David C. Turner ,  Richard E. White, III ,  Steven Castelein

IPC分类号： H01H71/50 ,  H01H23/00

CPC分类号： H01H71/501 ,  Y10S200/42

摘要： A positive off mechanism for a circuit breaker includes a pair of positive off levers slideable in slots in the side plates and extendable into the path of the operating handle to prevent movement of the handle to the off position when the contacts are welded closed. The positive off levers are actuated by positive off links pivotally mounted to the side plates and coupled to the positive off levers by "dog bone" connections. The positive off links in turn are actuated by the toggle mechanism of the circuit breaker which collapses to open the contacts during normal circuit breaker operation, but which remains erect when the contacts are welded closed.

摘要翻译： 用于断路器的正断开机构包括一对可在侧板中的槽中滑动的正断开杆，并且可延伸到操作手柄的路径中以防止当触头被焊接封闭时手柄移动到关闭位置。 正向离合杆由枢转地安装到侧板的正断开连杆致动，并通过“狗骨”连接联接到正向离合杆。 正向断路器又由断路器的肘节机构致动，该断路器在正常的断路器操作期间塌缩以打开触点，但是当触头被焊接闭合时其保持直立。