Patent ID: 9230758
Filing Date: 2016-01-05
CPC Classification: H01H,Y10T

Claim Text:
1. A mechanical assembly for a wire-fuse circuit-breaker, the assembly being removably and pivotally mounted between two parts of a support of the circuit-breaker including an upper part and a lower part, the assembly comprising: a fuseholder tube for accommodating a fuse wire with the fuseholder tube having an upper end that includes a dome for enabling one end of the fuse wire to be inserted and held therein and an open lower end through which-exhaust gas produced by breaking the fuse wire passes; a fuse-breaker including: a trunnion on which the fuseholder tube is pivotally mounted between an open position and a closed position, said trunnion including pins removably mounted on the lower part of the support to enable pivoting of the mechanical assembly relative thereto, and means for fixing an other end of the fuse wire; a drive lever pivotally mounted on the trunnion and actuated by an operator; and a breaking lever that mechanically breaks open the fuse wire with the breaking lever being pivotally mounted relative to the trunnion; wherein: the levers and the fuseholder tube are mounted on the trunnion to leave open an area in the vicinity of the open lower end of the tube to allow gases produced by breaking the fuse wire to exhaust without disturbing the flow thereof; and with the fuse breaker further comprising; a drive shaft mounted in the pins of the trunnion and fastened to the drive lever to form a common drive shaft between the trunnion and drive lever for actuating the breaking lever to break open the fuse wire; and a cam mounted on the drive shaft in a tight fit such that it rotates in concert with the pivoting movement of the drive lever and bears against the breaking lever such that upon actuating the drive lever the drive lever and the drive shaft pivots in a direction opposite to the direction of pivoting of the fuseholder tube with the cam rotating to cause the breaking lever to pivot in a direction opposite to the direction of pivoting of the drive lever.