Patent ID: 6559394
Filing Date: 2003-05-06
Classification: H02B

Abstract:
In an air circuit breaker comprising;a movable breaker body having a power source terminal and a load terminal and connecting or disconnecting a circuit between an electrical power source and an electrical load, a cradle electrically and mechanically connected to or separated from the breaker body in accordance with movement of the breaker body and having connectors for electrically and mechanically connecting to the breaker body, a screw pipe for guiding the connecting to or separating from the breaker body and a power source terminal and a load terminal respectively connected to the electrical power source and the electrical load, a base frame fixed to the breaker body, a lead screw supported by the base frame so as to be rotatable and movable to a position for being inserted into the screw pipe and a position for being separated from the screw pipe, a lead bar assembly having a lead bar supported by the base frame so as to perform a horizontal linear movement, extended so as to be parallel with the lead screw and linearly moving a distance corresponded to the translocation of the lead screw in a direction opposite to a moving direction of the lead screw when the lead bar is pushed in or drew out from the lead screw pipe and a spring for applying an elastic force to the lead bar in the insertion direction of the lead screw, a cam connected to the lead bar and for converting the linear movement of the lead bar into a rotation movement and a position indicating apparatus connected to the cam and for indicating a position of the breaker body according to the translocation of the lead screw, the position indicating apparatus comprising; a first power converting means connected to the cam and for converting the rotation of the cam into a vertical linear motion; a second power converting means connected to the first power converting means and for converting the linear motion of the first power converting means into a rotation motion; and an indicating means for indicating a position of the breaker body according to the rotation motion of the second power converting means.