Abstract: Drawout apparatus includes a carriage mounting a circuit breaker and supported on telescoping rails to facilitate racking movement of the circuit breaker between extreme positions of electrical engagement and disengagement with respect to switchboard primary terminals. Racking movement into the engaged position is mechanically assisted by a racking screw. While in the engaged position, a separate clamping screw of a joint clamping mechanism is operated to exert equal and oppositely directed forces on interleaved contact fingers of plural associated breaker-switchboard terminal connectors.

Abstract: Drawout apparatus includes a carriage mounting a circuit breaker and supported on telescoping rails to facilitate racking movement of the circuit breaker between extreme positions of electrical engagement and disengagement with respect to switchboard primary terminals. Racking movement into the engaged position from an intermediate test position is mechanically assisted by a racking mechanism. While in the engaged position, a joint clamping mechanism is operated to perfect plural breaker-switchboard terminal joints. A trip interlock insures that the circuit breaker can only be closed while in the test position and in the engaged position with terminal joints clamped. Display apparatus indicates the various circuit breaker positions and the clamped condition of the terminal joints.

Abstract: Electrical joint apparatus includes an array of stab connectors each having plural contact fingers and an array of receiver connectors each having contact fingers arranged in lapped relation with the contact fingers of an associated stab connector. A clamping rod extends freely through apertures in the stab fingers and carries springs at each end of the stab connector array. A first cam follower, affixed to one end of the rod, and a second cam follower movably supported on the rod, are driven in opposite directions by a cam, such as to uniformly load the springs and thereby develop equal and oppositely directed forced clamping the lapped fingers in electrical interconnection.

Abstract: A drawout mechanism includes a carriage mounting a circuit breaker and supported on telescoping rails to facilitate racking movement of the circuit breaker between extreme positions of electrical engagement and disengagement with respect to switchboard primary disconnect contacts. In an intermediate test position, the primary contacts are disengaged but plural secondary contacts mounted by the carriage and by the switchboard are engaged for testing of accessorial functions. The plural switchboard secondary contacts are floatingly mounted such that they can be drawn en masse into contact engaging alignment with the plural circuit breaker secondary contacts as the carriage moves into the test position from the disengaged position.

Abstract: A drawout mechanism includes a carriage mounting a circuit breaker and supported on telescoping rails to facilitate racking movement of the circuit breaker between extreme positions of electrical engagement and disengagement with respect to switchboard primary disconnect contacts. In an intermediate test position, the primary contacts are disengaged but secondary contacts of the circuit breaker and switchboard remain engaged for testing of accessorial functions. An indicator identifies these engaged, test and disengaged positions. Racking movement between the test and engaged positions is powered via a racking mechanism. A trip interlock controlled by the racking mechanism operates to enable closure of the circuit breaker only when the carriage is in the test and engaged positions and to trip the circuit breaker incident with initial movement of the carriage away from these two positions, as well as to disable closure of the circuit breaker while the carriage is anywhere therebetween.

Abstract: A drawout mechanism includes a carriage mounting a circuit breaker and supported on telescoping rails to facilitate racking movement of the circuit breaker between extreme positions of electrical engagement and disengagement with respect to switchboard primary disconnect contacts. In an intermediate test position, the primary contacts are disengaged but secondary contacts of the circuit breaker and switchboard remain engaged for testing of accessorial functions. Indicator apparatus includes an elongated step cam carried by an arm pivotally mounted to the carriage. The step cam is engaged by a stationary actuator to differentially angularly orient the arm during racking movement of the circuit breaker, thus appropriately positioning a flag, also carried by the arm, to identify the various breaker positions.

Abstract: A drawout mechanism includes a carriage mounting a circuit breaker and supported on telescoping rails to facilitate racking movement of the circuit breaker between extreme positions of electrical engagement and disengagement with respect to switchboard primary discount contacts. In an intermediate test position, the primary contacts are disengaged by secondary contacts of the circuit breaker and switchboard remain engaged for testing of accessorial functions. An indicator identifies these engaged test and disengaged positions. Rocking movement is powered via a racking screen and cam combination to provide enhanced mechanical advantage. The carriage is locked on the rails during racking movement, and manually operable gates selectively control movement of the carriage between the test and disengaged positions. Provisions are made to padlock the carriage in the test and disengaged positions, and latches control the rail conditions while the carriage is dismounted.