# US 9,520,248 B2 · Portable racking device with fixed anti-torque tang for drawout power circuit breakers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,248 B2 - Document ID: US9520248B2 - Status: Granted - Kind: B2 - Application number: 13/850,446 - Filed: 2013-03-26 - Published: 2013-10-03 - Granted: 2016-12-13 - Earliest claimed: 2012-03-30 - Assignees: Martek Corporation - Applicants: MarTek Limited - Inventors: Charles M. McClung; Russell R. Safreed, III - Web page: https://patentgrep.com/patent/US9520248B2 ## CPC - H01H 3/227: {Interlocked hand- and power-operating mechanisms} - H02B 3/00: Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear - H02B 11/127: Withdrawal mechanism - H04N 7/18: Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast - H04N 7/185: {from a mobile camera, e.g. for remote control} - H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00) - H02B: BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A portable motorized device for remotely inserting or removing (racking) draw-out power circuit breakers. Many different designs of draw-out circuit breakers may be connected or disconnected from an energized bus by a human operator cranking a jack screw mechanism that is part of the breaker. The device herein described provides a portable, motorized device that can be hand-carried to the work location and affixed to the circuit breaker without the need of any modification to the breaker or its enclosure. The torque that is required to operate the breaker's racking mechanism is provided by an electrically powered gear motor. Attached to the output shaft of the gear motor is a socket that engages the circuit breaker racking screw. Anti-torque is provided by a portion of the portable racking device that engages the racking screw support frame. ## Claims ### Claim 1 A portable, motorized device for remotely racking a drawout circuit breaker, the portable, motorized device comprising: a gear motor and a gearbox operatively attached to a drive socket configured to engage a breaker racking screw; a fixed-position, anti-torque device affixed to the gear motor, the fixed-position, anti-torque device configured to engage a breaker racking screw support frame; a power supply configured to power the gear motor; a controller configured to control the gear motor; and an operator interface remotely communicatively coupled to the gearbox, wherein the operator interface comprises a video display and the operator interface is configured to control the gear motor. ### Claim 2 (depends on 1) The portable, motorized device of claim 1, wherein the gear motor is an alternating current motor. ### Claim 3 (depends on 1) The portable, motorized device of claim 1, wherein the gear motor is a brushed direct current motor. ### Claim 4 (depends on 1) The portable, motorized device of claim 1, wherein the gear motor is a brushless direct current motor. ### Claim 5 (depends on 1) The portable, motorized device of claim 1, wherein the fixed-position, anti-torque device is oriented substantially parallel to a longitudinal axis of the drive socket. ### Claim 6 (depends on 1) The portable, motorized device of claim 1, wherein the drive socket fits a breaker racking screw comprising a hexagonal shape or a square shape. ### Claim 7 (depends on 1) The portable, motorized device of claim 1, wherein the fixed-position, anti-torque device is rectangularly shaped. ### Claim 8 (depends on 1) The portable, motorized device of claim 1, wherein the fixed-position, anti-torque device is ‘L’ shaped. ### Claim 9 (depends on 1) The portable, motorized device of claim 1, wherein the fixed-position, anti-torque device is polygonal. ### Claim 10 (depends on 1) The portable, motorized device of claim 1, wherein the fixed-position, anti-torque device comprises a flat tang. ### Claim 11 (depends on 1) The portable, motorized device of claim 1, further comprising a motor current sensor in communication with a motor control circuit, the motor current sensor communicating to the motor control circuit an amount of torque applied to the breaker racking screw. ### Claim 12 (depends on 1) The portable, motorized device of claim 1, further comprising a shaft encoder that is configured to determine a distance and a direction a circuit breaker has moved as a function of a number of revolutions of the breaker racking screw. ### Claim 13 An apparatus, comprising: a gear motor and a gearbox operatively attached to a drive socket configured to a breaker racking screw; a fixed-position, anti-torque device affixed to the gear motor and oriented substantially parallel to a longitudinal axis of the drive socket, the fixed-position, anti-torque device configured to engage a breaker racking screw support frame; a power supply configured to power the gear motor; and a hand-held controller remotely communicatively coupled to the gear motor and configured to control the gear motor, wherein the hand-held controller further comprises a video display. ### Claim 14 (depends on 13) The apparatus of claim 13, further comprising: a motor current sensor in communication with the hand-held controller, the motor current sensor communicating to the hand-held controller an amount of torque applied to the breaker racking screw; and wherein the hand-held controller is further configured to render the amount of torque applied to the breaker racking screw on the video display. ### Claim 15 (depends on 13) The apparatus of claim 13, further comprising: a shaft encoder that is configured to determine a distance and a direction of a circuit breaker that has moved, as a function of a number of revolutions of the breaker racking screw, and report the distance and direction to the hand-held controller; and wherein the hand-held controller is further configured to render the distance and the direction that the circuit breaker has moved on the video display. ### Claim 16 (depends on 13) The apparatus of claim 13, wherein the fixed-position, anti-torque device is oriented substantially parallel to a longitudinal axis of the drive socket. ### Claim 17 A system, comprising: a gear motor and a gearbox operatively attached to a drive socket configured to engage a breaker racking screw; a fixed-position, anti-torque device affixed to the gear motor, the fixed-position, anti-torque device configured to engage a breaker racking screw support frame; and a hand-held remote controller remotely communicatively coupled to the gearbox and configured to control the gear motor, wherein the hand-held remote controller comprises a video display. ### Claim 18 (depends on 17) The system of claim 17, further comprising a motor current sensor in communication with the hand-held remote controller, the motor current sensor communicating to the hand-held remote controller an amount of torque applied to the breaker racking screw; and wherein the hand-held remote controller is further configured to render the amount of torque applied to the breaker racking screw on the video display. ### Claim 19 (depends on 17) The system of claim 17, further comprising: a shaft encoder that is configured to determine a distance and a direction of a circuit breaker has moved, as a function of a number of revolutions of the breaker racking screw, and report the distance and direction to the hand-held remote controller; and wherein the hand-held remote controller is further configured to render the distance and the direction that the circuit breaker has moved on the video display. ### Claim 20 (depends on 17) The system of claim 17, wherein the fixed-position, anti-torque device is oriented substantially parallel to a longitudinal axis of the drive socket.