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US 10,476,242 B2Granted
Motor control center unit with retractable stab assembly and methods for using the same
AssigneeSiemens Industry, Inc.
InventorAjit Pharne
Life of this patent
Estimating the term…
Abstract
Embodiments of a motor control unit for a motor control center and methods for servicing the same are provided. The motor control unit comprises a housing for enclosing one or more electrical components therein. The housing includes a retractable stab assembly and a lead screw assembly operably coupled thereto for extending and retracting one or more stabs for controlling the flow of power to the one or more electrical components.
Claims16
A motor control unit for a motor control center comprising:
- a housing comprising:
- a first panel comprising:
- a switch assembly comprising a switch for controlling power flow to one or more components enclosed in the housing, and an access opening;
- an second panel comprising:
- a bracket operably coupled to the switch assembly and including:
- a restrictor piece adapted to restrict movement of the motor control unit from the motor control center when the switch is in a first position, and an access shield adapted to limit access to one or more internal components enclosed in the housing when the switch is in the first position;
- a third panel operably coupled to a stab assembly, the stab assembly comprising:
- a stab housing comprising one or more slots adapted to selectively attach one or more stabs thereto, a lead screw bracket comprising:
- a mounting plate operably coupled to the stab housing;
- a first bracket comprising:
- a first portion comprising a lead screw opening, and a second portion coupled to the mounting plate;
- a pair of guide rail brackets, each comprising:
- one or more guide rails extending rearwardly therefrom and at least partially disposed between one or more openings in the mounting plate for slideably engaging the mounting plate along the one or more guide rails;
- and a lead screw assembly comprising:
- a lead screw at least partially disposed between the lead screw opening, a first stopper operably engaged to the lead screw and coupled to the first portion for operably shifting the first stopper along an axis of the lead screw when the lead screw is moved from a first position to a second position, and a second stopper coupled to an end of the lead screw for limiting axially movement of the stab assembly.
12 more elements
A motor control center comprising:
- a control center section comprising a compartment adapted for at least partially receiving a motor control unit, wherein the motor control unit comprising:
- a housing comprising:
- a first panel comprising:
- a switch assembly comprising a switch for controlling power flow to one or more components enclosed in the housing, and an access opening;
- an second panel comprising:
- a bracket operably coupled to the switch assembly and including:
- a restrictor piece adapted to restrict movement of the motor control unit from the motor control center when the switch is in a first position, and an access shield adapted to limit access to one or more internal components enclosed in the housing when the switch is in the first position;
- a third panel operably coupled to a stab assembly, the stab assembly comprising:
- a stab housing comprising one or more slots adapted to selectively attach one or more stabs thereto, a lead screw bracket comprising:
- a mounting plate operably coupled to the stab housing;
- a first bracket comprising:
- a first portion comprising a lead screw opening, and a second portion coupled to the mounting plate;
- a pair of guide rail brackets, each comprising:
- one or more guide rails extending rearwardly therefrom and at least partially disposed between one or more openings in the mounting plate for slideably engaging the mounting plate along the one or more guide rails;
- and a lead screw assembly comprising:
- a lead screw at least partially disposed between the lead screw opening, a first stopper operably engaged to the lead screw and coupled to the first portion for operably shifting the first stopper along an axis of the lead screw when the lead screw is moved from a first position to a second position, and a second stopper coupled to an end of the lead screw for limiting axially movement of the stab assembly.
13 more elements
A retractable stab assembly for a motor control center comprising:
- a stab housing having one or more slots adapted to selectively attach one or more stabs thereto;
- a lead screw bracket comprising:
- a mounting plate having one or more contact points coupled to one or more contact points of the stab housing;
- a first bracket comprising a first portion having a lead screw opening adapted to at least partially receive a lead screw therebetween, and a second portion coupled to the mounting plate;
- a pair of guide rail brackets, wherein each guide rail bracket comprises one or more contact points for selectively mounting at least a portion of each guide rail bracket to a third panel of a motor control unit, and one or more guide rails extending rearwardly from a portion of the guide rail bracket and at least partially disposed between one or more openings in the mounting plate for slideably engaging the mounting plate along an axis of the guide rail;
- and
- a lead screw assembly comprising a lead screw having at least a portion thereof threaded and extending at least partially through the lead screw opening, a first nut threadingly engaged to the lead screw and coupled to the first portion for operably shifting the first nut along an axis of the lead screw when the lead screw is moved from a first position to a second position, and a first stopper threadingly engaged at an end of the lead screw and adapted to limit axially movement of the lead screw beyond one side of the first stopper.
4 more elements
Dependencies are inferred from the claim text.