Patents by Inventor Robert T. Elms

Robert T. Elms has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9030795
    Abstract: A method provides electronic overload protection having a thermal trip level. The method executes a function by a processor; provides the electronic overload protection by the function executed by the processor; and adjusts the thermal trip level by the function executed by the processor in order to mimic adjusting a physical thermal characteristic of a thermal time constant of a fixed mechanical system.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: May 12, 2015
    Assignee: Eaton Corporation
    Inventors: Robert T. Elms, Sandy O. Jimenez, Engelbert Hetzmannseder
  • Publication number: 20140177118
    Abstract: A method provides electronic overload protection having a thermal trip level. The method executes a function by a processor; provides the electronic overload protection by the function executed by the processor; and adjusts the thermal trip level by the function executed by the processor in order to mimic adjusting a physical thermal characteristic of a thermal time constant of a fixed mechanical system.
    Type: Application
    Filed: December 21, 2012
    Publication date: June 26, 2014
    Applicant: EATON CORPORATION
    Inventors: ROBERT T. ELMS, SANDY O. JIMENEZ, ENGELBERT HETZMANNSEDER
  • Patent number: 8436739
    Abstract: A circuit breaker includes separable contacts, an operating mechanism structured to open and close the separable contacts, and a trip circuit including a trip coil and a fault detector. The fault detector energizes the trip coil to cause the operating mechanism to open the separable contacts. A test circuit is structured to test the trip coil and determine an open circuit condition thereof. An annunciation circuit is structured to annunciate the open circuit condition of the trip coil.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: May 7, 2013
    Assignee: Eaton Corporation
    Inventors: Robert T. Elms, William J. Murphy
  • Patent number: 8295016
    Abstract: A circuit interrupter includes first, second and third electrical conductors, a planar conductive member having first, second and third contacts, and an operating mechanism structured to move the planar conductive member toward the electrical conductors to electrically connect the first, second and third electrical conductors to the respective first, second and third contacts, and to move the planar conductive member away from the electrical conductors to electrically disconnect the electrical conductors from the contacts upon the occurrence of a predetermined condition, such that the electrical conductors are electrically isolated from each other. When one of the electrical conductors is welded to one of the contacts, the operating mechanism and the planar conductive member cooperate to electrically disconnect the other two of the electrical conductors from the other two of the contacts upon the occurrence of the predetermined condition.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: October 23, 2012
    Assignee: Eaton Corporation
    Inventor: Robert T. Elms
  • Publication number: 20120212864
    Abstract: A fail-safe ground fault circuit interrupter includes separable contacts; operating mechanism; and GF trip circuit including analog GF circuit having power supply input, and a number of: GF current transformer, first resistor in series with the GF CT, capacitor in parallel with this series combination, and second resistor between the power supply input and a common connection point between the first resistor and the capacitor, trip actuator cooperating with the OM, and zener diode including cathode interconnected with the power supply input and anode interconnected with the trip actuator, trip solenoid cooperating with the OM, bi-directional light emitting diode, and resistor in series with the LED, this series combination in parallel with the trip solenoid, and first silicon controlled rectifier cooperating with the OM, and second SCR cooperating with the OM, the second SCR in parallel with the first SCR.
    Type: Application
    Filed: February 21, 2011
    Publication date: August 23, 2012
    Inventors: ROBERT T. ELMS, Thomas E. Natili
  • Patent number: 8004418
    Abstract: A system includes a number of electrical switching apparatus having separable contacts, an operating mechanism structured to open and close the separable contacts, a trip mechanism cooperating with the operating mechanism to trip open the separable contacts, a test circuit structured to test the trip mechanism and determine a failure to protect condition thereof, and a communication circuit structured to communicate the failure to protect condition. The system also includes an electrical distribution panel having a housing housing the number of electrical switching apparatus, and a communication interface structured to receive the failure to protect condition from the communication circuit and annunciate the failure to protect condition.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: August 23, 2011
    Assignee: Eaton Corporation
    Inventors: Engelbert Hetzmannseder, William J. Murphy, Robert T. Elms
  • Patent number: 8004802
    Abstract: An operational amplifier circuit is for an arc fault circuit interrupter including a current sensor having a secondary and an envelope detector circuit having an input. The operational amplifier circuit includes a band pass filter having an input structured to be electrically interconnected with the secondary of the current sensor and an output; and a rectifier circuit. The rectifier circuit includes an operational amplifier having an input electrically interconnected with the output of the band pass filter and an output, a half-wave rectifier having an input electrically interconnected with the output of the operational amplifier, an output, and a forward voltage between the input and the output of the half-wave rectifier, the half-wave rectifier output being structured to be electrically interconnected with the input of the envelope detector circuit, and a voltage compensation circuit cooperating with the input and the output of the operational amplifier to compensate for the forward voltage.
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: August 23, 2011
    Assignee: Eaton Corporation
    Inventor: Robert T. Elms
  • Publication number: 20110075303
    Abstract: A circuit interrupter includes first, second and third electrical conductors, a planar conductive member having first, second and third contacts, and an operating mechanism structured to move the planar conductive member toward the electrical conductors to electrically connect the first, second and third electrical conductors to the respective first, second and third contacts, and to move the planar conductive member away from the electrical conductors to electrically disconnect the electrical conductors from the contacts upon the occurrence of a predetermined condition, such that the electrical conductors are electrically isolated from each other. When one of the electrical conductors is welded to one of the contacts, the operating mechanism and the planar conductive member cooperate to electrically disconnect the other two of the electrical conductors from the other two of the contacts upon the occurrence of the predetermined condition.
    Type: Application
    Filed: September 29, 2009
    Publication date: March 31, 2011
    Inventor: ROBERT T. ELMS
  • Patent number: 7746605
    Abstract: An arc fault circuit interrupter includes line and load terminals, separable contacts in series between the terminals, a neutral conductor, and an operating mechanism opening and closing the contacts and tripping open the contacts in response to a trip signal. A current transformer senses current flowing through the contacts. A voltage sensor detects voltage zero crossings between the load terminal and the neutral conductor. A processor detects a resistive series arc in series with the contacts. A processor routine determines, for each half cycle, samples of the sensed current, an offset value from an average of sensed current samples proximate the voltage zero crossings for the corresponding half cycle, adjusted sensed current samples as adjusted by the offset value, a profile corresponding to a resistive series arc as a function of the sensed current samples and the adjusted samples, and the trip signal in response to occurrences of the profile.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: June 29, 2010
    Assignee: Eaton Corporation
    Inventors: Robert T. Elms, Kevin L. Parker
  • Publication number: 20100123983
    Abstract: An operational amplifier circuit is for an arc fault circuit interrupter including a current sensor having a secondary and an envelope detector circuit having an input. The operational amplifier circuit includes a band pass filter having an input structured to be electrically interconnected with the secondary of the current sensor and an output; and a rectifier circuit. The rectifier circuit includes an operational amplifier having an input electrically interconnected with the output of the band pass filter and an output, a half-wave rectifier having an input electrically interconnected with the output of the operational amplifier, an output, and a forward voltage between the input and the output of the half-wave rectifier, the half-wave rectifier output being structured to be electrically interconnected with the input of the envelope detector circuit, and a voltage compensation circuit cooperating with the input and the output of the operational amplifier to compensate for the forward voltage.
    Type: Application
    Filed: November 19, 2008
    Publication date: May 20, 2010
    Inventor: ROBERT T. ELMS
  • Publication number: 20100060468
    Abstract: A circuit breaker includes separable contacts, an operating mechanism structured to open and close the separable contacts, and a trip circuit including a trip coil and a fault detector. The fault detector energizes the trip coil to cause the operating mechanism to open the separable contacts. A test circuit is structured to test the trip coil and determine an open circuit condition thereof. An annunciation circuit is structured to annunciate the open circuit condition of the trip coil.
    Type: Application
    Filed: September 8, 2008
    Publication date: March 11, 2010
    Inventors: ROBERT T. ELMS, WILLIAM J. MURPHY
  • Publication number: 20100060469
    Abstract: A system includes a number of electrical switching apparatus having separable contacts, an operating mechanism structured to open and close the separable contacts, a trip mechanism cooperating with the operating mechanism to trip open the separable contacts, a test circuit structured to test the trip mechanism and determine a failure to protect condition thereof, and a communication circuit structured to communicate the failure to protect condition. The system also includes an electrical distribution panel having a housing housing the number of electrical switching apparatus, and a communication interface structured to receive the failure to protect condition from the communication circuit and annunciate the failure to protect condition.
    Type: Application
    Filed: November 5, 2008
    Publication date: March 11, 2010
    Inventors: Engelbert Hetzmannseder, William J. Murphy, Robert T. Elms
  • Patent number: 7675721
    Abstract: A miniature circuit breaker includes separable contacts, an operating mechanism structured to open and close the separable contacts, a microprocessor including a thermal overload predictive function, and a shunt wire in series with the separable contacts. The shunt wire is structured to measure current flowing through the separable contacts for the thermal overload predictive function and an arc fault protective function.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: March 9, 2010
    Assignee: Eaton Corporation
    Inventor: Robert T. Elms
  • Publication number: 20100046126
    Abstract: A receptacle includes a housing, an input connection, an output connection, separable contacts structured to electrically connect the input connection and the output connection, an operating mechanism structured to open the separable contacts responsive to a trip signal, and a trip circuit. The trip circuit is structured to generate the trip signal responsive to current flowing to or from the output connection. The trip circuit includes a trip detection circuit and a semiconductor switching device. The semiconductor switching device is mounted within the housing and is located within about 0.25 inch of the input connection or the output connection. The semiconductor switching device is structured to generate the trip signal responsive to the trip detection circuit and responsive to overheating of the input connection or the output connection, respectively.
    Type: Application
    Filed: August 20, 2008
    Publication date: February 25, 2010
    Inventor: Robert T. Elms
  • Patent number: 7633736
    Abstract: A circuit breaker includes separable contacts, an operating mechanism structured to open and close the separable contacts, and a trip mechanism. The trip mechanism includes a sensor structured to sense current flowing through the separable contacts, a processor cooperating with the sensor to determine a plurality of different trip conditions responsive to the sensed current, a nonvolatile memory operatively associated with the processor, and a trip actuator cooperating with the processor and the operating mechanism to trip open the separable contacts responsive to one of the different trip conditions from the processor. The processor is structured to save in and retrieve from the nonvolatile memory cause-of-trip information for the different trip conditions including the one of the different trip conditions.
    Type: Grant
    Filed: June 23, 2006
    Date of Patent: December 15, 2009
    Assignee: Eaton Corporation
    Inventors: Thomas A. Domitrovich, Robert T. Elms, Kevin L. Parker
  • Patent number: 7633728
    Abstract: An arc fault circuit interrupter includes separable contacts, an operating mechanism, a current sensor sensing current flowing through the contacts and outputting a sensed current, and a processor determining and storing peak values of the sensed current for plural half-cycles. The processor provides arc fault detection, determines whether a first predetermined plurality of half-cycles occur in succession and correspond to non-unity power factor, and responsively inhibits the detection for a first predetermined time, and whether a second predetermined plurality of half-cycles occur in succession, each with smaller peak amplitude than that of an immediately preceding half-cycle of like or differing polarity, and responsively inhibits the detection for a second predetermined time.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: December 15, 2009
    Assignee: Eaton Corporation
    Inventors: Kevin L. Parker, Robert T. Elms
  • Patent number: 7518840
    Abstract: A receptacle includes a line conductor, a load conductor, a neutral conductor, a load neutral conductor, a ground conductor, first separable contacts electrically connected between the line and load conductors, and second separable contacts electrically connected between the neutral and load neutral conductors. An operating mechanism is structured to open and close the first and second separable contacts. A number of voltages are input from at least some of the conductors. An electronic trip mechanism automatically detects: (a) an arc fault trip condition, and (b) a second different miswiring condition from the voltages and cooperates with the operating mechanism to trip open the separable contacts in response to the automatically detected miswiring condition.
    Type: Grant
    Filed: February 14, 2006
    Date of Patent: April 14, 2009
    Assignee: Eaton Corporation
    Inventor: Robert T. Elms
  • Publication number: 20090040666
    Abstract: A circuit interrupter includes separable contacts, a neutral conductor, an operating mechanism structured to open and close the separable contacts, and a plurality of current sensors structured to sense at least current flowing through the separable contacts. Each of the current sensors includes a primary winding and a secondary winding, the primary winding being electrically connected in series with the separable contacts. A trip mechanism is structured to cooperate with the secondary winding of the current sensors and the operating mechanism to trip open the separable contacts. A test circuit tests the current sensors and the trip mechanism. The test circuit is structured to apply a test signal directly to the secondary winding of each of the current sensors.
    Type: Application
    Filed: August 7, 2007
    Publication date: February 12, 2009
    Inventors: ROBERT T. ELMS, Kevin L. Parker, Theodore J. Miller
  • Publication number: 20090040665
    Abstract: An arc fault circuit interrupter includes line and load terminals, separable contacts in series between the terminals, a neutral conductor, and an operating mechanism opening and closing the contacts and tripping open the contacts in response to a trip signal. A current transformer senses current flowing through the contacts. A voltage sensor detects voltage zero crossings between the load terminal and the neutral conductor. A processor detects a resistive series arc in series with the contacts. A processor routine determines, for each half cycle, samples of the sensed current, an offset value from an average of sensed current samples proximate the voltage zero crossings for the corresponding half cycle, adjusted sensed current samples as adjusted by the offset value, a profile corresponding to a resistive series arc as a function of the sensed current samples and the adjusted samples, and the trip signal in response to occurrences of the profile.
    Type: Application
    Filed: August 7, 2007
    Publication date: February 12, 2009
    Inventors: ROBERT T. ELMS, Kevin L. Parker
  • Patent number: 7486492
    Abstract: A receptacle includes separable contacts, an operating mechanism structured to open and close the separable contacts, and two trip circuits. A first microprocessor-based trip circuit includes a first output having a first arc fault/ground fault trip signal, and a second output having a periodic pulsed signal. A second failsafe trip circuit includes an input having the periodic pulsed signal and an output having a second trip signal. The second failsafe trip circuit is structured to output the second trip signal responsive to failure of the first microprocessor-based trip circuit to provide the periodic pulsed signal. A third circuit responds to the first trip signal and the second trip signal and cooperates with the operating mechanism to trip open the separable contacts.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: February 3, 2009
    Assignee: Eaton Corporation
    Inventor: Robert T. Elms