Patents by Inventor Dermot Hurst

Dermot Hurst 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).

  • Circuit breaker
    Patent number: 6160470
    Abstract: A circuit breaker includes an upper rail mounting device defined by a line terminal having a pair of spaced-apart jaws. A bimetal is adjusted by means of a calibration screw. An aperture is provided in an upper sidewall portion of a base of the circuit breaker for access to the calibration screw by a calibration device. The aperture is positioned so that the calibration device must pass through the jaws of the upper rail mounting device. This ensures that the calibration screw can only be operated when the circuit breaker is disconnected from an electrical supply.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: December 12, 2000
    Inventors: Thomas O'Carroll, Desmond Regan, Dermot Hurst
  • Circuit breaker
    Patent number: 5285180
    Abstract: A method of manufacturing a circuit breaker comprises the steps of preassembling the movable parts of the circuit breaker between a pair of frame members and providing a housing that is configured for supporting the unitary breaker assembly without attachments. Other circuit breaker components, attached to the unitary breaker assembly, are also supported in the housing without attachments. A cover is secured to the housing to complete the circuit breaker. Another version of the invention preassembles the movable parts of the circuit breaker and the stationary contact mechanism and trip coil, with the line and load terminals attached, between a pair of supporting frame members to form an operable circuit breaker module. The module is in turn supported in a housing without attachments. The circuit breaker module may be tested and adjusted prior to final assembly.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: February 8, 1994
    Assignee: Square D Company
    Inventors: Willard J. Rezac, Thomas A. Edds, Lowell D. Smith, James Early, Martin Donnellan, Dermot Hurst
  • Method of manufacturing a circuit breaker
    Patent number: 5097589
    Abstract: A method of manufacturing a circuit breaker comprises the steps of preassembling the movable parts of the circuit breaker between a pair of frame members and providing a housing that is configured for supporting the unitary breaker assembly without attachments. Other circuit breaker components, attached to the unitary breaker assembly, are also supported in the housing without attachments. A cover is secured to the housing to complete the circuit breaker. Another version of the invention preassembles the movable parts of the circuit breaker and the stationary contact mechanism and trip coil, with the line and load terminals attached, between a pair of supporting frame members to form an operable circuit breaker module. The module is in turn supported in a housing without attachments. The circuit breaker module may be tested and adjusted prior to final assembly.
    Type: Grant
    Filed: June 19, 1991
    Date of Patent: March 24, 1992
    Assignee: Square D Company
    Inventors: Willard J. Rezac, Thomas A. Edds, Lowell D. Smith, James Early, Martin Donnellan, Dermot Hurst