Patents Assigned to E.O. Schweitzer Manufacturing Company, Inc.
  • Patent number: 6894478
    Abstract: A fault indicator for indicating the occurrence of a fault in an electrical conductor has a housing, a high capacity battery, a display for indicating the occurrence of a fault, a current sensor for sensing the load current in a monitored conductor a microcontroller for determining the load current, for selecting one of a plurality of trip settings, such as in several steps between 50 A and 1200 A, based upon the determined load current and for determining that a fault condition occurred when the load current exceeds the trip setting. The selected trip setting is stored in memory. The load current is periodically sampled and the trip setting is changed if the load current falls in a different range. The display may include permanent and temporary fault indicating LEDs and additional internal LEDs that cause the housing to glow or flash at nighttime, or a target style display may be used. Upon the load current exceeding the trip setting, the microcontroller begins flashing the permanent fault LEDs.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: May 17, 2005
    Assignee: E.O. Schweitzer Manufacturing Company, Inc.
    Inventor: Kurt J. Fenske
  • Patent number: 6822576
    Abstract: A fault indicator for monitoring an electrical conductor has a housing, an indicator flag or a light emitting diode (LED) that becomes visible from the exterior of the fault indicator upon the occurrence of a fault, and electronic circuitry for sensing a fault, for actuating the indicator flag or LED to a fault indicating condition and for resetting the indicator flag or LED to a non-fault indicating condition a predetermined time after the fault has occurred. An overload indicator provides an overload indication, such as a fast flash rate, for a predetermined time when an overload threshold is exceeded, and provides a different overload indication, such as a slow flash rate, for a predetermined time when the line current in the monitored conductor falls below the threshold.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: November 23, 2004
    Assignee: E.O. Schweitzer Manufacturing Company, Inc.
    Inventors: Laurence Virgil Feight, Kurt James Fenske