Square D Company

Bandag Licensing Corporation

William J Bacher

Leon W Durivage, Iii

Jeffrey J Corpstein

A fault-powered, processor-based circuit breaker tripping system employs a reliable low power trip indicator circuit that is normally powered from the tripping system. A liquid crystal display is used to indicate the status of the system, and a battery is used as a secondary power source after a trip terminates the power to the system. The battery is enabled by a manual switch or by a latch which responds to one of a plurality of trip signals from the processor. The latch also provides signals to a driver circuit to drive the LCD. Once enabled, the battery provides power to the latch and the LCD so that the cause of the trip may be displayed during a power fault. The manual switch can be used to select status signals to be displayed on the LCD, and to indicate the condition of the battery. The LCD includes a segment for indicating that the system is energized and power is being drawn from the current path but that amount of power is below all fault levels and insufficient to operate the system.

Processor controlled circuit breaker trip system having reliable status

A tread depth probe for measuring the depth of a tread groove in a tire comprising a retaining and release mechanism to retain the probe pin in a retracted position when not in use and a release mechanism to release the probe pin when in use and having a measuring system permitting multiple tire groove depth readings while permitting the tread depth probe to be in the released position.

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Cedar Rapids, IA, United States of America

William J Bacher