Switch with end of life prediction capability

Details Switch with end of life prediction capability Switch with end of life prediction capability

1994-01-11

1995-05-30

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 34030915, 200 47, 364550, G08B 2100

Patent

active

054205719

ABSTRACT:
A monitoring device is provided for use in association with a limit switch or similar mechanically actuated device in order to permit its end of life to be predicted. The system uses nonvolatile random access memory to store a count which represents the number of occurrences of one of two alternative events. The first event is the occurrence of a number of switch actuations and the second event is the lapse of a predetermined period of time. When either of these two events occurs, a microprocessor increments a count in the nonvolatile memory unit and clears both the clock and the volatile memory parameter. When the number stored in the nonvolatile memory represents a number of actuations estimated to be appropriately equal to the total life of the switch, this condition can be signaled to a sensor bus by a communication circuit. Alternatively, a light emitting diode can be alternately energized and de-energized to represent the number of actuations having exceeded the predicted end of life total.

REFERENCES:
patent: 4163360 (1979-08-01), Tanaka et al.
patent: 4598248 (1986-07-01), Germer
patent: 4742476 (1988-05-01), Schwartz et al.
patent: 4992777 (1991-02-01), Keisuke et al.
patent: 5021828 (1991-06-01), Yamaguchi et al.

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