Method and apparatus for preventing erroneous operation in non-c

Details Method and apparatus for preventing erroneous operation in non-c Method and apparatus for preventing erroneous operation in non-c

1990-04-20

1993-12-21

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

250229, H01J 156

Patent

active

052723836

ABSTRACT:
To detect a faulty operation in a non-contact switch, a pulse signal is applied to the light emitting element of non-contact switch. The thus input pulse signal is compared with an output signal generated by a light receiving element of the non-contact switch. The faulty operation of the non-contact switch is discriminated in accordance with the thus compared input and output signals. Also to detect a faulty operation of the non-contact switch, a switch assembly includes a main push-button and an auxiliary push-button concentrically located over and within the main push-button. When the main push-button operates properly, the blocking members associated with the main push-button and the auxiliary push-button are displaced together. On the other hand, when the main push-button malfunctions, the light blocking member of the auxiliary push-button blocks the passage of light within the non-contact switch. Thus, an erroneous operation resulting from jamming of the main push-button is prevented.

REFERENCES:
patent: 4417824 (1983-11-01), Paterson et al.
patent: 4442425 (1984-04-01), Eibner
patent: 4641026 (1987-02-01), Garcia, Jr.
patent: 4774407 (1988-09-01), Erbe
patent: 4795900 (1989-01-01), Kokubu
patent: 4816671 (1989-03-01), Umemura
patent: 4855590 (1989-08-01), Bures et al.

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