Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-10-03
1982-09-14
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
307116, 324251, 335206, 335207, 338 32H, 340644, 340686, 361179, G08B 1900, H01L 2982
Patent
active
043498140
ABSTRACT:
An electrical switching device for use on machinery to prevent machine operation unless safety guards or the like are correctly positioned comprises two separate parts one part including at least two Hall effect devices which respond to magnetic poles of opposite polarity and electronic switching means which is actuated only when all the Hall effect devices are triggered simultaneously, and the other part including a corresponding number of magnets positioned to actuate the respective Hall effect devices when the two switch parts are placed in close proximity and predetermined orientation. The switch is substantially tamper proof and a control circuit can detect any unauthorized attempt to override the switch.
REFERENCES:
patent: 3419798 (1968-12-01), Walton
patent: 3473109 (1969-10-01), Maaz et al.
patent: 3558934 (1971-01-01), Dorsch et al.
patent: 3657686 (1972-04-01), Masuda et al.
patent: 3680026 (1972-07-01), Masuda et al.
patent: 3718920 (1973-02-01), Grenier
patent: 4199741 (1980-04-01), Serrus Paulet
Caldwell Sr. John W.
Duraplug Electricals Limited
Nowicki Joseph E.
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