Foolproof electric switch incorporating hall effect devices

Details Foolproof electric switch incorporating hall effect devices Foolproof electric switch incorporating hall effect devices

F - Mech Eng,Light,Heat,Weapons

16

P

342/15, 342/17

F16P 3/00 (2006.01) G05B 9/00 (2006.01) G08B 19/00 (2006.01) H03K 17/97 (2006.01)

Patent

CA 1155172

FOOLPROOF ELECTRIC SWITCH INCOR- PORATING HALL EFFECT DEVICES 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 un- authorized attempt to override the switch.

361981

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