Electricity: circuit makers and breakers – Multiple circuit control – Pivoted contact
Patent
1974-08-05
1976-01-27
Miller, J. D.
Electricity: circuit makers and breakers
Multiple circuit control
Pivoted contact
200144AP, 317 2B, A61N 114, H05F 304
Patent
active
039355080
ABSTRACT:
A method and apparatus for protecting the sensitive electronic or magnetic circuitry of modern business machines, mini-computers, and the like, while preventing the operator thereof from experiencing any discomfort. A high voltage discharge switch attachable to such a machine is used to discharge an accumulated charge of static electricity from the machine operator's body in approximately one tenth of a second without causing any discomfort. The high voltage switch employs an upper finger touch contact having a sharp point which, when depressed by the machine operator, comes into close proximity with a lower contact which is coupled through a resistive means to the frame of the machine and causes a corona discharge from the sharp point which initiates the transfer of at least a portion of the stored electrostatic charge prior to actual contact between the sharp point and the lower contact such that the transferred electrostatic charge is effectively dissipated through the resistive means without the usual spark-gap-type shock-producing discharge which usually results when actual contact is made thereby avoiding any discomfort to the machine operator and avoiding spurious signals which could produce errors in the state of sensitive logic circuits, memories or the like.
REFERENCES:
patent: 3099774 (1963-07-01), Crane
patent: 3577208 (1971-05-01), Petrick
patent: 3621164 (1971-11-01), Backer
patent: 3780345 (1973-12-01), Earman, Jr.
IBM Technical Disclosure Bulletin, Vol. 15, No. 7, (Dec. 1972), pp. 2200-2201, "Protection Against Electrostatic Noise."
Burroughs Corporation
Fish Paul W.
Miller J. D.
Moose Jr. Harry E.
Padgett, Jr. Charles P.
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