Electricity: electrical systems and devices – Discharging or preventing accumulation of electric charge
Patent
1986-11-07
1988-05-24
Hix, L. T.
Electricity: electrical systems and devices
Discharging or preventing accumulation of electric charge
361220, 297217, H05F 302
Patent
active
047470119
ABSTRACT:
A chair for discharging static electricity carried by an occupant has a seat covering and an electrode under the covering for permitting the occupant to safely touch a source of current having a moderate voltage of less than about 200 volts, without being shocked thereby. When the charge exceeds a predetermined level, current flows through the covering between the occupant and the conductor, discharging the occupant. The electrode can be a flexible wire or a resilient foam member. A current limiting resistor protects the occupant from high discharge currents. In a preferred version, there are two of the resistors connected in parallel for fall-safe operation. The chair can have a wheeled base of electrically conductive construction for grounding the chair. The chair can incorporate a hydraulic cylinder for permitting height adjustments and swivelling of the seat, it being preferred that the two current limiting resistors be incorporated in the cylinder for including structure under the seat in the protection from high discharge currents, and for ease of manufacture. In one version of the chair, a discrete breakdown device prevents discharge from moderate voltages and the covering can be made conductive.
REFERENCES:
patent: 2858482 (1958-10-01), Nutter
patent: 4208696 (1980-06-01), Lindsay et al.
patent: 4307144 (1981-12-01), Sanders et al.
patent: 4513347 (1985-04-01), Wilcox et al.
patent: 4625257 (1986-11-01), Lissner
"Condulon Low & High Density Conductive Foams" brochure, Bemis Company, Minneapolis, Minn., 5-1-82.
Anti-Static and Conductive Foam brochure, Controlled Static, Santa Fe Springs, Calif.
Gray David M.
Hix L. T,.
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