Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-03-11
1992-01-28
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29857, H01R 4300
Patent
active
050833677
ABSTRACT:
An inexpensive grounding wrist strap and tether for draining excess electrostatic charge, which may be used once and then disposed. The strap and tether are formed integrally and include a conductive strip having a discrete resistance portion for safety considerations. The discrete resistance portion is formed by making a zig-zag pattern of cuts in the conductive strip, thereby increasing the length of the current path through the discrete resistance portion. Due to the slight resistivity of the conductive strip, the lengthened current path results in a discrete resistance being built into the strip. The cuts may be made in the strip at the same time the strip is fashioned out of a sheet of the conductive material, such as carbon loaded polyethylene.
REFERENCES:
patent: 3857397 (1974-12-01), Brosseau
patent: 4475141 (1984-10-01), Antonevich
patent: 4698724 (1987-10-01), Burvee
patent: 4847729 (1989-07-01), Hee
patent: 4878148 (1989-10-01), Hee
Echols P. W.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Musgrove Jack V.
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