Geometrical instruments
Patent
1981-07-13
1983-09-06
Desmond, Eugene F.
Geometrical instruments
339 14R, 339147R, H01R 466
Patent
active
044025602
ABSTRACT:
A system is described for grounding individuals involved in the assembly or repair of electronic components that are electrostatic sensitive. The system includes a wrist strap of conductive material having one element of an electrical connector connected thereon. A length of copper ground lead is connected at one end by way of a resistor to a metal connecting element designed to meet with the connector on the wrist strap. A woven shield preferably of nylon completely encloses the ground lead and terminates adjacent to the connection to the resistor. A housing of insulating material is provided having a central portion for receiving the resistor and the end portions of the nylon braid and the copper ground lead. The receiving portion of the housing is filled with an insulated material such as epoxy firmly to bond the resistor and portions of the ground lead and insulating braid to the structure of the housing. The housing is also provided with a flange-like structure extending beyond the receiving portion to enable disconnection of the electrical contact by readily pulling up or otherwise applying force to the flange which reduces fatigue in the copper ground lead during a significant number of connections and disconnnections. There is also provided an electrical connecting means at the opposite end of the copper ground lead for making conductive connection to a ground position at a work station.
REFERENCES:
patent: 4112941 (1978-09-01), Larimore
patent: 4280506 (1981-07-01), Zurcher
"Product Specification", Charleswater Products Inc. CP401R Statfree Wrist Strap.
Advertisement, Westcorp, "Electrically Conductive Wrist Straps W-0740 & W-O741.
Desmond Eugene F.
Scherback William J.
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