Electroconductive contact unit having compression spring with no

Details Electroconductive contact unit having compression spring with no Electroconductive contact unit having compression spring with no

1997-06-27

1999-11-23

Strecker, Gerard

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324 725, 324754, 439841, G01R 1067, G01R 104, G01R 3102, H01R 1324

Patent

active

059906979

ABSTRACT:
In an electroconductive contact unit including a pair of needle members projecting from either end of a holder arrangement, and an electroconductive compression coil spring interposed therebetween for resiliently urging the needle members away from each other, the compression coil spring comprises a normally wound segment and a coarsely wound segment. When the contact unit is applied to an object to be contacted, the adjacent turns of the coil wire of the normally wound segment are brought into contact with each other so that the electric path between the needle members is substantially straight along the length of the coil spring with the coarsely wound segment. Therefore, by selecting the number of turns and the coil pitch of the coarsely wound segment of the compression coil spring, it is possible to minimize the electric impedance and the electric resistance of the compression coil spring while meeting the requirements of the compression coil spring for providing a required resiliency to the needle members.

REFERENCES:
patent: 3364302 (1968-01-01), Slick
patent: 5014004 (1991-05-01), Kreibich et al.
patent: 5084673 (1992-01-01), Kazama
patent: 5189364 (1993-02-01), Kazama
patent: 5200695 (1993-04-01), Kazama
patent: 5410260 (1995-04-01), Kazama
patent: 5414369 (1995-05-01), Kazama
patent: 5631574 (1997-05-01), Kazama
patent: 5798655 (1998-08-01), Kazama et al.

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