Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1990-06-12
1991-03-26
Wieder, Kenneth
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 725, 324158F, G01R 106, G01R 3102
Patent
active
050032550
ABSTRACT:
An electric contact probe, including: a needle member made of electroconductive material having a pointed free end, a rod portion having a smaller diameter than the rod portion, and a head portion provided at another end of the stem portion; a tubular receptacle receiving a base end of the needle member therein in an axially slidable manner; a compression coil spring wrapped around the stem portion between an annular shoulder surface between the rod portion and the stem portion, and the head; an annular contricted part provided in the tubular receptacle to restrict axially inward movement of an axially inner end of the compression coil spring; and a small radially inward projection provided in the receptacle a small distance away from the constricted part toward the free end of the needle member to detachably engage an axially inner end portion of the compression oil spring. Thus, the needle member assembly may be readily installed and removed as desired so as to facilitate the fabrication and the maintenance of the contact probe system. Furthermore, since the outer diameter of the compression coil spring may be increased up to the inner diameter of the receptacle, the spring force of the compression coil spring can be increased to a sufficient extent to ensure a stable state of contact at the pointed end of the needle member.
REFERENCES:
patent: 4658212 (1987-04-01), Ozawa et al.
patent: 4904935 (1990-02-01), Calma et al.
Nguyen Vinh P.
NHK Spring Co. Ltd.
Wieder Kenneth
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