High-force spring probe with improved axial alignment

Details High-force spring probe with improved axial alignment High-force spring probe with improved axial alignment

1996-10-16

1998-04-28

Karlsen, Ernest F.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

439482, G01R 3102

Patent

active

057449775

ABSTRACT:
A high-force spring probe comprises a hollow barrel, a plunger disposed for sliding axial travel within the barrel, a plunger tip outside of the barrel for contacting a unit under test, and a plunger bearing inside the plunger end of the barrel. The plunger includes an elongated intermediate section that extends between the tip and bearing section of the plunger. The barrel includes a crimped portion immediately inside the plunger end of the barrel that engages the bearing section, and retains the plunger in the barrel. A coil spring is disposed within the barrel between a terminal end of the barrel and the plunger bearing section. The spring has a diameter approximately matching equal to the inside diameter of the barrel. The plunger includes a reduced diameter spring control section that extends axially from the bearing section along the center of the spring. The spring control section of the plunger has an outside diameter that approximately matches an inside diameter of the spring. The spring extends a major length of the barrel inside diameter, in one embodiment at least 90 percent of the length of the barrel, and this long spring greatly increases the spring force applied by the spring and to the plunger.

REFERENCES:
patent: 4105970 (1978-08-01), Katz
patent: 4438397 (1984-03-01), Katz
patent: 4508405 (1985-04-01), Damon et al.
patent: 4560223 (1985-12-01), Cooney et al.
patent: 4724383 (1988-02-01), Hart
patent: 5225773 (1993-07-01), Richards

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