Compliant press-fit pin having compliant cantilever beam

Details Compliant press-fit pin having compliant cantilever beam Compliant press-fit pin having compliant cantilever beam

1999-12-17

2001-04-10

Paumen, Gary F. (Department: 2833)

Electrical connectors

With insulation other than conductor sheath

Metallic connector or contact secured to insulation

Reexamination Certificate

active

06213817

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a compliant press-fit pin; and, more particularly, to the compliant press-fit pin having a compliant cantilever beam for the sake of electrically coupling a daughter plane to a backplane via a plated through hole formed in the backplane.
DESCRIPTION OF THE PRIOR ART
Generally, a one-piece connector has been employed as a connector for connecting a daughter plane to a backplane in a communication system. Further, a two-piece connector has been employed to improve signal processing, signal transmission speed and packaging density.
The two-piece connector includes a solder type of the two-piece connector and a solderless type of the two-piece connector. Because of a disadvantage of the solder type of the two-piece connector, the solderless type of the two-piece connector is preferred.
The solderless type of the two-piece connector includes a rigid body pin and a compliant press-fit pin. The compliant press-fit pin is press-fit into a plated through hole formed in the backplane. The compliant press-fit pin includes C, N, M, S and V types of compliant press-fit pins according to a sectional shaped configuration and an action pin as a division type of the compliant press-fit pin.
However, there is a problem that the conventional compliant press-fit pin is disadvantageous in commercialization where a size of the plated through hole is reduced according to high packing density of the communication system.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a compliant press-fit pin for electrically coupling a daughter board to a backplane via a plated through hole formed in the backplane that is capable of providing optimum insertion force and retention force.
In accordance with an aspect of the present invention, there is provided a compliant press-fit pin for electrically coupling a first board to a second board via a plated through hole formed in the second board, comprising: an upper part for electrically fixing the first board; a lower part for electrically coupling the first board to a third board via the plated through hole formed in the second board; and a press-fit part located between said upper part and said lower part and containing a fixed beam and a compliant cantilever beam, for electrically coupling the first board fixed to said press-fit part to the second board, wherein the fixed beam and the compliant cantilever beam provide a retention force against a wall of the plated through hole, thereby electrically press-fitting the compliant press-fit pin into the plated through hole, when said press-fit part is inserted into the plated through hole.


REFERENCES:
patent: 3846741 (1974-11-01), Kunkle et al.
patent: 4186982 (1980-02-01), Cobaugh et al.
patent: 4897053 (1990-01-01), Verhoven et al.
patent: 5564954 (1996-10-01), Wurster
patent: 5738550 (1998-04-01), Sakuraoka et al.
patent: 5743769 (1998-04-01), Koguchi
Tsuneo Kanai et al., “Design of Compliant Press-Fit Pin Connection”, IEEE Transactions of Components, Hybrids, and Manufacturing Technology, vol. CHMT-8, No. 1, Mar. 1985.

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