Browse Prior Art Database

Zero Insertion Force Coil Contact Element

IP.com Disclosure Number: IPCOM000086005D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Buyck, WJ: AUTHOR [+3]

Abstract

The contact element, shown in Fig. 1, consists of a small diameter wire tightly wound in a coil having a larger diameter in the center and tapering to a smaller diameter on the end. The small end has an ID slightly larger than the pin to be contacted, while the middle section OD is sufficiently large to make a press fit into a hole in the housing.

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Zero Insertion Force Coil Contact Element

The contact element, shown in Fig. 1, consists of a small diameter wire tightly wound in a coil having a larger diameter in the center and tapering to a smaller diameter on the end. The small end has an ID slightly larger than the pin to be contacted, while the middle section OD is sufficiently large to make a press fit into a hole in the housing.

Electrical properties of the coil wire can be improved by plating the wire (before winding) or the coil (after winding) with gold or other metal with good contact properties. A contactor or socket is made by arranging any number of the contact elements in the desired pattern in a single housing or connector block.

In operation, the part having pins to be contacted is aligned to the connector housing with the pins axially entering the open end of the contact coil. This is the "zero insertion force" stage and is shown in Fig. 1. The activation stage is accomplished by moving the pin laterally relative to the coil. This causes the coil to deflect making mechanical and electrical contact between several individual turns of the coil and the pin, as is shown in Fig. 2.

Electrical connection to the opposite end of the coil contact element can be through another pin, or by soldering a wire or other conductor into the reduced diameter portion of the coil contact.

This contact arrangement provides a low-cost contact having high-electrical reliability and which is easily manufactured with...