Double-helix zero insertion force connector system

Abstract

A zero insertion force type connector system provides a receptacle with variable inside diameter for typical use in cooperation with a solid elongated pin, typically or round cross-section, as the opposite member of a mating connector pair. The receptacle is configured as a double-helix formed from a single length of wire which may be a stripped length of insulated hookup wire thus providing two integrally connected insulated leads for highly reliable external interconnections, which may include coaxial cables. The double-helix is formed into a diametric loop at one end of the double-helix, and the other end is constrained against rotation by a pair of leads emerging at diametrically opposite sides captured within conduit slots of a protective insulated casing. The loop is engaged and rotationally driven by a slotted drive head to vary the inside diameter of the receptacle, typically expanding it to provide zero insertion force during pin entry, following which, upon removal of the external drive head torque, internal spring tension of the wire causes the coils of the double-helix to grip the pin and provide electrical contact pressure. Alternatively part of all of the total contact pressure may be provided from an external torque source via the drive head and the loop, preferably including resilient linkage such as spring lever arms to maintain constant torque, and particularly in the case of multiple contact connector assemblies, to evenly distribute torque to multiple double-helix receptacles.