Electrical current transfer between rotatable members

Details Electrical current transfer between rotatable members Electrical current transfer between rotatable members

H - Electricity

01

R

339/3

H01R 39/00 (2006.01) H01R 43/20 (2006.01)

Patent

CA 1085008

ABSTRACT OF THE DISCLOSURE A full rotational freedom, substantially zero friction electrical contact assembly for conducting electrical currents between relatively rotatable members of sensitive instruments such as gyroscopic devices and the like and a method of and apparatus for the assembly thereof is disclosed. Each electrical transfer unit of the assembly comprises a pair of coaxial, concentric, coplanar, continuous, concave conductor rings, one mounted on a relatively fixed member and the other mounted on the rotatable member, the relative diameters of the rings providing a substantial annular radial gap therebetween. A resilient, electrically conducting, continuous, filamentary loop is disposed in the radial gap such that its generally flat outside surface contacts and rolls on the concave surfaces of the concentric conductor rings. The loop/conductor interface provides self-capturing and retaining forces to accommodate any misalignment between the rings and movements of the loop within the radial gap in a vibratory and/or shock environment all without producing frictional torques on the rotatable member. The critical dimensional parameters of the concave conductor ring surface and the loop, particularly its free (unassembled) diameter relative to the radial distance between the concentric conductors, its thickness and width, and its material characteristics are selected so as to provide: substantially zero friction and coupling torque on the rotatable member; maximum retention capability; maximum current conduction; and maximum life. In another aspect of the invention, the assembly is designed such that the loops may be readily assembled without deforming, overstressing or damaging the same while permitting loops of various acceptable free diameters and hence preloads to be employed, and furthermore, the design of the assembly allows the selection of ring concavities of various depths to satisfy the vibratory and shock environment of various applications. -2-

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