Geometrical instruments
Patent
1984-01-30
1985-08-06
Rubinson, Gene Z.
Geometrical instruments
339 8R, H01R 3500
Patent
active
045337969
ABSTRACT:
This low friction rotatable electrical connector is for use with coiled telephone cords to prevent the cord from becoming twisted and knotted-up. This connector is generally of insulating material formed by a hollow inner cylindrical member telescoped within a hollow outer cylindrical member. A pair of ball bearing members support the outer member on the inner member for rotation about a central longitudinal axis. The inner member has a single longitudinal split in one side for receiving a plurality of continuous conductive rings on the outer surface when the inner member is squeezed, and a first set of flexible insulated conductors extend through the interior of the inner member and then through this split for connection to these rings. A plurality of apertures are formed in the wall of the outer member in alignment with the conductive rings, and these apertures contain spring-biased balls in rolling contact with the rings. The exterior of the outer member supports a plurality of split conductive rings that are in alignment with the continuous rings of the inner member as well as with certain of the spring-biased balls so as to maintain good electrical continuity between the innermost continuous rings and the outermost split rings. A second set of flexible insulated conductors are joined to these split rings at one end and to a male electrical plug at the outermost end of the outer member. An insulated sleeve is fitted over the outer member, and it may include a hollow ball and socket joint that supports the male plug when the connector is fixedly mounted to the telephone base or hand set.
REFERENCES:
patent: 1894187 (1933-01-01), McGregor
patent: 2414957 (1947-01-01), Larraburre
patent: 2941177 (1960-06-01), Merritt
patent: 3123421 (1964-03-01), Phillips
patent: 3387250 (1968-06-01), Bjorn
patent: 3437976 (1969-04-01), Welson
Caslin Richard L.
Rubinson Gene Z.
Schroeder L. C.
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