Patent ID: 8753129

Claim:
A hinge for an aircraft power distribution system unit, the unit having a housing comprising a first housing part and a second housing part, the hinge comprising: a first hinge member for connection to the first housing part of the unit; and a second hinge member for connection to the second housing pan of the unit, wherein the first and the second hinge members comprise an electrically conductive material and wherein the first and the second hinge members are connectable to one another to establish an electrical connection between the first and the second hinge members and to allow relative rotation between the first and the second hinge members, wherein the first hinge member comprises a receptacle and the second hinge member comprises a protrusion for engagement in the receptacle, wherein the receptacle comprises a hyperboloid socket for receiving the protrusion, the hyperboloid socket haying a cylindrical cavity, wherein the protrusion is cylindrical and adapted for mating insertion in the cylindrical cavity, wherein the hyperboloid socket provides an internal constriction to facilitate fixture of the protrusion within the socket and electrical connection between the first and second hinge members.