Patent ID: 8753030

Claim:
A knuckle for mounting an electrical device, comprising a knuckle mount; a first knuckle element rotatably mounted on the knuckle mount about a first axis, the first knuckle element including a first open cavity and a first wire passageway from the mount to the first open cavity; a second knuckle element including an electrical device mount, a second open cavity and a second wire passageway from the electrical device mount to the second open cavity, the second open cavity having an inner surface of rotation about a second axis perpendicular to the first axis, which is a segment of a sphere or spheroid, the first and second knuckle elements mating together to define a closed cavity from the first and second open cavities; a grommet positioned in the closed cavity, the grommet being in non-rotational engagement with the first open cavity, the grommet including an outer surface of rotation about the second axis in the second open cavity, the inner and outer surfaces of rotation being complementary with an interfering fit; a fastener extending along the second axis engaging the first and second knuckle elements through the closed cavity, the grommet being drawn into interference fit with the inner surface of rotation.