Patent ID: 7949312
Filing Date: 2011-05-24
Classification: H04M

Abstract:
1. A bi-axial swivel assembly comprising: a pair of coaxial bearings located at positions distanced from each other; a pair of support shafts respectively supported on the coaxial bearings for relative rotation; a first hollow space extending at least within one of the support shafts in an axial direction of the support shafts, the first hollow space penetrating through the bearing corresponding to the one of the support shafts; a support member interposed between the support shafts, the support member coupled with the support shafts based on integral formation; a tube supported on the support member, the tube extending along a rotation axis perpendicular to an imaginary plane including a longitudinal axis of the support shafts; a second hollow space extending within the tube in an axial direction of the tube, the second hollow space penetrating through at least the support member, the second hollow space being connected to the first hollow space; a shaft cover supported on the tube for relative rotation around the rotation axis; a bracket coupled to the shaft cover; perpendicular surfaces defined on the bearings along imaginary reference planes perpendicular to the longitudinal axis of the support shafts, respectively; a restriction cam coupled to the shaft cover, the restriction cam extending in a centrifugal direction of the rotation axis, the restriction cam lying inside the imaginary reference planes when the bracket takes a first attitude, the restriction cam protruding outside at least one of the imaginary reference planes when the bracket takes a second attitude established through rotation by 90 degrees around the rotation axis from the first attitude; and recesses formed on the perpendicular surfaces, respectively, the recesses receiving the restriction cam protruding outside the imaginary reference planes.