Patent ID: 8055006

Claim:
A headphone unit, comprising: a foldable headband including: a first arm; a second arm; and a hinge connecting the first arm to the second arm, wherein the first arm and the second arm are rotatable between a first angle and a second angle defined between the first arm and the second arm, wherein the hinge comprises: a first rotatable member connected to the first arm; a first wedge fixedly connected to the first rotatable member; a second rotatable member connected to the second arm, wherein the first rotatable member and the second rotatable member define a rotation axis, wherein the first rotatable member and the second rotatable member are rotatable with respect to each other between the first angle and the second angle; an axel fixedly connected to the second rotatable member; a stopper slidably engaged with the axel, wherein the stopper comprises a second wedge; an adjustment member that is accessible to a user and operably connected to the stopper such that movement of the adjustment member relative to the stopper causes the stopper to translate along the axel, wherein the first wedge and the second wedge are configured to engage each other when the first arm and the second arm define the second angle; and at least one earpiece connected to the foldable headband.