Headphone joint
A headphone with a headband and at least one earcup. The at least one earcup is movably coupled to the headband by a joint that is structured to allow rotation of the earcup relative to the headband about two mutually perpendicular axes, and translation along one of these axes.
1. A headphone, comprising:
a headband;
an earcup; and
a joint that is constructed and arranged to movably couple the earcup to the headband, wherein the joint is structured to allow motions of the earcup relative to the headband, the motions comprising rotations of the earcup relative to the headband about two mutually perpendicular axes and translation of the earcup relative to the headband along one of these axes;
wherein the joint comprises a projection on one of the headband and the earcup, and a slot in the other of the headband and earcup, where the projection is at least in part received by the slot;
wherein the projection comprises a rounded portion frictionally engaged in the slot so as to constrain at least one of the motions of the earcup relative to the headband, wherein the rounded portion comprises a friction element around an outer surface of the rounded portion, wherein the friction element creates an interference fit with an inner wall of the slot.
2. The headphone of claim 1 , wherein the friction element comprises an o-ring.
3. The headphone of claim 1 , wherein the friction element is compressed against the inner wall of the slot.
4. The headphone of claim 1 , wherein the friction element is constructed and arranged to provide forces that resist translation of the earcup relative to the headband along a first axis, and rotation of the earcup relative to the headband about the first axis.
5. The headphone of claim 1 , wherein the rounded portion comprises a generally cylindrical member.
6. The headphone of claim 1 , wherein the rounded portion comprises a generally spherical body.
7. The headphone of claim 1 , wherein the projection further comprises a stem that is coupled to the earcup such that the stem is adapted to pivot relative to the earcup.
8. The headphone of claim 7 , wherein the stem is coupled to the earcup by a pin.
9. The headphone of claim 1 , wherein the rounded portion and the slot both have a diameter, and wherein the interference fit is at least in part accomplished by the diameter of the slot being less than the diameter of the rounded portion.
10. The headphone of claim 1 , wherein the slot is in a slider that is part of the headband.
11. The headphone of claim 10 , wherein the slider is curved.
12. The headphone of claim 10 , wherein the slider sits in a recess in the earcup.
13. The headphone of claim 12 , wherein the recess has sidewalls that are proximate to the slider, such that the recess sidewalls inhibit translational motion of the slider along one of the mutually perpendicular axes.
14. The headphone of claim 12 , wherein the recess comprises first and second surfaces that slope away from the projection.
15. The headphone of claim 14 , wherein the slider has a lower side that is arranged to contact the first and second sloped surfaces, to define end points of rotation of the slider about an axis.
16. The headphone of claim 10 , wherein the joint is structured such that rotation about one axis is constrained by the projection.
17. The headphone of claim 16 , wherein the projection further comprises a stem that passes through the slot, and the slot is wider than the stem and comprises end walls proximate the stem, wherein the stem can rotate relative to the slider, and end points of this rotation are established when either end wall contacts the stem.
18. The headphone of claim 1 , wherein the projection is on the earcup and the slot is in the headband.