Headphone with a headband guiding mechanism
A headphone ( 1 ) comprising a first earphone ( 2 ) and a headband ( 3 ) to be arranged around the head of a user. The headband ( 3 ) comprises a first headband part ( 4 ) and a second headband part ( 5 ), that are telescopically connected, so that the length of the headband ( 3 ) can be adjusted in a longitudinal direction (Y). The first headband part ( 4 ) comprises an inner wall ( 9 ) with a protruding longitudinal first rib ( 8 ), which first rib ( 8 ) has a first rib sidewall ( 35 ) with a first rib protrusion ( 33 ) and a second opposite rib sidewall ( 36 ) with a second rib protrusion ( 34 ). The second headband part ( 5 ) comprises an outer wall ( 7 ) with a first longitudinal groove ( 6 ), which first groove ( 6 ) has first groove sidewall ( 20 ) with a first groove protrusion ( 22 ) and a second opposite groove sidewall ( 21 ) with a second groove protrusion ( 23 ). The first rib ( 8 ) is received in the first groove ( 6 ), and the first and second rib protrusions ( 33, 34 ) and the first and second groove protrusions ( 22, 23 ) defines small well-defined contact areas between the rib sidewalls ( 35, 36 ) and the groove sidewalls ( 20, 21 ).
1. A headphone comprising a first earphone and a headband to be arranged around the head of a user, wherein the headband comprises a first headband part and a second headband part, that are telescopically connected, so that the length of the headband can be adjusted in a longitudinal direction, wherein the first headband part comprises an inner wall with a protruding longitudinal first rib, which first rib has a first rib sidewall with a first rib protrusion and a second opposite rib sidewall with a second rib protrusion, and wherein the second headband part comprises an outer wall with a first longitudinal groove, which first groove has first groove sidewall with a first groove protrusion and a second opposite groove sidewall with a second groove protrusion, and wherein the first rib is received in the first groove, and wherein the first and second rib protrusions and the first and second groove protrusions, defines small well-defined contact areas between the rib sidewalls, and the groove sidewalls.
2. A headphone according to claim 1 , wherein the inner wall has a protruding longitudinal second rib, which second rib has a first rib sidewall with a first rib protrusion and a second opposite rib sidewall with a second rib protrusion, and wherein the outer wall has a second longitudinal groove with a first groove sidewall with a first groove protrusion and a second opposite groove sidewall with a second groove protrusion, and wherein the second rib is received in the second groove, wherein the first and second rib protrusions and the first and second groove protrusions defines small well-defined contact areas between the rib sidewalls and the groove sidewalls.
3. A headphone according to claim 2 , wherein the first groove and the second groove are provided on opposite sides of the second headband part.
4. A headphone according to claim 3 , wherein the second headband part comprises a bottom face facing the users head when the headphone is worn, a top face opposite the bottom face, and two side faces connecting the bottom face and the top face, wherein the first and second grooves are provided in the two side faces.
5. A headphone according to claim 4 , wherein the first headband part and a second end and a second end, wherein the second headband part is received in the first end, and wherein the first rib and the second rib has a first end part, which is located at the first end.
6. A headphone according to claim 5 , wherein the first and second grooves have a first end and where the first groove protrusion is arranged at first distance from the first end, and where the second protrusion is arranged at a second distance from the first end.
7. A headphone according to claim 6 , wherein a knob is arranged at the first end of the first and second ribs, which knob defines the first and second rib protrusions.
8. A headphone according to claim 7 , wherein a recession is provided in the second groove sidewall opposite the first groove protrusion, which recession is adapted to let the knob pass the first protrusion during initial assembly of the first headband part and the second headband part.
9. A headphone according to claim 8 , wherein the rib(s) and the sidewalls of the grooves are made of moulded plastics.
10. A headphone according to claim 9 , wherein the groove(s) and rib(s) are curved.