Appeal No. 1999-0414
Application No. 08/625,352
threshold that must be overcome in
order to rotate coupling member 8 or holder 6. They rotate freely when push-button
30 is pressed.
Alternatively, when push-button 30 of Mirmilshteyn is released, after the most
comfortable position for the ear cup is chosen, spring 29 engages the half-
couplings and the coupling member 8 is fixed relative to the headband 3 and holder
6 is fixed relative to coupling member 8. Thus, the operation of push-button 30
either releases elements for free rotation or engages elements to set fixed
positions. But, there is no disclosure or suggestion by Mirmilshteyn of adjusting
torque threshold levels so that application of a predetermined torque is necessary
to overcome a torque threshold value in order to cause rotation. Of course, one
might consider that enough torque applied to the headset components of
Mirmilshteyn even in the fixed position (push-button 30 released) would overcome
the resistance of the fixed position and so one could say that a threshold torque
value was exceeded. However, in that case, Mirmilshteyn’s headset would
probably be broken and unusable for its intended purpose. Similarly, one might
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