| 摘要 |
<p>PURPOSE:To increase the mechanical strength of the key base part of a lever to an external force and to improve the detachment and attachment operability of a key. CONSTITUTION:On the top surface of a blowing chamber formation member 12 which forms a blowing chamber 14 in a resonance cover 11, a key 22 is arranged so that the key is freely slidable in the up-down direction. A reed valve 28 opens and closes the valve hole B of the blowing chamber 14 associatively with the key 22. The lever 26 has its upper end coupled with the key 22 and its lower end part coupled with the back surface of the valve hole opposite surface of the reed valve 28. The key 22, lever 26, and reed valve 28 are molded integrally of synthetic resin. The lever 26 is sectioned almost in a channel shape which is open toward the base end side (fulcrum 24 side) of the key 22. The side wall of the coupling part between the lever 26 and key 22 is expanded toward the key base end side as it approaches the key 22. The side wall of the part of the lever 26 coupled with the back surface of the reed valve 28 is tapered toward the lower end of the lever 26.</p> |
