| 摘要 |
This device provides simplified, effective and inexpensive constructions for transferring energy stored in torque springs (30) to the function of keys, valves, rings and levers of musical instruments. It is a rigid tube indented with a longitudinal groove (12) designed to serve as an axle supporting key mechanisms between permanent posts anchored to the body of a musical instrument. After groove tube (10) is passed through forward post (18a), it is introduced into key tubing (14), groove (12) tracks over bump or protuberance (28) in key tubing (14) and groove tube (10) proceeds into back permanent post (18b) where it rests. Groove tube (10) is now journalled fore and aft in permanent posts (18a) and (18b). In like process, groove tube (10) fills the hollow of key rod (16) and is journalled in forward post (18a). The solid end of key rod (16) is pivoted at rear post (18b). This system permits lengthwise movement, but prevents rotation of groove tube (10) within key tubing (14) or key rod (16). The same groove (12) in groove tube (10) manifests itself as a ridge along the interior of groove tube (10). This elevation obstructs the rotation of hook (34) of torque spring (30).
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