Music – Instruments – Wind
Patent
1983-11-18
1985-04-23
Franklin, Lawrence R.
Music
Instruments
Wind
84387R, 84396, G10D 900
Patent
active
045122334
ABSTRACT:
A pitch adjuster for a valved brass instrument having a tuning slide crook for selectively operating the tuning slide crook between a normal position, a preselected inward position, and a preselected outward position, to raise or lower the note played. The pitch adjuster comprises a main rod mounted to the tuning slide crook and slideably mounted in a ring to the instrument. Stops on the rod limit the inward and outward movement of the rod and tuning slide crook to predetermined positions, by engaging the ring. The outer end of a spring is engaged on the rod and the inner end is engaged by a collar which is held from inward motion from the normal position, so that the spring is compressed when the rod and crook move inward and exerts an outward restorative force on the rod only when the rod is in inward from a normal position. An auxiliary rod is mounted on the inward side of the collar, parallel to the main rod. The inward end of a second spring is engaged on the auxiliary rod and the outward end is engaged and held from outward movement by a ring which slideably receives the auxiliary rod, so that the second spring is compressed when the rod and crook move outward and exerts an inward restorative force on the rod only when the rod is in an outward from normal position. The separate apparatus for restoring the rod and tuning slide crook from an inward and from an outward position define a positive, stopped, normal position and prevent over travel of the rod and crook upon return to a normal position from either the outward or inward positions.
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