Music – Instruments – Wind
Patent
1987-07-23
1988-07-19
Franklin, Lawrence R.
Music
Instruments
Wind
G10D 710
Patent
active
047577380
ABSTRACT:
A mechanism comprising a torsionally biased control rod having a valve cap which presses tightly against the valve opening found in the tubing of brass musical instruments. The control rod runs adjacent and parallel to the tubing of the instrument and may be adjusted to any length. The control rod's proximate end has a thinner diameter than its distal end. The proximate end of the control rod and passes through a ferrule which is affixed to the instrument tubing. The control rod's distal end is too wide to pass though the ferrule. A cap having a finger push pad is secured to the proximate section of control rod which extends from the ferrule. The cap diameter exceeds the ferrule diameter. The cap contains a spring which applies rotational bias to the control rod so that the valve cap normally presses against and seals the valve opening. When the push pad is depressed, however, the control rod rotates in a direction opposing its spring bias and the valve cap rises from the valve opening. When the finger pad is released the control rod rotates in the direction of its spring bias, and the valve cap returns to its original position as a seal to the valve opening.
REFERENCES:
patent: 885880 (1908-04-01), Stahl
patent: 1083620 (1914-01-01), Krause
patent: 1646059 (1927-10-01), Hebs et al.
patent: 3504590 (1970-04-01), Bedford
patent: 3782236 (1974-01-01), Shalek et al.
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