US777505A - Sound-regulator for autopneumatic musical instruments. - Google Patents

Description

PATENTED DEC. 13

0. GELN'AY.

SOUND REGULATOR FOR AUTOPNEUMATIC MUSICAL INSTRUMENTS.

APPLICATION FILED APR. 5. 1904.

N0 MODEL UNITED STATES Patented December 13, 1904.

CHARLES GELNAY, OF NEWV YORK, N. Y.

SOUND-REGULATOR FOR AUTOPNEUMATIC MUSICAL INSTRUMENTS.

SPECIFICATION forming part of Letters Patent No. 777,505, dated December 13, 1904.

Original application filed February 26, 1904, Serial No. 195,347. Divided and this application filed April 5, 1904. Serial No.

To all whom it may concern:

Be it known that I, CHARLES GELNAY, a citizen of Austria-Hungary, residing at New York city, (Manhattan) county and State of New York, have invented new and useful Improvements in Sound -Regulators for Autopneumatic Musical Instruments, (which is a division of application filed February 26, 1904, under Serial No. 195,347,) of which the following is a specification.

This invention relates to improved means for regulating the volume of sound of an autopneumatic musical instrument so that the rendering of the music may be varied to conform to the taste of the player or to the requirements of the particular piece of music played.

In the accompanying drawings, Figure 1 is a longitudinal section, partly in elevation, of my improved sound regulating mechanism; and Fig. 2 is a cross-section on line 2 2, Fig. 1.

The letter 6 represents the exhaust-bellows of an autopneumatic musical instrument, the lower board I) of which is vibrated from crank-shaft Z2 by connecting-rod b. The upper board Z2 of bellows b is provided with an inlet-port 5", having valve 6, and with an outlet-port 6 having valve 6 The outlet-valve b discharges the exhausted air into the atmosphere and is guarded by an open cover 6. Above the inlet-port b there is mounted upon the board 6* a cell 0, which at c communicates with a pipe cl, connected to the vacuumchest 6, in which suction is to be produced. The chest 6 is operatively connected by flexible tubes (not shown) with the usual key-actuating mechanism. Upon the cell c is mounted a bellows f, which communicates at f with cell 0 and constitutes a receiver. The bellows f are normally distended by a spring f and communicate by a port f with a valve-box n, having an inlet-opening n. This opening is controlled by clack-valve 0, having outwardlyprojecting screw-stem 0. This (No model.)

p shaft 9. This shaft is by flexible shaft 9* connected to a shaft w hung in bearings T The shaft r is in turn connected by flexible shaft r with the spindle s of ahand-wheels. The spindle s rotates in bearings Z of a tubular guide Z, which is supported in the frame (1/ of the instrument. By turning hand-wheel s in one direction the coupling P will be lowered upon stem 0 to compress spring g. In this way the tension of valve 0 is increased to check the ingress of the air. If the hand-wheel s is turned in the opposite direction, the spring (1 will be relieved to take the tension more or less ofi valve 0 and correspondingly facilitate the ingress of air.

In use the suction-bellows b will upon expanding exhaust the air from chest 6 through pipe cl, port 0', cell 0, and port If. During this movement a suction will be created in receiver f, which will thus be partly collapsed. This suction will tend to open valve 0 against action of spring q to admit a small quantity of air into the receiver. Thus by adjusting the tension of valve 0 the quantity of air sucked in may be regulated to correspondingly regulate the vacuum in receiver f and the force of suction in chest a. In this way the suction operating upon the keys is regulated to correspondingly regulate the force of the key-stroke and the volume of sound emitted by the instrument. If the bellows b is collapsed, the air is exhausted through port 6 What I claim is 1. In an autopneumatic musical instrument, the combination of bellows with a receiver, an air-inlet valve having a threaded stem, a rotatable coupling having a nut engaging such stern, and with a spring engaging the coupthe shaft, andaspring engaging the coupling,

ling, substantially as specified. substantially as specified. IO

2. In an autopneuinatic musical instrument, I Signed by me at New York city, (Manhatthe combination of bellows with a receiver, an tan), New York, this 4th day of April, 1904. 5 air-inlet valve having a threaded stem, a ro- CHARLES GELNAY.

tatable coupling having a nut and a squared WVitnesses: opening, a squared shaft that slidably en- \VILLIAM SCHULZ,

gages the said opening, means for rotating FRANK v. BRIESEN.

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