US249323A - Cornet - Google Patents

Description

(Model.) 2 sheets-sheet 1.

E. DUPONT.

CORNET.

Patented Nov. 8,1881.

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(Model.) 2 Sheets-Sheet 2.

- E. DUPONT.

CORNET. No. 249,323. Patented Nov. 8,1881.

UNITED STATES PATENT EEICE.

EUGENE DUPONT, OE CHICAGO, ILLINOIS, As'sIGNOE To A. L. E. VANDENA BEEGHEN AND EUGENIE VANDEN EEEGEEN, vBOTH OE WASHINGTON, D. O., AND MARY DUPONT AND oLAEIssE DUPONT, BOTH OE OIIIOAGO,

ILLINOIS.

` CORNET.

SPECIFICATION forming part of Letters Patent No. 249,323, dated November 8, 1881,

Application filed August 23, 1830. (Model.)

To all whom fit may concern:

Be it known that 1, EUGENE DUPONT, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Cornets; and I do hereby declare that the following is a full, clear, and eX- act description ofthe same.

My invention relates to certain improvements in the construction of cornets and other Io instruments of the Sax-horn class by Which- I am able to tune the valve-notes when the instrument is changed from one key to another, and also to an improved form of tuning-slide.

In the old form of cornet having valves of the Distin light valve, Bessonclear bore, or Courtois pattern, when the key of the instrument was changed by the vinsertion of an additional piece of tubing, technically called a crook,7 it was found necessary to draw the 2o slides for the valve-notes to a corresponding degree, in order that the valve-tones should be in perfect tune with the open tones of the scale, and although the slidcbends for the valvetones of the first and third valves were sufficientlylong to admit of tuning, the slide-bend for the middle or semi-tone valve-tone was so short that it could not be drawn sufficiently to bring that tone into tune with-the rest of the instrument. In the cornet described in Pat- 3@ tent 199,516, called a 4 four-in-one cornet,77 granted to Ine in connection with C. Gr. Conn, this difculty was obviated by the use of compensating-bends on each of the valves; but this device was open to objections on several 3 5 accounts: first, it required valves constructed specially for it andof a greater length than the ordinary Besson valves; second, it was very heavy and costly in the manufacture, and, third, as the total length of tubing used in 4o making a cornet is only about .95 ot' a meter, of which .45 of a meter is used for the bell, it was found that when the requisite amount had been used for the valves and their corresponding slides-namely, .35 of a meter-the .15 of a meter of tubing that remained was not sufficient to form a tuning-slide.

In my improved cornet these difficulties are overcome by using the ordinary valve-slides Aviews of my telescopic tuning-slide.

ofthe first and third valves for tuning them, and a short compensating-bend is added to the second or semi-lone valve. By this construction I get the salnefacilityin timing the valve as in the cornet above referred to, with these additional advantages: I ain enabled to use an ordinary Besson clear-bore, Courtois or Distin patent light valve, and while in the Conn s and Dupont patent .35 of a meter are required for the valves and their slides, in my improvement only .11 of a meter are used, leaving the remaining .24 of a meter in which I forni a telescopic tuning-slide.

For the purpose of more specifically describ ing my invention reference is made to the ac companying drawings, in which- Figure lis a side elevation ot' a cornet having my improvements. Fig. 2 is an elevation ofthe middle or semi tone valve, showing the compensating-slide. Fig. 3 is an elevation of the pump for the same. Figs. 4 and 5 show Vhen the valves are in their normal position open tones are produced when depressed, valve-tones.`

In the cornet represented in these drawings the wind-passage for the open tones is shown as passing from the mouth-piece branch to the third valve, A, through the connecting-tube 1, to the Valve B; from the valve B to the compensating bend b'; through this bend and back again to the valve B; from the valve B, through the connecting-pipe 2, to the valve C, and from that valve lto the bell branch or tube.

On the rear side ot' the valve B, and nearly opposite the valve-tone slide b, I x my compensating.- bend b'. (Shown more clearly in Fig. 2.) rEhis formsa part ofthe Wind-passage for the open tones when the valve B is in its normal or raised position. When, however, the valve B is depressed, the bend b is cut oi' and the wind passes through the valve-tone bend b instead. It is obvious that by this arrangement of the wind-passages the difference in tone produced by the depression of the valve B Will be effected by the substitution of alonger bend for a shorter one, and the precise amount of difference in the tone will be regulated by the amount of difference in length between the two bends.

The difference in length in an ordinary Eb cornet is .053 ot a meter, or the length of an ordinary semi-tone bend, when the cornet is changed to the key ot' G by the insertion of the C erook. Thisdiffereneemustbeincreased to .O65 of a meter, andthis increase is effected by drawing the valve-tone bend to the required distanee. The comparative lengths ot' these bends must be changed for every key. The valve-tone slides ot' the valves A and C are of suftieient length to allow ot' their being drawn sufe'iently to place them in tune with the rest of the instrument.

For the purpose of convenience in lowering the piteh of the instrument I have added a telescopic tuning slide, D, to the bell braneh ofthe instrument, (shown in detail in Fig. 5,) consisting of a pier-e of tubing, d, bent in the form ofthe letter U, and adapted to slide one end into the tubes E E, these, in their turn, sliding in the tubing' F, which forms the bell branch of the cornet.

In Fig. 4 I have shown a small telescopic slide, which may be used instead ot` the valvetone slide b whereadditionallength is required.

Having thus described my invention, what I elaim is- 1. The method of tuning the valves of a cornet or other windinstruments of that class by means ot' the usual tuning-slides on the first and third valves, a compensating bend and valve-slide on the semi-tone valve, and a tuning-slide on the main tubing, substantially as described.

2. The eombinationofthe valves, eaeh having its appropriate valve-slide, with the compensating-bend b on the middle valve and a tuning-slide on the main tubing of the instrument.

3. In aeornet,ateleseopictuning-slide made in two parts adapted to slide upon one another.

In testimony whereof' I have signed my name to this speeieation in the presence of two subscribing witnesses.

E UGENE D UPONT.

Witnesses:

HENRY D. FIELD, A. L. R. VANDEN BERGHEN.

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