US292387A - William thomas - Google Patents

Description

(No Model.)

W. THOMAS.

SPEAKING TUBE MOUTH-PIECE. :NO. Z92,387. Patented Jan. 22, 1884.

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UNITED STATES PATENT XVILLIAM THOMAS, OF PITTSTOX, PEXKSYLVAXIA.

SPEAKING-TUBE MOUTH=PIEC L SPECIFICATION forming part of Letters Patent No. 292,387, dated January 2?, 1884.

Application filed November 26, 1883.

I0 aZZ whom it may concern.-

Be it known that I, WILLIAM Trroinis, of Pittston, in the county of Luzerne and State of Pennsylvania,have invented a new and Improved Mouth-Piece for Speaking-Tubes, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved mouth-piece for speakingtubes, which mouth-piece is so constructed that the least current of air in the speakingtube will blow the whistle.

The invention consists in a cylindrical casing containing a swinging piece carrying a whistle, and having its outer end curved to fit well against the inner surface of the cylinder.

The invention also consists in a central shaft in the casing, which shaft is acted on by a spring, and has arms carrying the swinging piece.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a face view of my improved mouthpiece for speaking-tubes. Fig. 2 is a longitudinal sectional elevation of the same on the line m .r, Fig. 1. Fig. 3 is a plan view of the same, the top plate being removed. Fig. 4 is a rear view of the plate carrying the whistle.

At the front of a cylindrical casing, A, a funnel-shaped mouth or bell, B, is formed, and on the rear end of the casing a threaded neck, 0, is formed for screwing the mouthpiece to the end of the speaking-tube D. The casing A is provided with removable top and bottom pieces, E and F, respectively, in which top and bottom pieces a vertical spindle or shaft, G, is journaled, which is provided at its upper end with a crank-handle, H. A spring, J, having one end secured to the shaft G, is wound around the said shaft, and has its upper end secured on the under side of the top plate, E. Two arms, K, project from the shaft G, and on the outer ends of the said arms an upright piece, L, is held, which is provided with a central aperture, M, and has its outer surface rounded transversely to fit closely and snugly against the (No model.)

inner surface of the cylindrical casing A. A whistle, X, of the usual construction, is held over the aperture M on the innersurface of the piece L. Two cheek-studs, a and b, project from the upper surface of the bottom piece, F, against which studs the bottom arm, K, and the piece L can strike to limit the movements of the said piece L. The piece L is held loosely on the ends of the arms K, and thus prevents the curved surface of the piece L from working with too much friction against the inner surface of the casing, and if there is any lost motion between the piece L and the inner surface of the casing A, the pressure of the current of air in the tube can press the piece L against the inner surface of the casing A, thus preventing an escape of air, and causing the whistle to be sounded by the least current of air in the tube. The spring J holds the whistle N across the inner opening of the bell-mouth, and if the tube is to be used for speaking, the piece L, carrying the whistle, is swung to one side by means of the crank-handle H. The bottom of the casing is provided with an aperture, (Z, through which water that accumulates in the said casing can flow off.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A speaking-tube mouth-piece consisting of a cylindrical casing provided with a central shaft or spindle carrying a swinging piece, in which the whistle is fastened, substantially as herein shown and described.

2. In a speaking-tube mouthpiece, the combination, with a cylindrical casing, of a-central spindle provided with arms, a piece held loosely on the arms, and of a whistle held in the said piece, substantially as herein shown and described.

3. In a speaking-tube mouth-piece, the combination, with a cylindrical casing, of a swinging piece loosely secured to a central shaft, and carrying a whistle, which swin ing piece has its outer surface rounded to nt closely against the inner surface of the casing, sub stantially as herein shown and described.

4. In a speakingtube mouth-piece, the combination, with a cylindrical casing, A, of the LJI shaft or spindle G, jonrnalcd 1'11 the top and the Spring J the arms K on shaft G, and at bottom plates, and having arms K at right a-nright angles thereto, the whistle N, held in the IO glcs to it, the spring J, the piece L, held 011 piece L, and of thechcck-studs a I), substanthe arms, and the whistle N, held in the piece tially as herein shown and described.

5 L, substantially asherein shown and described. "WILLIAM THOMAS.

5. Ina speaking-tube 1n onth-piece, the coml Vv'il'nesscs:

bination, with the cylindrical casing A, of the P. FENN, shaft G, journaledin thetop andbottoni' plates, J. B. GORMAN.

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