US427720A

US427720A - Speaking-tube whistle

Info

Publication number: US427720A
Authority: US
Publication date: 1890-05-13
Anticipated expiration: 1907-05-13

Description

(No Model.)

J. P. WOLLENSAK.

SPEAKING TUBE WHISTLE.

No. 427,720. Patented May 13, 1890.

.0752? I WZZenJaZ UNITED STATES PATENT OFFICE.

JOHN F. VOLLENSAK, OF CHICAGO, ILLINOIS.

SPEAKING-TUBE WHISTLE.

SPECIFICATION forming part of Letters Patent No. 427,720, dated May 13, 1890.

Application filed December 80, 1889. Serial No. 835,414. (No model.)

To all whom, it 71mg concern.-

Be it known that 1, JOHN F. \VOLLENSAK, a citizen of the United States, residing at Ohicago, Illinois, have invented certain new and usefulImprovements'in Speaking-Tube Whistles, of which the following is a specification.

The object of my invention is to provide means to hold the piece containing the whistle in its proper central position, and prevent its being moved to one side or the other and my invention consists in the features and details of construction hereinafter described and claimed.

In the drawing, Figure l is a vertical section of a speaking-tube whistle, showing the whistle-piece turned back to open the tube, and Fig. 2 is a plan view of a section taken in the line 2 of Fig. 1, looking in the direction of the arrow and showing the whistle-piece down in its central or normal position.

Heretofore the whistle-piece in speakingtubes has been fastened to a rod extending through the tube and provided at the outer end with a small crank to enable a person to turn the whistle-piece back to open the end of the tube. This crank-rod has been provided with a spring whose tendency is to hold the whistle-piece in that position which closes the end of the tube. This spring by itself has not been able,however, to prevent lateral displacement of the whistle-piece and to hold it in a true central position, and it has therefore been liable to be moved toward one side or the other, as the crank-rod to which it is fastened is pulled or pushed in the one direction or the other. This movement to one side makes an opening at the side of the whistle-piece, through which the air can escape and fail to operate the whistle. This defeet has been a matter of annoyance and trouble in the practical operation of speaking-tube provided with whistles. In myimprovement I overcome this objection and positively secure the whistlc-piece in its normal central position, so that it will always cause the whistle to sound.

In making my improvement I take the ordinary shell or case A,whistle-piece l5, rod 0, and spring D, arranged in the usual way. I arrange a piece or connection E between the crank-rod and whistle-piece, provided with shoulders c, and solder the same to the rod and the whistle-piece. The shoulders c extend out far enough on either side to come into contact with the shell or case in which the whistle-piece is arranged. By thus contacting with the shell or case they prevent the rod from being moved or slid in the one direction or the other, and so operate to constantly hold it in its normal central position. This positive holding of the whistle-piece always insures the proper operation of the whistle when the tube is blown into, and evercomes the defect of lateral displacement, which, in the absence of means to hold the whistlepiecein its central position, often rendered the whistle inoperative and useless.

hat I regard as new, and desire to secure by Letters Patent, is-

In a speaking-tube, the combination of a shell or case, a whistle-piece arranged therein, a crank-rod for turning the whistlepiece, and a connection between the crank-rod and the whistle-piece, provided with shoulders abutting against the sides of the shell or case and holding the whistle-piece in its true central position against lateral displacement, substantially as described.

J OIIN F. WOLLENSAK. \Vitncsses:

Tnonns A. BANNING, 5A MUEL IIIBREN.