US1441402A - Signal horn - Google Patents

Description

Fan. 9, 1923.

SIGNAL HORN. FILED-NOV. I7. 1919.

' 3,441,492 J. c. COULUMBE.

l atented Jan. 9, 1923.

JOSEPH C. GOULQIVIBE, 0F DRACUT, MASSACHUSETTS.

SIGNAL HORN.

Application filed November 17, 1919.

To all whom it may concern:

Be it known that I, Josnrn C. Counoiren,

a citizen of the United States, residing at Dracut, I county of Middlesex, Commonwealth of Massachusetts, have invented certain new and useful Improvements in Signal Horns, of which the following is a specification.

My present invention relates to certain pled with the factor or wear. My invention therefore contemplates a horn structure in whlch an extremely rapid vibratlon may be quickly set up and sustalned witha-mimmum of shock and wear to the mechanical parts. I

In carrying out my invention I employ an axial shaft, that is to say, a shaft lying in or substantially in the axis of the diaphragm. The objections to so disposing a shaft lays in the apparent conflict ofmultiple contact in the rotor and concentricity of diaphragm impact. I am able to accomplish the desired features of both axial alinement and central impact by a simple arrangement of contacting elements by which impacting vibration is multiplied. At the same time my invention lends itself to advantageous structure, efficient, symmetrical, economical and durable. Throughout the specification and drawings like referencenumerals are employed to indicate corresponding parts, and in the drawings:

Fig. I is a side view partly in section of a horn in accordance withiny invention.

Fig. II is a rear view of the horn cup.

Fig. III a fragmentary portion of the diaphragm showing the cam button stem opening.

Fig. IV a side elevation of front cam face and rear view respectively of the cam button, and Y Fig. V a front face and fragmentary side section of the rotary shaft head.

In the form of horn shown as illustrative of my invention I provide a body portion consisting of a motor casing 1 having bearing portions 2 and 3 on each side thereof in a Xial alinement with the armature shaft. This armature shaft is continued as the main rotor shaft 4t which finds hearings in 2 and Serial No. 338,468.

3 at 5 and 6 which are oiled at 7 One end of the shaft '4: is slightly concaved as at 4 Against this concavity rests aspherical follower 8 held in place by a spring 9 adjustable by a plug 10 screwed into the extension 2 and held by a lock nut 11 threaded on the plug. I

On the inner end of the shaft 4 is a rotor member 12 having cam teeth 13. Within a shell 15 mounted on the end of theportion is a diaphragm casing within which is a diaphragm 16. The diaphragm 16 is fitted at its center with a button 17 having cam teeth 18. The stem 19 is slightly flattened asi'ndicated at 19 Fig. IV, and fits through a similarly shaped opening 16 in the diaphragm 16, and also through a similar opening in a collared washer 20 A. spring 20 is disposed between this -collared washer and the shouldered head of' an. adjustable stem 21 which is threaded throughla reinforced yoke 22 which is set within the shell 15 of the diaphragm casingand projects slightly within thehorn member 24. which is also attached to that casingf Upon the rotation ofthe shaft 4 in the motor 1 the rotor head 12 through its following spring 9 works yieldingly against the button 17. The cam teeth of the rotor head and the buttoniare one of an odd numher and one ofan even number. In the form shown the rotor head has two cam teeth 13,

while the button has five of such teeth.

speed vibration giving the desired pit'chfto the horn.

It will be noted that the shaft 4 is dis posed axially of the diaphragm and symmetrically-on the central axis of the horn. This not only makes a very convenient and satisfactory structure, strong and pleasing in appearance but as in the form shown gives a very high efiiciency.

Through the relation of the odd and even numbers of the cam teeth it is possible with this central axial alinement to get the high vibration desired. The axial yielding of these alined members insures not only prompt engagement and release, but'also introduces a factor of great saving in wear. Various modifications may obviously be made in the type of horn as well as in the form of structure and arrangement of the several parts all such modification and variation may be made without departing from the spirit of my invention it within the limits of the appended claims.

What I therefore claim and desire to secure by Letters Patent is:

1. In a horn, a diaphragm, a rotor shaft in central axial alinement therewith, a spring pressed follower behind said shaft, and a spring pressed follower on the opposite sideof said diaphragm and alined with said shaft.

2. In horn, a diaphragm, a rotor shaft in central axial alinement therewith, an adj ustable spring )ressed follower behind said shaft, and an acjustable spring pressed follower on the opposite side of said diaphragm and aimed with said shaft.

3. In a warning signal, a diaphragm as-- ing having a sound-emission 'opening in a wall thereof, a horn having its inner end seated in said opening, and a perforated member disposed within said horn and adj istably clamping said horn in said position.

l; In a warning signal, a'casing having a sound-emission opening in a wall thereof, a perforated member set acrosssaid opening with its inner edge seated against the inner face of the casing Wall adjacent saidv opening, and means adjnstably clamping said member in said relation.

5. In a warning signal, a casing having a sound-emission opening in a wall thereof,

an outwardly disposed perforated member set across said opening with its inner edge seated against the inner face of the casing Wall acent said opening, and a spring-tensioned follower adjustably clamping said member in said relation.

6. In a warning signal, a diaphragm casing having a sound-emission opening in a wall thereof, a perforated member set across said opening with its inner edge seated interiorly of the casing wall adjacent said opening, a follower adjustable in said member, a diaphragm in said casing, and a spring interposed between said follower and the diaphragm for clamping said member in said relation. v

7. In a warning signal, a diaphragm casi'n'g having a sound-emission opening in a wall thereof, an outwardly bowed perforated member set across said opening with its inner edge seated interiorly of the casing wall adjacent said opening, said member having a bearing, a follower adjustable in said bearing, a diaphragm in said casing, a button on said diaphragm alined with said follower, and a spring interposed between said follower and the diaphragm button for clamping said member in said relation.

In testimony whereof I aflix my signatur in presence of two witnesses. V e

JOSEPH C. COULOMBE. IVitnesses DUDLEY E. CorLIss, VVILFRED M. Hnnn'nr.

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