US1197722A - Sound-modifier. - Google Patents

Description

N. C. DURAND.

SOUND MODIFSER.

APPLICATION FILED FEB. 10, 1913.

1,197,722. PatentedSept. 12,1916;

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NELSON C. DURAND, OF NEWARK, NEW'JERSEY, ASSIGNOB, BY MESNE ASSIGNMENTS, TOJ VEW JERSEY PATENT COMPANY, OF WEST ORANGE, NEW JERSEY, A CORPORA- TION OF NEW JERSEY.

SOUND-MODIFIER.

To all whom it may concern Be it known that I, NELSON C. DURAND, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in sound- Modifiers, of which the following 1s a description.

My invention relates to sound modifiers and more particularly to an improved sound modifier for use in connection with the'reproducers of phonographs, especially phonograp'iisemployed for commercial purposes.

Thc'principal object of my invention re sides in the provision of an improved, simple, and effective device of this character which may be economically and practically manufactured and which is so designed that by an easy manipulation the volume of sounds reproduced may be readily varied or regulated for securin" an adjustment to adapt the reproduction to the ears of any particular listener. k

Other objects of my invention will appear more fully in the following description and the appended claims.

In order that a clearer understanding of my invention may be had, attention is directed to the accompanying drawing forming a part of this specification in which the same reference characters are used'to designate corresponding parts throughout, and in which:

Figure 1 is a central sectional View of a phonograph reproducer and one form of my invention applied thereto; Fig. 2 is a side elevation of the sound modifier of Fig. 1;

is a side elevation showing in dotted lines a phonograph of the Edison commercial type with the deviceof Fig. 1 applied thereto and provided with a flexible ear tube.

Referring to'the drawings, reference character 1 represents a phonograph reproducer of conventional type in the sound box of usual diaphragm 2. Reference character 3 represents the rear wallof thesound box between which and the diaphragm 2 is formed a resonating chamber 4. The sound box is provided with the usual reproducer neck 5 which extends centrally from therear wall 3 thereof and the bore of which communicates with the reso-v nating chamber 4.-

Reference character 6 represents my ini- Specification of Letters Patent.

Fig. 3 is a bottom plan view thereof; Fig. 4

14 is then applied to tubular Patented Sept. 12, 1936.

Application filed February 10, 1913. Serial No. 747,291.

' proved sound modifier which, as shown,

comprises a tubular portion 7 having one or more longitudinal slots or kerfs 8 therein, a preferably reduced tubular portion 9, and a milled or knurled collar 10 intermediate the tubular portions 7 and 9' and preferably formed integrally therewith. The bore 11 of the tubular portion 7 is preferably of greater diameter than the bore 12 in the tubular portion 9 and these bores 11 and 12 are connected by a tapered passageway 13 preferably formed within that part of the modifier forming the collar 10 intermediate the tubular portions 7 and 9.

The outside diameter of tubular portion 7 of the sound modifier 6 is such that this portion will fit frictionally within the bore of thereproducer neck 5. The walls of tubular portion 7 are preferably quite thin and formed of resilient material, such as steel; and, if desired, this tubular portion 7 may be flared outwardly from the collar 10 to a very slight degree in order to increase the frictional resistance between the same and the bore of the reproducer neck when inserted in the latter. Collar 10 serves as a stop for limiting the extent to which the tubular portion 7 of the modifier may be in serted within the reproducer neck 5 as well as providing means whereby the position of the tubular portion 7 within the reproducer neck 5 may be manually adjusted or regulated. The flexible sound-conveying or ear tube 14 may be applied to the tubular por tion 9 of the sound modifier to convey the sounds fromthe reproducer to the ears of the listener.

It will be obvious that the volume of sound conveyed to the operator or other listener will depend largely on the position of the tubular portion 7 within the reproducer neck 5 and that this volume may readily be adjusted to suit any particular listenor by properly positioning the tubular' portion 7 withiirthe reproducer neck 5 to uncover more or less of the slots or kerfs-S and thus provide for less of the reproducedsou'nd waves to the atmosphere.

In operating the merely appl es the same to the reproducer 1 by inserting the tubular portion 7 thereof. into the reproducer neck 5. The ear tube portion 9 the volume of sound regulated to suit the device, the operator the escape of more or a ears of the operator by properly adjusting the position of tubular portion 7 Within the reproducer neck.

lVhile I have disclosed the nature of my invention by the illustration and description of but a single form, it will, of course, be understood. that the invention is not limited to'that form but may be embodied in numerous other forms without departing from the spirit and scope of the invention. I

Having now described my invention, what I claim and desire .to protect by Letters Patent is as follows:

' 1. The combination with a sound box provided with a resonating chamber and a neck extending therefrom, of a sound modifier comprising a member provided with a continuous sound conducting bore therethrough and having a tubular end portion which is connected with said neck for longitudinal adjustment with respect thereto and whereby said member is supported entirely from the sound box, the said tubular end portion being longitudinally slotted whereby more or less of the sound waves may pass directly to the atmosphere according to the position of said tubular end portion with respect to the neck of the sound box, substantially as described. p

2. The combination of a sound box having a diaphragm therein providing a chamber in the sound box on one side of the diaphragm and a sound box tube projecting from said chamber, of a sound modifier comprising an open ended tubular member, one end portion of which is adjustably connected with said sound box tube and is longitudinally slotted and the other'end portion of which is adapted to be connected with a sound conveyer, said tubular member being provided with unitary means intermediate its end portions for adjusting the same lon gitudinally with respect to the sound box and for engagement with the sound box tube to limit its movement in one direction, sub stantially as described.

3. The combination with a sound box and a sound conveyer, of asound modifier comprising a tubular member having a con-- tinuous open-ended bore and forming the sole means of connection between the adjacent ends of the sound box tube and the sound conveyer, the opposite end portions of said member being connected to said adjacent ends of the sound box tube and sound conveyer respectively, one of such end portions having a longitudinal slot, and said member being longitudinally adjustable with respect to the device with which the slotted end por cent ends of the sound box'tube and the round conveyer, the opposite end portions of said member being connected to said adjacent ends of the sound box tube and sound conveyer respectively, the end portion of said member connected to the sound box tube having a longitudinal slot, and said member being longitudinally adjustable I with respect to the sound box tube to uncover more or less of said slot while maintaining a fixed position with respect to said sound conveyer, substantially as described.

5. The combination of a sound box, a sound modifier comprising a tubular member' having a continuous open-ended bore and having one end portion thereof connected with the sound box, whereby the tubular member is entirely supported by said sound box, and a sound conveyerconnected with and supported by the other end portion of said tubular member, the end portion of said member connected with the sound box having a longitudinal slot and being adjustable longitudinally with respect to the sound box to uncover more or less of said slot, substantially as described.

This specification signed and witnessed this 7th day of February, 1913.

NELSON C. DURAND. Witnesses:

WVILLIAM A. HARDY, MARY J. -LAIDLAW.

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