US1083045A - Sound-box arm for talking-machines. - Google Patents

Description

W. W. ZACKEY.

SOUND BOX ARM FOB TALKING MACHINES.

APPLICATION FILED-00112, 1912.

1,083,045. Patented Dec. 30, 1913;

mvsmon '1 W I WIQTNESSES tinrrnn s'rarns rarnnr ent ies.

WILLIAM W. ZACKEY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOROF FORTY-NINE QNE-HUNDREDTHS-TO CHARLES HEWITT, 0F BURLINGTON, NEW JERSEY.

SOUND-BOX ARM FOR TALKING-MACHINES.

Specification of'Letters Patent.

Patented Dec. 30, 1913.

Application filed October 12, 1912. Serial No. 725,447.

To all whom it may concern:

Be it known that 1, WILLIAM ZAoKEY,

a citizen of the United States, and residing talking machines and more particularly to the sound amplifying devices and has for an object to provide an amplifying arm and horn which are capable of transmitting and reproducing the sound with a minimum of variation from the original.

It has for a further object to provide a novel means of eliminating the scratching and scraping noises which are produced by movements of the sound arm .causedby vibrations of the sound record or irregularities in its surface. vised a construction wherein the amplifying armis maintained substantially in equilibrium, or floating condition, above the record but is so adjusted and arranged as to permit an extremely sensitive action of the needle with respect to the record.

It further consists of other novel features of construction all as will be hereinafter fully set forth.

For the purpose of illustrating my invention, I have shown in the accompanying drawings a preferred embodiment which is at present preferred by me, since the same has been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Figure 1 represents a sideelevation of a sound reproducing device, embodying my invention, the same being shown partly in section. Fig. 2 represents an enlarged section of a portion of the device. Fig. 3 represents a section on line m-ao, of Fig. 2. Fig. 4t represents aperspective of the supporting device for the sound arm. Fig. 5

To this end I have d8".

represents a section of a portion of the same. Fig. 6 represents a section of a portion of the sound arm showing its connection to the soundbox. Fig. 7 represents a section of a modified form of the device.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to "the drawings :-1 designates the sound horn or amplifying device by means of which the sound waves are trans mitted from, the reproducing mechanism and, in the present instance, this horn is sup ported on a cross bar 2, or the like, forming a part of the box or receptacle within which or upon which the mechanism is mounted.

3 designates the sound arm which carries on one end thereof a sound box 4; of any well known construction, carrying the customary needle 5, for contact with a record. In the present instance, I have-provided a horn tapering or flaring outwardly from the sound box 4., and in order to obtain the desired result in the quality and the volume of the" reproduction, I have preferred and have found in practice that an arm which is approximately elliptical in cross section is of the most desirable contour for the desired result.

Attention is directed to the configuration of the horn and arm since a cross section taken at any point in the length of these members will show two substantially parallel surfaces which are joined by curved side surfaces and this construction, as has been found, causes a variation in the sound waves tending to eliminate any scratching or metallic sounds not forming a component part of the reproduced sound.

It will be noted that the smaller end of the arm 3 is joined directly to the sound box 4., and therefore the sound waves are conducted substantially dircctly from the reproducing diaphragm to the interior of the arm 3, there being but a slight turn or bend as shown at 6, upon one portion of the arm.

This construction has the effect of mate L r rially reducing the reaction of the sound waves incident to a tortuous channel and the confusion of one sound wave with another is substantially eliminated.

In order to provide for the proper move ment of the arm 3 with respect to the record, I have devised aconstruction wherein the said arm-is substantially balanced or maintained in equilibrium so that any movement or movements which it may have due to irregularities in the record or otherwise are not reflected in the reproduced sounds in the form of scratchingv or scraping sound waves which mar or break. up the quality of the sound reproduced. In carrying out this embodiment of my invention, I have preferred to reversely bend or curve the sound arm 3, to form substantially a U- shaped portion and bring the delivery end thereof within the horn 1 in which position it'is supported upon a mechanism giving substantially the effect of auniversal joint. This mechanism embodies a knife edge 7, fixedly carried'by the arm 3 in any well known'manner and adapted normally to. seat within a beveled slot 8, formed in the head 9 of a stud 10. It will be noted, however, that the slot 8 preferably does not extend the full width of the head 9, so that a seat is formed which will revent side or lateral movement of the knife edge 7. The head 9 of the stud 10 is also cut away on one side to form an angular face 11, which gives suflicient clearance on that side to allow the arm 3 to swing on the knife edge 7, as a pivot, while swinging movement of the arm from one side to the other is permitted by mounting the stud 10 for rotation within a sleeve. 12, the latter being suitably fixed to the horn support 2. In order that .vertical adjustment -of the arm 3 may be made if desired, I preferably thread the stud 10 and employ a pair of nuts 13 located on opposite sides of the support 2, with respect to each other, and the action and operation will be readily apparent.

14 designates a lug or projection fixed to the arm 3, adjacent which and secured to the horn 1 is a spring catch 15, the latter being adapted at certain times to engage.

the lug 14, and thus lock the arm 3 in raised or inoperative position as shown in dotted lines, of Fig. 1-. -Attention' is particularly directed to the cross sectional configuration of both the arm 3 and horn 1, as thereby the "sound is conveyed continuously and without interruption from the time it leaves the sound box until discharged from the horn- .1, whereby the full sound quality is preserved and a substantially perfect reproduction thereof attained.

In Fig. 7 I have shown another form of pivotal connection for the arm 3 to the support 2, in which the head 9 of the stud 10 1s provided with a transverse annular channe 16 adapted to receive the pivot head 17 which is of the proper contour to permit the desired rocking movement. It will be noted that thepivotal support for the delivery end of the arm is located at such a .waves delivered from the sound box.

point that the vertical line passing therethrough will also pass through the center of gravity of the arm. a It will now be apparent that I have devised a complete unitary structure simple in construction and effective in operation for reproducing in a perfect manner the souncIlt will further be seen that, having once adjusted the arm 3 with respect to the record, there .will be substantially no tendency to distort the sound arm and whatever pressure'is transmitted from the record due to irregularities or the like, is at once taken up by the swing of the arm on its pivot.

Havin thus described my invention, what I c aim as new and desire to secure by Letters Patent, is: v

1. In a talking machine, the combination of a support, a tapered horn carried thereby, an amplifying arm having a reversely curved portion, a stud rotatably mounted in said support having a transverse channel therein, a pivot carried upon the under side of the upper terminal of said arm and seating in said channel, and a sound boxcarried by the lower terminal of said arm, said upper terminal extending a suitable distance within said horn and freely movable therein. 2. In a talking machine, the, combination of a support; an amplifying arm having a reversely curved portion, one terminal thereof being in a horizontal plane above the horizontal plane of the other terminal, a sound box carried by the lower terminal of said arm, a tapered horn stationarily supported and operatively positioned with respect to the upper terminal of said arm, and means carried by the said support and co acting with said arm at a point adjacent the upper terminal of said arm to movably support said arm, said point being located in a vertical line passing through the center of gravity of said arm, whereby said arm is movable and is balanced in operative position.

3. In a talking machine, the combination of a support, a tapered horn carried there-- by, an amplifying arm having a reversely curved portion, a stud rotatably mounted in 'said support having a transverse channel therein, a pivot carried upon the under side of the upper terminal of said arm and seat ing in said channel, the curve of said arm extending rearwardly of said pivot to form a counterbalance for the lower terminal of said arm, WhlCh extends forwardly of said pivot, and a sound box carried by the lower terminal of said arm, said upper terminal being situatedat a suitable point with respect to said horn and being freely movable with respect thereto.

4. In a talking machine, an amplifying device comprising a tubular arm having a pair of opposed flat side walls and opposed concave walls, said walls outwardly divergtaposed position forming a continuation ing, a sound box communicating with the thereof whereby thesound conduit is formed 10 end of said arm, and a horn su1tably su'pwithout corners and is uniform in cross secported having opposed flat walls and option throughout its extent.

posed concave walls, the. opposite end of WILLIAM W. ZACKEY. said arm being operatively' mounted with Witnesses: respect to said horn with the flat walls of ROBERT M. BARR,

7 each and the concave walls of each in 'jux- C. D, MoVAY.

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