US1439718A - Phonograph - Google Patents

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US1439718A
US1439718A US370521A US37052120A US1439718A US 1439718 A US1439718 A US 1439718A US 370521 A US370521 A US 370521A US 37052120 A US37052120 A US 37052120A US 1439718 A US1439718 A US 1439718A
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soundbox
diaphragm
stylus
record
lever
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US370521A
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William M Venable
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02Arrangements of heads
    • G11B3/10Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/34Driving or guiding during transducing operation
    • G11B3/36Automatic-feed mechanisms producing progressive transducing traverse across record carriers otherwise than by grooves, e.g. by lead-screw

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  • Fig. 1 is a plan view' of one embodiment of myinvention which can be used either with vertical or lateral cut records;
  • Fig. 2 is a side elevation of the apparatus illustrated in. Fig. 1;
  • Fig. 3 is a side view of a soundbox' embodying my invention; Fig.
  • Fig. 5 is a side elevation of a 'soundbox embodying a. modification of my invention
  • Fig 6 is an end view of the construction of in ull lines in the same figure.
  • Fig 5; Fig. 7 is across section through a soundbox illustrating the manner'in which the fulcrum support is insulated from the soundbox shell;
  • Fig. 8 is a plan view of a soundbox and, its carrier arm,the soundbox embodying my invention, illustrating the manner in which it can be applied for playing, records of either the vertical, lateral, or slanting types Without changing: the position of the soundbox;
  • Fig. 9 is a.65. side elevation of the construction illustrated in Fig. 8; and
  • Fig. 10 is a greatly enlarged section longitudinally of a record groove illustrating the manner in which aplaying stylus wears;
  • Fig. 11 is a cross section on a greatly enlarged scale through a portion of a record disc illustrating the character of the undulations in what is termed a slanting cut groove.
  • FIGs. 1 and 2 the invention is illustrated in association with a construction which is readily adaptable for playing either lateral cut or vertical cut records.
  • the swinging guide arm is represented by the tone arm 14' and its pivotal. support by 15'.
  • the soundbox 11' carried by the arm 12' is connected to the guide or tone arm by means of the vertical pivot 13'.
  • the supple mental arm 27 At this vertical pivot 13 there is fixed to the carrier arm 12' the supple mental arm 27 to the outer end of which is pivoted one end of the guide bar 7.
  • the other end of the guide bar is connected to a fixed support by means of the pivot 8".
  • Fig. 10 I have illustrated on a greatly enlarged scale, the point of a steel stylus which'has been much worn by proper use.
  • the bottom of the groove on the record 18 is represented by the line 28, and its upper edge-by the line 29.
  • the dotted line represents that portion of the stylus which has been completely worn awa This wear has pro: quizd a somewhate ongated sled-like bottom 31.
  • the sides of the needle have also been ground by the sides of the roove, as indicated at 32. This needle hasTi evenly worn through proper use upon a -mach1ne embodying my improvement and is especially serious to the delicate quality and large diameter,
  • Figs. 3 and 4 illustrate in held in place against een thus This is well known in the art B I y given phonograph users to play but one greater detail and on an enlarged scale a soundbox, which is especially designed for recording purposes.
  • the novel feature of construction is the provision of an elastic fulcrum for the vibration lever 34, consisting of a wire -33.'under tension and disposed in a plane substantially at right angles to the plane of the diaphragm, the lever being connected to the center' of the diaphragm 35.
  • the stylus 17 is firmly fixed to the vibration lever 34 preferably by means of a mixture of beeswax and resin.
  • the vibration lever is cemented or otherwise firmly attachedto' the wire.
  • the wire is supported by means of the yoke 36 attached to the shell of the soundbox 11.
  • the ends of the wire are bent over "a pair of clips 37 and attached thereto by means of small screws 38.
  • the clips are the arms 39 of the yoke by means of the screws 40 and 41 which screws also serve as a means for adjusting the tension on the wire 33 and also the pressure of the .vibrathe outer surfaees of tion lever upon the diaphragm at its center.
  • This matrix embraces both the wire and the Vibration lever and it is constructed to provide the usual thumb screw holding means 43 for the reproducing stylus 44.-
  • the rest of the device can'be made exactly the same or very similar to what has already been described in connection with the recording instrument illustrated in Figs. 3 and 4.
  • the yoke which supports the fulcrum wire is very rigid and, as the wire itself is incapable of appreciable stretchings under the influence of the small forces transmitted through the vibration lever, it is obvious that the lever' vibrations will produce slight bendings of the fulcrum wire, the elasticity of which always tends to bring the lever back into its neutral position.
  • Appropriate resistance in the wire is secured by making it of suitable length, thickness and composition and then by regulating its tension.
  • The. resistance may be increased or diminished by increasing or diminishingihe tension on the wire.
  • a reproducer constructed to embody this invention will eliminate, to a great extent, the harsh, metallic scratching sounds always present in greater or less degree in the playing of arecord. It will also cause less wear on the record because of the fact that it can yield slightly to compensate for any irregularities in the motion of the turn-table or in the surface of the record.
  • FIGs. 1 and 2 I have illustrate a construction embodyingmy invention in which. the soundbox can be so turned as to position its diaphragm in a plane transverse to one which istanoove.
  • This construction has been designe so that it can play either lateral or vertical cut records, the position of the soundboxwhen playing lateral cut records being indicated in dotted lines and osition when playing vertical cut recor s in full lines.
  • a v I In order to adapt my improved soundbox for this double or universal use, I- provide a used for p aying lateral cut records is removed when playmg vertical-cut. I haveso.
  • the fulcrum wire When-playing vertical cut records the fulcrum wire yields slightly to accommodate the stylus to lateral unevenness of motion due to inaccuracy in the rotation of the disc or other cause and when playing lateral cut records the wire fulcrum will yield slightly to accommodate the stylus to vertical unevenness of motion.
  • a phonograph sound box the combination with a diaphragm and its vibration lever, of a fulcrum for the lever including a plurality of wires substantially parallel with one another and with the axis of the diaphragm.
  • the combination with a diaphragm and its vibrationlever, of a fulcrum for the lever including a plurality of wiresv arranged in a plane which is substantially at right angles both to the plane of the vibrations of the lever and to the plane of the diaphragm.
  • the combination with a diaphragm and its vibration lever, of a fulcrum for the lever including a plurality of wires arranged in a plane substantially at right angles both to the plane of the vibrations of the lever and to the plane of the diaphragm and an attaching have a the diaphragm,
  • the com bination with a diaphragm and its vibration lever, of a fulcrum for the lever including two wires substantially equidistant from and parallel with the axis of the diaphragm for regulating the tension of the a fulcrum for the lever cushioned so as to permit of yielding bodily movement of translation and meanswhereby the amphtude of movement of translation may be varied.
  • a sound box a casing, a diaphragmv secured therein, a stylus, a lever connecting the stylus with ,the diaphragm, a spring associated with the. lever so as'to be bent by oscillations of the lever, means for regulating the tension of the spring, a fillcrum supporting memberfor the lever, and a cushion between the fulcrum supporting member and the casing which ermits limited vibratory motion between .t e supporting member and the casing.
  • a phonograph sound box the combination with a diaphragm and its vibration lever, of a fulcrum for the le'verincluding a. plurality of substantially parallel wires arranged ma plane which extends in a direction substantially at right angles to the plane of the diaphragm, said wires extending transversely of the diaphragm.
  • a phonograph sound box the combination with the diaphragm and the stylus of means for transmitting vibrations from thelatte'r to the former including a vibration lever, a stylus holder, atleast two yielding members both subject to deflection by the sound vibrations, and means for regulating the relative yield of the two members.
  • MIA vibratlon transmitting mechanism for a phonograph sound box comprising in combination with the stylus, the diaphragm, the stylus holder, least two yielding members cooperating with the foregoing parts, the yield of one being regulated by the yield of the other, and means for adjusting their .combined resistance to yield in order to vary the volume of the reproduced sound.

Description

Patented Dec. 26, 1922.
PHONOGRAPJH.
Application filed April 1, 1920.' Serial No. 370,521.
first to provide a simple means for maintaining the soundbox stylus in its correct position with respect to the record without abandoning the use of the'fixed pivotal support for the soundbox which has proven so 2 advantageous in practice as to have become almost universally applied: second, the pro-' vision of means which will permit the stylus to yield slightly in directions other than those normally demanded by the vibrations of the soundb'ox diaphragm: and third, the provision ofmeans embodying both of the foregoing which will conveniently adapt my invention for use in the reproduction of either lateral cut, vertical cut or slanting out records upon the same machine. An-
other obj-ect of the invention is the provision of a fulcrum support which is insulated from the soundbox' shell by means of some vibration absorbing material such as rubher. It is the further intention of this invention to-provide means which will accomplish the foregoin objects which can be readily applied to t e various types of phonographs already on the market with but little, ifany fitting or change. These, to-
gether with such other objects as are incident to my invention, or whichmay appear hereinafter, I obtain by means of a construction which I have illustrated in preferred form in the accompanying drawings, wherein:
Fig. 1 is a plan view' of one embodiment of myinvention which can be used either with vertical or lateral cut records; Fig. 2 is a side elevation of the apparatus illustrated in. Fig. 1; Fig. 3 is a side view of a soundbox' embodying my invention; Fig.
1 is a section on the line 44 of Fig. 3.
, Fig. 5 is a side elevation of a 'soundbox embodying a. modification of my invention; Fig 6 is an end view of the construction of in ull lines in the same figure.
Fig 5; Fig. 7 is across section through a soundbox illustrating the manner'in which the fulcrum support is insulated from the soundbox shell; Fig. 8 is a plan view of a soundbox and, its carrier arm,the soundbox embodying my invention, illustrating the manner in which it can be applied for playing, records of either the vertical, lateral, or slanting types Without changing: the position of the soundbox; Fig. 9 is a.65. side elevation of the construction illustrated in Fig. 8; and Fig. 10 is a greatly enlarged section longitudinally of a record groove illustrating the manner in which aplaying stylus wears; and Fig. 11 is a cross section on a greatly enlarged scale through a portion of a record disc illustrating the character of the undulations in what is termed a slanting cut groove.
In Figs. 1 and 2 the invention is illustrated in association with a construction which is readily adaptable for playing either lateral cut or vertical cut records.
In these figures, the swinging guide arm is represented by the tone arm 14' and its pivotal. support by 15'. The soundbox 11' carried by the arm 12' is connected to the guide or tone arm by means of the vertical pivot 13'. At this vertical pivot 13 there is fixed to the carrier arm 12' the supple mental arm 27 to the outer end of which is pivoted one end of the guide bar 7. The other end of the guide bar is connected to a fixed support by means of the pivot 8". By this simple construction the point of the stylus 17 can be maintained at all positions of the guide arm 14' in its correct position with respect to the groove in the record 18 in which it is traveling. To this end the proportion of the various parts are geometrically worked out and the-various points of pivotal support properly located. When the soundbox is placed upon the out- 'er edge of a record the parts will assume the positions indicated in dotted lines in .Fig. 1 .and when the record has been played the arts will assume the positions indicated As [the guide arm 14 swings inwardly toward the center of the recordthe soundbox carrier arm 12 will be moved in the opposite d1- ing, located at the outer end of the tone or 11 guide arm 14 in a manner well known in the art. The connections between the guide bar 7"and the vertical pivots 13' and 8' are made loose enough so as to permit the slight up and down movement 'of the soundbox which is required without danger of binding.
In talking .machines as hitherto made. there has been but one vertical pivot provided and that is the one at 15' around which the guide or tone arm 14 swings.
Consequently the stylus 44, as it moves inwardly over the surface of the record, makes a continually changing angle with respect to the groove in which it is traveling, the
total amount of variation ranging anywhere from 10 to 20.
The advantages secured by uniform and correct alignment of the stylus with reference tothe groove are very great. In Fig. 10 I have illustrated on a greatly enlarged scale, the point of a steel stylus which'has been much worn by proper use. The bottom of the groove on the record 18 is represented by the line 28, and its upper edge-by the line 29. The dotted line represents that portion of the stylus which has been completely worn awa This wear has pro: duced a somewhate ongated sled-like bottom 31. The sides of the needle have also been ground by the sides of the roove, as indicated at 32. This needle hasTi evenly worn through proper use upon a -mach1ne embodying my improvement and is especially serious to the delicate quality and large diameter,
it will be seen that as long as the pointremains fine enough it could be used repeatedly without detrimental effect to the record groove. Without changing the needle, after it has been used to play a record, the soundbox can be replaced inthe groove at-the be inning of the record and the needle'still t exactly, but if the machine does not provide the swinging movement of the soundbox carrier 12 a on the pivot 13 the worn edge of the needle from the end-of the record does not fit into the groove at the beginning of the record,.but sets diagonally across it. If an attempt is made to use the stylus twice it has to be worn in again when placed at the beginning the phonograph which are illustrated in the figures thus far considered and in greater detail -with' several modifications 'in igs: 3 to 9,. inclusive. Figs. 3 and 4 illustrate in held in place against een thus This is well known in the art B I y given phonograph users to play but one greater detail and on an enlarged scale a soundbox, which is especially designed for recording purposes. It will be seen that the novel feature of construction is the provision of an elastic fulcrum for the vibration lever 34, consisting of a wire -33.'under tension and disposed in a plane substantially at right angles to the plane of the diaphragm, the lever being connected to the center' of the diaphragm 35. The stylus 17 is firmly fixed to the vibration lever 34 preferably by means of a mixture of beeswax and resin. The vibration lever is cemented or otherwise firmly attachedto' the wire.
- The wire is supported by means of the yoke 36 attached to the shell of the soundbox 11. The ends of the wire are bent over "a pair of clips 37 and attached thereto by means of small screws 38. The clips are the arms 39 of the yoke by means of the screws 40 and 41 which screws also serve as a means for adjusting the tension on the wire 33 and also the pressure of the .vibrathe outer surfaees of tion lever upon the diaphragm at its center.
for it will be "observed, by means of the screws 40 and 41 it is possible to bodily move the fulcrum wire and all parts attached to it to a slight degree in one direction or the other longitudinally of the wire.
The above described construction pro-- vides a remarkably efiicient instrument which, in the particular form disclosed in Figs. 7 and 8, is particularly useful as a recorder This wire takes the place of the ordinary knife edge or other rigid fulcrum and is an improvement thereover. It can- 'not move appreciably in th'edirection of its length and; it cannot become worn loose or gummed up. It is very efiicient as aful crum for vibrations normal or at right angles to the diaphragm (those produced by sound waves acting upon the diaphragm), especially very slight ones and at the same time it will readily yield to .slight forces' normal to itself or in a plane .across its length (in general'forces which are longitudinal of the planeof the diaphragm) These forces or motions which I have termed normal to the wire, are -dueto wobbling of the turn-table or to variations or warpings of the surface of the record.
record maybe secured and maintained even though the turn-table and motor driving it be of comparatively crude construction such as is found in ordinary phonographs-not means of this slightly yielding contact I between the stylusfand the record a -very, uniform and at thesame time, a very slightpressure-of the stylus point; against {the intended primarily for recording purposes.
By properly adjusting the tension wire, it IS possible to raise the natural pitch ofthe system, as it might be termed,
in the" so as to render. it sensitive to high pitched notes but not sensitive to the raucous sounds WhlCll some soundboxes are prone to accentuate by resonance.
It is, of course, perfectly obvious that the principal of the wire fulcrum can be embodied in a soundbox which is intended for reproducing purposes only. Such an embodiment of my invention in a form which corresponds to the form shown in Figs. 3 and .4 is illustrated in the reproducer 11 shown in Figs. 1 and 2. The only difi'erence occurs in the provision of a suitable holding means for the reproducing stylus which will permit of its being changed whenever necessary. A very convenient manner in which to take care of this requirement is by the provision of a suitable matrix 42 which .is illustrated in Figs. 1 and'2 and also in Figs. 5, 6, 8 and 9, which latter figures illustrate modifications of the .invention to be described later. This matrix embraces both the wire and the Vibration lever and it is constructed to provide the usual thumb screw holding means 43 for the reproducing stylus 44.- The rest of the device can'be made exactly the same or very similar to what has already been described in connection with the recording instrument illustrated in Figs. 3 and 4. v
The yoke which supports the fulcrum wire is very rigid and, as the wire itself is incapable of appreciable stretchings under the influence of the small forces transmitted through the vibration lever, it is obvious that the lever' vibrations will produce slight bendings of the fulcrum wire, the elasticity of which always tends to bring the lever back into its neutral position. Appropriate resistance in the wire is secured by making it of suitable length, thickness and composition and then by regulating its tension.
These parts are so proportioned that the vibration caused by a faint sound, since it is of but slight amplitude, demands but a slight bending of the wire, and, therefore,
sufi'ei's very little resistance from it, while vibration caused by a loud sound encounters substantial resistance. The. resistance may be increased or diminished by increasing or diminishingihe tension on the wire.
A reproducer constructed to embody this invention will eliminate, to a great extent, the harsh, metallic scratching sounds always present in greater or less degree in the playing of arecord. It will also cause less wear on the record because of the fact that it can yield slightly to compensate for any irregularities in the motion of the turn-table or in the surface of the record.
Instead of using but a single fulcrum wire it is obvious that I may use two or more. Such a construction is illustrated in F igs; 5 and 6 wherein 'I show the use of two wires 33' and 33". The matrix, in this case,
plication of wires insofar as the reproduction of sound is concerned, and the saving of the record goes, is the same as it would be with one wire but the construction is more substantial and less likely to be injured, especially when changing the playing stylus. It is not necessary in all cases 'to provide a clip and adjusting screws at each end of the fulcrum wire or wires and in'these figures I have illustrated a soundbox for general purposes of a preferred construction in which there is but one clip 37 at one end. At the other end the two lengths of wire, which can be made continuous, loop over the arm'39 of the yoke 36 as shown. A thumb screw 41', adjustable by hand, is provided for regulating the tension on the wires, the particular value of which will appear hereinafter.
In the playing of records there is always present certain secondary or resonant viundesirable tone qualities which should be eliminatedor softened to as great an extent as is possible. My construction accomplishes this result to a degree heretofore unobtainable. When the stylus 44 is vibrated by the undulations of the record groove it 'must, as above stated, produce slight bendings in the wire or wires in transmitting such vibrations to the diaphragm. The re sistance of the wires tends to hold the stylus and its lever in neutral position and the tighter and stiffer they are the greater vWill be the resistance they offer. By regulating the tension it is possible to quite markedly regulate the quality of the reproduced sound. A wire under great tension accentuates' the vibrations. which produce the higher pitched sounds while one under a somewhat lesser tension will permit the tones of lower pitch to predominate.
In order to further avoid or nullify the effects of such secondary vibrations, I pro- In other soundboxes there is no such cushion between the fulcrum and the shell of the soundbox. Instead they areprovided with a rubber cushion between the soundbox ind its carrier arm, or betweeirthe soundbox and the tone arm, which, in my. construction, can
be readily dispensed with: Any mechanical vibrations, which may be communicated by the wire fulcrum to its support, are cush casing.
' provided.
shown in '7, it serves, in reproducers, in
addition to e fiunction of somewhat regulating the quality of tone, that of enabling me to vary the loudness'with whieh'a record is played without changing the stylus, or throttling the opening to the amplifierwhich are the two expedients hitherto employed,
and each possessed of certain objectionable features. To effect this regulation of tension the more readily, I make one or more of the adjusting screws av thumb screw 41' as shown in Figs. band 6. By turning this screw in'onedirection the wires 33 and 33 are tightened, and greater resistance is offered" by themto the vibrations, and consequently a portion of the energvof vibration is thereby communicated to the yoke 36 and absorbed by the rubber pads 47 and 48 (Fig. 7-) .to any noticeable degree. -The tone emitted by the reproducer is softened but not impaired in uality.. The loud sounds, especially, are re uced, while-the soft'tones are not lost. By loosening the tension, the vibration is freer, and the volume of sound increases. 1 1 This feature is especially valuable where "fsemi-permanent needles are usedin playmg, for, it Wlll be seen that the fulcrum, support'is' inca sense a floating one, capable of bodily-movement of translation. Its mass tends to resist vibrations and the pads 47 and 48 yieldingly hold theparts inplace. The amplitudeot movement. depends upon the resistance offered to the vibration ofithe are'relatively loose,
vibration lever. Thus, 1f the fulcrum wires relatively less resistance is offered to the vibrations of thelever; whereas if'the wires are relatively tight, the total resistance to be overcome is greater and the resistance of. the fulcrum support is overcome and-the latter. moves bodily under the vibrations of the "lever, the net result being that a-portio'n of the st lus vibration is absorbed or lostin the shi ing of the fiuless than that of the stylus,- correspond1ngly% By regulation of the tension of the wires, the amplitudeof vibration of the diaphragm gent-to the the at will, and the desired production obtained, and this without changing the needle.
7 My wire fulcrum tage of limiting the has the further advanmotion of the vibration lever with relation to the plane of-the diaphragm so that the diaphragm need not be used at all to support'the'lever, but may be merely cemented to it, with a suitable wax and without the use of ascrew or clamp as is frequently the case. The sole function of the connection in my construction is to transmit vibrations from lever to diaphragm, the lever beingecompletely supported. independently. Thus the connection to the diaphragm may be madelighter and more delicate, and the instrument is correspondingly more sensitive to feeble vibrations or to those of high pitch. In Figs. 5, 6 and 7-1 have illustrated-an embodiment of my invention suitable for playing records of the so called flateral type in which the undulations in the groove are from side to side horizontally of the record. This is well known in the art and need notbe described in detail. The playing stylus, in reproducing the sound waves of a record of this character, oscillates from side to side and it is, therefore, essential that the diaphragm of the sound-box be set in a plane which is substantially tangential to the groove in the record.
In contradistinction to this type of record there is a record which is lrnown'inthe art as the vertical cut, or hill'and dale record, in which the undulations which-produce the sound, arein an up and down direction verticallyof the record. The diaphragm of thesoundbox when playing a, record of this character must be located in a plane which is volume of tone re-,
substantially transverse to aplane which is" tangent to the record move; In Figs. 1 and 2 I have illustrate a construction embodyingmy invention in which. the soundbox can be so turned as to position its diaphragm in a plane transverse to one which istanoove. This construction has been designe so that it can play either lateral or vertical cut records, the position of the soundboxwhen playing lateral cut records being indicated in dotted lines and osition when playing vertical cut recor s in full lines. a v I In order to adapt my improved soundbox for this double or universal use, I- provide a used for p aying lateral cut records is removed when playmg vertical-cut. I haveso. des' ed-the soundbox carrier arm 12' and theswivel joint 49 thatvthe stylus, whether i it be playing a lateral'or a vertical cut recat relative to that of the stylus may be altered 0rd, comes at substantially the same point 1.20 swivel oint 49 m-the soundbox carrier arm which there is but one needle holder, the
swivel motion being of such a character as to bring the same needle point to the same position upon the record while varying the position of the diaphra m. When playing vertical cut records suc swivels bring the diaphragm into an inclined position. It isobvious that if, instead of maintaining the soundbox substantially vertical with respect to the disc andproviding the point 43', as
shown in Fig. 2, I use the needle 44 and in-' cline the soundbox to bring the needle to the proper point, I must make the fulcrum wire and its supports short enough to avoid touching the record surface. When I do this, my soundbox may' be used upon other universal tone arms, and for this purpose the use of adjusting screws at one end of the fulcrum wire only, as in Fig.6, is especially advantageous since it economizes space. My purpose, however, is not merely to produce a soundbox which may be used on other machines but comprehends making marked improvement in the phonograph as a whole; and it will be seen that these improvements all cooperate toward that end. Not only is the position of the parts shown in Fig. 2 most favorable for the perfect reproduction of sound, but there is the further advantage of having a permanent playing point for the finer hill and dale records such as the Edison. The changing of points used for such records is highly detrimental to the record.
groove.
When-playing vertical cut records the fulcrum wire yields slightly to accommodate the stylus to lateral unevenness of motion due to inaccuracy in the rotation of the disc or other cause and when playing lateral cut records the wire fulcrum will yield slightly to accommodate the stylus to vertical unevenness of motion.
have described myimproved soundbox with relation to the position of the diaphragm and stylus for playing either lateral or vertical cut records. There isfhowever, an intermediate type of record known as the slant or inclined cut. This type of record has grooves out in accordance with the diagrammatical illustration contained in Fig. 11 in'which the upper surface of the record is indicated by the character 50'a-nd the underface by the character 51.. The normal depth of the sound groove is indicated by the full line 52 and the undulations produced by the sound vibrations by the dotted lines 53 and 54.- These undulations are produced by means of a stylus acting in, the direction in:
dicated by the arrow 55. Such a record will play upon a machine in which the soundbox is set for pla ing either lateral or vertical cut records. y yielding fulcrum construction is particularly valuable when playing a record of this type upon an ordinary phonograph designed to play either lateral or vertical cut records. Under such circumstances there is a component in the undulations of the record groove which may be transmitted to the diaphragm to produce vibrations useful in sound reproduction and also a component which cannot be so utilized but which can, mstead, cause undue record wear or transmit mechanical vibrations through the fulcrumto the soundbox casing which are exceedingly undesirable and very marring in their influence upon the reproduced sound. Under these. circumstances, as above pointed out, my improved soundbox is exceptionally valuable, inasmuch as the yielding fulcrum and the sound vibration absorbing material between the fulcrumsupport and the soundbox casing tend to strain out or eliminate, to a great extent, the undesirable vibrations.
I can so design my machine and position the soundbox on its carrier arm as to make it possible to play any one of the three types of records which have been considered on the.
same machine without changing the position of the soundbox. I have illustrated the poproject in the same direction in which it would project were the soundbox to be set at the proper angle for either vertical or lateral cut records. My improved soundbox construction makes the showing of Figs. 8 and 9 a successful possibility, for without the yielding fulcrum which I provide such a position of the soundbox would cause excessive wear on the ordinary vertical or lateral cut records.
It should be noted that in the present application I make no specific claim to the guiding mechanism herein disclosed inasmuch as this subject matter has been claimed in a divisionalapplication filed August 12, 1921," bearing Serial No. 491,656.
What I claim is:
1. In a phonograph sound box, the combination with a diaphragm and its vibration lever, of a fulcrum for the lever including a plurality of wires substantially parallel with one another and with the axis of the diaphragm.
2. In a phonograph sound box, the combination with a diaphragm and its vibrationlever, of a fulcrum for the lever including a plurality of wiresv arranged in a plane which is substantially at right angles both to the plane of the vibrations of the lever and to the plane of the diaphragm.
- 3. In a phonograph sound box, the combination with a diaphragm and its vibration lever, of a fulcrum for the lever including a plurality of wires arranged in a plane substantially at right angles both to the plane of the vibrations of the lever and to the plane of the diaphragm and an attaching have a the diaphragm,
and means wires.
matrix for the lever having extended engagement with the wires.
4. In .a phonograph sound box, the combination with a diaphragm and its vibra tion lever, of a fulcrum for the lever ineluding two wires substantially equidistant from the parallel with the axis of the diaphragm, a stylus holder, and an attaching matrix for connecting the stylus holder to the wires.
5. In a phonograph sound box, the com bination with a diaphragm and its vibration lever, of a fulcrum for the lever including two wires substantially equidistant from and parallel with the axis of the diaphragm for regulating the tension of the a fulcrum for the lever cushioned so as to permit of yielding bodily movement of translation and meanswhereby the amphtude of movement of translation may be varied.
8. The combination with a phonograph sound box device, having-two vibrating members, .the diaphragm and the stylus, of a vibrating means for connecting the stylus to a support for said connecting means, a cushion between the support and the soundboxj adapted to permit bodily movement 'of translation on the part. of said support, and adjustable means for ofi'ering resistance to vibration' of the connecting the amplitude of vibrarelative to the stylus.- sound box, the combimeans so as to'vary 9.- 'In a phonograph I nation ot a stylus element actuating a diafbers each capa 7 phragm element; connecting means between said stylus and diaphragm, a cushioned support for said connectin means, and adjustable means for restraining the-action of the stylus upon the diaphragm through the medium of the cushioned support.
10. In a sound box, a casing, a diaphragmv secured therein, a stylus, a lever connecting the stylus with ,the diaphragm, a spring associated with the. lever so as'to be bent by oscillations of the lever, means for regulating the tension of the spring, a fillcrum supporting memberfor the lever, and a cushion between the fulcrum supporting member and the casing which ermits limited vibratory motion between .t e supporting member and the casing.
11. In a phonograph sound box, the combination with a diaphragm and its vibration lever, of a fulcrum for the le'verincluding a. plurality of substantially parallel wires arranged ma plane which extends in a direction substantially at right angles to the plane of the diaphragm, said wires extending transversely of the diaphragm.
. 12. In a phonograph sound box the combination with the diaphragm and the stylus of means for transmitting vibrations from thelatte'r to the former including a vibration lever, a stylus holder, atleast two yielding members both subject to deflection by the sound vibrations, and means for regulating the relative yield of the two members.
13. In 'a phonograph sound box the combination with the diaphragm and the stylus of means for transmitting vibrations from the latter-to the former'including a vibration lever, a st lus holder, at least two memle of yielding movement under vibratory forces, and means sustained only upon said transmitting mechanism for regulating the yielding of said members.
MIA vibratlon transmitting mechanism for a phonograph sound box comprising in combination with the stylus, the diaphragm, the stylus holder, least two yielding members cooperating with the foregoing parts, the yield of one being regulated by the yield of the other, and means for adjusting their .combined resistance to yield in order to vary the volume of the reproduced sound.
"In testimony whereof, I signed my name.
WILLIAM 'VENABLE.
and the vibration lever, atv
have hereunto
US370521A 1920-04-01 1920-04-01 Phonograph Expired - Lifetime US1439718A (en)

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