Патент USA US2119218код для вставки
‘if 2,119,218 'Patented'May 31, 1938 ‘UNITED’ STATES‘- PATENT‘ "or-‘rice A * Stuart .1. Rodger, New main. Y.,-assignor to‘ . Jacob Strauss and Isidore H. Goldman, both- of I New'York, N. Y. Application December 24, 1937, Serial No.‘181‘,495 4 Claims. (01. 74-190) ~ - a ‘ . phonograph turntable drive~capab1e of operating . gether with vinstantaneous changeability from either speed to the‘ other. ' ‘ Another object of this invention is to devise such a phonograph turntable drive which drives In the art of sound recording and reproducing, two separate rims as disclosed in my copending This inventionrelates-to phonographs- and more ‘particularly '- to phonograph turntable drives. Stillmore particularly it-relates- to a 5 at two different speeds.‘ - from one rim on the turntable. rather than from 5 and especially in the ?eld of .so-called “instan- application Serial No. 1.22.170. ?led ‘January 25, i‘taneous” sound‘ recording‘ and reproducing, it is‘ 1937, thereby saving considerable expense in ma customary to employ two . different speeds or ro110 - tation of the turntable carrying the, record disk. Thus for records 12 inches 'or less in diameter a 'chinlng and construction and avoiding the neces sitlv for reversing the direction of rotation of the 10 electric moto’l‘llsed 85 a Source Of Power as the rotational speed of '78 PR. P.M. is commonly em- change in speed is effected. ‘ " , Ployed. For records greater than 12 inches. in ' Another ‘Object of this invention‘ is to'accom diameter '_a speed of 33% R. P. M. is used. It. is plish the foregoing objects :WhiIe'Hsine. friction‘ I 15 customary in the art'to use the same equipment idlers to transmit the driving power fromthe 15 . ‘for recording and, reproducing sound at both of‘ shaft of the electric motor used to the driving i ‘_ these speeds; in order-to minimize overhead and rim of..the_-turnteb1e- Use of friction drive and investment and for- convenience, of idlers reduces vibration and variations ‘in speed ' } i - _ It is necessary that the turntablebe capable of to. a marked extent and is deemed necessary in 20 being rotated at exactly-313M301; 7a 13,; P, iorder to obtain goodrecording and reproduction. gm ' since these speeds .have become standard in the ,My invention Drcvides a turntable drive capable _ . art. ‘It is highly desirable that the design of the of driving the turntable at either of two desired .. equipment- used be such that the change in ro- , speeds at will, while at the same‘ time utilizing V - tational speed of the turntable from eithef of friction drive and friction idlers between the driv 25 these speeds to the other be convenient and rapid.‘ ing shaft. and the driven rim of the turntable. It is also desirable that it be e?ected without Referring to the accompanyingdrawing .which ‘disassembly of any parts or without removal of portrays my invention in its preferred embodi-" v the turntable. In addition, the vdrive for ' the ment: ' - ‘ . ' . - turntable.-must be quiet and free from vibration ' Figure 1_ isjavertical sectional view along the 30 which would affect adversely-the quality of the line‘ l_——l of Figure 2. ' ' ‘Figure :2 is a horizontal plan view partly in 30 recording or the reproduction. Moreover the vdesig? of the drive must be such that'long-life of ' section. _ v Figure 3 is‘ a vertical sectional view along the I allnioving parts is obtained. ' ' _ . . Various expedients for obtaining theydesired, line 3—3--of Figure 2. _ > ' '35-’ change in speed of the turntable have been here'- . ‘The two speed turntable drive contemplated 35. by this invention utilizes an electric motor the ~ tofore suggested but so far.‘ as I am ‘aware, none. . of them has been entirely‘ vsuccessful. Many of“ shaft of which projects vertically upward below‘ them involve gearing and undue complication to-' the turntable. The turntable is provided with a one downwardly‘ extending driving rim which is ‘ gether with noisy anduncertain operation and 'most-‘conveniently located at the outer» edge of 40 4'0 short life. ' Many cause: excessive vibration‘ of the turntable . with consequent detrimental effect .theturntable. The portion ofthe motor shaft upon‘the recording or-r'e'production. Others in-», which extends or projects above thelowerv edge of > volve removal of the turntable in order to ‘effect ’ this driving rim is'so constructed asito have two the change in speed. Thislis objectionable be- portionsof different diameter, which are so cal cause of the length‘ of time required, because of _ culated‘in ‘relation to the diameter of the tum- 45. . ‘45 the ‘inconvenience incurred and because of the resulting wear on the parts. ~ ‘ Y . . 4 . table driving rim that when this driving vrimis .driven from the smaller portion/of the motor " The principal object of this‘ invention is to ‘ devlseaphonograph- tumtable' drive which 'o'ver-. comes the foregoing disadvantages and which at'50 ‘tains many new advantages not heretofore <at-~" - tained in this art. - ‘ ' ' - shaft it turns at, a speed of 33%» R. P. M. and. that when the driving rim is driven from the larger portion ‘ofpthe motor shaft, .it turns 'at a 50 speed of. '18 R. P.‘ M.. In placeoi' ‘the speci?c a. - speeds mentioned, speeds approximating thereto ' ‘ ' 'Another' object of this invention isto devise may be used. Thus in the device contemplated - =a phonograph turntable drive with which vibra- - by .this invention, I prefer to so calculate the tio?-free anduniform operation is attained; to- sizes of the parts that speeds-slightly in excess 16 2 2,119,218 of these standard speeds would theoretically ob jecting solid edge portion 9. The driving rim 8' tain so as to compensate for the slight slippage may be formed in any desired manner and may be machined in the turntable or may be formed encountered in practice. The driving force of the motor is transmitted from the extending portion of the motor shaft described to the turntable driving rim by means of two rubber friction idlers disposed in a plane parallel to the turntable. These idlers are lo represents a motor which is of any suitable type and is ?exibly mounted on metal plate Ii by cated between the motor shaft and the driving means of rubber mountings I2 and I3 which are of any ordinary type which permit the motor to ?oat and which absorb its vibration to a con siderable extent. The plate II upon which the motor I0 is mounted is pivoted at one end by means of pivot I4 which allows the outer end I5 of plate I I to move circumferentially in either 15 of the directions indicated by arrows I 6 and 10 rim. One of these idlers is so disposed that up on moving the motor shaft in the proper direc tion the idler is driven by the smaller por tion of the motor shaft and drives the turntable at the lower speed, namely 331/3 R. P. M., by con 16 tact with the driving rim. The other of these idlers is so disposed that upon moving the motor shaft in the opposite direction the idler is-driven by the larger portion of the motorshaft and drives the turntable at the higher speed, namely 20 78 R P. M., by contact with thedrivirig rim. 30 40 45 60 separately and rigidly attached to the turntable by any suitable means. Describing now the turntable drive itself, I0 I1. Motor mounting plate II is preferably lo cated above the panel I8 which serves to hover the mechanism and as a support mounting the various parts as shown in the drawing. Thus 20 The motor shaft is movable in a direction sub~ . pivot I4 for the motor mounting plate II is pref stantially perpendicular to a radius of the turn erably rigidly attached to the panel LI8, as shown. table. This movement is effected by mounting At the outer end of motor mounting plate I I is lo the motor on a movable lever which is pivoted cated an upwardly projecting threaded member to the panel under the turntable. The motor is I9 which projects through panel I8. At the end 25 capable of being placed in a neutral position in .of this threaded member I9 is a knurled knob 20 which it touches neither idler. It is also ca provided internally with threads which ?t the pable of being moved in either direction from cooperating threads of member I9. Thus when this neutral position so as to cause the larger knob 20 is screwed down it locks plate II in the portion of its shaft to contact the idler for the position in which it then is. When knob 20 is 30 higher speed or so as to cause the smaller por loose it is used to push plate II backwards and tion of its shaft to contact the other idler for the forwards by means of member I9, thus causing lower speed. the motor I0 to move backwards and. forwards. The idlers used are preferably rubber rimmed Member I9 moves through a slot 2| the ends metal wheels which construction gives high fric of which 22 and 23 act as stops to limit the 35 tional driving power with very little vibration movement thereof and therefore the movement or ?uctuation in speed. The idlers used are rela of plate II and of motor I0. tively large in diameter compared to the motor As the plate II is moved in either direction shaft (either the larger or the smaller section). away from the middle neutral position, it carries This allows the motor shaft to make good fric the motor I0 and consequently the motor shaft 40 tional engagement with the idler. The idlers ‘indicated generally as 24 with it in the same are relatively small compared to the size of the direction.‘ The motor shaft 24 is therefore turntable driving rim. This allows very good moved in a direction substantially perpendicular contact with the turntable rim. to a radius of the turntable. In the neutral po The idlers drive the turntable at either speed sition of the parts in which position the parts 45 from the inside of the ‘turntable rim. This al are shown in the drawing, the motor shaft 24 lows a greater area of contact between the idler is in a neutral position in the middle of the path and the rim than if either of them were to drive of its travel. . against a rim which was convex as to it._ Thus Motor shaft 24 projects upwardly beneath the greater torque and a more even speed is made turntable I as shown. The portion of the motor 50 possible‘ than in the construction where one idler shaft 24 which projects upwardly beyond the drives a rim which is convex as to its, asin my lower edge 'of the driving rim 8 of the turntable _copending application Serial No. 122,170 above identi?ed. ~ is machined or otherwise constructed so as to form a larger portion 25 and a smaller por Describing now the embodiment shown in the tion 26. This construction may be attained by drawing: I represents a rotatable circular turn tightly ?tting sleeves which are tightly ?tted table the top portion of which is in the usual onto the motor shaft 24, as indicated in the draw form, with a projecting pin 2 in its center to ing, or it may be attained by machining down accommodate the record. Downwardly pro the projecting portion of motor shaft 24, where 60 jecting shaft 3 of the turntable is of substantial diameter, say 1,41 .to 1 inch, and rests in the this shaft is of su?icient size to enable this to turntable bearing 4 which is of any suitable type be done. As the motor shaft 24 is moved in the and may comprise a closely ?tting sleeve portion ‘direction corresponding to movement of plate II in the direction of arrow II, it drives the tum 5 and a steel ball Ii located in the rounded bot7 table at the higher speed (78 R. P. M.) by means 65 tom portion ‘I of the turntable bearing. ‘of rubber friction idler 21 which the larger por The turntable I is of metal such as cast alu minum and is formed or machined on its under tion 25 of the motor shaft 24 frictionally en gages. Idler 21 then drives the turntable by - side so that a driving rim 8 adapted to be driven frictional engagement with the turntable driv by frictional engagement is formed. The diam 70 eter of this driving rim is variable within wide ing rim 8. limits, and will depend largely upon the size of As the motor shaft 24 is moved in the direction the turntable, it being usually most convenient corresponding to movement of plate II in the to have it near the edge of the turntable I as direction of arrow I6, it drives the turntable I shown in the drawing wherein the drivingv rim at the lower speed (33%; R. P. M.) by means of 75 8 islthe inner circular edge of downwardly PI'QF" rubber friction idler 28 which frictionally engages -55 55 60 70 75. ' ‘2,119,218 ‘ .‘ ~ 3 the smaller portion 26 of the motor shaft. .' Idler 28 then drives the turntable l by frictional-en II by means'of knob 20' whereupon knob 20 is. tightened to lock the plate II and ‘the motor in‘ either‘ idler, the point where the driving‘portion is now rotating contacts the vrim 8 of the turn table causing it to rotate at the higherv speed (78 position. As the'motor is moved in this direction gagemen‘t with the turntable driving rim 8. . The parts, namely, idlers 21 and 28, motor shaft ' the larger portion 25v of the projecting portion of ‘ , 5 24 together withgit's larger and smaller portions, vthe motor shaft 24 contacts idler 21 which begins 5 _ 25 and 28, respectively, are so arranged that to‘ rotate. As the motor is continued in its move-' fwhen. the motor is in the driving position for , ment until pin l9 touches stop 23, idler 21 which 25 or 28 of the motor shaft 24 contacts the rubber l0 ‘\‘idler 21 or 28, the point wherethe idler 21 or 28“ R. P. M.) in the direction indicated by the arrow 10 w 38 in Fig.‘ 2., When it is desired to- cause the turntable at the other and lower speed the motor .circle representing- the periphery of the idler 21 ‘is moved. in the other direction until pin l8 touches stop 22 and the motor drives the tum ‘or 28 are allv substantially 120° apart. This. con '15 struction is not vital ‘to theoperation of the tabl'e through the‘ smaller portion 26 of the pro- 15 .jecting motor shaft and idler 28-. ,_ ‘ Y , devicebut results in the most e?lcient trans When the apparatus is not in use, the speed mission of the driving‘force from the motor shaft . . 24 to the turntable rim 8 at either of the two control ‘knob 20- is moved to the center position, freeing the idlers from the turntable rim 8 and speeds.‘ ’ ‘ contacts the turntable driving rim 8 and the point > where the axis of the idler support intersects the 20 Idlers 21 ‘and 28 are not located in vthe Isame the driving portions of the, motor shaft, relieving 120 , ‘ horizontal plane‘. ‘Idler' .28 which contacts the . the‘pressure and lengtheningtheir life. ~' As will be obvious the projecting portion of the . ' upper and smaller driving portion 28 of the motor motor shaft 24 is machined to the proper sizes so ‘ shaft is ‘located in a plane above the‘plane of that the desired speeds are obtained. idler 21- which contacts the lower- and larger driv 25 in? portion of the motor shaft. ‘ ‘ ,The idlers 21 and 28 are metal wheels having relatively thick rubber rims 29 and 38 respec~ tively, although they may be of any other con .- struction provided they are adapted to frictionally 'of rotation of the motor shaft 24. Thus ‘when using a motor having a speed of 1750 R. P. M., and a driving rim having a diameter of ~16 inches, the smaller part 28 of the motor shaft is made 0.310 .30 30 transmit the torque of the motor to the turntable in a satisfactory manner and are of such mate rials as to have desirable long wearing qualities. These sizes ’ are calculated with reference to the diameter of 25". ._ ,the driving rim 8 and with‘reference to the speed- - .inch in diameter and the larger‘ part 25 is made . 0.730 inch in'diameter.‘ These sizes cause the turntable to rotate atspeeds of 33.6 .RhP. M. and ‘ The use of these friction idlers isjhighly desirable since they I‘ act' as ?lters, absorbing whatever -80' R. P._wM.,-respectively.' These increases over , standard‘ speeds of 78R. P. M. and 33% R. P; M. 35 - .35, minute vibrations are set up by the motor before they reach the turntable. Idlers 21 and 28 are have been found sufficient to allow‘ for the slight ‘driven by straightline engagement‘with the drive ' loss in speed due to slippage. The advantages of this drive are numerous. 'One advantage is that change‘in speed is‘ se cured instantlyby moving a lever, it being un- 40 ing portions of motor shaft '24 ‘and drive the ' turntable i by straight lineengagement with the 40 driving rim 8 of the turntable l. - ‘ ' The idlers 21 and 28 are mounted so as to rotate about bearings 3| and 32 at their center. . Bear necessary to remove the turntable or anyidlers , '.to effect the change in speed. ings 3| and 32 are preferably self-oiling bearings which prevents oil, getting on the idler friction 45 surfaces and_.ruiningthem; by disintegrating the rubber or by destroying the frictional! engage me'nt between the idler surface and the rim or the motor shaft.‘ . ‘ ‘ I a ' Idlers 21 and 28 are supported in .such a man Another ad vantage-is that by having a neutral position in ‘ which the idlers are not under pressure, the life of‘ the idlers is increased considerably. Also be- 45 cause it is not necessary to, remove the idlers to ‘ ' change the speeds, an‘automatic' self-oiling bear ing can be used on them. This prevents oil getting on the idlers and‘ruining them. By hav 50 ner that they may move outwardly so as to engage ‘ing suitable'stops to limit the motor movement,‘ 50 . the driving rim 8. v This is accomplished by means > the correct pressure on the idlers is assured. The’ vof ?at supporting members 33 and 34, respec “ t1vely,which are pivoted so as to be movable about ?xedpivots 35 and 38, respectively. Idler 28 is turntable is readily removable from the machine by simply pulling it upward, whichv gives free access to any. of the working parts. Siricethe turntable is driven at both speeds on its outer '55 ' ,55 so mounted as to rotate about pin 38 by means of ~rim a greater torque is developed .at both speeds its own bearing surface 82 and pin 38 is integrally fastened to supporting member 34. Idler. 21 is so . than'is-the' case where’ the turntable is.driven onespeed by a driving-rim which is smallin -mounted as to rotate about pin -31 by means of-its at own bearing surface 3| and pin 81 is integrally diameter as in my copending application Serial No. 122,170, above identified. In‘the device 0011- 69 ‘no fastened to supporting member 83. " templated by this invention the turntable is ‘ _ Idler supporting member's Y33 and 34 are mov driven at either speed by means of an idler which able about, ?xed pivots '85 and", repectivel'y, which are preferably‘ integrally attached to main panel l8, as shown. I The construction shown en 65 ables theidlers to ?oat freely and to absorb vibra tion to the fullest extent. 7 . , ‘ - The mode of operation of the device will be . obvious from the foregoing description. How ' ever, it may be'descr'ibed in ‘detail as followsi 70 , The motor I8 is in its neutral position as shown in the drawing. It is started by sending an elec ,tric current through it. After it‘has. come up to speed it is moved in a direction corresponding to movement of plate I I in the direction of arrow I1. contacts a driving rim which is concave relative ' to it,v This gives better frictional transmission tothe turntable driving rim than is the case in 65' -my application Serial No.~122,170 wherein the ' drive at the higher speed is'by means of a driv ingirim which is. convex relative to the surface of.‘ the driving idler. Another advantage of this in vention is that the device contemplated thereby 70 ' ' makes it unnecessary to reverse the direction of _ the‘ motor as it is moved from driving engage ment at one speed to driving engagement at the other speed.‘ The elimination of this reversing 75 This movement is accomplished by moving plate. switch makes for sim'plicity'of construction and 17s ' 4 2,119,218 operation and lessens the cost of construction. capable of operating at either a lower or a higher Also it makes possible a more rapid change of speed as it is not necessary to let the motor come to a stop before changing to the other speed. While generally it will be desirable to operate the machine with the turntable in the horizontal plane, ‘as shown in the drawing, it will be appre speed comprising, in combination, a rotatable circular turntable having a downwardly extend ing circular driving rim, an electric motor so located that its shaft projects upwardly above .the lower edge of said driving rim, the projecting ciated that if desirable it may be operated with the turntable in a vertical plane. The principle a larger circular driving portion, a lowerspeed friction idler located between the smaller por if) of my invention is applicable regardless of the plane in which the turntable is located. _ Having described my invention, what I claim is: 1. A two-speed phonograph turntable drive capable of operating at either a lower or a higher speed comprising, in combination, a rotatable circular turntable having a downwardly extend ing circular driving rim, an electric motor so lo cated that its shaft projects upwardly above the portion of said motor shaft having a smaller and tion of said'motor shaft and said driving rim, 10v a higher speed friction idler located between the larger portion'of said motor shaft and said driving rim, said idlers being so supported that they are free to move outwardly to contact said driving rim, said motor shaft being movable in 15 either direction along a line substantially per-' pendicular to_a radius of the turntable and be ing so located that as it is moved in one direc lower edge of said driving rim, the projecting tion, its smaller portion drives the turntable at the lower speed through said lower speed idler portion of said motor shaft having a smaller and a larger circular driving portion, a lower speed friction idler located between the-smaller por tion of said motor shaft and said driving rim, a the other direction its larger portion drives the turntable at the higher speed through said high er speed idler and said driving rim. higher speed friction idler located between the larger portion of said motor shaft and said driving rim, said motor shaft being movable in capable of operating at either a lower or a higher speed, comprising in combination, a rotatable and said driving rim and that as it is moved in 4. A two-speed phonograph turntable drive 25 a plane parallel to the turntable in such manner . circular turntable having a downwardly extend ing circular driving rim, an electric motor so lo that its smaller portion may drive the turntable at the lower speed through said lower speed idler and said driving rim and that its larger portion may drive the‘ turntable at the higher speed through said higher speed idler and said driving rim. cated that its shaft projects upwardly above the 30 lower edge of said driving rim, the projecting portion of said motor shaft having a ‘smaller and a larger circular driving portion, a lower speed friction idler located between the smaller 2. A two-speed phonograph turntable drive portion of ‘said motor shaft and said driving rim, 35 capable of operating at either a lower or a higher speed comprising, in combination, a rotatable circular turntable having a downwardly extend ing circular driving rim, an electric motor so 40 located that its shaft projects upwardly above the lower edge of said driving rim, the project ing portion of said motor shaft having a smaller ‘and a larger circular driving portion, a lower 7 speed friction idler located between the smaller portion of said motor shaft and said driving rim, a higher speed friction idler located between the larger portion of said motor shaft and said driv ing rim, said motor shaft being movable in either direction along a line substantially perpendicular ‘ a higher speed friction idler located between the larger portion of said motor shaft and said driving rim, said idlers being mounted on mov able supporting members so that they are free to move outwardly to contact said driving rim, 40 said motor shaft being movable in either direc tion along a line substantially perpendicular to a radius of the turntable and being so located that as it is moved in one direction its smaller por tion- drives the turntable at the lower speed 45 through said lower speed idler and said driving rim and as it is moved in the other direction its'larger portion drives the turntable through said higher speed idler and said driving rim, the to a radius of the turntable and being so located arrangement of the parts being such that when that as it is moved in one direction its smaller the motor shaft is in the driving position for portion drives the turntable at the lower speed either idler the point where the driving portion through said lower speed idler and said driving of ~the motor shaftcontacts the idler, the point rim and as it is moved in the other direction its where the idler contacts the driving rim and the larger portion drives the turntableat the higher » point where the axis of the idler supporting speed through said higher speed idler and said member intersects the periphery of the idler are 55 driving rim. " all substantially 120° apart. 3. A two-speed phonograph turntable drive ‘ STUART J. RODGER.