US2006660A - Turntable driving mechanism - Google Patents

Description

July 2, 1935. VAN DER wou E 2,006,660

TURNTABLE DRIVING MECHANI SM Filed Feb. 25, 1932 A m A A M u a,

. INVENTOR. fi'itz Van der Made fig 6. ATTORNEYS.

muted July-2,1935. t 2,006,660

UNITED STATES PATENT OFFICE TURNTABLE DRIVING MECHANISM Fritz van der Woude, Elyria, Ohio, assig'nor to The General Industries Company, Elyria, Ohio, a corporation of Ohio Application February 25, 1932, Serial No. 595,012 6 Claims. (01. 192-422) This invention relates to driving mechanisms the following description taken in connectionv for phonographs or the like and particularly to with the accompanying drawing in which: mechanisms for varying the speed of power Fig. 1 is a cross-sectional view of a mechanism transmission from the power supply motor to the embodyi y invention, with parts t eof in phonograph or the like turntable. elevation; 5

It has been customary for some time to drive 2 iS a View t an enlarged Scale of a P the turntables of phonographs such as are used 0f 1 SheWing in Cross-Section p ts w ich i in the home at a standardized speed of 78.2 1 are Shown in elevation; revolutions per minute and when the power is 3 is a View taken approximately from t e supplied by electric motor suitable gearing or plane 3 0 1, With Some Of the Parts b l 10 other transmission mechanism has been inter-v the p a the View Omitted, and illustrating posed between the motor and the turntable to a Shifting mechanism Which I y p y; effect a reduction of speed to that value. 4 i a view taken from t plane 4-4 of The introduction of talking moving pictures employing a phonograph to roproduoe the voice Fig. 5 is a View Of a clutch element forming 15 or other sounds has led to' the development of P of the mechallism of Figs- 3 and eV W phonographic reproducing apparatus having 1- of the element being taken as from the plane 5 atively large record discs driven ,at a lower of E gspeed, and a speed of 33 revolutions per minute 15 F Vlew slmllar to 1, lllllstmtlng has been continuously employed in this art. modlfilfatlon- 20 It is therefore one of the objects of this inven- Refen'mg to th drawmg, I h shown at l on to provide a transmission or driving mecha a turntable driving shaft generally vertically msm whereby a phonograph turntable may be disposed ha ing a pin 2 extending transversely driven either at a predetermined high speed or therethmugh engagmg notch notches 3 of at a predetermined low speed and optionally a turntable head supporting turntable 25 proper 5 whereby the turntable 5 may be supported upon and rotated by the shaft I.

A main frame -6 has rotatably mounted in a generally vertical bore I coaxial with the shaft I, the hub 8 of a gear 9, to be more fully described, the hub extending upwardly through and outwardly of the bore 1 and having a collar l0 secured thereto by a set screw H, the collar engaging on its lower face a boss l2 of the main frame; whereby the gear 9 is rotatably changed from one to the other in an improved manner.

Another object of my invention is to provide improved mechanism whereby a phonograph turntable may be driven either at a speed of 78.2 revolutions per minute or at 33 revolutions per minute and whereby the shift from one to the other may-be conveniently efiected.

Another object is to provide improved mechamsm of the class referred to in which the change supported in the frame The hub a has a from one speed to the other may be effected b ore l3 therethrough constltutmg a rotary bearwithout the disengagement and re-engagement mg for the shaft on a portion thereof 3 5? t t h cent the turntable 5. The lower end of the shaft 0 er 0 380 is 0 mec I is reduced in diameter to provide a trunnion 40 nism of the class referred to in which the speed H which is rotatably mounted in a bore '5 m refiucmn Pwer Such as F electhe frame, the bore I5 being of the nature of tnc motor may be made through contmmusly a cup-like recess; and a steel ball I6 is disposed meshed gearsin the bottom of the recess and upon the ball Another Object is Provide for the P the extreme end of the trunnion l4 rests, the 45 of pho o p the like turntables, an 1111' construction thus providing an end thrust bearproved simple two-speed transmission meehaing ll-IG and a rotary bearing |4 |5 for the nism between the power-supplying motor and shaft the turntable, adapted to transmit power at two A worm gear [1 having h b 13 is rotatably predetermined Speeds, and provided w mounted on the shaft I and the end IQ of the 50 proved means for effecting the change from one hub abuts upon a, boss 20 on the frame 6 to speed to the other. v axially support the gearl Other objects of my invention will be apparent At 22 I have shown a counter-shaft, disposed to those skilled in the art to which my invention generally parallel to the shaft I and spaced latappertains. My invention is fully disclosed in erally therefrom and provided with a trunnion 55 23 on its lower end, rotatably supported in a bore or recess 24 and supported on a ball 28 in the recess, the construction providing a rotary bearing 23-24 and an end thrust bearing 24-28 which may be similar to the corresponding bearings above described for the shaft I.

The opposite end of the shaft 22 is provided with a trunnion 28of reduced diameter rotatably mounted in a bearing bore 21 in the frame 8.

A gear 28 and a gear 29 are rigidly secured to the shaft 22 as by keys 30 and 3I respectively.

The gears I I and 28 are disposed to mesh with a worm 32, preferably on opposite sides of the worm, and to'be rotatably driven thereby. The worm 32 is adapted in a well known manner to be rotated by an electric motor not shown and which may be of any suitable or well known construction; and which is preferably designed or has regulating apparatus associated therewith so that it will drive the worm 32 .at a substantially constant speed.

The gears I1 and 28 have preferably the same number of teeth, which is proportioned to the rate of revolution of the worm 32 to cause the gears I1 and 28 to rotate at a speed of substantially 78.2 revolutions per minute.

The gear 29 is meshed with the gear 9, above described, and the relative. numbers of teeth in these two gears is determined so that the gear 9 will be rotated at 33.33 revolutions per minute by the above described movement transmitted by the worm 32 to the gear 28 and by shaft 22.

Secured to each of the gears 9 and I1 and by confronting each other coaxially, are two crown clutch elements 33.and 34, respectively, being formed preferably from sheet metal and generally of flat cup-form, having relatively large perforations 35-35 centrally of the cup bottom 38 through which perforations the shaft I extends, and the cup bottom 38 being rigidly connected to the gears 9 and I1 by screws 3'I3I. The outer edge of the skirts of the cups 33 and 34 are provided with an annular row'of' notches 3838 and thus form each one element of a clutch.

The other element of the clutch comprises an annular body 40 having a bore 4I therethrough, through which the shaft I extends, and being controlled to rotate with the shaft I or, optionally, tomove axially thereupon by means of a key-construction comprising a key 42 secured to the," shaft I and a key-way 43 in the clutch member 40. At oppositeaxial ends of the body member 40, thereis provided a plurality such as four radially extending-pins "-44. When the clutch body 40 is moved in either direction axially on the shaft I, the said pins 44 may be thereby projected into the notches .38 of one or the other of the clutch elements 33-34 to thus lock or clutch the gears 9 and I1 alternatively to the shaft I, in a manner that will be understood.

To reciprocate, alternatively, the clutch body member 40, it is provided with an annular groove 48 in which inwardly radially extending shift pins 48-48 extend, the pins being carried by a shift fork 41 having a portion intermediate the pins 48 connected to a clutch shaft 48.

The clutch shaft 48 is disposed generally at right angles to the shafts I and 22 and is supported at one end in a suitable rotational hear: ing 49 (see Fig. 1), and. disposed on one side of the shift fork 41, and in a rotational bearing 50 on the other side of the fork. The shaft extends outwardly through the bearing 80 and clutch member 40,

at its termination as at II is provided with a radially extending arm 32 through the agency of which rotary movement or oscillatory movement may be given to the shaft 48 to turn it and to thereby shift the clutch in the manner above described.

To move the arm 52, a generally vertical control shaft 83 is rotatably mounted in a suitable bearing on the main frame 8, (See Fig. l), and carries a radially extending arm 54 having a slot 55 through which the arm 52 above described projects. Thus, see Figs. 1 and 3, rotation or oscillation of the shaft 53 will communicate a corresponding movement to the shaft 48. In the preferred construction, a compression spring 56 surrounds the shaft 53, abuts at one end at its other end abuts upon a head 58 of an adjusting arm 59 secured to the shaft 53. The spring 58 thus may exert friction to hold the shaft 53 in either of its two operative positions or in a neutral therebetween; and the construction also disposes the regulating arm 59 in a plane parallel to the turntable 5 and permits the disposal of the arm 59 above the other parts of the frame 8 whereby theframe 8 and its power transmission part may be disposed under a cabinet panel and concealed from view. Thus, as will be understood to be desirable, the turntable 5 and the arm 59 alone may be visible above a generally horizontal cabinet panel.

The operation of the embodiment of my invention of Figs. l'to 5 inclusive will now be clear.

Upon moving the arm 59 in either direction to turn the shaft 53, this movement will be communicated to the shaft 48 to raise or lower, with respect to the shaft 40. If it be raised, the pins 44 thereof engaging notches 38 of the clutch member 33, will lock the gear 9 by the shaft I. Rotary movement from the worm 32 will then be transmitted through the gear 28, shaft 22, gear 29, gear 9, to the shaft ,I, to rotate the turntable 5 at approximately 33.3 revolutions per minute. If the however, be moved downwardly, the pins 44 thereof will engage notches 38 of the clutch member 38,and will lock the gear H to the shaft I, and motion transmitted from the worm 32 to the gear I! to the shaft I will rotate the shaft at the rate of 78.2

revolutions per minute.

In the modified form of my invention shown in Fig. 8, a housing I is provided; and two gears IM and I02 are rigidly mounted on a turntable driving shaft I03, the shaft being rotatably mounted in a bearing bore I04 in the housing and on its lower end being supported as at I by a rotational and end thrust bearing which may be like or similar to that described in connection with Fig. 1. a

A counter-shaft I08 laterally spaced'from the shaft I03 and generally parallel thereto is supported by a rotational and end thrust bearing III similar to the bearing I 05, and at" its opposite or upper end is rotationally supported in a bore II2 formed in the hub II3 of a gear I09, the gear itself being rotatably mounted in the frame I00 by its hub H3 in a bore H8 in the frame I00, and being supported axially by a collar III secured to the hub H3 by a set screw I I8, and the lower face of the collar II'I bearing upon a boss H9 of the frame.

By this construction the gear I09 and the shaft I08 may rotate independently of each other but are maintained coaxial.

upon a boss 51 of the frame 8 and I, the clutch member A gear I00 is rotatably mounted on the shaft I06 and is supported axially on the shaft by the engagement of a hub portion H8 thereof with a hub portion II9 of a gear I01 rigidly connected to the shaft I06 and meshed with a driving worm H0. The gear I00 meshes with the gear I02, and the gear I09 meshes with the gear IOI above described.

Intermediate of the gears I09 and 108 and coaxial with the shaft I00 is a movable clutch member which may be identical with that described in connection with Figs. 1 to 5 inclusive; and correspondingly, the gears I08 and I09 are provided with opposite confronting clutch members I20 and I2| secured respectively to the gears I08 and I09.

Rotation of the worm IIO will rotate the shaft I00 through the gear I01. The clutch member indicated generally at 40 may be raised or lowered by corresponding movement of the arm 59' as has been more fully described in connection with the clutch member 40 and arm 59 of Fig. 1. When the clutch member 40' is lowered, the clutch member I20 will be thereby locked to the shaft I06 and rotary movement from the worm IIO will be transmitted through the gear I01, shaft I06, clutch member I20, gear I00, gear I02, and shaft I03. The number of teeth of the gears I01, I08'and I02 may be determined, in view of the rate of revolution of the worm IIO, to rotate the shaft I03 at 78.2 revolutions per minute. I

When the clutch member 40' is elevated, it will lock the clutch member I2I to the shaft I06 and then movement from the worm IIO will be transmitted through the gear I01, shaft I06, clutch member I2I, gear I09, gear IM and shaft I03, and the ratio of gears I09 and MI may be determined so as to drive the shaft I03 at 33.33 revolutions per minute.

With respect to the two forms of my invention above described, it will be observed that in the form shown in Figs. 1 to 5 inclusive, the four gears, I1, 28, 29 and 9 continuously rotate by power from the worm 32 and the gears 9 and I1 are optionally or alternatively drivingly connected to the shaft I.

In the form shown in Fig. 6, only the gear I01 rotates continuously and the gears I09 and I00 are alternatively or optionally connected to the shaft I06 and since these gears are at all times meshed with the gears IOI and I02, they are thus optionally and alternatively connected to the shaft I03 in a manner to drive it.

My invention is not limited to the exact details of construction shown and described inasmuch as many changes and modifications may be made within the scope and spirit of my invention without sacrificing its advantages.

I claim:

1. In a two speed power transmission for the turntables of phonographs and the like of the type comprising a reciprocable clutch element, means for shifting the" clutch element comprising an oscillatably mounted shaft having an arm extending laterally therefrom, an operating arm, and a pin and slot connection between the operating arm and the laterally extending arm to communicate oscillatory movement of the operating arm to said first named arm to oscillate it and thereby oscillate the shaft.

2. In a clutch operating mechanism, a reciprocable clutch element, an oscillatable shaft, means for oscillating the shaft, means for communicating oscillatory movement of the shaft to the clutch element to reciprocably selectively position it comprising an arm member extending laterally from the shaft, a pivotally supported arm having a portion oscillatable in directions at an angle to the laterally extending arm member and connected to the arm member and pivotally movable to defined positions.

3. In a clutch operating mechanism, a reciprocable clutch element, an oscillatable shaft,

means for oscillating the shaft, means for communicating oscillatory movement of the shaft to the clutch element to reciprocably selectively position it comprising an arm member extending laterally from the shaft, a pivotally supported arm having a portion movable in a plane at an angle to the laterally extending arm member and having a pin and slot connection therewith and movable to defined positions.

4. In a clutch operating mechanism, a reciprocable clutch element, an oscillatable shaft, means for oscillating the shaft, means for communicating oscillatory movement of the shaft to the clutch element to reciprocably selectively position it comprising a pivoted arm having a pivot axis at an angle to the axis of the shaft, the shaft having a laterally extending arm, the pivoted arm having a bearing connection with the laterally extending arm and movable to defined positions.

5. In a clutch operating mechanism, a reciprocable clutch element, an oscillatable shaft, means for oscillating the shaft, means for communicating oscillatory movement of the shaft to the clutch element to reciprocably selectively position. it comprising a pivoted arm having a pivot axis at an angle to the axis' of the shaft, the shaft having a laterally extending arm, the pivoted arm having a pin-and-slot connection with the laterally extending arm and movable to defined positions.

6. In a clutch operating mechanism, a main frame, a reciprocable clutch element, supported on an oscillatory shaft on the frame, an arm extending laterally from the shaft, a pivoted arm pivotally movable on the frame on an axis at an angle to the shaft axis and having a bearing connection with the laterally extending arm, for oscillating the shaft, an indicating arm pivoted on the frame for moving the said pivoted arm, and friction brake means for holding the pivoted arm and shaft in predetermined positions.

FRITZ VAN mm WOUDE.

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