US785362A - Talking-machine. - Google Patents

Talking-machine. Download PDF

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Publication number
US785362A
US785362A US7644301A US1901076443A US785362A US 785362 A US785362 A US 785362A US 7644301 A US7644301 A US 7644301A US 1901076443 A US1901076443 A US 1901076443A US 785362 A US785362 A US 785362A
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arm
record
sound
machine
talking
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US7644301A
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Eldridge R Johnson
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Victor Talking Machine Co
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Victor Talking Machine Co
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20Driving; Starting; Stopping; Control thereof
    • G11B19/2009Turntables, hubs and motors for disk drives; Mounting of motors in the drive

Definitions

  • My invention relates to certain improvements in talking-machines, and more particularly to the type wherein the tlatrecord-disks are employed.
  • the objects of my invention are to generally improve the construction of this class of machines with the view of obtaining clearer and more perfect reproductions and increasing or amplifying the sound-waves transmitted from the sound-box or reproducing device.
  • my invention resides mainly in providing a rigidly-mountcd hollow reproducing-arm capable of a lateral movement, having the sound-box rigidly se- 5 cured to the free end of said arm and having a sound-conveying tube secured to the other end of the arm which is connected with a' rigidly-mounted horn, the said horn being supported independeutl y of the reproducing-arm,
  • My invention further resides in providing im n-oved mechanism for yieldingly mounting the turn-table or record-support and in proriding means for throwing and keeping the record-tablet in yielding contact with the stylus during the reproduction, also in providing means for removing the said record from its contact with the stylus and simultaneously 4 stopping the operation of the machine.
  • FIG. 1 is a side elevation of a talkingmachine embodying my improvements, the lower portion of the motor casing being broken away.
  • Fig. 2 is a section taken longitudinally through the carrying-arm about on the line 2 2 of Fig. 1.
  • Fig. 3 is a vertical section taken on the line 3 3 of Fig.1.
  • Fig. 4 is an end view of the carrying-arm, showing the sound-box and the manner of securing it to said arm.
  • Fig. 5 is a plan view with the turn-table and reproducing mechanism removed.
  • Fig. (5 is an enlarged sectional elevation taken about on the line ("i 6 of Fig. 5, the greater part of the motor mechanism being omitted.
  • the supporting-arm 2 comprises a hollow tube closed at both ends, having an opening in its for ward end adapted to receive a boss 3, which is formed in the frame of the sound-box.
  • the sound-box is secured lirmly in front of this opening by any effective means, but preferably by means of a stirrup I, which passes around the end of the tube 2, as shown in detail in Fig. 4.
  • a set-screw 5 passes through i a threaded aperture in the stirrup and its end l bears against the arm 2, and thereby securely l holds the sound-box in its proper position.
  • i Adjacent to the outer end of the supportin s arm 2 is a tubular section 6, closed at its bottom and communicating on one side with the interior passage in the arm 2.
  • end of the section 6 is provided with an annular shoulder which forms a boss 7, which fits into a stationary section 8, secured in the bracket 9.
  • the lower end of the section 6 is provided with a pivot-bearing 10, the said pivot being yieldingly mounted in the bracket 9, as illustrated in Fig. 3 of the drawings, the purpose of this being to provide a yielding hearing which is self-adjustable.
  • 11 designates thedriving-spindie of the motor, which is propelled by the well-known spring-propelled gearing, which it has not been deemed necessary to illustrate.
  • the upper end of this driving-spindle projects through the casing and has formed upon the said projecting end a cup 12, into which loosely fits a circular head 13, formed on the end of a short shaft 14.
  • a slot 15 is pro vided in the head 12, into which litsa pin 16, carried by the inner wall of the cup 12, so that the said shaft 14 will revolve with the driving-spindle 11.
  • This hub 17 is supported on two oppositely-disposed pivotbearings 18 and 19, which are set transversely or substantially transversely to the line of travel of the stylus-point during the lateral movement of the repreducer-supporting arm.
  • These pivot-bearings 18 and 19 are threaded through lugs 20, formed on a ring 21, which is secured to the motor-casing by means of the screws 22.
  • the ring 21 has provided on its inner peripheral edge a downwardly-projecting l'iz'mge 23, which bears against the motor-casing, thus leaving an annular space under said ring into which is iitted a ring 2-1, which is provided with a cam portion 25, which is curved upwardl y from the surface of the ring, as shown in Fig. 6.
  • a projection 26 is formed at the upper end of the cam, which limits the movement of the ring 24- when it is turned by the handle 27.
  • This handle 27 is secured to an upturned lip 28, formed on the said ring 24:, and is of a length sufiicient to extend beyond the periphery of the turn-table, so it can be easily reached by the operator.
  • i lxtending from the hub 17 in a line at right angles to its pivotal axis is an arm 29, having its outer The upper veasee f free end secured to a coiled spring 30, which is secured to the machine-casing.
  • This arm 29 normally rests in a substantially horizontal plane and bears against the lower edge of the upwardly-tnrned cam 25, this normal position being shown in Fig. 6.
  • the upper surface of the hub 17 is provided with a ballrace 31, adapted to receive a set of balls 82.
  • the lower side of the turn-table is also provided with a ball-race which fits over the said halls when the turn-table is in position on the short shaft 1a.
  • a threaded nut 38 is screwed over the upper end of the shaft 1& after the turn-table is placed in position, which draws the said shaft up slightly, so as to bring the bottom surface of the head 13 slightly away from and out of contact with the cup-socket 12.
  • a cap 33 may be threaded over the end of the nut 38 for the purpose of lirmly securing the record Bet on its supporting-table.
  • a boss is secured to the motor-casing directly under the outer edge of the turn-table and about in line with the arm 29, as shown in Fig. 1. The upper end of this boss is provided with a leather teat, which will contact with the turn-table when the same is tilted to remove the record from contact with the stylus-point.
  • the stylus-point is in contact with the grooves of the record when the parts are in the position shown in Figs. 5 and (5, the spring 30 having a tendency to pull down on the free end of the arm 29, which brings that portion of the record under the styluspoint in constant but yielding contact with said stylus-point.
  • the handle-arm 27 is moved in the direction of the arrow shown in Fig. 5, and the cam 25, bearing against the under side of the arm 29, raises the said arm, which tilts the hub 17 and the turn-table 36 and removes the record from contact with the stylus-point. Thistilting movement also throws the lower edge of the turn-table into contact with the projecting boss 85, thereby stopping the revolution of the turn-table.
  • the shaft 14 which is provided with a circular head 13, adapted to lit loosely in a socket-piece 12, carried by the driving-spindle of the motor, permits of the turn-table yielding slightly in any 1 direction as the bottom of the head 13 is held and the horn is air-tight or sound-proof, a rubber gasket 38 being provided around the opening into which the boss of the sound-box fits, and a gasket 39 being provided around the connection between the tube-sections 6 and 8, so that none of the sound-waves can escape except through the horn.
  • 9 is provided with a ring 40 at its upper end, into which the stationary section 8 is fitted, the said section being held therein by means of the screws 41.
  • a talking-machine the combination, a hollow arm pivoted to move only in a direction parallel to the record, a sound-box fixed to one end of said arm, an amplifying-horn connected with the other end of said arm, and means to allow of a separation of the soundbox and record.
  • a talking-machine the combination, a hollow arm pivoted at one end to move only in a direction parallel to the record, a sound-box fixed to the free end of said arm, an amplifying-horn connected with the pivoted end of said arm, a record-support and means for withdrawing the record and record-si'ipport from the sound-box.
  • a talking-machine the combination, a hollow arm pivoted at one end to move only in a direction parallel to the record, a sound-box fixed to the free end of said arm, an amplifying-horn connected with the pivoted end of said arm, a record-support, and means for withdrawing the record and record-support from the sound-box.
  • a talking-machine the combination of a hollow arm pivoted at one end to move only in a direction parallel to the record, a soundbox fixed to the free end of said arm, a bracket carried by the machine-casing, a rigid connecting-piece carried by said bracket adapted to communicate with the pivoted end of said arm, and a turntable separable from the sound-box.
  • the bracket-arm 7 In a talking-machine, the combination of a hollow arm pivoted to move only in adirection parallel to the record, a sound-box fixed to the free end of said arm. a bracket rigidly secured to the machinc-casing, a hollow huh carried by said bracket and communicating with the interior of said arm, a statioi'iary tube rigidly secured in said bracket and communicating with said hub, sound-conveying means attached to said tube and means to allo Y a separation of the sound-box and record.
  • the combination 01 a hollow arm pivoted at one end to move only in a direction parallel to the record, a soundbox fixed to the free end of said arm, a bracket rigidly secured to the machine-casing, a tubular section rigidly secured to said bracket, a hollow hub pivotally mounted in said bracket and connecting with said tubular section and having communication with the interior of said arm, an amplifying-horn pivotally connected to said tubular section and means to allow of the separation of the reproducer and record.
  • the combination 0 l a hollow arm pivoted at one end to move only in a direction parallel to the record, a soundbox fixed to the free end oi said arm, a bracket carried by the machine-casing in which the inner end of the hollow arm is pivoted, a tubular section carried by said bracket, and a part telescoping with said tubular section and having communication with the interior of the hollow arm, and an amplifying-horn carried by said tubular section and means for holding the record in yielding contact with the sound-box and allowing the same to be separated from the soundbox.
  • a talking-machine the combination of a hollow arm closed at both ends and pivotally mounted to move in a direction parallel with the record and having an opening adjacent its free end, a sound-box mounted on the free end of said arm and having communication with said opening, a hollow hub secured adjacent the pivoted end of said hollow arm and having communication with the interior thereof, a. support in which said hub is vertically pivoted, a fixed tube carried by said sup port and telescoping with said hub, means for holding said hub in telescoped relation with said tube, a horn pivotally carried by said tube and means to allow separation of the soundbox and record.
  • a talking-machine the combination of a hollow arm, a sound-box connected to one end thereof, a vertical hollow hub connected to the opposite end thereof, a l'ixed support, a vertical tube carried by said support, and spring-actuated means For keeping said hub in operative connection with one end of said tube.
  • the said stub-shaft passing through the pivoted hub, means for connecting the stub-shaft head with driving-shaft so as to revolve therewith, and a nut adapted to the end of the stubshaft for clamping the record-support thereto, substantially as described.

Description

No. 785,362. PATENTED MAR. 21, 1905.
B. R. JOHNSON.
TALKING MACHINE.
APPLICATION FILED SEPT. 25. 1901.
- 2 SHEETS-SHEET 1.
No. 785,362. Q PATENTED MAR. 21, 1905. E. R. JOHNSON TALKING MACHINE.
APPLICATION FILED SEPT. 25, 1901.
2 SHEETS-SHEET 2.
'llllllllllllllllllllflIIIIIHIIIIIIIllllllllllllllllllllllllllllllllllllllllllllllllllltllw 1710611301: Z/Jdriaf'ye Jvhmarz UNITED STATES l atented March 21, 1905.
PATENT TO VICTOR TALKING MAOHIIIE JERSEY.
TALKING- COMPANY, A CORPORATION OF NIGXY MACHINE.
SEELI'FICATION forming part of Letters Patent No. 785,362, dated March 21, 1905.
Application fired September 25, 1901, Serial No. 76,4543.
1?) MN. wit/unit IIZ/(I/Z/ cancel-71 Be it known that I, ELDRTDGE R. Joirnson, a citizen of the United States, and a resident of the city of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Talking-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this speci- I tication.
My invention relates to certain improvements in talking-machines, and more particularly to the type wherein the tlatrecord-disks are employed.
The objects of my invention are to generally improve the construction of this class of machines with the view of obtaining clearer and more perfect reproductions and increasing or amplifying the sound-waves transmitted from the sound-box or reproducing device.
With these objects in view my invention resides mainly in providing a rigidly-mountcd hollow reproducing-arm capable of a lateral movement, having the sound-box rigidly se- 5 cured to the free end of said arm and having a sound-conveying tube secured to the other end of the arm which is connected with a' rigidly-mounted horn, the said horn being supported independeutl y of the reproducing-arm,
3 thereby taking the weight of the same otl of the reproducer and its stylus.
My invention further resides in providing im n-oved mechanism for yieldingly mounting the turn-table or record-support and in proriding means for throwing and keeping the record-tablet in yielding contact with the stylus during the reproduction, also in providing means for removing the said record from its contact with the stylus and simultaneously 4 stopping the operation of the machine.
In machines of this character where the horn is secured directly to the sound-box and supported by the sound-box-carrying arm a portion of the weight of said horn is thrown on the stylus-point, which unless the arm and horn be very nicely adjusted will hurt the quality of the reproduction by causing harsh and grating sounds. This increased weight also causes the record-grooves to wear out more quickly, and thus lose theiretlectiveness, and, further, in such a construction it it is desired to use a larger horn a longer reprod ueerarm must be provided, and consequently a longer supporting-bracket. In my improved construction, as herein setforth, these ditiiculties are entirely obviated, as the weight of the horn is supported entirely upon the bracket which supports the reproducer-arm, and anysized horn may be used without in any manner affecting the operation of the reproducing mechanism.
My invention is thoroughly illustrated in the accompanying drawings, in which Figure I is a side elevation of a talkingmachine embodying my improvements, the lower portion of the motor casing being broken away. Fig. 2 is a section taken longitudinally through the carrying-arm about on the line 2 2 of Fig. 1. Fig. 3 is a vertical section taken on the line 3 3 of Fig.1. Fig. 4: is an end view of the carrying-arm, showing the sound-box and the manner of securing it to said arm. Fig. 5 is a plan view with the turn-table and reproducing mechanism removed. Fig. (5 is an enlarged sectional elevation taken about on the line ("i 6 of Fig. 5, the greater part of the motor mechanism being omitted.
Referring more particularly to the soundl conveyingmechanisn'i which is shown in Figs. 1 to I, inclusive, 1 designates the sound-box or reproducing device, which may be of an) of the well-known constructions. The supporting-arm 2 comprises a hollow tube closed at both ends, having an opening in its for ward end adapted to receive a boss 3, which is formed in the frame of the sound-box. The sound-box is secured lirmly in front of this opening by any effective means, but preferably by means of a stirrup I, which passes around the end of the tube 2, as shown in detail in Fig. 4. A set-screw 5 passes through i a threaded aperture in the stirrup and its end l bears against the arm 2, and thereby securely l holds the sound-box in its proper position. i Adjacent to the outer end of the supportin s arm 2 is a tubular section 6, closed at its bottom and communicating on one side with the interior passage in the arm 2. end of the section 6 is provided with an annular shoulder which forms a boss 7, which fits into a stationary section 8, secured in the bracket 9. The lower end of the section 6 is provided with a pivot-bearing 10, the said pivot being yieldingly mounted in the bracket 9, as illustrated in Fig. 3 of the drawings, the purpose of this being to provide a yielding hearing which is self-adjustable. To the stationary section 8 is secured the small end of the amplifying-horn, a portion of which is illustrated in dotted lines in Fig. 1. I have found it preferable to have the arm 2 extend slightly beyond the entrance of the opening into the section 6, as better results are oi tained from such a construction.
Referring particularly to Figs. 5 and 6 of the drawings, 11 designates thedriving-spindie of the motor, which is propelled by the well-known spring-propelled gearing, which it has not been deemed necessary to illustrate. The upper end of this driving-spindle projects through the casing and has formed upon the said projecting end a cup 12, into which loosely fits a circular head 13, formed on the end of a short shaft 14. A slot 15 is pro vided in the head 12, into which litsa pin 16, carried by the inner wall of the cup 12, so that the said shaft 14 will revolve with the driving-spindle 11. A circular hub 17, having an annular recess 18 formed in its lower end, iits loosely over the top of a cup 12, and is provided with a central aperture through which the short shaft 14L passes. This hub 17 is supported on two oppositely-disposed pivotbearings 18 and 19, which are set transversely or substantially transversely to the line of travel of the stylus-point during the lateral movement of the repreducer-supporting arm. These pivot- bearings 18 and 19 are threaded through lugs 20, formed on a ring 21, which is secured to the motor-casing by means of the screws 22. it will thus be seen that the hub 17 is capable of a swinging movement in a direction transversely to its pivotal axis. The ring 21 has provided on its inner peripheral edge a downwardly-projecting l'iz'mge 23, which bears against the motor-casing, thus leaving an annular space under said ring into which is iitted a ring 2-1, which is provided with a cam portion 25, which is curved upwardl y from the surface of the ring, as shown in Fig. 6. A projection 26 is formed at the upper end of the cam, which limits the movement of the ring 24- when it is turned by the handle 27. This handle 27 is secured to an upturned lip 28, formed on the said ring 24:, and is of a length sufiicient to extend beyond the periphery of the turn-table, so it can be easily reached by the operator. i lxtending from the hub 17 in a line at right angles to its pivotal axis is an arm 29, having its outer The upper veasee f free end secured to a coiled spring 30, which is secured to the machine-casing. This arm 29 normally rests in a substantially horizontal plane and bears against the lower edge of the upwardly-tnrned cam 25, this normal position being shown in Fig. 6. The upper surface of the hub 17 is provided with a ballrace 31, adapted to receive a set of balls 82. The lower side of the turn-table is also provided with a ball-race which fits over the said halls when the turn-table is in position on the short shaft 1a. A threaded nut 38 is screwed over the upper end of the shaft 1& after the turn-table is placed in position, which draws the said shaft up slightly, so as to bring the bottom surface of the head 13 slightly away from and out of contact with the cup-socket 12. A cap 33 may be threaded over the end of the nut 38 for the purpose of lirmly securing the record Bet on its supporting-table. A boss is secured to the motor-casing directly under the outer edge of the turn-table and about in line with the arm 29, as shown in Fig. 1. The upper end of this boss is provided with a leather teat, which will contact with the turn-table when the same is tilted to remove the record from contact with the stylus-point.
In operation the stylus-point is in contact with the grooves of the record when the parts are in the position shown in Figs. 5 and (5, the spring 30 having a tendency to pull down on the free end of the arm 29, which brings that portion of the record under the styluspoint in constant but yielding contact with said stylus-point. After the reproduction has been completed the handle-arm 27 is moved in the direction of the arrow shown in Fig. 5, and the cam 25, bearing against the under side of the arm 29, raises the said arm, which tilts the hub 17 and the turn-table 36 and removes the record from contact with the stylus-point. Thistilting movement also throws the lower edge of the turn-table into contact with the projecting boss 85, thereby stopping the revolution of the turn-table. In starting again the arm 2 is moved until the stylus-point is directly over the beginning of the recordgroove, when the handle 27 is then moved to the left, which allows the arm 29 to drop un der the action of the spring 30, which action throws the record into contact with the st \;'lus point by tilting the turn-table, while at the same time removing the said table out of contact with the brake-boss 35. The shaft 14, which is provided with a circular head 13, adapted to lit loosely in a socket-piece 12, carried by the driving-spindle of the motor, permits of the turn-table yielding slightly in any 1 direction as the bottom of the head 13 is held and the horn is air-tight or sound-proof, a rubber gasket 38 being provided around the opening into which the boss of the sound-box fits, and a gasket 39 being provided around the connection between the tube- sections 6 and 8, so that none of the sound-waves can escape except through the horn. 9 is provided with a ring 40 at its upper end, into which the stationary section 8 is fitted, the said section being held therein by means of the screws 41.
Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-- 1. In a talking-machine, the combination a hollow arm limited to move only in a direction parallel to the record, a sdiiiid-box fixed to one end of said arm, an amplifying-horn connected with the other end of said arm, and means to allow of a separation of the soundbox and record.
2. In a talking-machine, the combination, a hollow arm pivoted to move only in a direction parallel to the record, a sound-box fixed to one end of said arm, an amplifying-horn connected with the other end of said arm, and means to allow of a separation of the soundbox and record.
3. In a talking-machine, the combination, a hollow arm pivoted at one end to move only in a direction parallel to the record, a sound-box fixed to the free end of said arm, an amplifying-horn connected with the pivoted end of said arm, a record-support and means for withdrawing the record and record-si'ipport from the sound-box.
4. In a talking-machine, the combination, a hollow arm pivoted at one end to move only in a direction parallel to the record, a sound-box fixed to the free end of said arm, an amplifying-horn connected with the pivoted end of said arm, a record-support, and means for withdrawing the record and record-support from the sound-box.
In a talking-machine, the combination of a hollow arm pivoted at one end to move only in a direction parallel to the record, a soundbox fixed to the free end of said arm, a bracket carried by the machine-casing, a rigid connecting-piece carried by said bracket adapted to communicate with the pivoted end of said arm, and a turntable separable from the sound-box.
6. In atalking-imichine, the combination of a hollow arm pivoted at one end to move only in a direction parallel with the record, a sound box fixed to the free end of said arm, a bracket carried by the machine-casing, a vertical hollow hub pivotally mounted in said bracket and communicating with the inner end of said arm, a hollow stationary section also carried by said arm and communicating with said hub and means to allow a separation of the soundbox and record.
The bracket-arm 7. In a talking-machine, the combination of a hollow arm pivoted to move only in adirection parallel to the record, a sound-box fixed to the free end of said arm. a bracket rigidly secured to the machinc-casing, a hollow huh carried by said bracket and communicating with the interior of said arm, a statioi'iary tube rigidly secured in said bracket and communicating with said hub, sound-conveying means attached to said tube and means to allo Y a separation of the sound-box and record.
8. In a talking-machine, the combination 01 a hollow arm pivoted at one end to move only in a direction parallel to the record, a soundbox fixed to the free end of said arm, a bracket rigidly secured to the machine-casing, a tubular section rigidly secured to said bracket, a hollow hub pivotally mounted in said bracket and connecting with said tubular section and having communication with the interior of said arm, an amplifying-horn pivotally connected to said tubular section and means to allow of the separation of the reproducer and record.
9. in a talking-machine, the combination 0 l a hollow arm pivoted at one end to move only in a direction parallel to the record, a soundbox fixed to the free end oi said arm, a bracket carried by the machine-casing in which the inner end of the hollow arm is pivoted, a tubular section carried by said bracket, and a part telescoping with said tubular section and having communication with the interior of the hollow arm, and an amplifying-horn carried by said tubular section and means for holding the record in yielding contact with the sound-box and allowing the same to be separated from the soundbox.
10. In a talking-machine, the combination of a hollow arm closed at both ends and pivotally mounted to move in a direction parallel with the record and having an opening adjacent its free end, a sound-box mounted on the free end of said arm and having communication with said opening, a hollow hub secured adjacent the pivoted end of said hollow arm and having communication with the interior thereof, a. support in which said hub is vertically pivoted, a fixed tube carried by said sup port and telescoping with said hub, means for holding said hub in telescoped relation with said tube, a horn pivotally carried by said tube and means to allow separation of the soundbox and record.
11. In a talking-machine, the combination of a hollow arm, a sound-box connected to one end thereof, a vertical hollow hub connected to the opposite end thereof, a l'ixed support, a vertical tube carried by said support, and spring-actuated means For keeping said hub in operative connection with one end of said tube.
12. In a talking-nlachine, the combination with a rigidly-mounted reproducer, of a yield ingly-mounted record-support, a hub pivot ally mounted on the machine-casing, a driving-shaft having a cup-shaped top, a stubshat't having an enlarged head adapted to it loosely in the cup portion of the driving-shaft. the said stub-shaft passing through the pivoted hub, means for connecting the stub-shaft head with driving-shaft so as to revolve therewith, and a nut adapted to the end of the stubshaft for clamping the record-support thereto, substantially as described.
13. The combination with a vertically-rigid reprodueer of a revolving driving-spindle, an enlarged head formed on the upper end of said spindle having asocket formed therein, a hubpiece adapted to fit loosely over the head, pivotal bearings carried by the machine-frame in which the hub-piece is mounted, a stub-shaft passing through the hub, a head formed on said shaft adapted to [it loosely in the socket of the driving-spindle, means for coupling the said head to the driving-spindle head, a turntable secured on the upper end of the stubshaft, ball-bearings between the turn table and and extending radially therefrom, a spring for holding said arm down, and a cam located adjacent the arm, adapted to act on the same to raise said arm and tilt the turntable, substantially as described.
In witness whereof I have hereunto set my hand this 24th day oi September, A. l). 1901.
ELDRI DGE R. J01 INSON. Vi tnesses:
Ciuntns H. Srnommx J. lluypm-zsox'.
US7644301A 1901-09-25 1901-09-25 Talking-machine. Expired - Lifetime US785362A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777699A (en) * 1949-08-20 1957-01-15 Ben H Woodruff Automatic record player

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777699A (en) * 1949-08-20 1957-01-15 Ben H Woodruff Automatic record player

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