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Патент USA US2106710

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Feb. l, 1938.l
F_. Q_ BARTON
`
2,106,710
PHoNoGRAPH TURNTABLE DRIVING MECHANISM
Filed Feb. 13, 1952
1
`
IN VEN TOR.
Patented Feb. 1, I 1938
UNÍTE
2,106,710
STATES
oFFIClïV
2,106,710v
PHONOGRAPH TURNTABLE DRIVING
MECHANISM
Frederick C. Barton, Haddoníield, N. J., assigner
to Radio Corporation of America, a corpora
tion of Delaware
Application February 13, 19,32, Serial No. 592,704
15 Claims.
My invention relates to phonograph turntable
driving mechanism and, more particularly, is an
improvement over the invention disclosed in the
co-pending application of Benjamin R. Carson,
5 Serial No. 512,244, filed January 30, 1931, and
assigned to Radio Corporation of America.
In reproducing sound from phonograph records
(Cl. 274-9) *
leased, at will, and the inner ball race may be
coupled to either the ball retaining cage or the
loutside race for the purpose of transmittmg mo
tion to the super-incumbent turntable at '78
R. P. M.
-
The novel features that I consider character
istic of my invention are set forth with particu
of the disc type, it is necessary to rotate the disc
larity in the appended claims.
at a constant, predetermined speed. Heretofore,
itself, however, both as to its organization and
its method of operation, together with additional 10
objects and advantages thereof, will best be un
derstood from vthe following description of a
l0 the speed of the usual phonograph record was '78
to 80-` R. P. M. but there recently have been ln
troduced phonograph disc records which require
a speed of approximately 331A; R. P. M. Obvi
ously, if a phonograph is to have commercial
15 merit, it must be so designed that records of
either of the aforesaid types may be reproduced
thereby, at will.
-In the Carson application, speed changing
mechanism >of the type including a plurality of
20 gears is disclosed, together with means whereby,
through proper manipulation-of an adjusting ele
ment, the record supporting platen may be caused
The invention
specific embodiment, when read in connection
with the accompanying drawing, wherein the
single ñgure is a view in vertical cross-section of 15
phonograph turntable speed changing mecha
nism comprising a preferred embodiment of my
invention.
‘
Referring to the drawing, my improved mech
anism comprises a phonograph turntable i hav
idg a, depending boss 3 provided with a trans
verse keyway, or slot, 5 into which extends a
to rotate at 78 or 331/3 R. P. M. Mechanisms of ` transverse pin l carried by a driven spindle 9. A '
the Carson type have gone into extensive public
25 use and have, in general, given a fair degree of
satisfaction.
It has been noticed, however, by
those who are extremely critical, that the gear
teeth in the said Carson mechanism tend to in
troduce minor irregularities into the rotation of
30 the disc, which irregularities cause “wows”, or,
in other words, momentary changes of pitch of
the reproduced sounds.
`
It is, accordingly, an object of my invention to
provide a reducing gear for phonograph mecha
35 nism that shall be smoother in action than the
reducing gears of the Carson type heretofore
known.
It is a further object of my invention to pro
vide mechanism of the type described that shall
40 enable the reproduction of sounds from slow
bearing Il, of any suitable type, may be pro~
vided, whereby the weight of the ydriven spindle 25
and the turntable is supported.
'
'I‘he driven spindle has a ball retaining cage
I3 aiîixed thereto and depending therefrom. A
plurality of balls l5 are provided which are
»maintained in Vspaced relation by the depending 30
i ball retaining cage.
An inner ball race Il is'v
ailixed to the upper end of a driving vspindle I9
co-axial with the ñrst referred to spindle 9, the-
said driving spindle being operatively connected
to a prime mover, such as a motor M, for rota- 35
tion at 78 R. P. M. An outer ball race 2| is pro
vided, to which is affixed a depending element 23.
i The depending element may take the i'orm of
an annular flange completely encircling the outer
speed records without the introduction of objec
ball race and being provided with a plurality of 40
inwardly directed gear teeth, or it may be a sin
tionable “wows”.
gle detent device, as illustrated.
>
It isa further and more speciñc object of my
invention to provide mechanism of the type de
45 scribed that shall be devoid of gears.
In accordance'with my invention, I provide a
phonograph having a. driving spindle adapted to
rotate at 78 R.: P. M., to which is attached ari in
ner ball race.
I further provide an outer ball
50 race which, at will, may be held stationaryand,
in addition, I provide a ball retaining cage hav
ing means aiñxed thereto whereby motion there
of may be transmitted to a phonograph turnta
ble. Inv addition, I provide a speed controlling
device whereby thev outer ball race may be re
> Obviously, if the outer ball race is prevented
from rotating, rotary motion from the inner ball
race will be transmitted to the balls in the re- 45
tainer l 3, and the said ball retainer will be caused '
to rotate at a speed determined by the relative
diametersv of the balls and the inner- ball race. ,
'In order that the outer ball race may be held >
against rotation, I provide a pivoted lever 24, 50
having a ñattened‘end portion 25, which, when
the lever is raised, moves into engagement with
the 4depending velement 23_to restrain it from ro
tating. A supporting device 21 may also be pro-1v
vided, having a slotted end 29 into which the end 55
2,106,710
2
25 of the lever moves, and which supports the
lever against the torque of the element 23.
In the event that it is desired to rotate the turn- ’
table at '78 R. P. M., it is, of course, necessary to
Gl release the outer ball race and to lock the inner
7. The invention set forth in claim 6 char
acterized in that means are provided whereby said
motion transmitting spindle may be operatively
and immediately connected to a portion of said
motion transmitting mechanism.
and outer races together, as heretofore explained.
For this purpose, I provide a collar- 3l slidably
8. In combination, a driving spindle, a driven
spindle, motion transmitting- mechanism of the
mounted on the lower driving spindle I9 and so
planetary type jointly carried by said spindles, said
dispose another end portion 33 of the aforemen
tioned operating- lever that the collar may be
moved axially of the said spindle. The collar is
by the driving spindle, a ball spacing cage car
mechanism comprising an inner ball race carried
ried by the driven spindle, and an outer ball race
provided wtih a pin 35 which extends outwardly
into the path of the element depending from the
outer ball race.
When the lever is depressed to
15 the position shown’in the drawing, the outer ball
disposed in operative relation to said ball spacing
cage and said inner race.
9. In combination, a spindle adapted to be
driven at a definite speed, a turntable support
race is released and the pin carried by the collar _ ing and driving spindle, power transmission means
engages the depending element’23 and thus effec
tively locks the inner spindle to the outer ball race.
Inasmuch as the relative sizes of the several
ball races and the diameters of the balls, them
selves, may be readily calculated by anyone skilled
in machine design who is provided with the neces
~ sary handbooks, it is my opinion that detailed cal
culations need not be given in order to render
my disclosure complete.
-
‘
'
. It will be apparent, from the foregoing dis
closure of my improved phonograph platen driv
_ ing mechanism that, through its utilization, turn
table speeds of either 78 or 331/3 R. P. M. may
30 be had >at will.
It should further be apparent
that, inasmuch as all gearing has been omitted,
the turntable, when rotating at, 331/3 R. P. M., will
be extremelysteady and its speed will not vary in
a manner to introduce “wows”.
35
Although I have shown and described a speciñc
embodiment of my invention, I am fully aware
that many modifications thereof will be readily
apparent to those skilled in the art to which it
of the planetary ball type frictionally geared to
said first-named spindle, power take-off means
carried by and depending from said turntable
spindle and adapted to cooperate with the balls of
said transmitting means whereby said first and
second named spindles are indirectly coupled to
gether, and means for locking a portion of said
transmission means against rotation at -will to
cause said turntable spindle to rotate'relatively
to said first-named spindle.
10. The combination with a phonograph turn
table adapted to rotate records of different re
producing speeds, of a motor for driving said
turntable, a shaft driven by said motor at a pre
determined speed having a driving member on
the end thereof, a spindle connected with said
turntable having a driven member mounted there
on, said driven member being adapted to em
brace said driving member, a plurality of balls
mounted for rotation in said driven member
adapted to be engaged and rotated by said driv
ing member, and means for clamping said balls in
non-rotating position for locking with said driv
pertains. My invention, therefore, is not to be ' ing member whereby said turntable will be di 40
rectly driven'thereby, and release said balls for
-iO restricted except insofar as is necessitated by the
prior art and. by the spirit of the appended claims. _
permitting rotating movementfthereof whereby
I claim as my invention:
said driven member will be indirectly driven there
1. In combination, a phonograph record sup
through for rotating said turntable at a slower
porting platen, a spindle adapted to be driven at a
definite speed, speed changing mechanism of the
planetary type frictionally geared to the spindle
and positioned between said spindle and said
platen, and means for restraining from rotating,
at will, a portion of said mechanism.
50
'
2. In combination, a spindle adapted to be ro
'tated at av predetermined speed, planetary gear
mechanism comprising a plurality of ball races
and a plurality of balls associated therewith car
ried by said spindle, a record driving spindle and
speed.
y
'
45
11. The combination with a phonograph turn
table adapted to`rotate records of different re
producing speeds, of a motor for driving said
turntable, a. shaft driven by said motor at a pre
determined speed having a driving member on the 50
end thereof, a spindle connected with said turn
table having a driven member mounted thereon,
said driven member being adapted to embrace said
driving member, a plurality of balls mounted for
rotation in said driven member adapted to be
55 a ball spacing cage depending from said spindle _ engaged and rotated by' said driving member,
and adapted to cooperate with the said balls to means for clamping said balls in non-rotating
transmit motion to said turntable driving spindle.
3. The invention set forth in claim 2 char
acterized in that means are provided for, at will,
60 effectively locking said ball races together, to
prevent relative motion-therebetween.
4. The invention set forth in _claim 2 char
acterized in that means are provided whereby-the
lower spindle may be, at will, effectively locked
position for locking with said driving member
whereby said turntable will be directly driven
thereby, and release said balls for permitting ro 00
tating movement thereof whereby said driven
member will be indirectly driven therethrough
for rotating said turntable at a slower speed, and
manually operated means for altering the driving
function of said balls as above set forth.
es
65 to the outer race.
12. The combination with >a phonograph turn- `
5; As an article of manufacture. a record platen . table adapted to rotate records of different re
supporting and driving spindle provided with a
depending ball spacing cage.
.
6. In combination, a spindle adapted to be
70 driven ata predetermined speed, a record platen
supporting spindle, motion transmitting means of
the planetary type jointly carriedlby said spindles,
and means for, at will, locking a portion of said
motion transmitting means against rotation
‘Il
producing speeds, of a motor for driving said
lturntable, a shaft driven by said motor at a
predetermined speed having a driving member on 70
the endr thereof, a spindle connected with said
turntable having a driven member mounted
thereon, said driven member being adapted to ’
embrace said driving member,y a plurality of
balls mounted for rotation in`said driven mem- 75
2,106,710
ber adapted to be engaged and rotated by said
3
turntable having 'a driven vmember mounted
thereon, said driven member being adapted to
embrace said driving member, a stationary sup
causing said driven member to be directly driven ' port for said turntable and spindle, a plurality of
therethrough and unlocked therefrom to provide balls mounted for rotation in said driven mem
a ball race for said balls for obtaining a slower ber adapted to be engaged and rotated by said
driving member, and a ball race adapted to be
locked with said balls and driven member for
speed.
13. The combination with a phonograph turn
table adapted to rotate records of different re
producing speeds, of a motor. for driving said
driving member, a ball race' adapted to be locked
with said balls and driven member for causing
said driven member to be directly driven there
through and unlocked therefrom to provide a 10
turntable, a shaft driven by said motor at a pre
ball race for said balls for obtaining a slower
determined speed having a driving member on
the end thereof, a spindle connected with said
speed, and a clutch member for locking said
race with said driving member while releasing
turntable having a driven member mounted
it from the support when said clutch is in one> \
position and when in the otherposition locking
embrace said driving member, a plurality of balls the same with said support while releasing it
mounted for rotation in said driven member from said driven member.
15. The combination with a phonograph turn
adapted to be engaged and rotated by said driv
ing member, a ball race adapted to be locked with ' table adapted to rotate records of different re
said balls’and driven member for causing said producing speeds, of a motor for driving said 20
driven member to be directly driven therethrough turntable, a drive shaft driven by said motor at
and unlocked therefrom to provide a ball race a predetermined speed of rotation, means for
for said balls for obtaining a slower speed, and frictionally connecting said turntable with said
drive shaft whereby said turntable will be di
manually actuated means for locking and un
rectly driven at the same speed of rotation, and 25'
locking said bail race.
El thereon, said driven member being adapted to
14. The combination with a phonograph turn
means for releasing said frictional contact and
table adapted to rotate records of different re- ' applying iii-piace thereof a diiîerential speed
producing speeds, of a motor for driving said
turntable, a shaft driven by said motor at a pre
determined speed having a driving member on
the end thereof, a spindle connected with said
transmission for imparting to said turntable a
decreased speed of rotation.
30
FREDERICK C. BARTON.
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