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Патент USA US3028523

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April 3, -1962
E. V. SUNDT
3,028,513 >
MOTORIZED DIAL CONTROL MECHANISM
Filed July 29, 1959
2 Sheets-Sheet 1
April 3, 1962
E. v. suNDT
MOTORIZED DIAL CONTROL MECHANISM
Filed July 29, 1959
2 Sheets-Shea; 2
47.24
INVENTOR.
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United States lf'
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3,028,513
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Patented Apr. 3», 1962.V
2
3,028,513
MOTORIZED DIAL CONTROL MECHANISM
Edward V. Sundt, 118»Sterlîng Lane, Wilmette, Ill,
Filed. .Iuly 29, 1959, Ser'. No. 830,321
12 Claims. (Cl. S10-f8.3)
housing member 19, is also provided with a cylindrical
portion 24 which is concentric with the central axis ofY
the bearing 22. The laminations 12 are secured together`
and thebraeket 14 and housing member 19 are secured:
to the laminations 12 by means ofV screws 25.
A motor rotor 23 is arranged within the laminations
and it is carried by a hollow sleeve shaft 27 which isl
motorized dial control mechanismior positioning a device
journalled for rotation on the bearings 16 and22. Thus,
as the coils 13 are appropriately energized, the motor.
automatically by means of» anl electric >motor which may
be; remotelyy controlled and. also manually by manually 10 rotor 23 is rotated in one direction or the opposite` direc
The principal object of thisinventiom is to provide a
manipulating a dial connected to the device, the diall
tion for rotating the sleeve shaft 27. Arranged withiny
always indicating the positiono? the device, Theelectric
the sleeve shaft 27 is av control shaft. 29.which is jour
nalled for rotation adjacent one end by thek bearing 16;
motor operates through` a differelritial> gear reducer» for
and whichis journalled for rotation adjacent its other end:
positioning the deviceandlfriction means associated with
by an intermediate member 42. Thus, the control'shaftt
the differential gear reducer allows for an overriding
action which permits the device to bemanually positioned
2,9 is journalled independently of the motor sleeve shaft
by thevdial. Indexing means- are also provided for posi
27, a clearance between the shafts 27 and 2.9 being pr0-`
tive positioning ofl the device to bepositioned.
vided. A dial 3G is secured to one endf of the control»
shaft 29 as by a set screw 31 and thedial 30 is provided
The motorized dial> control mechanism of this inven
tion may power position and manually‘position many dif 20 with an indicating portion 32 for indicating therotative~
positions of the control shaft 29.
'
ferent kinds of devices, such> as, for example, electrical
An eccentric 34 is secured tothe end of. the. motor
potentiometers, variable resistances, variable condensers,
sleeve shaft 27 and a rotor 35 is rotatably mounted ony
variable transformers, single and multiple switches, gov
the eccentric. The rotor 35 is provided with teeth 36'
erning..dials in servo-mechanisms, and the like. It is also
particularly useful in controlling the position of a4 tuner 25 which mesh with teeth 37 in an annulus member` 3S-whichj
is rotatably mounted in the cylindrical portion '25 ofy thein a televisionset.
housing member 19. Normally, the annulusmember 38€
Further objects of this; invention reside in the detailsV
is held against rotation, in other words, stationary.' As
of construction of the motorized dialrcontrol mechanism
and in the cooperative relationshipssfbetween Vthe 'compo->
the eccentric 34 is rotated. by the.y motor rotor sleeve shaft
nent parts-thereof.,
30 27, the rotor 35. is oscillated` and, due to the meshing
engagement of- the teeth 36y and 37, it is also rotated:
Other objects and advantages ofv this invention willV be
As for example, the teeth 37 in the annulus member 38
number 45l and the teeth 36; on therotor 35V number 44,"
thereby` providing for al speed reduction, ratio of 44 to l.
The rotor 35 is providedl with .a plurality of holes 4t).`
FIG. l is a verticalsectional view through one form 35
come apparent to those skilled in the art upon reference
to the accompanying specificatiomclaims and drawings in
which:
of- the motorized dial control mechanismv of this invention
and` being taken substantially alongy the line 1-1 of
(i4 suchk holes being shown -for purposes of' illustration)
housing illustrated in FIG. 1;,
the annulusmember 38'I As the eccentric l44` is. rotated,
the rotor 46 is oscillated and'a due to the meshing engage
ment of the teeth 47: andV 48, the rotor. Í46 is A'also ro
which receive pins 41 'of` an intermediate. member 42Í
which is journalled for rotation concentrically withr the.
FIG. 4;
f
axis of the control shaft 29 in the. annulus member~î38g as
FIG.- 2 is. a vertical sectional View taken substantially
40 indicated» at 43. Thus, as therotor'35 is oscillated and
along the line 2-2 of FIG, l;
’
rotated, the intermediate member 42V is correspondingly
FIG. 3 is> a vertical sectional- View taken substantiallyy
along the line 3_-3 of FIG. l;V
rotated at the reduced speed. Theintermediate. member
42.y is provided with >an eccentric `44 uponxwhichv is rotat-r`
FIG. 4. is an;- end elevationalview of the motorized dial
ably mounted a rotor 46. The rotor’46iis provided with
control mechanism. looking from theyrightof FIG. 1;
FIG. 5 isI Va perspective view of the differential» gear 45 teeth 47 which mesh with another ring-"of teeth 48 in
Y FIG,` 6 is a, side elevational viewxof another form of»t
the _motorized dial control mechanism of »this invention;
FIG. 7 is a vertical sectionalv view. taken ,substantiallyV
tated. For example, the teeth 47" on therotor 4.6 num
along the line 7_7, of FIG. 6;
l
50 ber 19» andthe teeth 48» in theiannulus- member 38 num-~
ber 2O.` By reason of these numbers of teeth, there is
FIG. 8 is a vertical sectionalfview,l taken substantially;
along the line ST8v of FIG. 7.;
FIG, 9V is a vertical sectional viewftaken,substantially;
along the line 9_9 of FIG. 8;*and
'
FIG. 1,0 ist- a partial perspective View of FIG. 6. Y
' Referring first to FIGS. l-S, one,Y form of the motorized
dial .controlv mechanism >of this invention is generally
designated at 1_0. It includes. an electric motor '11,- such
asia, 4_-pole reversible electric motor whichV utilizes a con,
.. provided a speed reductionyratio between Vthe .eccentric
4.4» and the rotor 460i L9 to. 1‘. The, two speed reduc~
tion~~et`feets are accumulative so` that vthe 'total'speed re
duction ratio is 44 times 1~9 orl 8~36to lo.' With theßmotor
rotor sleeve shaft rotating at a speed? of‘êlátû()` r.p.m., the.
rotor»46¿would be rotated» at substantially 4; r.p.rìn.>
The rotor 46 isl a-lsofprovided: with a plurality of holes
49 which receive pins 50> carried by anoutput membern
denlser (not shown). for providing operation of the motor` 60 52, `the pins~5tl being provided Ywith -antifriction sleeve`
rollers 51 operating in, the`~ holes 49: The. holesi v49 and
. in one direction. or the opposite direction. The motor 11VY
pins 50 transmit rotary motion from the rotor 46 tothe
includes` a ñeld structure. having laminations 12¿ carrying
output member 52~in the s_arnek way that the holes40; and
coils 13. A bracket 14 is arranged at one‘side ofthe
pins 41 transmit rotary motion from. the: rotor 35 >to the
lamina-tions. 12 andis providedr with ears 15 by which it
is securedto the laminations 12.> The bracket» 14 carries 65 intermediate member. 42. Thexoutput. member 52 is pro-'
vided with` a sleeve` extension 53;` whichis keyed. to the;
a, bearing 1,6. which is heldin place by a plate 1-7. secured '
control` shaft 29 and held in-placef thereon by a 'snap ring
tothe bracket
A housing. member 19»is¿ arranged on
54. Since the shaft 29 is journalledv for rotation in the,
the. other'side. yof the laminationsi 12 and» it is provided f
intermediate member 4Z, Vtheoutput member 52’is also
with years 2,0 for securing the> same to the laminations 12,
The housing member 19 is provided with <a wall 21 in 70 journalled for rotation thereby. The. device. to' be >posi
Whishis arranged a bearing-f2.2.; the bearfillebeins held` in
tioned such> as the> electrical potentiometer, variable 're-‘
Place by erlatelì Securedxtof the housing Wall l2.1,»v The,r
sistance, variable condenser, switch, televisionA tuner, or
3
3,028,513'
4
the like is connected to the extension 53 and, hence, to
eccentric 88 secured thereto upon which is rotatably
the control shaft 29.
Thus, as the motor 11 is operated in one direction or
the other, the output member 53 is' operated at a greatly
reduced speed in said one direction or the other to cor
respondingly position the device to be positioned and to
correspondingly position the dial 30 for indicating the
position of the device being positioned. Since the con
nections between the output member 52 and its associated
rotor 46 and between the intermediate member 42 and
its associated rotor 35 are not rigid connections, trans~
mission of shock loads from the output member 52 to the
electric motor 11 are substantially eliminated. Since the
differential gear reducer is concentric with the rotor sleeve
>shaft and since the control shaft 29 is also concentric
thereto, the motorized dial control mechanism is extreme~
ly compact and simple in construction which would not
be the case if the motive power were applied through a
worm gear type of drive operating at right angles to the
control shaft. The housing member 19 is provided with
a cover member 56 which is held in place thereon as by
crimping as indicated at 57, the cover member 56 oper
ating to maintain the parts of the diñerential gear reducer
mounted a rotor 89.
The rotor 89 has a iirst ring of
teeth 90 which mesh with teeth 91 formed in the annulus
member 86 so that, as the rotor 89 is oscillated by the
eccentric 88, it is also caused to rotate by the meshing
interaction of the teeth 90 and 91. The rotor 89 also is
provided with a ring of teeth 93 which mesh with teeth
94 formed in the output member 9S which is provided
with a cylindrical extension 96, the output member 9S
being rotatably mounted on the motor sleeve shaft' 79.
As the rotor 89 is oscillated and rotated in the manner
described, the meshing of the teeth 93 and 94 also cause`
rotation of the output member 95. For purposes of illus
tration, it is assumed that the teeth 91 are 25 in number,
the teeth 90 are 24 in number, the teeth 93 are 25 in num
ber and the teeth 94 are 26 in number. These various
numbers of teeth operate to provide a speed' reduction
ratio >between the rotor sleeve shaft 71 and the output
member 95 of 624 to l.
20
A coupling member 98 is secured to the control shaft
80 as by a set screw 99 and is splined or keyed as in
dicated at 100 to the cylindrical extension 96 of the out
put member 95. The device to be positioned- may be
in assembled relation.
connected to the motorized dial control mechanism by
As expressed above, the annulus member 38 is normally 25 means indicated at 101 and, hence, it is connected to
held against rotation in the housing member 19 and, to
the output member 95 and to the control shaft 80, the
ward this end, the annulus member 58 is provided with a
dial 82 indicating the position of the device to be po
plurality of circumferentially arranged notches 59 which
sîtioned.
are engaged by a ball 60 arranged within a tube 61 car
As expressed above, the annulus member 86 is nor
ried by the housing member 19. A spring 62 is arranged 30 mally held against rotation and this is accomplished by
within the tube 61 beneath a screw 63 for the purpose of
a spring clutch consisting of a coil spring 102 encom
resiliently urging the ball 60 into the notches 59. The
spring pressed ball 60 cooperating with the notches 59
passing the cylindrical extensions 77 and 87 of the bracket
76 and the annulus member 86. If a force is applied
provide a friction means for normally holding the an
to the «annulus member 86 which has a tendency to wind
nulus member stationary so as to render the differential 35 the spring 102, the annulus member is prevented from
gear reducer eñective for power operating the output
member 52 and, hence, the control shaft 29, as the elec
rotating. However, if the force is inthe opposite direc
tion so as to tend to unwind the spring 102, the an
tric motor 11 is operated in one direction or the other.
If, however, it is desired to manually position the device
being positioned by manually manipulating the knob 30,
the force applied to the control shaft 29 and the output
member 52 is transmitted through the differential gear
40
nulus member 86 is permitted to rotate. Thus, when
the electric motor 71 is operated in a direction to apply
said force in said >iirst mentioned direction, the annulus
member 86 is maintained stationary and the differential
gear reducer operates to power rotate the control shaft
80. When, however, the control shaft 80 is manually
reducer to cause the annulus member 38 to be rotated
Vagainst the action of the friction means. In this way,
manipulated in a direction which causes a force to be
the power operation of the dial control mechanism will 45 applied to the annulus member 86 in said opposite di
vhe manually overriden by manipulating the knob 30 so
rection, the annulus member 86 is permitted to rotate
as to manually position the device to be positioned. The
so that the control shaft 80 may be manually manipu
notches 59 and ball 60 also operate as an indexing means
lated to override the motorized operation of the differ»
for indexing the position of the» annulus 38 and, hence,
ential gear reducer to manually position the device to
the position of the device to be positioned.
50 be positioned.
If it be desired to manually position
the device in either direction, then the spring 102 may
motorized dial control mechanism is generally designated
be formed relatively loose to permit movement of the
lat 70. It includes an electric motor 71 having a ñeld
annulus member 86 in either direction but still tight
structure comprising laminations 72 carrying a coil 73.
enough so that it will hold the annulus member sta
A bracket 74 is secured to one side of the laminations 72 55 tionary for normal loads on the control shaft 80 but
and a bracket 76 having a cylindrical extension 77 is se
allow slippage for abnormal loads as when the control
cured to the other side of the laminations 72.Y A motor
shaft is manually manipulated.
rotor 78 is arranged within the laminations 72 and is car
In order to index the position of the device to be
ried by a hollow sleeve shaft 79 which is rotatably
positioned, the outer periphery of the output member
mounted in the bearing 75 and bracket 76 and sleeve ex 60 95, which is formed of ferrous material, is provided
tension 77. The motor is preferably a reversible elec
with a plurality of circumferentially arranged- bosses
tric motor and operates to rotate the sleeve shaft 79 in
104. A permanent magnet 105 is carried by the bracket
one direction or the opposite direction depending upon
76 adjacent the bosses 104 so as to cause the magnetic
the character of energization of the coil of the electric
attraction of the bosses as the bosses are aligned with
motor.
65 the permanent magnet 105. Thus, the output member
A control shaft 80 is rotatably journalled in the motor
95 is magnetically indexed.
sleeve shaft 79 and a washer 81 is press fit on the control
Here, also, as in the form of the motorized dial con
shaft 80. A dial 82 is secured to the control shaft 80
trol mechanism generally designated at 10, the concen
adjacent the washer 81 as by a set screw 83, the dial 82
tric arrangement of the electric motor, control shaft and
having graduations 84 thereon for indicating the rotative 70 differential gear reducer provides for a compact, sturdy
positions of the control shaft 80.
'
and efficient motorized dial control mechanism and',
An annulus member 86 having a cylindrical extension
generally, the same results are provided by both types
87 is rotatably mounted on the motor sleeve shaft 79 and
of mechanisms 10 and 70.
it is normally held against rotation in a .manner to be
While, for purposes ofillustration, two forms of this
described hereafter. The motor sleeve shaft 79 has an
invention have been described, other forms thereof may
Referring now to FIGS. 6-9, another form of the
3,028,513
6
become apparent to those vskilled in the art upon ref
sleeve shaft rotated thereby, a rotatable control shaft
-extending through‘the sleeve shaft, a dial secured»- to- the
erence-tothis'disclosure and, therefore,"'¿this invention
-should- be limited only kbyïthe` scope‘of the-'appended
-control shaft for .manually rotating thel control'shaft and
claims.
`for indicating the »rotative position thereof, a differential
5 :gear reducer concentrically arranged about the control
il claim -`as -my invention:
lshaft and including an input member-carriedby the sleeve
' l. A motorized dial control mechanism for position
ing a -device `comprising-‘ani electric motor having. va hol
shaft, a reaction member, and an-output membersecured
`to the control shaft and connected tothe device to'be
low'sleeve shaft rotated thereby, a rotatable control-shaft
positioned, and friction means‘associated with the-reaction
`extending throughthe sleevefshaft, a- dial secured to the
`control shaft for manually rotating the control _shaft and 10 Ymember for normally holding the reaction member sta
tionary to allow the electric motor toposition the device
for yindicating the rotative position thereof, a differential
through the differential gear‘reducer and'for permitting
gear reducer concentrically arranged about» the control
the reaction member to rotate whenthe control shaft is
'shaft and including an input member carried bythe
Vforcibly manually rotated by the dial to allow manual posi
sleeve shaft, a reaction member, _andan output mem
ber secured tothe control shaftn and connected to the 15 tioning of the device, saidffriction means including index
'ing means for positive positioning ofthe device to be posi
vdevice to be positioned, and frictionY means associated
-tioned.
with the reaction-member for normallygholding >the re
6. A motorized dial control‘mechanism for positioning
action member stationary to allowtheelectric- motor to
a device comprising, a control shaft connected to the de
position thev device'through thel differential >gear reducer
and for 'permittingt-he Areaction -memberv to rotate when 20 vice to be positioned, a dial secured to the control [shaft
for manually rotating the control-shaft and for- indicating
the controlrshaft isforcibly manually `rotated by the dial
«the rotative position thereof, 'an `'electric motor having a
to allow-manual positioning of the device.
shaft rotated thereby, a differential gear reducer including
2. A motorized dial Vcontrol‘mechanism for> position
an input member operated-by the motor shaft, a reaction
ing a device comprising, a control shaft connected to
the device to be positioned, a ‘dialsecured to the control 25 y'r'.riember, and an output member connected to the control
ïshafty and friction> means associated with the reaction
shaft for manually rotating ‘the control shaft ’andV for
member for normally holding the reaction member sta
indicating the lrotativeposition thereof, an' electric mo
‘tionary »to allow the electric motor to yposition the device
tor having a shaft rotated thereby,V afdifferential` gear
through the'differential »gear reducer and for permitting
tor shaft,~a reaction member,> and »an outputï member 30 the reaction member-to rotate when the controlshaft is
`reducer including aninput member operated'by .the mo
connected tothe ycontrol shaft, and friction means asso
forcibly manually rotated by the dial to allow manual
positioning of the device, said friction' means including
ciated with the reaction member 'for norm'a’lly’holding
indexing means’for positive positioning of the device to -be
the reaction member stationary to allow the electric mo
positioned.
tor to position the device through the differential gear
reducer and for, permitting‘the vreactionmember to ro 35 ` 7.rv A motorizedy dialrcontrol mechanism'` for» positioning
a'- device comprising; an electric motor havingaV`> hollow
tate when the control shaft is forcibly manually rotated
'sleeve shaftvrotatedïthereby,„a rotatablecont'rol shaft
bythe ,di-al to allow manual positioning of thefdevice.
extending> through the sleeve shaftn a~ dial securedto'the
r3. ‘A7, motorized dial control `mechanism for, position
Äcontrolshaft for »manually rotating the control shaft yand
inga device comprising, anele'ctric motor havingA ahol
‘low sleeve shaft rotated'thereby, a rotatable control shaft 40 »for indicating the rotative position thereof, a‘ïdifferential
gear reducer concentrically arranged about the control
extending through the sleeve shaft, a dial secured to the
shaft and including an input member carried by the sleeve y
control shaft for manually rotating the control shaft and
shaft, a reaction member, and an output member secured
for indicating the rotative position thereof, a differential
to the control shaft and connected to the device to be
gear reducer concentrically arranged about the control
positioned, and friction means associated with the reaction
shaft and including an input member carried by the
member for normally holding the reaction member sta
sleeve shaft, a reaction member, and an output member
tionary to allow the electric motor to position the device
secured to the control shaft and connected to the device
through the differential gear reducer and for permitting
to be positioned, and friction means associated with the
the reaction member to rotate when the control shaft is
reaction member for normally holding the reaction mem
forcibly manually rotated by the dial to allow manual
ber stationary to allow the electric motor to position the
positioning of the device, and indexing means associated
device through the differential gear reducer and for per
with the output member of the differential gear reducer
mitting the reaction member to rotate when the control
for positive positioning of the device to be positioned.
shaft is forcibly manually rotated by the `dial to allow
8. A motorized dial control mechanism for positioning
manual positioning of the device, and indexing means
associated with the differential gear reducer for positive 55 a device comprising, a control shaft connected to the de
vice to be positioned, a dial secured to the control shaft
positioning of the device to be positioned.
for
manually rotating the control shaft and for indicating
4. A motorized dial control mechanism for positioning
the
rotative position thereof, an electric motor having a
a device comprising, a control shaft connected to the de
shaft rotated thereby, a differential gear reducer including
vice to be positioned, a dial secured to the control shaft
for manually rotating the control shaft and for indicating 60 an input member operated by the motor shaft, a reaction
member, and an output member connected to the control
the rotative position thereof, an electric motor having a
shaft, and friction means associated with the reaction
shaft rotated thereby, a differential gear reducer including
member for normally holding the reaction member sta
an input member operated by the motor shaft, a reaction
tionary to allow the electric motor to position the device
member, and an output member connected to the control
shaft, and friction means associated with the reaction 65 through the differential gear reducer and for permitting
the reaction member to rotate when the control shaft is
member for normally holding the reaction member sta
forcibly manually rotated by the dial to allow manual
tionary to allow the electric motor to position the device
positioning of the device, and indexing means associated
through the differential gear reducer and for permitting
with the output member of the differential gear reducer
thereaction member to rotate when the control shaft is
forcibly manually rotated by the dial to allow manual 70 for positive positioning of the device to be positioned.
9. A motorized dial control mechanism for positioning
positioning of the device, and indexing means associated
a device comprising, a reversible electric motor having a
with the differential gear reducer for positive positioning
hollow sleeve shaft rotated thereby, a rotatable control
of the device to be positioned.
5. A motorized dial control mechanism for positioning
shaft extending through the sleeve shaft, a dial secured to
a device comprising, an electric motor having a hollow 75 the control shaft for manually rotating the control shaft
3,028,513.
8
and for indicating the rotative position thereof, a differ
ential gear reducer concentrically arranged about the con
trol shaft and including an input member carried by the
`sleeve shaft, a reaction member, and an output member »,
-secured to the Vcontrol shaft and connected to the device
to be positioned, and friction means associated with the
reaction member for normally holding the reaction mem
ber stationary to allow the reversible electric motor to posi
tion the device in one direction or the opposite direction
lthrough the differential gear reducer and for permitting
the reaction member to rotate in one direction or the
a reaction member, and an output member connected tol
the control shaft, and friction means associated with the`
reaction member for normally holding the reaction mem
ber stationary to allow the electric motor to position ’the
.device through the differential gear reducer and for per
Vmitting the reaction member to rotate when the control
shaft is forcibly manually rotated by the dial to allow
manual positioning of the device, and magnetic indexing
means including a permanent magnet associated with the
differential gear reducer for positive positioning of -the
device to be positioned.
»
i
»opposite direction when the control shaft is forcibly manu
12. A motorized dial control mechanism for positioning
.ally rotated by the dial in said one direction or opposite
a device comprising, an electric motor having a hollow
,direction to allow manual positioning of the device.
sleeve shaft rotated thereby, a rotatable control shaft ex~
10. A motorized dial control mechanism for position 15 tending through the sleeve shaft, a dial secured to the
ing a device comprising, a control shaft connected to the
_control shaft for manually rotating the control shaft and
device to be positioned, a dial secured to the control shaft
for indicating the rotative position thereof, a differential
for manually rotating the control shaft and for indicating
gear reducer concentrically arranged about the control
the rotative position thereof, a reversible electric motor
shaft and including an input member carried by the sleeve
having a shaft rotated thereby, a differential gear reducer 20 shaft, a reaction member, and an output member secured
including an input member operated by the motor shaft,
to the control shaft and connected to the device to be
-a reaction member, and an output member connected to
positioned, and friction means associated with the reac
the control shaft, and friction means associated with the
tion member for normally holding the reaction member
reaction member for normally holding the reaction mem
stationary to allow the electric motor to position the
-ber stationary to allow the reversible electric motor to 25 device through the differential gear reducer and for per
>position the device in one direction or the opposite direc
mitting the reaction member to rotate when the control
tion through the differential gear reducer and for permit~
»ting the reaction member to rotate in one direction or the
shaft is forcibly manually rotated by the dial to allow
manual positioning of the device, and magnetic indexing
opposite direction when the control shaft is forcibly
means including a permanent magnet associated with Vthe
manually rotated by the dial in said one direction or 30 differential gear reducer for positive positioning of th
opposite direction to allow manual positioning of the
device.
device to be positioned.
-
`
11. A motorized dial control mechanism for position
References Cited in the file of this patent
ing a device comprising, a control shaft connected to
UNITED STATES PATENTS
the device to be positioned, a dial secured to the control 35
shaft for manually rotating the control shaft and for indi
cating the rotative position thereof, an electric motor
2,063,340
2,151,534
Ruben _______________ __ Dec. 8, 1936
Scofield _____________ __ Mar. 21, 1939
having a shaft rotated thereby, a differential gear reducer
2,170,951
Perry _______________ __ Aug. 29, V1939
including an input member operated by the motor shaft,
2,658,395
Coates _____________ __ Nov. 10, 1953
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