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Патент USA US2409897

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Oct. 2z, 194e.
» G. H. PHELPS
2,409,895
ELECTRICAL P’OSITIONING SYSTEM
Fí-l'ed Feb. 5, 1943
2 Sheets-Sheet 1
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Oct. 22, 1946.
G, H_ PH'ELPS
2,409,895
ELECTRICAL PQSITIONING SYSTEM
Filed Feb. -5, 1945
2 sheets-sheet 2
ATTORNEY
Patented Oct. 22, 1946
2,409,895
UNITEDy vSTATES PATENT >OFFICE t
_
2,409,895
ELECTRICAL POSITIONING SYSTEM
George H. Phelps,> Catonsville, Md., assignor to
Westinghouse Electric Corporation, East VPitts
burgh, Pa., a corporation of Pennsylvania
Application February 5, 1943, Serial No. 474,829
6 Claims.
1
(Cl. 172-239)
.
This invention relates to electrical positioning
e 2
systems and, more particularly, to a selective con
trol of circuit elements from a remote point.
wherein each position represents equal angular
displacements over the path described by the arc
of rotation. This is accomplished by the addition
Positioning systems of the type to which this
invention particularly relates include a motor
mits further rotation of the motor after the de
of a cam switch driven by the motor which per
drive rotatable in both directions which is cou
sired positioning has ybeen established. »
pled to the driven element in such manner that
Another advantage of the'positioning system
the movement of the latter can be set to various
herein described is _that the usual clutch between
predetermined positions. In these systems, it is
the motor and the driven element can be elimi
essential that the driven element should be ac 10 nated by utilizing a novel drive inthe form of a
curately positioned along a circular path to any
Maltese-cross gear, so that the accuracyY of the
preselected position, by rotation vin either clock
setting is determined thereby.
wise or counterclockwise direction. Control sys
A particular feature of the invention resides in
tems heretofore used generally employ a. split disc
an extremely compact v mechanical assembly
in cooperation with the driving motor which ro
whichI is easily adapted to effect the positioning
tates simultaneously with the i driven element.
of any number of selector switches accurately to
There is also a suitable electricalor mechanical
clutch mechanism to disengage the motor when
any preselected stop.
with the contacts so that when any one of the
ated element no actuating motor may start under
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Another feature of the invention, as will be
the driven element reaches the‘selected position.
seen when considering its mechanical details, re
On the split disc are placed a number of contacts, 20 sides in the drive mechanism for the vMaltese
each defining one selectedA position ofthe driven
cross gear which maintains a rigid contact posi
element. The insulating space which separates
tion for the selector «switches driven thereby.
the two halves forms the dividing line between
A marked advantage ofthe system herein de
the ltwo directions of rotation of the motor. The
scribed is its freedom fromtemperature varia
free space between the two segments cooperates
tionsin that prior tor the movement of the actu
contacts through which a circuit is completed to
no-load condition and may run for a definite time
the `motor reaches this space it will open the» cir
freely. In this manner operation is secured when
cuit.
f
temperature> conditions adversely affect the motor
When a split disc is used the rotation in each 30 speedandpower. v»
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direction is confined to 180°. If rotation 4beyond'
. Other features and advantages will be apparent
that is desired up to nearly 360° each half of the
from the following description of the invention,
split disc may be replaced by individual contact
pointed out in particularity by the appended
discs carrying contact segments which make .a
claims, and taken in connection with the accom
complete revolution for each direction of rota 35. panying drawings, in which: -.
tion.
Figs.A 1, 2-and 3 show three views of the com
While this type of remote control has been
pact driving mechanism-as a unit which can be
widely used, it has the disadvantage that for very
attached to any desired number of selector
accurate positioning avery accurate and small
switches; Fig. 4 shows` a .schematic circuit ar
clearance must exist between the two halves .of 40 rangementv for thefcontrol of the positioning
thesplit disc segments. The slightest momen
mechanism in combination, by way of example,
tum of the turning‘disc augmented by the mo
with the tuning mechanism of a radio receiver
mentum of the motor may cause overriding,
to-a number of preselected frequencies.
whereby upon contact with the other segment a
Referring to the drawings, in the views’of Figs.
reversal of the motor is effected. This condition 45. 1, 2 and» 3, the driving motor I is shown to be
creates hunting or oscillating around the desired
mounted in a frame 2„the motor having a shaft
point. Moreover, the accuracy ofvpositioning is
3 carrying a worm 4. The latter drives the worm
limited by the Width of the insulating space be
gear 5, the shaft 6 of which runs transverse to
tween the discs which in practice has to be .wide
the frame 2 in bearings ‘I and 8. Secured to
enough to prevent hunting, and thereby allows 50 the shaft 6 and driven thereby is the lock wheel
appreciable differences in the actual stopping po->
9» carrying the pin I 0 .for driving the Maltese
sition.
cross wheel I2. On the other'y side of the gear 5,
'I’he present invention overcomes these disad
the shaft 6 carries the cam I3, the surfaceY of
vantages when such systems are used for the _po
which engages the movable member I4 of the
sitioning of switches or other circuit components, 56 hold-_lover switch I 5. 'I'he Maltese-cross wheel I2
2,409,895
4
drives the shaft I1 at one end, and at the other
motor I.
This source may be either alternating
end it rotates the circuit control switch I8 and
or direct current.
The motor is of the dual*
iield type, having iields 23 and 24. One terminal
of each iield connects to one side of the incoming
I5. The shaft I1 protrudes sufficiently to permit
coupling thereto the selector switches which the Ul supply line in series with the armature or rotor
which contacts brushes 25 and 2E. The other
device is intended to position. In other words,
terminal of field 23 connects through lead 21 to
to the shaft I1 is connected the driven element
the rider 28 of the circuit control switch I8 en
of the positioning system.
gaging the segment 22, and also through lead
The mechanical features should be observed in
29 to the upper contact of the hold-over switch
these figures for a clearer understanding of the
I5. Similarly, the other terminal of field 24
system when considering the operation thereof
.connects through lead 30 to the rider 3| which
in connection with the various electrical controls.
engages segment 22' of the circuit control switch
It is seen, taking particularly Figs. 2 and 3 into
I8, and also to the lower contact of the hold-over
consideration, that as the motor shaft 3 revolves
switch I5. Displaced around the switch I9 are
the lock wheel 9 is turned by the worm gear 5. >
the contacts 32, 33 and 3d, equidistantly placed
The lock wheel 9 carries the locking member II
corresponding to the number of steps which the
which engages the corresponding peripheral face
positioning system is to make in its intended
of segment IB, of the Maltese-cross wheel I2..
As long as the member II engages the surface
operation. Connected in parallel with the above
of the segment I6, the Maltese-cross wheel I?. is 20 mentioned contacts are the contacts 35, 36 and 31
of the connecting switch 29, the rider of which is
locked in position. At every revolution oi the
connected through lead 38 to the moving contact
lock wheel 9, the pin I0 engages the slot I9 be~
tween the segments IB and will drive the wheel
I4 of .the hold-over switch I5. The contacts 39,
I2 one segment in either direction depending
40 and 4I of the manual selector switch 42 con
upon the direction of rotation oi the wheel 9. 25 nect also to contacts 32, 33 and 34, respectively.
The manual selector switch 42 may be placed
When the pin Hl engages the slot I9, the cutout
portion of the member II unlocks the wheel I2,
at any desired location and completes the current
permitting movement thereof. It is to be noted
path to the source in that its rider 43 is con
that once the pin I0 leaves the slot I9, the wheel
nected to the terminal B of the supply.
9 is free to rotate Without affecting the firm 30
The radio receiver shown here comprises a
position of the Maltese-cross I2. In this manner,
simple ampliiier and detector circuit tunable by
as will be explained later, the -motor may continue
means of the iiXed condensers 41, 48 and 49 in
its rotation over a comparatively long segment
the ampli-lier stage and the fixed condensers 50,
in the circular -path of the pin I0, and may be
5I and 52 in the detector stage. Each of these
the connecting switch 20 for the hold-over switch
stopped anywhere along this segment without 35 condensers is indicated to be variable for a par
interfering with the succeeding positioning of
ticular setting to tune the receiver to a desired
the Maltese-cross I2. This is an important fea
station. Selector switch ‘53 connects any one of
ture and instrumental in the »absolute accuracy
of each step in the positioning of the shaft I1.
the condensers 41, 48 or 49 to the grid `55 of
and the various mechanical elements are spaced
far apart, and particularly the shaft I1 >is shown
extended. Coupled to the shaft is shown, by
way of example, a set of rotary switches for the
bearing on the invention herein described and
need not be considered in detail. Suffice it to
say that when switches 53 and 54 connect cor
the Vacuum tube `56, tuning thereby the grid
Referring now to the operation of the system 40 circuit comprising the secondary 51 oi the radio
and observing the circuit shown in Fig. A4, it is
frequency input transformer 58. Similarly, the
seen that the important mechanical elements
selector >switch 54 connects any one of the con
are shown in vperspective and the electrical cir
densers 5I), `5I or 52 in shunt with the secondary
cuit is schematically represented. For the pur
59 of the coupling transformer 60. The various
pose of clear illustration, the control switches 45 circuit elements of the radio receiver have no
remote actuation of the tuning of a radio re
ceiver. The electrical positioning device in ac
responding contacts, the radio receiver is tuned
50 to receive a selected station.
Describing the operation, let us assume that
cordance with this invention is well adapted for
the entire system is at rest. It is seen that fol
use in connection with radio receivers, and for
lowing the circuit from the A terminal, the motor
this reason it was chosen to illustrate its opera
iields 23 or 24 are not energized, since the con
tion in connection with a radio receiving system. 55 nection to the field is broken in that neither
It is to be understood and can readily be seen
switch I8 nor switch I5 is closed to the contacts
that, in place of the tuning arrangement of the
selected by switch 42. Thus the center contact
radio receiver, other types of rotary switches
40 of the >switch 42 was chosen as the desired
may be actuated for a variety of purposes, such
position when the system was last operated. Fol
as selecting different electrical circuits. While 60 lowing the connection to the center contact 33
there are only two switches shown, any number
of the switch I8, We see that the circuit is broken
may be employed as long as they are to be ac
by the insulation between the segments 22 and
tuated simultaneously. The switches may also
22’. Furthermore cam I3 is in such position
have any number of contacts provided that the
that the moving contact I4 of the switch I5 is
Maltese-cross wheel segments are accordingly 65 between the upper and the lower contacts.
proportioned and the size of the circuit control
Let us now turn the manual selector switch
switch I8 allows the placement of the number
42 to the position whereby its rider 43 engages
of riding contacts desired side-by-side along the
the contact 4I. Following the circuit from the
two operating segments 22 and 22’ respectively.
B terminal, we see that the current will flow
To avoid unnecessary complication of the circuit, 70 through the contact 34 of the switch I8 and
there are only three contacts shown, sufficient it
finds a path along the segment 22’ to the con
is believed for a `thorough understanding of the
tact 3| and through lead 39 to the field 24 and
through the motor to the terminal A. It should
operation of the system.
be noted also that the rider of the switch 2D does
The terminals A and B indicate the con
nection to a source of power for driving the 75 not engage the contact 31, so that the moving
2,409,895
5
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arm I4 of the switch I5, is not connected to the
current source.4 The purpose of the switch 20 will
be better understood when the` operation ofthe
system becomes clear and will be explained here
after in greater detail'.
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We have seen that the field 24 become'fen
e'rgized, when the switch 42 was moved to en
the lower contact toi break the circuit to the
motor.
Considering now- the operation of the switch
2li, it will be seen thatit is intended to control
the‘connection'of the arm I4 of the hold-over
switch I5 to the supply circuit in such manner
thatwhen the manual selector switch 42 is placed
ergize contact 4I. The connections of the motor
to any desired contact for the next ensuing op
eration, connection `to the arm I4 of the hold
energized, the motor will turn the worm 4 so as 10 4over switch I5 is broken until the shaft I1 is
to rotate the worm-gear 5 in the proper direction
moved tothe selected position. Then contact
whereby the Maltese-cross wheel I2 moves the
of the hold-over switch arm I4 is again estab
shaft I1 so that the contact 34 of the circuit
lished through the new setting of the switch 20.
control switch lI8 shall be placed between the
I claim as my invention:
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Y
segments 22 and 22’. In accordance with the 15
1. In an electrical positioning system, switch
operation in the manner chosen it is seen that
ingA means adapted to be positioned in deñnite
the rotation of the worm gear 5 must be counter
' steps over a series of contacts, a motor for driv
clockwise as indicated by the arrow,` since move
ing said means, an energizing >circuit for said
ñelds are so -made that when the ñeld 24 is
ment of the drive pin I I) in this direction will
motor including a current source and a circuit
rotate the Maltese-cross wheel I2 in a clockwise 20 control »switch in series therewith operated in
direction. It should be noted here that as the
conjunction with the positioning of said means,
worm gear 5 rotates and the pin IIJ approaches
'said circuit control switch determining also the
the Maltese-cross wheel I2, the cam I3 will lift
direction offrotation of said motor, a selector
the moving arm I4 of the switch I5 so that it
switch adapted to be placed at a remote point
engages the upper contact thereof. However, this 25 for selecting at will the -positioning of said
in no way inñuences the rotation of the motor I
switching means to any one of the number of
in the direction indicated in that, as can be seen
said series of contacts, said selector switch com
in tracing the circuit, the field 23 is not connected
pleting the energizing circuit through said con
to the source, because the circuit through con
trol switch to said motor and a hold-over switch
tact I4 and upper contact I5 is broken at con 30 maintaining said energizing circuit closed until
tact arm 20 of the switch 20 and also at contact
the positioning of said switching means is fully
39 of the switch 42. As the drive pin I 0 moves
completed and after said control switch reaches
the Maltese-cross wheel I.2 one step and shaft
its open circuit position.
I1 is turned thereby, the switch I8 will be moved
2. In an electrical positioning system, switching
so that the segment 22’ no longer engages the 35 means adapted to be positioned in deñnite steps
Contact 34. The latter` will be now in the same
‘over a series of contacts, a motor for driving said
position as .the contact 33 was previously, that
means, an energizing circuit for said motor in
is, the circuit therethrough will be broken. At
cluding a current source and a circuit control
the same time, the switch 2D will engage con-A
switch in series therewith operated in conjunction
tact 31. rI'he switches 53 and 54 are now also 40 with the positioning of _said means, said circuit
positioned so that condensers 41 and 50 are
control switch determining also the direction of
placed across the respective circuits of ythe re
rotation of said motor, a selector switch adapted
ceiver. The instant when this occurs the drive
to be placed at a remote point for selecting at
pin IU will be just ready to leave the slot, and
will the positioning of said switching means to
the motor would stop since the contact 34 is not 45 any one of the number of said series of con
in engagement with the segment 22', and the
tacts, said selector switch completing the ener
circuit is broken between contacts 34 and 3|.
gizing circuit through said control switch to said
However, the operation' of the hold-over switch
motor and a hold-over switch operated by a cam
I3 assures continued rotation of the motor and
driven by said motor for maintaining said ener
also, of course, of the pin Il) of the lock wheel 50 gizing circuit closed until the positioning of said
9. The reason for this is that the cam I3 will
switching means is fully completed and after
now oiîer the smaller diameter of its contours
said control switch reaches its open circuit posi
to the moving arm I4 of the hold-over switch
tion.
I5, so that the lower Contact thereof is in en
3. In an electrical positioning system, switch
gagement. In tracing the circuit, we see that 55 ing means adapted to be rotatably positioned in
the current starting from the terminal B will
definite angular steps over a series of contacts,
iiow through contact 4I of the switch 42, contact
a reversible motor for driving said means, an
31 of the switch 20, through lead 38 and the
energizing circuit for said motor including a cur
lower contacts of the hold-over switch I5 through
rent source and a circuit control switch in series
the iield 24. The rotation will continue until 00 therewith operated in conjunction with the rota
the cam I3 reaches the original starting position
tion of said means, said circuit control switch
shown, whereby the arm I4 of the hold-over
determining also the direction of rotation of said
switch I5 is again in the mid-position between
motor, a selector switch adapted to be placed
the upper and lower contacts. Whatever mo
at a remote point for selecting at will the posi
mentum the motor may have had, including the 65 tioning of said switching means to engage any
momentum of the worm gear '5 and lock wheel 9
one of the number of said series of contacts, said
which would tend to continue rotation of the
selector switch in series with said control switch
motor even after the arm I4 of. the hold-over
completing the energizing circuit to said motor,
switch I5 breaks the circuit, will not affect the
and a hold-over switch operated by a cam driven
accuracy of the setting of the driven elements 70 by said motor for maintaining said energizing
in that the Maltese-cross wheel stays in locked
circuit closed until the rotation of said switching
position over a substantial travel of the drive
means is fully completed to the selected contact
pin I0. The stopping surface 44 of the cam I3
and after said control switch reaches its open
circuit position.
has sufficient length to allow for the movement
4. In an electrical positioning system, switch
due to momentum when the arm I4 is lifted from 75
2,409,895
ing means adapted to be rotatably positioned in
deñnite equidistant steps over a series of con
tacts, va reversible motor for driving said means,
an energizing circuit `for said motor including a
current source and a "circuit control switch in
series Vtherewith operated in conjunction lwith
the rotation of said means, said circuit control
switch Ydetermining also the direction of rota
tion of said motor, a selector switch adapted
to be placed at a remote point for selecting at
will the positioning of said switching means to
any one of the number of said series of contacts,
said selector switch completing the energizing
circuit in series with said Icontrol switch to said
motor and a hold-over switch `in `shunt with said
control switch for maintaining said energizing
circuit closed until the positioning of said switch
means is fully completed and after said control
switch reaches its open circuit position.
5. In an electrical positioning system, driving
means comprising a reversible motor, driven
means, a drive «between said motor and said‘
driven means including `means for positioning
said driven means to a fixed step of `angular
displacement for each complete revolution of said .
drive in either direction, an electrical control
circuit for said motor includinglmeans for de
termining the direction oi' rotation of said driven
means and -for selecting a particular step of dis
placement .thereof, and control `means for com
pleting the revolution of said drive to substan
tially the same stopping point after said driven
means vis positioned to a selected step.
6. In an electrical positioning system, driving
means comprising a reversible motor,
driven
means, `a drive between said motor and said
driven means including a Maltese-cross coupling
for positioning said driven means to a fixed step
of 'angular displacement for each complete revo
lution of said drive in either direction, an elec
trical control circuit for said motor including
switching means actuated by said driven means
for determining the direction of rotation of said
driven means and for selecting a particular step
of displacement thereof, and control means for
said motor for completing the revolution of said
drive to substantially the same stopping point
after said driven means is positioned to a selected
step.
GEORGE H. PHELPS.
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