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Патент USA US2403552

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July 9, 1946.
F. Q, RAST
2,403,552
CLOCK
Filed Jan. 1, 1943
6 Sheets-Sheet lv
74
‘PIC-3.1.‘.
75 1'93
69
44
W¢
.
. ATTORNEY
July $9 3%46.
F. Q. RAST
24%,552
CLOCK
Filed Jan. 1, 1945
_
6 Sheets-Sheet 3
74a
50a
BY
A TTORNE Y
July 9, 1946.
F. C). RAST
2,403,552
CLOCK
Filed Jan. 1, 1945
6 Sheets-Sheet 5
746
A TTORNE Y
Patented July 9, 1946
2,403,552
UNITED STATES PATENT OFFICE
2,403,552
CLOCK
Frederick Q. East, Binghamton, N. Y., assignor to
International Business Machines Corporation,
New York, N. Y., a corporation of New York
Application January 1, 1943, Serial No. 471,037
16 Claims. (Cl. 58—24)
2
My invention relates to time keeping apparatus
and more particularly to- clocks and clock systems;
for example, a clock system wherein one or more
secondary clocks which are operated during
normal operating periods at their regular time
rates, are periodically regulated to correct, if
necessary, their respective time settings in accord
time indicating member from a driving motor
at the regular time rate during normal operating
periods and to operate the time indicating mem
her from the same motor at a greatly accelerated
time rate during synchronizing periods.
Other objects of the invention will be pointed
out in the following description and claims and
ance with a selected standard time setting such,
illustrated in the accompanying drawings, which
for example, as a master clock continuously oper—
disclose, by way of example, the principle of the
ated at the correct time rate.
10 invention and the best mode, which has been
An object of the invention is to provide appa
contemplated, of applying that principle.
In the drawings:
ratus of the above type which is of improved
construction and arrangement of parts, and one
Fig. 1 is a fragmentary vertical section showing
which is simple in its construction and which is
one preferred form of secondary clock constructed
reliable and effective in its operation.
15 in accordance with the present invention, the
In accordance with one aspect of the present
plane of the section being indicated by the line
invention, I provide apparatus of the above type
of Fig. 2, and the View showing the relative
positions of the parts at the end of a synchroniz
comprising a time indicating element such as a
ing period;
minutes indicating member; a driving motor, such
for example as a synchronous motor operated at 20
Fig. 2 is a fragmentary end elevation of the
a regular time rate from a commercial alternating
clock shown in Fig. 1;
Fig. 3 is an enlarged fragmentary vertical sec
current power line; and a motion-transmitting
mechanism connecting the motor with the
tion taken on the line 3-3 of Fig. 1;
Fig. 4 is an enlarged fragmentary plan sec
minutes ‘member. rI‘he apparatus also comprises
a control means which causes the motor to drive 25 tion taken on the line 4—4 of Fig. 1.
the minutes member through the motion trans
Fig. 5 is a fragmentary sectional’ view in the
mitting mechanism at its normal or regular rate
same plane as Fig. 1 and showing the relation
during normal operating periods of ?xed and rela
of the parts at the beginning of a synchronizing
tively long durations, for example, from the be
ginning of each hour to the ?fty-ninth minute,
and which also causes the motor to drive the
minutes member through the mechanism at a
greatly accelerated rate during a. synchronizing
period occurring between successive normal oper
ating periods, and until the minutes member
occupies a preselected time position, for example,
period;
Fig. 6 is a view like Fig. 5 and showing the
relation of the parts during a normal operating
period.
Fig. '7 is a wiring diagram illustrating how a
plurality of secondary clocks like the one of
Figs. 1 to 6, inclusive, may be connected for oper
ation by a source of alternating current and how
the operation of the secondary clocks may be
the zero or sixtieth minute position which is the
position the member should occupy at the begin
controlled by a master clock;
ning of the next normal operating period. The
Fig. 8 is a fragmentary sectional view like Fig. 1‘
control means operates to stop the minutes mem 40 and showing a modi?ed form of secondary clock
ber upon reaching this preselected time position,
constructed in accordance with the present inven
and releases the minutes member at the begin
tion;
ning of the next normal operating period, so that
Fig. 91s a fragmentary end elevation like Fig. 2
and showing the same clock as Fig. 8;
the setting of the minutes member will be correct
at the beginning of each normal operating period.
Fig. 10 is a fragmentary vertical section taken
A further object of my invention is to provide
on the line l(l—-I0 of Fig. 8;
'
a new and improved clock for use in systems of
Fig. 11 is an enlarged fragmentary plan section
the type referred to above, which clock comprises
on the line I I-—-l I of Fig. 8;
a novel means for periodically correcting the time
Fig. 12 is a wiring diagram showing an alter
setting thereof in accordance with a selected
native way of controlling the operation of a plu
standard time setting.
rality'of secondary clocks by a master clock;
A still further object is to provide a clock of
Fig. 13 is a fragmentary sectional view like
the above type including new and improved mo
Figs. 1 and 8 and illustrating another modi?ed
tion transmitting mechanism which is controlled
form of secondary clock constructed in accord
by a signal responsive means to operate the 55 ance with the present invention;
2,403,552
3
4
Fig. 14 is a fragmentary end view like Figs.
gear 38 is so proportioned to the number of
2 and 9 and illustrating the modi?cation of
Fig. 13;
Fig. 15 is an enlarged fragmentary plan sec
tion taken on the line [5-15 of Fig. 13;
Fig. 16 is a fragmentary detail sectional view
showing more clearly the relationship of certain
of the parts ‘shown in Figs. 13, 14, and 15;‘ and
Fig. 17 is a wiring diagram illustrating how a
teeth on the gear 39 that with the sun gear 39
held stationary and the planet arm 34 rotated
for one complete revolution, the sun gear 38 and
the minutes sleeve 25 will be advanced one
sixtieth of a revolution. In the construction
shown, the normally stationary sun gear 39 is
provided with ?fty-nine teeth and the sun gear
"
38~which is ?xed to the minutes sleeve is pro
10 vided with sixty teeth. Thus, for each rotation
plurality of secondary clocks like the one shown
in Figs. 13 to 16, inclusive, may be controlled by‘
a master clock.
of the planet arm the sun gear 38 is advanced
one tooth, or one sixtieth of a revolution. It
Referring now in detail to the construction
will be of interest to note that during normal
illustrated and ?rst to Figs. 1 to 6 inclusive, the
operating periods, the rate and direction of rota
reference numeral ill indicates, in‘ its‘enti-rety.
»tion of the pinion 35 about its own axis are con
one preferred form of secondary clock'cone
trolled by-th'e stationary sun gear 39 and by the
structed in accordance with the‘ present inven~
rate and direction of rotation of the planet arm.
tion. The clock I0 comprises the customary
Fixed to the end of the sleeve to which is
face plate ll, back support plate [2 and‘ an in
opposite‘the sun gear 39, is a relatively large
termediate support plate I 3 suitably secured 20 diameter circular disk 42 having teeth 43 cut
together in ?xed parallel relation by the usual
on its outer periphery. During. normal operat
pillars M. A self-starting synchronous motor
ing periods a tooth-like projection Mon the
I5 is supported by the back plate i2 and is driven '
at a substantially uniform time rate from ‘the
outer end of an arm 45 of a lever 46 engages
between two of the teeth 43 on the periphery of
available alternating current light and‘ power 25 the disk 42 and thereby holds the disk 42, sleeve
line.
The synchronous motor includes a shaft
40 and sun gear 39 against rotation.
The lever
l8" extending through an opening in the back
plate and to the outer end of the shaft I6 is
flxed‘a small driving pinion or gear IT.
46 is rotatably supported by a fulcrum shaft 41
which is in turn supported by the plates I2 and
I3, and the projection 44 is held in‘ looking en
The motor I5 drives a seconds arbor or shaft 301 gagement with the disk 42 by a tension spring 48
20 by means of'lthe‘gear i1 meshing with a large
connected at one end to the lower end of the
spur gear 21 which is fixed to a collar 22 keyed
t0 the shaft 20. The gears I1 and 2| are of
such a size with respect to the speed of the
motor shaft l6, that they drive‘the seconds shaft
arm 45 and its other end‘ to the lower end of an
arm 49 of an operating lever 50 also journalled on
the shaft 41.
Summarizing the foregoing, it is noted that
with the synchronous motor operated from the
available commercial alternating current sup
ply at its designed‘ regular‘time'rate, the seconds
20 at the normal or regular time rate of one
revolution per minute. The usual seconds hand
24 is ?xed to the outer‘end of the shaft 20' (see
Fig. 3). The seconds shaft is rotatably sup
shaft 20 will be rotated at the rate of one revo
ported at its inner end by the back support plate
l2 and is also rotatably supported by a minutes
lution per minute; and, with the ?fty-nine tooth
sun‘ gear 39 ‘held stationary, the minutes sleeve
sleeve 25 journaled on said shaft and in turn
25 will be‘rotated at the rate of one sixtieth of a
supported for rotary movement about its axis
and the axis'of the shaft 2il,‘by the‘intermediate
support .plate l3 and by the hoursleeve 26, the
latter being in turn supported by the face plate
H: The minutes hand 21 is fixed to the outer
end of the sleeve 25 and the hour hand 28‘to the
outer end of the sleeve 26. The hours sleeve ‘26
is driven from the minutes sleeve through the
conventional gear train composed: of gears 29,
30, 3| and 32.
In accordance’with the present invention, I
provide a planetary gear system for driving the
minutes sleeve 25 during normal operating pe
riods at the‘ regular time‘ rate with respect to the
seconds shaft 20. The gear system comprises a
planet arm 34 ?xed to the collar 22‘ and thereby
rotating about the axis of the seconds shaft at
revolution per minute through the planetary gear
system, and the hour sleeve 26 will be driven from
the minutes sleeve at the regular time rate
through the train of reduction gears 29, 30, 3|,
and 32, respectively. Ordinarily, the secondary
clock l0 operates at‘the correct time rate due
to‘ the controlled frequency of the commercial
alternatingi'current supply. As is well known,
however, it is necessary’ to provide for periodi
cally correcting the time settings of secondary
clocks, because of occasional stoppage of the cur
rent supply or ‘due to possible excess friction in
the motion transmitting mechanism of one or
more of the secondary clocks, or due to other
causes well known to those‘skilled in ‘this art.
According to this invention, provision is made
for operating the secondary clock at the above—
the same rate as said shaft. The planet arm 60' described regular rate during each normal oper
34 carries at its outer end a planet pinion 35
ating period which, in the embodiment disclosed,
rotatably mounted upon a sleeve 36 which is in
extends for the greater part of each hour; for
turn journalled on a'stud 31 fixed to the ‘arm
example,- from‘ the beginning of‘each hour until
34. The planetary gear system also comprises
?fty-nine minutes past the hour. Also, provi
a pair of sun gears 38 and 39, respectively, which
sion is made for operating the clock at a greatly
are mounted for rotation about the same axis
as'the arm 34 and are both in mesh with the
planet pinion. The sun gear 38 ‘is ?xed to the
inner end of the minutes sleeve 25 ‘and the other
sun gear 39 ‘is ?xed to one end of a sleeve 40
rotatably mounted on the minutes sleeve 25. As
will appear presently, the sun gear. 39 is held
stationary during normal operating periods.
The sun gears 38 and” have the same pitch
diameter and the number of teeth on the sun
accelerated rate during synchronizing periods of
relatively short duration, for the purpose of cor
recting for any loss in time. The synchronizing
periods occur between successive normal oper
ating periods and in the example disclosed the
synchronizing period is the one minute interval
between the ?fty-ninth minute and the sixtieth
minute or zero time‘ position. Theclock starts
operating at the fast rate at the beginning of the
‘ sixtieth minute ‘and continues until the minutes
2,403,552
5
6
and seconds indicating members reach a prese
lected position indicating the end of the sixtieth
tated 3%) of a revolution. 3%0 of a revolution of ‘
the thirty-six tooth pinion 35 is equivalent to 21.6
teeth on such pinion. Therefore, for each revo
lution of the arm 34 the sun gear 38 is rotated an
amount equal to 21.6 teeth in a counterclockwise
stopped and held stationary. At the beginning of
direction; but, as the planet arm has been ro
the next hour the two time indicating members
tated clockwise one complete revolution, the re~
are released by a time signal from a master clock,
sultant movement of the sixty tooth sun gear 38
thus starting the secondary clock off at the cor
will be sixty teeth clockwise minus 21.6 teeth
rect time.
‘
In the construction shown in Figs. 1 to 6, in- 10 counterclockwise or 38.4 teeth clockwise. This
equals 38%0 of a revolution for each revolution of
elusive, the minutes sleeve 25 and hand 21 of the
the planet arm. As the sun gear 38 only rotates
secondary clock [5 operate at a greatly acceler
one tooth or %0 of a revolution for each revolution
ated rate during synchronizing periods due to the
of the planet arm during normal operating pe
releasing of the ?fty-nine tooth sun gear 39 and
by controlling the rotation of the planet pinion 15 riods, it follows that the sun gear 35 will be driven
38.4 times as fast during synchronizing periods.
35 about its rotary axis. The sun gear 39 is re
This greatly accelerated rate of rotation during
leased by moving the lever arm 45 clockwise. to
the one minute synchronizing period makes pos
disengage the tooth-like projection 44 from the
sible the maximum advancement of 38.4 minutes
periphery of the disk 42 in a manner which will
be presently described. The planet pinion 35 is 20 of the minute sleeve 25. This is considered ample
for any ordinary condition that might arise. If
controlled in its rotation about its rotary axis
a greater time correction is required, it can be
during synchronizing periods due to its friction
effected during succeeding synchronizing periods.
al driving connection with a relatively large gear
It will be appreciated, of course, that a greater or
55 which meshes with a second and relatively
small gear 55 coaxially mounted with the sun 25 lesser amount of correction in a given synchro
nizing period can ‘be easily provided by varying
gears 38 and 39 and held stationary during each
the relative sizes of the gears 55 and 55.
synchronizing period.
The lever 46 is moved in directions to effect
The gear 55 is ?xed to the sleeve 36 and is fric
locking and releasing of the two disks 42 and 6|
tionally connected to the side of the pinion 35
by a spider-like spring member 5‘! engaging the 30 due to the operative engagement of a pin 56 on
the downwardly extending arm-49 of the operat
side of the pinion and urging the latter toward
ing lever 55, with a third arm 61 on the lever lit‘.
the gear 55, and by a disk of suitable friction ma
The operating lever 53 also includes an upstand
terial 58 positioned between the pinion and gear
ing arm 68 having a vertical slot 69 ‘formed there—
to assure frictional engagement of the parts.
The gear 55 which is held stationary during syn 35 in and receiving a pin 10 carried by the lower end
of a lever arm 'H. The arm ‘H is secured inter
chronizing periods is ?xed to a sleeve 50 jour
mediate its ends by a pin 12 to the armature 13
naled on the outer cylindrical surfaces of the
of a solenoid T4 and the upper end of the arm "H
sleeve 49. A circular disk 6| of substantially the
is pivoted to a pin 15 on a fixed supporting ele
same diameter as the disk 42 is ?xed to the sleeve
60 and is also provided on its periphery with 40 ment 16 carried by the solenoid 14. As will pres
ently appear, the solenoid 74 is energized by the
teeth 62 which are adapted to be engaged and
?ow of direct current thereto under the control
held stationary during synchronizing periods by
of a master clock, at the beginning of each syn
a tooth-like projection 63 carried on the outer
chronizing period and is deenergized under the
end of a second arm 64 of the lever 46.
The lever 46 is rocked counterclockwise, in a 45 control of such master clock at the end of the
synchronizing period. When the solenoid is en
manner which will be presently explained, at the
minute or the beginning of the next hour. At
this point the minutes and seconds members are
ergized, at the beginning of each synchronizing
beginning of a normal operating period to effect
period, the armature 13 moves to the right as
locking engagement of the projection 44 and disk
viewed in Fig. 1 and moves with it the arm ‘H
42 and to effect disengagement of the projection
63 and disk 5!, and the lever 45 is rocked clock 50 which in turn moves the operating lever 58 clock
wise about the fulcrum shaft 41 to effect operative
wise at the beginning of a synchronizing period
engagement of the pin 66 and arm 6'! and thereby
to effect disengagement of the projection 44 and
rock the lever 46 clockwise to disengage the disk
disk 42 and engagement of the projection 63 and
disk 6!. Thus, during normal operating periods,
the sun gear 39 is held against rotation and the
gear 56 freely rotates with the pinion 35 under
the control of the stationary sun gear; and, dur
ing synchronizing periods, the gear 56 is held
against rotation to control rotation of the pinion
about its axis and the sun gear 39 is permitted
to freely rotate.
In the construction shown, the planet pinion
42 and engage the disk 5! in the manner pre
viously explained. When the solenoid is deener
gized at the end of the synchronizing period, a
tension spring 1'! connected at one end to the
lower end of arm 49 and at its other end to a
?xed stud 78, moves the lever 5!] counterclockwise
and the armature 13 to the left, as viewed in Fig.
1 and thus permits the spring 48 to move the lever
46 counterclockwise to lock the disk 42 and dis
engage the disk 6|. _
35 has thirty~six teeth. The gear 55 which is
As stated above, I also provide a means which
frictionally connected with the planet pinion has
65 acts during ‘synchronizing periods to stop the
sixty teeth, and the gear 56 which meshes with
minutes sleeve When it reaches a preselected time
the gear 55 and is held stationary during syn-,
position corresponding to the beginning of the
chronizing periods, has thirty-six teeth. Thus,
next normal operating period and for holding the
during synchronizing periods with the arm 34
sleeve
in this position until the beginning of the
rotated at the speed of the second shaft and with
the sun gear 39 released, for each revolution of 70 next succeeding normal operating period when
the arm 34,v thirty-six teeth of the gear 55 will
mesh with the gear 56. Consequently, the gear
55 is rotated 3%) of a revolution in a clockwise
direction; and, as the gear 55 and pinion 35 are
frictionally connected, the pinion 35 is also ro 75
it is released so that it can operate at its regular
or normal time rate as before. As stated, this
preselected time position is preferably the zero
or sixtieth minute position. In the construction
shown, this stop means comprises a relatively
2,403,552.;
large‘circular disk 88 which is. ?xed to a sleeve
81 in turn ?xed to the minutes sleeve.25 so that.
it will rotate with.the minutes‘sleeve, and the,
disk ‘88 isprovided on its periphery with? a single
notch 82 adapted to be engaged. by a .tooth-like ,
reachesa'position
projection 83 one. lever
correspondingto
arm 84 whenthe
theposition.
disk .88
8.
74 of the=clocks I8 may be controlled by a master
clock. operating at the correct [time rate, so as to
determineithe.v time of ‘beginning. and. ending of
the normal operating periods and the synchroniz
. ing periods.
The contacts 95 and 96 are apart
of the master clock :of .any suitable construction
known to those skilled in the. clock art, and are
operated so that the contacts 95 open and the con
the sleeve 25 and hand 21 should correctly. oc-,
cupy at the sixtieth minute. The lever arm 84
tacts 95 close at the end of each synchronizing
is also i'ulcrumed on the shaft 41 and‘is held out -10 period, which is also the beginning of the succeed
of ‘engagement with the disk 88 during normal
ing normal operating period, and so that the con
operating periods when the solenoid ,is deener
gized, by means of the pin. 66 on the. operating
lever 58; As stated ‘before, at the beginningof
the synchronizing period. the. solenoid
ener 15
gized to move the operating lever and ‘pin clock
Wise to release the disk 42 and stop the disk“.
The clockwise movement of the'pin 56 permits the .1
lever arm 84 also to be moved clockwise by a
tension spring 85 connecting the ends of arm 49 20
and arm“, and thereby to effect engagement of .
the projection 83 with the periphery of the disk
88. Figure 6 shows the-pin 58 engaging, the un
derside of the lever arm 84 and holding the pro
jection 83 out of engagement with the disk 88,
which is the position occupied‘ during normal,
operating periods. Figure 5 shows the position
of the parts during a synchronizing period when
tacts~95~close and the contacts SGIopen- at the
endoi each normal operatingperiod- which is also
the beginning of the succeeding . synchronizing
period.‘ As statedpreviously, in. the embodiment
disclosed. the normal ‘operating periods are‘se
lected to begin on the hour-and continue .until
?fty-nineminutes past thehour, and the syn
chronizing periods begin at ?fty-nine minutes
:past theihour. andend on the hour or at each
sixty minute or zero position of the clock I8.
Thus, the contacts 95iwill be opened and the con
tacts 96 .closed by the master clock at the begin
ningof each hour and the contacts 95 will be
closed and the contacts 96‘ opened at fifty-nine
minutes past each. hour.
In the diagram, 91 indicates a suitable trans
formerv having its primary connected to the usual
the arm 84 has been released so that it is in en
commercial alternating ‘currentpower and light
gagement with the rim of the disk 88-and before
.line indicated by the terminals 98 and 99. At the
it has entered the notch 82 to stop the disk‘ 88
heginninCr of each normal operating period with
and the minutes sleeve 25. Figure 1 shows the
the contacts
closed, ACcurrent will flow from
projection 83 in the notch 82 ‘which isthe posi
the secondary I88through the wire I8I, wire I82,
tion of the parts when. the minutes sleeve 25 and
disk 88 arelin the preselected sixty minute posi 35 contacts 86, wire 183,-wire I84, and wires I85 con
nected in parallel, to the several motors I5; and,
tion.
from‘
the motors I5, through‘ condensers I86, and.
The aforementioned stop means- also prefer»
wires
I81, I88 and I89, back to the secondary I88.
ably, includes a means for stopping the seconds
The impedance of the coils of the solenoids ‘I4.
shaft 28, after the minutes sleeve has been stopped >
is high enough so that the A. C. current flow just’
in the manner just described, at the zero or sixty; 40. described will not effect the armatures ofv these
second position of the seconds hand, so that the
solenoids. As the contacts 95¢are open during
seconds hand as well as the minutes hand will
the ?fty-nine minute normal operating periods,
start off at the correct time setting at the begin
current will not flow-from the secondary I I8.
ning of the next normal operatingiperiod. To
At the beginningqof. and during each synchro
this end, the lever armv 84 is rigidly connected by» i nizing period with the contacts 95 closed and the
an integral plate 86 with an arm 81 carrying a pin ~
contacts 69'open, and vA. C. current will flow as
88 which fits within a horizontal slot 89 in an arm .
before
fromone side of-the secondary. I88 ‘and
98 also fulcrumed on the shaft 41. A' tension
through
theiwire I DI and wire I 82, but, as the con
spring 9i connecting upstanding arms 92.~and,93
on the lever arms 88 and 81, respectively, con 50 tacts 85 are open, the A. C. current will flow
through the-wire III and ‘condenser ll2'instead,
stantly urges the arms 92 and 93 in a direction
where the pin 88 normally engages the upper edge‘
of the slot 89.
The arm 98 is provided with a.
downwardly extending tooth-like projection ; 94‘
which when the‘projection B3 enters'the notch 82.:
is moved into the path of the upper-end of.the
planet arm 34 and will stop the same and the sec
onds shaft 28, at the zero or sixty second posi
andtwill then‘ flow as before through the wires
I84 and .I85A‘to the ,motors I5 and back through
the wires I81, I88, and I89 to the other‘side of
the secondary I88. Withthe'contacts 95 closed,
the two input terminals lI3‘and I I4 of-a conven
tional full-wave. dry-plate recti?er Il5 are con
nected acrossthesecondary. I IU-by the wire IIG‘
and‘by the Wire I I1 and ‘contacts 95. A DC. cur
tion, which is the position of the parts just de
rent will then flow. from one output terminal II8
scribed‘ in
l, 2, 3 and 4. The construction is
such that when- the projection 83.is down and 60 oi the recti?er through a wire I I9,'wire I84, wires
I85 connected in parallel to the coils of the sole
in engagement with the rim‘ of thedisk “and
noids 74; and the D. C. current will flow from the
before it enters the notch 82 like inFig. 5, the
projection 94 is out‘of the path of the planet arm
solenoids 14 through the wires I81, wires I88 and
34 so that the latter is free-to rotate until the pro 65 I89, secondary I88,‘ wire I8I, and wire I28, to the
jection 83 enters the notch 82 to hold the ‘minutes
other output terminal I2I of the rectifier II5.
member 25 at the sixty- minute position.
From theabove it is apparent that I have pro
In Figure 7 of the drawings-there is shown a
vided a simple and novel two wire system for
wiring diagram which illustrates one preferred.
operating one or. more secondary clocks I8 from
manner of supplying a commercial alternating
, the customary outlet of‘ the usual lighting current.
current to the-motors I5 ofa plurality of secondary‘
The D. C. current for energizing the solenoids is
clocks like the clock ;I 8 of Figures 1 to 6, inclusive,
superimposedon the A; C. current operating the
for the purpose of operating the clocks at .the. desecondary clock motors. The condenser‘ I I2 and
sired regular; time rate, and which. also illustrates ‘
wire I I I provide-a path‘forithe A: C. current with
how- the flow of adirect current;to the solenoids
out shorting therecti?er .I I5 during synchronizing.
2,403,552
9
.
10
periods, and the condensers I06 prevent the flow
of the D. C. current through the motors [5.
lever 50a, including an arm 49a having a pin 66a
In Figs. 8 to 11, inclusive, I have shown a mod
i?ed form of secondary clock Illa constructed
in accordance with the present invention. The
clock Ilia is similar in me my respects to the clock
In disclosed in Figs. 1 to 6, inclusive. As will
presently appear, the principal difference be
tween the construction of clocks Illa and I0 is in
when the arm 49a is moved clockwise to engage
extending from both sides thereof and operable
a second arm 61a on the lever 46a and to move
the arm 45a clockwise against the force of a
spring 480i for the purpose of disengaging the
locking projection 44a from the teeth 53a of disk
42a; and the pin 66a being also operable when
the lever 50a is moved counterclockwise to engage
the provision for controlling the operation of the 10 the underside of lever arm 84a and move the lat
ter counterclockwise against the force of a spring
planet pinion during synchronizing periods to
850: to disengage the projection 83a from the
drive the minute sleeve at the greatly accelerated
notch 82a.
~
rate.
As in the previous modi?cation, the operating
Like the previous modi?cation, the clock loa
comprises a faceplate Ila, intermediate support 15 lever 50a includes an upward extending arm 68a
having a vertical slot 69a formed therein and
plate Ilia,‘ and back plate I20. suitably secured
receiving a pin 16a carried by the lower end of
together in ?xed spaced relation, and a syn
an arm Ha which is pivoted at its upper end to
chronous motor [5a carried by the back plate
a ?xed pivot pin 15a and is connected interme
Ma and driving through spur gears Ila and Ma,
and sleeve 22a, a seconds arbor or shaft 20a. The 20 diate its ends to the armature 73a of a solenoid
‘Me.
inner end of the seconds shaft is journaled in the
As before, the solenoid 14a is energized at the
back plate 12a and is supported by a minutes
beginning of a synchronizing period and is de
sleeve 25a journaled on the outer surface of the
energized at the end of such period. When the
shaft 20a and by an hours sleeve 26a journaled
solenoid is energized, the armature 13a is moved
on the minutes sleeve 25a and in turn rotatably to the right as viewed in Fig. 8 thereby moving
supported within an opening in the face plate
the operating lever 58a clockwise to effect the
Ha. The intermediate portions of the minutes
releasing of the disk 42a and minutes sleeve 25a
sleeve 25c are journaled within the bore of a
and to permit the spring 85a to move the arm
spacing collar “*5 ?xed within an opening in the
30 84a clockwise so that the projection 83a engages
intermediate support plate 13a.
the rim of the disk 80a and ?ts within the notch
Also, like the previous modi?cation, a planet
arm 343a is ?xed to the collar 22a and gear 2m
82a when the disk 80a occupies the zero or sixty
minute position. Also, when the solenoid is de
and rotates therewith at the speed of the seconds
energized the tension spring Tia moves the op
shaft 28a. The planet arm carries on its outer
end, a planet pinion 35a rotatably mounted upon 35 erating arm 49o counterclockwise to effect opera
tive engagement of the pin 56a with the arm 84a
a ?xed stud 31a. and. meshing with two sun gears
to release the disk 80a and to permit the spring
38a and 39a having the same pitch diameters
48a to move the arm 45a counterclockwise to en
and also coaxially mounted for rotation about
gage and thereby lock the disk 42a against rota
the axis of the seconds shaft 2M. As before, the
sun gear 38a is provided with sixty teeth and is 4 0 tion.
At the end of synchronizing periodse and dur
?xed to the inner end of the minutes sleeve 25a
ing normal operating periods, when the solenoid
and the sun gea~ 39a is provided with ?fty-nine
is deenergized and the disk 42a and ?fty-nine
teeth and is ?xed to the inner end of a sleeve
tooth sun gear 39a is thereby locked, movement
453a journaled on the minutes sleeve 25a. .Se
of the planet arm about its axis at the speed of
cured to the other end of the sleeve 40a is a large
the seconds shaft results in advancing the sixty
disk 42a having teeth 43a formed on its periph
tooth sun gear 38a and minutes sleeve 25a at
ery and adapted to "be engaged and held station
the rate of one tooth or 1/60 of a revolution for
ary by a locking projection Mo on the lower end
each revolution of the planet arm.
of an arm 45a of a lever Eta rotatably mounted
According to this modi?ed form of the inven
upon a fulcrum shaft 41a which is in turn sup 50
ported by the plates {2a and I3a.
tion, during synchronizing periods when the sol
Fixed to the minutes sleeve 2541 through a col
lar 85a is a disk BIJa having a single notch 82a
enoid is energized to release the sun gear 39a, the
in its outer periphery adapted to be engaged by
sun gear 380: and minutes sleeve 25a are advanced
at the same speed as the seconds shaft due to a
a tooth like projection 83g on the outer end of 55 frictional connection between the planet pinion
and the ?xed stud on which it rotates. This fric
a lever arm 84a also rotatably supported by the
tional connection is provided by means of a spi
fulcrum shaft 470.. As in the previous modi?ca
der-like spring element £30 engaging the side of
tion, the notch 82a is so located with respect to
the tooth~like projection 83a that when the lat
the planet pinion 35a and forcing the same
ter enters the notch the minutes sleeve 25a is in 60 against a disk of friction material l3! located be
tween the pinion and the side of the arm 340..
the zero or sixty minute position, which is the
This frictional connection offers a constant re
position the sleeve should occupy at the begin
sistance to the rotation of the pinion about its
axis; but such resistance is not enough to inter
86a is a second lever arm 81a journaled on the 65 fere with the normal rotation of the pinion, un
der the control of the stationary sun gear and the
shaft lilo. and having a pin-and-slot connection
ning of each normal operating period.
Fixed to the lever arm 815a by an integral plate
with a lever Silo also fulcrumed on said shaft
rotating planet arm, during normal operating
Ma and having a stop projection Me which, when
periods. However, when the sun gear is released
in the manner previously explained, the friction~
and the projection 83a has entered the notch 70 al connection is enough to hold the pinion
against rotation about its axis; and, as a, conse
82a, is in the path of the planet arm 34a and stops
the arms 84a. 81a and 96a are rocked clockwise
the latter and seconds shaft Z?a at the zero or
quence, the arm 34a will drive the sun gear 38a
sixty second position.
through the stationary pinion 35a, at the same
The lever arm 45a of lever 46a and the arm
speed as the arm 34a. Thus, the rotation of the
84a are adapted to be operated by an operating 75 planet pinion is controlled by the frictional con
2,403,552
"1 1
-
nection during ‘synchronizing periods so as to ef
feet a one-to-one driving connection‘between the
arm 34a and sleeve 25a in the‘ manner just de
scribed. This frictional connection takes the
place of the gears 55 and 56 and sleeve 50 and
disk 6| of the previously'described. modification.
In Fig. 12 of the drawings, I have shown a di
agram illustrating an alternative way of operat
‘ing one or more secondary clocks of the type
shown in either of the previously described mod“ 10
i?cations, and in controlling the operation of
the. clocks in accordance with the timed opera
tion of a master clock. In the diagram, the ref
erence character I33 indicates the primary or a
I transformer I34 which may be connected to the
usual alternating current supply.
Alternating
current will ?ow from one side of the secondary
12
carrying the. pin 6% which coasts with the arms
Ill?) and 84b to effect locking and unlocking of
the disks EI b and' 42b and to effect engagement
and disengagement of the projection 8321 with the
disk 83b all in the same manner and for the same
purpose as corresponding parts of the previously
described modi?cation of Figs. 1 to 6, inclusive.
In addition to the arm 49b, the lever 50b also
includes an arm I15 having a longitudinal ex
tending slot I75 formed therein and receiving the
outer end of a stud or pin I'I'I carried by the lower
end of a lever I‘Ill (see also Fig. 16). The lever
H3 is pivoted at its upper end on a fixed fulcrum
stud Ill; carried by the intermediate support
plate I 3%) and is provided intermer
its end;
with an outwardly projecting follower pin it?)
operable to engage and be moved by the multiple
I35 ‘of the transformer through the wire IE5, wire
lobe
[S2 journaled
cam Isl. on
The
thecam
fulcrum
[BI isshaft
?xed41b‘
to and
a sleethe
I31, and wires I38 connected in parallel, to the
respective motors I5 or I5a, of the secondary 20 cam comprises a plurality of similar lobes I333
clocks depending upon which form of clock is
which are equally spaced circumferentially from
used; and, from the motors the current will ?ow
one another to provide similar recesses I 24 there
through wires I39, wire I40, wire MI, and wire
,between and are formed on their respective peaks
‘I42 back to the other side of the secondary I355.
with similar dwell portions I05. ‘A ratchet wheel
‘ The contacts I43 are a part of a master clock of
I86 is also fixed to the sleeve I82 and is open
any suitable construction and are intended to be
closed at ?fty-nine minutes past each hour to
initiate the synchronizing period and to be
ated by a pawl I8? pivoted on the pin ‘10b which
' carried by the lower end of lever arm 'IIb.
Like
in the previous modi?cations, the arm ‘III; is
' opened at the sixty minute or zero position to
pivoted at its upper end ‘to a ?xed pin 75?) and
end the synchronizing period and initiate the 30 is connected intermediate its ends to a pin 72b
next normal operating period. When the con
carried by the outer end of the armature 13
tacts I43 are closed, current will ?ow from the
of the solenoid 141). A tension spring I90 con
secondary I35 through wire I36 and wire I44 to
nects the lower end of the arm ‘IIb and a ?xed
" the input side of a half-Wave dry-plate recti?er
stud 'ISI carried by the plate I3?) and functions
“ I45 of suitable construction, and from the output '
when the solenoid 14b is deenergized to move the
side of the recti?er through wire I46, contacts
arm lib and pawl I81 to the left as shown in
‘I43, wire I41, and wires I48 connected in paral
'
lel to the coils of the solenoids ‘I4 or 14a, as the
case may be.
The return sides of the solenoids
are connected by the wires I39, wire I40, wire ML
and wire I42 to the other‘ side of the secondary
I35. As will be apparent to those skilled in this
art, current ?owing from the recti?er I45 is di—
‘ rect current, and flows as a series of impulses or
waves.
A condenser I49 in a wire I50 connect
ing the wires I42 and I4‘! is provided for smooth~
ing‘out the D. C. current flow and thereby ren
dering the same more constant. This construc
tion and operation of a half~wave recti?er com
bined with a condenser is of course well known to
‘those skilled in this art and requires no further
explanation.
Fig. 13 for the purpose of indexing the ratchet
wheel I85 and cam IIiI in a countercloclnvise
direction. A non-return pawl I 32 is pivoted on
40 the stud Ill) and is held in engagement with
the‘ ratchet wheel I86 by a tension spring I93
connecting the pawl I92 and stud IQI .
As will be apparent from the foregoing, the
pawl‘ It"! is 'moved to the right
viewed in
45‘ Fig. 13 by the arm lib and armature “I321 when
‘the solenoid 74b is energized, and is moved to
the left by the spring I01} when‘ the solenoid is
deenergized. The length of movement of the pawl
I8‘! is such as to advance the ratchet wheel
counterclockwise one tooth each time the solenoid
is deenergized. In‘ the construction shown the
‘ ratchet is provided with twenty-four teeth and
In the modi?ed form of secondary clock IDb
shown in Figs. 13, 14, 15 and 16, and in the cir
cuit diagram in Fig. 17, I have disclosed an al
ternative construction of the operating lever 50b
‘ and an alternative means for moving the oper
ating lever in response to two separate signals
received from the master clock and being of two
the cam I 6| with twelve lobes’ I 53. Thus. each
time the ratchet wheel I85 is advanced one
tooth the cam I8I is moved counterclockwise one
half the distance between ‘radial center lines oi‘
adjacent lobes I83. The cam is so positioned with
‘respect to the ratchet that at the end of each
stroke in an advancing direction of the pawl I37,
seconds duration each instead of the one con
dwell
00 the pin I80 will be midway of either
portion I85 or midway of a recess portion I84.
When the cam IilI moves the pin I80 from u
recess I84 to a high dwell point I85 the lever I10
‘ 50b and the structure and operation of the mech
is moved clockwise and thereby also moving
anism, to be described, for moving the lever 50b 65 through the pin III the operating lever 56?) in
in response to the two signals, the structure and
a clockwise direction. When the cam I80 moves
I operation of each of the other elements of the
so that the pin ISI will occupy a recess I84, the
clock 10?) is identically the same as the corre
arm IE8 is moved counterclockwise under the
sponding parts in the modi?cation shown in
control of the cam. The force for moving the
tinuous signal of one minute duration disclosed
"in the two previously described modi?cations.
Other than the structure of the operating lever
‘ Figs. 1 to 6, inclusive.
Consequently, I will not‘
" repeat herein the description of these other ele
ments of the clock Illb except as is required to
understand the construction and operation of the
' elements which have been modi?edv
The operating lever 50b‘ comprises the arm 4%
m arm
counterclockwise is supplied by the spring
lb and acts through the operating lever 5th
and pin Ill, as will be apparent.
As set forth in the description of Figs. 1 to 6.
inclusive, clockwise movement of the operating
lever 50?) results in ‘the pin 66b moving the
2,403,552
13
14
lever 46b clockwise to release the disk 42b and
pose of smoothing out or making more uniform
lock the disk Bib, and in permitting the spring
the 1,). 0. current.
8512 to move the lever 84b into engagement with
the disk 80b so as to stop the latter in the sixty
minute position when the projection 83b enters
the notch 82?), and to move the arm 9% down into
the path of the planet arm 3417 when the projec
tion 83b enters the notch 82?), for the purpose
of stopping the seconds shaft in the sixty second
position. Also, counterclockwise movement of
the lever 50b results in the pin 60b moving the
arms 84b and Bill) to release the disk Blib and the
planet arm 34b, and results in the spring Mil)
moving the lever 43b counterclockwise to lock the
disk 42b and release the disk ?lb.
According to the modi?ed construction of
FrOm the foregoing, it is apparent that the
solenoid 141)‘ will be energized for a two-second
duration beginning at ?fty-eight minutes and
?fty-eight seconds past each hour and ending at
?fty-nine minutes past each hour, and will be
again energized for a'two second duration be
ginning at ?fty-nine minutes and ?fty-eight sec
onds past each hour and ending at the zero or
sixty minute position. As the contacts 252 are
open, when the contacts 203 are closed which is
during these two two-second intervals when the
solenoids 14b are energized, no A. C. current will
?ow to the motors [51) during such intervals.
This, however, will not materially affect the op~
eration of the motors as the normal inertia of
the moving parts will be enough to keep the mo“
a recess I84 during normal operating periods and
tors in motion during these two short intervals.
engages a high dwell point I85 during synchroniz
In Figs. 13, 14 and 15 the parts are shown in
ing periods. In Fig. 17, I have shown a wiring 20
the positions which they occupy when the sole~
diagram illustrating how the motors I51) of the
noid 14b‘ is being energizezd for the two second
clocks Iilb are operated by an A. C. current from
duration between ?fty-nine minutes and ?fty
the usual power and light line and how the opera
eight seconds after each hour and the sixty min
tion of the clocks is controlled by a master clock
ute or zero position. The armature 13b is shown
operating at the correct time rate. In the dia
retracted and the pawl I81 in its right-hand posi
gram, the contacts 20%), 20L 2232, and 233 are a
tion as viewed in Fig. 13. The pin I30 on the
part of a master clock of any well known con
lever I18 is shown as being in engagement with
struction and are operated so that the contacts
a high dwell point I85 on the cam IBI. This is
200 are closed at the sixty minute (60') position
of each hour and are opened at ?fty-eight minutes BI" the position it occupies during each synchroniz
ing period. When the solenoid 14b is deeper
and forty seconds (58' 40") past each hour, the
gized, by the opening of contacts 203, and also
contacts 20I are closed at ?fty-eight minutes
contacts 20I, at the sixty minute position, the
and forty seconds (58’ 40") past each hour and
spring I90 will move the pawl I81 to the left and
are opened at the sixty minute (60') position, the
contacts 202 are opened at each ?fty-eight second 35 index the ratchet I86 and cam I8I to permit the
pin I89 to be moved into the next depressed por
(58”) position and are closed at each sixty secon'l
tion I84 which also permits the arm I18 and
(60") position, and so that the contacts 2% are
operating lever 50b to be moved counterclock
closed at each ?fty-eight second (58”) position
wise by the spring 111), to lock the disk 42b and
and are opened at each sixty second (60") posi~
release the disk Elb and to move the arms 04b
tion.
and 90b‘ counterclockwise to release the disk 8%
The ‘primary 204 of the transformer 205 is
and the planet arm 34b. The secondary clocks
adapted to be connected to any convenient source
I0b will then operate at their normal rate until
of alternating current. When the contacts 2553
the solenoid 1141)‘ is again energized and then de
are closed, A. C. current will flow from a mid~
energized at ?fty-nine minutes past the hour to
point 206 of the secondary 201 through a wire
index the ratchet I86 and cam IBI so as to move
208, the contacts 200, wire 209 and the wires 2m
the arm I18 and operating level Eilb clockwise
connected in parallel, to the motors 5b of the
which is the position they occupy during each.
secondary clock; and will flow from the motors
Figs. 13, 14, 15, and 16, the pin IP35) occupies
through wires ZI I, wire 2I2, and wire 213, back
to the secondary 201. Thus the motors I517 will
be operated by A. C. current through the closed
synchronizing period.
are both closed, a D. C. current will ?ow from the
2I8, contacts 20I, wire 2I9, contacts 203, wire
220, wire 209, wires 2I0, to the solenoids 14b and
driving connection with the minutes member and
the other of which is held stationary during such
normal operating periods, the combination of
means operable during a synchronizing period
from the solenoids through the wires 2 I I, a wire
2I2, and wire 2I3 back to the secondary Sill.
A wire 22I with a condenser 222 therein, connects
the wire 2I9 and the secondary 201 for the pur
periods for correcting for loss of time and said
means including means for releasing the other
of said sungears, means for rotating said pinion
While there‘have been shown and described and
pointed out the fundamental novel features of
the invention as applied to a plurality of modi?
contacts 200 from the beginning of each normal
cations, it will be understood that various omis
operating period until ?fty-eight minutes and
sions and substitutions and changes in the form
forty seconds past each hour when the contacts
and details of the device illustrated and in its
200 open. As the contacts 202 remain closed
operation may be made by those skilled in the art.
from the beginning of each minute until ?fty
without departing from the spirit of the inven
eight seconds past each minute, A. C. current will
tion. It is the intention, therefore, to be limited
also flow to the motors during the ?fty-eight
only as indicated by the scope of the following
seconds beginning with the ?fty-ninth minute.
The path of the current flow will be from the 60 claims.
What is claimed is:
secondary 201 through the wire 2%, wire 2M,
1. In a clock of the type wherein the minutes
closed contacts 202 and wire 2I5, to the wire 209,
member is driven at its regular time rate dur
and from there through the motors IEb back to
ing normal operating periods by means of a
the secondary 201, as before. vA half-wave recti
?er 2I6 is connected to the secondary 201 by a 65 rotating planet arm and a planet pinion rotatably
mounted thereon and geared to a pair of co
wire 2I1, and when the contacts 20I and 203
output side of the recti?er 2I6 through a wire
axially mounted sun gears one of which has a
occurring between successive normal operating
12,403,552
.15
16
.in the same direction-as during normal operating
periods, but at a de?nitely slower rate whereby
.members'upon reaching a vpredetermined time
position and operable to release said minutes and
seconds members at the beginning of the next
succeeding normal operating period.
4. Time keeping apparatus comprising a
rotatable minutes indicating member; mechan
said one sun gear is rotated at a greatly acceler
ated rate, and means for determining the amount
‘said minutes member is advanced during such
synchronizing period.
2. Time keeping apparatus comprising a
rotatable time indicating, member; mechanism
operating at a predetermined de?nite time rate
materially greater. than the normal time rate for
said member; a‘planetary gear system connecting
said mechanism and said member for rotating
the‘latter at the proper ‘time rate during normal
operating periods and comprising a planet arm
operatively connected to saidmechanism for‘ro 15
tation about a .?xed axis, a planet pinion
rotatably mounted on‘ said arm and movable
therewith along a prescribed orbit, and ?rst and
second sun gears mounted, respectively, to rotate
about said ?xed axis and geared to said pinion,
ism including a planetary gear system for
rotating said member at its normal time rate and
comprising a planet arm rotatable about a ?xed
axis at the rate of one revolution per minute, a
planet pinion rotatably mounted on said arm and
movable therewith along a prescribed orbit, ?rst
and second sun gears rotatably mounted about
said ?xed axis and geared to said pinion, said
?rst gear having a driving connection with said
'minutes member, the number of teeth on said
?rst and second gears being so proportioned that
with said second gear held stationary said ?rst
gear is advanced at a rate proper to rotate said
20 member at its normal time rate; signal means
determining a synchronizing period of relatively
said ?rst sun gear having. a driving connection
short duration occurring at regular time inter
with said member, the number of teeth on said
?rst and second sun gears being so proportioned
vals between successive normal operating pe
that with said second gear held stationary, said
riods; means for holding said second gear
?rst‘gear is advanced at a rate proper to rotate 25 stationary during normal operating periods
and for releasing said second gear during
said member at its normal time rate; signal
means determining a synchronizing period ‘of
synchronizing periods; means for controlling the
relatively short duration ‘occurring at regular
rotation of said planet pinion to cause said arm
time intervals between successive normal operat
to drive said ?rst gear at a greatly accelerated
ing periods; means for holding said‘second gear 30 rate during synchronizing periods; and stop
means operable in response to said signal means
stationary during normal operating periods and
and during said synchronizing period for stopping
for releasing said second gear during synchron
said arm and said minutes member upon
izing periods; means for controllingthe rotation
reaching a predetermined time position and
of said planet pinion to cause said arm to drive
operable to release said arm and said member at
said ‘?rst sun gear at a greatly accelerated rate
during synchronizing periods; and stop means
the beginning of the next succeeding operating
operable in response to said signal means and
period.
during said synchronizing ‘period for stopping
5. Time keeping apparatus comprising a time
indicating member; mechanism for rotating said
said member upon reaching a predetermined time
position and operable to release saidmember at
the beginning of . the next succeeding normal
operating period.
3. Time keeping apparatus comprising a
rotatable seconds indicating member; a rotatable
minutes indicating member; mechanism for
rotating said seconds member at its normal time
rate; a planetary gear system connecting said
mechanism and said minutes member for rotating
the latter at its normal time rate during normal
operating periods and comprising a planet arm '
operatively connected to said mechanism for
rotation about a ?xed axis, a planetpinion ro
tatably mounted on said arm and movable there
with along a prescribed orbit, and ?rst and
second sun gears mounted, respectively, to rotate
about said ?xed axis and geared to said pinion,
said ?rst sun gear having a driving connection
with said minutes member, the number of teeth
on said ?rst and second sun gears being so
proportioned that with said second gear held
stationary, said ?rst gear is advanced at a rate
proper to rotate said minutes member at its
normal time ‘rate; signal means determining a
synchronizing period of relatively short duration
occurring at regular time intervals between suc
cessive normal operating periods; means for
holding said second sun gear stationary during
normal operating periods and for releasing said
second gear during synchronizing periods; means
for controlling the rotation of said planet pinion
to cause said arm to drive said ?rst sun gear at
a greatly accelerated ‘rate during synchronizing
periods; and stop means operable in response to
said signal means and during said synchronizing
period‘ for stoppingsaid minutes and seconds
member at the normal time rate during normal
operating periodsand comprising a planet arm
rotated .about a ?xed axis at a de?nite time rate
materially greater than the normal time rate for
said member, a planet pinion rotatably mounted
r' on said arm and movable therewith along a pre
scribed orbit, ?rst and second sun gears mounted
for rotation about said ?xed axis and geared to
said pinion, said ?rst gear having a driving
connection with said member, said second gear
being held stationary during normal operating
periods, the number of teeth on said ?rst and
second gears being so proportioned that the ?rst
gear is advanced by said arm and pinion during
normal operating, periods at a rate proper to
rotate said member at its normal time rate; and
means operable duringr a synchronizing period
occurring between successive normal operating
periods to correct for loss of time and to start
said time indicating member off at the correct
time at the beginning of the nextnormal oper
ating period and said means comprising means
for releasing said second gear, means for
rotating said pinion in the same direction as
during a normal operating period but at a mate
rially slower rate, and means for stopping said
time indicating member upon reaching a pre
determined time position and for releasing such
member at the beginning of the next normal
operating period.
6. Time keeping apparatus comprising a
seconds indicating member; means for rotating
said member at its normal time rate; a planet
arm connected to said member and rotatable
therewith about the axis of movement of said
member and at ‘the same rate; a planet pinion
2,403,552
17.
18
rotatably mounted on the outer end of said arm
and movable therewith along a prescribed orbit;
a rotary minutes member coaxially mounted with
respect to said secondsimember; a ?rst sun gear
?xed to said minutes member and rotatable about
its axis and meshing with said pinion; a second
sun'gear coaxially mounted with said ?rst gear
and also meshing with said pinion and being held
rotatably mounted on said arm and movable
therewith along a prescribed orbit, and ?rst and
second sun gears mounted, respectively, to rotate
about said ?xed axis and geared tosaid pinion,
said ?rst sun gear having a driving connection
with said member, the number of teeth on said
?rst and second sun gears being so proportioned
that with said second gear held stationary, said
stationary during normal operating periods; the
?rst gear is advanced at a rate proper to rotate
number of teeth on said two sun gears bearing 10 said member at its normal time rate; signal
such a relation thatwith said secondgear held
means determining a synchronizing period of
stationary said ?rst gear is rotated one sixtieth
relatively short duration occurring at regular‘
of a revolution for each revolution ‘of said arm;
time intervals between successive normal operat
and means operable during a synchronizing
ing periods and including means for sending a
period,‘ occurring between successive normal 15 ?rst signal to initiate said synchronizing period
operating periods to correct for loss of time and
and for sending a second signal to terminate such
comprising means for releasing said second sun
period; means responsive to said ?rst signal to
gear and for controlling the rotation of said
release said second gear to permit free rotation '
pinion, to cause said ?rst gear to rotate at a
thereof and responsive to said second signal for
greatly accelerated rate, and means‘for stopping 20 locking said second gear against rotation; means
said arm and said minutes member upon
for controlling rotation of said planet pinion to
reaching apredetermined time position and for
cause said arm to drive said ?rst sun gear at a
releasing such arm and minutes member at the
beginning of the next. succeeding normal
greatly accelerated rate during said synchron
izing period; and stop means responsive to said
25 ?rst signal for stopping said time indicating
operating period.
'7. Time . keeping
;
apparatus
comprising
a
member upon reaching a predetermined time
rotatable time indicating member; mechanism
operating at a de?nitev time rate materially
position and responsive to said second signal for
releasing said member.
greater than the normal time rate for said mem
9. A clock comprising a rotatable time indi
ber; aplanetary gear system connecting said 30 cating member; a motor constructed to operate
mechanism and said, member for rotating the
at a uniform time rate; a planet arm operatively
latter at its normal time rate during normal
connected to said motor and supported for
operating periods ‘and comprising a planet arm
rotation thereby about a ?xed axis and at a time
operatively connected to said mechanism for
rate materially faster than the normal operating
rotation about a ?xed axis, a planet pinion rotat 85 rate for said member; a planet pinion rotatably
ably; mounted on said arm and movable there
mounted on said arm and movable therewith
with ( along a prescribed orbit, and ?rst and
through a prescribed orbit; a pair of sun gears
mounted for rotation about the same axis as said
about said ?xed axis and geared to said pinion,
arm and geared to said pinion; one of said sun
said ?rst sun gear having a driving connection 40 gears having a driving connection with said time
with said member, the number of teethon said
indicating member and the number of teeth on
?rst and. second sunlgears beingso proportioned
said one sun gear being so proportioned to the
that with saidsecond gear held stationary, said
number of teeth on the other of said sun gears
second sun gears mounted, respectively, to rotate
?rst gear is advanced at av rate proper- to rotate
said member at its normal time rate; a third gear
mounted for rotation about said ?xed axis and
being of substantially less diameter than said
?rst sun gear; gear means connecting said third
that with said other gear held stationary said
one gear is rotated by said arm and pinion at a
rate correct to drive said member at its regular
time rate; means for holding said other gear sta
tionary during normal operating periods; and
gear and said planet pinion; signal means
determining a synchronizing period of relatively
short duration occurring at regular time inter
means for advancing the setting of said time
indicating member comprising means for re
vals between successive normal operating pe
rotating said pinion about its rotary axis in the
leasing said other sun gear and means for
riods; means for holding said second gear sta
tionary during normal operating periods and for
releasing said second gear during synchronizing
same direction as it rotates when said other gear
is held stationary, but at a de?nitely slower rate.
10. A clock comprising a rotatable time indi
cating member; a motor constructed to operate at
periods; means. for holding said third gear
against rotation during synchronizing periods
a uniform time rate; a planet arm operatively
and 'for releasing such gear to permit free rota
connected to said motor and supported for rota
tion thereof during normal operating periods;
tion thereby about a ?xed axis and at a time rate
and stop means operable in response to said
materially faster than the normal operating rate
for said member; a, planet pinion rotatably
signal means and during said synchronizing
period ‘for stopping said member upon reaching
a predetermined time position and operable to
release said member at the beginning of the next
succeeding normal operating period.
_
8. Time keeping. apparatus comprising a
rotatable time indicating member; mechanism
operating;v at a de?nite time rate materially
65
mounted on said arm and movable therewith
through a prescribed orbit; a pair of sun gears
mounted for rotation about the same axis as said
arm and geared to said pinion; one of said sun
gears having a driving connection with said time
indicating member and the number of teeth on
said one sun gear being so proportioned to the
number of teeth on the other of said sun gears
ber; a planetary gear system connecting said 70 that with said other gear held stationary said
mechanism and said member for rotating the
one gear is rotated by said arm and pinion at a
latter at its normal time rate during normal
rate correct to drive said member at its regular
greater than the normal time rate for said mem
operating periods and comprising a planet arm
time rate; means for holding said other gear sta
tionary during normal operating periods; and
operatively connected to said mechanism for
rotation_,~ab'out a ?xed axis, a- planet pinion 75 means for changing the setting of said time indi
2,403,552
19
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cating member comprising means for releasing
scribed orbit, and ?rst and second sun gears
said other sun gear and means for positively ro
mounted, respectively, to rotate about said fixed
tating said pinion about its rotary axis and at a
predetermined rate different from its rate of ro~
axis and geared to said pinion, said ?rst sun
gear having a driving connection with said mem
tation while said other sun gear is held
ber, the number of teeth on said first and second
stationary.
sun gears being so proportioned that with said
11. A clock comprising a rotatable time indi~
second gear held stationary, said ?rst gear is
cating member; a motor constructed to operate
advanced at a rate proper to rotate said member
at a uniform time rate; a planet arm operatively
at its normal time rate; a third gear mounted for
connected to said motor and supported for rota 10 rotation about said ?xed axis and being of sub
tion thereby about a ?xed axis and at a time
stantially less diameter than said ?rst sun gear;
rate materially faster than the normal operating
gear means connecting said third gear and said
rate for said member; a planet pinion rotatably
planet pinion; means for holding said second gear
mounted on said arm and movable therewith
stationary during normal operating periods; said
through a prescribed orbit; a pair of sun gears
third gear being free to rotate during normal
mounted for rotation about the same axis as said
operating periods; and means for correcting for
arm and geared to said pinion; one of said sun
loss of time comprising means for releasing said
gears having a driving connection with said time
second gear, means for holding said third gear
indicating member and the number of teeth on
against rotation, and means for stopping said
said one sun gear being so proportioned to the 20 time indicating member upon reaching a prede
number of teeth on the other of said sun gears
termined time position.
that with said other gear held stationary said
14. Time keeping apparatus comprising a ro
one gear is rotated by said arm and pinion at a
tatable time indicating member; mechanism op
rate correct to drive said member at its regular
erating at a de?nite time rate materially greater
time rate; means for holding said other gear sta 25 than the normal time rate for said member; a
tionary during normal operating periods; and.v
planetary gear system connecting said mecha
means for advancing the setting of said time indi
nism and said member for rotating the latter at
cating member comprising an electromagnet ele~~
its normal time rate during normal operating
merit operable upon a change in ?ow of current
periods and comprising a planet arm operatively
thereto, means responsive to the operation of
connected to said mechanism for rotation about
said element for releasing said other sun gear
?xed axis, a planet pinion rotatably mounted
and for e?‘ecting positive rotation of said pinion
on said arm and movable therewith along a pre
about its rotary axis and in the same direction
scribed orbit, and ?rst and second sun gears
as it rotates when said other gear is held sta
mounted, respectively, to rotate about said ?xed
tionary but at a de?nite slower rate.
35 axis and geared to said pinion, said ?rst sun gear
12. A clock comprising a rotatable time indi
having a driving connection with said member,
cating member; a motor constructed to operate
the number of teeth on said ?rst and second sun
at a uniform time rate; a planet arm operatively
gears being so proportioned that with said second
connected to said motor and supported for rota
gear held stationary, said ?rst gear is advanced
tion thereby about a ?xed axis and at a time rate
at a rate proper to rotate said member at its
materially faster than the normal operating rate
normal time rate; a third gear mounted for rota
for said member; a planet pinion rotatably
tion about said ?xed axis and being of substan
mounted on said arm and movable therewith
tially less diameter than said ?rst sun gear;
through a prescribed orbit; a pair of sun gears
gear means connecting said third gear and said
mounted for rotation about the same axis as said 45 planet pinion; means for holding said second
arm and geared to said pinion; one of said sun
gear stationary during normal operating periods;
gears having a driving connection with said time
said third gear being free to rotate during normal
indicating member and the number of teeth on
operating periods; and means for advancing the
said one sun gear being so proportioned to the
setting of said time indicating member com
number of teeth on the other of said sun gears 50 prising means for releasing said second gear and
that with said other gear held stationary said
one gear is rotated by said arm and pinion at a
rate correct to drive said member at its regular
time rate; means for holding said other sun gear
means for holding said third gear against
rotation.
15. Time keeping apparatus comprising a driv
ing motor constructed to operate at a uniform
stationary during normal operating periods; and 55 time rate; a time indicating member; adjust
means for changing the setting of said time indi
able motion transmitting mechanism connecting
cating member comprising an electromagnetic
said driving motor and said member and oper
element operable upon a change in ?ow of cur
able in a ?rst adjusted condition to effect 01)
rent thereto, and means responsive to the opera
eration of said member at its normal time rate,
tion oi.’ said element for releasing said other sun 60 and operable in a second adjusted condition to
gear and for effecting positive rotation of said
effect operation of said member at a greatly ac
pinion about its axis and at a predetermined rate
celerated rate; and control means including sig
di?erent from its rate of rotation while said
nal means determining a synchronizing period
other sun gear is held stationary.
of relatively shore duration and occurring at
13. Time keeping apparatus comprising a ro 65 regular time intervals between successive normal
tatable time indicating member; mechanism op
operating periods and including means for send
erating at a de?nite time rate materially greater
ing a ?rst signal to initiate each synchronizing
than the normal time rate for said member; a
period and for sending a second signal to termi
planetary gear system connecting said mecha
nate such period, means responsive to said ?rst
nism and said member for rotating the latter at 70 signal for adjusting said mechanism to operate
its normal time rate during normal operating
in its said ?rst adjusted position and responsive
periods and comprising a planet arm operatively
to said second signal for adjusting said mecha
connected to said mechanism for rotation about a
nism to operate in its said second adjusted posi
?xed axis, a planet pinion rotatably mounted on
tion, and means operated by said signal respon
said arm and movable therewith along a pre 75 sive means for stopping said time indicating
2,403,552
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member upon reaching a position indicating the
beginning of the next normal operating period
one condition of adjustment at the end of said
synchronizing period; a first stop element mov
and for releasing said member at the beginning
of said next normal operating period.
16. In time keeping apparatus a, driving motor;
a seconds indicating member operated at its
position where said minutes member is stopped
thereby upon reaching a selected time position;
able between an inactive position and an active
a second stop element movable between an inac
tive position and an active position where said
seconds member is stopped thereby upon reaching
cating member; motion transmitting mechanism
connecting said motor and said minutes member
a selected time position; means for mow'ng said
and being constructed with two conditions of ad 10 first element into its said active position at the
justment, one of which provides for driving said
start of the synchronizing period and for after
wards moving said second element into its said
minutes member at its normal time rate and the
active position and concurrently with the stop
other of which provides for driving the minutes
member at a rate materially faster than normal;
ping of said minutes member; and means for re
means for operating said mechanism in its said 15 turning both said elements to their inactive posi
other condition of adjustment during a snychro
tions at the end of said synchronizing period.
normal time rate by said motor; a minutes indi
nizing period of predetermined duration and for
changing said mechanism to operate in its said
FREDERICK Q. RAST.
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