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Патент USA US2135935

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Nov. 8, 1938.
J. w.I BRYCE
2,135,935
SYNCHRONOUS CLOCK SYSTEM
med April 11, 1934 V
2 sheets-sheet 1
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i12/:ENTA R
¿BY
`
f- ATTQRNEY
NOV. 8,
2,135,935
J. W_ BRYCE
SYNCHRONOUS CLOCK SYSTEMy
Filed April 11, 1954
2@ l
2 Sheets-¿Sheet 2
IIHHII HHIIIHIHHIIIIHI
INVENTOR
BY
`
'ATTORNEY
*l Patented Nov. 8,1938
_ 2,135,935
UNITED STATES PATENT OFFICE
2,135,935
SYNCHRONOUS CLOCK SYSTEM
James W. Bryce, Bloomfield, N. J., assignor to
International Business Machines Corporation,
New York, N. Y., a corporation of New York
Application April 11, 1934, Serial No. 720,015
7 Claims. (Cl. 58-24)
This invention relates to a synchronized clock ing of contacts I6. In the preferred embodi
system and more particularly relates to the pro
ment, contacts I6 are' arranged to close for a
vision of an improved method for synchronizing short period and then open prior to the sixtieth
secondary impulse clocks which are controlled minute.
by a so-called master clock.
In addition, the master clock is provided with 5
The present invention is directed to actuation the usual minute impulse contacts I1 which are
and synchronization of the secondary Clocks `controlled in the usual way from a minute cam
under the control of a master clock by the agency
I8 or otherwise as is the custom in clocks of this
of electrical energy and has for its object the uti
sort.
lization of impulses by an improved secondary
For accelerating the advance or forward move 10
clock mechanism for synchronizing the secondary
clocks, which impulses are initiated and con
trolled by the master clock during successive
periods of time.
v Various other objects and advantages of my in
vention will be obvious from the following par
ticular description of one form of mechanism
embodying the invention or from an inspection of
the accompanying drawings, and the invention
20 also constitutes certain new and novel features
of the construction and combination of parts
hereinafter set forth and claimed.
In the drawings:
Fig. l is a wiring diagram by which secondary
clocks may be actuated and regulated in the
practice of the present invention.
Fig. 2 shows the position of the secondary clock
mechanism just before release of the stop pawl.
Fig. 3 shows the position of the secondary clock
30 mechanism when stop pawl is released.
Fig. 4 shows the position of the secondary clock
mechanism during resetting of released stop pawl.
Master clock-_The master clock in its general
details may be of any desired form. For example
35 it may be that shown in my prior Patent No.
1,390,018. Referring to Fig. 1, the master clock
includes the usual train adapted to drive the
minute arbor I6 which makes one` revolution per
hour. The usual escapement mechanism II is
40 provided.
Fixed to the minute arbor is a cam
I2 with two drop-01T shoulders causing contacts
I4 to be closed during the intervals between the
successive releases of the two levers carrying said
contacts.
Preferably, the arrangement of parts is such
45
that the contacts I4 are normally open and are
closed for two short intervals during a regular
period of about one hour duration. It will be
obvious, however, that by a proper rearrange
50 ment of the associated parts of the system these
cam contacts could operate in a reverse manner
being normally closed and opened during the
short intervals in the hourly periods.
Also ñxed to the minute arbor Ill is a cam I5
55 which is adapted to control the opening and clos
ment of the secondaries quick acting contacts I9
are provided and preferably operated by attach
ing one of them to the escapement mechanism i l.
'I‘hese contacts will close at every movement of
the escapement mechanism.
15
Secondary clock-_The secondary clock in
eluded in Fig. 1 is of conventional form and it
includes a minute arbor shaft 2i) which makes
one revolution per hour. This shaft is preferably
advanced by means of an impulse magnet 2l
which acts through the usual ratchet wheel 22
to advance the minute arbor 29 step by step each
time the magnet 2l receives an impulse from the
master clock. Carried by the minute arbor 2B on
each synchronizing clock is a. cam disk 23 pro-vided with a stud 24. Pivotally mounted at 25 is
a locking paw] 28 supported bya suitable plate
21 (Fig. 2) in the secondary clock and adapted to
cooperate with stud 24 when in the lower position
as shownand held in this position by resilient
spring detent 28. Also pivotally mounted to plate
21 is lever 29, acted upon by springs 30 and 3l
holding said lever in position, and loosely at
tached to arm 32 cooperatingv with cam disk 23
under influence of spring 33. Also loosely at
tached tok `lever 29 is link 34 connected to crank
lever- 35 pivotally mounted at 25 and engaging
pin 36 secured to pawl 26. Adapted to engage
pin 36 is another lever 31‘rotatably mounted at
38 and loosely attached to arm 39 provided with
a protruding finger 40 adapted to cooperate with
disk 23 by virtue of spring 4I.
At the free'i end of> arm 39 is an offset 42
adapted to be engaged by extension 43 of arma
ture 44 wheny arm >3,9 is in the position shown in
Figs. 2 and
vArmature* 44 pivoted at 45 is pro
vided with an.A extension arm 46 adapted to en
gage arm`§32 v'when the described linkage is in a
position" as shown in Fig. 4 and to be described
hereinafter. Assuming the linkage to be in po
sition asV indicated in Fig. 2, an impulse thru
magnet 41 causes its armature 44 to be attracted
and engage the olïset 42 of arm 39 to force arm 39
downwardly as shown in Fig. 3. Downward
movement of arm 39 causes lever 31 to urge pin 65
2
2,135,985
36 on pawl 26 upwardly to the position as indi
cated in Fig. 3 in which position the pawl 26 is
retained by coacting spring detent 28 releasing
the stud 24 on cam disk 23. After rotation of
the cam disk 23 in a clockwise direction for a
short period another impulse thru magnet 41
causes its armature 44 to be attracted to engage
the arm 32 displaced by the shoulder on cam
to bring it into synchronism with the master
clock. The normal position of each pawl 26 as
explained is in the path of its respective stud 24
on cam disk 23.
Should any of the clocks be slow they must be
stepped ahead at a rapid rate in order that they
be on time on the hour.
This is accomplished
said recess and shoulder being so arranged on the
by causing rapid actuations of magnets 2| just
before each hour reading of the hands of the
master clock. Cam I5 closes contacts I6 prefer
ably ai'ter the fifty-ninth minute and allows a
branch current to ñow from battery 50, switch
5I, contacts I6, line 58, contacts |9, magnet 53,
cam disk that only one arm, either arm 39 or
and line 54 to ground. Contacts I8 close in com
disk 23. Arm 39 is not engaged by armature 44
10 when not located in the recess in cam disk 23
and arm 32 is not engaged by armature 44 unless
displaced by the shoulder on the cam disk, the
15 arm 32 can be engaged by the attracted arma
ture 44 at one time. Engagement of arm 32 by
the said armature rocks the arm 32 and lever 29
to the right as shown in Fig. 4 to cause link 34
to urge crank lever 35 downwardly on pin 36 on
20 pawl 26 to restore pawl 26 to its former lower
paratively rapid succession, for example, once 15
position and in the path of the stud 24 on the
disk 23.
The disk is timed with reference to the minute
hand of the secondary clock so that when the
25 minute hand indicates the 59th minute the stud
on the disk will be close against the pawl 26.
When the pawl is raised the stud will befreed
as shown in Fig. 3.
Normal operation-A full explanation of a
manner in which the method may be practiced
will be described with reference to Fig. l.
The first operation to be described will be the
normal impulse operation for actuating the sec
ondary clocks. For clarity, it will be assumed
to magnets 2| thus producing rapid advance of
any slowly timed secondary clocks.
In my preferred embodiment, this period of ac
35 that all of the secondary clocks are in a position
when contacts 55 are closed on the hour impulse.
immediately after the hour reading. Referring
to the wiring diagram illustrated in Fig. l cur
rent is supplied from a battery indicated at 50
and the clocks are continuously actuated by min
40 ute impulses through magnets 2| described
above. It is understood that battery 50 is but a
conventional designation for a source of electrical
impulses and that other forms of impulses besides
direct current impulses are within the scope of
45 this invention.
Current from battery 5I! flows thru switch 5I,
line 52, contacts I1, magnet 53, line 54 to the
common return ground.
This current is inter
mittent due to the periodic closing of contacts I1
50 by cam I 6 on the minute arbor of the master
clock, and therefore contact 55 will be closed and
opened at minute intervals.
This will allow an
intermittent current to iiow from battery 50, line
56, line 51, contact 55, magnets 2| to common re
55 turn ground, thus causing magnets 2| acting
through the ratchet 22 to advance the minute
arbor 20 step by step as each minute impulse is
received by magnet 2I. All of the secondary
clocks 'of the system will be actuated in this man
60 ner.
Synchronization.--Synchronization of the sec
ondary clocks to the so-called master clock is
maintained hourly by the master clock sending
one impulse at some period during the hour and
65 at the same time an impulse energizing magnet
2| is delivered to the secondary system to energize
magnets 41 to position locking pawl 26 into the
path of stop 24 on cam disk 23 as described here
inbefore, and a second similar impulse later in the
70 same hour period for example the sixtieth minute
every two seconds and causes the intermittent
current set up to energize magnet 53 at the same
rate. This results in closing contacts 55 at the
same rate and current from battery 50 through
lines 56 and 51 through contacts 55 is conducted
celeration of the slow clocks occurs shortly after
the nity-ninth minute and lasts for about thirty
seconds, thus allowing for a positive correction of
fifteen impulses each hour. This period may be
lengthened if desired, but it must terminate prior
to the closing of contacts I4, to cause the release
of stop 24, by cam I2 which is timed to close the
contacts on the hour.
As stated before, the locking pawl 26 is raised
when contacts I4 are closed and when magnet 41
is energized. Energization of magnet 41 occurs
Current then Will flow from battery 50, line 56,
line 51, contacts 55, line 56, contacts |4, line 60,
magnet 6| to ground, energizing magnet 6I to
close its contact,62, allowing current from bat
tery 50 to flow thru line 56, contact 62 to magnet
41 to ground. Just prior to the hourly impulse
the minute arbor of the synchronized clocks is in
a position as shown in Fig. 2, the stud 24 is en
gaged by locking pawl 26, the extension 40 of arm
39 is cooperating with the recess in cam disk 23
and arm 32 is cleared of the shoulder on said
disk. So that energization of magnet 41 at this
period, namely, the hour impulse, attracts its
armature 44 to engage and depress arm l! to
cause the locking pawl 26 to be raised and main
tained in the raised position to free stud 24 as
explained hereinbefore. Since contacts I4 and
contact 62 are closed on the hour, locking pawls 26
will be removed from the paths of the studs 24
on disks 23 and all of the clocks will continue 55
their movement in synchronism.
At some period after the hour contacts I4 are
adapted to be closed again by the second shoulder
on cam I2, and at the same time the minute im
pulse contacts I1 are closed, for example, the
eighth minute, so that current again flows from
battery 50 through lines 56 and 51, now closed
contacts 55 due to energization of magnet 53 by
the eighth minute impulse, line 56, contacts I4,
line 6U, magnet 6I to ground, energizing magnet 65
6I closing its contact 62. Current then flows from
battery 50 thru line 56, contact 62, to magnet 41
and ground, energizing magnet 41. At the tlme
the eighth minute impulse is transmitted the
minute arbor of the secondary clocks is in a posi 70
impulse to energize the magnets 41 to raise the
tion so that the shoulder on its attached cam
locking pawl 26 to free said stud 24. If any one
oi.' the clocks is fast, the minute arbor 26 of the
disk 23 dlsplaces the cooperating arm 32 to a po
sition as shown in Fig. 4 so that the attracted
armature 44 of the energized magnet 41 engages
arm 32 to move it to the right as previously ex
secondary clock will be stopped by its pawl 26
75 until it has been retarded an amount suilicient
2,135,935
plained and in so doing causes the locking'pawl
26 to be reset from its raised position as shown in
Fig. 3 to its normal lower position as shown in
Fig. 4 to be in the path of cam disk stud 24.
It will be apparent from the foregoing that the
period of coincidence of all the clocks in the
system described in this embodiment of my in
vention occurs after the fifty-ninth minute and
may last until a few seconds before the sixtieth
10 minute, allowing for an advance of slow second
ary clocks of as much as ñfteen minutes and a
retardation of fast secondary clocks of a maxi
mum amount of a little less than fifty two min
utes. It is manifestly obvious that the correc
15 tions may be relatively varied according to the
timing of the various cams.
It will be understood that if in any case it is
required to correct the time of the entire system,
as for example, when the master clock is running
20 fast or slow and this correction is to be within
the range permitted by the synchronizing period
it is only necessary to reset the hands of the
master clock to the desired extent. The sec
ondaries will then set themselves Within the next
25 hour. If the amount is in excess of the synchro
nizing period for which the system is designed,
'for example, when a daylight saving correction
is required, a manual control is brought into op
eration as shown in Fig. l which will now be de
scribed. Referring to the diagram a wire 65 is
provided terminating in a switch point as shown.
To retard the secondary clocks the switch 5i is
displaced to the open or ofi position. This switch
is maintained open for the desired retarding
35 period.` If it is desired to advance the clock, the
switch 5l is thrown to connect with the switch
point or Wire 65. The effect of connecting switch
5i with wire 65 is to cause the fast set-up con
tacts I9 to come into action and rapidly advance
the various secondary clocks. The switch 5| will
be held closed until the secondary clocks advanceV
to the desired extent. For example to advance
all of the clocks one hour withl contacts iii clos
ing every two seconds it will take two minutes to
45 bring about the proper advance of the second
aries.
It will be understood that it is not essential to
hold switch 5| closed for the exact period inas
3
and moved ahead until the disk 23 is stopped by
pawl 26. Following immediately after the cessa
tion of the accelerating impulses, all the pawls
26 will be raised, and the secondary clocks will
then continue to operate in synchronism with the
master clock.
While there has been shown and described and
pointed out the fundamental novel features of
the invention as applied to a single modification,
it will be understood that various omissions and 10
substitutions and changes in the form and de
tails of the device illustrated and in its operation
may be made by those skilled in the reset without
departing from the spirit of the invention. It is
the intention therefore to be limited only as indi
cated by the scope of the following claims.
What is claimed is as follows:
1. A synchronized clock system including a
master clock and a secondary clock, means in the
master clock for sending normal driving impulses 20
periodically to the secondary clock, means in the
secondary clock controlled by said impulses to
advance it accordingly, a device controlled by the
master clock for sending additional periodic im
pulses to the secondary clock, instrumentalities 25
for restraining advancement of the secondary
clock when it reaches a certain chronological po
sition, mechanism in the secondary clock posi
tioned in accordance with the chronological posi
tion of the secondary clock, and means cooperat 30
ing with said mechanism and controlled by the
said additional impulses so that the receipt of one
of such impulses renders the said restraining in
strumentalities either to be subsequently effective
to prevent further advancement of the secondary
clock or to release said restraining instrumen
talities depending on the chronological position
of the aforementioned mechanism.
2. A synchronized clock system including a
master clock and one or more secondary clocks, 40
means in the master clock for sending periodic
driving impulses to advance said secondary
clocks, means controlled by the master clock for
sending additional current impulses to the sec
ondary clocks, blocking means movable into and
out of blocking position for restraining advance
ment of the secondary clock, means settable in
accordance with the chronological position of
much as the synchronizing system will function
50 to bring the clocks in time with the master clock
whether the said secondary clocks are fast or
the secondary clock for controlling said blocking
means, and electromagnetic means controlled by
said additional impulses for moving said blocking 50
slow with respect to the master clock. It is only
necessary that they be brought within the range
of the synchronizing period.
means into or out of blocking position in accord
ance with the setting of said settable means.
3. A synchronized clock system including a
master clock and one or more secondaryA clocks, 55
means in the master clock for sending periodic
55
The above is equally true with regard to re
tarding operations it being only necessary to open
switch 5I for approximately the desired retarding
period.
60
-
y
In Fig. l, three secondary clocks are illustrated
showing their time relation to the master clock.
The hands and cam disks 23 are shown as rotat
ing in their normal direction.
'
As stated previously, at the hour all of the
65 secondary clocks behind time will be urged ahead
by the rapid series of accelerating impulses, but
since clock X is on time it will not be affected for
locking pawl 26 is in the path of cam disk stud 24
and will hold the cam disk in position until the
70 stud is freed. Clock Y is shown to be 15 minutes
fast and its cam disk locked in position and held
so until the hour, while clock Z which is indicated
to be 15 minutes slow will continue to operate
until it is picked up by the accelerating impulses
75 occurring shortly after the fifty-ninth minute,
driving impulses to advance said secondary
clocks, means controlled by the master clock for
sending additional current impulses to the sec
ondary clocks, blocking means movable into and 60
out of blocking position for restraining advance
ment of the secondary clock, a member movable
with the chronological advancement of said sec
ondary clock, a plurality of settable members co
operating with said blocking means and said> 65
movable member and positioned in accordance
with the chronological position of said movable
member, and electromagnetic means common to
said settable members for controlling the same
to move the blocking means into or out of block
ing position in accordance with the position of
said settable members.
4. A synchronized clock system including a
70
master clock and a secondary clock, means in the
-master clock for sending normal driving impulses 75
4
2,135,935
periodically to the secondary clock, means in the
secondary clock controlled by said impulses to
advance it accordingly, means controlled by the
master clock for sending additional periodic im
pulses to the secondary clock, means for restrain
ing advancement of the secondary clock when it
reaches a certain chronological position, settable
ary clocks, magnetically operated means in the
secondary clocks for blocking advancement of
said secondary clocks, said means being. alter
nately movable into and out of blocking position
on successive magnetic operations in accordance
with the chronological position of said clock, and
means in the secondary clock positioned in ac
means in said master clock for transmitting
cordance with the chronological position of the
periodic uni-directional current impulses to said
magnetically operated means wherein successive
10 secondary clock, means cooperating with said
uni-directional current impulses cause alternate
settable means during certain predetermined
chronological positions of the secondary clock so
that upon receipt of one of said additional im
pulses the settable means is controlled to render
said restraining means to be subsequently effec
movement into and out of blocking position.
'7. A synchronized clock system including a
tive to prevent further advancement of the sec
clocks, means in the secondary clocks controlled
ondary clock beyond a certain chronological posi
by said impulses to advance the secondary clocks
tion, and said last-named means cooperating with
said settable means during another predetermined
20 chronological position of the secondary clock so
that upon receipt of a successive additional im
pulse the settable means is controlled to release
the restraining means to permit advancement of
said secondary clock.
5. A secondary clock including an electromag
25
net for advancing said clock, a blocking device
for restraining advance of said secondary, a cam
member driven by said electromagnet, a plurality
master clock and one or more secondary clocks,
means in the master clock for sending normal
driving impulses periodically to the secondary ll
accordingly, means controlled by the master
clock for sending additional uni-directional
periodic impulses to the secondary clocks, an
electro-magnet in each secondary clock oper
able by said additional uni-directional impulses,
means for restraining advancement oi' the sec
ondary clocks when they reach a certain chrono
logical position, means operable in a certain
chronological condition of the secondary clocks
including means controlled by said electro-mag
net upon operation by one of the said additional
of cam followers variably positioned at different
BO chronological positions of said cam member, con
necting linkages cooperating with said cam fol
lowers and said blocking device, and electromag
uni-directional impulses to render the said re
straining means to be eil'ective to subsequently
prevent further advancement of the secondary
clocks when they reach a certain chronological
netic means common to both cam followers for
controlling one or the other to control the oper
position, and means including means controlled
35 ation of said blocking device.
by said electro-magnet upon operation by the
6. A synchronized clock system including a
next successive additional uni-directional im
pulse to render said restraining means ineffective,
master clock and one or more secondary clocks,
means in the master clock for periodically trans
thereby permitting further advancement of said
secondary clocks.
mitting electric impulses for driving the second
JAMES W. BRYCE.
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