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Патент USA US2117508

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May 17,> 1938.
2,117,508
F. SCHNEIDER
ELECTRICALLY DRIVEN MASTER CLOCK
Filed Dec. 28, 1935
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2,111,508
Patented May 17, 1938
UNITED 4STATES PATENT oFFicE
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licatlon December 28 ,lîïyes‘lal No
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'I'his invention relates to electrically driven
' -master clocks, which serve for the electrical con
trol of secondary clocks. The contact device for
closing the operating circuit for tbe electric mo
' 5
tor driving the master-clock as well as the con
tact-device for reversing the operating current
form the subject matter of separate applications
for U. S. patent Ser. #56,458 and 56,457 filed by
me Dec. 28, 1935, simultaneously with this appli
cation.
\
.
According to the present invention a small
weighted lever is lifted and dropped every minute
by the driving work of the master-clock, the
weight of said lever amounting to about 1 gram.
Thus only an extremely small resistance will
have to be overcome by the driving work of the
master-clock` in order to release the control
mechanism for the secondary clocks. As said
resistance is ,represented by a constant small
20 weight which ‘may easily be released by the driv
ing-work of the master-clock, the latter may be
regulated to keep time with the greatest degree
of precision. In heretofore known master-clocks
the releasing of the contacts is effected as a rule
25 every minute by means of the second-wheel of
the clock, the contact being made in many cases
by means of >contact-disks, contact-pins or the
like mounted on the axle of the second-wheel.
Contact and release devices of this kind, how- ~
3Q ever, will necessarily unfavorably affect the driv
ing organs of the clock-work and, therefore, vmust
be made of very small weight preventing said
devices to be made in the form of a sumciently
solid and rugged mechanism able to reliably serve
35 itsy purpose. - A further disadvantage of known
contact and release devices of this kind consists
therein, that a minute-release cannot immedi
ately be used without difllculties with all'kinds of
’ clocks, such as second-clocks with >second-pen
40 dulums, three-quarter second-pendulums, hali
second pendulums, quarter-second pendulums or
nnally with'works using balance-wheels. It had,
therefore, .been impossible' to use one and the
same contact and release organ with diiferent
`
455
"u,
s»
U
y
.
may, therefore, immediately be used with second, ,
three-quarter second, half-second or quarter
second pendulum-operated clockworks as well >as
with works that are operated by a balance-wheel.
As the wheel for the minute-hand is mounted
on the- shaft to which'the driving spring is con
nected, the latter may be sofchosen that an un
diminished driving power is always supplied to
the driving-wheels of the clockwork. The swing
‘of the pendulum will thus always be maintained 10
at a vconstant amplitude, with the result that
even with half-second-pendulum-operated clocks
the time-keeping qualities will be of the highest g
order. Moreover, by using a contact-device of
rugged and reliable construction, there will be
attained _an absolutely reliable operation of the
system. In my present master-clock, further- '
more, the driving spring of the clockwork is re- -
wound every minute simultaneously with the rev
olution of the contact-wheels by means of wind 20
ing-wheels meshing with the driving-wheels, so
that practically always a constant driving power
is supplied to the driving-mechanism ofthe clock.
According to my invention, furthermore, the
contact-disk is in mesh with the motor-operated 25
wheels of the clockwork and thus rotated simul
taneously withl said wheels, while the ratio of
gearing between the latter and the motor is rather
high with the result that `a. relatively large con
tact-pressure and ’a reliable electrical contact is 30
obtainable at the contact-member of the con- Y
tact-disk. In consequence of this, said contact
member will be able togoperate> powerful lever
switches serving to furnish the alternating cur
rent-impulses for the control of the secondary 35
clocks. This contact-device forms the subject
matter of a separate application for U. 8. patent
ser. #56,458 illed by me simultaneously with this
application'.
.
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l
-“
-
Owing to the combination of the aforemen 40
tioned arrangements the master-clock willy be
able toïreliably operate a great number of sec-l
ondary clocks connected. up in a loop with said
master-clock, in a manner to attain greatest re
- liability and safety of operation yof the system 45
45
By my prese _t invention the minute-release is and more particularly also in case a master-clock
of the smallest type is used, for instance a quar
effected by the usual wheels which serve for vdriv
ing the hands of the clock, and more particularly ter-second pendulum-operatedJ clock. The small
electric motor will berotated every minute for a
by means ofthe aforementioned contact and re
period of about two seconds‘à figured from the
lease device which is of rugged and reliable con
struction. The release-wheels, moreover, are in moment at which the motor is started4 to the
kinds of clockworks.
-
'
'
~every ‘case meshing with the driving-wheel for
the minute-bando! the clock, said wheel being
mounted on `theaxle of the minute-wheel of the
55 clockwork. The- 'same wheel-system for the hands
lmoment at which the motor comes to standstill
in no-load condition. The small electric motor
which is preferably used in connection with the
present system of master-'clock forms likewise
,2,2
2,11%,508 '
the subject matter of a special application Ser.
#56,456 for U. S. patent, ñled by me simultane
ously with this application now Pat. 2,097,134.
In the accompanying drawing which forms part
the wheel 59 (Fig. l) , the shaft 5I of the latter
being provided with a sleeve of insulating mate
rial, said sleeve carrying the contact-disk 52 fur
nishing the current-impulses for operating the
of this specli‘lcation I have represented an exem
secondary çloclm. The contact-disk 52 carries Ul
pliñcation of a construction of the master-clock, v the contact-pin 53 and the two insulating pins
which forms part of my present invention, Fig. 1 56 and 55. A contact-,bolt 51 is mounted within a
being a iront-view of my present master-clock sleeve 56 of insulating material fast on the plate
including a contact-device serving to operate the Ifa current-supply spring 58 being provided on
10 secondary-clocks by supplying proper current
said bolt 51, the free end of said spring sliding 10
impulses thereto, and Fig. 2 a top-view of the on the periphery of said contact-disk 52.
On the plate I is further mounted an insulating
clockwork of the master-clock shown in Fig. 1,
said. clockwork being developed out into a plane. plate 59, the terminals or binding-posts G0, 6I,
Referring more particularly to thedrawing, the 62, 63 and 64 being iixed to said plate 59.l Mount
16 gear-wheel 2 for the> minute-hand is mounted to ed rotatably about the binding-posts 60 and 6I
rotate with proper friction about the axle of the is the contact-lever 65 and the contact-lever 6G,
minute-wheel of the clockwork, said wheel 2 respectively, while the binding-post 62 is provided
meshing vwith the change-wheel 3-mounted ro
at its upper end with an extension carrying the
tatably in the bearing-bracket 4 fast 'on the plate contact-plate 61. The contact-levers 68 and 69
v20 I oi.' the clockwork. Mounted on the axle of said are mounted rotatably about the binding-posts 20
change-wheel3 is the wheel 5 meshingwith the 63 and 64, respectively. The free upper ends of
pinion 6 of the lifting-wheel 1 carrying the lift,
the contact-levers 66 and 68 are provided with
ing-pins 8. `The wheel 1 is mounted rotatably rollers of insulating material and kept together
i
between said plate I and a bearing-bracket 9 fast . by action of a tension-spring 10. In like manner
25 on said plate. A pivot I0 is fastened to the plate also the upper ends oi.' the contact-levers 65 and
I (Fig. 1) and a cranked lever II, I2 is mounted '69 are provid with rollers of insulating mate
swingably about said pivot I0. The free end of rial and kept to ether by a tension-spring.
the horizontally directed arm I2 oi' said cranked
The contact-bolt 51 is connected by way of the
lever ycarries _ a small weight I3. A further lead 1I to the-one pole of the battery 1.2, the
30 cranked lever I5,- I6 is swingably mounted on an
other pole of said battery being connected to the 30
other pivot I4 on the plate I, the’ cranked lever binding-post 62 by way of the lead 13. Con
~ I5, I6 being arranged with respect to said former
cranked lever II, I2 in such a manner that said
weight I3 rests on the free end of the horizon
nected to the binding-posts 6I and 63 are the
leads 14 and 15, the secondary clocks being inter
posed in parallel therebetween. The binding-post
35 tally directed arm I5 of said cranked lever I5, I6. , 60 is connected by the lead 11 with the one elec
The cranked lever I5, I6 is kept under the action - trode of the coherer-resistance 18, the other elec
of :a spring I1 tending to press the horizontal arm trode of the latter being connected with said lead
I5 against a pin I8 fixed to the plate I. The con _' 14 by the lead 19. Connected to the binding-post
tact levers 23, 25 y.together with the actuating 64 is the lead 8|! making connection with the one
40 lever 2l! are mounted swingably about a further
electrode of the coherer-resistance 81, the other 40
pivot I9 fast on the plate I.` The actuating lever ' electrode of the latter being connected to the lead
20 carries on its free end a pin 2I by means of 15 by way oi' the lead 82.
which said lever 20 rests on the vertical arm I6
. On the plate I oi.' the clockwork there is fur
that forms part of the cranked lever I5, I6. A ther mounted a binding-post 84 connected by a
45 spring 22 exerts a constant downward pull on lead 35 with the one pole of a battery 86. The
said actuating lever 20. The contact springs 24 other pole of said battery is connected by way of
and 26 are mounted on the contact levers 23 and
the lead 81 with the insulated binding-post 88;
25, respectively, while the actuating lever 20 is
the latter making connection with one oi' the
equipped with a nose 21 upwardly extending> brushes of the small electric motor 31; the other
therefrom. 'I'he prolonged portion of the shaft of the brushes of said motor 31 is connected to
of the main driving worm-wheel 28 carries the the binding-post 89 and the latter to the con
driving wheel 29 for the contact-device which tact-bolt 9| by means of the lead 99, said con
serves to furnish the current impulses forl the tact-bolt 9| being provided with a spring 92 for
operation of the secondary clocks.
55
-
f
On a further pivot 30 fast on the plate iis
rotatably mounted the contact-wheel 32, a bush
ing 3I being interposed between said'pivot and
supplying current thereto, said spring 92 sliding
on the peripheral surface of the contact-drum 33
and being further provided with a contact-pin
93. The hour-wheel 95 forming part of the
train oi.' wheels for the hands of the clock is
mounted rotatably on the bushing 96 oi’ the
minute-wheel shaft ‘forming part of said train of GI)
wheels for the hands oi' the clock and meshes
with the pinion £1 of the change-wheel 3. On
said contact-wheel. A sleeve of insulating mate
rial is placed on said bushing 3 I, said sleeve carry
60 ing a contact-cylinder 33 provided with a recessed
part or incision 34, while a contact-pin 35 is
mounted on the outer surface Aof said cylinder
33. ’I'he contact-wheel 32 is in mesh with the . an arm 94- projecting from the running-wheel 29
driving-wheel 29. The worm 38 coupled to the there is provided a pin 98 at such a position
65 shaft 35 of the small electric motor 31 is in mesh
with respect to the nose 21 on the aforesaid actu 65
with the main driving wormwheel 23, the pinion ating-lever 2D that said arm 94 may co-operate
49 on the latter being in mesh with the wheel 39, with said lever 20.
the pinion 40 of the latter with the wheel 4I
A coupling-disk 99 engages laterally with the
' and the-latter with the spring-barrel 4wheel 42.
70 The minute-wheel 43 meshes with the pinion 44
on the wheel 45 which forms partof the driving?
work, said wheel 45 is againmeshing with the
pinion 46 of the ratchet-wheel 51 engaged by the
75
pawl 48 forming part of the anchor-escapement.
The wheei 39 of the driving Work meshes with
driving worm-wheel 23, said coupling-disk being
carried with said ‘worm-wheelßby action of fric 70
tion therebetween.
The above described system of master-clock
and secondary clocks operates as follows:
Upon clockwise rotation of the minute-wheel
I Iorming part of the train of wheels for the 75
3
2,117,503
handsof the clock, the change-wheel 3_ meshing . closed until the contact-spring 28 comes outof
contact with the contact-drum 33 when drop
with said minute-wheel 2 will be rotated counter
clockwise so that the wheel 5 mounted on the ping into the recess 34 thereof. In the meanwhile
the pin 35 on the contact-drum 33, upon further
shaft of said change-wheel 3 will likewise be ro
tated. By way of the pinion 6 meshing with the rotation, has come out of the range of action of
wheel 5 also the wheel 1 carrying the lifting-pins
8 will be rotated in clockwise sense. Upon con
tinued rotation of the wheel 1 the arm II con
nected to the weighted lever I2, I3 is gradually
lifted by action of said lifting-pins 8, until said
arm gradually slides olf the respective lifting-pin.
The arm I2 with the weight I3 thereon is thus
likewise lifted at first together with lsaid arm II
and thereupon falls back, so that said weight I3
will rock the arm I5 of the cranked lever I5, I8
in downward direction. During the rocking mo
tion thus imparted to the cranked lever I5, I8
about its pivot I4 the arm I6 will turn out to
wards the left, so that the pin 2I which had so
20 far been resting on said arm >will slide off the
latter and now .abut against the right-hand side
thereof. By action of the spring 22 a powerful
motion in downward direction is imparted to the
actuating lever 20 swinging about the pivot I9,
25 thus effecting proper displacement of the con
tact-levers 23 and 25, with the result that the
contact-spring 24 will firmly abut against the
contact-pin 93 and the contact-lever 23 against
the contact-cylinder 33. The point of action of
30 the spring 22 on the actuating lever 2li is properly
located with respect to its center of rotation,
that is with respect to the pivot I9, to effect a
strong pressure between the contacting surfaces
and therewith a reliable electrical contact for
35 the control of the secondary clocks, as only a
small adhesion between the pin 2I and the arm
the contact-lever 23. The motor 31 operating at
no-load is thereupon caused to .come to stand
still by action of the pin 98 on the arm 94 pro
jecting from the running wheel 29, said pin 98
engaging with the nose 21 on the actuating lever
20. During operation of the motor 31 the con
tact-wheels as well as the Winding-wheels have
simultaneously been set into rotation, re-wind
ing of the _driving-spring for the driving-wheels
of the clockwork having been accomplished by
way of the wheels and pinions 28, 49, 39, 4l, 4I
and 42. Re-winding of said spring is effected
every minute, the amount of such re-winding be
ing sufficient to keep the clock in operation until
the next winding-up period.
The running gear-wheel 39 is also in mesh with
the gear-wheel 50 for the contact-disk 52 insu
lated from its shaft, so that said gear-wheel 58
will be rotted through one half-revolution during
every period of contact. By this the contact 25
pin 53 on said contact-disk 52 will close and
open, alternately with one and the other of the
contact-levers 88 and 88, the circuit which serves
for the control of the secondary clocks 18. 'I‘he
direction of the current in this case changes as
follows:
v
During the first contact-period the contact
pin 53 makes contact With the lever 88, thus
closing the circuit 53, 88, 83, 15, 18, 14, 8|, 88,
81, 82, 13, 12, 1I, 51, 58, 52; during the second 35
contact period the circuit 53, 88, 8|, 14, 18, 15,
lI6 of the cranked lever I5, I8 has to be over
83, 88, 81, 82, 13, 12, 1I, 51, 58, 52 will be estab
come in the present case. By action of the con
tacts 23-33 and 24-93 an- electric circuit 84
lished. In either case the insulating pins 54 and
55 on the contact-disk 52 will interrupt the con
tacts 66-61 as well as 81-88, before the contact
pin 53 comes in engagement with the levers 58
and 88, for the purpose of preventing a short
circuit from arising prior to proper closing of
the circuit. The two auxiliary contact-levers 85
and 69 serve for the suppression of sparks even
tually arising at the main-contacts. Said two
contact-levers 85 and 89 during every contact
period are operated first,l thus inserting into
circuit in front of either main-lever one of the
40 85-88-81-88-89-90-9I--92-33-23 will be
closed to operate the motor 31, 23-33 represent
ing a sliding contact and 24-93 a point-contact,
the latter coming into- action with a small dis
placement with respect to the former. Closing
45 of the circuit for the operating current is thus
accomplished in a double Way 'and in addition
to this an automatic cleaning or polishing of the
cooperating contact-surfaces attained. 'I‘he
small motor 31 will start immediately upon be
50 ing inserted into circuit, thus imparting rotation
by way of its shaft 38, the worm 38 thereon and
the driving worm-wheel 28 meshing with said
worm 38. Rotation’is thus imparted to the run
ning-wheel 29 which is mounted on the shaft of
said worm-wheel 28 together with the pin 98 on
the arm 94 projecting from `said wheel 29. The
running wheel meshes with the contact-wheel
or disk 32 and likewise imparts rotation to the
latter as well as to the contact-drum 33 mounted
on the said contact-wheel or disk 32 and insu
lated therefrom.. Upon continued rotation the
pin 35 on the contact-drum 33 will abut against
the contact-lever 23 and press ‘the latter away
from said contact-drum into initial position. Si
65 multaneously therewith the actuating arm 28 is
again lifted backward until the pin 2l on said
arm -20 slides along the arm I8 forming part-of
the cranked locking lever I5, I8 and comes again
in engagement with the latter, subsequent to the
70 returning of said lever I5, I8 into its- initial po
sition abutting against the stop I8, by action of
the‘spring I1. The motor 31, in spite of this,
will continue to rotate, the contact-arm 25 still
maintaining the motor circuit closed by action
75 »of the contact-spring 28. This circuit remains
coherer-resistances 18 and 8|, while during inter
ruption of the circuit the levers 85 and 89 are
subsequently separated from the contact-pin 53,
so that in this case also the inserted coherer
resistance will come into action between the
main and auxiliary contact.
I claim:
'
'
1. In> a switch mechanism for master clocks
and the like and which is operable by means 'of a
small actuating force, the combination of a rela
tively iixed contact, a pivoted bell crank lever,
a movable contact carried by one arm of said
bell crank lever and cooperable with said ñxed
contact for completing an electrical circuit, re
silient means for moving said bell crank in a 65
direction to close said contacts, a latch for hold
_ing said bell crank against movement by said
resilient means, a weighted element, means for
periodically raising said weighted element and
releasing it for relatively free falling movement, "
means for receiving impact of falling movement
of said Weighted element and transmitting the
energy therefrom to said latch to move the latter
to releasing position, whereby saidbell crank lever
may move to contact closing position, and means
4
2,117,508
for moving said bell crank lever to contact open
forces, means to store up energy from said driv- '
lng position. ‘
ing means and to release the stored energy sud
denly, means to transmit the energy from said
energy storing means to said latch to move the
latter to- releasing position, thereby permittingl
said lever to move to contact closing position,
and means to restore said lever to a. position‘ in
2. In a switch mechanism for master clocks
and the like,l the combination of a relatively Ilxed
contact, a pivoted lever, a contact carried by one
arm of said lever and cooperable with `said ilxed
contact, resilient means for moving said lever to
contact closing position, a latch for holding said
lever against movement by said means, a driving
m means capable of transmitting relatively small
which said contacts are open.
FERDINAND SCHNEIDER;
10
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