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Патент USA US2117507

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May 17, 1938..
Filed Dec. 28, 1935
Patented May 17, 1938
2,117,507 '
Ferdinand Schneider, Fulda, Germany
Application December 28, 1935, Serial No. 56,457
3 Claims. (Cl. 200-26)
This invention relates to contact-devices for
eration of secondary clocks from a master-clock.
electric master-clocks which serve for operating
secondary electric clocks. In heretofore known
contact-devices used for this purpose current
sented two examples of construction of my novel
5 carrying contact-springs have been used, said
contact-springs carrying the operating current
for the secondary clocks. These known contact~
devices have the disadvantage that they do not
permit passage of a relatively strong operating
10 current so that only a small number of secondary
clocks can be operated from the master-clock.
Furthermore, known contact-devices are liable to
. relax after some time, that is the contact-mem
bers will lose their tension, and in consequence
thereof the contact-pressure will soon be di
minished with the result that a safe and reliable
making-of the contacts cannot be attained with
certainty for a greater length of time.
According to this invention, the aforemen
tioned current-carrying contact-springs are re
placed by contact-levers which are amply dimen
sioned in cross-section, said contact-levers co
operating with contact-pins alternately brought
into e?icient sliding contact therewith. In order
to attain a reliable and intimate contact, the
free contact-levers are pivotally mounted atone
of their ends, while the other of their ends are
In the accompanying drawing I have repre
contact-device for electric master-clocks, Fig. '1
being a front-view of a contact-device including 5
main contacts, spark-extinguishing contacts, and
the electric circuits operated by said contacts,
Fig. 2 a section along line A—B of Fig. 1, Fig. 3
a front-view of my novel contact-device without
a spark-extinguishing circuit, the device being
shown in condition of rest, and Fig. 4 the contact
device shown in Fig. 3 in condition of making
the ' construction
shown in Figs. 1 and 2, the clockwork of the mas
ter-clock is provided with an arbor 4 rotated at a
constant speed by the clockwork and has an
insulating plate 2 mounted on plate I by means
of screws 3. On an extension of the arbor 4 pass
ing through the plate I, there is mounted an insu
lating tube 5 carrying the contact-disk 6. On so
the latter is mounted a contact-pin ‘I and on
either side thereof an insulated pin 8 and 9. To
the plate I of‘ the clockwork there is further
fastened an insulating bushing ill, a contact-bolt
ll being mounted in said bushing. The bolt H
forms the carrier of a sliding-spring l2, the free
connected with each other by means of a tension
end of said spring sliding on the periphery of a
spring keeping together both contact-levers.
contact-disk 6 in full contact therewith. The
insulating plate 2 further carries the binding 00 0
posts or terminals l3, l4, l5, l6 and H, the con
30 Moreover, all of said contact-levers are properly
' supported in such a manner that one contact
lever is being ?rmly pressed against its com
panion contact-member, in the present case a
contact-bar, whenever and as long as the other
35' contact-lever is in sliding contact with its com
panion contact-member, that is in'the present
case a contact-pin on a contact-disk.
In conse
quence of this improvement in the making of the
contact, the contact-resistances will practically
40 be reduced to nil, so that the electric circuit as
sociatedwith the contact will be able to operate
a greater number of secondary clocks than had
heretofore been possible. In addition to the afore
mentioned contact-levers which serve for the
45 making of the main contacts, there are further
provided two auxiliary contact-levers in parallel
to the former, said auxiliary levers serving to sup
press the formation of sparks at the main con
tacts. These auxiliary contact-levers are like
50 wise operated by a common tension-spring under
most reliable conditions with respect to making
the contacts for the spark-extinguishing circuit.
As the main and auxiliary contact-levers never
change their contact position, these contact
organs will warrant a permanently reliable op
tact-levers 22, 23, 24 and 25 being pivotally
mounted on said binding-posts or terminals by
means of set screws I8, l9, 2| and 20, respective
The terminal l5 extends in upward direc-
tion into a current-bar 26, which carries at its
upper end a contact-member preferably in the
form of a silver-plate 21. The contact-levers 22,
>23, 24 and 25 are re-inforced at their inner sur
faces by means of silver-straps 22a, 23a, 24a and
25a and more particularly at those surfaces at
which they come in contact with the contact-pin
1 serving for establishing the electric circuit for
the operation of the secondary clocks. The aux
iliary contact-levers 22 and 25 are arranged in
front of said main contact-levers 23 and 24 at
some distance therefrom and parallel thereto.
Swinging motion of said auxiliary contact-levers
is limited in’inward direction by ?xed stops 28 y
and 29 on the insulating plate 2. At the height
of the contactedisk 6 the inner distance between
said two auxiliary contact-levers 22 and 25 is
somewhat smaller than that between the main
contact-levers 23 and 24. From the contact-bolt
ll leads a connection 30 to the negative pole of
the battery 3i, the positive pole of the latter
being connected by a lead 32 with the terminal IS;
The connections 33 and 34 leading to the sec
ondary clocks to be operated by the master-clock
are connected to the terminals I4 and i6, respecé
tively. From the lead 33 is branched off a lead
36 connected to one terminal of a coherer-resist
ance 31, while the other terminal of the latter is
connected to the terminal I 3 by means of the lead
38. The lead 3A is connected by the lead 39 with’
the one terminal of a second coherer-resistance
40, the other terminal of the latter being con
nected to the terminal ill by the lead 4i. At the
head-end of the main contact-levers 233 and 2d
15 are provided insulating rollers 42 and 43 to which
a tension-spring 44 is fastened, said tension
spring keeping together said two main contact
levers atthis place. In like manner, insulating
rollers fit and (it are provided at the head ends of
20 said auxiliary contact-levers
and 2%, said in
sulating rollers serving as anchorages for the ends
of the tension-spring (ii.
The construction shown in Figs. Z-i‘and 4
from that shown in Figs. 1 and 2 solely therein
as well
25 that the auxiliary contact-levers
as the coherer-resistances ill and dd, which are
used as additional organs for spark-extinguish
‘ ing, are omitted.
The operation of the abovedescribed device is
30 described in the following, the main contacts ac
cording to Figs. 3 and 4 being described in in
operative condition. All parts of the contact
device are in the position shown in Fig. 3. ‘Upon
rotation of the contact-disk 6 in direction of the
35 arrow, ?rst the insulating ‘pin ii on said disk will
abut against the contact-lever’23 and press the
latter away from its position of rest on the con
tact-member 2i. Upon continued rotation of
said disk 6 the contact-pin ‘i thereon will come
in conductive connection .with the contact-lever
23 as shown in Fig. 4, thereby establishing an
electric circuit 3i, 3!], ll, i2, 3, ‘l, 23, i4,
34, I6, 24, 2i, 26, i5, 32, the secondary clocks
being now moved forward one minute.
making of the contact according to this invention
takes place without resistance which is due, on
the one hand, to the greater tension of the spring
44 ?rmly pressing the contact-lever 24 against
the front surface of the contact-member 21, and
on the other hand, to the sliding of-the contact
pin 1 in full contact along the contact-lever 23.
Upon further continued rotation of the contact
disk 6, now the insulating pin 9 abuts against the
contact-lever 23, causing the contact-lever 23 to
return into its inoperative position onto the con
tact-member 21, somewhat subsequently to the
interruption of the contact between the pin 1 and
the contact-lever 23. Subsequent contact be
tween the pin 1 and the contact-lever 24 is ef
fected in like manner to cause change‘ of. direc
tion of the current supplied to the secondary
clocks. In order-to suppress sparking at the con
tact, the contact-device is constructed as shown
in Figs. 1 and. 2. In this construction of the
contact-device the coherer-resistance 31, is con
nected across the terminals of the auxiliary con
tact l3 and of the main contact ll by way of the
leads 36 and 38; while the 'coherer-resistance 40
is connected across the terminals of the auxiliary
contact I1 and of the main contact I6 by way of
70 the leads “and II. Prior to the positionv of
operation, according to Fig. 4 which shows a con
struction of the contactIdevice' without spark
extinguishing means, the auxiliary contact-lever
22 which abuts against the pin 28 had been _
gripped by the contact~pin l and moved away
from'said pin 28. By this an electric circuit is
at ?rstpreliminarily established by way of the
coherer-resistance 31 and after some time the
contact-pin ‘i abuts against the main contact
lever 23 to fully establish the electric circuit.
During the operation of contacting both. con
tact-levers 22 and 23 will be in contact with the
pin 1.
Upon further rotation of the contact
disk 6 the main contact-lever 23 will come out
of contact with the pin l and ?rst interrupt the
circuit. The electric circuit, however, still re
mains closed by way of the coherer-resistance 3'!
and somewhat later the circuit is fully inter 15
rupted, when the contact-pin ‘l comes out of con
tact with the auxiliary contact-lever 22. During
the subsequent operation, the connection is made
in like manner by way of the other two contact~
and ‘.25 in cooperation with the coher» 20
er-resistance 6U. Owing to the employment of
contact-levers which are operating resil-l
iently one against the other, there will be se
cured a proper and uniform operating motion of
the contact-device, with the result that in the ‘
constructions shown in’ Figs. 1 and 2 sparking
will be efficiently suppressed at the contacts and
the latter remain free of the formation of oxide.
I claim:
1. A switch mechanism for electric master 3,0
cloclrs comprising, a disk having a conducting
surface and rotated at constant speed, means to
connect the conducting surface of said disk to a
source of current, a pair of rigid contact arms
pivotally mounted adjacent said disk, one upon
each side of the axis thereof,_a pin secured to
said disk in conducting relationship with the con
ducting surface thereof and engageable alter
nately with said contact arms, a tension spring
having its ends secured to but insulated from the
‘free ends of said arms and operable to swing said
arms toward the axis of said disk, and a'?xed
contact element arranged alternately to make
electrical contact with said contact arms and
form a stop for limiting the swinging movement
of said arms toward the axis of said disk.
2. In a switch mechanism for master-clocks,
the combination of a disk rotated at a constant
speed, means to connect one terminal of a source
of current to said disk, a ?xed contact, means to
connect said ?xed contact to the other terminal
of the source, a pair of pivotally mounted rigid’
contact arms, a single spring for swinging said
arms toward one another and into engagement
with said ?xed contact, and means on said disk
alternately engageable with said arms to move
said arms away from said ?xed contact against
the tension of said spring and thereafter to make
an electrical contact with the arm.
3. In a switch mechanism for master-clocks of 60
electrical clock systems, the combination of a
?xed contact, a. pair of pivotally mounted rigid
contact arms, resilient means to force said arms
into contact with said ?xed contact, and means
operable alternately to move said arms
contact with said ?xed contact, said means
prising insulating means for engaging said
while they are in close proximity to said
contact, and conducting means for completing
electrical circuits through said arms after the 70
.latter have been moved from contact with said
?xed contact.
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