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Патент USA US3083290

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March 26, 1963
E. UNGAR
3,083,280
TELETECHNICAL CIRCUIT COMPRISING RELAYS OR RELAY SELECTOR-S
Filed Nov. 10, 1958
Fig.1
2 Sheets-Sheet 1
March 26, 1963
E. UNGAR
3,083,280
TELETECHNICAL CIRCUIT COMPRISING RELAYS 0R RELAY SELECTORS
Filed Nov. 10, 1958
2 Sheets-Sheet 2
3,6832%
United States Patent
Patented Mar. 26, 1963
1
2
circuit of the type speci?ed above but where the said
3,083,280
drawbacks are eliminated.
TELETECHNICAL CERCUIT COMPRISING RELAYS
According to the invention this is obtained by the mov
OR RELAY SELECTORS
able contacts being constituted of, or permanently con
Ernest Ungar, Horsens, Denmark, assignor, by mesne as 5 nected with, conductors on the printed wiring.
signments, to Industris-eiskahet Kristian Kirks Telefon
fabriker A/S, Copenhagen, Denmark
Filed Nov. 18), 1958, Bar. No, 772,822
Claims priority, application Denmark Nov. 16, 1957
15 (Ilaims. (Cl. 200-104)
That the contacts are constituted by, or permanently
connected with, the said conductors, is to be so understood
that the contacts are either constituted by parts of the
conductors proper, or that on the said conductors, con
10 tact buttons or contact springs are secured, which at their
The invention relates to a telecommunication circuit
free ends carry the actual contacts. By the construction
comprising relays or relay selectors, for example, sub
scriber‘s circuits, connecting circuits, register circuits or
relay selectors having a multiple of the type, in which
according to the invention, the very important advantage
As is known, printed wiring consists of an electrically
is obtained that all relay contacts of the telecommunica
tion circuit together with the wiring, may be assembled
into a unit, and may be adjusted prior to the placing of
the driving systems of the relays. The wiring, on which
the movable contacts are placed, may be the same printed
conductive coating on a plate of insulating material. Such
wiring as the one on which the ?xed contacts are made,
wiring may by way of example be produced by printing,
the movable contacts being in such case constructed as
the connecting leads and ?xed contacts are placed on one
or more carrier plates in the form of printed wiring.
plating, spraying-on or bonding-on of a conductive ma 20 contact springs, one end of which is secured to the printed
terial, e.g., a metal, on the carrier, or by removal, for ex
wiring, e.g., by soldering or by means of connecting
ample, by etching or sand blasting of portions of a metal
rivets or a conductive adhesive, whereas the other end of
coating on the carrier.
the said springs, which serves for establishing contact, is
The known telecommunication circuit of the type in
situated opposite the said ?xed contacts on the wiring.
question is so designed that each relay contact is divided 25 The printed wiring, on which the movable contacts are
into two series-connected contacts, where the two ?xed
situated, may however also be an independent wiring, in
contacts of the double contact set thus formed are placed
that the movable contacts may by way of example be de
on the same carrier plate in connection with their asso
signed as cam-like portions of a plate having printed
ciated conductors of the printed network. The associated
wires, the cam teeth of said portions and the metal coat
two movable contacts are placed on a common contact 30
ing applied thereto being designed with su?icient elasticity
spring either each at one end of the contact spring or
side by side on the contact spring or, on two electrically
to act as contact springs. The word “printed” has here
the same scope as above in the term “printed wiring."
connected contact springs. Said contact spring or springs
A particularly advantageous embodiment is according
or, a number of such springs or pairs of springs is/ are
to the invention, obtained by the contacts being placed
together with a relay magnet assembled to make a unit, 35 in consecutive rows with constant spacing, and the con
which is screwed on to the carrier plate of the printed
tact springs for the make and break contacts being alike.
wiring, so that the movable contacts are placed in the
This construction involves different advantages with
correct position in relation to the ?xed contacts. Thus,
respect to the manufacture. The constant contact spacing
each connection is led from a ?xed contact on the car
simpli?es the production, the placing of the. contacts and
rier plate via a corresponding movable contact and one 40 the arrangement of the wires; only a single type of con
or ‘two contact springs to the subsequent movable contact
tact springs is required, and the assembling of the springs
and from there to another ?xed contact on the carrier
is the same no matter whether it is a make contact or a
plate.
break contact.
'
Several drawbacks are attached to this construction.
Especially in the ‘last mentioned embodiment, but never
Firstly, the assembling of the movable contacts {and the 45 theless also in other embodiments of the invention, it is,
relay magnet on the plate must be effected with the great
according to the invention, particularly advantageous
est accuracy in order to be sure that the contacts are
that the actuating member both for the make contacts and
placed accurately in the correct position in relation to the
the break contacts is constituted by toothed members
?xed contacts, and likewise the adjustment of the movable 50 having constant tooth spacing, where the teeth are re
moved in all places where no contact actuation shall take
place, whereby each contact can be made a make contact
or a break contact, alternatively, in dependence on the
point of ‘actuation of the tooth on the contact springs.
contacts cannot be effected until the unit is mounted on
the carrier plate.
Secondly, with a view to the function it must be con
sidered a drawback that two series-connected contacts
are to be used for each connection, in that the risk of 55 Thereby ‘an extremely simple process of production is
obtained, in that the actuating members may be pro
duced in long lengths which are cut off, eventually broken
off, into suitable lengths, the teeth being broken off ac
contact faults is thereby at least doubled.
Finally, it is obvious that the use of two movable con
tacts for each connection insteadot a single contact
means a considerable increase in costs.
The use of the printed wiring involves, however, in it
self such material advantages that it must be considered
of extremely great importance to make use of it within
the ?eld of telecommunication. Consequently, the inven
tion has for its object to provide a telecommunication
60
cording to directions given.
In another embodiment of the invention, the actuating
members ‘of the make contacts as well as of the break
contacts consist of rows of small rollers on two shafts, and
in the places where no contact actuation shall take place,
provision is made of spacing rollers having such small
diameter that in no position of the armatures they touch.
3,083,280
4
the contact springs whereby make or break contact is
obtained in dependence on the point of ‘actuation of the
rollers on the contact springs.
In this instance, prin
cipally uniform actuating members for the make and
break contacts are likewise concerned, since it is only
a part just as the driving systems associated with the
relays have been left out for the sake of clarity,
FIG. 2 shows the embodiment of FIG. 1 as viewed in
section at right angles to the plane of FIG. 1 parallel to
the contact springs shown therein and with a driving
system for a relay,
FIG. 3 shows a modi?ed embodiment of the relay por
the different placing of the members on the two shafts
which is decisive for the production of one or the other
tion of the circuit in the same sectional view as FIG. 2’,
type of contact.
FIG. 4 shows part of a modi?ed embodiment of the
In a further expedient, embodiment according to the
invention, the actuating members for the make contacts 10 circuit according to the invention having two carrier
plates in the same sectional view as FIGS. 2 and 3,
as well as the break contacts consist of small tubes having
FIG. 5 shows one of the carrier plates shown in FIG. 4}
uneven wall thickness on two opposed sides and being
FIG. 6 shows an embodiment of the telecommunica
assembled on a rod. Dependent on the position of the
tion circuit according to the invention in the form of a
tube the actuated contact establishes make or break
contact.
15 relay selector with the associated wiring multiple ass,
viewed from the side,
FIG. 7 shows a modi?ed embodiment of the relay,’
selector shown in FIG. 6,
the multiple contacts with their associated conductors on
FIG. 8 shows part of a carrier plate with contact
the printed plate change numerical sequence at every
second contact group or selector unit witha view to 20 springs for the relay selector shown in FIG. 7, and
If the telecommunication circuit comprises a relay
selector, it is, according to the invention, expedient that
FIG. 9 shows the carrier plate shown in FIG. 8 as
viewed from the other side.
of conductors. The contacts ‘of two neighboring units
In FIG. 1, l designates a carrier plate of a printed cir
may thereby be directly interconnected by means of con
cuit having a number of printed conductors 2, of which
ductors situated on one side of the carrier plate, while the
connections from each of the contacts of these two units 25 for the sake of clarity only a few are shown. Those of
the conductors 2 located at the side of the carrier plate
to one each of the two subsequent units are placed on
shown in the ?gure are fully drawn whereas those located
the other side of ‘the plate. If the contacts are designed
at the opposite side of the plate are shown in dotted
as contact rivets, these establish directly the necessary
lines. Connections between conductors at either side of
connection between the conductors on either side of the
carrier plate, and in ‘the case where no contact rivets are 30 the plate are according to the known and commonly
making multiple connections possible without crossing
used but e.g. the contacts are plated on the conductors,
or the conductors are directly used as contact-establish
used technique for printed circuits established through
holes in the plate as indicated by 3, for example, by
ting elements, the connection may be made round the
edge of the plate. In both cases, separate connecting
walls of the holes.
means of rivets or by conductive coatings on the side
The conductors 2 constitute together with par-ts of
members, e.g., rivets or holes with a conductive material 35
relays, with which they are connected, the telecommuni
for the purpose of establishing contact between ‘the con
cation circuit as used in various performances in the
ductors on either side of the plate, are avoided.
telecommunication plants.
According to the invention, conductors on the printed
On the printed conductors contact springs are secured,
plate may form common leads for the relay selector,
while its individual multiple contacts consist of springs, 40 of which FIG. 1 illustrates two embodiments, ‘namely,
the contact springs 4 and the contact springs 4'.’ Ordi
but it is also possible according to the invention to let
narily, only a single type of contact springs is used so
the conductors on the printed plate form individual con
that all of the contact springs in a given construction
tacts while contact springs ‘form common leads.
may by way of example by designed either as the contact
In a particular embodiment of the telecommunication
springs 4 or as the contact springs 4'. The contact
circuit according to the invention having a relay selector,
there is a maneuvering member at each cross point, i.e. 45 springs extend in parallel to each other across the carrier
plate 1 with their free ends projecting outside one edge
at the point ‘of contact between the common lead and
5 of the plate 1.
'
the individual multiple contact. The use of the separate
The
contact
springs
4
or
4’,
of
which
one
is
shown
in
maneuvering member affords advantages, in that the
sideview in FIG. 2, are each provided with a contact 6',
mounting and the connection thereof may be effected in
a very simple manner as a consequence of all of the 50 e.g. a contact rivet, and the conductor on the printed
circuit associated with each of these contact springs,
points of contact being placed on a'plane carrier, and this
i.e. the conductor with which the contact spring con~
further involves the advantage that the bar mechanism
cerned shall be able to make or break a connection, is in
otherwise used in the known relay selectors may be dis
pended with, that a great coupling speed is obtained,
and that at any rate within certain limits the choice as
to the size of the selector unit is free.
the vicinity of the edge 5 of the plate 1 designed with in‘
creased width, as will be seen in FIG. 1 with the designa
tion 7 on some conductors, where the associated contact
springs have been removed for the sake of clarity.
In this case it is possible by using two carrier plates
On these extended parts 7 there may be plated a special
with printed circuits on top of each other to double the
contact material, or a contact may be riveted or welded
capacity of the selector. In such case, two additional
vdriving'systems may be used for establishing the connec 60 on to said parts, but it is also possible, if desired, to use;
the extended part proper of the printed conductor as a.
tion to one or the other plate. ‘Further, in such case, a
common driving system is used at corresponding cross
points on the two plates.
According‘to the invention, it is particularly expedient
that the individual multiple contacts, the multiple con
nections, and the common leads are lying in parallel
planes, because by so doing an extremely simple con
contact and, if so, a precious metal should be used for‘
the conductors.
'
Thus, each contact 6 forms together with the associated‘.
contact part 7 on the printed circuit a set of contacts,
and a certain number of such con-tact sets placed side by
side constitute a contact system for a rela‘ , the contact
springs 4 concerned being operated by a common driving,
struction is obtained.
system.
,
In the following, the invention is explained in detail 70 FIG. 2 shows such driving system in the form of a
with reference to the drawing, where
relay magnet 8 with associated armature 9 which by ‘
FIG. 1 shows diagrammatically part of an embodi
means of an angular piece 10 and an insulating interme-'
ment of the telecommunication circuit according to the
diate layer is in a manner not shown secured to the car
invention in the form of a carrier plate having a printed
rier plate 1 on the same side as that where the contact
circuit with fixed and movable relay contacts, of which 75 springs are situated.
3,083,280
6
From FIG. 2 it will be seen that the contact springs
4 are provided with a bent-out lug 12 at a distance from
the free end.
On the armature 9 there is secured a driving member
13 of insulating material. The length of this member,
i.e., the dimension at right angles to the plane ‘of FIG. 2,
is dependent on the number of contact sets associated
In FIGS. 4 and 5 there is shown part of a circuit ac
cording to the invention, where two carrier plates 30
and 31 having printed circuits are used. One of these
carrier plates is shown in FIG. 5.
On this carrier plate 30 there are a number of printed
conductors 32 and a row of contact springs 33.
These
contact springs are, however, not as, is the case with the
embodiments described above, separate members which
with the relay concerned.
The driving member 13 has two operating edges, name
in one way or the other are connected with the circuit,
ly, an edge 14 projecting inwardly over the free ends of 10 but they are directly constituted by narrow ?ngers pro
the contact springs 4, and an edge 15 projecting inwardly
duced at the edge of each plate, for example, by punching
over the said lugs 12 of the contact springs. The two
edges 14 and 15 are toothed so that there is a tooth oppo
site each contact spring, and they are so designed that
the spaces between the lugs so that each contact spring
extends directly from the carrier plate as an integral part
of the same, and likewise the printed conductors con
they may easily be broken 011. During the process of 15 tinue directly on the contact springs formed by the carrier
plate. Out of regard to mechanical causes, namely, with
manufacture, a breaking-oft‘ of the tooth is eitected so
as to leave opposite each contact spring either a tooth
-on the edge 14 or a tooth on the edge 15. It will be seen
ment of leads, it may be expedient that the conductive
that a contact set will in the ?rst case work as a break
contact and in the second case as a make contact and,
tact springs 33.
a view tothe spring rigidity, as well as to the arrange
coating is retained or placed on both sides of the con
consequently, the design of the contact springs 4 is quite
‘In the case that the contact springs 33 are to constitute
independent of whether they are to be used for a make
the movable contact springs, the carrier plate 31 in FIG.
contact or a break contact, for which reason the two
4 may be designed with contacts in a manner correspond
ing to the one indicated in connection with FIGS. 1 and
diiferent embodiments may ‘be made completely alike.
This involves considerable advantages with respect to
manufacture. By way of example, the assembling of
the springs on the printed wiring may be effected in the
2, but it is also possible to design the carrier plate 31
with punched lugs for forming the contact springs in the
same manner as the carrier plate 30, as shown in FIG. 5.
In the embodiment shown in FIG. 4, the carrier plate
way that a certain number of contact springs, eg all
31 is supposed to be designed with contact springs 34
contact springs for one and the same carrier plate, are
made in one piece with a material strip at the end, so 30 like the carrier plate 30 but, as will be seen from the
?gure, somewhat shorter than the contact springs 33.
that all of the contact springs as a constructive unit may
The required spring tension is provided by the two plates
be brought in place in relation to the printed circuit and
the individual contact springs are secured to the respec
30 and 31 being ?xed under a certain angle with a view
to obtaining pressure opposite the direction of movement
tive leads by an appropriate soldering process, whereupon
the said material strip is cut off. Of the two embodi
ments of the contact springs shown in FIG. 4, contact
of the armature.
springs 4 are soldered to printed conductors on the side
of the plate 1 where the springs are situated, whereas
the contact springs 4' with bent ends are extended through
?anges of a U-shaped bar, and the contact actuation is
obtained by means of an actuating lug 36 secured to the
varmature 9 of the relay. There is such an actuating lug
The contact springs 33‘ and 34 are supported by the
36 for each contact set in the relay, and by bending of
apertures in the plate 1 and connected with conductors
the lugs is determined whether the con-tact set concerned
situated on the other side of the plate.
is to form a make contact or a break contact.
In ‘FIG. 2, a lead 16 is shown which connects the
In the ?gure there is shown a make contact in that
winding of the magnet 18 with one of the conductors of
the lug 36 will actuate the contact spring in the direction
the printed circuit. In the embodiment shown, the con
nection is provided by means of a soldering lug 17, which
towards the contact spring 33 by armature attraction. A
is shown in FIG. 1. The connection may by way of ex
break contact is obtained by the actuating lug 36 being
ample also be provided by means of soldering or riveting
bent forwardly so as to pass freely during the armature
directly to the conductor concerned.
movement by the end of the contact spring 34 whereby
The circuit in question may, for example, be connected
an vactuation of the contact spring 33- away vfrom the
to a rack cable by means of a ?at multiple plug of known 50 contact spring 34 will take place.
type. For this purpose, conductors on the printed cir
By this embodiment the advantage is obtained that
cuit in the embodiment shown have been extended out
one avoids connecting contact springs with the carrier
to the end-edge 18 of the plate 1, where the conductors
plate, because the contact springs are integral with said
are made wider and for the purpose of securing a reliable
plate, ‘and this ‘advantage is obtained without the necessity
contact, taken round the edge and on to the other side 55 of using two series-connected contact sets.
of the plate so as to obtain a double-sided contact.
FIG. 3 illustrates an embodiment which as far as the
‘ In the following some embodiments will be described
of the telecommunication circuit according to the inven
placing of the driving system in relation to the carrier
tion comprising relay selectors.
plate 11 is concerned, corresponds to that shown in FIG.
FIG. 6 shows in side-view such circuit, namely, a 20
2, but the contact springs of the relay, which in FIG. 3 is 60 line selector unit comprising 10 double contact units 40
designated by 26, is in this embodiment a wire spring,
designed with two carrier plates 41 and 42 with mulitple
one end of which is secured to a conductor on the carrier
conductors and relay contacts designed, for example, as
plate 1, while a bending 27 in the vicinity of the other
indicated in connection with one of the embodiments de
end serves as a carrier of a contact. The relay is pro
scribed above, and so that each plate is common 'for one
vided with two sets of actuating members 23 and 29, of 65 of all of the double contact units.
which the former are operative when break contacts
Of the units, mainly their contact actuating members
are concerned, and the latter when make contacts are
are shown in end-view. IEach double unit has its con
concerned.
tact actuating member and associated driving member,
From the form of contact springs shown in FIG. 1 it
e.g., a relay magnet, ‘and for the sake of simplicity the
will be seen that double contacts are used as is nowa
?gure only shows a few marked '43.
days nearly always the case within the ?eld of telephone
The movable contacts associated with the plate 41 are
technique. Such double contact may also be obtained in
marked a, b, c, and d. Corresponding contacts for the
the case of wire springs as shown in FIG. 3 by using two
carrier plate 42 are provided, but they cannot be seen in
alike interconnected wire springs placed closely side by
side.
~
the ?gure.
75
The connection to one or the other of the two plates
3,088,280
8
41 and 42 is established by means of two additional con
tact units 44.
,
As Will be seen in the ?gure, the sequence of the con
tacts of two neighbouring units are reversed in relation
to each other, the connection of corresponding contacts
of two units may, therefore, be provided all on the same
side of the plate without being crossed. The connection
to the subsequent unit may then in a corresponding man
ner ‘be placed on the other side of the plate and so on,
of make contacts, the rollers on the other of said shafts
engaging only contact springs of break contacts.
4. A telecommunication circuit comprising a number
‘of relays having ?xed relay contacts and movable relay
contacts, connecting leads, a carrier plate on which said
?xed relay contacts {and said leads are positioned as
printed wirings, said movable contacts being constituted
by conductors of printed wirings, the actuating members
for the make contacts as well as for the break contacts
whereby an extremely simple arrangement of leads is ob 10 comprising small tubes having uneven wall thicknesses
tained. If contact rivets are used, they may as well serve
on two opposed sides, said tubes being assembled on a
for establishing connection between the conductors on the
‘two sides of the plate. Otherwise, the connection between
conductors on the two sides of the plate may be estab
lished over the edge of the plate.
FIGS. ,7—9 show by way of example part of an embodi
ment of a relay selector built-up according to a principle
similar to that indicated in FIG. 6 and comprising mov
able contact springs designed as the embodiment shown
in FIG. 5.
FIG. 7 shows two carrier plates 51 and ‘52. placed one
above the other at some distance from each other in the
rod, some of said tubes facing the springs of make contacts
with one of said two opposed sides, the other of said
tubes ‘facing the springs of break contacts with the other
of said two opposed sides.
5. A telecommunication circuit comprising a relay se
lector, groups of ?xed multiple relay contacts, movable
relay contacts, a carrier plate on which said ?xed relay
contacts and connecting leads associated with said ?xed
contacts are positioned as printed wirings, said movable
contacts being constituted by conductors of printed wir
ings, each one of said multiple relay cont-acts in one of
same manner as the plates ‘41 and 42 in FIG. ‘6. These
said groups corresponding to one of said multiple relay
plates 51 and 52 bear printed circuits with contacts along
contacts in each other one of said groups, corresponding
their edges shown at the left-hand side of the ?gure, 25 contacts being disposed in same sequence in each of said
which contacts ‘co-operate with movable contacts designed
groups but in opposite directions of sequence in each two
as described in connection with FIG. 5, the said ‘movable
adjacent ones of said groups, two adjacent contacts be
contact springs 53 and 54 being made by punching car
longing to each one of two adjacent groups being corre
rier plates having a printed circuit. FIGS. 8 and 9 are
sponding contacts.
respectively a top-view and a bottom-view of part of the
6. A telecommunication circuit comprising a relay se
Contact springs 53 which are made integral with the car
lector, groups of movable multiple relay contacts, ?xed
rier plate 55 having printed conductors extending un
‘relay contacts, a carrier plate on which said ?xed relay
brokenly from one contact spring to another over the non
contacts and connecting leads associated with said ?xed
split part of the carrier plate. The contacts in a selector
contacts are positioned as printed wirings, said movable
unit are marked a, b, c, and d, and it will be seen that,
contacts being constituted by conductors of printed wir
like indicated in connection with FIG. 6, they lie in re
ings, each one of said multiple relay contacts in one of
versed sequence in two neighbouring units, the correspond
said groups corresponding to one of said multiple relay
ing contacts of which ‘are thus connected Without cross
contacts in each other one of said groups, corresponding
ing of the conductors, and each of said units are corre
contacts being disposed in same sequence in each of said
spondingly connected with a subsequent unit on the other 40 groups but in opposite directions of sequence in each two
side of the plate.
adjacent ones of said groups, two adjacent contacts .be
I claim:
longing to each one of two adjacent groups being corre~
1. A telecommunication circuit comprising a number
sponding contacts.
7
of relays having ?xed relay contacts and movable relay
7. A telecommunication circuit comprising a relay se~
contacts, connecting leads, a carrier plate on which said
lector, ?xed multiple relay contacts with associated multi
?xed relay contacts and said leads are positioned as 45 ple leads, movable relay contacts with associated common
printed wirings, said movable contacts :being ?xed con
leads, a carrier plate on which said ?xed relay contacts
nected with conductors of printed wirings, the actuating
and their said associated leads are positioned as printed
members for the make contacts as well as :for the break
wirings, said movable contacts and their said associated
contacts comprising a row of small rollers on two shafts, 50 lead being ?xed connected with conductors of printed
the rollers on one of said shafts engaging only contact
springs of make contacts, the rollers of the other of said
shafts engaging only contact springs of break ‘contacts.
wirings, eachone of said multiple relay contacts in one
of said groups corresponding to‘ one of said multiple
relay contacts in each other one of said groups, corre
2. A telecommunication circuit comprising a number
sponding contacts being disposed in same sequence in
of relays having ?xed relay contacts and movable relay 55 each of said groups but in opposite directions of sequence
contacts, connecting leads, a carrier plate on which said
in each two adjacent ones of said groups, two adjacent
?xed relay contacts and said leads are positioned as
contacts belonging to each one of two adjacent groups
printed wirings, said movable contacts being ?xed con
being corresponding contacts.
'
nected with conductors of printed wirings, the actuating
8. A telecommunication circuit comprising a relay
members for the make contacts as well as for the break 60 selector, movable multiple relay contacts with associated
contacts comprising small tubes having uneven wall thick
nesses on two opposed sides, said tubes being assembled
on a rod, some of said tubes facing the springs of make
contacts with one of said opposed sides, the other of said
tubes facing the springs of break contacts with the other
of said two opposed sides.
3; A telecommunication circuit comprising a number
of relays having ?xed relay contacts and movable relay
multiple leads, ?xed relay contacts with ‘associated com
mon leads, a carrier plate on which said ?xed relay
contacts and their said associated leads are positioned as
printed wirings, said movable contacts and their said
associated leads being ?xed connected with conductors of
printed wirings, each one of said multiple relay contacts
in one of said groups corresponding to one of said multi
ple relay contacts in each other one of said groups, cor
contacts, connecting leads, a carrier plate on which said
responding contacts being disposed in same sequence in
?xed relay contacts and said leads are positioned as 70 each of said groups but in opposite directions of sequence
printed wirings, said movable contacts being constituted
in each two adjacent ones of said groups, two adjacent
by conductors of printed wirings, the actuating members
contacts belonging to each one of two adjacent groups
for the make contacts as well as the break contacts
comprising a row of small rollers on two shafts, the
being corresponding contacts.
9. A telecommunication circuit comprising a relay se
rollers on one of said shafts engaging only contact springs 75 lector, groups of ?xed multiple relay contacts, movable
3,083,280
10
relay contacts, a carrier plate on which said ?xed relay
contacts and connecting leads associated with said ?xed
contacts are positioned as printed wirings, said movable
said groups but in opposite directions of sequence in each
two adjacent ones of said groups, two adjacent contacts
belonging ‘to each one of two adjacent groups being cor
contacts ‘being constituted by conductors of printed wir
responding contacts.
ings, each one of said multiple relay contacts in one of 5
said groups corresponding to one of said multiple relay
contacts in each other one of said groups, corresponding
contacts being ‘disposed in same sequence in each of
said groups 'but in opposite directions of sequence in each
two adjacent ones of said groups, two adjacent contacts 10
belonging to each one of two adjacent groups being cor
responding contacts.
10. A telecommunication circuit comprising a relay se
lector, groups of movable multiple relay contacts, ?xed
relay contacts, a carrier plate on which said ?xed relay
contacts and connecting leads associated with said ?xed
cont-acts are positioned as printed wirings, said movable
contacts vbeing constituted by conductors of printed wir
rings, each one of said multiple relay contacts in one of
said groups corresponding to one of said multiple relay 20
contacts in each other one of said groups, corresponding
contacts being ‘disposed in same sequence in each of
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,133,787
2,410,136
2,454,060‘
2,616,994
2,682,643
2,790,875
2,800,552
Babcock _____________ __ Mar. 30,
Vincent ______________ __ Oct. 29,
Hegy _______________ __ Nov. 16,
Luhn ________________ __ Nov. 4,
Tlhias _______________ __ June 29,
Bancroft _____________ __ Apr. 30,
Durant ______________ __ July 23,
1915
1946
‘1948
1952
1954
1957
*1957
2,853,564
2,853,565
Gahagan ____________ __ Sept. 23, 1958
Arthur et al. _________ __ Sept. 23, 1958
2,866,030
Wir-th _______________ __ Dec. 23, 1958
2,906,838
2,931,871
Deighton ____________ __ Sept. 29, 1959
Dowds _______________ __ Apr. 5, 1960
762,999
Great Britain __________ __ Dec. 5,, 1956
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