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Патент USA US3086095

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April 16, 1963
Filed July 9, 1959
3 Sheets-Sheet 1
April 16, 1963
Filed July 9, 1959
3 Sheets-Sheet 2
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April 16, 1963
Filed July 9, 1959
3 Sheets-Sheet 3
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United States Patent 0
Patented Apr. 16, 1963
FIG. 1 shows a sealed-in or protective tube contact
Alfred Palm, Munich, Germany, assignor to Siemens &
Halske Aktiengeseilschaft Berlin and Munich, a cor
FIG. 2 represents in perspective view parts of a coordi
nate selector according to the invention;
FIG. 3 illustrates a contact set comprising a plurality
of contacts forming a structural unit;
FIGS. 4 and 5 indicate an arrangement of contact sets
with the contacts per set arranged so that the ends of the
contact springs are disposed in the outline of a parallelo
This invention is concerned with a coordinate selector 10 gram and individually parallel to a line thereof which
switch comprising electromagnetically actuated contacts.
extends in parallel to a coordinate direction of the selector;
Included among such selectors are socalled relay cou
pling boards having at each crossing point an individual
FIG. 6 shows a circuit based upon the structure accord
energizing coil for the actuation of the contact set which
ing to the invention.
bridges the corresponding crossing point. Decoupling
The coordinate selector switch as illustrated in FIG. 2
recti?ers are connected in series with these energizing
has an interior structure comprising a plurality of columns,
poration of Germany
Filed .luly 9, 1959, Ser. No. 825,975
Ciaims priority, application Germany July 23, 1958
11 Claims. (Cl. 179-4754)
coils so as to energize, upon activation of two mutually
only one column being shown to keep the drawing simple.
crossing rows (line and column), only the energizing coil
disposed at the crossing point. The holding of closed
sets 1, consisting respectively of four sealed-in contacts.
Within the illustrated column, there are individual contact
contacts is effected by means of holding coils which are, 20 Each of these contact sets is surrounded by an energizing
just as the energizing coils, individual to the respective
crossing points. These structures accordingly require a
considerable number of individual coils and, generally
coil 2 which is individual thereto, energization of such
coil causing operative actuation of the contacts of the cor
responding contact set. Actuated contacts belonging to
speaking, the resulting type of selector has consequently
this column are held in actuated position by the actuation
been used only in the case of relatively small communica 25 of a holding coil 3 which embraces the entire column.
tion systems.
The magnitude of energization of the holding coil 3 is
Socalled cross-coil selectors, constituting a variant of
just sufficient to hold actuated contacts in actuated position
the relay coupling board, are constructed of mutually
but insu?icient to cause operative actuation of other
crossing line coils and column coils, one such coil always
embracing the entire corresponding line and column, re 30 Each contact set 1 forms a structural unit as shown
spectively. Upon energization of two such mutually
separately in FIG. 3. The contact set comprising four
crossing coils, there occurs at the crossing point a summa
sealed-in contacts, is held together by blocks 4 and 5
tion of the corresponding ?uxes, serving for the actuation
made of insulating material disposed at the opposite ends
of a contact set disposed at the crossing point. These
thereof. The insulating material may be any desired and
contact sets are constructed of contacts which carry the 35
magnetic ?ux serving for the actuation thereof. Among
uitable thermoplastic material or a hardenable mass.
such contacts are primarily sealed-in contacts, also referred
From ‘the blocks 4 and 5 extend respectively the terminal
ends 6 of the contact springs. The block 5 has a special
to as protective tube contacts. An actuated contact may
soldering tab 7 serving as a terminal for one side of the
be held in actuated position either by the line coil or by
energizing coil. The energizing coil (see FIG. 2) can
the column coil; however, in the absence of very close 40 be placed upon the contact set either subsequently or
tolerances, this may easily result in erroneous actuation
prior to providing the connection with the blocks 4 and 5.
of other contacts, and individual holding coils may there
The block 4 has a recess formed therein for receiving a
fore be provided which extend in each case along an entire
decoupling recti?er 8, operating in known manner, one
line or column of the selector. The latter construction
the terminals of which extends to the soldering tab 9.
requires particular guides for the magnetic ?ux, namely, 45 The other terminal is formed by the soldering tab 22 to
magnetic shunts for the contacts carrying the magnetic
which is connected the other side of the energizing coil.
flux, so as to prevent, responsive to energization of a
Accordingly, there is established a connection from the
holding coil and the line or column coil crossing such
soldering tab 7 to the energizing coil and from there to
holding coil, operative actuation of the contact set dis 50 the soldering tab 22 and thence by way of the recti?er 8
posed at the crossing point.
to the soldering tab ‘9.
The invention proceeds from the principles noted above.
The contact sets such as the set 1 may be secured or
It is concerned with a coordinate selector in which indi
mounted in the coordinate selector in various ways. FIG.
vidual features of known coordinate selectors are com
2 shows two particularly advantageous arrangements. At
bined so as to obtain, by the use of further structural
65 the side facing away from the observer of the coordinate
means, a very compact and, so far as fabrication is con
cerned, a simple structure whose operational properties,
which are determined by the magnetic phenomena, can
be easily controlled.
selector switch, the contact sets 1 are inserted in recesses
or cutouts .10 formed in a bar 11. The shape of these
recesses or cutouts is determined by the structure of the
respective contact sets. The individual contacts may be
The coordinate selector according ‘to the invention pro
disposed either directly in the cutouts 10, without requir
vides for each contact set an energizing coil and a holding 60 ing special blocks, or the cutouts may be matched to the
coil extending in one coordinate direction common to a
column of contact sets, the columns of this coordinate
shape of the blocks. On the side facing the observer of
the coordinate selector, the blocks 4 serve for the spaced
disposal of the contact sets simply by the superposed
direction being mutually separated by magnetizable parti
tion plates and being mutually shielded, the magnetizable
positioning thereof.
plates extending approximately to adjacent the terminal 65 The above described column-wise construction, consist
ends of the contact springs and serving at the same time as
ing of the superposed contact sets 1 with the energizing
magnetic return paths for the ?ux leaving the contact
coils 2, holding coil 3 and bar 11, is delimited on both
sides by respective magnetizable plates extending over the
The foregoing and further objects and features of the
entire column and in depth from the frontal end of the
invention will appear from the description which will be 70 contact sets to the rear end thereof. The drawing FIG. 2
rendered below with reference to the accompanying draw
shows only the magnetizable plate 12 extending at the left
ings. In the drawings,
of and adjacent to the illustrated column of contact sets
and secured together, for example, by screws, welding, or
other suitable means. The object of this plate 12 is to
mutually shield the contact sets disposed along both
of its sides, thus preventing a magnetic excitation within a
ple wiring in the present case comprising bare linearly ex
tending wires 17, the rhombical positioning of the contact
springs giving ample space for such arrangement of the
multiple wiring. The soldering tabs 7 (see also FIG. 3),
column of contact sets to affect a neighboring column.
The magnetizable plate also operates as a magnetic re
turn path for the magnetic ?ux leaving the ends of the
for connecting the energizing coils, disposed at the same
ends of the contact sets (rear end in FIG. 2) are similarly
interconnected by bare wires 18 extending in parallel to
the multiple wiring 17.
of the arrangement considerably, that is, relatively low
At the other side or end of the contact sets (front as seen
magnetic excitation will su?ice for obtaining the desired 10 in FIG. 2) extends the column multiple wiring shown in
FIG. 5, such multiple wiring likewise consisting of linear
contact springs. This return path increases the sensitivity
The remaining columns are constructed just like the
column shown in H6. 2 and described ‘above. in the re
sulting structure, the individual columns are enclosed
within magnetizable plates 12 extending along each side
thereof. Two such plates accordingly act with respect to
the column enclosed thereby, as a magnetic return path,
whereby each plate forms the return path for the
columns extending along its respective sides-excepting
bare wires 19. The terminal ends 6 of the contact springs
(see FIG. 3) are on this side in the corresponding coordi
nate direction normally in alignment; in order to permit
use of the linearly extending bare multiple wires 19, these
terminal ends are bent, as for example, the top pair of
contacts of each set being bent to the right and the bottom
pair of each set being bent to the left, which is easily
done since they extend at this end with their ?at sides in
of course the outermost plates each of which acts only 20 parallel to the corresponding coordinate direction (column
with respect to the column extending adjacent thereto.
direction). FIG. 5 also shows the soldering tabs 9 for the
The various columns of contact sets and intervening
decoupling recti?ers 8 (see also FIG. 3), which are like
magnetizable plates of the coordinate selector according to
wise interconnected by means of linearly extending blank
the invention are inserted into 'a frame 13‘ and secured
wires such as 20.
The particular advantage of the above described con
therein by brackets 14 punched respectively ‘from the top
and bottom frame walls and ‘forming guides for the inser
tion of units comprising respectively a magnetizable plate
12 and a column extending adjacent thereto. These units
are terminated at the opposite ends by members 15 the
struction of the contact sets resides in the possibility of
using bare wire multiple wiring extending linearly through
the structure, thereby eliminating the otherwise custom
ary band or ribbon cables with soldering ears extending
shapes of which are ?tted to the contact sets disposed ad 30 therefrom. Attention is directed to the fact that the
multiple wiring extends on each side of the coordinate
jacent thereto and to the respective top and bottom frame
walls. The members 15 are cross-sectionally triangular
selector switch in a single direction only, that is, without
any crossings within a multiple, thus resulting in a very
for reasons of the con?guration of the contact sets which
will be presently explaned more in detail. Each member
15 has a guide groove formed therein for receiving the
respective guide and securing bracket 14.
The outer vertically extending walls of the frame 13
form at the same time the magnetic return path plates for
the outermost columns of contact sets.
compact and simple arrangement.
The electrical circuit for the construction according to
the invention, as shown in FIG. 6, is limited to portions
comprising four crossing points. The rows are formed
by the multiple wiring 17 and the columns by the multiple
wiring 19'. At the crossing points of these multiples are
The subdivision of the structure into individual structural 40 disposed the contact sets formed by individual scaled-in
contacts 21. The actuation of these contact sets is ef
units, namely, the contact sets with the energizing coils
fected by means of energizing coils 2 which are respectively
and the metallic plates with the columns, constitutes a
in series connection each with a decoupling recti?er 8.
considerable advantage and convenience in connection with
The energizing coils 2 are connected to current by way of
manufacture, permitting particularly a subdivision of the
multiple conductors 18 and 20‘. Each column has a
assembly into individual easily executed operations. The
use of structural units arranged in columns provides more
over for enlargement or increase of the capacity of the
selector, merely requiring :simple addition of further
columns of contact sets to an existing structure to etfect
the desired increase. Such increase may be considered
in advance by making the frame large enough to provide
space for units that might have to be added subsequently.
The individual contacts within the contact sets may be
disposed in particular manner so as to permit the use of
linearly extending bare wires for the multiple wiring there
of. This particular arrangement consists in positioning
the contacts in each set so that the outer or terminal ends
of the contact springs are disposed at the four corners of ‘a
common holding coil 3 ‘for holding actuated contact sets
in the respective column in actuated position.
Changes may be made within the scope and spirit of
the appended claims which de?ne what is ‘believed to be
new and desired to have protected by Letters Patent.
I claim:
1. A coordinate switch having a plurality of columns
of contact sets disposed side by side and extending in
one coordinate direction, each column including a plu
rality of sets of contacts, each contact set having a plu
rality of individual electromagnetically actuated contacts
disposed respectively at crossing points of the coordinates
of the switch, each individual contact being of the sealed
in type having contact springs carrying the magnetic flux
parallelogram with corresponding contacts of the respec
tive sets arranged in respective lines extending parallel to a 60 required for the operative actuation thereof, the terminal
ends of said contact springs extending outwardly of the
coordinate direction of the selector switch and particularly
sealed-in portions thereof, comprising an energizing coil
in the direction of the metallic return path plates.
embracing each set of contacts and being individual there
The above indicated arrangement is illustrated in FIGS.
to, a holding coil common to the contact sets disposed
4 and 5, showing in schematic manner portions of the co
ordinate selector according to the invention, namely, 65 in a column and embracing such contact sets, mag
three successive columns and within these columns two suc
netizable partition plate members disposed respectively
cessive rows. FIG. 4 shows the contact sets as seen from
between adjacent columns of contact sets for separating
and for mutually shielding said columns of contact sets,
the rear of the coordinate selector illustrated in FIG. 2,
and FIG. 5 shows the same contact sets as seen from the
said partition plate members extending, in a planar form,
There are in the illustrated example four contacts in
each contact set, the terminal ends 6 of the individual
from approximately one terminal end of each contact
set of adjoining columns to the opposite ends of such sets,
and in transverse direction extending over the length of
contacts (see FIG. 3) being positioned rhombical, thus
giving the possibility to use for the multiple wiring which
extends perpendicularly to the contact springs, the multi
the column, said plate members also serving as magnetic
return path means for the flux leaving said contact springs.
2. A coordinate switch according to claim 1, further
comprising a block of insulating material for securing
the contacts of each set in position.
3. A coordinate switch according to claim 1, further
comprising bars extending in parallel with the respective
holding coils, said bars having cutouts formed therein for
receiving and securing the respective contact sets at one
end thereof.
4. A coordinate switch according to claim 3, wherein
parallelogram which extends parallel to the coordi
nate direction of the switch coinciding with the direc
tion of said magnetizable partition plate members, where
by none of such adjacent terminal ends of each set is in
alignment in either coordinate direction.
10. A coordinate switch according to claim 9, further
comprising bare wire wiring extending linearly along the
respective coordinate directions and constituting the
multiple wiring for the contacts of said contact sets.
said bars are disposed between respective pairs of said
11. A coordinate switch according to claim 1, further
magnetizable plate members.
comprising a decoupling recti?er for each contact set,
5. A coordinate switch according to claim 1, further
means for interconnecting one terminal of said recti?er
comprising a block of insulating material for securing
the contacts of each set in position, the blocks of a plu
rality of contact sets being stacked together and being
disposed between respective pairs of said magnetizable
plate members.
6. A coordinate switch according to claim 1, ‘further
comprising a block of insulating material for securing
with one terminal of the energizing coil for the respec
tive contact set, the other terminals for said energizing
15 coil and said recti?er extending respectively from op~
posite ends of the corresponding contact sets, bare wire
wiring interconnecting said other terminals and extending
linearly along the sides of said switch, and further bare
wire multiple wiring interconnecting the terminal ends of
the contacts of each set in position, a recess being ‘formed
in each block ‘for receiving a decoupling recti?er, and 20 the contact springs of said contact sets and extending
linearly in parallel with said ?rst named wiring.
a decoupling recti?er disposed in said recess.
7. A coordinate switch according to claim 1, further
References Cited in the ?le of this patent
comprising a frame for receiving said magnetizable plate
members with said columns of contacts sets disposed
therebetween which are inserted into said frame.
8. A coordinate switch according to claim 7, further
comprising means in said frame for guiding the insertion
of said named parts.
9. A coordinate switch according to claim 1, wherein
the contact springs of each contact set are positioned with 30 2,925,471
adjacent terminal ends thereof disposed at the four corn
ers of a parallelogram with corresponding contacts of
the respective sets extending parallel to a line of the
Ellwood et al. ________ __ Jan. 16,
Lienzen ____________ __ Dec. 31,
Horton ______________ __ Aug. 10‘,
Stibitz ______________ __ Oct. 12,
Licht ________________ __ Feb. 16,
McGuire et al. _________ __ Ian. 24,
Nitsch ______________ __ May 9,
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