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Патент USA US3089021

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May 7, 1963
H. v. ALEXANDERSSON
3,089,011
CODE RELAY SELECTOR
Filed May 19, 1960
2 Sheets-Sheet 1
IL\ \ Ivil ’);
72
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?rroR/wsms
May 7, 1963
H. v. ALEXANDERSSON
3,089,011
CODE RELAY SELECTOR
Filed May 19, 1960
2 Sheets-Sheet 2
1 N VENTOR.
WALD VALDEMAP ALEMNDEES SON
BY
A 1- TokNE YS
United States PatentO?ice
1
3,089,011
CQDE RELAY SELECTOR
Harald Valdemar Alexandersson, Lidingo, Sweden, as
signor to 'I‘elefonaktiebolaget L M Ericsson, Stockholm,
Sweden, a corporation of Sweden
Filed May 19, 1960, Ser. No. 30,313
Claims priority, application Sweden June 2, 1959
5 Claims. (Cl. 200—104)
3,089,01 l
Patented May 7, 1963
2.
is pivotally mounted on a shaft' 9 extending along the
length‘ of the selector. A number ofmovable code
bars 12 are extending along the'length of the selector.
These bars consist'of thin steel strips which attheir upper
edgcsr are provided with grooves according to a particular
code system which in known manner for each connect
ing relay is arranged in such away that the grooves in all
the bars- in front of a particular lifting bar‘coincidewith
a certain predetermined position on the bars. The bars
The invention relates to cross bar switch arrangements‘ 10 are controlled by a number of- not shown code relays.
‘In the'embodirnentof FIG. 4 shown in British Patent»
known as code relay selectors. An arrangement of this
kind is mainly characterized by anumber of, for example
ten, connecting magnets with associated armatures,
mounted in a row on a common mounting plate, andby .a
code system comprising bars disposed’lengthwise along
the connecting relays, which bars at one lengthwise edge‘
are provided with grooves, into which lifting rockers
may engage. The lifting“ rockers selected by thecode
system are then lifted‘by the armature and-actuate the
832,865 the armature actuates-directly the lifting rockerv
which thereby in its turn actuates the associated lifting
bar. With the construction nowproposed, the armature
3'which is mounted lengthwise: along the front-edge 4 of
the mounting platev 2, is=by-means>of a. link,5 connected
to a lifting ironstrip 6. Said lifting strip is. extending.
perpendicularly to the plane of the drawing along the'
length of all‘the lifting rockers 7, for example. .17, asso-v
20 ciated with anarmature; The‘ lifting strip 6 is mounted.
associated‘contacts of ‘a multiple. More speci?cally, there
ona shaft 8 and pivots :about this .shaft'when. the arma-.
is known a code relay selector, where the contacts are
ture; is moving; - The;lifting. rockers 7 that are mounted
actuated by the armature in its released position, that is,
on the. shaft‘ 9 by means of‘anelongatedzopening 11,
when the magnet is demagnetized. With such a construc~
are: keptlpressedpdownwardly by means? of .1 individual
tion the current consumption decreases as the magnets do
not require any holding current during a speech connec 25 springs’ 10 so that the- upper edgeof the oval opening.
abuts against the shaft,9.T This applies'toalLthe' posi
tion. The saving achieved in this manner isconsiderable
tions showniin FIGS. 1-3 but not to the position accord
and may reach about 30% of the current consumption
ing, to FIG. 4. Owing to the- action. of the springg10r,
of the whole exchange.
the lifting ,rockers'also tend'tomove in vclockwise direc
Said construction has the disadvantage that the mag
tion but are. stopped in their movement either. by the
nets must be made comparatively; strong because the. load
lifting strip 6, accordingto-FIGS. 1, 2 and 4, or by one
is greatest‘when the armature is in a released position
of thecodebarslZ, according .to FIG. 3; The armature
and thus’ its force of attraction is smallest. ' At. an
3. of therelay is heldinits rest position by a spring14‘. ~
economical construction the attraction force characteristic
The operation of the selector willnow be explained
ought to follow as much as possible the load character
more in detail .with reference. to the. positions shown in
istic. Thepurpose of this invention is to provide a reliable
the drawings. In FIG. 1 the connecting devices are in
construction that ful?lls this requirement. This is sub
their rest position. The magnet 1 is thus demagnetized
stantially achieved in such a way that said armatures are
and its armature 3 is in 21 released position. The lifting
arranged to actuate the contact springs by means of a
rocker 7 abuts against the shaft a and is kept disengaged
knee-joint system which is so constructed that in the
from the code bars 12 by the lifting strip 6. In FIG. 1
released position of an armature it lies in or almost in
its self-locking position. An especially advantageous con
there is shown how the third of the six code bars is moved
so that it has a tooth in front of the arm 15 of the lifting
struction is obtained when the knee~joint consists of a
lifting iron strip, which is connected to the armature and
rocker which arm is turned to the side. The other ?ve
common to the lifting rockers of the armature, and of the
code bars show instead grooves right in front of the arm
lifting rocker selected by the code system.
45 15. If now the magnet 1 is energized, the armature 3
The invention will now be illustrated more in detail
will be actuated and the lifting strip 6 is drawn aside,
with reference to the drawings, in which:
that is, with its upper parts to the left. The lifting rocker
FIG. 1 shows the switching device in its rest or inactive
7 then tries to follow but is stopped because the arm 15
position in which the armature of the device is released.
is caught on the third code bar. Then the position will
FIG. ‘2 shows the armature attracted and the code bars 50 be achieved which is shown in FIG. 3. When hereafter
in a setting different from that of FIG. 1.
the armature is released, the position of FIG. 1 returns.
FIG. 3 shows the armature attracted .and the code bars
If now the code bar 3 is moved so that all code bars
in the same setting as in FIG. 1, and
are situated with their grooves in front of the arm 15
FIG. 4 shows the armature released and the code bars
of the lifting rocker, the position according to FIG. 2 will
in the same setting as in FIG. 2.
be obtained. The lifting rocker 7 follows the lifting
In the drawing only those details which are necessary
strip 6 to a completely swung out position when the
for an understanding of the invention have been shown.
armature 3 is actuated. The lifting strip will then engage
The construction and the operation of the other parts of
a groove 16 in the lower end of the lifting rocker and
the selector may be seen in British Patent 832,865.
forms a knee-joint system with the same. When now the
The selector indicated in the drawing is in conformity 60 armature is released, the lifting rocker follows the lifting
with that shown in the British Patent 832,865 assembled
strip and is lifted upwards, whereby the bar 13 also is
on a mounting plate 2 extending along the length of the
lifted upwardly and the associated contacts of the multi
entire selector. The mounting plate is disposed perpen
ple are actuated. Bar 13 mounts lifting pins 22 coacting
dicularly to the plane of the drawing and mounts a num~
with ganged contact springs 21 to move the same into
ber of connecting relays 1 with the associated armatures 3. 65 engagement with contacts 23 of the multiple. The posi
For each such relay, there is provided a multiple which
tion according to FIG. 4 then has been achieved. A re
is not shown. Each multiple consists of a number of
turn to the position according to FIG. 1, i.eg. from work
wire spring sets situated close to each other and provided
ing position to rest positionptakes place across the posi
with contact springs situated over each other. The
tion according to FIG. 3.
i
I
springs of a group are actuated by means of a lifting bar
From FIG. 4 appears that the lifting bar 13 moves
13 belonging to said group. Below each lifting bar,
slowly in relation to the movement of the armature 3
there is provided an L-shaped rocking arrangement 7
when the bar is in its lifted position, in which the load
3,089,011
4
3
is greatest, that is, all ‘contact springs associated with the
lifting bar are actuated. When the knee-joint system
formed by the lifting rocker 7 and the lifting strip 6 passes
over into the self-locking position shown in FIG. 4, in
release position thereof, said arms locking each other and
the lifting bar in the lifted position of the latter, thereby
forming a knee-joint mechanism.
2. A switching device according to claim 1, wherein
which the rocker 7 and the lifting strip 6 are situated
approximately on a line, the movement of ‘the lifting bar
said ?rst arm and said second arm are engageable with
each other at their respective free ends to effect movement
13 decreases to zero. This means that the attractive force
of the spring 14 may be kept on a low value as Well as
of the ?rst arm by the pivotal movement of the second
arm, said arms and said lifting bar occupying positions
the attraction force of the magnet in the released posi
of substantially perpendicular alignment in said lifted
tion of the armature. Thus a swifter actuation of arma
10 position of the bar, thereby effecting locking of the arms
ture 3 will ‘be achieved and smaller magnets may be used.
and the bar.
3. A switching device according to claim 1, wherein
I claim:
1. A switching device comprising at least a pair of
relatively movable switch contacts, one contact of the
a spring coacts with said armature to urge the same from
moving the same into a lifted position in response to a 20
second arms.
movement of the armature into a position of release from
5. A switching device according to claim 4 and com
prising selecting means including a settable code bar for
an attracted position into the release position.
pair being a spring contact, an actuating magnet including 15 4. A switching ‘device according to claim 1 and com
prising a plurality of pairs of switch contacts in row ar
a movable armature, a lifting bar coacting with said spring
rangement, a second arm being provided for each of said
contact for controlling the switching position thereof by
pairs, said ?rst arm being in the form of a bar extending
the position of lift of the lifting bar, and transmission
lengthwise of said second arms and common to all of the
means coupling said armature with the lifting bar for
the magnet, said bar in its lifted position deflecting the
.
each of the second arms, each of said code bars coacting
spring contact into engagement with the other contact of
with the respective second arm to control the position
said pair, said transmission means including a ?rst arm
mounted pivotally about a stationary pivot point, a sec 25 thereof with reference to the ?rst arm for releasing and
locking, respectively, the second arm for coaction with
ond arm mounted pivotally about a second stationary
pivot point and longitudinally displaceable within pre
the ?rst arm in accordance with the setting of the code
determined limits With reference to its pivot point, said
bars.
second arm coacting with said lifting bar to lift the same
into a predetermined position of displacement with refer 30
ence to its pivot point, said ?rst and second arms co
acting with each other to ‘displace the second arm into
said predetermined position by a pivotal movement of
the ?rst arm, said bar in its lifted position ‘de?ecting the
35
spring contact into engagement with the other contact
of said pair, and a link pivotally coupling the ?rst arm
to the armature to impart to the ?rst arm said pivotal
movement in response to the armature moving into the
References Cited in the ?le of this patent
UNITED STATES PATENTS
675,865
1,050,021
1,543,825
1,563,658
2,490,963
2,714,631
2,784,275
Starr ________________ __ June 4,
Hewlett et a1 ___________ __ Jan. 7,
Dobbin _____________ __ June 30,
Richard ______________ __ Dec. 1,
Hofgaard ____________ .._ Dec. 13,
1901
1913
1925
1925
1949
Unk et al _____________ __ Aug. 2, 1955
Senn ___________ __,_____ Mar. 5, 1957
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